Wyniki wyszukiwania - BazTech

1

Improving the permeability characteristic of nickle oxide/yttria stabilized zirconia anode through thermal decomposition of organic porous support as sustainable material for green hydrogen ecosystem

Febriandyono Muhammad Faesal, Sulistyo, Tauviqirrahman Mohammad, Calista Rayhan, Rahman Reza Abdu

Advances in Science and Technology. Research Journal

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2025

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Vol. 19, no. 4

270--279

EN

Modification of the anode for fuel cell is essential to achieve the effective conversion rate at desired level. It is influenced by the gas distribution during the process. The compact profile of the anode is a direct impact for using sintering as reliable production method, making further material modification is demanded to solve the issue. At this work, practical solution is conducted to maintain the effective gas diffusion for anode, which is achieved through surface decoration enhancement. The study uses organic porous support (PS) as one sustainable and applicable method. The organic PS is made from flour, which evaporates during the sintering process. The diffraction profile for the produced anode indicates no substantial changes in the structural and physical characteristics. The morphology observation implies various models on the pore formation, including an elongated gap, achieved by a higher PS ratio (15 wt%). It promotes the highest permeability up to 0.425 m2, with maximum partial pressure difference only 4.53 kPa. It shows the achievement of surface modification is reliable to provide substantial improvement on the gas distribution throughout the conversion process. Thus, the contribution of this work is possible for applied as reliable method to improve the pores formation.

2

The effect of composition and holding time on glaze production using basalt rock as a base

Birawidha David Candra, Miswanto Agus, Setiawan Liston, Prakosa Agus, Dani Umar, Gunawan Gunawan, Arianti Era, Karo-Karo Pulung, Nugroho Totok, Hendronursito Yusup

Physicochemical Problems of Mineral Processing

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2024

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Vol. 60, iss. 1

art. no. 177640

EN

This research studied the potential use of local basalt and feldspar from Lampung Province, Indonesia, as glaze materials. Frit(s) are composed of changing basalt-to-feldspar weight ratios of A (30:70), B (50:50), C (70:30), and D (100:0) w/w%. The added 20% boric acid to the total weight reduces the process temperature to 1,000oC with holding times of 1, 4, and 8 hr(s). Based on the chemical composition test of the specimen, the four variations of the sample have SiO2 content above 40%, and the average SiO2/Al2O3 ratio is 4 and 5, which is usually a low-alumina glaze that will cause a glossy effect and have an amorphous structure. At point 2theta 29o, amorphous forms. Quartz (SiO2), albite (NaAlSi3O8), anorthite (CaAl2Si2O8), and coesite (SiO2) phases were discovered in the glaze specimens. The anorthite phase in glass-ceramic glaze gives a transparent glaze color due to the amorphous glassy phase formed during heat treatment. The findings of this study suggest that local materials based on basalt and feldspar may be used as glaze materials to provide a smooth texture and surface; the glaze layer is evenly distributed, can follow the full surface contour of the test specimen, and has low porosity.

3

Refractory metals as alloying additives for metallic materials formed via powder metallurgy techniques

Duda Alicja, Kopyciński Bartosz, Matula Grzegorz, Wrona Adriana

Ochrona przed Korozją

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2024

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nr 3

68--76

EN

Methods for the fabrication of metallic sinters via powder metallurgy techniques have been widely discussed in materials engineering for many years. Depending on the final purpose of the finished products, it is primarily important to ensure their appropriate mechanical properties. Numerous works on this topic are devoted mainly to the modification of conventional metallic materials, and one of the promising research directions is the addition of refractory metals to metal alloys. Thanks to the advantageous impact on thermal stability, mechanical properties, and corrosion resistance, the proposed solutions fit perfectly into the trends of searching for new, functional engineering materials. This work presents a review of scientific reports on the modification of metal alloys with the addition of refractory metals published over the last 15 years. First, a brief characterization of refractory metals along with a description of the basics of processing metallic materials using powder metallurgy are presented. In the following part of the article, the research results on the influence of the addition of high-melting metals on the mechanical properties and corrosion resistance of heavy and light metal alloys are discussed. The conclusion consists of data on the global metal alloys market, taking into account its current state and forecasted changes for the next few years.

PL

Metody spieków metalicznych technikami metalurgii proszków są szeroko omawiane w inżynierii materiałowej od wielu lat. Niezależnie od przewidywanego przeznaczenia gotowych wyrobów istotne jest przede wszystkim zapewnienie produktom odpowiednich własności mechanicznych. Liczne prace poświęcone tej tematyce skupiają się głównie na modyfikacji konwencjonalnych materiałów metalicznych, a jednym z obiecujących kierunków badań jest wzbogacanie stopów metali dodatkiem metali wysokotopliwych. Dzięki korzystnemu wpływowi na stabilność termiczną, własności mechaniczne i odporność na korozję proponowane rozwiązania doskonale wpisują się w poszukiwania nowych, funkcjonalnych materiałów inżynierskich. Praca stanowi przegląd doniesień naukowych opublikowanych w ciągu ostatnich 15 lat, traktujących o modyfikacji stopów metali dodatkiem metali wysokotopliwych. W pierwszej kolejności przedstawiono krótką charakterystykę metali wysokotopliwych wraz z omówieniem podstaw przetwarzania materiałów metalicznych z wykorzystaniem metalurgii proszków. W dalszej części artykułu przeprowadzono analizę wyników badań nad wpływem dodatku metali wysokotopliwych na własności mechaniczne oraz odporność korozyjną stopów metali ciężkich i lekkich. W podsumowaniu przybliżono dane dotyczące stanu globalnego rynku stopów metali wraz z uwzględnieniem zmian prognozowanych na najbliższe lata.

4

Effect of U-FAST Technology on Basic Properties of WC-Co Composites Designed for Particleboard Milling Tools

Wachowicz Joanna, Bałaga Zbigniew, Dembiczak Tomasz, Náprstková Nataša, Kuśmierczak Sylvia

Biuletyn Wojskowej Akademii Technicznej

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2024

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Vol. 73, nr 2

9--13

EN

Cemented carbides WC-Co are one of the basic tool materials. They constitute over half of the currently used tools intended for machining. The main advantages of WC-Co cemented carbides are their high hardness and abrasion resistance. The properties of WC-Co sinters depend mainly on the content of the binding phase, the sintering method, and the grain size of the powder from which the sinters were made. The aim of the study was to produce WC-Co nanocomposites using U-FAST (Upgraded Field Assisted Sintering Technology), as well as to examine the basic properties of WC-Co sinters: microstructure, hardness, and phase composition. In the sintering processes carried out, no additives affecting the reduction of grain growth were used. The obtained results were compared with similar sinters produced using SPS (Spark Plasma Sintering) technology.

PL

Węgliki spiekane WC-Co są jednym z podstawowych materiałów narzędziowych. Stanowią ponad połowę obecnie stosowanych narzędzi przeznaczonych do obróbki skrawaniem. Głównymi zaletami węglików spiekanych WC-Co są wysoka twardość i odporność na ścieranie. Właściwości spieków WC-Co zależą głównie od zawartości fazy wiążącej, metody spiekania i wielkości ziarna proszku, z którego wykonano spieki. Celem badań było wytworzenie nanokompozytów WC-Co przy użyciu technologii U-FAST (Upgraded Field Assisted Sintering Technology), a także zbadanie podstawowych właściwości spieków WC-Co: mikrostruktury, twardości, składu fazowego. W przeprowadzonych procesach spiekania nie stosowano dodatków wpływających na ograniczenie rozrostu ziarna.

5

Sinterability, Microstructural Evolution, and Dielectric Performance of Bismuth Sodium Titanate (Bi0.5Na0.5TiO3) Lead-Free Ferroelectric Ceramics

Takiul Islam, Lee Sanghaw, Hwang Haejin

Archives of Metallurgy and Materials

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2024

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Vol. 69, iss. 1

33--38

EN

In this study, lead-free bismuth sodium titanate (BNT; Bi0.5Na0.5TiO3) powder was synthesized using wet precipitation. The sintering behavior and dielectric properties of the BNT ceramics were investigated in terms of the sintering temperature. Titanium isopropoxide, sodium nitrate, and bismuth nitrate were used as starting materials. A titanium peroxo complex (TPC) solution was synthesized using titanium hydroxide, nitric acid, and hydrogen peroxide. A clear Bi-Na-Ti precursor solution was obtained by mixing the TPC, sodium, and bismuth nitrate solutions. The pH of the precursor solution was increased to 9 using NaOH and a white powder was precipitated. A spherical and pyrochlore phase-free BNT powders were obtained by calcining the white precipitate above 600°C for 3 h. Particle size analysis and SEM observations revealed that the BNT powder calcined at 700°C exhibited homogeneous distribution with particle size less than 300 nm. The sinterability of the BNT ceramic prepared through wet precipitation was significantly enhanced compared to that of the BNT powder prepared via the solid-state reaction of sodium carbonate, bismuth oxide, and titanium oxide powders.

6

Fabrication of Porous Sintered Body using Shape-Controled 316l Stainless Steel Powder by High-Energy Ball Milling

Kim Woo Cheol, Byun Jongmin

Archives of Metallurgy and Materials

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2024

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Vol. 69, iss. 1

109--112

EN

In this study, 316L stainless steel powder was used to produce a porous body that could be used in a specific environment. In contrast to the existing method of producing filters using only spherical powders, we attempted to produce filters using plate- and needle-like powders and evaluated their performance. In the powder preparation step, the shape change of the powder was analyzed by changing the size of the stainless-steel balls used for ball milling. Then, the variations in properties of the sintered porous body caused by the ball size were investigated. As the average ball size decreased, the average particle size of the powder decreased. Moreover, the surface area and pore size of the porous body decreased. Additionally, when balls of different sizes were mixed, the porous body showed a mixture of coarse and fine pores.

7

Badania nad przygotowaniem nowego ekologicznego granulatu ceramicznego dla budownictwa

Wang Yifei

Przemysł Chemiczny

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2023

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T. 102, nr 8

795--798

PL

Poferment z fermentacji biomasy (DR) i popiół lotny (FA) zmieszano z biowęglem z osadów ściekowych (SSC) w stosunku 10:10:80 i spiekano w temp. 1050°C. Produkt został zgranulowany z przeznaczeniem na materiały budowlane i przetestowany zgodnie z chińskimi normami krajowymi. Wszystkie wskaźniki jakości granulatu spełniły wymagania chińskich norm krajowych dla granulatu budowlanego. Wskaźnik potencjalnego ryzyka ekologicznego związanego z obecnością metali ciężkich był niski, a produkt był bezpieczny.

EN

Biomass fermentation digestate and fly ash were mixed with sludge biochar in the ratio of 10:10:80 and sintered at 1050°C. The product was pelletized to building materials and tested according to China national stds. All the qual. indicators of the pellets met the requirements of the China national stds. for construction pellets. The potential ecol. risk index of heavy metals was low, and the product was safe.

8

Phase transformations in Ni-rich additively manufactured NiTi alloys

Ratajski Jerzy, Bałasz B., Mydłowska K., Pancielejko Mieczysław, Laskowska D., Szparaga Łukasz

Journal of Achievements in Materials and Manufacturing Engineering

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2023

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Vol. 121, nr 1

118--130

EN

The objective of the research outlined in the article was to evaluate the conventional parameter known as volumetric energy density (VED), which serves as the primary indicator determining the quality of products manufactured using the additive technique with the Selective Laser Sintering (SLS) method. An independent goal was to examine the impact of secondary phase precipitates (Ni4Ti3) on the temperature ranges of phase transformations in nickel-rich NiTi alloys. Design/methodology/approach The assessment of Volumetric Energy Density (VED), was conducted based on the measurement of sample density, analysis of phase transformation sequences determined by scanning differential calorimetry (DSC), and phase composition determined by X-ray diffraction (XRD). VED was calculated based on laser power, scanning speed, hatch spacing, and single-layer thickness in the study on the influence of secondary phase precipitates (Ni4Ti3), formed during the ageing of the samples at 500°C for 20 and 100 hours, on the sequence of phase transformations, as well as the initiation and completion temperatures of martensitic (Ms, Mf) and austenitic (As, Af) transformations, scanning differential calorimetry (DSC) and X-ray diffraction (XRD) were employed. Findings It has been demonstrated that the value of Volumetric Energy Density (VED) is not a decisive parameter for the quality of the result. The primary influences on the quality of samples after the SLS process were found to be the laser energy and hatching space values. By varying the ageing time at a temperature of 500°C for NiTi alloy samples with excess nickel content (51.7 at.%), it is possible to influence the temperature of thermoelastic martensitic transformation effectively. This allows for utilising its unique functional properties for various advanced applications. Research limitations/implications The absolute condition for determining the temperature and post-processing time, which dictates specific phase transformation temperatures in NiTi alloys produced by additive techniques (SLS), is the selection of process parameters. The parameters include laser power and hatch spacing, ensuring an appropriate scanning speed and layer thickness. The factors guarantee certain product properties characterised by specific density and direct austenite-to-martensite transformation occurring during the cooling of samples. Practical implications Influencing the Ni/Ti ratio and microstructure of NiTi alloy through appropriate post-processing allows for the utilisation of its functional features, such as the shape memory effect combined with superelasticity, for advanced applications. Originality/value Based on the conducted research, it has been demonstrated that the quality of the product after the SLS process primarily depends on laser power and hatch spacing. It has also been shown that, for precise tuning of phase transformation temperatures in additively manufactured NiTi alloys, the selection of post-processing parameters is essential and is influenced by the initial composition of the powder used.

9

Effect of sintering temperature and isostatic pressure on selected properties of selected electrical contact materials manufactured by hot isostatic pressing

Kołacz Dariusz, Kulasa Joanna, Krukowski Karol, Hury Anna, Muzia Grzegorz, Osadnik Małgorzata, Kalabis Jarosław

Composites Theory and Practice

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2023

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R. 23, nr 2

67--75

EN

This paper presents the results of studies on the consolidation of metallic and composite powders by the hot isostaticpressing (HIP) process intended for electrical contact materials. Ag, Cu metallic powders, as well as AgW48Re2, AgRe1 and CuW47Re3 composite powders were used in the investigations. Green compacts for consolidation and hot sintering under pressure were prepared by double-sided axial pressing in steel dies. The density, electrical conductivity, and hardness were measured on the obtained sinters after the HIP process, and the microstructure was examined on selected ones. The research indicates that applying this technology allows good quality electrical material to be obtained, intended for electrical contact material.

10

Influence of Sintering Temperature on the Pore Structure of an Alkali-Activated Kaolin Based Geopolymer

Ramli Mohd Izrul Izwan, Salleh Mohd Arif Anuar Mohd, Aziz Ikmal Hakem, Zaimi Nur Syahirah Mohamad, Amli Siti Farahnabilah Muhd, Abdullah Mohd Mustafa Al Bakri

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 3

987-989

EN

Kaolin-based geopolymers are alternatives for producing high-strength ceramics for construction materials. Creating high-performing kaolin ceramics utilizing the regular technique requires a high handling temperature (higher than 1200°C). Thus, the structure and properties such as pore size and distribution are affected at higher sintering temperatures. Along these lines, information with respect to the sintering system and related pore structure is essential for advancing the properties of the previously mentioned materials. This study investigated the microstructure and the density of a kaolin-based geopolymer at various sintering temperatures. The unsintered sample has the highest density of 1610 kg/cm3 , while the samples sintered at 1100°C haves the lowest density of 1203 kg/cm3 . The result also shows that increasing the sintering temperature to 1100°C resulted in increasing the water absorption of the kaolin-based geopolymer ceramic.

11

Influence of Dissolved Oxygen Content on the Properties of Aqueous Milled WC-Co Powders

Chicinas Horea F., Marton Leó-Ede, Popa Catalin O.

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 3

1205--1210

EN

The research aims to develop a novel and safer milling route to produce Hard Metals. Considering the risks associated with milling fine particles under organic solvents, especially the increased fire and explosion risks, we propose milling under aqueous milling media to diminish the risks associated with fire hazards, while maintaining the oxidation level at a minimum. The samples were sintered in an industrial sintering oven under vacuum at 1380°C subsequent to milling and drying. The characterisation of the materials has been done by X-ray diffraction, scanning electron microscopy, particle size analysis, optical microscopy, and a magnetometer. The obtained results indicate that appropriate properties of the powders after milling and drying as well as the desired biphasic (Co-WC) phases were obtained after sintering, thus proving the feasibility of such a route and diminishing specific fire hazards.

12

Effect of calcite and mica contents in nepheline syenite samples on the ceramic body sintering behaviours and surface roughness

Durgut Emrah, Cinar Mustafa, Ozdemir Orhan

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 5

art. no. 149179

EN

In this study, the effects of calcite and mica contents in nepheline syenite (NS) samples beneficiated by high intensity dry magnetic separation and flotation methods on ceramic bodies were investigated in detail. The NS samples were, first, sintered to observe the physical and surface roughness properties, and characterized based on the change of NS samples such as color, shrinkage, water absorption, and surface roughness after the sintering process. L-a-b color and Ra, Rz, Rt values for the NS samples were determined. The decrease in calcite and mica contents affected the surface of sintered specimens positively by reducing roughness values. Additionally, the water absorption values were found to be directly proportional to Ra values for unglazed surfaces. In conclusion, calcite and mica minerals in NS samples negatively affected surface quality by forming pinholes due to dehydroxylation and outgassing reactions in the sintering process.

13

Influence of HIP sintering technique on the reliability of the mechanical properties of brass-an experimental study

Alnomani Salah N.

Diagnostyka

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2022

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Vol. 23, No. 3

art. no 2022311

EN

The reliability of the mechanical properties of any product plays an important role in the longevity of the product to work properly under various working conditions. In the present study, the effect of preparing brass alloy on its mechanical properties was experimentally studied. Samples of brass (60% Cu-40% Zn) were prepared by hot iso-stating pressing (HIP) sintering method and some main mechanical tests were performed on them included porosity, density, hardness and compression tests. Results of these tests were compared with corresponding tests on commercial brass alloys produced by casting in order to show the effect of the method of preparing on their mechanical properties. There was a significant improvement in the hardness and strength of the sintered alloy due to the increasing in density and decreasing in porosity comparing with the corresponding other casting's alloys. Results showed an improvement in the density values by 8.4% as a result of the significant reduction in the porosity values from 8.65% to about 0.43%. As a result, the strength of the alloys prepared by the heat pressing method has jumped to a value of 600MPa compared to the traditional castings that have a strength of 343MPa.

14

Consolidation and Characterisation of Hard Metal Powders Milled under Dichloromethane

Chicinaș Horea, Jucan Ovidiu-Darius, Gădălean Rares Vasile, Conțiu Glad, Cotai Ana, Popa Catalin

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 2

541--545

EN

This work presents the development of a safer processing route for hard metals. Traditional processing of fine particles under organic solvents presents significant explosion risks. The milling under dichloromethane (DCM) reduces the risks associated with fire hazards. After milling and drying, the samples have been sintered in an industrial sintering furnace under a vacuum at 1380°C. The materials’ characterisation has been done by X-ray diffraction, scanning electron microscopy, particle size analysis, optical microscopy, and by magnetic measurements. The present work results reveal the powders’ appropriate properties after milling and drying and the desired biphasic (Co-WC) phases obtained after sintering, thus proving the feasibility of such a route, therefore the diminishing of specific fire hazards.

15

Wykorzystanie rentgenowskiej analizy dyfrakcyjnej do oceny stałości składu zestawu surowcowego do syntezy C3S

Ciołek Lidia, Gąsiński Arkadiusz

Szkło i Ceramika

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2021

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R. 72, nr 1

38--40

PL

W pracy przedstawiono badania odpowiednie do wytworzenia głównego składnika cementu portlandzkiego − krzemianu trójwapnia. Przeprowadzone badania obejmowały ujednorodnienie zestawu, ocenę stałości jego składu z wykorzystaniem rentgenowskiej analizy fazowej w połączeniu z metodą Rietvelda oraz wyniki XRD wytworzonego spieku. Zaprezentowane wyniki potwierdzają adekwatność przyjętych metod badawczych do wytworzenia jednorodnego spieku zawierającego alit (krzemian trójwapnia).

EN

The paper presents tests suitable for the production of the main component of Portland cement - tricalcium silicate. The tests carried out included homogenization of the batch of raw material sets, assessment of the constancy of its composition with the use of X-ray phase analysis in conjunction with the analysis of the results using the Rietveld method, and the XRD results of the sinter produced. The presented results confirm the adequacy of the adopted research methods for the production of a homogeneous sintered alite (tricalcium silicate).

16

Nowa metoda wtryskowego formowania szkła jak polimerów

Ż. E.

Szkło i Ceramika

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2021

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R. 72, nr 2

71--72

17

Study on removal of copper, tin and arsenic from iron ore, scrap and steel in the light of the latest state of metallurgical technology

Zdonek Bogdan, Różański Piotr, Borecki Mariusz, Stecko Janusz, Szypuła Ireneusz

Journal of Metallic Materials

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2021

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Vol. 73, no. 1

16--21

EN

The study investigates the ability to remove copper, tin and arsenic from iron ore, scrap and liquid steel based on the literature and thermodynamic calculations using the FactSage 7.2 software. Methods of removing Cu, Sn and As from iron-bearing materials, feasible in industrial conditions in the near term, were selected. Simulation tests with the use of the FactSage 7.2 software showed that under reduced pressure conditions Cu and Sn can be removed from the steel bath, while As evaporation is not possible. Laboratory tests were carried out, including the removal of Sn and Cu in the process of degassing of liquid steel in a deep vacuum in a vacuum induction furnace and the removal of Sn from iron ore in the sintering process. Under conditions of deep vacuum (below 40 Pa), high temperature (1670°C) and a correspondingly long vacuum treatment time (over 30 minutes), the efficiency of removing the copper and tin contents from the liquid steel of approximately 14 and 17% respectively was obtained. The iron ore sintering test with a high Sn content showed the effectiveness of reducing the Sn content during this process, amounting to approx. 30%.

PL

Zbadano możliwości usuwania miedzi, cyny i arsenu z rudy żelaza, złomu i ciekłej stali na podstawie literatury oraz termodynamicznych obliczeń za pomocą oprogramowania FactSage 7.2. Wybrano sposoby usuwania Cu, Sn i As z materiałów żelazonośnych możliwe do realizacji w warunkach przemysłowych w najbliższej perspektywie czasowej. Badania symulacyjne z zastosowaniem oprogramowania FactSage 7.2 wykazały, że w warunkach obniżonego ciśnienia można usunąć Cu i Sn z kąpieli stalowej, natomiast nie jest możliwe odparowanie As. Przeprowadzono próby laboratoryjne, obejmujące usuwanie Sn i Cu w procesie odgazowania ciekłej stali w głębokiej próżni w próżniowym piecu indukcyjnym oraz usuwanie Sn z rudy żelaza w procesie spiekania. W warunkach głębokiej próżni (poniżej 40 Pa), wysokiej temperatury (1670°C) i odpowiednio długiego czasu obróbki próżniowej (powyżej 30 minut) uzyskano skuteczności usunięcia zawartości miedzi i cyny w ciekłej stali, wynoszące odpowiednio około 14 i 17%. Próba spiekania rudy żelaza z wysoką zawartością Sn wykazała skuteczność zmniejszenia zawartości Sn w czasie tego procesu, wynoszącą ok. 30%.

18

Synthesis and Dielectric Properties of Nd Doped Bi5Ti3FeO15 Ceramics

Kocoń N., Dzik Jolanta, Szalbot Diana, Pikula Tomasz, Adamczyk-Habrajska Małgorzata, Wodecka-Duś Beata

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 2

359--365

EN

Aurivillius Bi5Ti3Feo15 (BTF) and Bi5-xNdxTi3Feo15 (BNTF) ceramics were successfully synthesized by a simple solid state reaction method. Ceramics were prepared from simple oxide powders Bi2O3, TiO2, Nd2O3 and Fe2O3. The microstructure, structure, chemical composition and dielectric properties of the obtained materials were examined. Dielectric properties were investigated in a wide range of temperatures (T = 25ºC-550ºC) and frequencies (20Hz-1MHz).

19

Effects of ZrO2 and Al2O3 Addition on the Physical Properties of Cu-Mo-Cr Alloy by Liquid Phase Sintering

Cho Yeong-Woo, Sim Jae-Jin, Heo Sung-Gue, Kim Hyun-Chul, Lee Yong-Kwan, Byeon Jong-Soo, Lee Yong-Tak, Lee Kee-Ahn, Seo Seok-Jun, Park Kyoung-Tae

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 3

683--687

EN

In this study, the effect of the addition of ZrO2 and Al2O3 ceramic powders to Cu-Mo-Cr alloy was studied by examining the physical properties of the composite material. The ceramic additives were selected based on the thermodynamic stability calculation of the Cu-Mo-Cr alloys. Elemental powders, in the ratio Cu:Mo:Cr = 60:30:10 (wt.%), and approximately 0-1.2 wt.% of ZrO2 and Al2O3 were mixed, and a green compact was formed by pressing the mixture under 186 MPa pressure and sintering at 1250°C for 5 h. The raw powders were evenly dispersed in the mixed powder, as observed by scanning electron microscopy. After sintering, the microstructures, densities, electrical conductivities, and hardness of the composites were evaluated. We found that the addition of ZrO2 and Al2O3 increased the hardness and decreased the electrical conductivity and density of the composites.

20

Simulation and Analysis of Sintering Furnace Temperature Based on Fuzzy Neural Network Control

Chaoxin Zou, Rong Li, Zhiping Xie, Ming Su, Jingshi Zeng, Xu Ji, Xiaoli Ye, Ye Wang

Archives of Foundry Engineering

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2021

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Vol. 21, iss. 1

23--30

EN

Aiming at the problems of delay and couple in the sintering temperature control system of lithium batteries, a fuzzy neural network controller that can solve complex nonlinear temperature control is designed in this paper. The influence of heating voltage, air inlet speed and air inlet volume on the control of temperature of lithium battery sintering is analyzed, and a fuzzy control system by using MATLAB toolbox is established. And on this basis, a fuzzy neural network controller is designed, and then a PID control system and a fuzzy neural network control system are established through SIMULINK. The simulation shows that the response time of the fuzzy neural network control system compared with the PID control system is shortened by 24s, the system stability adjustment time is shortened by 160s, and the maximum overshoot is reduced by 6.1%. The research results show that the fuzzy neural network control system can not only realize the adjustment of lithium battery sintering temperature control faster, but also has strong adaptability, fault tolerance and anti-interference ability.