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1

The influence of carbide reinforcement on the properties of sintered aluminium alloy matrix composites

Szewczyk-Nykiel Aneta

Technical Transactions

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2023

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Vol. 120, iss. 1

art. no. e2023005

EN

Based on the commercial aluminium alloy powder blend (Alumix 431D) metal matrix composites reinforced with particles of SiC as well as TiC were produced by conventional powder metallurgy technology and the effect of the type and amounts of reinforced particles on the selected properties and microstructure of sintered composites were investigated. In particular, the densification behaviour, the wear resistance and the corrosion resistance in 3.5% NaCl solution were identified. It was stated that both the type and the weight fraction of carbide used as particulate reinforcement have a great impact on the properties of aluminium alloy matrix composites. It was shown that the introduction of titanium carbide has a more favourable effect on the properties of sintered Alumix 431D matrix composites in comparison to silicon carbide and the optimum content of TiC in composite is 4 wt. % due to the highest hardness, wear resistance (wear rate of 2.865·10 ̄ ³ mm³/m) and simultaneously the best corrosion resistance (corrosion rate of 0.005 mm/year).

2

Opracowanie wysokosprawnego dwukierunkowego przekształtnika sieciowego przeznaczonego do pracy w mikrosieci prądu stałego

Koszel Mikołaj, Grzejszczak Piotr, Wolski Kornel, Święchowicz Tomasz, Nowatkiewicz Bartosz

Przegląd Elektrotechniczny

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2023

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R. 99, nr 7

152--157

PL

Tematem artykułu jest projekt i badania prototypu dwupoziomowego trójfazowego przekształtnika sieciowego o mocy znamionowej 15 kW i napięciu w obwodzie DC na poziomie 760V. Za cel postawiono weryfikację algorytmu sterowania dwupoziomowego przekształtnika AC/DC w układzie eksperymentalnym. Algorytm umożliwia zastosowanie przekształtnika w mikrosieci prądu stałego. Zastosowany w układzie wydajny sterownik hybrydowy umożliwia zastosowanie zaawansowanego algorytmu sterowania. Badany przekształtnik oraz zastosowany algorytm sterowania pozwala na bezpośrednią regulację mocy czynnej i biernej w pracy dwukierunkowej. Odporność na odkształcenia napięcia sieci oraz zmiany jego częstotliwość uzyskana została przez moduł synchronizacji z siecią (DSOGI-PLL). W pracy zaprezentowano wyniki badań symulacyjnych i eksperymentalnych.

EN

The subject of the article is the design of a prototype of a two-level three-phase grid converter with a rated power of 15 kW and a DC voltage of 760V. The goal was to verify the control algorithm of the two-level AC/DC converter in the experimental system. The algorithm enables the use of the converter in a DC microgrid. The efficient hybrid controller used in the system enables the use of an advanced control algorithm. The tested converter and the control algorithm used allow for direct control of active and reactive power in bidirectional operation. Immunity to voltage distortion and changes in its frequency was obtained by the synchronization module with the network (DSOGI-PLL). The paper presents the results of simulation and experimental studies.

3

Badanie własności grubowarstwowego kontaktu srebro-węglik krzemu modyfikowanego wiązką laserową

Woźny Janusz, Kubiak Andrzej

Przegląd Elektrotechniczny

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2022

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R. 98, nr 1

169--172

PL

W pracy zaprezentowana jest metoda uzyskiwania kontaktów omowych do węglika krzemu z wykorzystaniem srebrowego kleju przewodzącego oraz lasera modyfikującego obszar kontaktu. Metoda nie wymaga przeprowadzania procesu wygrzewania całej struktury. Może ona znaleźć zastosowanie w pracach laboratoryjnych nad SiC wymagających szybkiego wytworzenia kontaktów omowych do struktur z SiC.

EN

The paper presents a method of obtaining ohmic contacts to silicon carbide with the use of a silver conductive adhesive and a laser beam modifying the contact area. The method does not require the whole structure annealing process. It can be used in laboratory work on SiC requiring rapid creation of ohmic contacts to SiC structures.

4

Various Aspects of Application of Silicon Carbide in the Process of Cast Iron Melting

Janerka Krzysztof, Kostrzewski Łukasz, Stawarz Marcin, Jezierski Jan, Szajnar Jan

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 3

1093--1098

EN

The article discusses benefits associated with the use of silicon carbide in the process of melting gray cast iron and ductile cast iron in induction electric furnaces. It presents the analysis of the impact of various charge materials and the addition of a variable amount of SiC and FeSi to the fixed charge when melting cast iron of grades GJS 400-15 and GJS 500-7 on mechanical properties and microstructure. Moreover, the article includes an analysis of the efficiency of carburization and the increase in the content of silicon during the application of SiC. The article also presents the results of the study of primary modification using silicon carbide at the minimum temperature of Temin eutectic and Tsol solidus. Based on analysis of the literature, conducted research, and calculations, it was found that the addition of silicon carbide has a beneficial impact on the properties of melted cast iron. The addition of SiC in the charge increases the content of C and Si without increasing the amount of contaminations. The addition of SiC at reduced pig iron presence in the charge decreases production costs, while the use of SiC as an inoculant increases both Temin and Tsol, which is beneficial from the point of view of cast iron nucleation.

5

Optimization of micromachining operation for particle reinforced UHMWPE composites

Sofuoğlu Mehmet Alper, Gürgen Selim

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 3

art. no. e138

EN

Unlike metals, polymers are highly affected by the heat generation during the machining of the workpiece, because the thermal conductivity of polymers are considerably lower than metals, and therefore heat is much more effective in the cutting zone. If the appropriate cutting parameters are not selected, the polymers become excessively deformed and the final part has high surface roughness, dimensionally large burr formation, or dimensional deviations. Machining of polymers ultra-high molecular weight polyethylene (UHMWPE) is quite common in industrial applications. In this study, the effect of SiC fillers on the machinability of UHMWPE polymer composite was investigated. First, different samples were produced using different filler sizes (1 μm, 50 μm, and 100 μm) and different filler amounts (1%, 3%, 5%). Micro-milling tests were carried out at a constant feed rate (70 mm/min), constant cutting depth (0.1 mm) and spindle speeds (1200, 2800, and 4400 rpm). Tool overhang lengths were selected as 10, 15, and 20 mm. During the experiments, the surface/burr shapes, cutting temperatures and cutting forces were observed. In general, it is observed that SiC filler reduces cutting forces and cutting temperatures. In the further stage of the study, Taguchi analysis was performed in the light of different SiC filler sizes, filler amounts, rotational speeds, and tool overhang lengths.

6

Koordynacja przydziału zasobów radiowych w systemach 5G z transmisją dupleksową z podziałem czasu

Łukowa Anna Maria

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2021

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nr 4

106--112

PL

Opisano część badań zawartych w pracy doktorskiej autorki pt.: Coordinated Radio Resource Management in 5G Systems with Time Division Duplex. Przedstawiono algorytmy umożliwiające koordynację interferencji w sieci komórkowej. W szczególności opisano zaproponowane algorytmy skoordynowanego przydziału zasobów radiowych, jak również międzykomórkowej koordynacji parametrów transmisji, takich jak liczba strumieni danych MIMO oraz schematu modulacji i kodowania, które dodatkowo wspomagają efektywność odbiorników SIC. Ponadto rozwiązano ważny problem złożoności koordynacji transmisji w systemie wielokomórkowym.

EN

This article describes some of the research included in the doctoral dissertation of the author of Coordinated Radio Resource Management in 5G Systems with Time Division Duplex. The article presents the algorithms that allow for the coordination of interference in the cellular network. In particular, the proposed algorithms for the coordinated allocation of radio resources as well as the intercellular coordination of transmission parameters such as the number of MIMO data streams and the modulation and coding scheme, which further support the efficiency of the SIC receivers, have been described. Moreover, the important problem of the complexity of transmission coordination in a multi-cell system is also solved.

7

Wpływ procesów utleniania i wygrzewania w atmosferze zawieraj ˛acej fosfor lub azot na jakos´c mi ˛ ´ edzypowierzchni dielektryk/półprzewodnik w strukturze MOS Ti/SiO2/4H-SiC

Kamiński Maciej, Brzozowski Ernest, Taube Andrzej, Sadowski Oskar, Król Krystian, Guziewicz Marek

Przegląd Elektrotechniczny

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2021

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R. 97, nr 2

99--104

PL

W artykule przedstawiono wyniki prac nad formowaniem tlenku termicznego na powierzchni w ˛eglika krzemu oraz wpływ wygrzewania w atmosferze zawieraj ˛acej fosfor lub azot na jakos´c mi ˛ ´ edzypowierzchni dielektryk/półprzewodnik/ w układzie SiO2/4H-SiC. Stwierdzono, ze wygrzewanie ˙ dwuetapowe w atmosferze POCl3 w temperaturze 1000°C, oraz kolejno NO w temperaturze 1100°C pozwala zredukowac g˛ ´ estos´c stanów pułapkowych ´ do poziomu ok. 2×1011 cm−2 przy kraw ˛edzi pasma przewodnictwa.

EN

The aim of this studies was investigation of the influence of oxidation and annealing processes in the phosphorus or nitrogen containing atmosphere on the quality of the dielectric/semiconductor interface in the Ti/SiO2/4H-SiC metal-oxide-semicondutor structure. It was found that twostage annealing, in POCl3-containing atmosphere at the temperature of 1000°C, and successively in NO-containing atmosphere at the temperature of 1100°C allows to reduce the density of interface trap to the level of approx. 2×1011cm−2 near the conduction band edge.

8

Ocena dokładności firmowych modeli tranzystorów SiC-MOS

Bisewski Damian, Lubicz-Krośnicka Emilia

Przegląd Elektrotechniczny

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2021

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R. 97, nr 12

187--190

PL

Praca dotyczy problematyki modelowania charakterystyk oraz parametrów tranzystorów MOS mocy wykonanych z węglika krzemu. Przedstawiono aktualny status komercyjny tranzystorów SiC-MOS oraz informacje w zakresie dostępności modeli firmowych rozważanych przyrządów półprzewodnikowych. Zaprezentowano budowę oraz zasadę działania modeli oferowanych przez wybranych producentów tranzystorów SiC-MOS. Przedstawiono wyniki oceny dokładności tych modeli poprzez porównanie wyników symulacji oraz charakterystyk katalogowych.

EN

The paper concerns on modelling of the characteristics and parameters of power MOSFETs made of silicon carbide. The current commercial status of SiC-MOSFETs and information on the availability of manufacturers models of considered transistors have been discussed. The structure and principle of operation of the models offered by selected manufacturers of SiC-MOSFETs have been presented. An evaluation of accuracy of these models have been presented by comparing the simulation results and catalogue characteristics.

9

TiAl-based Ohmic Contacts to p-type 4H-SiC

Martychowiec Agnieszka, Kwietniewski Norbert, Kondracka Kinga, Werbowy Aleksander, Sochacki Mariusz

International Journal of Electronics and Telecommunications

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2021

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Vol. 67, No. 3

459--463

EN

This paper describes successfully formed ohmic contacts to p-type 4H-SiC based on titanium-aluminum alloys. Four different metallization structures were examined, varying in aluminum layer thickness (25, 50, 75, 100 nm) and with constant thickness of the titanium layer (50 nm). Structures were annealed within the temperature range of 800°C - 1100°C and then electrically characterized. The best electrical parameters and linear, ohmic character of contacts demonstrated structures with Al layer thickness equal or greater than that of Ti layer and annealed at temperatures of 1000°C or higher.

10

Effect of tungsten carbide on Al6061/SiC hybrid metal matrix composites

Vijay P, Brahma Raju K.V., Ramji K., Kamaluddin S

Composites Theory and Practice

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2021

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R. 21, nr 4

169--180

EN

Aluminium matrix composites (AMC) are mostly preferred for their high specific strength, high ductility, corrosion resistance and creep resistance. Various experimental investigations are conducted in the field of AMCs, which are widely applicable in several fields like aerospace (especially aircraft structures and fittings), marine fittings, automotive industries (connecting rods, pistons, brake rotors, and engine blocks), etc. The current work presents the effect of a tungsten carbide (WC) reinforced Al6061/SiC hybrid composites. In this study, the WC particle (3÷5 μm) content is varied from 0 to 6 wt.% in steps of 2 wt.%, while keeping the SiC particle (63 μm) content of 5 wt.% constant. The stir casting method was used to prepare these composites and the behaviour of the composites was studied to ascertain their mechanical and corrosion properties. From the obtained results, it was observed that the ultimate tensile strength, hardness, and corrosion resistance of the composites are enhanced by increasing the content of WC, whereas the wear loss (microns) decreased as the WC was increased up to 4 wt.%; later it increased drastically at 6 wt.% WC. The corrosion results reveal that the corrosion rate of the composites is lower than that of the monolithic alloy. SEM examination of the tensile fracture surface shows that there is a formation of larger shear lips in the base alloy and the composite with 5 wt.% SiC; however, they are reduced gradually by the additions of WC to the composite. The microstructure of the corroded surfaces reveals that the pit density was reduced for the composite with 6 wt.% WC compared to the other composites.

11

Multiparameter reliability model for SiC power MOSFET subjected to repetitive thermomechanical load

Bąba Sebastian

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 3

art. no. e137386

EN

The main drawback of any Design for Reliability methodology is lack of easy accessible reliability models, prepared individually for each critical component. In this paper, a reliability model for SiC power MOSFET in SOT – 227 B housing, subjected to power cycling, is presented. Discussion covers preparation of Accelerated Lifetime Test required to develop such reliability model, analysis of semiconductor degradation progress, samples post-failure analysis and identification of reliability model parameters. Such model may be further used for failure prognostics or useful lifetime estimation of High Performance Power Supplies.

12

Influence of nano TiO2/Micro (SiC/B4C) Reinforcement on the Mechanical, Wear and Corrosion Behaviour of A356 Metal Matrix Composite

Paulraj D., Jeyakumar Palanisamy D., Rajamurugan G., Krishnasamy Prabu

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 3

871--880

EN

This work investigates the distribution and the effect of synthesized nano TiO2, micro SiC and B4C particle on the aluminium (A356) metal matrix composites (AMMC). The consequences of this reinforcement on the mechanical, tribology and corrosion behaviour of the AMMC matrix are analyzed. The nano TiO2 is synthesized by wet chemistry sol-gel process, and the reinforcements are added with A-356 by stir casting method. The ASTM standard test specimens are characterized through mechanical, tribology, and corrosion tests for identifying their properties. The metallurgical characterization has been deliberated through XRD and SEM with EDS. in the tensile test results, the percentage of elongation is dropped drastically by 73% due to the enhanced volume % of nano TiO2, micro SiC, and B4C particles. The particle addition of the wear rate and weight loss are reduced at different volume percentages of the A356 matrix. The time plays a significant role in the corrosion rate. The test results also confirm that the corrosion rate is comparatively minimum in 24 hrs (592.35 mm/yr) duration than the 48 hrs (646.368 mm/yr) in both the solutions.

13

Porównanie falowników klasy DE z pasma 13,56 MHz zbudowanych na tranzystorach SiC MOSFET i GaN FET

Przybyła Krzysztof, Kasprzak Marcin

Przegląd Elektrotechniczny

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2020

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R. 96, nr 7

68--71

PL

W artykule przedstawiono wyniki pomiarów sprawności czterech falowników o mocy wyjściowej do 450W, dwóch zbudowanych na tranzystorach SiC a dwóch na GaN. Tranzystory mają klasę napięciową (650 – 900)V, prądową (20-30)A, obudowy przewlekane (TO-220, TO-247) i SMD (np. D2PAK-7). Badania wykazały, że tranzystory GaN pozwalają na uzyskanie sprawności całkowitej (89-92)% natomiast tranzystory SiC sprawności (70-80)%. Uzyskane sprawności falowników z tranzystorami GaN są wyższe niż podobnych falowników z najlepszymi Si RF MOSFET.

EN

Efficiency measurement results of the four inverters with output power up to 450W, built with SiC (2x) and GaN (2x) transistors are presented in the paper. Used transistors were in (650-900)V voltage class, (20-30)A current class, (TO-220, TO-247) THT cases and (e.g. D2PAK-7) SMD cases. The research has shown that GaN and SiC transistors allow to obtain total efficiency of (89-92)% and (70-80)% respectively. The obtained efficiency results of the inverters with GaN transistors are higher than similar inverters with the best Si RF MOSFETs.

14

Preparatyka próbek materiałów ogniotrwałych zawierających SiC do ilościowej analizy chemicznej metodą XRF

Gerle Anna, Stec Katarzyna, Burdyl Mirosław

Materiały Ceramiczne

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2020

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T. 72, nr 1

s. 56--66

PL

W pracy zaproponowano metodę przygotowywania topionych pereł do analizy chemicznej metodą XRF dla materiałów ogniotrwałych zawierających węglik krzemu. Opracowana metoda utleniania SiC zawartego w próbce za pomocą mieszaniny węglanu sodu i boraksu pozwala na uzyskanie stopu bez zniszczenia platynowych tygli. Z tak otrzymanego stopu przygotowuje się perły litowo-boranowe odpowiednie do analizy chemicznej metodą XRF. Poprawność uzyskiwanych wyników potwierdzono, wykonując analizy certyfikowanych materiałów odniesienia zawierających SiC.

EN

This paper proposes a method for the preparation of fused beads for chemical analysis using the XRF method for refractory materials containing silicon carbide. The developed method of oxidizing SiC contained in the sample with a mixture of sodium carbonate and borax allows to obtain an alloy without destroying the platinum crucibles. From the alloy thus obtained lithium-borate beads suitable for chemical analysis by XRF are prepared. The correctness of the obtained results was confirmed by the analysis of certified reference materials containing SiC.

15

Nickel Composite Coatings Reinforced Nano SiC Particles

Nowak M., Mizera J., Kłyszewski A., Dobkowska A., Boczkal S., Kozik A., Koprowski P.

Archives of Metallurgy and Materials

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2020

|

Vol. 65, iss. 2

935--940

EN

The paper presents the results of the electrodeposition of nickel composite coatings reinforced with the nano size SiC ceramic particles. The type and size of the ceramic particles or organic additives used play a important role during electrodeposition processes. A Watts type galvanic bath with various organic additives was used. These additives were: 2-sulfobenzoic acid imide, dioctyl sulfosuccinate sodium salt (DSS), sodium dodecyl sulfate, tris (hydroxymethyl) aminomethane and hexamethyldisilizane. The nickel composite coating was electrodeposited on a 2xxx aluminum alloy series substrate (EN-AW 2017) with zinc interlayer. The work concerns the determination of the impact of the change in the zeta potential of SiC nanoceramic particles used on properties of composite coatings (wear resistance, corrosion, etc.). The paper characterized the composite nickel coatings on aluminum alloy using SEM techniques, wear resistance tests by TABER method and coating adhesion to the substrate using the “scratch test” method. The corrosion resistance of coatings was also tested using electrochemical methods. The research allowed to determine the effect of SiC nanoceramic particle size on the value of the zeta potential in the model KCl solution.

16

Investigation of SiC Particle Size Variation on the Tribological Properties of Cu-6Sn-SiC Composite

Shankar K. V., Chandroth A. M., Ghosh K. J. A., Sudhin C. B., Pai A. S., Biju A., Sriram K. R.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 4

133--138

EN

Copper have always been an important material and incorporation of elements into copper for property enhancement. Bronze is a relevant cuprous alloy which is important for many industrial and automotive applications like bearings and machineries. The present research is directed towards the fabrication and tribological analysis of regular bronze (Cu-6Sn) and metal matrix composites reinforced with varying particle sized SiC ceramic reinforcement (30, 35 and 40 μm). The developed specimens were subjected to wear analysis according to ASTM standards, to identify the tribological properties utilizing a pin on disk tribometer. It was noted that the wear rates of developed MMC’s phenomenally decremented with an increase in size of SiC particle reinforcement. Also, the test parameters were influential in altering the wear rates to notable margins. The standard scanning electron microscopy techniques aided in identifying the influence of adhesive wear on the specimen surface.

17

Przegląd metod czyszczenia powierzchni podłoży SiC

Martychowiec Agnieszka, Kwietniewski Norbert, Sochacki Mariusz

Przegląd Elektrotechniczny

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2019

|

R. 95, nr 10

154--157

PL

Zapewnienie wysokiego poziomu uzysku produkcyjnego w technologii półprzewodnikowej wymaga opracowania poszczególnych procesów technologicznych wytwarzania przyrządu oraz wysokiej jakości podłoża. Podstawowymi wskaźnikami jakości podłoży półprzewodnikowych jest gęstość określonego rodzaju defektów oraz poziom czystości powierzchni podłoży przed kolejnymi procesami. W niniejszym komunikacie dokonano przeglądu obecnego stanu wiedzy na temat metod przygotowania i czyszczenia powierzchni węglika krzemu.

EN

Fabrication of an efficient, reliable and durable semiconductor device requires not only the development of specific technological processes used during its production, but also a high quality substrate. The quality of the substrate can be determined by the level of contamination of their surfaces and the presence of defects. They can interfere with proper operation or shorten the life of the instruments. This article reviews the current state of knowledge on the methods of preparation and cleaning of silicon carbide surfaces.

18

Mikrostruktura kompozytowej powłoki powstałej z natapiania próżniowego mieszaniny proszków Cu i SiC

Kondej Adam, Babul Tomasz

Inżynieria Powierzchni

|

2019

|

nr 1

46--53

PL

Praca opisuje badania mikrostruktury kompozytowej powłoki Cu-SiC-G powstałej w procesie natapiania w piecu próżniowym mieszaniny proszków miedzi (Cu) i węglika krzemu (SiC) na podłoże stalowe. Zastosowana mieszanina proszków stanowi materiał odpadowy pochodzący z procesu wytwarzania struktur węglowych, w tym grafenu (G), na proszkach miedzi, opracowanego w Instytucie Mechaniki Precyzyjnej. Na powierzchni powłoki Cu-SiC-G występują licznie ziarna SiC o nieregularnych, ostrych krawędziach, stanowiące fazę umacniającą metaliczną osnowę. W wyniku działania wysokiej temperatury (do 1110°C) część SiC w kontakcie z Cu ulega termicznemu rozkładowi. Zdysocjowany Si i C dyfunduje w kierunku podłoża, które z kolei jest źródłem Fe i Cr, dyfundującego w kierunku powłoki. Między powłoką a podłożem tworzy się warstwa przejściowa. Na podstawie danych literaturowych oraz wyników przeprowadzonych badań można wnioskować, że w natapianej powłoce i warstwie przejściowej oprócz Cu, SiC i związków typu CuxSiy mogą tworzyć się związki typu FexCy oraz CrxCy, a także struktury węglowe – głównie grafit. W celu jednoznacznej identyfikacji faz należy przeprowadzić dodatkowe badania, uzupełnione o rentgenowską analizę fazową (XRD).

EN

The paper describes the microstructure study of a Cu-SiC-G composite coating formed in the vacuum furnace melting process of a mixture of copper (Cu) and silicon carbide (SiC) powders on a steel substrate. The used mixture of powders is a waste material from the process of producing carbon structures, including graphene (G), on Cu powders, developed at the Institute of Precision Mechanics. On the surface of the Cu-SiC-G coating there are numerous SiC grains with irregular, sharp edges, constituting the strengthening phase of the metallic matrix. As a result of high temperature (up to 1110°C), the SiC part in contact with Cu undergoes the thermal decomposition. The dissociated Si and C diffuses towards the substrate, which in turn is the source of Fe and Cr, diffusing towards the coating. A transition layer is formed between the coating and the substrate. On the basis of the literature data and the results of the conducted tests, it can be concluded that in the melted coating and the transition layer, FexCy and CrxCy compounds can be formed in addition to Cu, SiC and CuxSy compounds, as well as carbon structures – mainly graphite. In order to uniquely identify the phases, additional tests should be performed, supplemented with a X-ray phase analysis (XRD).

19

Ceramic and Glass Fibre Reinforced Flexible Composites for Particulate Filter Walls – A Novel Approach

Prabu K., Srinivasan J., Prakash C.

Fibres & Textiles in Eastern Europe

|

2019

|

Vol. 27, no. 3 (135)

91--97

EN

Flexible composites from high performance fibres were developed and targeted to replace the wall of existing rigid ceramic Particulate Filters. The composites are made from E Glass fibre webs of different density in the middle, with standard SiC Ceramic fibres webs in in the outer layers, forming a sandwich structure. Different needling densities were applied to form nonwoven composites, and they were stitched diagonally on the surface at specified intervals with continuous glass fibre filament yarn. In total, nine novel flexible composites were developed and evaluated for their structural, surface, mechanical and thermal properties. Based on the results and statistical analysis, the B2 sample is considered to be taken for further research to develop Particulate Matter (PM) filters.

PL

W pracy opracowano giętkie kompozyty wzmocnione włóknami ceramicznymi i szklanymi do zastosowania w ścianach filtrów cząstek stałych. Kompozyty tworzące strukturę wielowarstwową zostały wykonane ze wstęg z włókna szklanego o różnej gęstości (warstwa wewnętrzna) i włókien ceramicznych (warstwa zewnętrzna). Zastosowano różne gęstości igłowania w celu utworzenia kompozytów włókninowych i zszyto je ukośnie na powierzchni w określonych odstępach za pomocą ciągłej przędzy z włókna szklanego. Opracowano dziewięć nowych giętkich kompozytów i oceniono ich właściwości: strukturalne, powierzchniowe, mechaniczne i termiczne. Na podstawie wyników i analizy statystycznej stwierdzono, że do dalszych badań w celu opracowania filtrów materii cząstek stałych (PM) należy wytypować próbkę B2.

20

Effect of Various Organic Additives in Galvanic Bath on Properties of Ni-SiC Composite Coatings

Nowak M., Mizera J., Kłyszewski A., Dobkowska A., Boczkal S., Kozik A., Koprowski P.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 4

1327--1333

EN

The paper presents the results of the electrodeposition of nickel composite coatings reinforced with the ceramic SiC particles. A Watts type galvanic bath modified with various organic additives was used. These additives were: 2-sulfobenzoic acid imide (LSA), dioctyl sulfosuccinate sodium salt (DSS), sodium dodecyl sulfate (SDS), tris (hydroxymethyl) aminomethane (THAM) and hexamethyldisilizane (HMDS). The nickel composite coating was electrodeposited on a 2xxx aluminum alloy series substrate (EN-AW 2017) with zinc interlayer. Studies concerned the effect of the applied organic additives on properties of composite coatings such as: microstructure, microhardness, adhesion to the substrate, corrosion resistance and roughness. The structure of the coatings was assessed by scanning electron microscopy and light microscopy. Based on the studies of zeta potential it was found that the bath modification had a significant impact on the amount of the ceramic phase embedded in metal matrix. The tests conducted in a model 0.01 M KCl solution were not fully representative of the true behavior of particles in a Watts bath.