Wyniki wyszukiwania - BazTech

1

Development in PTA surface modifications – a review

Łatka L., Biskup P.

Advances in Materials Science

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2020

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Vol. 20, nr 2(64)

39--53

EN

Surface modification is one of the most intensively studied issue of technology, which is related to the almost all branches of industry. Since more than 100 years the huge number of methods has been developed and are still in growth. On this field the plasma transferred arc (PTA) hardfacing and surfacing is one of the most frequently used group of the method. The development of this method is going in three ways: (i) modification of the classic technique and the equipment, (ii) development in new materials, especially with the nanometric size and (iii) replacement dangerous materials (e.g. high cobalt alloys). In the current article the state of the art as well as the development directions of the plasma hardfacing issues are described.

2

Odporność na erozję wybranych stali i żeliw

Hejwowski T.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2009

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Z. 12

CD-CD

PL

W pracy przedstawiono konstrukcję testera odśrodkowego do badania erozji oraz wyniki badań erozji stopów na osnowie żelaza. W badaniach wykorzystano jako ścierniwa SiC i pył klinkierowy pobrany z elektrofiltru. Wykazano istotny wpływ zjawiska fragmentacji ziaren na przebieg zjawiska erozji. Rankingi badanych stopów zależały od warunków testu. Zużycie przez cząstki klinkieru stopów o dużej zawartości dodatków stopowych miało charakter preferencyjny. Wartości udziału objętościowego faz i twardości mogą być stosowane jako kryterium wstępnej selekcji stopów jedynie w przypadku zużycia powodowanego przez twarde cząstki padające pod niewielkim kątem.

EN

In the paper the scheme of centrifugal erosion tester was presented along with results of erosion tests carried out on a number ofFe-base alloys. In the tests, a clinker dust collected from the electrofilter of the cement plant and SiC were applied as abrasives. The distinct effect of particle fragmentation on erosion was proved. Rankings of tested alloys depended on experimental conditions. Erosive wear of alloys with high content of additives by clinker dust revealed preferential character. Volume content of hard phase and bulk hardness can be only used as criteria of preliminary choice of materials resistant to low angle erosion by hard abrasives.

3

Robotized PTA surfacing of nanomaterial layers

Klimpel A., Kik T., Górka J., Czupryński A., Hajduk P.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 37, nr 2

644-651

EN

Purpose: of this research was to investigate the influence of heat input in robotized surfacing on quality and properties of nanomaterial layers. Design/methodology/approach: quality of single and multilayer, stringer and weave beads was assessed by abrasion resistance tests according to ASTMG65 standard, erosion resistance tests according to G76 standard, metallographic examinations and hardness tests. Findings: due to the fact that the robotized surfacing stand was used, the analysis of properties of the deposits was performed for single and multilayer, stringer and weave beads. Research limitations/implications: for complete information about tested deposits it is needed to compare deposits properties PTA surfaced with other technologies of nanomaterial layers manufacturing products. Practical implications: Results of this paper is an optimal range of parameters of surfacing of single and multilayer, stringer and weave beads of nanomaterial layers. Originality: tests, abrasion and erosion resistance tests) were provided for surfacing of single and multilayer, stringer and weave beads, and the results were compared. The influence of heat input on layers properties and theirs structure was defined.

4

Effect of chemical composition on microstructure and wear resistance of flame sprayed Ni-5% Al/Al2O3 -40% TiO2 cermet coating

Hejwowski T., Łabacz-Kęcik A.

Inżynieria Materiałowa

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2009

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Vol. 30, nr 5

414-417

EN

Flame subsonic spraying is capable of depositing dense cermet coatings. Incorporation of ceramics into the coating increases erosion resistance for mass fractions of Al2O3-40% TiO2 below 40%. In the 3-body abrasion test, the mass losses of cermet coatings were found greater than for either Ni-5% Al or Al2O3 -40% TiO2 coating which was caused by the dominating effect of microstructure. The microstructure of cermet coating expressed in terms of splat shape factor, pore shape factor and porosity volume fraction depended on the chemical composition of the feedstock material. Large values of ceramic grain shape factor (over 1.5) corresponded to high wear resistance. Effect of surface roughness, pores and cracks on mass loss in wear tests was proven in SEM examinations.

PL

Natryskiwanie płomieniowe poddźwiękowe umożliwia wytwarzanie powłok o stosunkowo nieznacznej porowatości. Wprowadzenie ceramiki do materiału powłoki zwiększa odporność na erozję dla udziałów objętościowych Al2O3-40% TiO2 poniżej 40%. Wyznaczone w badaniach ścieralności ubytki masy powłok cermetalowych były wyższe od ubytków masy powłok Ni-5% Al oraz Al2O3-40% TiO2, co było spowodowane istotnym wpływem mikrostruktury. Mikrostruktura powłoki, wyrażona przez współczynniki kształtu ziaren i porów oraz przez udział objętościowy porowatości, zależała od składu chemicznego materiału proszkowego. Wysokie wartości współczynnika kształtu ziaren ceramiki (powyżej 1,5) były skojarzone z wysoką odpornością na zużycie. Wpływ chropowatości, porów i pęknięć na ubytek masy w testach zużycia został potwierdzony w badaniach SEM.

5

Mikrostruktura warstw odpornych na erozję na kompozycie węglowym

Moskalewicz T., Czyrska-Filemonowicz A.

Inżynieria Materiałowa

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2008

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Vol. 29, nr 6

707-710

PL

W pracy przeprowadzono charakterystykę mikrostruktury kompozytu węglowego, jak również warstw TiC i SiC oraz warstwy z układu SiO2-Al2O3- Y2O3 wytworzonych na tym kompozycie. Warstwy zostały wytworzone na kompozycie poprzez zanurzanie w zawiesinie w celu poprawy jego odporności na erozję. Metodami mikroskopii świetlnej oraz analitycznej skaningowej i transmisyjnej mikroskopii elektronowej wykonano szczegółowe badania mikrostruktury oraz identyfikację składu fazowego kompozytu i warstw. Stwierdzono, że kompozyt jest zbudowany z połączonych ze sobą włókien węglowych. Wykazano, że warstwa SiC ma budowę nanokrystaliczną. Warstwa TiC zbudowana jest z fazy TiC. W warstwie ze szkła ceramicznego z układu SiO2-Al2O3-Y2O3 stwierdzono występowanie następujących faz: SiO2, Y2Si2O7 i Al4,644Si1,357O9.68.

EN

A microstructure of as received and surface treated carbon bonded carbon fibre (CBCF) composites were examined by light microscopy, scanning and transmission electron microscopy. The microstructure of the as received material consists of a bonded together layered carbon fiber network, identified as graphitic carbon (hcp). In order to improve the erosion resistance of the CBCF composite, the TiC, SiC and silicate glass-ceramic coatings from the system SiO2-Al2O3-Y2O3 (SAY) were produced on CBCF composites by a low cost slurry technique. TEM investigations of cross-section thin foils allowed for detailed analysis of the coatings microstructure. It was found that the Sic coating was consisting mainly of a nanocrystalline SiC (fcc). The TiC coating was consisting of TiC (fcc) phase. The glass-ceramic coating showed a complex microstructure consisting of an external SAY layer and an intermediate nanocrystalline SiC layer. The SAY layer was composed of SiO2 (fcc), Y2Si2O7 (op) and Al4.644Si1.357O9.68 (op).

6

Badania odporności na erozję stopu aluminium PA6 po umacnianiu udarowym

Napadłek W.

Inżynieria Materiałowa

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2008

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Vol. 29, nr 6

1090-1093

PL

Przedstawiono wyniki badań laboratoryjnych odporności na erozję stopu aluminum PA6 po udarowym mechanicznym umacnianiu oraz po umacnianiu. laserowym. Stwierdzono znaczący wzrost odporności umocnionego stopu w stosunku do materiału wyjściowego. Wróży to obiecujące perspektywy technologiczne.

EN

The results of laboratory investigations of erosion resistance of PA6 aluminum alloy after impact mechanical strengthening as well as laser one have been presented. It was affirmed a significant increase of resistance of strengthening alloy in relation to initial material. It augurs promising technological prospects.

7

Odporność na erozję betonów wysokowartościowych w konstrukcjach hydrotechnicznych

Horszczaruk E.

Cement Wapno Beton

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2007

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R. 12/74, nr 3

125-132

PL

Przedstawiono wyniki badań zużycia ściernego betonów wysokowartościowych wykonane metodą podwodną opisaną w ASTM C 1138. Opracowany model zużycia ściernego betonu dobrze opisuje wyniki doświadczalne, w tym także BWW. Model ten uwzględnia rodzaj zbrojenia i wskaźnik w/c. Doświadczenia wykazały, że najlepszą odporność na ścieranie wykazał beton zbrojony włóknami polipropylenowymi.

EN

Paper presents a mathematical model of abrasive wear of concrete in hydraulic engineering structures. The underwater method according to ASTM C 1138 was applied to test the abrasive wear of concrete. This model embraces the influence of w/c ratio and kind of reinforcement. Experimental results are well matched by the model.

8

Robotized GMA surfacing of cermetalic layers

Klimpel A., Dobrzański L. A., Kik T., Rzeźnikiewicz A.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

361--364

EN

Purpose: Purpose of these researches was to investigate of influence of heat input in robotized surfacing on quality and properties of cermetalic layers. Design/methodology/approach: The quality of single and multilayer, stringer and weave beads was assessed by abrasion resistance tests according to ASTMG65 standard, erosion resistance tests according to G76 standard, metallographic examinations and hardness tests. Findings: Due to the fact that the it was used robotized surfacing stand, the analysis of properties of the deposits was performed for single and multilayer, stringer and weave beads. Research limitations/implications: For complete information about tested wear plates it is needed to compare theirs properties with others presented technologies of wear plates producing. Practical implications: Results of this paper is to optimal range of parameters of surfacing of single and multilayer, stringer and weave beads of cermetalic layers. Originality/value: The researches (hardness tests, abrasion and erosion resistance tests) were provided for surfacing of single and multilayer, stringer and weave beads, and the results were compared. The influence of heat input on layers properties and theirs structure was defined.

9

Comparison of chromium cast iron deposits of wear plates

Klimpel A., Górka J., Czupryński A.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

387--390

EN

Purpose: of these researches was to compare of chromium cast iron wear plates deposits properties. Design/methodology/approach: : the quality of wear plates was assessed by low-stress abrasion resistance to metal-ceramic scratching by means dry quartz sand as the abrasion material tests according to G65 standard, erosion resistance tests according to G76 standard, metallographic examinations and hardness tests. Findings: due to the fact that the wear plates were produced by overlap weave beads surfacing method, the analysis of properties of the plates was performed in the middle area of deposits as well as overlap beads area. Research limitations/implications: for complete information about tested wear plates it is needed to compare theirs properties with others presented plates Practical implications: results of this paper is to increase quality of wear plates and comparison of properties of wear plates produced by different producers. Originality/value: the researches (hardness tests, abrasion and erosion resistance tests) were provided in the middle area of deposits and also in overlap area, the results were compared.

10

Cavitation erosion of A2 structure steels processed by laser beam and laser plasma.

Gireń B.G., Szkodo M.

Inżynieria Materiałowa

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2001

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R. XXII, nr 4

345-349

EN

In order to define the influence of laser beam and laser plasma processing on the performance of body centered cubic steels under the cavitation loading, the samples of chromium steel, carbon steel and low-alloy manganese and nickel steels were superficially remelted by a cw Co2 laser beam in presence or without participation of the optical discharge plasma. Afterwards, the workpieces were subjected to the process of cavitation erosion in the rotating disk facility. The tests carried out revealed multiple - 1.8 to 10 times - increase of cavitation resistance of investigated materials during the incubation period of the destruction. This effect was found to be not decisively linked to the obtained microhardness changes. Both the ability of the samples surface layers to accumulate the energy and the residual stresses trapped within the processed zone were also pointed as features having considerable significance for cavitation resistance of the material.