Novel industrial hardmetals for mining, construction and wear applications

Konyashin, I.; Ries, B.; Hlawatschek, S.; Mazilkin, Andrey

doi:10.1016/j.ijrmhm.2017.10.021

Cited by 33 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hard alloys based on tungsten carbide and containing a readily fusible metallic binder (usually cobalt) lend themselves to a wide range of industrial applications [1][2][3][4][5][6][7][8][9][10][11][12]. The development of the wear-resistant cutting tools allowing for a high-speed processing of structural materials (titanium alloys, austenite corrosion-resistant steels, heat-resistant alloys, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…The development of the wear-resistant cutting tools allowing for a high-speed processing of structural materials (titanium alloys, austenite corrosion-resistant steels, heat-resistant alloys, etc.) is one promising application of the fine-grained hard alloys based on tungsten carbide [1,3,5,6,[9][10][11][12]. The fine-grained hard alloys-based tungsten carbide is interesting for applications in dies, roll drums, and engineering products, which are imposed to increased requirements of strength and wear resistance due to a successful combination of a high melting point, high hardness, fracture toughness (see Appendix A, Table A1, ), low friction coefficient, and high corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

et al. 2021

View full text Add to dashboard Cite

This study investigates the impact of carbon on the kinetics of the spark plasma sintering (SPS) of nano- and submicron powders WC-10wt.%Co. Carbon, in the form of graphite, was introduced into powders by mixing. The activation energy of solid-phase sintering was determined for the conditions of isothermal and continuous heating. It has been demonstrated that increasing the carbon content leads to a decrease in the fraction of η-phase particles and a shift of the shrinkage curve towards lower heating temperatures. It has been established that increasing the graphite content in nano- and submicron powders has no significant effect on the SPS activation energy for “mid-range” heating temperatures, QS(I). The value of QS(I) is close to the activation energy of grain-boundary diffusion in cobalt. It has been demonstrated that increasing the content of graphite leads to a significant decrease in the SPS activation energy, QS(II), for “higher-range” heating temperatures due to lower concentration of tungsten atoms in cobalt-based γ-phase. It has been established that the sintering kinetics of fine-grained WC-Co hard alloys is limited by the intensity of diffusion creep of cobalt (Coble creep).

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Hardmetals are used in a wide range of applications as in cutting, metal machining, mining or construction [1,2]. Among the variety of developed alloys, binderless tungsten carbides find some specific applications where high hardness, abrasive wear corrosion resistance and high temperature strength are required [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Microstructural investigations in binderless tungsten carbide with grain growth inhibitors

Lay

Antoni‐Zdziobek

Pötschke

et al. 2020

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

The microstructure of binderless tungsten carbide, with small additions of Cr3C2 or VC, was investigated using transmission electron microscopy associated with X-ray energy dispersive spectrometry. The distribution of Cr and V elements was determined. In the material sintered with Cr3C2, numerous (Cr,W)2C grains were found, some of them displaying an epitaxy orientation relationship with the basal facet of adjacent WC grains, and Cr segregation was observed in all examined grain boundaries. In the carbide with VC additive, small V-rich carbides were found at triple junctions of WC grains. Unlike Cr, no V segregation was detected in grain boundaries. The grain growth inhibiting effect of Cr3C2 and VC is very likely different. For Cr3C2, it is supposed that both (Cr,W)2C grains and Cr segregation reduce the mobility of grain boundaries. For VC, probably the grain boundary triple junctions are pinned by small V-rich carbide grains.

show abstract

“…A difração de raios X aliada ao método de Rietveld são técnicas utilizadas na caracterização de materiais, possibilitando a análise qualitativa e quantitativa de fases, determinação da cristalinidade, parâmetros da rede cristalina, densidade e volume de célula unitária e medidas mais específicas, como tensão residual e textura [13,17]. O estudo desses materiais e compósitos é relevante pelo fato dos mesmos serem utilizados em inúmeros seguimentos da indústria de ferramentas de corte para usinagem, mineração, construção civil, brocas e minibrocas, suportes, motores elétricos, componentes de equipamentos da indústria de exploração e produção de óleo e gás, também é largamente utilizado na indústria automobilística [18].…”

Section: Introductionunclassified

Caracterização da matéria-prima com tamanho de partículas nanométricas utilizadas no processamento do compósito WC-10%Co

Batista¹,

Aguiar

Oliveira

et al. 2020

Matéria (Rio J.)

View full text Add to dashboard Cite

RESUMO O compósito WC-10%Co também conhecido como Metal Duro de Carbeto de Tungstênico (WC) com Cobalto (Co) é um dos materiais mais produzidas pela indústria fabricante de metal duro, entretanto busca-se o melhor entendimento sobre o efeito de parâmetros de processo sobre as suas características estruturais, especialmente no que diz respeito à formação de fases metaestáveis – fases η. Neste trabalho, usamos o método de Rietveld aliado a difração de raios X (DRX), a microscopia eletrônica de varredura (MEV) e o Brunauer – Emmett – Teller (BET) para investigar a estrutura das matérias-primas utilizadas na produção de metal duro. Os tamanhos das partículas assim como as morfologias identificadas para os pós de WC e Co são reflexos do seu processo de fabricação que, introduzem tensões residuais para o pó de WC, a baixa cristalinidade e significante parcela de amorfo para o pó de Co. Estas características foram identificadas com a difração de raios X em comparação com o padrão de difração obtido e os bancos de dados cristalográficos. Após o processo de mistura dos pós foram quantificadas as fases e identificados os efeitos desse processo sobre as células unitárias de cada fase. Este trabalho mostra que a rota de caracterização empregada, com o uso do método de Rietveld, é eficiente para analisar a estrutura desses materiais durante seu processamento. Foi possível observar que o processo de mistura utilizando equipamento de moagem de alta energia promove alteração na densidade das células unitárias do WC “empurrando” átomos de Co para dentro de sua estrutura. Isso pode vir a acelerar o processo de dissolução de grande parte das partículas de WC durante a sinterização, contribuindo para a formação acentuada das fases metaestáveis eta – η, prejudicando o equilíbrio entre as propriedades mecânicas de dureza e tenacidade à fratura tornando a ferramenta ou peça muito dura e pouco tenaz.

show abstract

Novel industrial hardmetals for mining, construction and wear applications

Cited by 33 publications

References 15 publications

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

Microstructural investigations in binderless tungsten carbide with grain growth inhibitors

Caracterização da matéria-prima com tamanho de partículas nanométricas utilizadas no processamento do compósito WC-10%Co

Contact Info

Product

Resources

About