eta相对WC-Co碳化物磨损行为的影响

IF 1.5 Q3 ENGINEERING, MECHANICAL Advances in Tribology Pub Date : 2016-01-03 DOI:10.1155/2016/5063274
A. Formisano, F. Minutolo, A. Caraviello, L. Carrino, M. Durante, A. Langella
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引用次数: 18

摘要

硬质合金,又称Widia,是通过烧结工艺生产的硬质金属,广泛应用于机械加工。切削能力强,耐磨性好;因此,它们是制造切削工具和喷砂喷嘴的优良材料。本文对含eta相的WC-Co碳化物的耐磨性进行了分析。eta相是硬质金属中碳含量不足时出现的一种次级相。制备不同的碳化物混合物,并与不同重量百分比的碳进行烧结,以形成eta相,然后分析碳含量对材料耐磨性的影响。这种表征是通过磨料磨损试验进行的。试验参数的选择考虑了喷砂喷嘴的工作条件。通过显微观察和对不同混合物的硬度和显微硬度的评价来收集额外的信息。分析强调,在碳含量低于一定限度时,会发生不良烧结。考虑到没有这些烧结问题的混合物,它们的耐磨性取决于eta相的大小和分布;高碳亏缺的品种表现出最好的性能。
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Influence of Eta-Phase on Wear Behavior of WC-Co Carbides
Cemented carbides, also known as Widia, are hard metals produced by sintering process and widely used in mechanical machining. They show high cutting capacity and good wear resistance; consequently, they result to be excellent materials for manufacturing cutting tools and sandblast nozzles. In this work, the wear resistance of WC-Co carbides containing Eta-phase, a secondary phase present in the hard metals when a carbon content deficiency occurs, is analyzed. Different mixtures of carbide are prepared and sintered, with different weight percentages of carbon, in order to form Eta-phase and then analyze how the carbon content influences the wear resistance of the material. This characterization is carried out by abrasive wear tests. The test parameters are chosen considering the working conditions of sandblast nozzles. Additional information is gathered through microscopic observations and the evaluation of hardness and microhardness of the different mixtures. The analyses highlight that there is a limit of carbon content below which bad sintering occurs. Considering the mixtures without these sintering problems, they show a wear resistance depending on the size and distribution of the Eta-phase; moreover, the one with high carbon content deficiency shows the best performance.
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来源期刊
Advances in Tribology
Advances in Tribology ENGINEERING, MECHANICAL-
CiteScore
5.00
自引率
0.00%
发文量
1
审稿时长
13 weeks
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