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无钴金属陶瓷与硬质合金的磨损性能及高温氧化的对比研究

A Comparative Study on the Wear Performance and High-Temperature Oxidation of Co-Free Cermets and Hardmetals.

作者信息

Biedma Ángel, Sánchez Gabriel, de Nicolás María, Bertalan Claudio, Useldinger Ralph, Llanes Luis, Gordo Elena

机构信息

GTP-Department of Materials Science and Engineering, IAAB, Universidad Carlos III de Madrid, 28911 Leganés, Madrid, Spain.

Sustainable Powder Technologies-IMDEA Materials Institute, 28906 Getafe, Madrid, Spain.

出版信息

Materials (Basel). 2024 Jul 22;17(14):3615. doi: 10.3390/ma17143615.

DOI:10.3390/ma17143615
PMID:39063906
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11279169/
Abstract

The present investigation addresses the mechanical properties, wear behaviour, and high-temperature oxidation of cermets and hardmetals based on either Ti(C,N) or WC and a metal binder based on Fe15Ni or Fe15Ni10Cr. This study also includes a commercial-grade WC-Co for comparative purposes. The production of these materials involved a powder metallurgy and sinter-HIP processing route under identical conditions. It is found that WC-based materials have superior mechanical properties, including hardness, fracture toughness, transversal rupture strength (TRS), and wear response, compared to Ti(C,N)-based materials. However, the latter show better oxidation behaviour than the former. Notably, WC-FeNi exhibits a higher hardness and TRS than the commercial-grade material (an increase of 7% and 9%, respectively). The difference in wear behaviour is due to the difference in wear mechanisms. In this regard, cermets wear through a tribolayer of Ti and Fe oxides, while hardmetals primarily wear through abrasion from ploughing. Thus, hardmetals exhibit a lower coefficient of friction (COF) and wear rate than cermets. Furthermore, Ti(C,N)-based materials form a protective layer of TiO, which enhances their integrity and reduces mass gain. The addition of Cr to the FeNi binder only appears to have a clear effect on the TRS of the materials.

摘要

本研究针对基于Ti(C,N)或WC以及基于Fe15Ni或Fe15Ni10Cr的金属粘结剂的金属陶瓷和硬质合金的力学性能、磨损行为和高温氧化进行了研究。本研究还包括一种商业级WC-Co用于对比。这些材料的生产涉及在相同条件下的粉末冶金和烧结热等静压加工路线。研究发现，与基于Ti(C,N)的材料相比，基于WC 的材料具有优异的力学性能，包括硬度、断裂韧性、横向断裂强度（TRS）和磨损响应。然而，后者的氧化行为比前者更好。值得注意的是，WC-FeNi的硬度和TRS高于商业级材料（分别提高了7%和9%）。磨损行为的差异是由于磨损机制的不同。在这方面，金属陶瓷通过Ti和Fe氧化物的摩擦层磨损，而硬质合金主要通过犁削磨损。因此，硬质合金的摩擦系数（COF）和磨损率低于金属陶瓷。此外，基于Ti(C,N)的材料形成了TiO保护层，增强了其完整性并减少了质量增加。向FeNi粘结剂中添加Cr似乎仅对材料的TRS有明显影响。

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