Nitriding of tungsten carbide alloy powders for wear-resistant coating

本提案旨在开发一种用于降低碳化钨（WC）易熔性的氮化处理方法 液态金属基质中的粉末。它解决了Recentis Advanced的一个主要问题 Materials是一家专门生产高耐腐蚀涂层的公司， 碳化钨合金家族（（W，M）CX M=Ti，V，Nb，Zr），其目标是改善机械性能， 化学稳定性，适用于冶金、航空航天、汽车和工具行业。拟议 该方法是基于对各种渗氮工艺和附加气体热处理的测试 处理，然后是先进的测量过程表征和优化。气体渗氮是 一种表面硬化工艺，其中使用离解的氨作为氮添加到材料的表面， 源头所有处理过的样品（碳化物粉末和基体）的成分和形态 随后将通过拉曼光谱、X射线衍射（XRD）、X射线光电子能谱（XPS）、X射线衍射（XRD）和X射线光电子能谱（XPS）进行分析。 原子力显微镜（AFM）和扫描电子显微镜（SEM），以便 确定每种气体处理的效率，并指导我们的工业合作伙伴采用最佳工艺。我们 研究将更具体地集中在加工的WC微粒的核-壳结构上， 改善的热机械性能可以减少它们在焊接过程中的溶解， 含碳化物金属基复合材料的耐磨性。所有实施的治疗将 在Recentis和INRS之间的密切合作下，在工业可行性参数范围内， 加拿大的合作伙伴，以立即进行技术转让。

This proposal aims to develop a nitriding treatment for reducing the miscibility of tungsten carbide (WC) powders within liquid metal matrices. It addresses a problem of major interest for Recentis Advanced Materials, a company specialized in the fabrication of highly resistant coatings, who has developed a new family of tungsten carbide alloys ((W,M)CX M=Ti, V, Nb, Zr) targeting improved mechanical properties and chemical stability, for applications in metallurgy, aerospace, automotive and tool industries. The proposed methodology is based on the testing of a large variety of nitriding processes and additional gas thermal treatments, followed by advanced measurements for process characterization and optimization. Gas nitriding is a surface hardening process, where nitrogen is added to the surface of materials using dissociated ammonia as the source. Both the composition and the morphology of all treated samples (carbide powders and substrates) will be subsequently analyzed by Raman spectroscopy, x-ray diffraction (XRD), X-ray Photoelectron Microscopy (XPS), Atomic Force Microscopy (AFM) and scanning electron microscopy (SEM), in order to determine the efficiency of each gas treatment and guide our industrial partner towards the best process. Our research will more specifically focus on the core-shell structure of the processed WC micrograins whose improved thermo-mechanical properties can reduce their dissolution during the welding process and enhance the wear resistance of carbide-containing metal matrix composites. All implemented treatments will be achieved in close collaboration between Recentis and INRS and within the feasibility parameters of industrial partners based in Canada, for immediate technology transfer.