Nitriding of tungsten carbide alloy powders for wear-resistant coating

本建议旨在开发一种氮化处理，以减少碳化钨(WC)的混溶 液态金属基质中的粉末。它解决了Recentis Advanced主要感兴趣的一个问题 材料，一家专门制造高阻涂料的公司，他开发了一种新的 碳化钨合金系列((W，M)Cx M=Ti，V，Nb，Zr)，旨在改善机械性能和 化学稳定性，适用于冶金、航空航天、汽车和工具行业。建议数 方法是基于对多种渗氮工艺和额外气体加热的测试 首先是处理，然后是用于工艺表征和优化的先进措施。气体渗氮是 一种表面硬化工艺，其中氮被添加到材料的表面，使用离解的氨气作为 消息来源。所有处理过的样品(碳化物粉末和衬底)的成分和形态 随后将通过拉曼光谱、x射线衍射(x射线衍射)、x射线光电子能谱进行分析 显微镜(XPS)、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实现最佳工艺。我们的 研究将更具体地集中在加工后的WC微晶的核-壳结构上，其 改进的热机械性能可以减少焊接过程中的溶解，并提高 含碳化物金属基复合材料的耐磨性。所有实施的治疗措施都将是 在Recentis和INRS的密切合作下，并在工业可行性参数范围内实现 总部设在加拿大的合作伙伴，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.