氮代钽硬质合金的制备与性能研究

Research on Preparation and Properties of Cemented Carbide by Tantalum Replaced by Nitrogen

采用特殊工艺进行了硬质合金材料原料粉体的氮化处理,并对粉体的氮化效果进行了XRD、XPS和SEM分析,阐述了粉体的氮化机理与过程。采用该氮化粉体进行了硬质合金刀片的烧结,并对烧结后的刀片断口形貌、相关物理、力学性能进行了分析。结果表明：采用此氮化工艺烧结的硬质合金材料能达到或超过添加TaC的硬质合金材料性能,这在一定程度上实现了硬质合金中氮对钽元素的替代。

The nitrogen treatment for raw powder of cemented carbide material was carried out by special process, and the nitriding effect for the powder was analyzed by XRD, XPS and SEM. The nitriding mechanism and process of the powder were elaborated. The sintering of the carbide blades were carded out by using the nitrided powder, and the fracture morphology, related physical properties and mechanical properties of the blades after sintering were analyzed. The results show that the properties of the cemented carbide material sintered by the nitrided prcess can reach or exceed the properties of the cemented carbide material adding with TaC, which can realize the N instead of Ta in a certain degree.