Abstract

The analysis of modern approaches in choosing compositions of cermets based on TiC carbide and Ni matrix doped with additional Mo, W, Cr, Nb, and Ta carbides is carried out. The hardness and transverse strength of the cermets based on TiC carbide and Ni matrix increases with the use of additional Mo, W, Cr carbides owing to the formation of an annular zone around TiC. The calculated microhardness of carbides in the cermet increases with an increase in their volume fraction and with the use of Mo, W, and Cr carbides. On the basis of an analysis of the literature, TiC–Cr₃C₂–WC–TiB₂–SiC–Mo–B–Si–Ni cermets with additional carbon content for plasma coatings are proposed and studied. Mechanical alloying and liquid phase sintering at temperatures of 950, 1250, and 1450°C are used to evenly distribute the carbides in the base phase and to establish strong bonds between them with high values of microhardness, up to 2438 kgf/mm² at a load on the indenter of 20 G and 2030 kgf/mm² at a load on the indenter of 200 G. The maximum values of microhardness are obtained at higher sintering temperatures at which the minimum content of oxygen is fixed. The positive effect of carbides based on W, Mo, and Cr on the organization of a strong titanium carbide compound with a base phase is confirmed experimentally, which is proved by the calculated value of the contribution of microhardness of TiC carbide to the cermet microhardness. At a volume fraction of the carbides of 77% and a load on the indenter of 20 G, the contribution of microhardness of the carbide is equal to 2906 kgf/mm², which is close to the TiC hardness of 3200 kgf/mm². This contribution of microhardness is equal to 2145.5 kgf/mm² at a load on the indenter of 200 G.

中文翻译：

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TiC–Cr 3 C 2 –WC–TiB 2 –SiC基金属陶瓷

摘要

进行了分析现代方法的选择，这些方法基于掺有Mo，W，Cr，Nb和Ta碳化物的TiC碳化物和Ni基体来选择金属陶瓷。基于TiC碳化物和Ni基体的金属陶瓷的硬度和横向强度由于在TiC周围形成环形区域而增加了Mo，W，Cr碳化物的使用而增加。金属陶瓷中碳化物的显微硬度随其体积分数的增加以及使用Mo，W和Cr碳化物的增加而增加。根据文献分析，TiC–Cr ₃ C ₂ –WC–TiB ₂提出并研究了具有附加碳含量的–SiC–Mo–B–Si–Ni金属陶瓷。在950、1250和1450°C的温度下进行机械合金化和液相烧结可将碳化物均匀地分布在基相中，并在它们之间建立牢固的结合，并具有很高的显微硬度值，最高可达2438 kgf / mm ²。压头上的负载为20 G和2030 kgf / mm ²在压头上施加200 G的载荷时，显微硬度的最大值在较高的烧结温度下获得，在该温度下，最低氧含量是固定的。通过实验证实了基于W，Mo和Cr的碳化物对具有基相的强碳化钛化合物组织的积极作用，这可通过计算得出的TiC碳化物的显微硬度对金属陶瓷显微硬度的贡献值来证明。在77％的碳化物体积分数和20 G的压头载荷下，碳化物的显微硬度贡献等于2906 kgf / mm ²，与TiC硬度3200 kgf / mm ²接近。在200 G压头上的负载下，显微硬度的贡献等于2145.5 kgf / mm ²。