SHS Compaction of TiC-Based Cermets Using Mechanically Activated Mixtures

IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Russian Journal of Non-Ferrous Metals Pub Date : 2024-10-19 DOI:10.1134/S1067821224600236
Yu. V. Bogatov, V. A. Shcherbakov
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Abstract

This paper is concerned with obtaining metal-ceramic composite materials through the method of SHS compaction. The study investigates the influence of mechanical activation of metallic components in reactive mixtures based on the Ti + C + Cr + Ni system on the structure and properties of the resulting composites. Mechanical activation of the Ti, Cr, and Ni metallic powders was performed using two methods. In the first method, Cr and Ni powders were activated separately from the other components of the reactive mixtures using grinding media in a ball mill, after which they were mixed with Ti and carbon black powders. It was shown that the preliminary mechanical activation of the inert components reduces the combustion temperature and rate, which increases the average size of carbide grains. The second method involved a joint processing of Ti + Cr, Ti + Ni, and Ti + Cr + Ni powder mixtures in a ball mill, which were then mixed with carbon black. This method provided mechanical activation of titanium particles while minimizing the impact of grinding media on Cr and Ni powders. This led to an increase in the combustion rate and temperature, a decrease in the average size of carbide grains, and an improvement in the uniformity of the composite structure. A mechanism of interaction between the reagents (Ti + C) involving activated Cr and Ni particles in the combustion and structure formation zones is proposed. According to this mechanism, the mechanical activation of inert components leads to their direct participation in the reaction between titanium and carbon, which determines the reduction in combustion rate and temperature and affects the dispersion and uniformity of the structure of compact composites. The results were used to enhance the uniformity and refine the structure of the STIM-3B composite (synthetic hard tool material grade 3B).

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使用机械活化混合物对 TiC 基金属陶瓷进行 SHS 压实
本文研究通过 SHS 压实法获得金属陶瓷复合材料。研究调查了基于 Ti + C + Cr + Ni 体系的反应混合物中金属成分的机械活化对所得复合材料结构和性能的影响。钛、铬和镍金属粉末的机械活化采用了两种方法。在第一种方法中,使用球磨机中的研磨介质将铬和镍粉与反应混合物中的其他成分分开活化,然后将它们与钛和炭黑粉末混合。结果表明,惰性成分的初步机械活化降低了燃烧温度和速度,从而增加了碳化物晶粒的平均尺寸。第二种方法是在球磨机中联合处理钛+铬、钛+镍和钛+铬+镍的粉末混合物,然后将其与炭黑混合。这种方法可对钛颗粒进行机械活化,同时将研磨介质对铬和镍粉的影响降至最低。这提高了燃烧速率和温度,减小了碳化物颗粒的平均尺寸,并改善了复合结构的均匀性。提出了试剂(Ti + C)与燃烧区和结构形成区的活化铬和镍颗粒之间的相互作用机制。根据这一机制,惰性成分的机械活化导致它们直接参与钛和碳之间的反应,这决定了燃烧速率和温度的降低,并影响了致密复合材料结构的分散性和均匀性。研究结果用于提高 STIM-3B 复合材料(3B 级合成硬质工具材料)的均匀性并完善其结构。
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来源期刊
Russian Journal of Non-Ferrous Metals
Russian Journal of Non-Ferrous Metals METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
1.90
自引率
12.50%
发文量
59
审稿时长
3 months
期刊介绍: Russian Journal of Non-Ferrous Metals is a journal the main goal of which is to achieve new knowledge in the following topics: extraction metallurgy, hydro- and pirometallurgy, casting, plastic deformation, metallography and heat treatment, powder metallurgy and composites, self-propagating high-temperature synthesis, surface engineering and advanced protected coatings, environments, and energy capacity in non-ferrous metallurgy.
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