Abstract
Ultra-fine tungsten carbide (WC) powder refers to WC powders with a particle size between 100 to 500 nm. Researchers have improved the comprehensive properties of WC-based cemented carbides by preparing ultra-fine WC powders. Because of the preparation and application of nano-scale WC powders, ultrafine-grain cemented carbides with excellent hardness and wear resistance have been successfully produced. In this paper, the preparation methods of ultra-fine WC powder are divided into solid-phase, liquid-phase, and vapor-phase methods according to the state of the raw materials (i.e., the W or C source). The liquid-phase methods could realize the preparation of WC at the temperature between 500 - 800 °C. The purity of WC prepared by vapor-phase method is the highest. The solid-phase reduction carbonization method has potential industrial application.
Highlights
Cemented carbides using tungsten carbide (WC) as main raw materials with high hardness and excellent wear resistance are widely used in drill, mold, needle, cutting tool, and other special processing industries
Some researchers have proved that ultrafine WC powders have better activation in plating binder-phase mental coat on the WC particles
H2 and CH4 were used as reducing and carburizing agents, FIGURE 14 | TEM micrographs of (A) WC1-x powder synthesized by plasma-assisted chemical vapor-phase synthesis (CVS) from WCl6 and (B) WC powders obtained after 5 h of hydrogen heat treatment of WC1-x powders at 900◦C (Sohn et al, 2007) [Figure 1 of Sohn et al (2007), Copyright Elsevier Ltd]
Summary
Ultrafine tungsten carbide (WC) powder refers to WC powders with a particle size between 100 and 500 nm. Researchers have improved the comprehensive properties of WC-based cemented carbides by preparing ultra-fine WC powders. Because of the preparation and application of nanoscale WC powders, ultrafine-grain cemented carbides with excellent hardness and wear resistance have been successfully produced. The preparation methods of ultra-fine WC powder are divided into solid-phase, liquid-phase, and vapor-phase methods according to the state of the raw materials (i.e., the W or C source). The liquid-phase methods could realize the preparation of WC at the temperature between 500 and 800◦C. The purity of WC prepared by vapor-phase method is the highest. The solid-phase reduction carbonization method has potential industrial application
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