超细无粘结相WC基陶瓷的研究进展

综述了近年来国内外超细无粘结相WC基陶瓷的研究状况,无/少粘结相、晶粒的纳米化是研发高性能WC基硬质陶瓷的发展方向之一,其在硬度、高温强度、抗腐蚀、耐磨损等方面较传统硬质合金有明显的优势,具有广阔的应用前景。介绍了机械合金化法、快速碳热还原法、直接碳化法、等离子体化学合成法等超细WC粉末的制备方法,超细无粘结相WC基陶瓷的新型制备技术以及材料的复合改性等内容,并分析了该材料在研究应用过程中面临的困难,认为解决材料的工业化生产、纳米粉末的均匀分散等问题,建立碳氧含量对其性能影响的量化指标是现阶段的研究重点。

Technical Progress of Binderless WC-based Nanostructured Cemented Carbide

The research progress of binderless WC-based nanostructured cemented carbide at home and abroad is reviewed. No/Little binder phase and nanocrystallization is one of the development directions of researching high performance WC-based cemented carbide. The materials have obvious advantages on hardness, high-temperature strength, corrosion resistance and abrasive resistance compared with that of traditional cemented carbide and have broad application prospect. The common process for preparing nanostructured WC powder, such as mechanical alloying, rapid carbothermic reduction, direct carbonization, plasma-chemical synthesis, etc., the novel preparation technology of binderless cemented carbide and compounding modification of materials are introduced. It is considered that some difficulties exist in the process of research and application, such as industrial production, uniform dispersion of nano powder, etc. It is pointed out that the research should concertrated on building the quantitative index between carbon and oxygen contents and the material performance.