不同粘结相碳化钨基硬质合金的研究与应用(Ⅱ)

A Review on WC-based Cemented Carbides with Different Binder Phases(Ⅱ)

硬质合金由高硬度、高熔点的硬质相和韧性好、熔点相对较低的粘结相组成。传统碳化钨基硬质合金的粘结相主要为金属基粘结相,如Co、Ni、Fe或钢基粘结相,因其能有效提高硬质合金的韧性,使合金具有较为优异的力学性能,已经在硬质合金工业中取得了广泛地应用。随着硬质合金工业的发展和工程应用需求的提高,具有潜在应用的新型粘结相引起广泛地科学研究。本文评述了金属间化合物粘结相、高熵合金粘结相及无粘结相硬质合金的制备方法、力学性能及最新研究成果,并将其优异特性与传统WC-Co进行对比,最后对各类粘结相硬质合金的成分、显微组织、力学性能之间的联系进行了简单的阐述。

Cemented carbide is composed of hard phase with high hardness and high melting point and binder phase with good toughness and relatively low melting point. The binder phase of traditional tungsten carbide-based cemented carbide is mainly metal-based bonding phase, such as Co, Ni, Fe or steel-based bonding phase. The binder phase can effectively improve the toughness of cemented carbide and make the alloy have excellent mechanical properties, therefore, it has been widely used in cemented carbide industry. With the development of cemented carbide industry and the improvement of engineering application demand, a new type of binder phase with potential application has caused extensive scientific research. In this paper, the preparation methods, mechanical properties and latest research results of cemented carbide with intermetallic compound bonding phase, high entropy alloy bonding phase and binderless phase are reviewed and compared with traditional WC-Co. In addition, the relationship between composition, microstructure and properties of cemented carbide with various bonding phases are briefly described.