As the earliest cermet, WC-Co-based cermet has been used in many fields due to its high hardness (HRC 80~92) and extremely high compressive strength of 6000 MPa (600 kg.N/mm). However, due to the shortage of W and Co resources, the development and development of tungsten-free cermets have been promoted. Three generations have been made so far: the first generation was during World War II, Germany used Ti-bonded TiC to produce cermets; the second generation was in the 20th century. In the United States, Ford Motor Company added Mo to Ni binder phase to improve the wettability of TiC and other carbides, thereby improving the toughness of the material. The third generation of cermet introduced the nitride into the hard phase of the alloy, changing the single phase to Composite phase. The binder phase is also improved by the addition of the Co phase and other elements. Another new direction in the development of cermets is boride-based cermets. Because of its high hardness, melting point, excellent electrical conductivity and corrosion resistance, boride ceramics make boride-based cermets the most promising cermets.
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