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Abstract The effects of the content of reinforcement phase, the type and content of metal bonding phase on the
phase composition, microstructure and mechanical properties of TiB2 based cutting tools were studied. The results
show that TiB2 based cutting tools with different HfC content are mainly composed of TiB2, HfC, a small amount of
Ni and MoNi4 phases; in the sintering process, Ni will react with Mo to form a small amount of MoNi4 phases.
When the HfC content reaches 20%, TiB2 based cutting tools have the highest bending strength, fracture toughness
and high hardness. Compared with the samples with pure Ni as the metal phase, pure Co as the metal phase and Ni
+ Mo as the metal phase, the TiB2 and HfC phases in the samples with Ni and Co as the metal phase have more uniform
distribution and better wetting effect. At this time, the bending strength, fracture toughness and hardness of
TiB2 based tool materials are 834 MPa, 9.50 Mpa·M1/2 and 22.92 Gpa, respectively, which has the best comprehensive
mechanical properties.
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Received: 15 February 2020
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2022, Vol. 32 
