Abstract：The synthesis law of cubic boron nitride superhard tool material (PCBN composite) was studied, and the
microstructure and properties of PCBN composite were analyzed. PCBN composite sheets were synthesized by
using CBN powder, WC powder and Co powder as raw materials on a hexahedral top press. The results show that
when the sintering temperature is 1 750 ℃, the binding force of WC/Co binder to CBN particles is enhanced, and
the wear ratio of the sample is the largest, which is 7 750. The PCBN composite piece sintered at 1 750 ℃ is made
into a tool to continuously cut nodular cast iron. When the cutting mileage is 20 km, the wear amount (VB) of the
rear face of the PCBN tool is the smallest, which is 0.272 mm. With the increase of temperature, the color deviation
in the sample is less and less, the thickness distribution is more and more uniform, and the flatness is gradually
improved, which indicates that increasing the sintering temperature is helpful to improve the flatness of the CBN
polycrystalline layer in the composite.
2023, Vol. 33 
