Abstract:

A kind of ceramic matrix cubic boron nitride (cBN) composites for bearing interfacial precision grinding was prepared by sintering process. The microstructure and element distribution at the interfaces were studied by scanning electron microscope and electron probe analysis. The grinding properties were tested by bearing interfacial grinder. The results show that with the increase of sintering temperature, the composition diffusion depth at the interfaces increases slowly, and the interfacial binding strength increases more rapidly than the strength of ceramic matrix. At the sintering temperature of 750 ℃, interfacial binding strength of composites matches well with the matrix strength. With the feed rate is 8 μm/r and the abrasion volume ratio is 310-370, the ceramic matrix cBN composites show good grinding performance with high sharpness and wear resistance. The wear, rupture, exfoliation of cBN and the fracture of ceramic matrix material were observed after grinding.

Key words: ceramic matrix composite, cubic boron nitride, sintered temperature, interfacial, grinding performance