Affiliation:
1. College of Materials Science and Engineering Guilin University of Technology Guilin China
2. Guangxi Key Laboratory of Superhard Material China Nonferrous Metal (Guilin) Geology And Mining Co., Ltd. Guilin Guangxi China
Abstract
AbstractPolycrystalline cubic boron nitride (PcBN) composites were synthesized in situ with TiB2, TiN, and Sialon as binders under ultrahigh temperature (1550°C) and high pressure (5.5 GPa). X‐ray diffractometry, universal testing machine, field emission scanning electron microscopy, and transmission electron microscopy were used to study the effect of Sialon content (0%, 20%, 40%, 60%, and 80% by mass of binder) on the phase composition, microstructure, and mechanical properties of PcBN composites. The results show that the main phases in the system are lamellar TiN, needle‐rodlike TiB2, and irregular long‐rodlike Sialon. Some TiB2 grows along the (1 0 −1 0) face, and Sialon grows along the (0 0 0 1) face. The density and mechanical properties of the sintered product are significantly improved due to the formation of Sialon. When the content of Sialon is 60%, the binder is uniformly distributed, the cBN interface is well bonded, and the density is the highest. At this time, the strength reaches the maximum 34.57 GPa, the fracture toughness is 6.82 MPa m1/2, and the flexural strength reaches the maximum 870.79 MPa. On the whole, cBN composites have excellent prospects for future applications in cutting inserts due to their excellent mechanical properties.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Marketing,Condensed Matter Physics,Ceramics and Composites