Effects of CaB2O4 Content on the Sintering Behavior of Hexagonal Boron Nitride

Yu Xia Cao; Ling Zhong Du; Wei Gang Zhang

doi:10.4028/www.scientific.net/MSF.675-677.131

Paper Titles

Effect of Heating Treatment on the Resistivity of Polycrystalline Silicon
p.113

Preparation of SiC_w/Al₂O₃ Composite Sheets through Gel-Tape-Casting Process
p.119

In Situ High Resolution Transmission Electron Microscopy Studies of High Temperature Behavior of Surface Al₂O₃ Thin Layer on an AlN Particle
p.123

Rapid Synthesis of Molybdenum Disilicide by High-Energy Ball Milling
p.127

Effects of CaB₂O₄ Content on the Sintering Behavior of Hexagonal Boron Nitride
p.131

Pozzolanic Activity of Ceramic Polishing Powder as Cementitious Material
p.135

Silicon Carbide Base Ceramic Fiber Synthesis from Polycarbosilane-Modified Polymethylsilane Blend Polymers by Melt Spinning
p.139

Effects of Rare-Earth Oxides Doping on Microstructures and Properties of Al₂O₃/TiAl Composites
p.143

First Principle Study on Ti₄AlN₃ Properties under Pressure Effect
p.147

HomeMaterials Science ForumMaterials Science Forum Vols. 675-677Effects of CaB2O4 Content on the Sintering...

Effects of CaB₂O₄ Content on the Sintering Behavior of Hexagonal Boron Nitride

Abstract:

CaB2O4 was added into hexagonal boron nitride (hBN) to improve the sintering behaviors of hBN. CaB2O4 and hBN were mixed and then pressed into plates. The plates were sintered at 2000°C for 5h under a N2 ambience. The phase compositions with different CaB2O4 contents were examined with X-ray diffraction analysis. The fracture cross-sections of the hBN plates were investigated by SEM. The apparent density and Rockwell hardness were also measured. The results show that the hBN particles had a plate-like shape and the grain sizes of hBN increased with increasing CaB2O4 contents. The apparent density and Rockwell hardness decreased with increasing CaB2O4 contents. When the CaB2O4 content was 15(wt) %, the hBN has the average grain sizes of 3μm in diameter and 200nm in thickness, the apparent density of 1.06 g/cm3 and the Rockwell hardness of 3, respectively.