Abstract
h-BN/feldspar composite was sintered without pressure at low temperature in air. h-BN and feldspar powders were mixed at the volume ratio of 1:1. The h-BN powder contained 40mass% B2O3. The feldspar was pre-melted and then milled. The melting point of as-received feldspar was nearly 1500 K. The mixed powder was sintered without pressure at 1473 K in air. The bending strength of the compact was 59 MPa. This value was higher than that of the compact sintered using as-received feldspar. It was also higher value than that of the compact, which contained the pre-melted feldspar, sintered at 1573 K. Additionally, it would be important using oxygen-enriched h-BN powder which contains B2O3 at not only the surfaces but also insides.
