化学プロセスを用いた窒化ホウ素分散ナノ複合材料の作製とその特性

（論文）

抄録

Hexagonal boron nitride (h-BN) dispersed nanocomposites were fabricated through a chemical process involving sintering of matrix ceramic powders covered partly with turbostratic BN (t-BN), which was synthesized by the reduction of a mixture of boric acid and urea precipitating on the matrix ceramic powder during drying after wet-ball milling. Silicon carbide (SiC), silicon nitride (Si₃N₄), alumina (Al₂O₃) and aluminum nitride (AlN) were employed as matrix for h-BN dispersed nanocomposites. The nano-sized h-BN particles were found to be homogeneously dispersed within the matrix grains as well as at grain boundaries, which is typical of nanocomposite structures. As a result, the present nanocomposites showed unique and excellent properties such as high strength, low Young's modulus, high thermal shock resistance, and good machinability.