AlN-BN composite ceramics were fabricated by sintering a mixture of fine AlN and BN powders containing Y2O3 as the sintering aid at 1850°C in nitrogen atmosphere. BN contents up to 15 vol% were studied. The heat treatment of sintered AlN-BN composite was performed at 1800°C in nitrogen atmosphere. BN particles in the composite showed large anisotropic grain growth during sintering, and the shape of grown BN particles appeared to be plate-like. Moreover, the heat treatment gave very interesting microstructures of the composite, in which many more interfaces between AlN grains were observed and most of the secondary phase was located at triple points of AlN grains. The resultant microstructural change is thought to be due to the change in the ratio of interfacial energy (between grain and liquid) and grain boundary energy (between grains).
|Number of pages||4|
|Publication status||Published - 1999|
|Event||Proceedings of the 1998 4th International Conference on Nanostructured Materials (NANO '98) - Stockholm, Swed|
Duration: 1998 Jun 14 → 1998 Jun 19