その場反応により生成されたTiN粒子分散Si_3N_4基複合材料

概要

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Si_3N_4 matrix composite reinforced with 5 vol% TiN particles was fabricated by the in-situ reaction: 4TiO_2 +4AlN→4TiN+2Al_2O_3+O_2, followed by hot-pressing. The internal TiN formation reaction was studied using TiO_2 powders with three different particle sizes (0.28, 0.35 and 1.19μm). The reaction is likely to start from nearly 1150℃ and finishes at 1450℃, before the Si_3N_4 matrix is sintered, and TiN formation is confirmed from the unit cell dimension. TiN particle sizes in the composites sintered at 1600℃ and 1850℃ were measured. When the TiO_2 particle size was large (1.19μm), the particle crumbled into fragments and underwent nitridation to TiN with a smaller size than that of the original TiO_2. Smaller TiO_2 (0.28μm) was converted into TiN particles of nearly the same size. These results suggest that the in situ TiN formation proceeds through nitridation of TiO_2 particles.
社団法人日本セラミックス協会の論文
1997-04-01