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Structural Control of Multiphase Silicon Carbide Ceramics with Composite Particles

复合颗粒多相碳化硅陶瓷的结构控制

基本信息

批准号：
05650657
负责人：
HOJO Junichi
金额：
$ 1.34万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650657/
关键词：
Silicon carbide Boron nitride Titanium boride Composite Nanocomposite Thermal shock resistance Fracture toughness Composite particle 破壊靱性

项目摘要

Composite particles were used for producing SiC-BN nanocomposites, to which TiB_2 particles and SiC whiskers were further added. The following results were obtained with respect to the structure and properties of the multiphase silicon carbide ceramics.1. Fine SiC-BN composite particles (<0.1mum) were prepared by a high-temperature vapor phase reaction in Si(CH_3)_4-BCl_3-NH_3-H_2 system. Nanocomposites were produced by hot-pressing of the composite powder, in which fine BN particles (<0.5mum) were dispersed in SiC matrix. They exhibited an excellent thermal-shock resistance but the fracture toughness was low.2. TiB_2 particles (2mum) or SiC whiskers (diameter 1.2mum, length 40mum) were added to SiC-BN composite powder and the mixtures were hot-pressed. The multiphase composites exhibited an improved fracture toughness. The thermal shock resistance was somewhat lowered but higher than that of monolithic SiC.3. The composite powder was also prepared by the deposition of BN from BCl_3-NH_3-H_2 gas phase on SiC particles (0.3mum) in a fluidized bed. The improvement of thermal shock resistance was observed in the sintered body of the composite powder. SiC-TiB_2-BN composite powder was prepared by this method to improve the fracture toughness.As described above, the ceramic materials with excellent thermal-shock resistance and fracture toughness can be produced by the control of the structure of multiphase composite with composite powders.

采用复合颗粒制备SiC- bn纳米复合材料，并在复合颗粒中加入TiB_2颗粒和SiC晶须。对多相碳化硅陶瓷的结构和性能进行了研究。在Si(CH_3)_4-BCl_3-NH_3-H_2体系中采用高温气相反应法制备了SiC-BN复合颗粒（<0.1mum）。通过热压法制备了纳米复合材料，其中细小的BN颗粒（<0.5mum）分散在SiC基体中。它们具有优良的抗热震性能，但断裂韧性较低。将TiB_2颗粒（2mum）或SiC晶须（直径1.2mum，长度40mum）加入到SiC- bn复合粉末中，进行热压混合。多相复合材料具有较好的断裂韧性。耐热冲击性能略低于单片sic 3，但高于单片sic 3。在流化床中，将BCl_3-NH_3-H_2气相的BN沉积在SiC颗粒（0.3mum）上，制备了复合粉体。在烧结体中观察到复合粉末的抗热震性能的提高。采用该方法制备了SiC-TiB_2-BN复合粉末，提高了其断裂韧性。如上所述，利用复合粉末控制多相复合材料的结构，可以制备出具有优异耐热冲击性能和断裂韧性的陶瓷材料。