摘要
研究了在热压条件下制备(SiC,TiB2)/B4C复合材料的烧结机理。认为烧结助剂的加入使本体系成为液相烧结,同时粉料的微细颗粒对复合材料的烧结致密也有重要贡献。分析和测量了制取的复合材料的相组成、显微结构和力学性能。结果表明,采用B4C与Si3N4和少量SiC、TiC为原料,Al2O3+Y2O3为烧结助剂,在烧结温度1800～1880℃,压力30MPa的热压条件下烧结反应生成了SiC、TiB2和少量的BN,制取了(SiC,TiB2)/B4C复合材料。所形成的晶体显微结构为层片状。制得的试样的硬度、抗弯强度和断裂韧性分别可达HRA88.6、540MPa和5.6MPa·m1/2。
The sintering mechanism was investigated for (SiC, TiB2)/B4C matrix composites fabricated under hot pressing conditions. It is believed that the sintering mechanism is liquid phase sintering caused by the addition of the sintering additive in this research system. The micro particles in the powders in the system worked out a significant contribution to the sintering compaction of the composites. And the phase composition, microstructure, and mechanical properties of the composites were measured and analyzed. The results show that SiC, TiB2 and a bit of BN are produced by sintering reaction at sintering temperature 1800-1880°C, pressure 30 MPa with original powders B4C, Si3N4, a little of SiC and TiC and the sintering additive of (Al2O3+Y2O3). The microstructure of the crystal formed in the system is sandwich. The hardness, bending strength and fracture toughness of the fabricated samples are HRA88.6, 540 MPa and 5.6 MPa·m1/2, respectively.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第4期129-133,共5页
Acta Materiae Compositae Sinica
基金
教育部博士后基金(20020422001)
山东省重点自然科学基金(Z2002F02)资助
关键词
复合材料
反应烧结
碳化硼
碳化硅
硼化钛
Additives
Bending strength
Boron carbide
Fracture toughness
Hardness
Hot pressing
Phase composition
Silicon carbide
Silicon nitride
Sintering
