摘要
以普通商用TiO2为原料,与铝粉、碳化硼进行自蔓延(SHS)高温合成TiB2/Al2O3复合材料,通过差热和X射线衍射分析,确定了TiO2、Al及B4C的反应机制,得到了生成TiB2/Al2O3复合粉体的最佳工艺条件。测定了TiB2/Al2O3复合粉体相关的力学性能,得到材料的抗压强度为87.2MPa,抗弯曲强度为104.3MPa。SEM观察发现生成相中存在大量的气相或气孔,生成物微观区域不太均匀,材料的断裂形式主要为脆性断裂,生成物的颗粒尺寸为亚微米级。
TiB2/Al2O3 composite powder was synthesized using commercial TiO2 as raw material with AI powder and B4C by self-propagating high-temperature synthesis （SHS） method. Reaction mechanism among TiO2, AI and B4C was determined by DTA analysis and some mechanical properties of TiB2/Al2O3 composite powder were also measured. Mechanical test showed that its compression strength was 87.2 MPa and bending strength was 104.3 MPa. SEM analysis indicated that lots of gas phase or pore existed in product and micro-region of product distributed uniformly. Main fracture mode of the samples was brittle fracture and obvious cleavage fracture was observed. Grain size of product was submicron order.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期98-101,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50572017)
黑龙江省自然科学基金(E200525)
