摘要
通过对不同Fe含量的Ti+B +Fe体系绝热温度计算和试样温度有限元计算 ,确定了 (TiB2 +Fe) /Fe梯度材料各层合理的厚度 ,并采用SHS/QP技术制备了 (TiB2 +Fe) /Fe梯度材料。电子探针分析表明 (TiB2 +Fe) /Fe梯度试样中各层间没有了明显的界面 ,沿厚度方向由富陶瓷相向富金属相连续转变。背散射电子像分析表明从富陶瓷侧到富金属侧 ,材料的显微结构也是梯度变化的。SEM分析表明 ,从富陶瓷层到富金属层 ,TiB2 晶粒减小。
The reasonable thickness was determined by the adiabatic temperature calculation of Ti+B+Fe system and the finite element calculation of the temperature in the samples for different layers of (TiB2+Fe) functionally graded material (FGM) composites. The (TiB2+Fe)/Fe FGM composites were fabricated by the self propagating high temperature synthesis-quick pressure SHS/QP method. But when the mass fraction of Fe reaches 80%, a little of TiB2 can be formed in the composite. EPMA analyses show that the composition of FGM products changes gradually across the samples without a distinct interface between the different layers. Back-scattered electron images show that the microstructure of the composites also changed gradually. The size of TiB2 grains decreases gradually from the region rich in TiB2 to the region rich in Fe as showed by SEM.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第4期438-442,共5页
Journal of The Chinese Ceramic Society
基金
国家杰出青年科学基金资助项目 (5 992 5 2 0 7)~~
