采用Ｔｉ－Ａｌ－Ｂ和ＴｉＯ２－Ａｌ－Ｂ两个体系利用反应热压方法制备了原位ＴｉＢ２粒子增强Ａｌ（ＴｉＢ２／Ａｌ）和原位Ａｌ２Ｏ３，ＴｉＢ２粒子复合增强Ａｌ（Ａｌ２Ｏ３．ＴｉＢ２／Ａｌ）两种复合材料，研究表明，对于Ｔｉ－Ａｌ－Ｂ体系，除ＴｉＢ２外还有一定量的尺寸可达几十微米的Ａｌ３Ｔｉ生成，原位形成的ＴｉＢ２大部分为０．１－５０μｍ的块状粒子，此外还有少量长宽比大于４的棒状ＴｉＢ２．对于ＴｉＯ２－Ａｌ－Ｂ体系，基本上没有Ａｌ３Ｔｉ生成，原位形成的Ａｌ２Ｏ３和ＴｉＢ２为００５－２０μｍ的近似等轴状的粒子．对两种复合材料差异的微观结构给出了解释．
In situ TiB2 particulate reinforced Al(TiB2/Al) and in situ Al2O3, TiB2 particulates mixture-reinforced Al(Al2O3. TiB2/AI) composites were fabricated by reaction pressing of Ti-AI-B and TiO2-Al-B systems. It is indicated that for the Ti-Al-B system, a certain amount of Al3Ti with a size of several ten μm formed in addition to TiB2, most of the in situ formed TiB2 are block-like particulates with a size of 0.1─5.0 μm, and few TiB2 are rod-like and have an aspect ratio of greater than 4. For the TiO2-Al-B system, the formation of Al3Ti is basically inhibited, and the in situ formed Al2O3 and TiB2 are approximate equal-axial particulates with a size of 0.052.0 μm. The different microstructures of two composites are accounted for.
参考文献
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