摘要
将压力铸造（Ｓｑｕｅｅｚｅ－Ｃａｓｔｉｎｇ）与燃烧合成（Ｃｏｍｂｕｓｔｉｏｎ－Ｓｙｎｔｈｅｓｉｓ）相结合，利用ＴｉＯ２与Ａｌ之间的反应，成功地制备了金属相Ａｌ含量不同的Ａｌ２Ｏ３－Ａｌ３Ｔｉ－Ａｌ原位复合材料系列。运用三点弯曲方法测试了复合材料的抗弯曲强度和弹性模量。结果表明：复合材料具有较高的弯曲强度（４１０～４９０ＭＰａ）和弹性模量（１５６～２１６ＧＰａ），随着金属相Ａｌ含量的增加，弯曲强度开始有所升高，当Ａｌ体积百分数超过４０％后便明显下降。而弹性模量始终呈降低趋势，复合材料的高强度源于反应生成细小的Ａｌ２Ｏ３颗粒及Ａｌ３Ｔｉ相的增强作用。
Fully dense Al 2O 3 Al 3Ti Al composites were in situ reaction processed by combining squeeze casting technique with combustion synthesis utilizing the reaction between TiO 2 and pure Al. The in situ reaction formed spherical Al 2O 3 particles with a size of 0.1μm to 1μm are uniformly distributed in the matrix. The composites possess high flexural strength (410～490MPa) and elastic modulus (156～216GPa). With increasing content of Al in the composite, the bending strength begins to increase slightly and then decreases when the volume fraction of Al exceeds 40%. The elastic modulus of the composites decreases with increasing content of Al. The high flexural strength of the in situ composites is mainly attributed to the dispersion strengthening of fine Al 2O 3 particles and Al 3Ti phase.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
1998年第4期48-52,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金
中国博士后科学基金
中科院上硅所开放室基金
关键词
反应自生
弯曲强度
铝基
氧化铝
复合材料
flexural strength, in situ reaction, Al 2O 3 Al 3Ti Al composites
