热压技术在新型P/M金属基复合材料中的应用

反应烧结是合成颗粒增强金属基复合材料 (MMCs)的新工艺。与传统P M工艺相比 ,通过化学反应在金属基体中产生增强颗粒有诸多优势。由Al TiO2 B经反应烧结制备的Al (Al2 O3+TiB2 )MMCs便是这样一个例子。本文用热压技术将多孔Al (Al2 O3+TiB2 )MMCs致密化并得到了很好的力学性能。Al ( 10 2 %Al2 O3+9 2 %TiB2 ) (体积分数 )的弹性模量、抗弯强度和弯曲最大应变分别为 10 5GPa、50 9MPa和 5 0 %。如果复合材料的成分改变成Al ( 5 4 %Al2 O3+4 9%TiB2 ) (体积分数 ) ,其性能则分别为 89GPa ,311MPa和 8 2 %。文中亦将热压Al (Al2 O3+TiB2 )MMCs的结果与用其他致密化技术处理此材料的结果 ,以及热压其他类似材料的结果进行了比较。

APPLICATION OF HOT PRESSING TECHNOLOGY IN NEW P/M METAL MATRIX COMPOSITIES

Reactive sintering has emerged as a new and promising technique for synthesizing particulate reinforced metal matrix composites(MMCs).It offers significant technical and economic advantages over conventional processing.An example are the porous Al/(Al 2O 3+TiB 2)MMCs obtained by heating powder mixtures of Al+TiO 2+B with TiO 2 and B in stoichiometric ratios for forming TiB 2.In this study,the porous Al/(TiB 2+Al 2O 3)MMCs are densified by hot pressing and good mechanical properties of the composites are obtained.For Al/(10 2vol%Al 2O 3+9.2vol%TiB 2),the Young's modulus,bending strength and maximum strain are 105GPa,509MPa and 5.0% respectively.If the composite composition is changed in to Al/(5.4vol%Al 2O 3+4.9vol%TiB 2) these properties become 89GPa,311MPa and 8.2% respectively.In addition,the densification results obtained by hot pressing are compared with those by alternative techniques;these of other new P/M MMCs which are identically treated by hot pressing,are also compared with.