论文部分内容阅读
采用无压渗透新工艺制备了Ａｌ２Ｏ３ 颗粒增强铝基复合材料，叙述了无压渗透工艺过程．通过金相显微镜、Ｘ射线衍射（ＸＲＤ） 、扫描电镜（ＳＥＭ） 、能谱（ＥＤＳ） 等手段，对（Ａｌ２ Ｏ３）ｐ／Ａｌ 的微观结构进行了分析；测试了铝基复合材料的力学及热物理性能．结果表明，铝基复合材料显微结构致密、渗透完全．在Ａｌ２Ｏ３ 与Ａｌ 的界面处，基体合金中的镁与增强剂Ａｌ２Ｏ３ 反应，原位生成ＭｇＡｌ２Ｏ４ 尖晶石晶体，其质量分数为４ ．１ ％ ．制造态复合材料的极限拉伸强度为３７８ ＭＰａ，拉伸模量为１２１ ．６ ＧＰａ，断裂延伸率为１ ．９６ ％ ，室温下导热系数为３０ ．３８ Ｗ／（ｍ·Ｋ） ，在５００ ℃时为３９ ．６７ Ｗ／（ｍ·Ｋ） ．在１０８０ ℃、２０ ｓ 的氧乙炔焰下，３ ｍ ｍ 厚的（Ａｌ２ Ｏ３）ｐ／Ａｌ 无烧蚀，试样表面完好，未破碎．
Al2O3 particle reinforced aluminum matrix composite was prepared by pressureless infiltration process. The pressureless infiltration process was described. The microstructure of (Al 2 O 3) p / Al was analyzed by means of metallographic microscope, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The mechanical properties of aluminum matrix composites And thermal physical properties. The results show that the microstructure of aluminum matrix composites is dense and infiltrated completely. At the interface of Al2O3 and Al, the magnesium in the matrix alloy reacts with Al2O3, and the MgAl2O4 spinel crystals are formed in situ with a mass fraction of 4. 1%. The ultimate tensile strength of the fabricated composite was 378 MPa and the tensile modulus was 121. 6 GPa, elongation at break of 1. 96%, thermal conductivity at room temperature 30. 38 W / (m · K), 39 at 500 ° C. 67 W / (m · K). Under the oxygenacetylene flame of 1080 ℃ for 20 s, the thickness of (Al 2 O 3) p / Al was 3 m, and the surface of the sample was intact and unbroken.