組織與性能的影響
(武漢科技大學(xué) 材料與冶金學(xué)院，武漢 430081)
摘 要: 采用無壓自浸滲法制備SiCp/Al復(fù)合材料。研究了Mg含量對(duì)SiCp與Al之間浸潤(rùn)性的影響；探討了Mg含量對(duì)SiCp/Al復(fù)合材料的組織與性能的影響及其作用機(jī)理。結(jié)果表明，加入的Mg與SiCp表面的氧化物薄膜和鋁基體發(fā)生反應(yīng)，生成物會(huì)阻止SiCp與Al基體反應(yīng)生成Al4C3脆性相，同時(shí)SiCp表面的微反應(yīng)也增加了基體與SiCp的結(jié)合強(qiáng)度，改善 了基體與SiCp之間的浸潤(rùn)性，從而使復(fù)合材料的耐磨性提高了3～4倍。
關(guān)鍵字: 無壓自浸滲；SiCp/Al復(fù)合材料；Mg
properties of SiCp/Al composite
fabricated by pressure less infiltration
（College of Materials and Metallurgy, Wuhan Science and
Technology University, Wuhan 430081, China）
Abstract:The SiCp/Al composites was fabricated by pressure less infiltration method, the behavior of different fraction of Mg addition on the microstructure an d mechanical properties was investigated. It indicates that MgAl2O4, a reaction product at the surface between oxide films of SiC and the matrix, can hinder the fragile Al4C3 which could be produced between SiC and the matrix directly. On the other hand it enhances the bonding between SiC and the matrix and improves the properties of the composites at the same time.
Key words: pressureless infiltration；SiCp/Al composites；Mg
