【摘要】 采用近熔态扩散新工艺制备了SiCf/Al(5A02)铝合金基复合材料,采用透射电镜(TEM)和X射线能谱(EDX)分析了界面产物和反应机理。与采用传统固态扩散法制备的样品相对比,样品界面处没有形成脆性相Al4C3,且Al2O3被MgO取代;而固态扩散工艺制得的样品界面处发现针状或块状的Al4C3在C涂层或附着在C涂层上的Al2O3边缘形成,并向基体中生长,破坏了界面的连续性。采用近熔态扩散法制备的样品由于合金元素Mg在从半液态冷却过程中偏聚到界面附近,并与Al2O3发生反应,生成细小的MgO颗粒,阻碍了C的扩散,并抑制了脆性相Al4C3的形成,有利于对界面有害反应的控制。更多还原

【Abstract】 A novel processing called semi-solid diffusing(SSD) method was used to manufactured CVD SiCf /Al(5A02) composite.The interface reactions and the products were compared with that of specimen manufactured by solid diffusing bonding(SDB) method.In the case of specimen manufactured with SSD method,an interface without Al4C3 formed and some MgO particles were detected.However,in the specimen manufactured with SDB,Al4C3 formed and grew into the matrix from the Al2O3 film attached on the carbon coating,which destroy the continuity of interface.Because Mg enriched around the surface of SiC fiber and MgO was formed,the diffusion of C in the interface was decreased and the forming of brittle Al4C3 was restricted,which was beneficial to control the negative reaction of interface.更多还原