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采用气压浸渗法制备SiC/A356/FeNi50复合材料。SiC/A356/FeNi50的界面由FeNi50反应层、Al反应层和Al合金基体组成。(Fe,Ni)4(Al,Si)13和(Fe,Ni)2(Al,Si)5作为主要的界面反应产物分别存在于FeNi50反应层和Al反应层中。讨论了不同浸渗温度和保温时间下的材料弯曲行为。结果表明:670℃时的抗弯强度是所有温度下的最好的,与Al合金的(223 MPa)接近,并达到了SiC/A356抗弯强度的46%。由于界面中脆性相的存在而导致抗弯强度的下降。合适的保温时间能使预制体温度更加均匀,减少空洞的形成,这对提高复合材料的抗弯强度具有重要意义。
Preparation of SiC / A356 / FeNi50 Composites by Pressure Infiltration Method. The interface of SiC / A356 / FeNi50 consists of FeNi50 reaction layer, Al reaction layer and Al alloy matrix. (Fe, Ni) 4 (Al, Si) 13 and (Fe, Ni) 2 (Al, Si) 5 are present in the FeNi50 reaction layer and the Al reaction layer as the main interfacial reaction products, respectively. The bending behavior of materials under different infiltration temperature and holding time is discussed. The results show that the bending strength at 670 ℃ is the best at all temperatures, which is close to that of Al alloy (223 MPa) and reaches 46% of the bending strength of SiC / A356. The bending strength decreases due to the presence of brittle phase in the interface. The proper holding time can make preform temperature more uniform and reduce the formation of voids, which is of great significance to improve the flexural strength of composites.