(南昌航空工业学院 材料科学与工程学院， 南昌 330034)
摘 要: 采用真空变压力浸渗法制备高体积分数SiCp/Al复合材料。 结果表明， 真空变压力浸渗法具有良好的渗流和凝固条件， 避免了气体和夹杂物的裹入等问题； 在压力为0.6 MPa、 保压时间为15 min和温度为1 073 K的条件下， 成功渗透了振实堆积的单一尺寸SiCp多孔体的最小粒径为17 μm； 而32 μm的SiCp多孔体浸渗后的复合材料中SiCp体积分数达到了60%。 在0.4~0.6 MPa和1 073 K的条件下浸渗15 min， 可渗透的最小SiCp粒径达到了10 μm， 其体积分数为56%。 经OM、 SEM、 XRD分析表明， 铝液渗透均匀， 内部组织致密， 无明显的孔洞及夹杂等铸造缺陷， 界面无脆性Al4C3相生成。
关键字: 真空变压力浸渗; SiCp/Al复合材料; 制备; 高体积分数
（School of Materials Science and Engineering,
Nanchang Institute of Aeronautical Technology, Nanchang 330034, China）
Abstract: The high volume fraction SiCp/Al composites were fabricated by vacuum-adjustable pressure infiltration process. The results show that infiltration and solidification are effectively promoted by vacuum-adjustable pressure infiltration process, which also avoids the gas and the inclusion binds. The preform of a single minimum SiC particle with size of 17 μm and volume fractions of 58% is successful infiltrated under pressure of 0.6 MPa, holding time of 15 min and temperature of 1 073 K. In the meantime, SiCp particles with size of 32 μm and volume fraction of 60% are obtained. Furthermore, the single SiC particles with size of 10 μm and volume fractions of 56% was successful infiltrated for 15 min under condition of 1 073 K and 0.4-0.6 MPa. The analyses results by OM, SEM, XRD indicate that SiC particles are uniformly distributed in the aluminum matrix without casting defects, such as bubble, shrinkage, inclusion, and the brittle Al4C3 phase is not found in the interfacial region.
Key words: vacuum-adjustable pressure infiltration; SiCp/Al composites; preparation; high volume fraction
