(南昌航空工業(yè)學(xué)院 材料科學(xué)與工程學(xué)院， 南昌 330034)
摘 要: 采用真空變壓力浸滲法制備高體積分?jǐn)?shù)SiCp/Al復(fù)合材料。 結(jié)果表明， 真空變壓力浸滲法具有良好的滲流和凝固條件， 避免了氣體和夾雜物的裹入等問題； 在壓力為0.6 MPa、 保壓時(shí)間為15 min和溫度為1 073 K的條件下， 成功滲透了振實(shí)堆積的單一尺寸SiCp多孔體的最小粒徑為17 μm； 而32 μm的SiCp多孔體浸滲后的復(fù)合材料中SiCp體積分?jǐn)?shù)達(dá)到了60%。 在0.4~0.6 MPa和1 073 K的條件下浸滲15 min， 可滲透的最小SiCp粒徑達(dá)到了10 μm， 其體積分?jǐn)?shù)為56%。 經(jīng)OM、 SEM、 XRD分析表明， 鋁液滲透均勻， 內(nèi)部組織致密， 無明顯的孔洞及夾雜等鑄造缺陷， 界面無脆性Al4C3相生成。
關(guān)鍵字: 真空變壓力浸滲; SiCp/Al復(fù)合材料; 制備; 高體積分?jǐn)?shù)
YAN Qing-song, WAN Hong, ZHENG Yu-hui
（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
