(南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室，南昌 330063)
摘 要: 選用的增強(qiáng)體為先驅(qū)體法制備的束絲SiC纖維(KD-Ⅱ型)，采用真空氣壓浸滲法制備體積分?jǐn)?shù)為40%、基體合金分別為ZL102、ZL114A及ZL205A合金的連續(xù)SiCf/Al復(fù)合材料，并用NaOH溶液萃取出SiC纖維，研究基體合金對(duì)連續(xù)SiCf/Al復(fù)合材料微觀組織和拉伸強(qiáng)度的影響。結(jié)果表明：基體合金對(duì)連續(xù)SiCf/Al復(fù)合材料的微觀組織及力學(xué)性能有顯著地影響。其中，SiCf/ZL102復(fù)合材料纖維分散均勻和致密，SiCf/ZL114A復(fù)合材料存在少量的纖維團(tuán)聚，而SiCf/ZL205A復(fù)合材料存在明顯的偏聚和微孔缺陷；基體ZL102、ZL114A及ZL205A復(fù)合材料的平均拉伸強(qiáng)度分別為615.7、475.9和385.1 MPa，差別較大；同時(shí)，從基體ZL102、ZL114A及ZL205A的復(fù)合材料中萃取出SiC纖維的平均拉伸強(qiáng)度分別為原絲的50.94%、41.51%及25.09%；在浸滲過(guò)程中，纖維損傷和分布是導(dǎo)致不同基體復(fù)合材料力學(xué)性能差異的關(guān)鍵因素。
關(guān)鍵字: 真空氣壓浸滲；萃取纖維；SiC纖維；拉伸強(qiáng)度
（National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,
Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The vacuum gas pressure infiltration was performed for the continuous SiCf/Al composite with the volume fraction of 40%, of which the reinforced material was SiC fiber fabricated by precursor method, the matrix alloys were ZL102, ZL114A and ZL205A alloys, SiC fibers were extracted using NaOH solution, both the effects of matrix alloy on the microstructure and tensile strength of continuous SiCf/Al composites were studied. The results show that matrix alloy has a significant effect on the microstructure and mechanical properties of continuous SiCf/Al composites. Fibers of SiCf/ZL102 composite are uniformly dispersed and dense, SiCf/ZL114A composites have small amounts of fiber reunion, but SiCf/ZL205A composites have obvious segregation and microporous defects. Average tensile strengths of the composites with matrix of ZL102, ZL114A and ZL205A are 615.7, 475.9 and 385.1 MPa, respectively, which are quite different. Meanwhile, average tensile strength of SiC fibers extracted from composites with matrix of ZL102, ZL114A and ZL205A are 50.94%, 41.51% and 25.09% of the raw silk, respectively. In the infiltration process, fiber damage and fiber distribution are the key factors leading to differences in composite mechanical properties of the different matrix.
Key words: vacuum gas pressure impregnation; extracted fibers; SiC fiber; tensile strength
