摩擦磨損性能的影響
于思榮1, 代漢達(dá)1, 徐國峰2
(1. 吉林大學(xué) 材料科學(xué)與工程學(xué)院， 長春 130025;
2. 長春三佳化油器有限公司， 長春 130117)
摘 要: 利用擠壓鑄造法制備了Al2O3+C/ZL109短纖維混雜金屬基復(fù)合材料，并探討了Al2O3纖維體積分?jǐn)?shù)為12%時(shí)，C纖維含量對該混雜復(fù)合材料摩擦磨損性能的影響。結(jié)果表明：隨著C纖維體積分?jǐn)?shù)的增加，復(fù)合材料的摩擦因數(shù)和磨損率逐漸降低。12％Al2O3和4％C短纖維的協(xié)同作用使復(fù)合材料從輕微磨損到急劇磨損的臨界轉(zhuǎn)變載荷比基體合金提高了１倍。當(dāng)載荷低于臨界載荷時(shí)，復(fù)合材料的主要磨損機(jī)制為犁溝磨損和層離，C纖維的加入有利于磨損表面裂紋尺寸的減小。但隨著載荷的逐漸增加并發(fā)生嚴(yán)重磨損時(shí)，基體和復(fù)合材料的磨損機(jī)制均為嚴(yán)重的粘著磨損甚至局部熔化磨損。
關(guān)鍵字: 金屬基復(fù)合材料； 混雜； 摩擦磨損； 碳短纖維
Al2O3+C /ZL109 hybrid composites
DAI Han-da1, XU Guo-feng2
（１. School of Materials Science and Engineering,
Jilin University， Changchun 130025， China;
2. Changchun San Jia Carburetor Limited Corporation， Changchun 130117， China）
Abstract:Al2O3+C/ZL109 short fibers reinforced hybrid metal matrix composites were fabricated by squeeze casting．The effect of carbon fiber content on friction and wear properties of the hybrid composites with fixed Al2O3 fiber volume fraction 12% was investigated．The results show that carbon fiber is of self-lubricant to some degree， coefficient of friction and wear rate of the hybrid composites decrease with the increase of carbon fiber volume fraction．Tribological property of the hybrid composites with incorporation of carbon short fiber is ameliorated and the wear property is improved．The transition load from mild wear to severe wear of the hybrid composites improves markedly because of mutual effect of Al2O3 and carbon short fibers， the value is larger by one fold than that of the matrix． The dominant wear mechanisms of the composites are grooving and delamination during the phase of mild wear when the experimental load is smaller than the transition load．Incorporation of carbon short fiber is in favor of decrease of microcracks size on worn surface． The dominant wear mechanisms of matrix and composites will be shifted to severe adhesion and even local melt wear with the increase of load．
Key words: metal matrix composites; hybrid; friction and wear; carbon short fiber
