(吉林大學(xué) 材料科學(xué)與工程學(xué)院， 長春 130025)
摘 要: 對擠壓鑄造制成的飛灰顆粒增強(qiáng)ZL109復(fù)合材料在不同條件下的的摩擦磨損行為進(jìn)行了研究。結(jié)果表明： 飛灰顆粒的加入可提高鋁合金材料的耐磨性， 復(fù)合材料同基體合金相比， 摩擦因數(shù)也較低。 在摩擦磨損過程中， 在較低載荷下復(fù)合材料的摩擦表面形成一穩(wěn)定的摩擦轉(zhuǎn)移層，該轉(zhuǎn)移層的存在可以起到降低摩擦因數(shù)的作用。 在較高載荷下由于該摩擦轉(zhuǎn)移層遭到破壞， 從而影響了其減摩作用的發(fā)揮。 鑲嵌在基體中的飛灰顆粒在摩擦過程中主要起到承受載荷、限制對磨材料與鋁基體直接接觸的作用。 脫落的飛灰顆粒可以起到“滾珠”的作用， 在摩擦表面形成“三體”摩擦， 從而起到減摩的作用。
關(guān)鍵字: 鋁基復(fù)合材料； 飛灰顆粒； 耐磨性； 磨損機(jī)制
（Department of Materials Science and Engineering，
Jilin University， Changchun 130025, China）
Abstract:The friction and wearing behavior of ZL109/ fly ash particles reinforced MMCs made by squeeze-casting were investigated under different conditions. The results indicate that the wear resistance of the composites is improved as fly ash particles are mixed. Comparing the composites with its matrix alloy, the formers have the lower friction coefficient. Under lower loads, a tribolayer is formed on the worn surface, which contributes to the decreasing of the friction coefficient. Under higher loads, the tribolayer is destroyed and then affects its effect of decreasing the friction coefficient. Fly ash beset in the MMCs acts as supporting load and limiting the direct contact between Al matrix and the steel slider. Fly ash falling off acts as “rolling ball”, forms the “three body” friction on the worn surface, which contributes to improve the wearing resistance of the MMCs.
Key words: aluminum matrix composites; fly ash particles; wearing resistance; wear mechanism
