噴射成形Al22Si5Fe3Cu1Mg的高溫耐磨機(jī)制

噴射成形Al22Si5Fe3Cu1Mg的高溫耐磨機(jī)制Wear resistance mechanism of spray-formed Al22Si5Fe3Cu1Mg at high temperature

采用常規(guī)鑄造和噴射成形兩種工藝制造Al22Si5Fe3Cu1Mg高硅鋁合金，研究磨損溫度對合金摩擦行為和磨損機(jī)理的影響。結(jié)果表明：由于噴射成形高硅鋁合金具有組織細(xì)小、成分均勻等特征，在磨擦過程中表現(xiàn)出更好的抗磨損性能。合金的磨損機(jī)制隨著溫度的升高而發(fā)生轉(zhuǎn)變，低于臨界溫度時(shí)為磨粒和黏著磨損混合形式，高于臨界溫度后轉(zhuǎn)變?yōu)閯儗幽p。合金在高溫下磨擦?xí)r，由于氧化速度較快，形成的氧化物改善合金的抗磨損性能，但存在一個(gè)臨界溫度，當(dāng)超過臨界溫度時(shí)，兩種工藝下的合金均由輕微磨粒和黏著磨損混合形式轉(zhuǎn)變?yōu)閲?yán)重的剝層磨損，噴射成形合金在不同高溫下的抗磨損性能均顯著優(yōu)于鑄造合金的，且其磨損機(jī)制轉(zhuǎn)變臨界溫度比常規(guī)鑄造合金的高約100 ℃。

The effects of temperature on friction behavior and wear mechanism for high-silicon aluminum alloy were systematically studied by comparing two processes of conventional cast and spray-formed for manufacturing Al22Si5Fe3Cu1Mg alloy. The result shows that Al22Si5Fe3Cu1Mg alloy by spray-form process shows better abrasion and wear properties than that by conventional casting. The wear mechanism changes with temperature, which shows mixed wear of abrasive and adhesive at temperature lower than the critical temperature and shows delamination wear at temperature higher than the critical temperature. When explored at high temperature, the formation of oxidation improves the wear resistance for the Al22Si5Fe3Cu1Mg alloy due to the fast oxidation and there exiting a critical temperature when wear increases significantly. The wear mechanism of two materials changes into delamination wear with wear rate increasing dramatically by low wear. Notably, the Al22Si5Fe3Cu1Mg alloy by spray-formed process shows superior wear resistance than that from conventional cast both at high and low temperatures. Moreover, the Al22Si5Fe3Cu1Mg alloy by spray-formed process has higher critical temperature of wear mechanism than that by conventional cast.

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