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2A06鋁合金表面微弧氧化陶瓷層摩擦學(xué)特性
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Tribological Performance of Ceramic Composite Coatings Obtained by Microarc Oxidation on 2A06 Aluminum Alloy
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    摘要:

    采用微弧氧化技術(shù)，以硅酸鹽為主要電解液，在2A06鋁合金表面制備出高硬度、高耐磨性的微弧氧化陶瓷膜。用掃描電鏡觀測(cè)膜層的顯微結(jié)構(gòu)，用X射線衍射分析其相組成，并對(duì)膜層進(jìn)行耐磨損和抗沖蝕試驗(yàn)。結(jié)果表明，氧化時(shí)間越長(zhǎng)，2A06鋁合金表面陶瓷層越厚，陶瓷層粗糙度也越高。陶瓷層由過渡層、致密層和疏松層組成。過渡層與基體和致密層結(jié)合緊密。致密層的相組成主要為α-Al2O3、γ-Al2O3，疏松層的相組成主要為α-Al2O3、γ-Al2O3以及Al6Si2O3。致密層中的α-Al2O3相的含量遠(yuǎn)高于疏松層。從試樣邊緣到試樣中心硬度逐漸降低，最高硬度出現(xiàn)在試樣表面邊緣向內(nèi)5~20 mm處，平均HV硬度可達(dá)20.96 GPa。2A06鋁合金的耐磨性比較差，磨輪轉(zhuǎn)速從100 r/min增至400 r/min時(shí)，磨損量不斷增加且呈線性分布。微弧氧化制備的陶瓷層磨損量在磨損開始時(shí)（100 r/min）稍高，磨輪轉(zhuǎn)速到600 r/min時(shí)磨損量趨于穩(wěn)定，磨輪轉(zhuǎn)速到1600 r/min時(shí)磨損量仍然呈現(xiàn)較低水平。陶瓷層的沖蝕體積損失率也遠(yuǎn)低于2A06鋁合金基體

    Abstract:

    A dense ceramic oxide coating with approximate 40 μm thickness was prepared on 2A06 aluminum alloy by means of microarc oxidation in an alkali-silicate electrolytic solution. The morphology and the microstructure were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). Coating thickness and surface roughness (Ra) were measured after the coating was synthesized. The tribological performance of the coatings was evaluated using a dry sand abrasion test and a solid particle erosion test. The results show that microarc oxidation coatings consist of the loose superficial layer and the inner dense layer. Both the inner layer and the outer layer are composed of α-Al2O3 and γ-Al2O3, While the Al6Si2O3 phase is observed only in the outer loose layer, and the inner layer has a higher content of α-Al2O3 than that of the outer layer. The average of the microhardness of the ceramic coatings is 20.96 GPa. Moreover, under the same experimental condition, the specific wear rate of ceramic coating is smaller than that of 2A06 aluminum alloy which indicates the friction and the wear properties of the 2A06 aluminum alloy are improved and the lifetime of 2A06 aluminum alloy employed in harsh environments is extended with the increase of coating thickness and quality improvement

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李淑華,沈大為,祖媛媛,曲長(zhǎng)征,王富恥,馮順山.2A06鋁合金表面微弧氧化陶瓷層摩擦學(xué)特性[J].稀有金屬材料與工程,2014,43(1):154~157.[Li Shuhua, Shen Dawei, Zu Yuanyuan, Qu Changzheng, Wang Fuchi, Feng Shunshan. Tribological Performance of Ceramic Composite Coatings Obtained by Microarc Oxidation on 2A06 Aluminum Alloy[J]. Rare Metal Materials and Engineering,2014,43(1):154~157.]
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  • 收稿日期:2013-01-21
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  • 在線發(fā)布日期: 2014-04-16
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