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文摘
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鉴于铝合金的广泛应用价值及其因质软而在应用方面受到的限制,应用激光材料表面复合化方法对铝合金材料表面进行强化处理,具体为利用Nd:YAG脉冲激光采用纳米级和微米级SiC粉对铝合金表面进行复合化处理.通过对实验结果观察和分析表明,纳米级SiC粉形成激光铝合金表面复合化涂层比微米级SiC粉所形成复合化涂层组织均匀、致密、缺陷少、涂层与基材间结合状态好并显著提高了铝合金表面的显微硬度.分析原因在于微米级SiC粉在激光熔池内发生沉降,而纳米级SiC粉可在激光熔池内形成较均匀分布,这是重力作用受粉颗粒大小影响显著的结果.从而可以看出,SiC颗粒形状、大小及其在涂层中的分布状态直接影响涂层组织特征、涂层与基材间的结合状态;把形状规则、颗粒细小、在涂层中能够形成均匀分布的SiC粉作为涂层复合物有利于形成组织特征均匀、缺陷少、与基材结合状态好的复合涂层. |
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其他语种文摘
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Aluminium alloy is used widely in our society, but it is not good enough for many applications because it is soft. In order to harden the surface of the aluminium alloy, the surface is compounded by laser in this experiment. Here, two kinds of SiC power , the diameters of which are nanometer-grade and micron-grade respectively , are compounded to the surface with Nd:YAG pulsed laser separately. The experiment results show that: the coating compounded with the nanometer-grade diameter powder has more homogeneous and more compact microstructure, less defects and better bonding with the base material than that with the micron-grade diameter powder. The mechanism for the results is that: the gravitation rule is affected markedly by the size of the power. In the laser melting pool, the micron-grade diameter powder sinks, while the nanometer-grade diameter powder can distribute homogeneously. A conclusion can be drawn: the microstructure of the coating and the bonding between the coating and the base material are affected directly by the shape, the size and the distribution of the SiC power in the laser melting pool. In the coating, more regular, smaller and distributed more homogeneously the SiC power is, more homogeneous microstructure, less defect and better bonding with the base material the composite coating will be. |
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来源
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中国激光
,2004,31(6):765-768 【核心库】
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关键词
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激光技术
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铝合金
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复合化处理
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SiC粉
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地址
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1.
中国科学院金属研究所, 金属腐蚀与防护国家重点实验室, 辽宁, 沈阳, 110016
2.
中国科学院沈阳自动化研究所, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0258-7025 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:1590610
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