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鋁合金表面激光熔覆原位自生TiC增強(qiáng)金屬基復(fù)合材料涂層
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TB333

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中國(guó)科學(xué)院院長(zhǎng)特別基金資助


An In-situ Formed TiC Particle Reinforcement Composite Coating Induced by Laser Cladding on Aluminium Alloy
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    摘要:

    以Ti,SiC混合粉末作為預(yù)置合金涂層，采用2kW連續(xù)Nd:YAG固體激光器進(jìn)行激光熔覆處理，在6061鋁合金表面借助于接觸反應(yīng)法制備原位生成TiC顆粒增強(qiáng)Al-Ti復(fù)合材料涂層。試驗(yàn)結(jié)果表明：采用適合的激光輻照工藝參數(shù)，可獲得增強(qiáng)相TiC彌散分布，以Ti-Al金屬間化合物及Al過(guò)飽和固溶體為主要組成相的復(fù)合材料熔覆層組織。TiC顆粒與復(fù)合材料基體潤(rùn)濕良好，熔覆層結(jié)晶致密，與6061鋁合金基材呈良好的冶金,珂明顯地改善鋁合金的表面性能。

    Abstract:

    Metal matrix composite (MMC) surface layer have been formed on 6061 aluminium alloy surface by laser cladding of using a 2kW continuous wave (CW) Nd YAG laser. The TiC particle reinforced Al Ti composite coating was prepared by in situ contact reaction with preplaced powder mixtures of Ti and SiC. The formation mechanism of TiC particles has been studied. It was found that composite coating consisting of TiC particles dispersed in coating matrix could be obtained using the correct ratio of Ti to SiC powders and a laser power density. Compound material cladding coating mainly consists of Ti Al intermetallic compound and Al supersaturated solid solution. The coating was characterized by good metallurgical bonding between the coating and the substrate, good wettability between the reinforcement TiC and the coating matrix,and a fine grain structure. The results show that the composite coating greatly enhances the surface hardness.

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張松 康煜平 等.鋁合金表面激光熔覆原位自生TiC增強(qiáng)金屬基復(fù)合材料涂層[J].稀有金屬材料與工程,2001,(6):422~427.[Zhang Song, Kang Yuping, H. C. Man, Wu Weitao, Wang Maocai . An In-situ Formed TiC Particle Reinforcement Composite Coating Induced by Laser Cladding on Aluminium Alloy[J]. Rare Metal Materials and Engineering,2001,(6):422~427.]
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  • 最后修改日期:2001-01-04
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