利用激光熔覆技术在铝合金表面制备MoSi2/SiCp复合涂层,对涂层的微观组织形成规律及其主要工艺参数对涂层组织和性能的影响进行了研究.实验结果表明,对试样进行搭接预热和在熔覆粉末中添加助熔剂CaF2是提高熔覆层质量的主要途径.采用多道搭接预热熔覆工艺和预置涂层法可以在铝合金表面获得具有完全冶金结合的原位自生SiC颗粒增韧的硅化钼陶瓷复合涂层,涂层组织主要由Mo(Si,Al)2、SiC、α-Al、Mo5Si3等相组成.熔覆层显微硬度较基体材料的显微硬度有大幅度提高,涂层显微硬度最大可达850HV0.2.
参考文献
| [1] | Fu Y;Batchelor AW .Laser alloying of aluminum alloy AA 6061 with Ni and Cr.Part Ⅱ.The effect of laser alloying on the fretting wear resistance[J].Surface and Coatings Techonology,1998,102:119-126. |
| [2] | Zhou XB;De Hosson JThM .Reaction coating on aluminum alloys by laser processing[J].Ser Metall Mater,1993,28(02):219-224. |
| [3] | Katipelli LR.;Dahotre NB.;Agarwal A. .Laser surface engineered TiC coating on 6061 Al alloy: microstructure and wear[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2000(2/3):65-78. |
| [4] | Wu Weixin;Zeng Xiaoyan;Zhu Beidi et al.Cracking tendency of leser cladding Ni-based WC composite coatings[J].Chinese Journal of Lasers,1997,24(06):570-576. |
| [5] | 宋武林;朱蓓蒂;曾晓雁;崔昆 .镍含量对激光熔覆 Fe-Cr-Ni 涂层物理性能和裂纹敏感性的影响[J].热处理学报,1996,17(01):62-66. |
| [6] | Hidonci A;Pelletier JM .Microstructure and mechanical properties of MoSi2 coatings produced by laser processing[J].Materials Science and Engineering A,1998,252(01):17-26. |
| [7] | Chrysanthou A.;Whiting MJ.;Tsakiropoulos P.;Jenkins RC. .A STUDY OF THE COMBUSTION SYNTHESIS OF MOSI2 AND MOSI2-MATRIX COMPOSITES[J].Journal of Materials Science,1996(16):4221-4226. |
| [8] | A. MISRAt;A. A. SHARIF;J. J. PETROVIC .RAPID SOLUTION HARDENING AT ELEVATED TEMPERATURES BY SUBSTITUTIONAL Re ALLOYING IN MoSi_2[J].Acta materialia,2000(4):925-932. |
| [9] | J.A.Vreeling;V.Ocelik;Y.T.Pei .LASER MELT INJECTION IN ALUMINUM ALLOYS: ON THE ROLE OF THE OXIDE SKIN[J].Acta materialia,2000(17):4225-4233. |
| [10] | Makoto Nanko;Akihiko Kitahara;Takashi Ogura .Formation of Mo(Si, Al)_2 layer on Mo dipped in Al melt saturated with Si and the effects of transition metals added in the melt[J].Intermetallics,2001(7):637-646. |
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