Ni-based Composite Coatings Reinforced by TiB2/WC Synthesized in Situ on Stainless Steel by Laser Cladding
摘 要
采用激光熔覆原位合成技术在不锈钢基体表面制备了TiB2/WC增强镍基复合涂层,用X射线衍射仪、能谱仪、扫描电镜等对涂层进行了分析,并对涂层进行了热震试验.结果表明:涂层致密、厚度均匀、表面平整、无裂纹和孔隙、与基体呈冶金结合;涂层主要由TiB2、WC、γ -Ni等物相组成,细小的TiB2和WC粒子主要分布于γ-Ni枝晶间,可阻碍基体晶粒晶界的推移长大;WC颗粒主要分布于涂层中部和下部区域,原位合成的细小TiB2粒子主要分布于涂层上部;涂层具有较高的抗裂能力,与基体具有良好的结合强度.
Abstract
The Ni-based composite coatings reinforced by TiB2 and WC were prepared on the stainless steel substrate by laser cladding.The coatings were analyzed by means of X-ray diffraction,X-ray energy dispersive spectroscope,scanning electron microscope and thermal shock experiment.The results indicate that the coatings were dense,smooth,uniform,free of cracks and pores,and had good adherence to the substrate.The coatings were composed of TiB2,WC and γ-Ni phases and the fine TiB2 and WC particles mainly dispersed at grain boundaries of γ-Ni dendrite and hindered the expansion of the grain boundaries.WC particles mainly dispersed at the middle and bottom zones after the laser cladding.TiB2 grains synthesized in situ were fine and mainly distributed at the upper zone.The coatings pocess a good metallurgical bond with the substrate and excellent cracking resistance.
中图分类号 TG156.99 TG115.5
所属栏目 新材料 新工艺
基金项目 上海市教委高校培养优秀青年教师科研专项基金资助项目(05XPYQ16);上海市教委自然科学基金资助项目(05NZ05)
收稿日期 2007/10/24
修改稿日期 2008/2/22
网络出版日期
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备注李军(1977-),男,内蒙古乌兰察布盟人,副教授,博士.
引用该论文: LI Jun,LI Wen-ge,ZHANG Hui-ying. Ni-based Composite Coatings Reinforced by TiB2/WC Synthesized in Situ on Stainless Steel by Laser Cladding[J]. Materials for mechancial engineering, 2008, 32(11): 34~38
李军,李文戈,张慧颖. 不锈钢基体上激光熔覆原位合成制备TiB2/WC增强镍基复合涂层[J]. 机械工程材料, 2008, 32(11): 34~38
被引情况:
【1】张瑄珺,李军,王慧萍,李曼萍, "添加Y2O3对激光熔覆原位合成TiB2和TiC增强镍基复合涂层组织的影响",机械工程材料 36, 17-20(2012)
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参考文献
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【3】Yang S,Zhong M L,Liu W J.TiC particulate composite coating produced in situ by laser cladding[J].Materials Science and Engineering A,2003,343:57-62.
【4】孙荣禄,杨贤金.激光熔覆原位合成TiC-TiB2/Ni基金属陶瓷涂层的组织和摩擦磨损性能[J].硅酸盐学报,2003,31(12):1221-1224.
【5】袁晓敏,龚佑品,何宜柱.TiB2对Ni基合金激光熔覆层组织与性能的影响[J].焊接学报,2007,28(5):41-44.
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【7】张维平,刘硕.激光熔覆原位生成TiB2热力学及动力学分析[J].材料科学与工程学报,2004,22(5):701-704.
【8】刘江龙.高能束热处理[M].北京:机械工业出版社,1997.
【9】王从曾.材料性能学[M].北京:北京工业大学出版社,2001.
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