激光熔覆Mo2NiB2熔覆层的制备及其性能表征

被引:5
|
作者
倪晓杰 [1 ]
刘福康 [2 ]
胡肇炜 [2 ]
赵忠贤 [2 ]
王生泽 [1 ]
赵远涛 [2 ]
李文戈 [2 ]
机构
[1] 东华大学机械学院
[2] 上海海事大学商船学院
关键词
激光熔覆; Mo2NiB2金属陶瓷; 激光工艺; 组织结构; 性能;
D O I
暂无
中图分类号
TG174.4 [金属表面防护技术]; TG665 [光能加工设备及其加工];
学科分类号
摘要
Mo2NiB2三元硼化物具有高硬度与良好耐腐蚀等性能,可应用于Q235钢的表面防护。以Mo、Ni与B粉末为原料,采用激光熔覆技术在Q235基材表面原位合成Mo2NiB2基金属陶瓷熔覆层,研究了激光熔覆次数对熔覆层组织结构与性能的影响。研究发现,Mo2NiB2熔覆层由Mo2NiB2陶瓷硬质相与FeNi合金黏结相构成,随着激光熔覆次数的增加,Mo2NiB2陶瓷相含量先增后减。Mo2NiB2陶瓷相趋于熔覆层中间部位聚集,且熔覆层与Q235基材间形成成分梯度变化的冶金结合区。随着激光熔覆次数的增加,Mo2NiB2熔覆层的硬度与耐腐蚀性能均先提高后降低,在3次激光熔覆时两者为最优,其硬度高于Q235基材1个数量级,而自腐蚀电流密度低于Q235基材2个数量级。Mo2NiB2熔覆层性能主要取决于熔覆层的组织结构与陶瓷相的相对含量。
引用
收藏
页码:122 / 130
页数:9
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