| 摘要: |
| 采用B4C,TiO2,石墨以及铁基粉末为激光熔覆材料,利用激光多道搭接熔覆技术在碳钢基体上制备TiB2-TiC颗粒增强铁基复合涂层.利用XRD,SEM对涂层的相结构和显微组织进行了研究.采用显微硬度计和滑动磨损试验机分别测试了涂层的硬度和耐磨性能.结果表明,激光熔覆过程B4C,TiO2和石墨反应生成了TiB2和TiC颗粒,并均匀分布在基体中.随着激光功率密度增加,涂层中TiC含量减少,甚至出现FeB脆性相.TiB2-TiC颗粒增强的涂层其硬度和耐磨性能优于基材45钢. |
| 关键词: TiB2-TiC颗粒 激光熔覆 显微组织 耐磨性能 |
| DOI： |
| 分类号: |
| 基金项目:山东省计划发展资助项目(2011GGX10327) |
|
| Laser cladding of in-situ TiB_2-TiC particles reinforced Fe-based coatings |
|
WANG Xinhong, ZOU Zengda, QU Shiyao
|
|
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
|
| Abstract: |
| In-situ TiB2-TiC particles reinforced Fe-based coatings were produced on carbon steel substrate by laser melting of mixture of B4C, TiO2, graphite and Fe-based self-melting alloy powders.The phase structure and microstructure was investigated with XRD and SEM.Meanwhile, the microhardness and wear properties of the coatings were tested with the micro-vickers and block-on-ring wear testing machine.The results showed that TiB2 and TiC ceramic particles were synthesized from the reaction of B4C+TiO2+C during laser cladding process, and the TiB2 and TiC particles were uniformly distributed in the coating.The amount of TiC decreased with the increase of laser power density.The microhardness and wear resistance of coatings were higher than those of 45 steel substrate. |
| Key words: TiB2-TiC particles laser cladding microstructure wear property |
