摘要
为探索提高工程机械易损零部件服役寿命的新技术,采用等离子熔覆工艺,以Ni-Cr-C混合合金粉末为添加材料,在易损零部件用钢Q235表面形成了以初生块状金属陶瓷Cr7C3为硬质耐磨相,以强韧性良好的γ/Cr7C3共晶为基体的复合材料冶金涂层,分析了涂层的显微组织和硬度,在室温干滑动磨损条件下测试了其耐磨性。研究结果表明涂层组织致密,硬度较高,与基体之间为完全的冶金结合,在干滑动磨损条件下具有良好的耐磨性。
In order to explore the new techniques for improving the service life of the easily damaged components of machines effectively, a wear resistant γ/Cr_7C_3 composite coating was fabricated on substrate of commercial Q235 plain carbon steel by plasma cladding using Ni-Cr-C elemental powder blends. The microstructure, microhardness and wear resistance of the coating were investigated and the wear mechanisms were analysed. The results show that the plasma clad composite coating has a compact and rapidly solidified microstructure consisting of primary coarse blocky carbide Cr_7C_3 and the inter-blocky tough γ/Cr_7C_3 eutectic matrix and is metallurgically bonded to the steel substrate. The composite coating possesses high hardness and excellent wear resistance under dry sliding wear test conditions.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2006年第6期114-117,共4页
Transactions of Materials and Heat Treatment
基金
科技部国际合作重点项目(2005DFA70480)
河南省教育厅自然科学研究资助计划(2006430017)
关键词
等离子熔覆
涂层
组织
耐磨性
plasma jet cladding
coating
microstructure
wear resistance
