摘要
对热喷涂WC-Co陶瓷涂层材料进行了宽带激光重熔试验,分析了熔覆层组织和物相组成,测试了熔覆层的硬度分布和摩擦磨损性能,分析了工艺参数对涂层物相,硬度的影响。结果表明,重熔后的熔覆层主要由WC、C、CW_3、Co_6W_6C、CCo_2W_4等构成。在重熔的过程中,WC有不同程度的分解,功率越大,WC分解越严重。适当控制激光功率至关重要。较大的扫描速度对提高熔覆层的硬度有一定的作用。热喷涂的WC-Co陶瓷涂层材料经宽带激光重熔能够得到结合良好的激光重熔层,基体与结合强度增强,孔隙率明显减少,涂层的致密程度和硬度提高,同时,耐磨性能也得到增强。磨损试验表明在干滑动摩擦下,WC-Co涂层的主要磨损机制为WC颗粒的磨粒磨损。
Wide-band CO2 laser cladding of thermal sprayed WC-Co ceramic coatings was performed, the microstructures and phase compositions of the cladding layers were analyzed, the hardness distribution and wear properties were measured, and the processing parameters on the phase and hardness of the coating were discussed. Laser re-melted coating consisted of WC, C, CW3, Co6W6C and CCo2W4. A higher laser power dissolved and decomposed WC, which was crucial to the performance of the coating. Meanwhile, a higher scanning speed contributed to the hardness of the coating that was metallurgical bonded to the matrix. The bonding strength, hardness and wear properties of the cladding layers were enhanced while porosity was reduced. Grain abrasion of WC was the main mechanism of the WC-Co coating found by wear tests.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期344-347,共4页
Rare Metal Materials and Engineering
基金
上海市科委光科技专项基金资助项目(05DZ22002)
