摘要
在P20塑料模具钢表面制备了Ni／nano-SiO2复合镀层并利用CO2激光器进行强化处理。所采用的激光输出功率为2．0～3．1kW，扫描速度为0．8～2m／min。对纳米复合镀层、纳米复合镀激光强化层的显微组织结构进行分析，并测试了其硬度和耐磨性。结果表明：通过高能量密度的激光处理，强化层组织结构为多面体纳米SiO2颗粒，且消除了镀层原有缺陷（如间隙、微裂纹），强化层硬度、耐磨性在纳米复合镀层的基础上进一步提高。
Ni-SiO2 nanocomposite was prepared by pre-plated on P2O base metal and then hardened by laser remelting. The laser treatment is conducted with the power varying from 2.0kW to 3. 1kW, and the traversing speeds of the samples is 0.8 - 2m/min. The microstructure, microhardness and wear performance of the nano composite coating with and without laser hardening treatment were studied, respectively. The results show that polyhedral nano-SiO2 particles are formed, and the defects such as microcracks in the composite coating are eliminated after high power laser treatment. Comparing with the composite plating, the microhardness and wear property of the laser-strengthened composite coating are improved significantly.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第3期165-169,共5页
Transactions of Materials and Heat Treatment
基金
浙江省科技厅项目(2008C31G2020010)
浙江省教育厅科研项目(20070305)
关键词
纳米复合镀
激光强化
显微硬度
耐磨性
nano composite
laser hardened
micro-hardness
wear property
