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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 / nano-SiO2 composite coating was prepared on the surface of P20 plastic mold steel and strengthened by CO2 laser. The laser output power used is 2.0 ~ 3.1kW, the scanning speed is 0.8 ~ 2m / min. The microstructure of nanocomposite coatings and nanocomposite coatings was analyzed and their hardness and wear resistance were tested. The results show that the structure of the strengthened layer is polyhedral nano-SiO2 particles by laser treatment with high energy density, and the original defects of the plated layer (such as gaps and microcracks) are eliminated. The hardness and wear resistance of the strengthened layer are based on the nano-composite coating Further improve.