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大多数金属对CO_2激光都有很高的反射率,故在激光热处理前,必须对零部件进行表面涂覆激光增吸收涂剂,以提高对CO_2激光的吸收能力。选取65Mn作为表面淬火基材,表面刷涂SiO_2、Al_2O_3混合型涂剂进行激光表面淬火。测量淬火前后水温变化、硬化区截面面积大小间接表征吸收率的大小,通过对表面硬化带的硬度、耐磨性测试,得到不同涂剂在表面淬火中的应用效果,并与市场购买涂剂进行对比。结果表明:试样激光淬火后引起的水温变化可结合截面硬化区面积一同表征涂剂对激光的吸收性,A、B两种SiO_2、Al_2O_3混合型涂剂的激光吸收性优于市购涂剂,且Al_2O_3含量高的B涂剂激光吸收性及淬火应用效果优于A涂剂,刷涂B涂剂的6#试样水温变化最大为22.8℃,截面硬化区面积最大为5.907mm~2,磨损率最低为20.9 mg,3~#试样硬化带平均硬度最大为64.5HRC。
Most metals have a high reflectivity for CO 2 laser, so before the laser heat treatment, the parts must be coated with laser absorbing agent to improve the absorption of CO 2 laser. Select 65Mn as the surface hardening substrate, surface brushing SiO_2, Al_2O_3 mixed type of laser surface hardening. The change of water temperature before and after quenching and the area of hardened area were measured to indirectly characterize the absorption rate. The hardness and wear resistance of the hardened zone were tested to obtain the application effects of different coating agents on surface hardening. Compared. The results show that the change of water temperature after laser quenching can be used to characterize the absorbency of the coating on the laser in combination with the area of the hardened area. The laser absorptivity of the two kinds of SiO_2 and Al_2O_3 hybrid coating is better than that of the commercially available coating , And the effect of laser absorption and quenching of B coating agent with high Al_2O_3 content is better than that of A coating agent. The maximum temperature change of water temperature of 6 # sample with B coating agent is 22.8 ℃, and the maximum cross-section hardened area is 5.907mm ~ 2, The lowest wear rate was 20.9 mg, and the average hardness of 3 ~ # specimens was 64.5 HRC.