高性能镍基复合镀层的制备与研究
发布时间：2019-04-27 01:38
【摘要】：大量的零件和设备由于磨损而失效,造成了极大的损失。多种表面技术已经成功应用到解决表面磨损的问题。而高接触应力下工件表面的磨损问题解决方案较少,如轧辊表面的修复与强化。因此解决此问题具有重要的经济价值。通过电刷镀和电接触强化技术制备了高性能的冶金结合镀层,得到了缺陷较少的Ni-P合金镀层和Ni-P/Cr_3C_2复合镀层。Ni-P合金镀层硬度为780.79HV0.1,热震时裂纹开始出现次数为80,镀层开始出现剥落次数为105;Ni-P/Cr_3C_2复合镀层硬度为850.90HV0.1,热震时裂纹开始出现次数为83,镀层开始出现剥落次数为128。对Ni-P合金镀层工艺优化和Ni-P/Cr_3C_2复合镀层预镀层制备技术进行研究,得到的Ni-P合金预镀层的硬度达到582.46HV0.1,Ni-P/Cr_3C_2复合预镀层硬度达到662.97 HV0.1,镀层厚度为150um,且与基体分界明显,但镀层上存在一些孔洞和裂纹,有待于进一步提高。对Ni-P镀层进行工艺优化,当温度是35℃,电压是12V时,Ni-P镀层的硬度和厚度相对较好,电刷镀后的Ni-P镀层的硬度达到582.46HV0.1;通过行星球磨机制备Cr_3C_2颗粒,综合机械分散,超声波分散和活性剂分散的方法,制备出分散性能良好的Ni-P/Cr_3C_2镀液。并且探索出在20g/l时,镀层的硬度达到最大值662.97HV0.1;同时电刷镀的工艺具有稳定性和重复性,Ni-P和Ni-P/Cr_3C_2预镀层与基体分界明显,但镀层上存在一些孔洞和裂纹,且基体和镀层属于机械结合,因此有待于进一步提高。利用电接触技术强化预镀层,对电接触强化后的Ni-P合金镀层和Ni-P/Cr_3C_2复合镀层进行进一步的研究。经过电接触强化后,Ni-P镀层和Ni-P/Cr_3C_2镀层上的缺陷减少,镀层和基体界面发生熔合,硬度分别提高到780.79HV0.1和850.90HV0.1;通过元素线扫描分析可知,电接触强化使镀层与基体的结合方式发生变化,从机械结合变成冶金结合;通过XRD进一步分析可知,电接触强化使镀层析出了新相Ni3P,而且细化了晶粒,可能导致了硬度的提高;通过热震性分析可知,经过电接触强化后,热震性提高。
[Abstract]:A large number of parts and equipment have failed due to wear and tear, resulting in a great loss. A variety of surface techniques have been successfully applied to solve the problem of surface wear. However, there are few solutions to the wear of workpiece surface under high contact stress, such as the restoration and strengthening of roll surface. Therefore, solving this problem has important economic value. Ni-P alloy coating and Ni-P/Cr_3C_2 composite coating with fewer defects were prepared by brush plating and electrical contact strengthening. The hardness of Ni-P alloy coating was 780.79HV0.1, and the hardness of Ni-P alloy coating was 780.79HV0.1, and the hardness of Ni-P alloy coating was 780.79HV0.1, During thermal shock, the number of cracks appearing at first is 80, and the number of spalling of coating begins to appear is 105; The hardness of Ni-P/Cr_3C_2 composite coating is 850.90 HV0.1, the number of cracks appearing in thermal shock is 83, and the number of spalling in coating is 128. The technological optimization of Ni-P alloy coating and the preparation technology of Ni-P/Cr_3C_2 composite coating were studied. The hardness of Ni-P alloy preplating layer reached 582.46HV0.1, The hardness of Ni-P/Cr_3C_2 composite precoating is up to 662.97 HV0.1, the thickness of the coating is 150um, and the boundary between the coating and substrate is obvious, but there are some holes and cracks on the coating, which need to be further improved. The process of Ni-P coating is optimized. When the temperature is 35 鈩，
本文编号：2466578
[Abstract]:A large number of parts and equipment have failed due to wear and tear, resulting in a great loss. A variety of surface techniques have been successfully applied to solve the problem of surface wear. However, there are few solutions to the wear of workpiece surface under high contact stress, such as the restoration and strengthening of roll surface. Therefore, solving this problem has important economic value. Ni-P alloy coating and Ni-P/Cr_3C_2 composite coating with fewer defects were prepared by brush plating and electrical contact strengthening. The hardness of Ni-P alloy coating was 780.79HV0.1, and the hardness of Ni-P alloy coating was 780.79HV0.1, and the hardness of Ni-P alloy coating was 780.79HV0.1, During thermal shock, the number of cracks appearing at first is 80, and the number of spalling of coating begins to appear is 105; The hardness of Ni-P/Cr_3C_2 composite coating is 850.90 HV0.1, the number of cracks appearing in thermal shock is 83, and the number of spalling in coating is 128. The technological optimization of Ni-P alloy coating and the preparation technology of Ni-P/Cr_3C_2 composite coating were studied. The hardness of Ni-P alloy preplating layer reached 582.46HV0.1, The hardness of Ni-P/Cr_3C_2 composite precoating is up to 662.97 HV0.1, the thickness of the coating is 150um, and the boundary between the coating and substrate is obvious, but there are some holes and cracks on the coating, which need to be further improved. The process of Ni-P coating is optimized. When the temperature is 35 鈩，
本文编号：2466578
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