Effect of surface treatment by cathode spot of low pressure arc on bonding strength of spraying film by APPS
Effect of surface treatment by cathode spot of low pressure arc on bonding strength of spraying film by APPS
复制标题
低压电弧阴极点表面处理对APPS喷涂膜结合强度的影响
DOI：
10.1541/ieejpes.126.179
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
T. Inaba
中科院分区：
文献类型：
--
作者：
M. Saito;S. Tsukada;T. Inaba
低压电弧的阴极斑点可以去除金属表面的氧化层，蒸发金属表面的杂质。利用阴极斑点去除氧化层有望解决目前化学和机械清洗方法的问题。研究了常压等离子喷涂(APPS)前处理中的阴极斑现象。本文对氧化件和非氧化件的表面形貌分别采用单独的阴极斑、单独的喷砂和复合前处理方法：喷砂后的阴极斑进行处理。此外，将它们与传统的阴极斑点处理和机械喷砂表面进行了比较。结果表明，随着初始氧化层厚度的增加，工件表面粗糙度增大。揭示了利用低压弧阴极斑点进行表面处理后，影响表面结合强度的主要因素。由于初始氧化层厚度的影响，结合强度随表面粗糙度的算术平均高度而增加。当轮廓曲线单元的平均长度变窄时，粘结强度提高。喷砂后经阴极点处理后的粘接强度可达90 Mpa以上。主要结果如下。(1)初始氧化层厚度越大，表面粗糙度越大。表面高度在氧化层的最终去除时刻有最大值。因此，认为在这种情况下，喷涂表面的结合强度或结合强度达到最大。(2)揭示了利用低压弧阴极斑点进行表面处理后，影响表面结合强度的主要因素。(3)由于初始氧化层厚度的影响，结合强度随着表面粗糙度的算术平均高度的增加而增加。(4)当阴极斑点的表面算术平均高度相同时，轮廓曲线单元的平均长度变窄，粘接强度提高。(5)喷砂后阴极点处理后的粘结强度可达90 Mpa以上，是单纯喷砂或喷砂前处理的两倍多。图1.各前处理的算术平均高度的结合强度
The cathode spots of the low pressure arc can remove the oxide layer and evaporate impurities on the metal surface. The removal of the oxide layer by using the cathode spots is expected to solve the recent problems of the chemical and mechanical cleaning methods. The phenomena of the cathode spots for pre-treatment of Atmospheric Pressure Plasma Spray (APPS) have been investigated. In this paper, the surface shapes of oxide and non-oxide work pieces were treated by using a cathode spot only, a blast only and a composite pre-treating method: the cathode spots after grit blasting. In addition, they are compared with conventional cathode spots treated and mechanically blasted surfaces. As the results, the roughness on the surface of work pieces is arisen with the initial oxide layer thickness. It reveals the factors dominating bonding strength on the surface pre-treated by using the cathode spots of the low pressure arc. The bonding strength increases with the arithmetical mean height of the surface roughness due to the initial oxide layer thickness. The bonding strength is raised when the average length of outline curve element becomes narrow. The bonding adhesive strength treated by the cathode spots after the grit blasting is over 90 MPa. The main results are shown below. (1) The roughness on the surface of work pieces is arisen with the initial oxide layer thickness. The surface height has the maximum value at the final removal moment of oxide layer. Therefore, it is considered the bonding or adhesive strength of the sprayed surface becomes the maximum in such a condition. (2) It reveals the factors dominating bonding strength on the surface pre-treated by using the cathode spots of the low pressure arc. (3) The bonding strength increases with the arithmetical mean height of the surface roughness due to the initial oxide layer thickness. (4) When the arithmetical mean height of the surface pretreated by using the cathode spots is the same, the bonding strength is raised when the average length of outline curve element becomes narrow. (5) The bonding adhesive strength treated by the cathode spots after the grit blasting is over 90 MPa, over twice as times as previous treatment such as only the cathode spots or grit blasting. Fig. 1. Bonding strength for arithmetical mean height by each pre-treatment