| SU Yu-hang,WEN Zhen-hong,LUO Jun-ming,CUI Shi-yu.Effect of Substrate Preheating Temperature on Residual Stress of Aluminum-Silicon Abrasion-Sealing Coatings by Plasma Spraying[J],52(10):335-349 |
| Effect of Substrate Preheating Temperature on Residual Stress of Aluminum-Silicon Abrasion-Sealing Coatings by Plasma Spraying |
| Received:October 20, 2022 Revised:February 18, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.029 |
| KeyWord:aluminum silicon abrasion coating preheating temperature stress field numerical simulation |
| Author | Institution |
| SU Yu-hang |
School of Material Science and Engineering, Nanchang Hangkong University, Nanchang , china |
| WEN Zhen-hong |
School of Material Science and Engineering, Nanchang Hangkong University, Nanchang , china |
| LUO Jun-ming |
School of Material Science and Engineering, Nanchang Hangkong University, Nanchang , china |
| CUI Shi-yu |
School of Material Science and Engineering, Nanchang Hangkong University, Nanchang , china |
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| Abstract: |
| As a wearable sealing coating, the Al-Si alloy coating has the advantages of low surface roughness, no chipping during coating operation, and the more polished the coating is, the smoother it will become. However, there are few reports on the finite element analysis of the Al-Si alloy sealing coating. Al-Si sealing coatings of the cartridge receiver are sprayed by plasma spraying as the spraying technology. During the coating spraying process, there will be sudden heating and cooling, so it is easy to generate residual stress on the machined workpiece and coating during spraying. The coating residual stress is one of the main reasons for the cracking and peeling of the Al-Si coating, so it is very important to reduce the coating residual stress. Before plasma spraying, the substrate needs to be preheated. Optimize the preheating temperature of the substrate, which can reduce the cooling rate of the droplets, improve the uniformity of the temperature distribution of the coating system, reduce the thermal stress of the coating, and thus reduce the residual stress of the coating. Therefore, it is necessary to determine an optimal preheating temperature of the substrate to improve the effect of residual stress on the coating stability. Based on the thermal elastic plastic finite element theory and ANSYSWORKBENCH finite element analysis software, this paper establishes a double-layer coating model, uses the indirect thermal mechanical coupling method to study the effect of different substrate preheating temperatures on the residual stress and distribution of Al-Si coating, and analyzes the value and distribution of the equivalent stress, x-axis radial stress, y-axis circumferential stress, and z-axis axial stress of the surface layer/bonding layer/substrate system. The purpose is to find the best preheating temperature of the substrate for spraying Al-Si coating. It can be found that when the preheating temperature is lower than 150 ℃, the maximum equivalent stress decreases with the increasing preheating temperature, and the stress concentration is located on the surface of the surface layer; When the preheating temperature is higher than 150 ℃, the stress value increases, and the stress concentration part is transferred to the bonding edge of bonding layer and the surface layer. Compared with other preheating temperatures, when the substrate preheating temperature is 150 ℃, the radial stress mutation in the coating thickness direction is minimum. When the preheating temperature is 150 ℃ to 180 ℃, the y-axis circumferential stress achieves low horizontal tensile stress and compressive stress. The compressive stress on the surface of the surface layer is easy to cause bending deformation of the coating. The maximum compressive stress concentrate at the bonding edge of the bonding layer and the surface layer is easy to cause gaps between the coatings and lead to coating separation. For the y-axis circumferential stress, the coating failure probability is minimum when the preheating temperature is 150 ℃ to 180 ℃. With the increase of preheating temperature, the distribution and change trend of shaft circumferential stress and z-axis axial stress are basically the same. Compared with y-axis circumferential stress and z-axis axial stress, the change of substrate preheating temperature has greater effect on x-axis radial tensile stress and radial compressive stress. It can be concluded that the preheating temperature of the substrate should be controlled at 150 ℃ when plasma spraying Al-Si wearable sealing coating. |
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