苏宇航,温祯洪,罗军明,崔世宇.预热温度对机匣等离子喷涂铝硅可磨耗封严涂层应力场影响的数值模拟[J].表面技术,2023,52(10):335-349.
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].Surface Technology,2023,52(10):335-349 |
| 预热温度对机匣等离子喷涂铝硅可磨耗封严涂层应力场影响的数值模拟 |
| Effect of Substrate Preheating Temperature on Residual Stress of Aluminum-Silicon Abrasion-Sealing Coatings by Plasma Spraying |
| 投稿时间：2022-10-20 修订日期：2023-02-18 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.029 |
| 中文关键词: 铝硅封严涂层 预热温度 应力场 数值模拟 |
| 英文关键词:aluminum silicon abrasion coating preheating temperature stress field numerical simulation |
| 基金项目:江西省自然科学基金项目(20202BABL204006);南昌航空大学基金(EA201801211) |
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| Author | Institution |
| SU Yu-hang | School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, china |
| WEN Zhen-hong | School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, china |
| LUO Jun-ming | School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, china |
| CUI Shi-yu | School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, china |
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| 中文摘要: |
| 目的 为确定机匣等离子喷涂铝硅涂层最佳预热温度，揭示不同预热温度对涂层残余应力的影响，优化基体预热温度，降低由于过大的残余应力导致涂层剥落和失效的可能性，为实际生产提供指导。方法 基于热弹塑性有限元理论，使用ANSYSWORKBENCH中稳态热和结构应力模块，建立双层等离子喷涂有限元模型。采用间接热力耦合方法对不同预热温度下的机匣等离子喷涂温度场和应力场进行模拟，分析不同预热温度对面层/黏结层/基体系统温度和应力分布的影响，重点研究了预热温度为30、50、80、120、150、180、200 ℃时涂层的温度场和应力场分布。结果 随着基体预热温度的升高，基体和涂层的温度梯度逐渐减小，面层等效应力逐渐减小，最大等效应力先减小后增大;y轴环向应力和z轴轴向应力分布及变化趋势基本相同;与y轴环向应力和z轴轴向应力相比，基体预热温度的变化对x轴径向拉应力、径向压应力的影响更大。结论 根据涂层的残余应力的分布和变化规律，等离子喷涂铝硅可磨耗封严涂层时，基体预热温度应控制在150 ℃。 |
| 英文摘要: |
| 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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