SiCp/A356制动盘材料性能衰退机制及温度容限研究

doi:10.3901/JME.2025.18.107

摘要/Abstract

摘要： SiCp/A356复合材料制动盘服役过程中存在力学性能衰退现象。为了揭示SiCp/A356制动盘材料的力学性能衰退规律与机制，确定SiCp/A356复合材料的使用温度容限，本研究依据SiCp/A356制动盘服役温度条件，开展SiCp/A356复合材料的热循环试验研究，并结合性能测试、宏微观分析和代表性体积单元(RVE)微观仿真等手段进行分析。试验与仿真结果表明：循环温度小于200 ℃时，复合材料仅出现轻微的基体机械损伤和结合界面损伤，性能基本维持稳定；循环温度在[200 ℃，250 ℃]时，复合材料性能在一定热循环次数内维持稳定，然后出现一定幅度下降，随之性能会再次趋于稳定；循环温度大于250 ℃时，复合材料快速出现严重的基体机械损伤和结合界面损伤，材料性能快速衰退。因此，SiCp/A356复合材料长期使用温度区间应控制在200 ℃以下。考虑复合材料损伤的温变机制，可以采用增加基体中的Cu元素含量以提高基体的热强性、改善SiC颗粒与基体的浸润性(提高氧化温度、延长氧化时间)以提高界面性能等手段，提高SiCp/A356复合材料的使用温度容限。

关键词: SiCp/A356复合材料, 性能衰退, RVE仿真, 温度容限

Abstract: The mechanical properties of SiCp/A356 composite brake disc generally declines during the process of service. To reveal the decay rule and damage mechanism of mechanical properties of SiCp/A356 brake disc material and clarify the service temperature limit of SiCp/A356 composite material, the thermal cycle tests of SiCp/A356 composite materials were carried out according to the service temperature conditions of SiCp/A356 brake disc, and combined with the performance test, macro and micro analysis and micro simulation for a representative volume element (RVE), the analysis was carried out. The experimental and simulation results show that when the cyclic temperature is less than 200 ℃, the matrix mechanical damage and bonding interface damage of the composites are slight, and the performance remains basically stable; When the cycle temperature is at [200 ℃, 250 ℃], the properties of the composites remain stable within a certain number of thermal cycles, and then decrease to a certain extent, and then the properties become stable again. When the cyclic temperature is greater than 250 ℃, the matrix mechanical damage and bonding interface damage of the composites rapidly occur, and the material properties rapidly decline. Therefore, the long-term service temperature range of the SiCp/A356 composites should be controlled below 200 ℃. Considering the temperature change damage mechanism of the composites, the temperature limit of the SiCp/A356 composites can be increased by increasing the Cu content in the matrix to improve the thermal strength of the matrix, improving the wettability between SiC particles and the matrix (by increasing the oxidation temperature and extending the oxidation time) to improve the interface performance.

Key words: SiCp/A356 composite material, performance degradation, RVE simulation, service temperature limit

中图分类号:

TB333

杨智勇, 李培震, 臧家俊, 宋丕麟, 李志强. SiCp/A356制动盘材料性能衰退机制及温度容限研究[J]. 机械工程学报, 2025, 61(18): 107-117.

YANG Zhiyong, LI Peizhen, ZANG Jiajun, SONG Pilin, LI Zhiqiang. Study on the Performance Degradation Mechanism and Service Temperature Limit of SiCp/A356 Brake Disc Material[J]. Journal of Mechanical Engineering, 2025, 61(18): 107-117.

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