摘要
以二甲基硅油和苯基硅油为基体树脂,氧化铝、氮化硼、纳米碳酸钙、氧化锌和气相白炭黑等为填料,制备了一种超低热阻高导热硅脂,并对其导热性能、介电性能和可靠性进行了研究。研究结果表明:(1)使用改性偶联剂处理导热填料并添加稳定剂,能有效改善导热硅脂油粉分离的现象,使导热硅脂可以保持与界面的良好接触,从而保持良好的导热性能。(2)黏度研究表明,在冷热冲击和“双85”条件下,导热硅脂的黏度较起始黏度有所降低,黏度随老化时间的变化不明显,整体维持在较为稳定的水平。(3)热阻分析表明,导热硅脂的热阻在高温老化后能保持相对稳定。随着冷热冲击循环次数的增加,热阻逐渐增加;在“双85”条件下,导热硅脂的热阻随着老化时间先升高后降低,在老化250h后热阻达到最大值。(4)在相同老化时间下,随着温度的升高,导热硅脂的热导率变化趋势均呈现出先增加后降低的趋势。随着老化时间的延长,热导率呈现出明显的下降趋势,说明冷热冲击和“双85”对导热硅脂的热导率都有明显的影响。(5)制备的导热硅脂具有超低的热阻,经过环境老化后能保持膏状,最大热阻处于较低的水平,具有较好的导热性能,可满足电子电器产品要求。
A type of ultra-low thermal resistance and high thermal conductivity silicone grease was prepared by using dimethyl silicone oil and phenyl silicone oil as the matrix resins,and aluminum oxide,boron nitride,nano calcium carbonate,zinc oxide,and fumed silica as fillers.Its thermal conductivity,dielectric properties,and reliability were studied.The research results showed that,(1)The use of modified coupling agents to treat thermal conductive fillers and the addition of stabilizers could effectively improve the separation of oil and powder in the silicone grease,allowing the thermally conductive silicone grease to maintain good contact with the interface and thus maintain good thermal conductivity.(2)Viscosity studies showed that under cold and hot shock and“double 85”conditions,the viscosity of thermally conductive silicone grease decreased compared to the initial viscosity,and the change in viscosity with aging time was not significant,maintaining a relatively stable level overall.(3)Thermal resistance analysis showed that the thermal resistance of thermally conductive silicone grease could remain relatively stable after high-temperature aging.As the number of cold and hot shock cycles increased,the thermal resistance gradually increased.Under the“double 85”condition,the thermal resistance of thermally conductive silicone grease increased first and then decreased with aging time,reaching its maximum value after 250 hours of aging.(4)Under the same aging time,as the temperature increased,the thermal conductivity of thermally conductive silicone grease showed a trend of first increasing and then decreasing.With the extension of aging time,the thermal conductivity showed a significant downward trend,indicating that both thermal shock and“double 85”had a significant impact on the thermal conductivity of thermally conductive silicone grease.(5)The prepared thermally conductive silicone grease had ultra-low thermal resistance and could maintain a paste-like state after environmental aging.The maximum therma
作者
谭月敏
王政芳
李善吉
庞文键
欧阳文亮
Tan Yuemin;Wang Zhengfang;Li Shanji;Pang Wenjian;Ouyang Wenliang(Guangzhou Baiyun Technology Co.,Ltd.,Guangzhou 510540,Guangdong,China;School of Petroleum and Chemical Engineering,Guangzhou Institute of Technology,Guangzhou 510725,Guangdong,China)
出处
《中国胶粘剂》
CAS
2024年第12期63-67,共5页
China Adhesives
基金
广东省教育厅2023年度普通高校重点科研平台和项目--科研创新团队项目(2023KCXTD073)。
关键词
导热硅脂
超低热阻
热导率
可靠性
thermally conductive silicone grease
ultra-low thermal resistance
thermal conductivity
reliability
