【摘要】 考察了微米Al2O3的填充量及其粒径对甲基乙烯基硅橡胶导热性能及力学性能的影响,与纳米Al2O3填充硅橡胶进行了对比。结果表明:硅橡胶的导热系数随微米Al2O3填充量的增加而升高,但微米Al2O3填充量过大时,硅橡胶的力学性能和加工性能变差,最大填充量不宜超过220份。当微米Al2O3填充量小于100份时,大粒径Al2O3填充硅橡胶的导热性能优于小粒径Al2O3填充硅橡胶;当微米Al2O3填充量超过100份后,5μmAl2O3填充硅橡胶的导热性能优于50μmAl2O3填充硅橡胶;0·5μmAl2O3填充硅橡胶的导热性能始终低于5μm和50μmAl2O3填充硅橡胶;纳米Al2O3填充硅橡胶的导热性能明显优于微米Al2O3填充硅橡胶。小粒径Al2O3填充硅橡胶的力学性能优于大粒径Al2O3填充硅橡胶。与单一微米粒径的Al2O3填充硅橡胶相比,在高填充量(180份)下,50,5,0·5μm与50nm的AlO(质量比2∶5∶1∶1)混合填充硅橡胶呈现较高的导热性能和拉伸强度。更多还原

【Abstract】 The effects of amount and particle sizes of micro-Al₂O₃ on the thermal conductivity and mechanical properties of filled methyl vinyl silicone rubber were analyzed and compared with nano-Al₂O₃ filled silicone rubber system. The results showed that thermal conductivity of silicone rubber increased with increasing micro-Al₂O₃ content.The mechanical and processing properties of filled silicone rubber became worse at too high portion of Al₂O₃.The preferable amount was below 220 phr. The thermal conductivity of large particles filled silicone rubber was higher than that of silicone rubber filled with small particles Al₂O₃ at less than 100 phr micro-Al₂O₃. While the micro-Al₂O₃ amount was above 100 phr, 5 μm Al₂O₃ filled silicone rubber exhibited higher thermal conductivity compared to 50 μm Al₂O₃ filled system, 0.5 μm Al₂O₃ filled silicone rubber always had lower thermal conductivity compared to the 5 μm and 50 μm Al₂O₃ filled systems. The nano-Al₂O₃ filled silicone rubber had higher thermal conductivity than those of three micro-Al₂O₃ filled systems. The silicone rubber filled with hybrid micro-Al₂O₃ and nano-Al₂O₃ at high loading （180 phr） with the preferable mass ratio of 2∶5∶1∶1 exhibited higher thermal conductivity and tensile strength, compared with the case where only micro-Al₂O₃ particles with single particles size were used.更多还原