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分别用PET短纤维和硅灰石 (无机针状晶须 )增强甲基乙烯基硅树脂 ,研究了纤维长度、含量与复合材料力学性能的关系 ,并考察了增强纤维对硅树脂热稳定性的影响。结果表明 :PET短纤维增强硅树脂复合材料的拉伸强度、模量和硬度显著提高 ,断裂伸长率下降 ;PET纤维长径比在 1 80～ 3 0 0范围内时 ,复合材料的拉伸强度最大 ;硅灰石增强的复合材料强度、模量及硬度提高相对较小 ,断裂伸长率随增强体用量增多 ,先增加而后降低 ,存在极大值 ;两类增强体均使复合材料的热稳定性提高。
The effects of fiber length and content on the mechanical properties of the composites were investigated by using PET staple fibers and wollastonite (inorganic acicular whiskers), respectively. The effects of the reinforcing fibers on the thermal stability of the silicone resin influences. The results showed that the tensile strength, modulus and hardness of PET short fiber reinforced silicone composites increased significantly and the elongation at break decreased. When the aspect ratio of PET fibers was in the range of 180 ~ 300, the elongation of composite The strength, modulus and hardness increase of wollastonite-reinforced composites are relatively small. The elongation at break increases with the amount of reinforcements, increases first and then decreases, and there exists a maximum value. Both types of reinforcements make the composites Thermal stability increased.