特种阻尼硅橡胶长时热空气老化与贮存寿命
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摘要
研究了特种阻尼硅橡胶在不同温度长时老化的微观结构、力学性能和振动性能变化。通过低场核磁仪、红外光谱、拉伸性能测试、阻尼性能测试、压缩永久变形测试以及减振性能测试对阻尼材料老化行为进行了研究。研究结果表明,阻尼硅橡胶的老化过程同时存在交联反应和水解断链反应。老化前期以硅甲基的氧化为主,并形成硅氧硅交联键;老化后期水解反应的影响变得明显。随着老化时间的延长和老化温度的升高,其硬度增大,拉伸强度和拉断伸长率下降。阻尼材料的损耗因子及减振器的减振性能随老化时间的增长略有下降,阻尼因子下降率不超过14%。以材料的压缩永久变形作为材料贮存寿命的指标判据,评估了特种阻尼硅橡胶的贮存寿命为14.8年。
The macro-structure, mechanical properties and vibration performance of damping silicone rubber during long-term aging at different temperature were studied. The aging behavior was researched by low field nuclear magnetic resonance(LF-NMR), infrared spectroscopy(IR), mechanical testing, damping performance testing, compression set test and vibration performance test. It can be concluded that during aging, the cross-linking reaction and hydrolysis reaction exist at the same time. At the earlier stage, the silicon methyl is oxidized and Si-O-Si structure is formed. As the aging time increases and the aging temperature rises up, the hardness increases, while the tensile strength and elongation at break decrease. The damping factor of the materials and the vibration performance of the damper slightly decrease as the aging time increases, the rate of decline for damping factor is less than 14%. The lifetime was evaluated using compression set as index. The storage lifetime of the silicone rubber is evaluated to be 14.8 years.
The macro-structure, mechanical properties and vibration performance of damping silicone rubber during long-term aging at different temperature were studied. The aging behavior was researched by low field nuclear magnetic resonance(LF-NMR), infrared spectroscopy(IR), mechanical testing, damping performance testing, compression set test and vibration performance test. It can be concluded that during aging, the cross-linking reaction and hydrolysis reaction exist at the same time. At the earlier stage, the silicon methyl is oxidized and Si-O-Si structure is formed. As the aging time increases and the aging temperature rises up, the hardness increases, while the tensile strength and elongation at break decrease. The damping factor of the materials and the vibration performance of the damper slightly decrease as the aging time increases, the rate of decline for damping factor is less than 14%. The lifetime was evaluated using compression set as index. The storage lifetime of the silicone rubber is evaluated to be 14.8 years.
引文
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