CE/SEA-171改性SiC复合材料的制备及性能研究
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摘要
采用硅烷偶联剂SEA-171对碳化硅粉体(SiC)表面改性,制备了氰酸酯树脂/碳化硅复合材料。研究了SiC含量对复合材料的静态力学性能、电绝缘性能、导热性能和摩擦性能的影响,采用扫描电镜对材料的断面形貌进行了观察。结果表明:SiC质量分数为7%时,复合材料的耐磨性相对于纯氰酸酯树脂(CE)提高79.8%。SiC的质量分数为8%时,复合材料的冲击强度、弯曲强度分别比CE提高94.7%和75.0%,摩擦系数比纯CE降低了45.6%。SiC质量分数为10%时,复合材料的导热系数较CE提高4.7倍。少量SiC粉体的引入能有效改善氰酸酯复合材料的静态力学性能、耐磨性能,且复合材料仍保持良好的电绝缘性能。
The surface of the silicon carbide powder(SiC) was modified with a silane coupling agent SEA-171 to prepare a cyanate resin/silicon carbide composite. The effects of SiC content on the static mechanical properties,electrical insulation properties,thermal conductivity and friction properties of the composites were investigated. The cross-sectional morphology of the materials was observed by scanning electron microscopy. The results showed that the wear resistance of the composite was 79. 8 % higher than that of the pure cyanate resin(CE) when the SiC mass fraction was 7 %. When the mass fraction of SiC was 8 %,the impact strength and flexural strength of the composite were 94. 7 % and 75. 0 %higher than that of CE,respectively. The friction coefficient was decreased by 45. 6 % compared with pure CE. The thermal conductivity of the composite was 4. 7 times higher than CE when the SiC mass fraction was 10 %. The introduction of a small amount of SiC powder could effectively improve the static mechanical properties and wear resistance of the cyanate ester composite,and the composite still maintained good electrical insulation properties.
The surface of the silicon carbide powder(SiC) was modified with a silane coupling agent SEA-171 to prepare a cyanate resin/silicon carbide composite. The effects of SiC content on the static mechanical properties,electrical insulation properties,thermal conductivity and friction properties of the composites were investigated. The cross-sectional morphology of the materials was observed by scanning electron microscopy. The results showed that the wear resistance of the composite was 79. 8 % higher than that of the pure cyanate resin(CE) when the SiC mass fraction was 7 %. When the mass fraction of SiC was 8 %,the impact strength and flexural strength of the composite were 94. 7 % and 75. 0 %higher than that of CE,respectively. The friction coefficient was decreased by 45. 6 % compared with pure CE. The thermal conductivity of the composite was 4. 7 times higher than CE when the SiC mass fraction was 10 %. The introduction of a small amount of SiC powder could effectively improve the static mechanical properties and wear resistance of the cyanate ester composite,and the composite still maintained good electrical insulation properties.
引文
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[3]Gu J,Zhang Q,Dang J,et al.Thermal conductivity epoxy resin composites fill with boron nitride[J].Polymers for Advanced Technologies,2012,23(6):1025-1028.
[4]Hong J P,Yoon S W,Hwang T,et al.High thermal conductivity epoxy composirtes with bimodal distribution of aluminum nitride and boron nitride fillers[J].Thermochimica Acta,2012,537(11):70-75.
[5]Zhou W,Qi S,An Q,et al.Thermal conductivity of boron nitried reinforced polyethylene composites[J].Materials Research Bulletin,2007,42(10):1863-1873.
[6]Yuan F Y,Zhang H B,Li X,et al.Synergistic effect of boron nitrideflakes and tetrapod-shaped ZnO whiskers on the thermal conductivity of electrically insulating phenol formaldehyde composites[J].Composites Part A:Applied Science and Manufacturing,2013,53(19):137-144.
[7]Hamerton I,Takeda S.A study of the polymerrization of novelcyanate ester/acrylate blends[J].Polymer,2000,41(5):1647-1656.
[8]杨金水,李娟,魏凯耀.石英/双酚E型氰酸酯复合材料的制备与性能[J].国防科技大学学报,2016,38(1):26-33.
[9]周琪,钟永辉,陈星,等.石墨烯/纳米TiO2复合材料的制备及其光催化性能[J].复合材料学报,2014,34(2):255-262.
[10]K Dinakaran,M Alagar.Preparation and characterization of epoxycyanate ester interpenetrating network matrices/organoclay nanocomposites[J].Polymers for Advanced Technologies,2010,14(8):574-585.
[11]朱婷,胡德安,王毅刚.PMMA材料裂纹动态扩展及止裂研究[J].应用力学学报,2017,34(2):230-238.
[12]管公顺,王少恒,成方圆.不同加载应变率下有机玻璃的压缩破坏与力学行为[J].航空材料学报,2012,32(6):96-101.
[13]祝保林.钕掺杂二氧化钛/氰酸酯基复合材料的研究Ⅱ:固化动力学、静态、动态力学性能与耐热性能测试[J].热固性树脂,2015,30(1):5-12.
[14]Bowden F P,Talbot D.The friction and lubrication of solids[J].American Journal of Physics,1951,19(7):428.
[15]祝保林.钕掺杂二氧化钛/氰酸酯树脂基复合材料的研究Ⅲ:耐热、摩擦与介电性能测试[J].热固性树脂,2016,31(2):9-16.