硅橡胶耐热性不佳严重制约着其在耐高温领域的应用。针对这一问题,分别采用低熔点氧化物 Sb2 O3和Bi2 O3作为助溶剂,研究其对硅藻土/硅橡胶复合材料可瓷化性能的影响。采用 TG分析 Sb2 O3和 Bi2 O3对硅藻土/硅橡胶复合材料的热稳定性影响,万能力学试验仪测试热解后试样的弯曲强度,场发射扫描电镜(FESEM)和能谱仪(EDS)分析热解产物的微观形貌和成份,XRD 探索复合材料的可瓷化机制。结果表明：Sb2 O3和 Bi2 O3金属氧化物会加速硅橡胶的分解,但可以明显提高热解后试样的弯曲强度。FESEM观测到 Sb2 O3和 Bi2 O3有助于复合材料在热解过程中形成连续的桥连结构,通过EDS分析计算可知,Sb2 O3与SiO2,Bi2 O3与SiO2在热解过程中可能发生共熔反应,有助于陶瓷化结构的形成。XRD表明,加入助溶剂后的硅藻土/硅橡胶复合材料的热解后形成非晶相结构,提高陶瓷层的强度。
The poor heat resistance of silicone rubber seriously restricts its application in the field of high tempera-ture resistance.To solve this problem,low melting oxide Sb2 O3 and Bi2 O3 were used as fluxing agent to study the effects on the ceramizable properties of diatomite/silicone rubber composites.The thermal stability of Sb2 O3 and Bi2 O3 on diatomite/silicone rubber composites was analyzed by TG,the bending strength after pyrolysis was tested by universal mechanical testing apparatus,field emission scanning electron microscope (FESEM)and energy disper-sive spectrometer (EDS)were used to analyze the microstructure and composition of the pyrolysis products,and ceramic mechanism was studied by XRD.The results show that metal oxide of Sb2 O3 and Bi2 O3 can accelerate the decomposition of silicone rubber,but they can obviously improve the bending strength of the specimen after pyroly-sis.Bi2 O3 and Sb2 O3 are contribute to the formation of a continuous bridge structure in the process of composites pyrolysis by FESEM.Through EDS analysis,eutectic phenomenon may be occurring between SiO2 and Sb2 O3 , Bi2 O3 and SiO2 in the process of composites pyrolysis and help to form a ceramic structure.XRD show that the amorphous phase structure is formed after the addition of fluxing agent to diatomite/silicone rubber composite, which can improve the strength of the ceramics.
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