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玻璃料可以改善可陶瓷化硅橡胶基复合材料高温热解后的力学强度,保持结构的完整性。为了研究玻璃料的成分对云母/硅橡胶复合材料耐高温性能的影响,分别以玻璃料A和B为助熔剂,制得了2种复合材料,研究了其力学性能、微观形貌、热分解性能及陶瓷化机制。结果表明:云母/硅橡胶复合材料常温拉伸强度为3~4 MPa,600~1 200℃下热解后试样的弯曲强度在0.3~4.5MPa之间,且保持结构完整;SEM结果显示玻璃料B有助于形成大量的液相结构,更好地改善热解后形成的陶瓷层的强度和结构;TG结果显示玻璃料可以加速硅橡胶的分解,因此要控制玻璃料的加入量;XRD结果显示在温度变化过程中,添加含SiO_2和K_2O成分较多的玻璃料B至云母/硅橡胶复合材料中形成了非晶相和钾长石(K_2O·Al_2O_3·6SiO_2),从而提高陶瓷层的强度。
Glass frit can improve the mechanical strength of ceramic silicon rubber-based composites after high temperature pyrolysis, and maintain the structural integrity. In order to study the influence of glass frit composition on the high temperature performance of mica / silicone rubber composites, two kinds of composites were prepared by using glass frit A and B as flux respectively. The mechanical properties, microstructure and thermal decomposition properties And ceramic mechanism. The results show that the tensile strength of mica / silicone rubber composites at room temperature is 3 ~ 4 MPa, the bending strength of samples after pyrolysis at 600 ~ 1 200 ℃ is between 0.3 ~ 4.5MPa, and the structure is intact. SEM results show that the glass Material B helps to form a large number of liquid phase structure, to better improve the strength and structure of the ceramic layer formed after pyrolysis; TG results show that the glass frit can accelerate the decomposition of the silicone rubber, so to control the glass frit addition; XRD The results show that amorphous glass and potassium feldspar (K 2 O · Al 2 O 3 .6SiO 2) are formed by adding glass frit B with more SiO 2 and K 2 O components to the mica / silicone rubber composites during the temperature change, strength.