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《Acta Materiae Compositae Sinica》 2017-01
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Preparation and properties of ceramifiable diatomite/silicone rubber composites

MENG Pan;WANG Yanbing;WEI Chong;FAN Shanshan;HUANG Zhixiong;Key Laboratory of Advanced Technology for Special Functional Materials of Ministry of Education,School of Materials Science and Engineering,Wuhan University of Technology;  
The poor heat resistance of silicone rubber seriously restricts its application in the field of high temperature resistance.To solve this problem,low melting oxide Sb_2O_3 and Bi_2O_3 were used as fluxing agent to study the effects on the ceramizable properties of diatomite/silicone rubber composites.The thermal stability of Sb_2O_3 and Bi_2O_3 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 dispersive 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 Sb_2O_3 and Bi_2O_3 can accelerate the decomposition of silicone rubber,but they can obviously improve the bending strength of the specimen after pyrolysis.Bi_2O_3 and Sb_2O_3 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 SiO_2 and Sb_2O_3,Bi_2O_3 and SiO_2 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.
【Key Words】: silicone rubber diatomite ceramizable fluxing agent ceramic mechanism
【Fund】: 国家自然科学基金(51003084)
【CateGory Index】: TQ333.93;TB332
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