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《Acta Materiae Compositae Sinica》 2017-01
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Effects of fusing agent on the thermal behavior and microstructure of ceramifiable boron phenolic resin composites

FAN Shanshan;SHI Minxian;MENG Pan;CHEN Xia;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;  
MgO-Al_2O_3-SiO_2/boron phenolic(MAS/BPF)ceramifiable composites,based on ceramifiable fillers of nano MgO,Al_2O_3 and SiO_2(MAS)modified matrix boron phenolic resin(BPF),were prepared with fusing agent of B_2O_3,Bi_2O_3 or glass frits by hot compression molding.The effects of fusing agent on the thermal stability,microstructure and phase-transition of MAS/BPF ceramifiable composites were studied.The results show that the dimensional shrinkage rate varies from 9% to 14.5% after pyrolysed at 600-1000 ℃ for 2h,indicating agreat dimensional stability.And TG analysis reveals that the fusing ageing reduces the char yields of MAS/BPF ceramifiable composites at 1 200 ℃,but leading to a higher thermal stability at 900-1 200 ℃.XRD and SEM manifest ceramic reaction occurs at lower temperature with the addition of fusing agent.Compared with B_2O_3 and Bi_2O_3,glass frits contribute to forming a large amount of liquid phase structure,which promotes the reaction between the porous carbon from the decomposed resin matrix and ceramifiable fillers,improving the density and dimensional stability at high temperatures of MAS/BPF ceramifiable composites.
【Key Words】: ceramifiable carbon-based composite boron phenolic resin fusing agent thermal protection material residue
【Fund】: 湖北省企业委托项目(20131f0069)
【CateGory Index】: TQ323.1;TB332
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