玻璃料对MoSi2改性硼酚醛树脂可瓷化复合材料烧蚀性能的影响  

EFFECT OF GLASS FRITS ON THE ABLATIVE PERFORMANCE OF MoSi2 MODIFIED BORON PHENOLIC RESIN CERAMICABLE COMPOSITES

作　　者：杨威 黄志雄[1] 王雁冰[1] YANG Wei;HUANG Zhi-xiong;WANG Yan-bing(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《复合材料科学与工程》2020年第10期30-38,共9页Composites Science and Engineering

基　　金：中央高校基本科研业务费专项资金(WLT:2019Ⅲ043GX,WLT:2019Ⅲ066JL);校自主创新基金(WLT:202401001)。

摘　　要：将两种不同成分低熔点玻璃料G1和G2引入MoSi2改性硼酚醛树脂,采用预浸料-模压工艺制备了两种高硅氧纤维增强的复合材料,研究了玻璃料对MoSi2改性硼酚醛树脂裂解残留物相、热性能以及其高硅氧纤维增强复合材料的瓷化结构弯曲性能和烧蚀性能的影响。结果表明:玻璃料的引入使复合材料可瓷化温度降低了大约600℃,并且其中引入玻璃料G2的复合材料在800℃~1200℃的瓷化结构室温弯曲强度提高了6.5 MPa^7.6 MPa。另外玻璃料的引入使复合材料在氧乙炔烧蚀过程中,表面形成了致密熔体结构,抑制了热氧向里层碳化基体的扩散,其中SiO2成分含量较多的玻璃料G2有利于促进MoSi2颗粒与硼酚醛裂解产物相互作用形成高熔点陶瓷相Mo4.8Si3C0.6和MoB,使复合材料的质量烧蚀率降低了10.7%。Due to the high temperature required for ceramization of ceramicable composites,the ceramic layer formed in the early stage of ablation is not dense enough,which will affect the ablation performance of the composites.While the glass frits with low melting point can decline ceramization temperature of the composites.In this work,two low melting point glass frits G1 and G2 were introduced into the MoSi2 modified boron phenolic resin(BPR).Two vitreous silica fabric reinforced composites were prepared by prepreg-molding process.The effects of the glass frits on the thermal properties of the pyrolysis residues of MoSi2 modified BPR and the flexural properties of vitrified structure and ablative properties of its high-silica-fiber reinforced composites were studied.Test results show that the ceramifiable temperature of the composites declines by about 600℃,and room temperature bending strength of vitrified structure at 800℃~1200℃of the composites with glass frit G2 increases by 6.5 MPa^7.6 MPa.In addition,with the introduction of glass frit,a dense melt structure is formed on the surface of the composites in the process of oxyacetylene ablation,which inhibits the diffusion of hot oxygen to the inner carbonized matrix.Furthermore,glass frit G2 with more SiO2 content is beneficial to promote the interaction between MoSi2 particles and BPR pyrolysis products to form high-melting ceramic phases of Mo4.8Si3C0.6 and MoB,which reduce the mass ablation rate of the composites by 10.7%.

关 键 词：热防护 硼酚醛 MOSI2 玻璃料 陶瓷化机理 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]