以硼酚醛树脂(BPF)为基体，以纳米 MgO、Al2 O3和 SiO2(MAS)为成瓷填料，添加 B2 O3、Bi2 O3或玻璃料等助熔剂，采用模压成型工艺制备 MgO-Al2 O3-SiO2/硼酚醛(MAS/BPF)陶瓷化复合材料，研究助熔剂对MAS/BPF陶瓷化复合材料热稳定性、微观结构和物相转变的影响。结果表明：MAS/BPF 陶瓷化复合材料在600~1000℃裂解2 h 后的尺寸收缩率为9%~14.5%，表现出良好的尺寸稳定性；TG 热分析发现，助熔剂使MAS/BPF陶瓷化复合材料在1200℃时的残留率降低，但在900~1200℃的热稳定性提高。XRD和 SEM分析结果显示，助熔剂能够显著降低陶瓷化反应温度。和 B2 O3、Bi2 O3相比，玻璃料更有助于形成大量的液相，促进陶瓷化组分与裂解残余碳之间的反应，从而提高 MAS/BPF陶瓷化复合材料在高温下的致密性和外形完整性。
MgO-Al2 O3-SiO2/boron phenolic (MAS/BPF)ceramifiable composites,based on ceramifiable fillers of nano MgO,Al2 O3 and SiO2 (MAS)modified matrix boron phenolic resin(BPF),were prepared with fusing agent of B2 O3 ,Bi2 O3 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 1 000 ℃ for 2 h,indicating a great dimensional stability.And TG analysis reveals that the fusing ageing reduces the char yields of MAS/BPF ceramifi-able 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 B2 O3 and Bi2 O3 , 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.
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