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以硼酚醛树脂(BPF)为基体,以纳米MgO、Al_2O_3和SiO_2(MAS)为成瓷填料,添加B_2O_3、Bi_2O_3或玻璃料等助熔剂,采用模压成型工艺制备MgO-Al_2O_3-SiO_2/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2h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B_2O_3、Bi_2O_3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。
Using BPF as matrix, nano-MgO, Al 2 O 3 and SiO 2 (MAS) as filler, B_2O_3, Bi_2O_3 or glass frit and other fluxes were added to prepare MgO-Al 2 O 3 -SiO 2 / MAS / BPF) ceramic composites to study the influence of flux on the thermal stability, microstructure and phase transformation of MAS / BPF ceramic composites. The results show that the size shrinkage of MAS / BPF ceramic composite after being cracked at 600 ~ 1000 ℃ for 2h is 9% ~ 14.5%, showing good dimensional stability. TG thermal analysis shows that MAS / The residual rate of the composite at 1200 ° C decreases, but the thermal stability at 900-1200 ° C increases. XRD and SEM analysis showed that the flux can significantly reduce the ceramization reaction temperature. Compared with B_2O_3 and Bi_2O_3, the glass frit is more conducive to the formation of a large number of liquid phase, and promote the reaction between the ceramic components and pyrolysis residual carbon to improve the density and shape of MAS / BPF ceramic composites at high temperature Integrity.