Influence of glass frit on high temperature properties and dielectric properties of Si3N4 modified boron phenolic resin composites

被引：0

作者：

Han P. ^{[1
]}

Deng Z. ^{[1
]}

Li P. ^{[1
]}

Yang T. ^{[1
]}

Wan L. ^{[1
]}

Dong C. ^{[1
]}

Shi M. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Wuhan University of Technology, Wuhan

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 05期

关键词：

ablation resistance; ceramizable composite; dielectric properties; high temperature resistance; microstructure; Si[!sub]3[!/sub]N[!sub]4[!/sub;

D O I：

10.13801/j.cnki.fhclxb.20220809.004

中图分类号：

学科分类号：

摘要：

To investigate effect of flux on properties and microstructure of resin matrix composites at elevated temperature, glass frit (GF) and Si3N4 modified high silica glass fiber reinforced boron phenolic resin composites (GF-Si3N4/BPR) were prepared via a compression molding technique using low melting point GF as flux and Si3N4 particles as high temperature resistant fillers. The influence of GF on the high temperature properties and dielectric properties of composites was studied. The results show that the introduced GF promotes the formation of liquid phase on the surface of composites and the densification of the ceramic layer, inhibiting erosion of composites by oxygen at elevated temperatures and significantly improving the high temperature performance of composites. The flexural strength of GF-Si3N4/BPR treated at 1 200℃ was increased by 81.3% and 14.9%, respectively, compared with high silica glass fiber reinforced boron phenolic resin composites (BPR) and Si3N4 modified high silica glass fiber reinforced boron phenolic resin composites (Si3N4/BPR), while the mass ablation rate was reduced by 73.1% and 55.1%, respectively, compared with BPR and Si3N4/BPR. Furthermore, at 8.2 GHz, the dielectric constant (ε) and loss tangent (tanδ) of the composites gradually increased with increasing temperature. At temperatures above 800°C, the resulting glass phase effectively restrains the adverse effects of free carbon, pores, and cracks generated by resin cracking on the dielectric properties of the material. The prepared composite material has excellent high temperature properties and dielectric properties, and is expected to be applied in the field of high temperature wave transmission. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

页码：3037 / 3046

页数：9

共 26 条

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