许慎微,蒋礼,黄小忠,杜作娟,肖路军.聚氨酯表层涂覆制备掺铍碳化硅泡沫的研究[J].表面技术,2016,45(9):140-144.
XU Shen-wei,JIANG Li,HUANG Xiao-zhong,DU Zuo-juan,XIAO Lu-jun.Silicon Carbide Doped Beryllium Foam Ceramic Preparation by the Sur-face of Polyurethane Coating[J].Surface Technology,2016,45(9):140-144 |
| 聚氨酯表层涂覆制备掺铍碳化硅泡沫的研究 |
| Silicon Carbide Doped Beryllium Foam Ceramic Preparation by the Sur-face of Polyurethane Coating |
| 投稿时间：2016-01-22 修订日期：2016-09-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.09.022 |
| 中文关键词: 表层挂浆 碳化硅 含铍聚碳硅烷 泡沫陶瓷 结构性能 |
| 英文关键词:surface sizing SiC polycarbosilane containing beryllium foam ceramic structure property |
| 基金项目:国家高技术研究发展计划（863 计划）资助项目（ 2015AA7024034， 2014AA7024034， 2014AA7060403） |
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| Author | Institution |
| XU Shen-wei | a.School of Physics ＆ Electronics, Central South University, Changsha 410083, Chi-na |
| JIANG Li | a.School of Physics ＆ Electronics, Central South University, Changsha 410083, Chi-na |
| HUANG Xiao-zhong | b.School of Aeronautics ＆ Astronautics, Central South University, Changsha 410083, Chi-na |
| DU Zuo-juan | b.School of Aeronautics ＆ Astronautics, Central South University, Changsha 410083, Chi-na |
| XIAO Lu-jun | b.School of Aeronautics ＆ Astronautics, Central South University, Changsha 410083, Chi-na |
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| 中文摘要: |
| 目的 采用模板法通过先驱体涂覆裂解工艺获得性能优异的掺铍碳化硅泡沫陶瓷。方法 以掺铍聚碳硅烷（PBeCS)、二甲苯作为先驱体配制浆料，采用聚氨酯泡沫为模板，表层挂浆并烧结预制件后获得碳化硅泡沫陶瓷。运用XRD、SEM、波导法、保护热板法等手段，研究了浸渍液配比、烧结温度与Be元素对泡沫陶瓷结构、电磁性能、热导率的影响。结果 PBeCS经过陶瓷裂解后转变为无定型SiC，组成泡沫陶瓷的骨架。泡沫的开孔率为70%~90%，网孔的孔径介于0.5~1.2 mm之间。随着温度、浸渍浓度的增加，骨架的表面越平滑，致密化提高。Be元素的添加提高了陶瓷产率，先驱体中Be含量过低及泡沫陶瓷孔隙率高，导致了Be元素的低介电损耗、高热导率等性能没能在材料的整体复合性能中得到体现。结论 通过改变浸渍液配比、烧结温度可以获得所需结构性能的掺铍碳化硅泡沫陶瓷，Be元素对材料性能提升的证明还需进一步研究。 |
| 英文摘要: |
| Objective To prepare silicon carbide ceramic with excellent properties by precursor infiltration pyrolysis. Methods Using polycarbosilane containing beryllium and xylene as the precursor mixed slurry, SiC foam ceramic was prepared through processes of sizing and sintering with the polyurethane foam as a template. The influence of the impregnation concentration, sintering temperature and Be elements on the structure, electromagnetic properties and thermal conductivity was studied by XRD, SEM, waveguide method and guarded hot plate method. Results The amorphous SiC foam ceramic was formed after pyrolysis of PbeCS with a porosity and pore size of 70%~90% and 0.5~1.2 mm respectively. With the increase of temperature and concentration of impregnation liquid, the surface smoothness and densification of SiC would increase. The Be elements improved the ceramic production. However, the lower content of Be in preceramic polymer and high porosity resulted in that performances like low dielectric loss and high thermal conductivity were not reflected in the overall composite performance. Conclusion The SiC foam ceramic with required structure and property can be obtained by changing the impregnation liquid concentration and sintering temperature. The performance improvement by Be elements needs to be further studied. |
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