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- 2015
SiBNCf/SiBNC陶瓷复合材料抗氧化性能
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Abstract:
以聚硼硅氮烷(PBSZ)为前驱体, SiBNC纤维(SiBNCf)为增强纤维, 采用前驱体聚合物裂解转化与热压烧结技术相结合的方法制备了SiBNCf /SiBNC陶瓷复合材料。在800~1 500 ℃空气气氛下非等温氧化1~3 h, 研究了SiBNCf/SiBNC的氧化演变机制及氧化动力学行为。采用SEM、 XRD研究了SiBNCf/SiBNC陶瓷复合材料氧化实验前后的微观形貌、 物相, 采用阿基米德体积排水法和三点弯曲测试法分析了复合材料的密度、 孔隙率及力学性能。结果表明: SiBNCf/SiBNC陶瓷复合材料具有优异的抗氧化性能和高温稳定性, 生成的氧化膜能有效阻隔氧气的进入, 并且有效填补了SiBNCf/SiBNC复合材料的裂纹及孔洞缺陷, 具有高温自愈合行为。SiBNCf/SiBNC复合材料氧化后密度提高, 这能大幅度提高其三点弯曲强度, 当密度从1.67 g/cm3提高到1.86 g/cm3时, 气孔率下降41%, 弯曲强度从7.51 MPa提高到26.54 MPa。 Using N-methylpolyborosilazane (PBSZ) as precursor, SiBNC fiber (SiBNCf) as reinforcement fiber, SiBNCf/SiBNC ceramic composites were fabricated by precursor polymer pyrolysis conversion and hot-press sintering method. The evolution of oxidation mechanism and kinetics of oxidation behavior of SiBNCf/SiBNC composites were investigated by non-isothermal oxidation tests under 800-1 500 ℃ for 1-3 h in air. The morphology and phase of SiBNCf/SiBNC ceramic composites before and after oxidation resistance were analyzed by means of SEM and XRD. The density, porosity and mechanical properties of composites were tested by Archimedes drainage volume method and three point bending test method. The results show that SiBNCf/SiBNC ceramic composites possess of outstanding oxidation resistance and high temperature stability. The prepared oxidation film can effectively block the entry of oxygen, and effectively fill the crack in SiBNCf/SiBNC composites and hole defect. The SiBNCf/SiBNC composites possess of high temperature self healing performance.The density of SiBNCf/SiBNC composites can be improved after oxidation, which can enhance the three point bending strength largely. As the density increase from 1.67 g/cm3 to 1.86 g/cm3, porosity decreases by 41%, bending strength inceases from 7.51 MPa to 26.54 MPa. 国家自然科学基金 (90916025); 上海市科委基础研究重点项目(14JC1400100); 中央高校基本科研业务费专项资金(14D110626)
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