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合成了一种新型含锆先驱体,采用液相浸渍-炭化工艺循环制备含锆C/C复合材料,借助红外扫描、热失重分析、X射线衍射等检测手段对先驱体热处理过程中的结构变化进行分析;对复合材料进行恒温氧化失重率测定,并采用扫描电子显微镜观察氧化前后复合材料的微观形貌。结果表明:锆元素在复合材料中分布较为均匀,在1 000℃处理后形成C/C-ZrO2复合材料,这种复合材料的起始氧化温度可达631.1℃,较纯C/C复合材料的氧化温度提高了约300℃,且ZrO2含量增加能显著提升复合材料的抗氧化性能。
A novel zirconium-containing precursor was synthesized. The zirconium-containing C / C composites were prepared by liquid-phase impregnation-carbonization process. The structure of the precursors during the heat treatment was investigated by means of infrared scanning, thermogravimetric analysis and X-ray diffraction. The oxidation loss rate of the composites was measured. The microstructure of the composites before and after oxidation was observed by scanning electron microscopy. The results show that the zirconium element distributes uniformly in the composite, and the C / C-ZrO2 composite is formed after treatment at 1000 ℃. The initial oxidation temperature of the composite reaches 631.1 ℃, which is higher than pure C / C composite The oxidation temperature is increased by about 300 ℃, and the increase of ZrO2 content can significantly improve the oxidation resistance of the composites.