磷酸铬铝高温透波材料的制备和性能研究

Study on Synthesis and Properties of Heat-resistant Electrically Transparent Chrome-alumina Phosphate

以氢氧化铝、氧化铬和磷酸为原料制备磷酸铬铝 ,通过对反应体系粘度的监测 ,控制反应程度、确定反应时间。采用DSC -TG和XRD分析研究体系固化特性和耐热性能。对层间剪切强度进行测试 ,初步评价磷酸铬铝复合材料的性能。结果表明 ,控制反应时间为 1h时可以得到转化率较高、粘度适当的体系。DSC -TG分析表明 ,该体系固化成型温度低于 2 0 0℃ ,成型工艺简单 ,同时结合XRD分析证明此材料体系具有优异的耐高温性能。对其复合材料层剪强度的研究发现 ,增强体材料表面进行涂层保护可有效地克服体系对增强体的腐蚀 ,有利于复合材料性能的改善。

The phosphate of chrome-alumina (PCA) was synthesized with aluminium hydroxide, chromic oxide and phosphoric acid as original materials. The viscosity of the reaction system was monitored to control extent of the reaction. The DSC-TG and XRD techniques were used to analyze the PCA properties. The ILSS of its composites was measured. Experimental results indicated that the proper matrix could be produced when reaction time was 1 h. DSC-TG results revealed that the PCA could be cured under 200℃,making the processing easily. Meanwhile,analysis of DSC-TG and XRD all proved that the PCA had well heat-resistant properties. The ILSS results showed that protective coating was useful to improve ILSS of the composites by preventing reinforcement surface from corrosion of the PCA.