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摘要: 以氯化锌、磷酸、磷酸盐等为原料研制一种新型改性磷酸盐涂料，利用扫描电镜观察涂层C/C复合材料试样氧化前后微观结构形貌的变化，并对比研究改性前后磷酸盐涂料及以硅、硼为主的多组分陶瓷涂料涂层试样的静态防氧化性能、热震性能。结果表明：在500℃氧化100h，这三种涂层均具有良好的氧化防护性能，涂层试样最大失重率仅为1.25％；在700℃氧化30h，以及经过“900℃、3min室温、2min 30次”→“1100℃、3min室温、2min 10次”的连续热震实验，改性磷酸盐涂层试样的氧化失重率均最小，分别为1.76％和1.98％，远优于另外两种试样。改性磷酸盐涂料具有优异的防氧化性能和抗热震性能。Abstract: A modified phosphate coating on C/C composites used for aircraft brakes was made from zinc chloride, phosphoric acid, zinc phosphate and aluminum phosphate. In order to study the properties of the modified coating, an unmodified phosphate coating and a ceramic coating, which principally consists of silicon and boron, were also investigated. Results showed that all three coatings had excellent oxidation resistance at 500℃ for 100h and the maximum mass loss is 1.25%. The mass loss of the C/C composite with a modified phosphate coating was 1.76% when the composite was subjected to oxidation at 700℃ for 30h in air, and the value was 1.98% when the composite was subjected to thermal shock in air for 30 cycles (from 900℃ for 3min to at room temperature for 2min) followed by shock in air for 10 cycles (from 1100℃ for 3min to room temperature for 2min). The performance of the modified phosphate coating is the best among the three coatings. It has excellent oxidation resistance and thermal shock resistance.
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Key words:
- C/C composite /
- Oxidation resistance coatings /
- Phosphate
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