C/C复合材料抗氧化复合涂层制备及其性能

Preparation and Properties of Multilayer Oxidation Resisting Coating for Carbon-carbon Composites

设计并制备出了一种C/C复合材料抗氧化涂层 ,其基本结构为浸渍过渡层 /陶瓷相阻挡层 /玻璃相封填层。涂覆有复合涂层的C/C复合材料试样在空气中于 90 0℃下氧化 10h的失重率仅为 0 0 34g/cm2 ,氧化失重速率为 5 67× 10 - 5g/ (cm2 ·min) ;90 0℃ 室温空气中急冷急热 10h循环 10 0次后 ,失重率为 8 4 1% ,涂层没有剥落 ,说明整个涂层具有良好的高温抗氧化性和抗热震性能。这种复合涂层可在中低温 (不大于 110 0℃ )氧化性气氛中长时间工作 ,适合作C/C复合材料航空刹车副等部件的抗氧化涂层 ,能够大大提高C/C复合材料的使用寿命和性能。

The author designed and prepared a multi layer oxidation resisting coating for C/C composites. The coating consits basically of a macerated transition layer, a ceramic phase barrier and a glassceram blockade. When the C/C composite covered with the coating is oxidized for 10 hours in air at 900 ℃, it has a weight ratio of only 0.034 g/cm 3 and a weight loss rate of 5 67×10 -5 g/cm 2. min; When it is cooled rapidly from 900 ℃ to room temperature and hearted rapidly from room temperature to 900 ℃ for 10 times in 10 hours, its weigh loss ratio is 8 41%, and no coating is peeled off. This indicates that this type of coating has good resitance to high temperature oxidation and thermal shock and can operate long in low and middle temperatare (not above 1000 ℃) atmospheres. This type of coating can be used as oxidation resisting coating of aircarft brake pieces of C/C composites, resulting in great enhance of brake piece′s service life.