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炭纤维增强的炭基体(C/C)复合材料是高能刹车装置中的一种新型材料,该材料在温度超过450℃之后即开始氧化。刹车时刹车盘温度升至600~900℃以上。在C/C盘上涂层再固化使之形成结实的涂层十分重要。涂层成份可以有Al2O3、SiO2、B2O3、CaF2、CeO2等。对各种组成和处理工艺的试样的耐高温、热震、抗氧化性能进行了研究。对典型的涂层配方进行DTA分析确定了涂层的合理固化温度。在SEM下观察防氧化性能最好和较差的试样的表面形貌和断口结构,发现氧化性能与表面涂层的工艺过程有关。涂浸TEOS、H3PO4、POCl3、H3BO4等之后再涂层的试样,获得的自弥合作用的硼硅玻璃或/和氟玻璃的抗氧化性能稳定。优化预涂浸后的涂层减少了由C/C材料和涂层热膨胀不匹配引起的裂纹,有较强的抗热应力和机械应力的能力
Carbon fiber reinforced carbon matrix (C / C) composites are a new type of material used in high-energy braking devices that begin to oxidize at temperatures in excess of 450 ° C. Brake brake temperature rose to 600 ~ 900 ℃ above. It is important to re-solidify the coating on the C / C plate to form a strong coating. Coating components can be Al2O3, SiO2, B2O3, CaF2, CeO2 and so on. The high temperature resistance, thermal shock resistance and oxidation resistance of the samples with various compositions and treatment processes were studied. DTA analysis of a typical coating formulation determines the reasonable curing temperature of the coating. The surface topography and fracture structure of the samples with the best and poor oxidation resistance were observed under SEM. The oxidation performance was found to be related to the surface coating process. After being coated with TEOS, H3PO4, POCl3, H3BO4 and the like, the anti-oxidation properties of self-closing borosilicate glass and / or fluorine glass obtained were stable. Optimized pre-dip coating reduces cracks caused by thermal expansion mismatch between the C / C material and the coating, with high resistance to thermal and mechanical stresses