摘要
采用高温熔渗反应(RMI)工艺制备了密度为2.50 g/cm^(3)的C/C-ZrC-TiC-SiC复合材料,并通过氧乙炔火焰烧蚀实验系统研究其高温耐烧蚀性能。在热流密度为4.2 MW/m^(2)条件下烧蚀30 s后,材料的线烧蚀率和质量烧蚀率分别为0.06600 mm/s和0.00411 g/s。烧蚀过程中,中心区因温度极高,SiO_(2)大量蒸发及剥蚀消耗,表面形成以ZrO_(2)、ZrTiO_(4)和TiO_(2)为主的Zr-Ti-O氧化层。过渡区中,熔融SiO_(2)相渗入并封堵基体孔隙,与Zr-Ti-O氧化物共同形成连续致密的氧化膜覆盖于表面,有效阻隔氧气侵入,减缓基体进一步氧化侵蚀。而在边缘区,剥落的SiO_(2)颗粒和晶须在表面堆积,形成致密的SiO_(2)保护层,进一步提高了复合材料的抗烧蚀性能。
The C/C-ZrC-TiC-SiC composites with a density of 2.50 g/cm^(3)were fabricated by the high-temperature reactive melt infiltration(RMI)method.The high-temperature ablation resistance of C/C-ZrC-TiC-SiC composites was investigated by oxyacetylene flame ablation test.After 30 s ablation under the flame with a heat of 4.2 MW/m^(2),the linear and mass ablation rates are 0.06600 mm/s and 0.00411 g/s,respectively.Due to the highest temperature at the ablation center,the continuous consuming and denudation of SiO_(2)resulted in the formation of a Zr-Ti-O(ZrTiO_(4),TiO_(2))oxide layer on the central surface.In the transition area,the residual SiO_(2)melt sealed the pores and combined with Zr-Ti-O oxides to form a continuous protective film covering the surface,which can effectively prevent the further erosion of the inner matrix.Moreover,the scoured SiO_(2)particles and whiskers from ablation center are deposited on the surface of ablation brim,forming a continuous SiO,layer to further enhance the ablation resistance of the composites.
作者
欧阳康
杨鑫
张夏翔
左远名
黄启忠
OUYANG Kang;YANG Xin;Zhang Xia-xiang;Huang Qi-zhong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《炭素》
2025年第2期27-35,共9页
Carbon
作者简介
欧阳康(2001-),男,硕士研究生,主要研究方向为C/C复合材料耐烧蚀性能研究,E-mail:19313096243@163.com。
