Jiang Tianxing, Zeng Yi, Xiong Xiang, Ye Ziming, Lun Huilin, Chen Shiyan, Hu Jinrun, Yang Ge, Gao Sen
State Key Laboratory of Powder Metallurgy, Central South University Changsha 410083 China
RSC Adv. 2021 May 7;11(28):16906-16912. doi: 10.1039/d1ra01971f. eCollection 2021 May 6.
Low-temperature reactive melt infiltration (LRMI) is advantageous for the fabrication of ceramic matrix composites (CMCs). However, residual metal in CMCs prepared by LRMI deteriorates the high-temperature properties. In this study, C/C-SiC composites containing ZrSi-Si were prepared using LRMI at 1400 °C, and the effect of heat treatment at 1400 °C for 10, 20, or 30 h on the microstructure and ablation properties of the composites fabricated using three different ternary alloys (, ZrBSi, ZrBSi, and ZrBSi) was investigated. The results show that the residual Si in the composites can be decreased by volatilisation and the reaction between Si and C during heat treatment, resulting in a decrease in the density and an increase in the SiC content. The ablation rates of the composites after heat treatment for 20 h were lower than those of the samples after heat treatment for 30 and 10 h. Among the three alloys, the composites prepared using ZrBSi demonstrated the best ablation performance. Their linear and mass ablation rates at 1911 °C were -0.11 μm s and 1.82 μg s, respectively.
低温反应熔体浸渗法（LRMI）对于陶瓷基复合材料（CMC）的制备具有优势。然而，通过LRMI制备的CMC中的残余金属会降低其高温性能。在本研究中，采用LRMI在1400℃制备了含ZrSi-Si的C/C-SiC复合材料，并研究了在1400℃下分别热处理10、20或30小时对使用三种不同三元合金（ZrBSi、ZrBSi和ZrBSi）制备的复合材料的微观结构和烧蚀性能的影响。结果表明，复合材料中的残余Si可通过热处理过程中的挥发以及Si与C之间的反应而减少，从而导致密度降低和SiC含量增加。热处理20小时后的复合材料的烧蚀率低于热处理30小时和10小时后的样品。在这三种合金中，使用ZrBSi制备的复合材料表现出最佳的烧蚀性能。它们在1911℃时的线性烧蚀率和质量烧蚀率分别为-0.11μm/s和1.82μg/s。
