文章信息/Info

Title:

Comparative Study of C/C-HfC-SiC and C/C-HfC-ZrC-SiC Composites Fabricated by Reactive Melt Infiltration

文章編號:

1674-3962(2021)05-0394-07

作者:

劉芙群1; 譚杰1; 陳耘田2; 孫威2; 徐永龍2; 熊翔2

（1.中國運載火箭技術研究院, 北京 100076）（2.中南大學粉末冶金研究院, 湖南 長沙 410083）

Author(s):

LIU Fuqun1; TAN Jie1; CHEN Yuntian2;  SUN Wei2;  XU Yonglong2;  XIONG Xiang2

（1. China Academy of Launch Vehicle Technology, Beijing 100076, China） (2. Powder Metallurgy Institute, Central South University, Changsha 410083, China）

關鍵詞:

C/C-HfC-ZrC-SiC復合材料; C/C-HfC�睸iC復合材料; 抗燒蝕性能; 反應熔滲

Keywords:

C/C-HfC-ZrC-SiC composites;  C/C-HfC-SiC composites;  ablation resistance;  reactive melt infiltration

分類號:

TB33

DOI:

10.7502/j.issn.1674-3962.201911030

文獻標志碼:

A

摘要:

以C/C纖維預制體和Zr粉、Hf粉以及Si粉為原料，采用反應熔滲法制備了不同陶瓷相比例的HfC-SiC兩元陶瓷與HfC-ZrC-SiC三元陶瓷改性C/C復合材料，采用掃描電鏡(SEM)、能譜儀(EDS)、X 射線衍射儀（XRD)分析其形貌、成分和結構，對比了其微觀結構與抗燒蝕性能，探討了熔滲機理。結果表明，Si含量的增加有利于熔滲效果，但過量Si會降低燒蝕性能。當混合熔滲料中Si質量分數達到40%時，C/C-HfC-ZrC-SiC復合材料中細晶粒的ZrHfC固溶物分布最為均勻，有效提高了其抗燒蝕性能。燒蝕后，C/C-HfC-ZrC-SiC復合材料表面產生了一層完整致密的氧化層，而C/C-HfC-SiC復合材料表面形成了多孔的氧化層。HZS4（熔滲料中Hf,Zr和Si質量比為30∶30∶40）改性復合材料的質量燒蝕率和線燒蝕率分別為0.08 mg·cm-2·s-1和-3.30 μm·s-1，相比于HS4（熔滲料中Hf和Si質量比為60∶40）改性的復合材料，質量燒蝕率下降了46.7%。

Abstract:

Carbon/carbon composites modified by HfC-SiC and HfC-ZrC-SiC were fabricated by reactive melt infiltration. A comparative study of their microstructure, ablation behavior and infiltration mechanism was conducted by SEM, EDS and XRD. Results indicated that the increase of Si content was beneficial to the infiltration effect, but excess Si reduced composites-ablation performance. When the silicon mass fraction of infiltration mixture reached 40%, fine grains of ZrHfC solid solutions evenly distributed in the C/C�睭fC�瞆rC�睸iC composites, which significantly improved its ablation resistance. A dense and continuous oxide layer formed on the ablated surface of C/C-HfC-ZrC�睸iC composites, while for the C/C�睭fC�睸iC， the oxide scales were porous. C/C-HfC-ZrC-SiC exhibited better anti-ablation resistance, and the mass ablation rate and linear ablation rate of the composite(infiltrated with the mixture in which Hf, Zr and Si mass fraction ratio is 30∶30∶40) were 0.08 mg·cm-2·s-1 and -3.30 μm·s-1, respectively. Compared with C/C-HfC-SiC(infiltrated with the mixture in which Hf and Si mass fraction ratio is 60∶40), the mass ablation rate of C/C-HfC-ZrC-SiC decreased by 46.7%.