文章信息/Info

Title:

Ablation behaviors of matrix modified C/C-HfC-HfB2-SiC composites

作者:

孟祥利1; 2; 崔 紅2; 閆聯生2; 張 強2; 宋麥麗2; 朱陽 2

(1.西北工業大學材料學院 西安710072;)(2.西安航天復合材料研究所 西安710025)

Author(s):

MENG Xiangli1; 2;  CUI Hong2;  YAN Liansheng2;  ZHANG Qiang2;  SONG Maili2;  Zhu Yang2

(1.School of materials Science and Engineering, Northwestern Polytechnical University, Xin 710072, China)(2 Xi’an Aerospace Composites Research Institute, Xin 710025, China.)

關鍵詞:

C/C-HfC-HfB2復合材料; 電弧風洞; 抗燒蝕; 前驅體浸漬裂解

DOI:

10.7502/j.issn.1674-3962.2013.11.03

摘要:

以碳化鉿有機前驅體、硼化鉿有機前驅體和聚碳硅烷混合溶液為浸漬劑, 采用化學氣相滲透（CVI）和液相浸漬-裂解(PIP)工藝制得了準3D C/C-HfB2-HfC-SiC碳陶復合材料。采用電弧風洞結合掃描電子顯微鏡（SEM）和X射線衍射分析（XRD）對復合材料的結構及氧化失效行為進行了初步探討。結果表明，高密度的基體改性C/C-HfB2-HfC-SiC復合材料具有良好的抗燒蝕性能，復合材料在2300K/600s電弧風洞（含水5%）試驗條件下的質量燒蝕率和線燒蝕率分別僅為1.22×10-6 g/(cm2·s) 和 1.33×10-5mm/s。密度和溫度對復合材料抗燒蝕性能影響較大，密度從2.63g/cm3增加到3.75g/cm3時，復合材料在2300k條件下的線燒蝕率降低了三個數量級，當溫度從2300k升高的2400k時，材料的線燒蝕率增加了約1000倍，燒蝕過程中較高密度的復合材料表面容易形成更為致密的氧化膜是其具有良好的抗氧性能的重要因素。

Abstract:

The quasi three dimension carbon/carbon-hafnium carbide-hafnium diboride杝ilicon carbide (3D C/C-HfC-HfB2-SiC) composites, which made use of a hybrid precursor contained polycarbosilane and organic HfB2 polymeric precursor and organic HfC polymeric precursor, were prepared through chemical vapor infiltration (CVI) and then treated by precursor infiltration and pyrolysis (PIP) process. The components and microstructures of the ablated samples were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis，respectively. The results show that C/C-HfC-HfB2-SiC composites with high density have wonderful anti-ablation properties. After ablation at 2300k (5wt.% H2O contained) for 600s via arc heated wind tunnel test, the mass loss and linear recession rate is as low as 1.22?0-6 g/(cm2穝) and 1.33?0-5mm/s, respectively. Density and temperature were two very important factors to anti-ablation of the composites. The linear recession rate of the composites decreased three orders of magnitude when density of the composites increased form 2.63g/cm3 to 3.75g/cm3. And the linear recession rate rised by one thousand times from 2300k to 2400k. It is found that during ultra-high temperature stage, a high density membrane could easier got on the surface of the high density composites. It could effectively cover the ablation surface and therefore promote its anti-ablation property