文章信息/Info

Title:

 Ablation Behavior and Mechanism of C/C ZrC Composites under Oxyacetylene Torch Flame

作者:

 楊鑫; 蘇哲安; 黃啟忠; 陳建勛

 （中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，湖南 長(zhǎng)沙 410083）

Author(s):

 YANG Xin;  SU Zhean;  HUANG Qizhong;  CHENG Jianxun

 (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)

關(guān)鍵詞:

 ; C/C復(fù)合材料; 基體改性; ZrC; 氧乙炔焰燒蝕��

文獻(xiàn)標(biāo)志碼:

A

摘要:

 采用基體改性技術(shù)將ZrC引入C/C復(fù)合材料中，制備了一種新型的C/C�瞆rC復(fù)合材料。通過(guò)氧乙炔焰燒蝕實(shí)驗(yàn)，研究了ZrC含量及燒蝕時(shí)間對(duì)C/C�瞆rC復(fù)合材料高溫耐燒蝕性能的影響。用XRD和TEM對(duì)燒蝕后材料的相組成和微觀結(jié)構(gòu)進(jìn)行了分析，結(jié)果表明，ZrC被氧化的主要生成物為ZrO��2，伴有少量ZrC和C，含26��46%ZrC的C/C�瞆rC復(fù)合材料，在氧乙炔焰燒蝕50 s后，在材料表面生成致密的ZrO��2膜，阻擋了氧對(duì)基體的擴(kuò)散，并有隔熱作用，有效保護(hù)復(fù)合材料被燒蝕和沖刷。實(shí)驗(yàn)表明，復(fù)合材料在高溫氧乙炔焰燒蝕20 s后，線燒蝕率和質(zhì)量饒蝕率分別為0��012 mm/s和0��003 3 g/s，比C/C復(fù)合材料分別降低7��6%和50%。��

Abstract:

 To improve the ablation resistance of C/C composites in severe environment, C/C�瞆rC composites were fabricated by inner�瞞odification method via introducing ZrC into C/C composites. The effect of ZrC content and ablation time on ablation property of C/C�瞆rC composites was investigated by oxyacetylene torch flame test, and the structure of C/C�瞆rC composites after ablation was studied by XRD and SEM analysis. The results show that the introduction of ZrC into C/C composites can effectively reduce the linear ablation rate and mass ablation rate of C/C composites, and relative high ZrC content is favorable for improving the ablation resistance of C/C composites. As ablation time increased, the linear ablation rate and mass ablation rate are further reduced. The improvement of ablation resistance is mainly attributed to the formation of ZrO��2 films in the ablation process.