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C復合材料ZrB2-SiC基陶瓷涂層制備及燒蝕性能研究()

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中國材料進展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期數:: 2013年第11期

頁碼:: 022-32

欄目:: 特約研究論文

出版日期:: 2013-11-30

文章信息/Info

Title:: Preparation and ablation behavior of ZrB2-SiC coatings on C/C composites

作者:: 張天助; 陳招科; 熊翔; (中南大學粉末冶金國家重點實驗室湖南長沙 410083)

Author(s):: ZHANG Tianzhu; CHEN Zhaoke; XIONG Xiang; (State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

關鍵詞:: C/C復合材料; ZrB2-SiC涂層; 刷涂法; 抗燒蝕

分類號:: TB332

DOI:: 10.7502/j.issn.1674-3962.2013.11.04

摘要:: 為提高C/C復合材料的抗燒蝕性能，采用兩步刷涂-燒結法制備了ZrB2-SiC基陶瓷涂層。首先利用反應燒結制備ZrB2-SiC-ZrC過渡層，并在此基礎上制備了ZrB2-20%SiC-5%Si3N4、ZrB2-15%SiC-20%MoSi2、ZrB2-15%SiC-20%TaC三種外涂層。利用XRD和掃描電鏡研究了涂層的相組成和顯微形貌，并采用氧-乙炔焰燒蝕儀測試了涂層在2500℃、60s的抗燒蝕性能，探討了涂層的高溫燒蝕機理。結果表明：利用反應燒結制備的過渡層與基體結合緊密，且與外涂層無明顯分層現象，起到了良好的過渡作用；由于Si3N4及MoSi2起到了燒結助劑作用，使ZrB2-20%SiC-5%Si3N4、ZrB2-15%SiC-20%MoSi2外涂層結構較為致密；ZSS、ZSM涂層表現出了較好的抗燒蝕性能，其中ZSS涂層線燒蝕率及質量燒蝕率分別為0.075mm/s、0.0081g/s，ZSM涂層線燒蝕率及質量燒蝕率分別為0.018mm/s、0.0064g/s，而ZST涂層由于結構較為松散，未能起到有效的氧化防護，導致涂層被燒穿。

Abstract:: To improve the ablation resistance，ZrB2-SiC coatings were prepared by two-step slurry painting on C/C composites. The ZrB2-SiC-ZrC transition layer was prepared by reactive sintering,then ZrB2-20%SiC-5%Si3N4、ZrB2-15%SiC-20%MoSi2、ZrB2-15%SiC-20%TaC outer coating were prepared on it.The ablation test was conducted under oxy-acetylene torch at 2500℃ for 60s. X-ray diffractometry and scan electron microscopy were employed to investigate the microstructure and ablation mechanism.The results show that the transition layer had a good combination with the matrix,and no obvious lamination appeared when connected to the outer layer.Owing to the effect of Si3N4 and MoSi2 as sintering aids,the structure of ZrB2-20%SiC-5%Si3N4 and ZrB2-15%SiC-20%MoSi2 outer coating were quite dense.Coating ZSS and ZSM showed better ablation resistance.The linear ablative rate and mass ablative rate of coating ZSS and ZSM were 0.075mm/s, 0.0081g/s and 0.018mm/s,0.0064g/s respectively.The coating ZST did not show effective oxidation protection because of its loose structure,and it caused the burning through of the coating

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備注/Memo

備注/Memo:: 基金項目：國家重點基礎研究項目（2011CB605805）第一作者：張天助，男，1987年生，在讀碩士研究生收稿日期：基金項目：國家重點基礎研究項目（2011CB605805）第一作者：張天助，男，1987年生，在讀碩士研究生通訊作者：陳招科，男，1978年生，副研究員，E-mail：chenzhaoke2008@163.comZrB2-SiC基外涂層

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更新日期/Last Update: 2013-11-04

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