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二硼化锆基超高温陶瓷的制备及性能(英文)
作者:王海龙 汪长安 张锐 黄勇 方岱宁  
单位:郑州大学材料科学与工程学院 清华大学 新型陶瓷与精细工艺国家重点实验室 郑州大学材料科学与工程学院 清华大学 新型陶瓷与精细工艺国家重点实验室 清华大学航空航天学院  郑州450000 清华大学 新型陶瓷与精细工艺国家重点 实验室 北京 100084 北京100084 郑州450000 北京100084 北京100084 
关键词:超高温陶瓷  二硼化锆  热压烧结  性能 
分类号:TQ174.758.1
出版年,卷(期):页码:2007,35(12):1590-1594
DOI:
摘要:

用碳化硅(SiC)颗粒增韧二硼化锆(ZrB2)陶瓷,在氩气流中热压烧结温度为1950℃、保温1h,20MPa压力下成功制备出了致密的ZrB2/SiCp复合材料。ZrB2/SiCp复合材料的致密度随着SiC颗粒添加量的增加而增加。当SiC颗粒的体积分数(下同)为15%时,相对致密度达到100%。ZrB2/SiCp复合材料的抗弯强度和断裂韧性都随着SiC添加量的增加成上升趋势,当SiC颗粒的添加量在15%时同时达得最大值,分别为646MPa和8.52MPa·m1/2。SiCp的添加还提高了ZrB2/SiCp复合材料的耐氧化烧蚀性能。

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Zirconium diboride (ZrB2)-based ultra-high temperature ceramics (UHTC) reinforced by silicon carbide (SiC) particles were prepared by hot press sintering at 1 950 ℃ for 1 h under 20 MPa pressure in an argon flow. The relative density of ZrB2/SiCp composites increased with the content of SiC addition, and reached 100% when 15% (in volume) SiC particles were added. The bending strength and toughness of the composites also increased with increasing SiC amount, and reached values of 646 MPa and 8.52 MPa·m1/2, respectively, at 15% SiC addition. Furthermore, the addition of SiC particles improved the resistance to oxida- tion/ablation of ZrB2/SiCp composites.

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基金项目:
“973”计划(5133102–4)资助项目。
作者简介:
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参考文献:

[1] MONTEVERDE F. The thermal stability in air of hot-pressed diboride matrix composites for uses at ultra-high temperatures [J]. Corros Sci, 2005,47: 2 020–2 033. [2] RAFFAELE S, MARIO S F, DIEGO P. Aerothermodynamic study of UHTC-based thermal protection systems [J]. Aerospace Sci Technol, 2005, 9: 151–160. [3] MONTEVERDE F, BELLOSI A, GUICCIARDI S. Processing and properties of zirconium diboride-based composites [J]. J Eur Ceram Soc, 2002, 22: 279–288. [4] UPADHYA K, YANG J M , HOFFMANN W P. Materials for ultrahigh temperature structural applications [J]. Am Ceram Soc Bull, 1997, 58: 51–56. [5] KHANRA A K, GODKHINDI M M. Effect of Ni additives on pres- sureless sintering of SHS ZrB2 [J]. Adv Appl Ceram, 2005, 104(6): 273–276. [6] MEDR V, MONTEVERDE F, BALBO A, et al. Comparison of ZrB2–ZrC–SiC composites fabricated by spark plasma sintering and hot-pressing [J]. Adv Eng Mater, 2005, 7(3): 159–163. [7] MONTEVERDE F, BELLOSI A. Oxidation of ZrB2-based ceramics in dry air [J]. J Electrochem Soc, 2003, 150(11): B552–B559. [8] OPILA E, LEVINE S. Oxidation of ZrB2- and HfB2-based ultra-high temperature ceramics: effect of Ta additions [J]. J Mater Sci, 2004, 39: 5 969–5 977. [9] OPEKA M M, TALMY I G, ZAYKOSKI J A. Oxidation-based materials selection for 2 000 ℃ hypersonic aerosurfaces: theoretical consi- derations and historical experience [J]. J Mater Sci, 2004, 39: 5 887– 5 904. [10] SCITI D, BRACH M, BELLOSI A. Long-term oxidation behavior and mechanical strength degradation of a pressurelessly sintered ZrB2– MoSi2 ceramic [J]. Scripta Mater, 2005, 53: 1 297–1 302.

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