PICA-X的制备及其炭化前后性能研究
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摘要
采用不同浓度热塑性酚醛树脂溶液浸渍莫来石纤维毡,经过溶胶-凝胶反应和常压干燥后,制备出酚醛浸渍陶瓷烧蚀体(PICA-X,0.45~0.50 g/cm~3),后研究了其炭化前后微观形貌、力学、隔热及抗氧化性能。结果表明:PICA-X具有莫来石纤维增强酚醛气凝胶复合结构,其弯曲强度为26.7~34.0 MPa,热导率为36~40 m W/(m·K)。经过1 000℃炭化后,C-PICA-X的弯曲强度为13.9~14.5 MPa,热导率为41~45m W/(m·K);PICA-X炭化前后均表现出较好的抗氧化性能。
Phenolic impregnated ceramic ablator( PICA- X) were prepared by impregnation of novolac phenolic resin solutions into mullite fiber mat,followed by so-gel reaction and ambient drying. The density of the PICA- X could be adjusted in a range of 0. 45 to 0. 50 g / cm3 by using different concentrations of novolac phenolic resin solutions. The microstructure,mechanical property,thermal insulation property and thermal stability of PICA- X before and after carbonization were systematically investigated. PICA- X,which are composed of phenolic aerogel reinforced by mullite fiber,exhibit excellent mechanical strength of 26. 7 to 34. 0 MPa and low thermal conductivity of 36 to 40 m W /( m·K). After carbonization at 1 000℃,the flexural strength and thermal conductivity of the resulting C- PICA- X are 13. 9 to 14. 5 MPa and 41 to 45 m W /( m·K),respectively. In addition,PICA- X exhibits good oxidation resistance before and after carbonization.
Phenolic impregnated ceramic ablator( PICA- X) were prepared by impregnation of novolac phenolic resin solutions into mullite fiber mat,followed by so-gel reaction and ambient drying. The density of the PICA- X could be adjusted in a range of 0. 45 to 0. 50 g / cm3 by using different concentrations of novolac phenolic resin solutions. The microstructure,mechanical property,thermal insulation property and thermal stability of PICA- X before and after carbonization were systematically investigated. PICA- X,which are composed of phenolic aerogel reinforced by mullite fiber,exhibit excellent mechanical strength of 26. 7 to 34. 0 MPa and low thermal conductivity of 36 to 40 m W /( m·K). After carbonization at 1 000℃,the flexural strength and thermal conductivity of the resulting C- PICA- X are 13. 9 to 14. 5 MPa and 41 to 45 m W /( m·K),respectively. In addition,PICA- X exhibits good oxidation resistance before and after carbonization.
引文
[1]LAUB B,VENKATAPATHY E.Planetary Probe Atmospheric Entry and Descent Trajectory Analysis and Science,October 6-9,2003[C].Netherlands:ESA Publications Division,2004.
[2]TRAN H,JOHNSON C,RASKY D,et al.31stThermophysics Conference,June 17-20,1996[C].Reston:American Institute of Aeronautics and Astronautics,1996.
[3]TRAN H,JOHNSON C,HSU M T,et al.32ndThermophysics Conference,June 23-25,1997[C].Reston:American Institute of Aeronautics and Astronautics,1997.
[4]WILLCOCKSON W H.Stardust sample return capsule design experience[J].Journal of Spacecraft and Rockets,1999,36(3):470-474.
[5]MILOS F S,CHEN Y K.Ablation and thermal response property model validation for phenolic impregnated carbon ablator[J].Journal of Spacecraft and Rockets,2010,47(5):786-805.
[6]JOHNSON S M,GASCH M J,LEISER D,et al.15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference,April 28-May 1,2008[C].Reston:American Institute of Aeronautics and Astronautics,2008.
[7]NOWLIN S,THIMONS L.Surviving the heat:the application of phenolic impregnated carbon ablators[C/OL].(2013-02-01)[2016-02-26].http://136.142.82.187/eng12/history/spring2013/pdf/3131.pdf.
[8]贾献峰,刘旭华,乔文明,等.酚醛浸渍碳烧蚀体(PICA)的制备、结构及性能[J].宇航材料工艺,2016,46(1):77-80.
[2]TRAN H,JOHNSON C,RASKY D,et al.31stThermophysics Conference,June 17-20,1996[C].Reston:American Institute of Aeronautics and Astronautics,1996.
[3]TRAN H,JOHNSON C,HSU M T,et al.32ndThermophysics Conference,June 23-25,1997[C].Reston:American Institute of Aeronautics and Astronautics,1997.
[4]WILLCOCKSON W H.Stardust sample return capsule design experience[J].Journal of Spacecraft and Rockets,1999,36(3):470-474.
[5]MILOS F S,CHEN Y K.Ablation and thermal response property model validation for phenolic impregnated carbon ablator[J].Journal of Spacecraft and Rockets,2010,47(5):786-805.
[6]JOHNSON S M,GASCH M J,LEISER D,et al.15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference,April 28-May 1,2008[C].Reston:American Institute of Aeronautics and Astronautics,2008.
[7]NOWLIN S,THIMONS L.Surviving the heat:the application of phenolic impregnated carbon ablators[C/OL].(2013-02-01)[2016-02-26].http://136.142.82.187/eng12/history/spring2013/pdf/3131.pdf.
[8]贾献峰,刘旭华,乔文明,等.酚醛浸渍碳烧蚀体(PICA)的制备、结构及性能[J].宇航材料工艺,2016,46(1):77-80.