Rapid Densification of Carbon/Carbon Composites Plate by Pressure-Gradient Chemical Vapor Infiltration

Xia Li Hong; Huang Bo Yun; Zhang Fu QinJin LeiChen DaTang Qian

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Rapid Densification of Carbon/Carbon Composites Plate by Pressure-Gradient Chemical Vapor Infiltration

机译：Rapid Densification of Carbon/Carbon Composites Plate by Pressure-Gradient Chemical Vapor Infiltration

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abstract_textpCarbon/carbon (C/C) composites plate is prepared in the temperature range 1 223-1 373 K by improved pressure-gradient chemical vapor infiltration (CVI). The bulk densities and pore distributions of C/C composites after different infiltration period are measured and the densification kinetics is investigated. The results show that C/C composites plate with 300 x 300 x 15 mm is able to be densified to 1.52 g cm(-3) within 60 h by pressure-gradient CVI. The porosity of pores with a size larger than 60 mu m reduces markedly and the large pores are able to be filled more effectively by pressure-gradient CVI. The densification kinetics depends on the temperature and competition between reaction and convection mass transport. The activation energy is about 366 kJ mol(-1) at 1 223-1 313 K and 43.2 kJ mol(-1) above 1 313 K./p/abstract_text

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来源
《advanced engineering materials》 |2017年第5期|共7页
作者
Xia Li Hong; Huang Bo Yun; Zhang Fu QinJin LeiChen DaTang Qian;
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作者单位

Cent S Univ, Powder Met Res Inst, State Key Lab Powder Met, Changsha 410083, Peoples R China;

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原文格式 PDF
正文语种英语
中图分类
关键词
THERMAL-GRADIENT; FORCED-FLOW; CVI PROCESS; REFRACTORY COMPOSITES; CARBON; FABRICATION; MICROSTRUCTURE; DEPOSITION; PREFORM; MODEL;

Rapid Densification of Carbon/Carbon Composites Plate by Pressure-Gradient Chemical Vapor Infiltration

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