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Rapid Densification of Carbon/Carbon Composites Plate by Pressure‐Gradient Chemical Vapor Infiltration
Author(s) -
Xia Li Hong,
Huang Bo Yun,
Zhang Fu Qin,
Jin Lei,
Chen Da,
Tang Qian
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201600329
Subject(s) - chemical vapor infiltration , materials science , composite material , infiltration (hvac) , kinetics , porosity , activation energy , temperature gradient , reinforced carbon–carbon , pressure gradient , carbon fibers , concentration gradient , composite number , chemistry , physics , quantum mechanics , mechanics , environmental chemistry
Carbon/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 × 300 × 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 µm 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.