Premium
Properties of C/C‐SiC composites produced via transfer moulding and inner siliconization
Author(s) -
Ahmad Husam,
Stiller Jonas,
Päßler Erik,
Nestler Daisy,
Kroll Lothar,
Wagner Guntram
Publication year - 2020
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13548
Subject(s) - materials science , composite material , silicon , polymer , chemical vapor infiltration , transfer molding , composite number , metallurgy , mold
Short carbon fiber reinforced polymers (CFRP) are successfully prepared by transfer moulding technology. For this purpose, compounds on the basis of novolac/urotropin with different 6 mm chopped carbon fibers and silicon powder contents are produced utilizing a laboratory tempered sigma‐blade kneader. These compounds are then shaped into 46 × 8 × 3 mm 3 CFRP specimens using a transfer moulding machine. Depending on the material composition, the conversion to C/C‐SiC composites is performed through liquid silicon infiltration (LSI) process or inner siliconization. First, the short fiber content is varied between 30 and 50 wt% and its influence on the process and properties of the composites is studied. Second, an investigation of the inner siliconization through the co‐mixing of silicon powder (1‐23 wt% in CFRPs) during the compound production as well as a comparison with the external silicon infiltration process are presented and discussed. According to the results, the best mechanical properties are achieved at a fiber content of 40 wt% in the case of the external silicon infiltration and at silicon content below 14 wt% for composites produced by the inner siliconization process.