Influences of internal stress arising during carbonization of polycarbodiimide: Part II. Development of inhomogeneous microtexture and fragmentation of the carbon/carbon composite film

• Published in: Carbon (New York) 2001, Vol.39 (1), p.129-135
• Main Authors: Yamashita, J, Shioya, M, Hashimoto, T, Takaku, A
• Format: Article
• Language: English
• Subjects: A. Carbon/carbon composites, Glass-like carbon; Applied sciences; B. Carbonization; Building materials. Ceramics. Glasses; C. Optical microscopy; Ceramic industries; Chemical industry and chemicals; Chemical reactions and properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; D. Textures; Degradation; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Materials science; Miscellaneous; Organic polymers; Physicochemistry of polymers; Physics; Specific materials; Structure and morphology; thickness; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Technical ceramics; Thin film structure and morphology
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/S0008-6223(00)00100-7

Carbon/carbon composite films were prepared by using polycarbodiimide (PCDI) as a starting matrix and the inhomogeneous microtexture of the matrix developed by the internal stress arising during carbonization was investigated. The internal stress was produced due to constraint of the volume reduction of the matrix by the filler and, as a result, anisotropic regions were developed in the matrix around the filler. The internal stress occasionally caused fragmentation of the composite films during carbonization. When milled carbon fiber or graphite powder was used as a filler, fragmentation of the composite film was prevented.