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Fiber‐Reinforced Ceramic‐Matrix Composites with a Polysiloxane/Boron‐Derived Matrix
Author(s) -
Suttor Daniel,
Erny Tobias,
Greil Peter,
Goedecke Holger,
Haug Tilman
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03058.x
Subject(s) - materials science , composite material , ceramic matrix composite , ceramic , silicon carbide , boron carbide , pyrolysis , fiber , thermogravimetry , borazine , boron nitride , boron , polymer , phase (matter) , ultimate tensile strength , chemical engineering , organic chemistry , chemistry , engineering
A ceramic matrix for carbon‐fiber‐reinforced ceramic‐matrix composites (CMCs) has been developed from poly‐siloxane/boron mixtures. Complex geometries can be realized by using standard technologies of fiber‐reinforced polymer composites. On pyrolysis, the polymer—filler mixture is converted to a ceramic matrix, consisting of silicon carbide, boron carbide, boron nitride, and a silicon oxycarbide (SiOC) glass, without reacting with the carbon fiber. Because of the large volume increase of the boron filler on nitridation (142 vol%), no multiple reinfiltration of the structure is necessary to achieve a dense matrix. Tensile strength and interlaminar shear strength exhibit maxima at a pyrolysis temperature of 1300°3C, where extensive fiber pullout is observed. Thermodynamic calculations have been used to evaluate the theoretical qualitative and quantitative phase compositions at equilibrium. Thermoanalytical (thermogravimetry—mass spectroscopy) and structural analysis (X‐ray diffractometry) have shown a satisfying coherence with respect to the condensed phases, whereas deviations have been noted with respect to the composition of the gas phase.