In situ reacted rare-earth hexaaluminate interphases
UNSPECIFIED. (1997) In situ reacted rare-earth hexaaluminate interphases. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 80 (7). pp. 1873-1876. ISSN 0002-7820Full text not available from this repository.
A novel in situ reaction between a ceria-doped zirconia interphase coating on Saphikon fibers and an outer alumina coating has resulted in the formation of oriented hexaaluminate platelets which can act as a low fracture energy interface barrier for crack deflection in oxide-oxide ceramic-matrix composites (CMCs). The reaction proceeds only in reducing environments where the reduction of the cerium and zirconium ions to their 3+ valent state causes a destabilization phenomenon consistent with previously reported findings. The diffusion of the cerium from the zirconia into solid solution with the alumina can stabilize the layered hexaaluminate structure. Preferred orientational growth of the hexaaluminate parallel to the coating interface was observed which is the required orientation for enhanced debonding at the fiber/matrix interface in long-fiber-reinforced CMCs.
|Item Type:||Journal Article|
|Subjects:||T Technology > TP Chemical technology|
|Journal or Publication Title:||JOURNAL OF THE AMERICAN CERAMIC SOCIETY|
|Publisher:||AMER CERAMIC SOC|
|Number of Pages:||4|
|Page Range:||pp. 1873-1876|
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