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Chemical Strengthening of Polycrystalline Alumina
Author(s) -
KIRCHNER HENRY P.,
GRUVER ROBERT M.,
WALKER RALPH E.
Publication year - 1968
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.1151-2916.1968.tb13851.x
Subject(s) - crystallite , decomposition , flexural strength , materials science , chemical engineering , composite material , mineralogy , metallurgy , chemistry , organic chemistry , engineering
Low‐expansion solid solution surface layers formed by reaction of Cr 2 O 3 and Al 2 O 3 were used to chemically strengthen alumina bodies. The surface layers were formed by packing the samples in Cr 2 O 3 powder and heating to high temperatures. Fluorides or chlorides were added to the packing material, leading to substantial additional improvement. The flexural strengths of the control samples were increased by refiring in the presence of the products of decomposition of the fluorides. At high concentrations of fluorides in the packing material, the outside dimensions and the weights of the samples decreased during the treatments.