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Effect of Impurities on the Strength of Polycrystalline Magnesia and Alumina
Author(s) -
Rasmussen Jewell J.,
Stringfellow Gerald B.,
Cutler Ivan B.,
Brown Sherman D.
Publication year - 1965
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.1151-2916.1965.tb16051.x
Subject(s) - materials science , magnesium , oxide , impurity , solid solution , inorganic chemistry , solubility , crystallite , aluminium oxides , chemical engineering , metallurgy , chemistry , catalysis , biochemistry , organic chemistry , engineering
The bending strength of pure and alloyed magnesium oxide and aluminum oxide was studied. The magnesium oxide was doped with nickel oxide and cobalt oxide, both of which form a complete series of solid solutions with magnesia. The aluminum oxide was doped with ferric oxide which has limited solid solubility in aluminum oxide, with titanium dioxide which also has limited solid solubility in alumina, and with chromic oxide which forms a complete series of solid solutions with alumina. The modulus of rupture was corrected to a standard grain size and porosity to determine the intrinsic effects of the impurities on the modulus of rupture. The results indicate that the formation of NiO‐MgO and Coo‐MgO solid solutions increases the strength of MgO. The formation of Cr 2 O 3 ‐Al 2 O 3 , Fe 2 O 3 ‐Al 2 O 3 , and TiO 2 ‐Al 2 O 3 solid solutions, however, has no intrinsic effect on the strength of sintered alumina.