Beneficiated lanthanum chromite for low temperature firing

Details Beneficiated lanthanum chromite for low temperature firing Beneficiated lanthanum chromite for low temperature firing

1991-01-22

1992-12-08

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 12, 501108, 501126, 501152, 252518, 252521, 423263, 423593, 423606, C04B 3504, C04B 3551, C04B 3542, C01G 3900

Patent

active

051698110

ABSTRACT:
A lanthanum chromite ceramic powder mixture that consists essentially of 1 mol of LaCr.sub.1-x M.sub.x O.sub.3, where M is a divalent metal selected from the group consisting of magnesium, calcium and mixtures thereof and x ranges from 0.03 to 0.3; y mols of B.sub.2 O.sub.3, where y ranges from 0.005 to 0.04; and z mols of La.sub.2 O.sub.3, where the ratio z/y ranges from 1.1 to 3. The mixture is formed into powder compacts and sintered to near full density at temperatures as low as 1400.degree. C.

REFERENCES:
patent: 4749632 (1988-08-01), Flandermeyer et al.
patent: 4830780 (1989-01-01), Olson et al.
patent: 4845056 (1989-07-01), Yamanis
Groupp & Anderson, J. Am. Cerm. Soc. 59, 449 (1976) "Densification of La.sub.1-x Sr.sub.x CrO.sub.3 ".
Meadowcroft & Wimmer, Am. Cerm. Soc. Bull. 58, 610 (1979), "Oxidation and Vaporization Processes in Lanthanum Chromite".

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