Air-sinterable lanthanum chromite and process for its preparatio

Details Air-sinterable lanthanum chromite and process for its preparatio Air-sinterable lanthanum chromite and process for its preparatio

1992-11-25

1994-02-15

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501126, 501132, 423352, 423592, 423595, 423606, 423604, 423622, 264 82, 264 83, C04B 3504, C04B 3551, C01G 3900

Patent

active

052866866

ABSTRACT:
A sinter-reactive lanthanum chromite powder is prepared from the lanthanum chromite precursor LaCr.sub.1-x M.sub.x O.sub.3 (Adsorbate). The powder is crystalline, has the formula LaCr.sub.1-x M.sub.x O.sub.3, where M is selected from the group consisting of zinc, copper and mixtures thereof and x ranges from about 0.02 to 0.2, and sinters to densities higher than about 95% of theoretical density at temperature as low as 1400.degree. C. in oxidizing atmospheres. Sintering to such high density at temperatures in the vicinity of 1400.degree. C. makes the powder particularly suited for use as interconnect material for solid oxide fuel cells.

REFERENCES:
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patent: 5169811 (1992-12-01), Cipollini et al.
patent: 5185301 (1993-02-01), Li et al.
Groupp & Anderson, "Densification of La.sub.1-x Sr.sub.x CrO.sub.3 ", J. Am. Cer. Soc., 59, p. 449 (1976).
Meadowcroft & Wimmer, "Oxidation and Vaporization Processes in Lanthanum Chromite", Am. Ceram. Soc. Bull., vol. 58, pp. 610-613 (1979).
Vidyasagar et al. "Synthesis of Compolex Metal Oxides Using Hydroxide, Cyanide and Nitrate Solid Solution Precursors", J. Solid State Chem., 58, 29-37 (1985).
Hayashi et al. "Sintering of lanthanum chromite doped with zinc or copper", J. Mater. Sci. Lett., vol. 7, pp. 457-458 (1988).

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