Dense chromium sesquioxide

Details Dense chromium sesquioxide Dense chromium sesquioxide

1973-05-14

1977-10-18

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

106 66, 264DIG57, 423607, F27B 904, C04B 3512

Patent

active

040546276

ABSTRACT:
A sintered, fine grained, polycrystalline, essentially fully dense, essentially single phase Cr.sub.2 O.sub.3 body is prepared by sintering Chromium Sesquioxide (Cr.sub.2 O.sub.3) at essentially the equilibrium oxygen partial pressure (P.sub.O.sbsb.2) for the formation of Cr.sub.2 O.sub.3 from its elements at the sintering temperature. To achieve optimum theoretical density a second metal oxide dopant such as MgO, capable of controlling the grain size, is added.
In addition, Cr.sub.2 O.sub.3 bodies are rendered more stable, and thus have a longer life, by maintaining over the body an atmosphere which is essentially equilibrium P.sub.O.sbsb.2 for the formation of Cr.sub.2 O.sub.3 from its elements at that temperature.

REFERENCES:
patent: 2714054 (1965-07-01), Voltz
patent: 3117093 (1964-01-01), Arthur et al.
patent: 3451771 (1969-06-01), Cox et al.
patent: 3600484 (1971-08-01), Smoke et al.
Lovell, "The Firing Expansions of Certain Chrome-Magnesia Products", Trans. Brit. Cer. Soc., pp. 369-383, (1952).
Campbell et al., High Temperature Material and Technology, p. 278, (1967).
Lovell, "The Firing Expansions of Certain Chrome-Magnesite Products", Transactions of the British Ceramic Society, 1952.
Ownby et al., "Final Sintering of Cr.sub.2 O.sub.3," J. Am. Cer. Soc. 55, [9] pp. 433-436.
Jungquist, "Final Sintering of Cr.sub.2 O.sub.3 with Minor Additions of MgO and Sintering of MgO with Minor Additions of Cr.sub.2 O.sub.3 ", M.S. Thesis, U. Missouri, 1971.

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