Sintered ceramic for high-stability thermistors and method for p

Details Sintered ceramic for high-stability thermistors and method for p Sintered ceramic for high-stability thermistors and method for p

1995-06-14

1997-08-26

Bonner, Melissa

Compositions: ceramic

Ceramic compositions

Refractory

252 623T, 252519, C04B 3536, C04B 3564, H01C 704

Patent

active

056610947

ABSTRACT:
A sintered ceramic for high-stability thermistors is based on Ni.sub.x Mn.sub.3-x O.sub.4, where x>0. The sintered ceramic has the general formula Cu.sub.z Fe.sub.1-y Ni.sub.x Mn.sub.2-x-z+y O.sub.4, where z=0 to 1.5; y =-0.1 to 0.02; and 1>z>0.5. A method for producing a sintered ceramic for high-stability thermistors includes converting a mixture of starting materials MnO.sub.x, NiO and Fe.sub.2 O.sub.3 into a stable ceramic of an iron-nickel-manganese oxide spinel phase with high thermal stability and aging stability. Another method for producing a sintered ceramic for high-stability thermistors includes calcining a mixture of nickel carbonate, manganese carbonate and .alpha.-iron (III) oxide by heating to over 600.degree. C. in air. After granulometric preparation and compression molding, sintered ceramic bodies are produced by sintering in air or in an oxygen atmosphere.

REFERENCES:
patent: 2645700 (1953-07-01), Morin
patent: 3510820 (1970-05-01), Jonker et al.
Siemens Zeitschrift 47, Jan. 1973, No. 1, pp. 65-67, (Walch).

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