Ceramic mixture having negative temperature co-efficient, a...

Details Ceramic mixture having negative temperature co-efficient, a... Ceramic mixture having negative temperature co-efficient, a...

2005-04-12

2005-04-12

Kopec, Mark (Department: 1751)

Compositions

Electrically conductive or emissive compositions

Metal compound containing

C338S0220SD, C338S0220SD

Reexamination Certificate

active

06878311

ABSTRACT:
A ceramic mixture composition having negative temperature coefficient of resistance (NTC), the said composition comprising about 95 weight % of the tetragonal form of Mn3O4and about 5 weight % of La2O3, the said ceramic mixture is mixed with stearic acid and wax, compacted and provided with two electrodes disposed from each other to form a thermistor having resistance on the order of mega ohm at a temperature of 25° C. and the resistance of the thermistor drops by almost 40% with every 20° C. rise in temperature and stabilizes to 250±50 ohms at a temperature range of 330° C.±6%.

REFERENCES:
patent: 6469612 (2002-10-01), Nakayama et al.
patent: 1-290549 (1989-11-01), None

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