Method for preparing a semi-conductive ceramic material,...

Details Method for preparing a semi-conductive ceramic material,... Method for preparing a semi-conductive ceramic material,...

2007-07-24

2007-07-24

Kopec, Mark (Department: 1751)

Compositions

Electrically conductive or emissive compositions

Metal compound containing

C252S520500, C264S104000

Reexamination Certificate

active

10963537

ABSTRACT:
Method for preparing a semi-conductive ceramic material, wherein:in a receptacle containing a liquid, there are mixed from 30 to 90% of a conductive phase based on Z1-xMxCrO3for 0≦×≦0.3, with Z being an element of the lanthanide group or a mixture of elements of this type, and M being calcium, strontium, magnesium, aluminum, titanium, yttrium or a mixture of two or more of these elements; from 8 to 60% of an insulating phase based on fine grains of alumina or tabular alumina or mullite or a mixture of two or more of these compounds; and from 0 to 10% of sintering additives;operations are carried out for milling, drying and sieving this mixture;this mixture is pressed;and this mixture is sintered in order to obtain a ceramic material having a porosity less than or equal to 25%.

REFERENCES:
patent: 4260872 (1981-04-01), Brodmann et al.
patent: 6632381 (2003-10-01), Sugimoto
patent: 04-108667 (1992-04-01), None
Duvigneaud et al “Factors Affecting the Sintering and the Electrical Properties of Sr-Doped LaCrO3”, Journal of the European Ceramic Society 14(1994) 359-367.

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