Electrically semi-conducting ceramic body

Details Electrically semi-conducting ceramic body Electrically semi-conducting ceramic body

1976-03-31

1978-10-17

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Carbide containing

106 44, 252521, H01B 104

Patent

active

041208293

ABSTRACT:
A fired, electrically semi-conducting ceramic body is disclosed. The body consists essentially of silicon carbide particles having a median particle size from about 3 to about 25 microns dispersed in a bonding matrix. The silicon carbide particles constitute from about 50 to about 70 percent of the body. The body has an "apparent porosity" as subsequently defined herein from 20 to 40. The production of such a body from a batch composed of silicon carbide, alumina, silica and at least one oxide, carbonate or hydroxide of calcium, magnesium, barium or strontium is also disclosed. The batch is milled and pressed into a shape, and the resulting shape is then fired in an inert gas atmosphere to a temperature from about 2,300.degree. to 2,800.degree. F. for a time sufficiently long to produce a semi-conductor body having the requisite apparent porosity of from 20 to 40 percent.

REFERENCES:
patent: 3509072 (1970-04-01), Barrington et al.
patent: 3607790 (1971-09-01), Pitha

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