Refractories and methods of making same

Details Refractories and methods of making same Refractories and methods of making same

1974-06-10

1977-10-04

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Free metal containing

252513, 252519, 13 35, 252520, 252521, 252518, H01B 102, H01C 102

Patent

active

040523390

ABSTRACT:
It has been discovered that refractories at their elevated use temperatures have electrical properties unique to semi-conductors. The electrical conductivity of refractories is changed by altering the defects in the metallic or nonmetallic ions of the refractory lattice, and the purity is controlled to prevent fluxing from occurring at the grain boundaries. The discovery makes possible either the increase or decrease in electrical conductivity of any semi-conducting refractory, since the theory is applicable to both materials wherein the defects occur in the metal ions of the refractory lattice and also to materials wherein the defects occur in the nonmetallic ions of the refractory lattice.

REFERENCES:
patent: 2156608 (1939-05-01), Schon et al.
patent: 3185652 (1965-05-01), Kleber et al.
patent: 3284217 (1966-11-01), Walther, Jr.
patent: 3309209 (1967-03-01), Martinet et al.
patent: 3425851 (1969-02-01), Plumat et al.
patent: 3427390 (1969-02-01), Renkey et al.
patent: 3652304 (1972-03-01), Daniels

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