Conductive compositions and processes therefor

Claim 2

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, at a temperature in the range of about 800° to 1350°C. to produce said glassy-ceramic body.

Claim 3

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, at an elevated temperature to effect fusion, grinding the resulting fused product to a powder, admixing said powder with finely divided refractory diluent in the proportions of at least 30% by weight of glass-forming material and at most 70% by weight of refractory diluent, and heating the resulting admixture at a temperature in the range of about 800° to 1350°C. to produce said glassy-ceramic body.

Claim 4

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, at an elevated temperature to effect fusion, grinding the resulting fused product to a powder, admixing said powder with finely divided refractory diluent in the proportions of at least 30% by weight of glass-forming material and at most 70% by weight of refractory diluent, and heating the resulting admixture at a temperature in the range of about 800° to 1350°C. to produce said glassy-ceramic body.

Claim 5

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof at a temperature above the softening temperature of said glass-ceramic-forming material, and cooling the resulting material to produce said glass-ceramic body.

Claim 6

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof at a temperature above the softening temperature of said glass-ceramic-forming material, and cooling the resulting material to produce said glass-ceramic body.

Claim 7

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, at a temperature between the softening temperature of said admixture and the temperature at which bubbles form in said glassy-ceramic forming material and cooling the resulting material to form said glassy-ceramic body.

Claim 8

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, at a temperature between the softening temperature of said admixture and the temperature at which bubbles form in said glassy-ceramic forming material and cooling the resulting material to form said glassy-ceramic body.

Claim 9

A process for the preparation of a vitreous body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with vitreous-ceramic forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said vitreous-ceramic forming material and cooling the resulting material to form said vitreous body.

Claim 10

A process for the preparation of a vitreous body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with vitreous-ceramic forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said vitreous-ceramic forming material and cooling the resulting material to form said vitreous body.

Claim 11

A glassy-ceramic body made by the process of claim 3.

Claim 12

A glassy-ceramic body made by the process of claim 4.

Claim 13

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glassforming constituents, and mixtures thereof, at a temperature in the range of about 800° to 1350°C. to produce a hard, refractory, conductive body.

Claim 14

A process for the preparation of a glassy-ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glassforming constituents, and mixtures thereof, at a temperature in the range of about 800° to 1350°C. to produce a hard, refractory, conductive body.

Claim 15

The process of claim 8 wherein the Group 6b metal is chromium.

Claim 16

The process of claim 8 wherein the glassy-ceramic-forming material is frit.

Claim 17

The process of claim 8 wherein the glassy-ceramic-forming material has finely divided refractory diluent added thereto in the proportions of at least 30% by weight of glassy-ceramic-forming material and at most 70% by weight of refractory diluent.

Claim 18

The process of claim 8 wherein the total weight of metals does not exceed 50% by weight of the finely divided admixture, and said total weight of metals includes about 70% to 99% by weight of chromium.

Claim 19

The process of claim 8 wherein the glassy-ceramic-forming material is frit and is diluted with finely divided kaolin in the proportions of at least 30% by weight of frit and at most 70% by weight of kaolin.

Claim 20

A process for the preparation of a glassy-ceramic-body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, at an elevated temperature to effect fusion, grinding the resulting fused product to a powder, admixing said powder with finely divided refractory diluent, and heating the resulting admixture at a temperature in the range of about 800° to 1350°C. to produce a hard, refractory, conductive body.

Claim 21

A process for the preparation of a glassy-ceramic-body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with glassy-ceramic-forming material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, at an elevated temperature to effect fusion, grinding the resulting fused product to a powder, admixing said powder with finely divided refractory diluent, and heating the resulting admixture at a temperature in the range of about 800° to 1350°C. to produce a hard, refractory, conductive body.

Claim 22

The process of claim 14 wherein the Group 6b metal is chromium.

Claim 23

The process of claim 14 wherein the glassy-ceramic-forming material together with the refractory diluent is at least 50% by weight of the resulting admixture.

Claim 24

The process of claim 14 wherein the glassy-ceramic-forming material is frit and the refractory diluent is kaolin.

Claim 25

A ceramic body having electrically conductive characteristics made by the process of claim 8.

Claim 26

A ceramic body having electrically conductive characteristics made by the process of claim 9.

Claim 27

A ceramic body having electrically conductive characteristics made by the process of claim 14.

Claim 28

A process for the preparation of a ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with fusible ceramic material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said fusible ceramic material and cooling the resulting material to form said ceramic body.

Claim 29

A process for the preparation of a ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of about 1 to 30% by weight of boron and 99 to 70% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with fusible ceramic material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said fusible ceramic material and cooling the resulting material to form said ceramic body.

Claim 30

A ceramic body made by the process of claim 21.

Claim 31

A process for the preparation of a ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of boron and a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, which metal may be in elemental, alloy, boride or sulfide form, with fusible ceramic material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said fusible ceramic material and cooling the resulting material to form said ceramic body.

Claim 32

A process for the preparation of a ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of boron and a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, which metal may be in elemental, alloy, boride or sulfide form, with fusible ceramic material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said fusible ceramic material and cooling the resulting material to form said ceramic body.

Claim 33

A process for the preparation of a ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of boron and up to 99% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with fusible ceramic material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said fusible ceramic material, and cooling the resulting material to form said ceramic body.

Claim 34

A process for the preparation of a ceramic body having desired electrical characteristics which comprises heating a finely divided admixture of boron and up to 99% by weight of a Group 6b metal selected from chromium, molybdenum, tungsten, and mixtures thereof, based on the total weight of metals present which may be in elemental, alloy, boride or sulfide form, with fusible ceramic material selected from silica glasses, borate glasses, phosphate glasses, slags, fluorite, frits, clays having natural glass-forming constituents, and mixtures thereof, to a temperature above the softening point of said fusible ceramic material, and cooling the resulting material to form said ceramic body.

Claim 35

A ceramic body made by the process of claim 23.