Compositions for and synthesis of improved insulations
AssigneeMicropyretics Heaters International, Inc.
InventorSrinivas Penumella
Life of this patent
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Abstract
An insulation material which is substantially free of fibers and which has a density of less than about 2.5 g/cc and a thermal conductivity of less than about 5 W/Km is formed from a composition comprising at least about 2%, by weight, carbon. The insulation material is resistant to thermal shock and is easily machined.
Claims10
An insulation material, wherein the material is substantially free of fibers, has a density of less than about 2.5 g/cc and a thermal conductivity of less than about 5 W/Km, the insulation material being formed from a composition which is substantially free of pitch and which comprises:
- a. from about 2% to about 40%, by weight, carbon;
- b. an ingredient selected from the group consisting of Al.sub.2 O.sub.3, ZrO.sub.2, MgO, SiO.sub.2, and mixtures thereof, in an amount ranging from about 25% to about 95% by weight of the composition;
- c. carrier selected from the group consisting of water, clay, clay-water mixtures, polyvinyl alcohol, methanol, ethanol, acetone, polyvinyl butyl, methyl cellulose, stearates, colloidal silica, colloidal alumina, colloidal zirconia, colloidal silica and mixtures thereof, said carrier being present in an amount effective to aid in bonding;
- and
- d. an anti-oxidant elected from the group consisting of Al, B, Ca, Ce, Cr, Li, Mg, Ti, Zn, Zr and mixtures thereof, said anti-oxidant being present in an amount up to 20% by weight.
A paste composition comprising:
- a. from about 2 to about 40%, by weight, carbon;
- b. an ingredient selected from the group consisting of, and mixtures thereof, in an amount ranging from about 25% to about 95% by weight of the composition;
- c. a carrier selected from the group consisting of water, clay, clay-water mixtures, polyvinyl alcohol, methanol, ethanol, acetone, polyvinyl butyl, methyl cellulose, stearates, colloidal silica, colloidal alumina, colloidal zirconia, colloidal silica and mixtures thereof, said carrier being present in an amount effective to aid in bonding;
- and
- d. an anti-oxidant elected from the group consisting of Al, B, Ca, Ce, Cr, Li, Mg, Ti, Zn, Zr and mixtures thereof, said anti-oxidant being present in an amount up to 20% by weight;
- wherein the paste is substantially free of fibers and pitch.
Dependencies are inferred from the claim text.