Insulative composition and method of making articles therefrom
OwnerRichard A. Falkinventor
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Abstract
Disclosed herein is a method and composition of matter for constructing temperature resistant parts for the metal making industry from a mix of refractory fibers and Silca-carbon in the form of burned rice hull ash.
Claims8
A composition of matter comprising by weight:
- 30%-75% of rice hull ash compound of 85%-95% SiO.sub.2 and 15%-5% C;
- 65%-20% refractory fiber and the balance refractory cement.
A method of forming a refractory fiber product comprising the steps of providing a slurry of water and rice hull ash comprised of 85%-95% SiO.sub.2 and 15%-5% C;
- 70%-20% by weight of the ash refractory fiber;
- applying the mix to the inside of a vacuum mold;
- applying vacuum to draw the mix against the screen to remove the moisture therefrom and form an internal sleeve;
- adding a curing agent and drying the finished product at temperatures in the range of 100 degrees F. to 500 degrees F.
A composition for the housing of a molten metal sampler or the like comprising by weight:
- 50% refractory fiber;
- 50% powdered rice hull ash comprised of 84% SiO.sub.2, 15% C and 1% other elements and refractory cement to bond said composition together.
A composition for a ladle cover or the like comprising by weight:
- 30% high temperature refractory cement;
- 30% of 325 mesh SiO.sub.2 - C rice hull ash powder;
- 40% SiO.sub.2 - C 1/8th inch expanded rich hull ash granules with a particle size retained by 1/8th inch mesh screen and wherein said powder is comprised of 84% SiO.sub.2, 15% carbon, 1% other elements and the granules comprise 96% SiO.sub.2, 3% carbon and 1% other elements.
A high temperature resistant board comprising by weight:
- 25% high temperature refractory fiber;
- 20% high temperature refractory cement;
- 35% SiO.sub.2 - C rice hull ash powder, 325 mesh, said powder comprised of 86%-79% SiO.sub.2 and 13%-20% C;
- and, 20% SiO.sub.2 - C 1/8th inch particles 6-8 mesh comprised of 94%-98% SiO.sub.2 and 6%-2% C.
A composition for a ladle or the like comprising by weight:
- 40% high temperature long refractory fibers;
- 50% SiO.sub.2 - C rice hull ash powder, 325 mesh, comprised of 86%-79% SiO.sub.2 and 13%-20% C, 10% SiO.sub.2 - C expanded rice hull ash granules at 6-8 mesh with a silica-carbon ratio of 94%-98% SiO.sub.2 and 6%-2% carbon;
- and refractory cement to bond said composition together.
A high temperature resistant composition for ingot stool covers or the like comprising by weight:
- 171/2% of high temperature refractory fiber;
- 421/2% SiO.sub.2 - C rice hull ash comprised of 85% SiO.sub.2 -15% C powder, 325 mesh;
- 421/2% SiO.sub.2 - C expanded rice hull ash granules 6-8 mesh, said granules comprised of 94%-98% SiO.sub.2, 6%-2% C;
- and refractory cement to bond said composition together.
A composition for structural members consisting by weight:
- 30% cement selected from the group consisting of refractory cement or Portland cement;
- 30% 6-8 mesh rice hull ash containing SiO.sub.2 - C comprised of 95% SiO.sub.2 and 5% carbon;
- 35% 1/8th inch particle size SiO.sub.2 -C comprised of 94%-98% SiO.sub.2 and 6%-2% C and 5% high temperature refractory fiber.
Dependencies are inferred from the claim text.