Refractory composition resistant to high temperature shock and creep
AssigneeMagneco/Metrel, Inc.
InventorsMichael W Anderson, Daniel Snyder, Lara Binz, Eric Boring
Life of this patent
Estimating the term…
Abstract
A refractory composition yields refractory articles having excellent resistance to high-temperature thermal shock and creep. The refractory composition is based primarily on chamotte having controlled particle sizes, and may also include mullite, fused silica, calcined alumina and microsilica, having controlled particle sizes. The refractory composition includes an aqueous colloidal silica binder that provides excellent castability and binding between the ingredients following drying.
Claims20
A refractory composition, comprising, based on the weight of the composition:
- about 50% to about 90% by weight chamotte;
- about 5% to about 25% by weight mullite;
- about 3% to about 20% by weight fused silica;
- about 0.5% to about 4% by weight calcined alumina;
- and
- about 3% to about 30% by weight of an aqueous colloidal silica binder that includes about 20% to about 70% by weight colloidal silica particles and about 30% to about 80% by weight water based on the weight of the binder.
A refractory composition comprising, based on the dry weight of the refractory composition:
- about 55% to about 95% by weight chamotte;
- about 10% to about 30% by weight mullite;
- about 5% to about 25% by weight fused silica;
- about 1% to about 5% by weight microsilica;
- and
- about 2% to about 25% by weight colloidal silica particles having a mean particle diameter of about 1 to about 100 nanometers.
A refractory article comprising, based on the dry weight of the refractory article:
- about 55% to about 95% by weight chamotte;
- about 10% to about 30% by weight mullite;
- about 5% to about 25% by weight fused silica;
- and
- about 2% to about 25% by weight colloidal silica particles having a mean particle diameter of about 1 to about 100 nanometers;
- wherein the chamotte comprises, based on the weight of the chamotte:
- about 35% to about 65% by weight of a first chamotte component having screen mesh particle sizes ranging from 2380 to 6730 microns;
- about 10% to about 35% by weight of a second chamotte component having screen mesh particle sizes ranging from 841 to less than 2380 microns, and
- about 15% to about 45% by weight of a third chamotte component having screen mesh particle sizes less than 841 microns.
A refractory composition, comprising chamotte and about 3% to about 30% by weight of an aqueous colloidal silica binder, wherein the chamotte comprises, based on the weight of the chamotte:
- about 35% to about 65% by weight of a first chamotte component having screen mesh particle sizes ranging from 2380 to 6730 microns;
- about 10% to about 35% by weight of a second chamotte components having screen mesh particles sizes ranging from 841 to less than 2380 microns, and about 15% to about 45% by weight of a third chamotte component having screen mesh particles sizes less than 841 microns.
Dependencies are inferred from the claim text.