Process for producing a shaped, sintered magnesia article having an enhanced resistance to hydration and an improved mechanical strength
AssigneeUbe Industries, Ltd.
InventorYasuhiko Toda
Life of this patent
Estimating the term…
Abstract
A shaped, sintered magnesia article having an enhanced hydration resistance and an improved mechanical strength is produced by evenly coating fine individual magnesia particles with silica coating layers containing an organic substance in an amount of 0.01% or less in terms of carbon, based on the molar amount of silicon in the silica coating layers; by shaping the silica-coated magnesia particles into a predetermined form; and by sintering the resultant shaped silica-coated magnesia particle article at an elevated temperature to an extent such that the silica coating layers are converted to corresponding forsterite coating layers.
Claims10
A process for producing a shaped, sintered magnesia article having an enhanced resistance to hydration and an improved mechanical strength, comprising the steps of:
- contacting fine magnesia particles with a vapor of an organic silicate compound at an elevated temperature to uniformly coat the surface of the fine magnesia particles with a silica coating layer containing organic substances in an amount not greater than about 0.01% in terms of carbon therein, based on the molar amount of silicon in the silica coating layer;
- shaping the silica-coated fine magnesia particles into a predetermined shape of a precursory magnesia article;
- and
- sintering the resultant precursory magnesia article at an elevated temperature to an extent such that the silica coating layer is converted to a corresponding foresterite coating layer.
Dependencies are inferred from the claim text.