Spherical metal-oxide powder particles and process for their manufacture
AssigneeVAW silizium GmbH
InventorsReinhard Feige, Friedhelm Bramsiepe
Life of this patent
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Abstract
Spherical metal-oxide powder particles are used as finely ground raw and filler materials in mineral, ceramic and refractory construction, technical and auxiliary materials, as well as for polishing and grinding agents. There is a process for producing the powder particles, and there is a process for treating ceramic and refractory residual materials.
Claims10
Spherical and spherically shaped metal-oxide powder particles containing 35% to 95% by weight Al.sub.2 O.sub.3, and at least one metal oxide selected from the group consisting of SiO.sub.2, MgO, and CaO, said particles having
- (a) a crystalline phase of a predominantly gamma aluminum oxide;
- (b) a microstructure of a melt solidified in a glassy-amorphous phase;
- (c) a size distribution in which more than 50% by weight is in the diameter range of 0.2 to 2 .mu.m;
- and
- (d) a carbon content of 0.1% to 3% by weight;
- with all percents by weight based upon the total particle composition weight.
A blasting agent comprising
- spherical and spherically shaped metal-oxide powder particles containing 35% to 95% by weight Al.sub.2 O.sub.3, and at least one metal oxide selected from the group consisting of SiO.sub.2, MgO, and CaO, said particles having
- (a) a crystalline phase of a predominantly gamma aluminum oxide;
- (b) a microstructure of a melt solidified in a glassy-amorphous phase;
- (c) a size distribution in which more than 50% by weight is in the diameter range of 0.2 to 2 .mu.m;
- and
- (d) a carbon content of 0.1% to 3% by weight;
- with all percents by weight based upon the total particle composition weight, useful for the surface treatment of metallic, mineral and ceramic materials.
A buffing agent comprising
- spherical and spherically shaped metal-oxide powder particles containing 35% to 95% by weight Al.sub.2 O.sub.3, and at least one metal oxide selected from the group consisting of SiO.sub.2, MgO, and CaO, said particles having
- (a) a crystalline phase of a predominantly gamma aluminum oxide;
- (b) a microstructure of a melt solidified in a glassy-amorphous phase;
- (c) a size distribution in which more than 50% by weight is in the diameter range of 0.2 to 2 .mu.m;
- and
- (d) a carbon content of 0.1% to 3% by weight;
- with all percents by weight based upon the total particle composition weight, in a vehicle containing paste.
Dependencies are inferred from the claim text.