Glass-based and glass-ceramic-based composites
AssigneeMinnesota Mining and Manufacturing Company
InventorKyung H. Moh
Life of this patent
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Abstract
This invention provides a composite article comprising mullite bubbles dispersed in one of a glass matrix and a glass-ceramic matrix, and a method of making the same. The composite ceramic article of the present invention is useful in applications requiring a material having a low dielectric constant, low dissipation factor, thermal expansion properties compatible with silicon, and good mechanical strength. The composite ceramic article of the present invention is particularly useful as a substrate for thick film circuits, housings for integrated circuit assemblies (i.e., covers), and materials such as gyrotron windows, that require transparency to microwaves or millimeter waves, in addition to acceptable power transmission efficiencies.
Claims38
A composite ceramic article comprising a plurality of crystalline mullite bubbles dispersed in a matrix selected from the group consisting of a borosilicate-based glass matrix and an aluminosilicate-based glass-ceramic matrix.
A green composite article comprising a plurality of crystalline mullite bubbles dispersed in a matrix selected from the group consisting of a borosilicate-based glass powder matrix, an aluminosilicate-based glass powder matrix, an aluminosilicate-based glass-ceramic powder matrix, and an aluminosilicate-based glass powder and aluminosilicate-based glass-ceramic powder matrix.
A method for making a composite article, said method comprising the steps of:
- (a) shaping a slurry comprising a liquid media, a plasticizer, a binder, a plurality of crystalline mullite bubbles, and a matrix selected from the group consisting of borosilicate-based glass powder, an aluminosilicate-based glass powder, an aluminosilicate-based glass-ceramic powder, and an aluminosilicate-based glass powder and aluminosilicate-based glass-ceramic powder;
- (b) drying said shaped slurry,
- to provide a green composite article comprising a plurality of mullite bubbles dispersed in a matrix selected from the group consisting of a borosilicate-based glass powder matrix, an aluminosilicate-based glass powder matrix, an aluminosilicate-based glass-ceramic powder matrix, and an aluminosilicate-based glass powder and aluminosilicate-based glass-ceramic powder matrix.
Dependencies are inferred from the claim text.