Process for making hollow, ceramic spheroids
US4769189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Dec 12, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L1/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for making hollow, ceramic macrospheres by making a paste of a continuous phase material (e.g., sodium silicate or potassium silicate) and an insolubilizing agent (e.g., kaolin clay). Pellets are formed from the paste and expanded by subjection to heat to form hollow spheroids. The spheroids are fired at a temperature (typically 600.degree.-1000.degree. C.) and for a time sufficient to insolubilize the continuous phase material. The process may further include coating the fired spheroids with an epoxy resin (to reduce porosity) and/or bonding a plurality of the fired spheroids together to form a rigid mass of bonded spheroids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.