Gas injection disc assembly for CVD applications
US5846330A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1997 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Jun 26, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C16/513
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A gas injection disc is provided which includes an outer ring and a tubular modular insert which slips into the outer ring. The outer ring is provided with an inner bore, a ring-shaped plenum located around the inner bore, an outer gas sealing surface around the plenum, and two gas feed paths extending from the periphery of the outer ring to the plenum. The gas feed paths are each provided with a gas feed attachment for coupling gas supply tubes thereto. The insert is provided with a plurality of radially aligned injectant holes, an inner gas sealing surface, and an axial bore. The insert is seated in the inner bore of the outer ring such that the inner and outer gas sealing surface face each other with a small gap provided therebetween which enables the insertion of the insert into the inner bore. The insert thereby substantially encloses the plenum, and the injectant holes are aligned with the plenum to receive injectant gases and direct the injectant gases into the axial bore of the insert. During the CVD process, the heat generated by the arc jet causes the insert to expand and eliminate the gap between the inner and outer sealing surfaces to thereby prevent undesirable gas lea…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.