Apparatus for depositing hard coating in a nozzle orifice
The present invention is directed to a process for coating the interior surfaces of an orifice in a substrate that forms a slurry fuel injection nozzle. In a specific embodiment, the nozzle is part of a fuel injection system for metering a coal-water slurry into a large, medium-speed, multi-cylinder diesel engine. In order to retard erosion of the orifice, the substrate is placed in a chemical vapor deposition (CVD) reaction chamber. A reaction gas is passed into the chamber at a gas temperature below its reaction temperature and is directed through the orifice in the substrate. The gas reaction temperature is a temperature at and above which the reaction gas deposits as a coating, and the reaction gas is of a composition whereby improved resistance to erosion by flow of the particulates in the slurry fuel is imparted by the deposited coating. Only the portion of the substrate in proximity to the orifice to be coated is selectively heated to at least the gas reaction temperature for effecting coating of the orifice`s interior surfaces by the vapor deposited coating formed from the reaction gas. 2 figs.
- Research Organization:
- General Electric Co., Boston, MA (United States)
- DOE Contract Number:
- AC21-88MC23174
- Assignee:
- General Electric Co., Erie, PA (United States)
- Patent Number(s):
- US 5,391,233/A/
- Application Number:
- PAN: 8-251,223
- OSTI ID:
- 27708
- Resource Relation:
- Other Information: PBD: 21 Feb 1995
- Country of Publication:
- United States
- Language:
- English
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Apparatus and process for depositing hard coating in a nozzle orifice
Apparatus and process for depositing hard coating in a nozzle orifice