Apparatus for depositing hard coating in a nozzle orifice

Patent · Sat Dec 31 23:00:00 EST 1994

OSTI ID:869753

Flynn, Paul L ^[1]; Giammarise, Anthony W ^[2]

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1. Fairview, PA
2. Erie, PA

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.

• Research Organization: GENERAL ELECTRIC CO
• DOE Contract Number: AC21-88MC23174
• Assignee: General Electric Company (Erie, PA)
• Patent Number(s): US 5391233
• OSTI ID: 869753
• Country of Publication: United States
• Language: English

Related Subjects

/118/
apparatus
below
chamber
chemical
chemical vapor
coal-water
coal-water slurry
coated
coating
coating formed
composition
composition whereby
cvd
deposited
deposited coating
depositing
depositing hard
deposition
deposits
diesel
diesel engine
directed
effecting
effecting coating
embodiment
engine
erosion
flow
formed
forms
fuel
fuel injection
gas
gas deposits
gas reaction
gas temperature
hard
hard coating
heated
imparted
improved
improved resistance
injection
injection nozzle
interior
interior surface
interior surfaces
medium-speed
metering
multi-cylinder
multi-cylinder diesel
nozzle
nozzle orifice
orifice
particulates
passed
placed
portion
process
proximity
reaction
reaction chamber
reaction gas
reaction temperature
resistance
retard
retard erosion
selectively
selectively heated
slurry
slurry fuel
specific
specific embodiment
substrate
surfaces
temperature
temperature below
vapor
vapor deposited
vapor deposition
water slurry
whereby
whereby improved