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Title: Apparatus and process 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 figures.
Inventors:
;
Issue Date:
OSTI Identifier:
6666854
Assignee:
General Electric Company, Erie, PA (United States) PTO; EDB-95-029086
Patent Number(s):
US 5373993; A
Application Number:
PPN: US 7-965659
Contract Number:
AC21-88MC23174
Resource Relation:
Patent File Date: 6 Aug 1992
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 01 COAL, LIGNITE, AND PEAT; DIESEL ENGINES; FUEL INJECTION SYSTEMS; NOZZLES; FUEL SLURRIES; COMBUSTION; PROTECTIVE COATINGS; VAPOR DEPOSITED COATINGS; COAL; EROSION; MITIGATION; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; COATINGS; DISPERSIONS; ENERGY SOURCES; ENGINES; FOSSIL FUELS; FUEL SYSTEMS; FUELS; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; MATERIALS; MIXTURES; OXIDATION; SLURRIES; SUSPENSIONS; THERMOCHEMICAL PROCESSES 330102* -- Internal Combustion Engines-- Diesel; 014000 -- Coal, Lignite, & Peat-- Combustion