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Title: 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.
Inventors:
 [1];  [2]
  1. (Fairview, PA)
  2. (Erie, PA)
Issue Date:
OSTI Identifier:
869753
Assignee:
General Electric Company (Erie, PA) NETL
Patent Number(s):
US 5391233
Contract Number:
AC21-88MC23174
Research Org:
GENERAL ELECTRIC CO
Country of Publication:
United States
Language:
English
Subject:
apparatus; depositing; hard; coating; nozzle; orifice; directed; process; interior; surfaces; substrate; forms; slurry; fuel; injection; specific; embodiment; metering; coal-water; medium-speed; multi-cylinder; diesel; engine; retard; erosion; placed; chemical; vapor; deposition; cvd; reaction; chamber; gas; passed; temperature; below; deposits; composition; whereby; improved; resistance; flow; particulates; imparted; deposited; portion; proximity; coated; selectively; heated; effecting; formed; deposited coating; gas temperature; coating formed; water slurry; coal-water slurry; reaction gas; diesel engine; vapor deposited; temperature below; chemical vapor; reaction chamber; vapor deposition; interior surface; reaction temperature; fuel injection; interior surfaces; slurry fuel; specific embodiment; gas reaction; improved resistance; selectively heated; retard erosion; whereby improved; multi-cylinder diesel; nozzle orifice; injection nozzle; hard coating; composition whereby; gas deposits; effecting coating; depositing hard; /118/

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