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US 6,381,829 B2Granted
Method for making an improved main shaft for a coal pulverizer by employing a ceramic coating thereon
AssigneeThe Babcock & Wilcox Company
InventorsRobert R. Piepho, David W. Gerber
Life of this patent
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Abstract
An improved main shaft for a coal pulverizer having a selected portion of the main shaft provided with an intervening material such as a thermally sprayed ceramic coating.
Claims15
A method for making an improved main shaft for a coal pulverizer, comprising the steps of:
- shot peening a selected portion of the main shaft;
- and
- thermally spraying a ceramic coating on the selected portion of the main shaft.
A method of making an improved main shaft for a coal pulverizer, comprising the steps of:
- a. shot peening a selected portion of the main shaft;
- b. thermally spraying a ceramic coating on a selected portion of the main shaft;
- c. finish grinding the ceramic coating;
- d. tempering a bushing to a selected hardness;
- e. applying a dry film lubricant to the inside of the bushing;
- and
- f. positioning the bushing on the yoke end of the main shaft.
4 more elements
A method of making an improved main shaft for a coal pulverizer, comprising the steps of:
- a. applying a surface treatment to a selected portion of the main shaft to leave the near surface layer of the selected portion in a state of residual compressive stress;
- b. applying a ceramic coating on the selected portion of the main shaft;
- and
- c. finish grinding the ceramic coating.
1 more element
Dependencies are inferred from the claim text.