Coating for compressor outlet housing

A compressor for use in an aircraft comprising:

• a compressor impeller and a compressor inlet connected to supply air to said compressor impeller, said compressor inlet to be connected to a source of RAM air on an aircraft;
• an electric motor for driving said compressor impeller, and a shaft driven by said electric motor to rotate said compressor impeller, said compressor impeller including seal teeth;
• a compressor outlet housing with a housing body having a volute and a radially inwardly extending wall extending from a radially inner surface of said volute, and said radially inwardly extending wall extending inwardly to a ledge, a radially inwardly extending web extending to a bearing support, and a fillet facing said compressor impeller, said fillet connecting said ledge to said web, and an erosion resistant coating being formed at least on said fillet;
• and
• wherein a first radial distance is defined between a radially innermost surface of said ledge to a radially outermost surface of said bearing support, and measured perpendicular to a central axis of said bearing support and a second radial distance is defined from a radially innermost end of said coaling to said radially outermost surface of said bearing support also measured perpendicular to said central axis of said bearing support and a ratio of said first radial distance to said second radial distance is between 1.1 and 2.0.

A method of repairing a compressor for use in an aircraft comprising the steps:

• 1) removing an existing compressor outlet housing from a compressor having a compressor impeller and a compressor inlet connected to supply air to said compressor impeller, said compressor inlet to be connected to a source of RAM air on an aircraft, an electric motor for driving said compressor impeller, and a shaft driven by said electric motor to rotate said compressor impeller, said compressor impeller including seal teeth;
• and
• 2) replacing the existing compressor outlet housing with a replacement compressor outlet housing, the replacement compressor outlet housing having a housing body with a volute and a radially inwardly extending wall extending from a radially inner surface of said volute, and said radially inwardly extending wall extending inwardly to a ledge, a radially inwardly extending web extending to a bearing support, and a fillet facing said compressor impeller, said fillet connecting said ledge to said web, and an erosion resistant coating being formed on said fillet;
• and
• wherein a first radial distance is defined between a radially innermost surface of said ledge to a radially outermost surface of said bearing support, and measured perpendicular to a central axis of said bearing support and a second radial distance is defined from a radially innermost end of said coating to said radially outermost surface of said bearing support also measured perpendicular to said central axis of said bearing support and a ratio of said first radial distance to said second radial distance is between 1.1 and 2.0.