VIBRATION DAMPING COATINGS

• US 3,758,233 A
• Filed: 01/17/1972
• Issued: 09/11/1973
• Est. Priority Date: 01/17/1972
• Status: Expired due to Term

• Current Assignee: John R. Cavanagh, Kenneth R. Cross, Richard L. Newman
• Original Assignee: John R. Cavanagh, Kenneth R. Cross, Richard L. Newman
• Inventors: Cross, Kenneth R., Cavanagh, John R., Newman, Richard L.
• Primary Examiner(s): Powell, Jr., Everette A.
• Application Number:
  US05/218,219
• Time in Patent Office: 603 Days
• Field of Search: 416/241,500,229
• US Class Current: 416/229.00R
• CPC Class Codes: C23C 4/02 Pretreatment of the material to be coated, e.g. for coating on selected surface areas
• CPC Class Codes: C23C 4/11 Oxides
• CPC Class Codes: F01D 5/284 Selection of ceramic materials
• CPC Class Codes: Y10S 416/50 Vibration damping features

Abstract

Nickel, cobalt, aluminum, iron-nickel, molybdenum, and titanium alloy articles are provided with a plasma sprayed coating for increasing the vibration damping capacity thereof. The coating consists of a outermost layer portion formed of an oxide ceramic or refractory carbide and an intermediate portion formed of a mixture of one of the above alloys and the material forming the outermost layer. In the preferred embodiment, the intermediate portion consists of two or more discrete layers, with the layers having decreasing alloy content and increasing oxide ceramic content toward the outermost layer portion.

Claims

2. An article of manufacture comprising a substrate formed of a metal taken from the group consisting of nickel, cobalt, aluminum, iron-nickel, molybdenum, and titanium based alloys;

and a sprayed coating thereover, said coating consisting of a discrete outermost layer portion consisting esseNtially of an oxide ceramic material taken from the group consisting of magnesium aluminate and zirconium dioxide, and an intermediate portion between said outermost portion and said substrate consisting of a plurality of discrete intermediate layers, each of said intermediate layers consisting essentially of a mixture of about 65 to 35 percent of the metal forming said substrate and the balance being of the material composing said outermost layer portion, the proportion of said oxide ceramic material in each of said intermediate layers increasing from said substrate to said outermost layer portion.

3. An article of manufacture comprising a core formed of aluminum, a sprayed substrate bonded to said core formed of molybdenum, and a sprayed coating over said substrate, said coating consisting of a discrete outermost layer portion consisting essentially of magnesium aluminate, and an intermediate portion between said outermost layer portion and said substrate consisting of a first discrete intermediate layer immediately beneath said outermost layer consisting essentially of about 65 percent magnesium aluminate and 35 percent molybdenum, and a second discrete intermediate layer between said first intermediate layer and said substrate consisting essentially of about 35 percent magnesium aluminate and 65 percent molybdenum, said substrate, outermost layer, and first and second intermediate layers being at least about 0.002 inch in thickness.

4. Claim 3 wherein said article is a compressor blade for use in a gas turbine engine.

5. An article of manufacture comprising a core formed of a nickel based superalloy, a sprayed nickel base superalloy substrate bonded to said core, and a spray coating over said substrate, said coating consisting of a discrete outer layer portion consisting essentially of zirconium dioxide, and an intermediate layer portion between said outermost layer portion and said substrate consisting essentially of about equal portions of a nickel base superalloy and zirconium dioxide, said substrate, outermost layer and intermediate layer each being at least about 0.002 inch in thickness.