Accession Number : ADA330677

Title :   Thin Dense Chrome Bearing Insertion Program.

Descriptive Note : Final rept. 1 Mar 92-1 dec 96,

Corporate Author : GE AIRCRAFT ENGINES CINCINNATI OH ADVANCED ENGINEERING PROGRAMS DEPT

Personal Author(s) : Rhoads, Mark ; Shucktis, Bernie ; Johnson, Michael

PDF Url : ADA330677

Report Date : MAR 1997

Pagination or Media Count : 162

Abstract : This report includes the results of program efforts to develop and introduce a nodular Thin Dense Chrome (TDC) plating process for aircraft engine mainshaft bearings. program objectives included development of a Thin Dense Chrome material/process specification and completing a thorough evaluation of all potential risks associated with introducing TDC coated Bearings into field engine applications. A comprehensive series of subscale and full scale tests were completed to evaluate the capabilities of TDC coated bearings at various inservice operating conditions. TDC coated bearings demonstrated improved corrosion and contamination resistance. TDC coated bearings also demonstrated acceptable performance during thermal cycle, oil-off, and induced defect conditions. However, the TDC coating performance did not meet the required objectives in the areas of rolling contact fatigue life, skid damage resistance, engine assembly damage tolerance, and engine operational endurance. Based on the results of this program, it was concluded that TDC coated bearings provided too great of a risk for insertion into the mainshaft bearing positions of military aircraft engines.

Descriptors :   *TURBOFAN ENGINES, *METAL COATINGS, *CORROSION RESISTANCE, *BEARINGS, MILITARY AIRCRAFT, DAMAGE, FATIGUE LIFE, AIRCRAFT ENGINES, PERFORMANCE(ENGINEERING), MILITARY EQUIPMENT, TEST METHODS, SHAFTS(MACHINE ELEMENTS), CHROMIUM, CONTAMINATION, SKIDDING.

Subject Categories : Military Aircraft Operations
      Machinery and Tools
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE