Accession Number : ADA133732

Title :   Aircraft Water-Based Solid Film Lubricants.

Descriptive Note : Final rept.,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE

Personal Author(s) : Conte,Alfeo A , Jr

PDF Url : ADA133732

Report Date : 10 Jun 1983

Pagination or Media Count : 28

Abstract : An improved MIL-L-81329 water based extreme temperature range solid film lubricant has been developed. This material provides corrosion protection and improved endurance life for steel on steel components while maintaining the other desirable properties such as oxidation resistance. An upgraded specification covering the properties of this material, which is designated 23C, is provided in appendix A. The goals of this program were twofold; 1) to develop a high temperature water resistant solid film lubricant based on lithium silicate; and 2) to develop a water based non-polluting solid film lubricant to replace MIL-L-8937 for moderate temperature applications. It was found that although lithium silicate films are resistant to solvation by water they are more permeable than sodium silicate films and thus allow corrosion of steel substrates to proceed at a faster rate. The addition inorganic nitrites as corrosion inhibitors causes an instability of the lithium silicate, with SiO2 precipitating immediately. For the moderate temperature range application of MIL-L-8937, solid film lubricants containing water soluble resins were studied. The best material studies showed an endurance life of only one half that of MIL-L-8937. The use of an experimental strategy technique was found very beneficial in determining optimum composition ranges with a minimal amount of experimentation. (Author)

Descriptors :   *Solid film lubricants, *Aircraft equipment, High temperature, Corrosion resistance, Endurance(General), Life expectancy(Service life), Steel, Parts, Oxidation resistance, Water, Resistance, Molybdenum, Sulfides, Lithium compounds, Silicates, Sodium compounds, Graphite, Potassium compounds, Nitrites, Corrosion inhibition

Subject Categories : Terminal Flight Facilities
      Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE