CERMET SEALING MATERIALS FOR GAS TURBINES,
Abstract
The aviation industry uses various types of nickel-graphite sintered materials (S-5, S-118T, S-120m, S-137 and others) as sealing inserts in turboprop or turbojet engines which have a hardness of 34-35 HB, a bend strength of 7 kg/sq mm and can be operated safely at up to 650C. To provide sealing inserts for temperatures up to 850C, the new KN, UM-64-7, UM-61-7, UMB-2s nickel-base sintered materials were tested. These materials substitute a solid lubricant which is chemically inert at high temperature for graphite. The materials have better working properties than nickel-graphite materials. The UMB-4s nichrome-base material is obtained by simultaneous reduction of oxides. It contains boron nitride as a solid lubricant. Inserts made of this material were treated on numerous engines and, after prolonged operation, none were defective. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 24, 1968
- Accession Number
- AD0682831
Entities
People
- M. K. Belitskii
Organizations
- National Air and Space Intelligence Center