Dry lubricated materials

Claim 2

A MEMBER FOR USE UNDER DRY LUBRICATED CONDITIONS COMPRISING; A SUBSTRATE HAVING A WORKING SURFACE THEREON COMPRISED INITIALLY OF AN IRON OXIDE MATRIX CONTAINING AN INTERSPERSED MIXTURE OF A TRAPPING MATERIAL MEANS FOR EMBEDDING ABRADED PARTICLES AND DEBRIS PARTICULARLY IRON OXIDE PARTICLES IN THE WORK SURFACE DURING USE SELECTED FROM THE GROUP CONSISTING OF BARIUM SULFATE, CADMIUM SULFATE, CALCIUM OXIDE CALCIUM PHOSPHATE, SODIUM SULFATE, SODIUM SULFIDE, SODIUM BIDIUM PHOSPHATE, SODIUM SUCALCIUM SULFATE, SODIUM SULFIDE, SODIUM BIPHOSPHATE, ZINC SULFIDE, ZINC OXIDE, TITANIUM OXIDE, CALCIUM FLUORIDE, SODIUM BORATE, AND MIXTURES THEREOF AND A COMPONENT SELECTED FROM THE GROUP CONSISTING OF NICKEL COATED GRAPHITE, GRAPHITE AND MIXTURES THEREOF.

Claim 3

The member of claim 1 wherein the interspersed mixture is trapping material and graphite, present in about a proportion of 1:1 by weight.

Claim 4

The member of claim 1 wherein the trapping material is selected from the group consisting of Na2SO4, Na2S, NaHPO4, Na3PO4, NaBO2 and mixtures thereof.

Claim 5

The member of claim 1 wherein the substrate is a stainless steel.

Claim 6

The member according to claim 1 wherein the initial working surface comprises a matrix consisting substantially of Fe3O4 and the interspersed mixture is nickel coated graphite and a trapping material selected from the group consisting of Na2SO4, Na2S, NaHPO4, NaBO2 and mixtures thereof.

Claim 7

The member according to claim 5 wherein the proportions of the various components of the working surface are about 50% by weight Fe3O4, 30% by weight nickel coated graphite and 20% by weight trapping material.

Claim 8

A REGENERATOR SECTION FOR A GAS TURBINE ENGINE COMPRISING AT LEAST TWO MEMBERS ARRANGED FOR RUBBING CONTACT DURING OPERATION OF THE ENGINE ONE OF THE MENBERS HAVING AN INITIIAL WORKING SURFACE COMPRISED OF AN IRON OXIDE MATRIX CONTAINING AN INTERSPERSED MIXTURE OF NICKEL COATED GRAPHITE OR GRAPHITE AND A PARTICLE-DEBRIIS TRAPPING MATERIAL SELECTED FROM THE GROUP CONSISTING OF BARIUM SULPHATE, CADMIUM SULPHATE, CALCIUM OXIDE, CALCIUM PHOSPHATE, CALCIUM SULPHATE, MANGANESE SULPHATE, SODIUM PHOSPHATE, SODIUM SULFATE, SODIUM SULFIDE SODIUM BIPHOSPHATE, ZINC SULFIDE, ZINC OXIDE, TITANIUM OXIDE CALCIUM FLUORIDE, SODIUM BORATE, AND IN MIXTURES THEREOF, AND WHEREIN A TRANSFORMATION OCCURS IN THE WORK SURFACE DURING A BREAK-IN ERIOD, FORMING AS A RESULT, SUBSTANTIALLY CONTINOUS HIGHLY ORIENTED FILM OF FE2O3 ON THE WORK SURFACE OF THE ONE MEMBER AND A FILM OF FE2O3 IS ALSO FORMED ON THE MATING SECOND MEMBER BY TRANSFER FROM THE ONE MEMBER TO THE SECOND MEMBER.

Claim 9

A REGENERATOR SECTION FOR A GAS TURBINE ENGINE COMPRISING AT LEAST TWO MEMBERS ARRANGED FOR RUBBING CONTACT DURING OPERATION OF THE ENGINE ONE OF THE MENBERS HAVING AN INITIIAL WORKING SURFACE COMPRISED OF AN IRON OXIDE MATRIX CONTAINING AN INTERSPERSED MIXTURE OF NICKEL COATED GRAPHITE OR GRAPHITE AND A PARTICLE-DEBRIIS TRAPPING MATERIAL SELECTED FROM THE GROUP CONSISTING OF BARIUM SULPHATE, CADMIUM SULPHATE, CALCIUM OXIDE, CALCIUM PHOSPHATE, CALCIUM SULPHATE, MANGANESE SULPHATE, SODIUM PHOSPHATE, SODIUM SULFATE, SODIUM SULFIDE SODIUM BIPHOSPHATE, ZINC SULFIDE, ZINC OXIDE, TITANIUM OXIDE CALCIUM FLUORIDE, SODIUM BORATE, AND IN MIXTURES THEREOF, AND WHEREIN A TRANSFORMATION OCCURS IN THE WORK SURFACE DURING A BREAK-IN ERIOD, FORMING AS A RESULT, SUBSTANTIALLY CONTINOUS HIGHLY ORIENTED FILM OF FE2O3 ON THE WORK SURFACE OF THE ONE MEMBER AND A FILM OF FE2O3 IS ALSO FORMED ON THE MATING SECOND MEMBER BY TRANSFER FROM THE ONE MEMBER TO THE SECOND MEMBER.

Claim 10

The article of claim 7 wherein the one member is selected from the group consisting of regenerator seal rims and cross-arms, the mating surface being provided by the regenerator core.

Claim 11

The article according to claim 7 wherein the initial working surface is comprised of an Fe3O4 matrix.

Claim 12

The member according to claim 1 wherein the graphite used is nickel coated graphite.