High temperature seal

Claim 2

A RUBBING CONTACT FLUID SEALING MEMBER COMPRISING A BASE MEMBER AND A POROUS LAYER FORMED OF A METAL HAVING TEMPERATURE RESISTANCE AND OXIDATION AND SULFIDATION RESISTANCE AT TEMPERATURES IN EXCESS OF 1,200*F ADAPTED FOR RUBBING CONTACT BONDED TO AT LAST A PORTION OF SAID BASE MEMBER WITH A SEAL MATERIAL FILLING THE PORES OF SAID LAYER AND BONDED THEREIN, SAID LAYER HAVING A PORE DENSITY IN THE RANGE OF ABOUT 10 TO 100 PORES/INCH, AND SAID SEAL MATERIAL CONSISTING ESSENTIALLY OF A POTASSIUM SILICATE-BOUND MIXTURE OF COPPER CHROMITE AND CHROMIC OXIDE IN WHICH THE MIXTURE CONTAINS ABOUT 47 TO ABOUT 88 PERCENT COPPER CHROMITE AND COMPRISES ABOUT 88 TO 92 PERCENT BY WEIGHT OF THE SEAL MATERIAL.

Claim 3

A rubbing contact fluid sealing member comprising a base member, a porous, reticulate nickel foam layer having a pore density of about 30 to 60 pores/inch bonded to at least a portion of said base member and adapted for rubbing contact and a seal material filling the pores of said layer, said seal member consisting essentially of a potassium silicate-bound mixture of copper-chromite and chromic oxide in which the mixture contains about 47 to about 88 percent copper chromite and comprises about 88 to 92 percent by weight of the seal material.

Claim 4

A rubbing contact fluid sealing member comprising a base member, a porous, reticulate nickel foam layer having a pore density of about 30 to 60 pores/inch bonded to at least a portion of said base member and adapted for rubbing contact and a seal material filling the pores of said layer, said seal member consisting essentially of a potassium silicate-bound mixture of copper-chromite and chromic oxide in which the mixture contains about 47 to about 88 percent copper chromite and comprises about 88 to 92 percent by weight of the seal material.

Claim 5

A fluid seal for use in the rotary regenerator portion of a gas turbine engine, said portion including a housing adapted to enclose a rotating regenerator matrix, said seal comprising, in combination, a stationary metal base and a reticulate layer formed of a metal having temperature resistance and oxidation and sulfidation resistance at temperatures in excess of 1,200*F characterized by fibrils forming a three-dimensional skeletal network with interconnected pores therebetween bonded to at least a portion of said base, and means for retaining said base member between said housing and said matrix with said layer being adapted for rubbing contact with said rotating regenerator matrix, said layer having a pore density in the range of about 30 to 60 pores/inch, the pores of said layer being filled with a seal material bonded therein, said seal material consisting essentially of a potassium silicate-bound mixture of copper chromite and chromic oxide in which the mixture contains about 47 to about 88 percent copper chromite and comprises about 88 to 92 percent by weight of the seal material.

Claim 6

A fluid seal for use in the rotary regenerator portion of a gas turbine engine, said portion including a housing adapted to enclose a rotating regenerator matrix, said seal comprising, in combination, a stationary metal base and a reticulate layer formed of a metal having temperature resistance and oxidation and sulfidation resistance at temperatures in excess of 1,200*F characterized by fibrils forming a three-dimensional skeletal network with interconnected pores therebetween bonded to at least a portion of said base, and means for retaining said base member between said housing and said matrix with said layer being adapted for rubbing contact with said rotating regenerator matrix, said layer having a pore density in the range of about 30 to 60 pores/inch, the pores of said layer being filled with a seal material bonded therein, said seal material consisting essentially of a potassium silicate-bound mixture of copper chromite and chromic oxide in which the mixture contains about 47 to about 88 percent copper chromite and comprises about 88 to 92 percent by weight of the seal material.