Abstract A seal member designed to rub against a rotating ceramic regenerator is made by applying a surface layer consisting essentially of a glazing material such as a fluoride of lithium, sodium, potassium or calcium and a matrix material such as zinc oxide to a metal substrate. A bonding layer of nickel-aluminide can be applied to the substrate and an intermediate layer of nickel oxide and calcium fluoride can be included between the nickel-aluminide layer and the surface layer. The glazing material forms a low friction glaze at a temperature depending primarily on the composition thereof with lithium fluoride compositions producing useful glazes between about 450*-900* F., calcium fluoride compositions producing useful glazes at about 700*-1,800* F., and sodium and potassium compositions producing useful glazes in intermediate temperature ranges.
The seal member of claim 1 in which the glaze producing material consists essentially of lithium fluoride.
Claim 2
Dependent Claim
16 words
The seal member of claim 2 in which the matrix material consists essentially of zinc oxide.
Claim 3
Dependent Claim
23 words
The seal member of claim 3 in which the surface layer contains about 10-40 weight percent glazing material and the balance matrix material.
Claim 4
Dependent Claim
23 words
The seal member of claim 1 in which the surface layer contains about 10-40 weight percent glazing material and the balance matrix material.
Claim 5
Dependent Claim
77 words
A seal member having a low coefficient of friction and low wear when rubbing against a ceramic material at temperatures above 700*F. comprising a metal substrate having a surface layer attached to one surface, said surface layer consisting essentially of a glaze producing material containing calcium fluoride and a non-abrading matrix material selected from the group consisting of zinc oxide, cuprous oxide, barium zirconate, strontium zirconate, and barium titanate, said surface layer being free of calcium oxide.
Claim 6
Dependent Claim
14 words
The seaL member of claim 6 in which the matrix material is zinc oxide.
Claim 7
Dependent Claim
25 words
The seal member of claim 6 in which the surface layer contains about 10-40 weight percent of glaze producing material with the balance matrix material.