DETAILED DESCRIPTION We claim: 1.
A method for chemically bonding a body of a refractory oxide ceramic selected from the group consisting of oxides of metals of groups II, III, IV and VIII of the Periodic Classification of the Elements and mixtures of such oxides, in chemical combination and physical admixture to the body of a metal selected from the group consisting of metals having atomic numbers between 21 and 29 inclusive in the first transition series between 39 and 47 inclusive in the second transition series and between 57 and 79 inclusive in the third transition series; the method comprising disposing selected surfaces of the bodies to be bonded in abutting relationship and heating at least the abutting surfaces in an atmosphere consisting of air to a temperature below the melting point of the lowest melting component of the system, the temperature sufficient to bring about a chemical reaction between the ceramic oxide and the metal thereby forming a bond between the said surfaces.
2.
A method as claimed in claim 1, wherein heating of the surfaces is carried out in air at normal or reduced pressure.
3.
A method as claimed in claim 1, wherein the oxide is selected from the group consisting of BeO, MgO, CaO, BaO, Al.
sub.
2 O.
sub.
3, Sc.
sub.
2 O.
sub.
3 the rare earth and actinide oxides, SiO.
sub.
2, ZrO.
sub.
2, TiO.
sub.
2 and the oxides of iron, cobalt, nickel and ruthenium.
4.
A method as claimed in claim 1, wherein the metal is selected from the group consisting of Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt, Cu, Ag, and Au.
5.
A method as claimed in claim 4, wherein the said oxide is in chemical combination or physical admixture with other oxides.
6.
A method as claimed in claim 4, wherein the metal is Pd, Pt or Au and the bond formed is characterized by a sharp discontinuity at the metal-ceramic interface and the depth of diffusion of the metal into the ceramic material is less than about 250 A.
7.
A method as claimed in claim 4, wherein the metal is Fe, Co or Ni and the bond formed is characterized by a sharp discontinuity at the metal-ceramic interface and diffusion of the metal into the ceramic material, the metal being detectable in the ceramic body up to about 40
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