US 5,160,765 A · Process for the metallization of ceramics and apparatus for carrying out the process

Abstract

Metallization of ceramics of the type comprising depositing a metallic paste based on molybdenum and/or tungsten and manganese on a ceramic substrate and effecting the sintering of the paste in an atmosphere having a predetermiend oxido-reduction potential, with a rise in and a maintenance of a temperature between 1300.degree. C. and 1600.degree. C., then cooling to ambient temperature, with production of an atmosphere by the addition to a pure neutral gas of a quantity of additional oxygen and a quantity of hydrogen at least sufficient to subsequently obtain by catalytic reaction the desired content of water vapour and contingently the excess content of hydrogen.

Claims14

Dependent claims

A process for metallizing ceramic articles which comprises the steps of:

a) depositing on a ceramic substrate a coating of a metallizing paste;
b) placing the coated substrate in an oven;
c) producing a treatment atmosphere comprising nitrogen, hydrogen and water vapor and which is substantially free of oxygen by
(i) providing a first mixture of nitrogen and hydrogen;
(ii) introducing oxygen into said first mixture for obtaining a second mixture;
and
(iii) passing the second mixture through a catalytic reactor to cause the oxygen in the second mixture to catalytically react with the hydrogen,
said treatment atmosphere having a ratio of hydrogen content to water content of between 5:1 and 36:1;
d) supplying the oven with said treatment atmosphere;
and
e) raising the temperature in the oven from the room temperature to a temperate between 1300.degree. C. and 1600.degree. C.

8 more elements

Dependencies are inferred from the claim text.

Process for the metallization of ceramics and apparatus for carrying out the process

Life of this patent

Process for the metallization of ceramics and apparatus for carrying out the process

Life of this patent

Abstract

Claims14