Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1990-02-22
1992-01-21
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264 60, 264 61, 264 65, C04B 3332
Patent
active
050826069
ABSTRACT:
The invention concerns the production of ceramic-metal multilayer components comrising effecting, after making up in the crude state, in particular by metallization and stacking of pre-cut raw ceramic bands, a simultaneous firing operation, termed cofiring, on the components under an atmosphere based on hydrogen or nitrogen or a mixture of hydrogen and nitrogen, having a regulated water vapor content at a temperature of first of all between 800.degree. C. and 1800.degree. C., and more precisely either at a moderately high temperature plateau between 800.degree. C. and 1300.degree. C. for certain ceramic materials such as codierite and metallic materials such as copper and nickel, or at a temperature plateau between about 1400.degree. C. and 1800.degree. C. for refractory materials such as tungsten, molybdenum, alumina, according to which the atmosphere having a water vapor content is obtained by addition to a vector gas at (13) and (14) of a quantity of additional oxygen (15), and a quantity of additional hydrogen at (14) sufficient to obtain by hydrogen-oxidation reaction the predetermined water vapor content, and determining these quantities of addition of oxygen and the contingent addition of hydrogen so that said water vapor content is, in the course of the cofiring, that which is the most appropriate for the different stages of said cofiring.
REFERENCES:
patent: 4678683 (1987-07-01), Pasco et al.
Solid-State Technology, vol. 29, No. 9, Sep. 1986, pp. 135-138, Port Washington, N.Y., U.S.; E. A. Hayduk, Jr. et al; "Furnace Atmosphere's Effect on Cofiring Tungsten-Alumina Multilayer Substrates".
Memories Scientifiques de la Revue de Metallurgie, vol. LXIV, Nos. 7/8, 1967, pp. 653-661; L. Guillet et al, "Reduction D'Oxide de fer par L'Hydrogene Pur".
Olivier Michel
Queille Philippe
Rancon Yannick
Rotman Frederic
Derrington James
L'Air Liquide, Societe Anonyme pour L'Etude et L'Exploitation de
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