Method for producing sintered metalized aluminum nitride ceramic bodies
First Claim
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1. A method for producing a sintered metalized aluminum nitride ceramic body, comprising the steps of:
- applying, onto a green aluminum nitride ceramic body, a metalizing paste comprised of about 50 to 90% of an inorganic component which comprises 90 to 99% by weight of powdered metalizing agent selected from the group consisting of tungsten, molybdenum, hafnium nitride, zirconium nitride and titanium nitride and 1 to 10% by weight of a powdered mixture comprising 5 to 95% by weight of aluminum nitride and 5 to 50% by weight of a rare earth metal oxide which is dispersed in an amount of about 10 to about 50% of anorganic vehicle to form the metalizing paste;
thereafterdrying the metalizing paste; and
thereaftersintering the metalizing paste and the green ceramic body by heating to a temperature of from about 1750°
C. to about 2000°
C. in a nitrogen or nitrogen-hydrogen mixture atmosphere to convert the metalizing paste and the green ceramic body into said sintered metalized aluminum nitride body.
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Abstract
To permit using a single firing step, sintered aluminum nitride ceramic bodies provided with firmly adhering electrically conductive films or resistive layers can be produced by sintering of the green ceramic bodies and the films or layers in common, if these films or layers additionally contain a mixture of aluminum nitride and rare earth metal oxide.
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Citations
22 Claims
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1. A method for producing a sintered metalized aluminum nitride ceramic body, comprising the steps of:
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applying, onto a green aluminum nitride ceramic body, a metalizing paste comprised of about 50 to 90% of an inorganic component which comprises 90 to 99% by weight of powdered metalizing agent selected from the group consisting of tungsten, molybdenum, hafnium nitride, zirconium nitride and titanium nitride and 1 to 10% by weight of a powdered mixture comprising 5 to 95% by weight of aluminum nitride and 5 to 50% by weight of a rare earth metal oxide which is dispersed in an amount of about 10 to about 50% of anorganic vehicle to form the metalizing paste;
thereafterdrying the metalizing paste; and
thereaftersintering the metalizing paste and the green ceramic body by heating to a temperature of from about 1750°
C. to about 2000°
C. in a nitrogen or nitrogen-hydrogen mixture atmosphere to convert the metalizing paste and the green ceramic body into said sintered metalized aluminum nitride body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification