Claims
- 1. A ceramic plate substrate which consists of a material having a hexagonal crystal structure and is coated with metal at least on one side, said metal coated side being used for carrying electronic power components, characterized in that a metal-coated ceramic plate with improved resistance against cyclic temperature changes is formed by selecting and coating such a ceramic plate that has a relative degree of texture of the ceramic in the (006)-pole figure of less than 5.
- 2. A plate according to claim 1, characterized in that the ceramic material is alumina and the relative degree of texture in the (006)-pole figure is less than 4.5.
- 3. A ceramic plate substrate, which is coated with metal at least on one side, characterized in that the crystallites of the ceramic material have a random orientation.
- 4. A plate according to claim 1, characterized in that the ceramic material is alumina and the relative degree of texture in the (006)-pole figure is less than 3.5.
Priority Claims (1)
Number |
Date |
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38 14 486.7 |
Apr 1988 |
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Parent Case Info
This application is a continuation of application Ser. No. 07/613,484 filed Oct. 29, 1990 now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4659606 |
Wada et al. |
Apr 1987 |
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4808463 |
Yoshikatsa et al. |
Feb 1989 |
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Non-Patent Literature Citations (2)
Entry |
Wittmer et al "Mechanical Properties of Liquid-phase bonded copper-ceramic substrates" Jour. of The Amer. Ceramic Soce. vol. 65, No. 3, Mar. 1982. |
Nakada et al "Surface texture formation of Al.sub.2 O.sub.3 Substrates" Journ. of the Amer. Ceramic Soce. vol. 58, No. 9-10, Sep./Oct. 1975. |
Continuations (1)
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Number |
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Parent |
613484 |
Oct 1990 |
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