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Ceramic-metal structure

  • US 10,639,736 B2
  • Filed: 07/14/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 07/19/2016
  • Status: Expired due to Fees
First Claim
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1. A ceramic-metal structure in which a pipe-shaped or rod-shaped metallic body is inserted into a through hole extending through a ceramic substrate from a surface of the ceramic substrate in a thickness direction thereof or is coaxially disposed just above the through hole,the ceramic-metal structure comprising:

  • an annular pad layer made of a metal and disposed on the surface of the ceramic substrate to be located around the through hole;

    an annular ring member joined to the pad layer via a first brazing filler portion and having a coefficient of thermal expansion smaller than that of the metallic body;

    a second brazing filler portion intervening between the ring member and the metallic body and joining the ring member and the metallic body together; and

    a brazing filler flow prevention layer which covers an outer surface of the pad layer in such a manner as to expose a central region of an upper surface of the outer surface of the pad layer, the upper surface facing the first brazing filler portion,wherein the first brazing filler portion joins the central region and the ring member together without projecting to a radially inner side and a radially outer side of the brazing filler flow prevention layer.

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