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Method-for-joining-ceramic-to-metal

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Method for joining ceramic to metal

Details

Inventors: Gasdaska, Charles; Limoncelli, Edward V.;
Assignee: AlliedSignal Inc. (Morristown, NJ)
Primary Examiner: Ryan; Patrick
Assistant Examiner: Johnson; Jonathan
Attorney, Agent or Firm: Zak, Jr., Esq.; William J.

Metal and ceramic members are joined together by a braze joint including a member made of bar stock molybdenum, a first ductile member brazed between the molybdenum member and the metal member, and a second ductile member brazed between the molybdenum member and the ceramic member. The braze joint may be used to join a ceramic wheel shaft to a metal shaft in a turbomachine. The braze joint allows torsion to be transmitted between the ceramic wheel shaft and the metal shaft without the use of a metal sleeve.

DETAILED DESCRIPTION The present invention may be regarded as a braze joint that allows torsion loads to be transmitted between metal and ceramic turbomachine components.
An interlayer is placed between a metal member and a ceramic member.
The interlayer includes ductile members and a molybdenum member of the bar stock type.
The ductile members are joined (e.
g.
, brazed) to the molybdenum member, and the ductile members are brazed to the metal and ceramic members.
If the ductile members are also brazed to the molybdenum member, the braze joint can be formed in a single brazing step.
The braze joint is sleeveless, which eliminates the need for low-expansion sleeve metals that are expensive and hard to procure.

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