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Joining of rough carbon-carbon composites with high joint strength

  • US 5,972,157 A
  • Filed: 08/20/1996
  • Issued: 10/26/1999
  • Est. Priority Date: 11/20/1995
  • Status: Expired due to Fees
First Claim
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1. A reactive-bonding method for joining two carbon--carbon composite parts, each carbon--carbon part having at least one faying area, comprising the steps of:

  • a. preparing a reactive-bonding layer having a thickness ranging from about 25 to 2500 micrometers and a dimension matching the faying area of the carbon--carbon parts to be joined, said reactive-bonding layer being comprised of a mixture of fine particle-sized, carbide forming metallic ingredients, and carbon, and having a composition that is metal rich;

    b. assembling said carbon--carbon parts and said reactive-bonding layer to form a setup in which the reactive-bonding layer forms a joint interlayer between the parts;

    c. heating said setup under a compressive pressure in either a vacuum or an inert gas atmosphere for a time and at a temperature sufficient to complete a bonding reaction to form a compound selected from the group consisting of borides, carbides, silicides and nitrides and which compound is produced within said joint interlayer and between said joint interlayer and said carbon--carbon composite parts, forming a bond between said joint interlayer and between said carbon--carbon composite parts that is non-porous, wherein said metallic ingredients of said reactive-bonding layer have melting points, and said temperature of said heating of said setup can be reduced to a temperature that is less than one-half the melting point of the metallic ingredients.

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