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α-Al2O3 and Ti2O3 protective coatings on aluminide substrates

  • US 6,599,636 B1
  • Filed: 10/31/2000
  • Issued: 07/29/2003
  • Est. Priority Date: 10/31/2000
  • Status: Expired due to Fees
First Claim
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1. A process for forming a specific reactive element bilayer barrier on a titanium aluminide substrate, the process comprising:

  • creating a hydrogen atmosphere with a concentration of water vapor below 750 ppm at a temperature above about 550°

    C. contiguous to a surface of the titanium aluminide substrate on which the barrier layer is to be formed;

    maintaining the temperature above 550°

    C. and water vapor concentration below 750 ppm; and

    reacting the gaseous hydrogen/water vapor atmosphere with specific reactive elements at the titanium aluminide substrate surface and with oxygen to form a specific reactive element oxide barrier layer which is strongly bonded to the substrate surface, said barrier layer having an aluminum oxide layer at a substrate/barrier layer interface and a titanium oxide layer at a barrier layer/gas interface.

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