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Process for the treatment of amorphous carbon or graphite manufactured articles, for the purpose of improving their resistance to oxidation, solutions suitable for attaining such purpose and resulting product

  • US 3,881,039 A
  • Filed: 08/21/1973
  • Issued: 04/29/1975
  • Est. Priority Date: 01/22/1971
  • Status: Expired due to Term
First Claim
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1. PROCESS FOR GIVING RESISTANCE TO OXIDATION TO MANUFACTURED ARTICLES MADE OF AMORPHOUS CARBON OR GRAPHITE, CHARACTERIZED BY THE FACT THAT:

  • A. SAID MANUFACTURED ARTICLES ARE DEGASSED AND IMMERSED, UNDER VACUUM, IN A SOLUTION OBTAINED BY MIXING;

    WATER;

    PHOSPHORIC ACID;

    ONE OR MORE COMPOUNDS SELECTED FROM THE GROUP OF SALTS, OXIDES AND HYDROXIDES OF A METAL OF THE 2ND GROUP OF THE PERIODIC SYSTEM;

    ONE OR BOTH COMPONENTS OF THE GROUP FORMED BY SOIDUM TETRABORATE DECAHYDRATE AND BORIC ACID;

    ONE OR MORE COMPONENTS SELECTED FROM THE GROUP FORMED BY NITRIC ACID, SODIUM NIRITE, AND SODIUM CARBONATE;

    THE COMPONENTS OF THE SAID SOLUTION ARE MIXED IN ACCORDANCE WITH PERCENTAGE RATIOS BY WEIGHT RANGING BETWEEN 57.0 * 0.1 ;

    16.9 ;

    0.0 AND 76.0 ;

    10.0 ;

    6.0 ;

    2.0 ;

    6.0 REPECTIVELY;

    B. THE SAID MANUFACTURED ARTICLES ARE IMPREGNATED WITH SAID SOLUTION;

    C. THE SAID MANUFACTURED ARTICLES ARE ALLOWED TO DRY AND SEASON AT ROOM TEMPERATURE.

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