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Coated metal article and method of making the same

  • US 3,867,166 A
  • Filed: 07/10/1972
  • Issued: 02/18/1975
  • Est. Priority Date: 01/27/1969
  • Status: Expired due to Term
First Claim
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1. A COMPOSITE STRUCTURE TO BE SUBSEQUENTLY FIRED AT AN ELEVATED TEMPERATURE, COMPRISING A METAL BASE, AND A MIXED FRIT COMPOSITION DISPOSED ON A SURFACE OF THE BASE, SAID COMPOSITION COMPRISING A MIXTURE OF (A) A SUBSTANTIALLY FULLY DEVITRIFIED GLASS FRIT COMPOSED OF AN AMORPHOUS GLASS MATRIX ANDCONTAINING A SUBSTNTIALLY PORTION OF DEVITRIFIED CRYSTALLINE SILICATE PARTICLES AND BEING SUBSTANTIALLY FREE OF CRYSTOBALITE PARTICLES, AND (B) A CORROSION RESISTANT SUBSTNTIALLY NONDEVITRIFIABLE GLASS FRIT CONTAINING FROM 63% TO 80% BY WEIGHT OF SILICA, SAID MIXED FRIT COMPOSITION BEING SUBSEQUENTLY FIRED AT AN ELEVATED TEMPERATURE TO FUSE THE COMPOSITION TO THE METAL, SAID AMORPHOUS GLASS MATRIX TENDING TO DISSOLVE IN SAID CORROSION RESISTANT GLASS FRIT DURING SAID FIRING WHILE RETAINING THE IDENTITY OF THE DEVITRIFIED CRYSTLLINE PARTICLES TO PROVIDE A RESULTING CRYSTLLINE-GLASS COATING HAVING IMPROVED ABRASION RESISTANCE, IMPACT RESISTANCE, AND TOUGHNESS AND EXCELLENT CORROSION RESISTANCE.

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