US 7,622,196 B2 · Metal cladding composition, additive, method and system

Abstract

The invented method of cladding a metal component includes creating a frit mixture in a defined ratio; wetting the mixture by adding a wetting agent in a defined volume; agitating the wetted mixture; applying the agitated mixture to a metal component by one or more processes; de-wetting the metal component having the applied mixture by gradually heating the same to a temperature from approximately 250 degrees Fahrenheit (° F.) up to a high of approximately 450° F.; and, fusing the de-wetted metal component at a temperature of no more than 125% of a defined withstand temperature for the clad metal component. Invented compositions can include one or more of liquid and/or colloidal sodium, potassium and/or lithium silicate, clay and/or clays, a compound of hollow micro-spheres (e.g. naturally occurring and nearly ubiquitous perlite and/or a synthetic hollow micro-sphere equivalent) and/or alumina or one or more flexible or malleable or resiliently deformable, impact-resistant materials such as plastomers, elastomers and/or other plastic, rubber, plastic-like or rubber-like materials; a wetting agent consisting of one or more of water or water and ethanol for fast drying under proper safety and venting conditions; and one or more surfactants and/or dispersants. A system and method for using the compositions and additives are also disclosed. An optional powder clad application method is included in the embodiment of the invention which method eliminates the de-wetting station(s) but makes it possible to add impact-resistant clad material for lower-temperature, higher-impact applications.

A clad metal product comprising:

a metal substrate comprising one or more selected from the group consisting of cast iron, low carbon steel, and stainless steel;
and
a first vitreous clad layer covering the metal substrate, wherein voids in the first vitreous clad layer are filled and sealed with fused nano-scale silicates, and wherein said voids included pinholes, fissures, fractures, and bubbles, the clad layer being further characterized as having a mineral hardness rating of greater than or equal to approximately 5-7 Mohs or a pencil hardness scratch test strength of approximately 350-660 HK on the Knoop scale, the first clad layer comprising a fused composite frit material with the nano-scale silicates incorporated therein, wherein the metal substrate and composite frit material comprise one or more selected from the group consisting of:
a cast iron substrate, and a first frit material of borax in a range of 3-47% by volume, feldspar in a range of 2-38% by volume, quartz in a range of 3-17% by volume, sodium nitrate in a range of 4-8% by volume, barium carbonate in a range of 6-7% by volume, cryolite in a range of 0-2% by volume, zinc oxide in a range of 1-16% by volume, fluorite in a range of 4-10% by volume, cobalt oxide in a range of 1-3% by volume, clay in a range of 2-20% by volume, copper oxide in a range of 0-3% by volume, and dry sodium silicate in a range of 2-5% by volume,
a low carbon steel substrate, and a second frit material of borax in a range of 1-29% by volume, quartz in a range of 3-46% by volume, soda ash in a range of 5-15% by volume, sodium nitrate in a range of 4-8% by volume, barium carbonate in a range of 1-6% by volume, titania in a range of 5-13% by volume, potassium nitrate in a range of 4-8% by volume, cryolite in a range of 0-1% by volume, zinc oxide in a range of 3-8% by volume, sodium pyrophosphate in a range of 2-8% by volume, clay in a range of 1-15% by volume, copper oxide in a range of 0-5% by volume, boric acid in a range of 2-5% by volume, iron oxide in a range of 1-8% by volume, and feldspar in a range of 10-40% by volume,
a low carbon steel substrate, and a third frit material of borax in a range of 3-36% by volume, feldspar in a range of 1-20% by volume, quartz in a range of 3-17% by volume, boric acid in a range of 0-15% by volume, nickel oxide in a range of 0-6% by volume, potassium oxide in a range of 3-6% by volume, alumina in a range of 15-40% by volume, cryolite in a range of 0-2% by volume, calcium oxide in a range of 3-12% by volume, clay in a range of 5-20% by volume, copper oxide in a range of 0-5% by volume, and dry sodium silicate in a range of 2-5% by volume, and
a stainless steel substrate, and a fourth frit material of borax in a range of 3-38% by volume, feldspar in a range of 1-15% by volume, quartz in a range of 3-46% by volume, boric acid in a range of 4-9% by volume, nickel oxide in a range of 0-23% by volume, zinc oxide in a range of 2-3% by volume, titania in a range of 5-13% by volume, potassium nitrate in a range of 1-4% by volume, alumina in a range of 5-40% by volume, calcium oxide in a range of 2-7% by volume, clay in a range of 2-20% by volume, copper oxide in a range of 0-5% by volume, and dry sodium silicate in a range of 2-5% by volume, flint in a range of 10-30% by volume, and iron oxide in a range of 1-8% by volume.

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Metal cladding composition, additive, method and system

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Metal cladding composition, additive, method and system

Life of this patent

Abstract

Claims10