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Coatings for articles used with molten metal

A technology of molten metal and coating, applied in the direction of coating, metal processing equipment, casting melt container, etc., can solve the adverse effects of wear resistance and service life, ceramic thick coating cannot be widely used for metal transfer and storage And other issues

Inactive Publication Date: 2005-09-28
铸造中心控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thick ceramic coatings are not widely used in metal transfer and containment devices due to delamination issues and thermal expansion mismatch, which can adversely affect their ability to effectively thermally insulate metal devices, wear resistance and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The bond coat was applied to the prepared metal surface using a Miller Thermal SG 100 Plasma Spray Torch thermal spray unit. The powder of the bond coat is Metco 480-NS grade fully alloyed spherical powder, which is nickel 95% aluminum 5% powder made by air spraying method, and its particle size range is not more than 90 microns and not less than 45 microns. The process setpoints used are as follows:

[0033] Voltage: 33

[0034] Current: 650

[0035] Plasma Gas: 50 psi Argon and 50 psi Helium

[0036] Powder feed rate: 1.5 rpm at 35 psi

[0037] Spray distance: 100mm

[0038] Ceramic and polymer powders are mixed and thermally sprayed to form a codeposited coating on a pouring ladle used to transfer molten metal to a negative mold that defines the surface of a low pressure metal molded part. The ceramic powder is Metco 210 (NS / NS-1 / NS-1-G) grade 24% magnesia stabilized zirconia with a particle size range of not more than 90 microns and not less than 11 microns, a ...

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Abstract

An improved multilayer coating for use on molten metal holding and transfer apparatus, the coating including a bond layer applied directly to the surface of molten metal holding and transfer apparatus, and a porous layer of ceramic material produced by co-deposition of a powder of said ceramic material and a powder of a suitable organic polymer material and, after the co-deposition, heating of said polymer material to thermally decompose the polymer material and form the porous layer. The bond layer preferably is formed of a metallic, intermetallic or composite particulate materials. The metal component may be in the metallic, intermetallic, oxide, clad or alloyed form consisting of any one or more of the metal components selected from the group of Mo, Ni, Al, Cr, Co, Y and W and may be in combination with yttria, alumina, zirconia, boron, carbon and have a particle size in the range of 5 to 250 m, typically 40 to 125 m. The bond layer preferably has a thickness of 5 to 300 m with a substantially uniform coating layer being provided over the surfaces to have the porous ceramic coat applied.

Description

field of invention [0001] This invention relates to the coating of devices for handling molten metals, in particular for transferring, stirring and containing molten metals. Background of the invention [0002] In many molten metal operations, equipment used to handle the molten metal often has coatings that protect its surfaces from the abrasive and corrosive effects of the molten metal. In particular, cermet coatings have been used for many years to modify the surface properties of refractory materials that come into contact with molten metal tanks, launders, ladles, skimmers and siphons. All of these devices are in contact with the flowing molten metal, thereby subjecting the coating not only to the corrosive action of the molten metal, but also to the abrasive action of the drag force of the molten metal on the coating surface. The insulating properties of the coating also prevent heat loss from the molten metal. [0003] One possible way to solve the abrasion problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22D17/30B22D41/02B22D41/54F27D1/00
CPCB22D41/54B22D41/00B22D41/02
Inventor M·加赫迪S·古利齐亚
Owner 铸造中心控股有限公司