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Laser cladding on low heat resistant substrates

A substrate and laser technology, applied in laser welding equipment, pressure inorganic powder coating, fusion spraying, etc., can solve problems such as cracking, interface erosion, loss, etc.

Inactive Publication Date: 2008-07-23
PRAXAIR ST TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With thinner thicknesses of 0.010 to 0.020 inches, the coating is rapidly lost due to extremely high surface loads coupled with wedging of fine dross (iron-zinc-aluminum intermetallics), and this coating cannot produce significant economic benefits
On the other hand, thick spray-fused coatings can crack, causing interface attack by zinc or aluminum

Method used

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  • Laser cladding on low heat resistant substrates

Examples

Experimental program
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Effect test

Embodiment

[0078] The laser plating process is performed with a Nd:YAG laser. Process parameters are listed below. Inject the surface covering material into the melt pool. A guided laser beam is moved across the surface of the part, creating a weld bead. Plating causes the individual beads to overlap by a certain index to produce a plated layer. The coating is then polished. Figure 1 schematically illustrates the Nd:YAG laser-plated surface of a CoCrC coating applied to a copper substrate according to this example. Figure 2 illustrates a Nd:YAG laser plated and polished surface of a CoCrC coating applied to a copper substrate according to this example.

[0079] Base Metal: Copper (Cu)

[0080] Surface covering material: CoCrC alloy

[0081] Laser: Nd:YAG, pumped diode, fiber transmission with a maximum output power of 5kW

[0082] Laser power used: 4kW

[0083] Laser spot size: about 3mm in diameter.

[0084] Surface speed: 250~400mm / min

[0085] Index: 1.5mm

[0086] Powder f...

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Abstract

This invention relates to the laser coating of components used in high temperature-corrosive applications, such as those associated with lances, nozzles and tuyeres of metallurgical vessels, to extend their service life under such severe conditions. In particular, the present invention relates to a method of coating a high melting point material onto a substrate having a melting point temperature lower than that of the high melting point material, the method comprising: (a) moving a laser beam generated by a laser across the surface of the substrate a surface, said laser beam consisting of a wavelength of about 300 to about 10,600 nm; (b) supplying metal, alloy or metal-alloy composite powder to the surface of said substrate; and (c) generating sufficient power to the laser, to heat the surface of the substrate and achieve fusion bonding between the metal, alloy or metal-alloy composite material powder and the surface of the substrate.

Description

field of invention [0001] The present invention relates to methods of laser plating refractory metals, alloys and / or metal composites onto low heat resistant substrates such as copper or similar materials. In particular, the invention relates to laser coating of components used in high temperature-corrosion applications, such as those associated with metallurgical vessel lances, nozzles and tuyeres, etc., to extend their service life under such severe conditions. Background of the invention [0002] Tuyeres, often mounted on actuator tubes, inject air, oxygen and fuel into blast furnaces and furnaces such as Pierce-Smith converters. Similar to tuyeres, gas injector nozzles inject oxygen and fuel into the molten steel bath of an electric arc furnace. In addition, lance nozzles inject oxygen and fuel into the basic oxygen furnace for steelmaking. These lances, nozzles and tuyeres are usually water-cooled and made of high thermal conductivity copper or copper-based alloys wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/34C22C19/07C22C19/03C22C19/05C21C5/46C22C32/00
CPCB23K26/32B23K26/34B23K35/0244B23K35/3033B23K35/304B23K35/3046B23K26/342B23K2103/12B23K2103/18B23K2103/26C21C5/4613C21C5/5217C22C19/03C22C19/05C22C19/07C23C4/06C23C4/18C23C24/04C23C4/126Y02P10/20
Inventor H·H·福库巴亚什R·C·加斯曼
Owner PRAXAIR ST TECH INC
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