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Nickel base alloy powder for manufacturing anticorrosive coating of boiler tube

An anti-corrosion coating, nickel-based alloy technology, applied in the direction of coating, metal material coating process, etc., can solve the problems of inability to meet process requirements, unstable performance, uneven composition, etc., to solve the problems of corrosion resistance, wear resistance, high Hardness and strength, effect of improving grain boundary quality

Active Publication Date: 2012-10-03
四川大成涡轮设备再制造技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Although the alloy powders for laser cladding given by the above technical scheme can achieve certain technical effects in repairing specific equipment parts, they cannot meet and be suitable for laser cladding of other specific substrates due to their own process characteristics. Especially in the application of laser cladding technology to manufacture anti-corrosion coatings, there are still defects such as cracks, inclusions, pores, uneven composition, unstable performance, etc.
According to the search by the applicant, there is no relevant report on this kind of alloy powder with anti-corrosion ability and stable performance for manufacturing boiler tube anti-corrosion coating at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Use pulverized coal furnace boiler tube. The surface of the pipe wall is polished with sandpaper and cleaned with acetone before cladding. The chemical composition of the alloy powder used is: Cr: 43%; Ti: 6%; Si: 0.2%; Nb: 0.2%; Y: 0.2%; Hf: 0.1%; B; 0.3%; Ni: the balance. Using CO2 gas laser, the selected laser cladding process parameters are: power: 3000~5000W; spot diameter: 4mm, scanning speed: 8mm / s, powder thickness: 0.8mm.

[0030] After laser cladding, the thickness of the anti-corrosion layer is about 0.8mm. The surface of the anti-corrosion layer is smooth without cracks, pores and other defects. The combination of the anti-corrosion layer and the base material is metallurgical bonding, and the anti-corrosion performance is good.

example 2

[0032] The base material selected in this embodiment is No. 45 workpiece. The surface of the workpiece is ground with sandpaper to remove the oxide bearing layer and fatigue layer, and cleaned with acetone before cladding. The chemical composition of the nickel-based alloy powder used is: Cr: 42%; Ti: 8%; Si: 0.3%; Nb: 0.3%; Y: 0.3%; Hf: 0.2%; B; 0.2%; Ni: the balance . With a 5000W CO2 gas laser, the selected laser cladding process parameters are: power: 3000~4000W, spot diameter: 4mm, scanning speed: 6mm / s, powder thickness: 0.8mm.

[0033]After laser cladding, the thickness of the obtained anti-corrosion layer is about 0.8mm. The surface of the anti-corrosion layer is smooth without cracks, pores and other defects. The combination of the anti-corrosion layer and the base material is metallurgical bonding, and the anti-corrosion performance is good.

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Abstract

The invention relates to nickel base alloy powder for manufacturing an anticorrosive coating of a boiler tube, which comprises 40 to 45 percent of Cr, 4 to 8 percent of Ti, 0.1 to 0.3 percent of Si, 0.1 to 0.3 percent of Nb, 0.1 to 0.3 percent of Y, 0.1 to 0.3 percent of Hf, 0.1 to 0.3 percent of B and the balance of Ni. The nickel base alloy powder has the excellent comprehensive properties by selecting strengthening elements of an alloy matrix and strengthening elements of a grain boundary of grain refinement and selecting the percentage content of each element preferably, so that the alloyhas a higher melting point and higher wear-resisting and corrosion-resisting properties besides moderate rigidity and strength. Therefore, the crack resistance, moldability, process stability and component uniformity of the alloy powder in laser cladding coatings are improved fundamentally, and the requirements of the boiler tube on comprehensive properties of temperature resistance, corrosion resistance, wearing resistance, high strength and the like of the cladding coatings are met.

Description

technical field [0001] The invention relates to an alloy powder material suitable for laser cladding, in particular to a nickel-based alloy powder with anti-corrosion capability and stable performance for manufacturing boiler tube anti-corrosion coatings, which belongs to C23C24 / 10 in the international patent classification table (2006.01) I technical field. Background technique [0002] Corrosion and wear of boiler tubes is a serious problem in industrial boilers, causing serious production hazards and economic losses. Low-temperature thermal corrosion is the most common corrosion form of boiler tubes during operation, and low-temperature thermal corrosion may occur in the range of 500-750 °C. [0003] At present, the manufacturing methods of anti-corrosion coating mainly include spraying, spray welding and so on. The anticorrosion coatings prepared by these methods have some insurmountable problems. The anti-corrosion layer is very thin, it is easy to fall off during us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/05C22C30/00
Inventor 刘豫陈常义陈江
Owner 四川大成涡轮设备再制造技术有限公司