Powdered material used for preparing high-temperature wear-resistant cladding layer and preparation method thereof

Abstract

The invention discloses a powdered material used for preparing a high-temperature wear-resistant cladding layer and a preparation method thereof, belonging to the technical field of surface engineering. The powdered material comprises the following components by weight percent: 6-28% of TiB2, and the balance of Ni-Cr-Mo-Fe-Nb-B-Si-C alloy powder, wherein the Ni-Cr-Mo-Fe-Nb-B-Si-C alloy powder comprises the following ingredients by weight percent: 23-28% of Cr, 1-3% of Mo, 2-4% of Fe, 0.5-1% of Nb, 3-4.5% of B, 3.5-4.5% of Si, 0.5-1.3% of C and the balance of Ni. The preparation method comprises the steps of preparing powdered raw materials and mixed powder, and preparing the mixed powder to be the cladding layer used for the anti-abrasion treatment of a water cooling wall tube of a circulating fluidized bed boiler, or used for the anti-abrasion treatment of mill exhausters in a thermal power plant or an impeller of an induced draft fan. A TiB2 ceramic particle reinforced wear-resistant cladding layer is prepared by adopting a laser cladding technology, the surface microhardness ranges from 1000-1200HV, the technical requirements of high temperature and wear resistance of the water cooling wall tube of the circulating fluidized bed boiler are met, and the service life of the water cooling wall tube can be prolonged obviously.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular provides a powder material and a preparation method for preparing a high-temperature wear-resistant cladding layer; it is mainly used for anti-wear treatment of water-cooled wall tubes of circulating fluidized bed boilers, and can also be used for fire Anti-abrasion treatment of powder exhaust machine and induced draft fan impeller in power plant. Background technique [0002] Abrasion is the main cause of failure of water wall tubes in circulating fluidized bed boilers. At present, thermal spraying technology is generally used at home and abroad to carry out anti-wear treatment on water wall tubes of circulating fluidized bed boilers. The spraying materials used include powder core wire and powder materials. The powder core wire for arc spraying generally adopts stainless steel strip or iron belt as the outer skin, and the powder material in the powder core wire ma...

AI Technical Summary

Problems solved by technology

However, at present, there are few powder material systems for laser cladding suitable for anti-wear of circulating fluidized bed boiler water wall tubes, such as Ni-Cr-B-Si, Ni-Cr-B-Si-C and other systems commonly used in laser cladding The hardness of the cladding layer formed by the powder is 700-900HRC, which is significantly lower than the hardness value of the oxide particles contained in coal

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