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Powder for wear-resistant anti-corrosion protection of water wall tube and preparation method

A water-cooled wall pipe and powder technology, which is applied in the coating process and coating of metal materials, can solve the problems of poor high-temperature erosion resistance and affect the corrosion resistance of cladding layers, etc., and achieve long wear and corrosion resistance life, The effect of prolonging the life of wear and corrosion resistance and low production cost

Active Publication Date: 2012-11-14
北京国能德峰材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Ni-Cr alloy has poor high-temperature erosion resistance, and it still cannot effectively solve the erosion and wear problem of the water-cooled wall tube near the burner during low-NOx combustion.
Cr 3 C 2 -NiCr-like ceramic-metal composites have excellent high temperature erosion resistance and good sulfur corrosion resistance, but the Cr prepared by laser cladding method 3 C 2 -NiCr cladding layer is prone to produce more microcracks, which affects the corrosion resistance of the cladding layer

Method used

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  • Powder for wear-resistant anti-corrosion protection of water wall tube and preparation method
  • Powder for wear-resistant anti-corrosion protection of water wall tube and preparation method
  • Powder for wear-resistant anti-corrosion protection of water wall tube and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment

[0027] Example: Preparation of cladding layer on the heating surface of the water-cooled wall tube

[0028] 1. Preparation of powder raw materials

[0029] The weight percent scope of powder raw material is as follows:

[0030] CrB 2 Powder (particle size -140+325 mesh, purity 99.5%): 12 wt.%; C powder: 0.8wt.%; Ni-Cr-Ti-Mo-Fe-V alloy powder (particle size -140+325 mesh): Yu Amount; Among them, the composition of Ni-Cr-Ti-Mo-Fe-V alloy powder is: Cr: 25wt.%; Ti: 5wt.%; Mo: 3wt.%; Fe: 3wt.%; V: 0.8wt. %;Ni: balance.

[0031] 2. Preparation of mixed powder

[0032] (1) According to the various powder ratios described in step 1, weigh the required various powder raw materials;

[0033] (2) Put the powder raw material into a drying oven for drying, the temperature of the drying oven is 120°C, and the drying time is 4 hours;

[0034](3) Use the HS conical mixer to mix the powder raw materials to form a uniformly mixed powder, and the mixing time is 4 hours;

[0035] (4) Put ...

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Abstract

The invention relates to powder for wear resistant anti-corrosion protection of a water wall tube and a preparation method, belonging to the technical field of surface engineering. The powder comprises the following raw materials by weight: 6-15% of CrB2 powder, 0.3-2% of C powder and the balance of Ni-Cr-Ti-Mo-Fe-V alloyed powder, wherein the Ni-Cr-Ti-Mo-Fe-V alloyed powder comprises the following components: 20-28% of Cr, 3-10% of Ti, 1-3% of Mo, 1-3% of Fe, 0.5-1% of V and the balance of Ni. The preparation method comprises that wear resistant anti-corrosion protection powder used for the water wall tube is prepared, and a clad layer is prepared. The powder disclosed by the invention has the advantages of simultaneously meeting the technical requirements of high temperature wear resistance and anti-sulfur corrosion resistance of a boiler tube and obviously prolonging the service life of the water wall tube. Prepared clad layer materials have the characteristics of good tenacity and basically no cracks in the clad layer, and the surface microhardness of the clad layer materials is within the range of 400-900HV.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular provides a powder for wear-resistant and corrosion-resistant protection of water-cooled wall tubes and a preparation method thereof; the above-mentioned powder can be clad with laser to form a wear-resistant and corrosion-resistant powder on the outer surface of the water-cooled wall tube The cladding layer is suitable for wear-resistant and corrosion-resistant surface treatment of boiler water-cooled wall tubes and circulating fluidized bed boiler water-cooled wall tubes with low NOx combustion technology. Background technique [0002] In my country's primary energy structure, about 70-80% of electricity is converted from coal combustion. Nitrogen oxides (NOx) are the three major harmful substances (suspended particulate matter, SO 2 and NOx), about 5-30kg of nitrogen oxides are produced per ton of coal burned. According to statistics, in 2007, the total amount of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C23C24/10
Inventor 刘宗德马忠云李建平王永田李新芷袁明明李红川
Owner 北京国能德峰材料技术有限公司
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