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Powder core wire as well as preparation method and application thereof

A kind of powder core wire material and powder core technology, which are applied in the field of powder core wire material and its preparation

Active Publication Date: 2014-09-10
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty in the preparation of nanomaterials, and the nanocrystals obtained by large mechanical deformation (such as rolling, etc.) have a large internal stress, which leads to rapid grain growth during the recovery and recrystallization process. material performance degradation
Therefore, it is difficult for nanomaterials to be widely used in industry

Method used

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  • Powder core wire as well as preparation method and application thereof
  • Powder core wire as well as preparation method and application thereof
  • Powder core wire as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of powder core wire material, which is made of a stainless steel belt covering a powder core. The powder core composition is a mixture of seven element powders, and its weight percentage range is as follows: 45% Cr, 5% B, 2% Al, 3% Si, 3% Nb, 10% Mo, and the balance is Fe. The stainless steel belt is made of 304L stainless steel belt, and the weight ratio of the powder core to the stainless steel belt is 0.43:1.

[0044] The preparation method of powder core wire material comprises the following steps:

[0045] (1) Mix the seven element powders of the powder core, add alcohol, and wet mix in a ball mill for 5 hours to obtain a mixture. The volume ratio of alcohol to powder is 2:5, and the weight ratio of stainless steel balls to mixed powder in the ball mill 5:1, ball mill speed ≤150r / min;

[0046] (2) Place the mixture in a rotary evaporator, dry until the alcohol evaporates, then put the dried mixture in an oven at a temperature lower than 60 ℃ for 5 hours, a...

Embodiment 2

[0056] A kind of powder core wire material, which is made of a stainless steel belt covering a powder core. The powder core composition is a mixture of seven element powders, and its weight percentage range is as follows: 35% Cr, 2% B, 1% Al, 5% Si, 5% Nb, 10% Mo, and the balance is Fe. The stainless steel belt is made of 304L stainless steel belt, and the weight ratio of the powder core to the stainless steel belt is 0.67:1.

[0057] The preparation method of powder core wire material comprises the following steps:

[0058] (1) Mix the seven element powders of the powder core, add alcohol, and wet mix in a ball mill for 6.25 hours to obtain a mixture, in which the volume ratio of alcohol to powder is 1:2, and the weight ratio of stainless steel balls to the mixed powder in the ball mill 6:1, ball mill speed ≤150r / min;

[0059] (2) Place the mixture in a rotary evaporator, dry until the alcohol volatilizes, then put the dried mixture in an oven at a temperature lower than 60...

Embodiment 3

[0069] A kind of powder core wire material, which is made of a stainless steel belt covering a powder core. The powder core composition is a mixture of seven element powders, and its weight percentage range is as follows: 30% Cr, 5% B, 5% Al, 3% Si, 15% Nb, 2% Mo, the balance being Fe. The stainless steel belt is made of 316L stainless steel belt, and the weight ratio of the powder core to the stainless steel belt is 0.61:1.

[0070] The preparation method of powder core wire material comprises the following steps:

[0071] (1) Mix the seven element powders of the powder core, add alcohol, and wet mix in a ball mill for 7.5 hours to obtain a mixture. The volume ratio of alcohol to powder is 3:5, and the weight ratio of stainless steel balls to mixed powder in the ball mill 7:1, ball mill speed ≤150r / min;

[0072] (2) Place the mixture in a rotary evaporator, dry until the alcohol volatilizes, then put the dried mixture in an oven at a temperature lower than 60 ℃ for 7 hours, a...

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Abstract

The invention discloses a powder core wire as well as a preparation method and application thereof. The powder core wire is prepared by coating a powder core in a stainless steel strip; the powder core is prepared by mixing seven element powder in percentage by weight: 30-50% of Cr, 2-10% of B, 1-5% of Al, 1-5% of Si, 3-15% of Nb, 2-10% of Mo and the rest amount of Fe; the skin of the powder core wire selects the stainless steel strip; the weight ratio of the powder core to the stainless steel strip is (0.43-0.67): 1; when a coating layer is prepared by adopting an electric arc spraying technology, oil and rust on the surface of a matrix are removed firstly; and then, the pretreatment such as sand blasting is performed. The powder core wire can obtain the coating layer with low porosity, high hardness and excellent high-temperature oxidization and sulphuration corrosion resistance, and is suitable for such high-temperature structural members as a boiler pipe, a roller and an engine cylinder body.

Description

technical field [0001] The invention relates to the field of thermal spraying in material processing engineering, in particular to a powder core wire material and its preparation method and application. Background technique [0002] Circulating fluidized bed boilers use a large amount of low-quality coal with high impurity content, so that the boiler pipes are exposed to harsh environments such as high temperature, vulcanization, fly ash, and slag. Boiler tube failures such as tube bursts caused by high temperature oxidation, thermal corrosion and high temperature erosion have always been a technical and economic problem to be solved urgently in the power industry. Such accidents not only seriously affect the safe operation of power plants, but also cause huge economic losses. [0003] With the development of thermal spraying technology and its wide application in power plant boilers, the use of thermal spraying technology for corrosion protection and rapid repair of boiler...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C22C27/06C22C30/00C22C38/32C23C4/12B22F1/00C23C4/131
Inventor 吴玉萍郭文敏洪晟高文文张建峰
Owner HOHAI UNIV
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