Method for preparing high-carbon high-niobium high-chromium wear-corrosion resistance alloy coating by utilizing supersonic spraying and pre-alloyed powder used in method

A pre-alloyed powder, supersonic spraying technology, applied in the field of pre-alloyed powder, can solve the problems of less wear resistance than ceramic coatings, reduce the wear resistance of coatings, and limit application conditions, so as to avoid clogging of spray nozzles, Reduce the difficulty of atomization and save energy

Active Publication Date: 2018-12-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the common alloy coating prepared by the prior art is easy to partially dissolve in the substrate during heating and remelting, and the crystal grain grows rapidly in the high-temperature melting state, which reduces the wear resistance of the coating, and the common coating alloy material The carbide and carbon content of the ceramic coating is low, and the wear resistance is generally inferior to that of the ceramic coating, so its application conditions are limited. layer method

Method used

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  • Method for preparing high-carbon high-niobium high-chromium wear-corrosion resistance alloy coating by utilizing supersonic spraying and pre-alloyed powder used in method
  • Method for preparing high-carbon high-niobium high-chromium wear-corrosion resistance alloy coating by utilizing supersonic spraying and pre-alloyed powder used in method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Preparation of high carbon, high niobium and high chromium pre-alloyed powder:

[0043] Fe-Nb and Fe-Cr iron alloy powder and C element powder are used as raw materials to mix the ingredients according to the proportion to obtain the mixed powder. Add cemented carbide balls, forming agents and wet grinding media to the mixed powder, and cemented carbide balls are mixed with The mass ratio of the powder is 1:8, the amount of the molding agent added is 4wt% of the total mass of the mixed powder and cemented carbide balls, and the volume ratio of the total mass of the mixed powder and cemented carbide balls to the wet grinding medium is 1kg: 6L, and then placed in a high-energy ball mill for ball milling under nitrogen protection atmosphere conditions. After the ball milling, a 200-mesh sieve was used to filter and separate the powder slurry, and a preheated inert gas was used for spray drying and granulation. After cooling to room temperature, high Carbon high niobium hig...

Embodiment 2

[0045] Preparation of high carbon, high niobium and high chromium pre-alloyed powder:

[0046] Fe-Nb, Fe-Mo, Fe-Cr and Fe-B iron alloy powders and Fe, V, Co and C element powders are used as raw materials to mix according to the proportion to obtain mixed powder, and cemented carbide balls are added to the mixed powder , forming agent and wet grinding medium, the mass ratio of cemented carbide balls to mixed powder is 1:8, the amount of forming agent added is 4wt% of the total mass of mixed powder and cemented carbide balls, mixed powder and hard The ratio of the total mass of the alloy balls to the volume of the wet grinding medium is 1kg: 6L, and then placed in a high-energy ball mill for ball milling under the condition of a nitrogen protective atmosphere. The inert gas is spray-dried and granulated, and the high-carbon, high-niobium, and high-chromium pre-alloyed powder is obtained after cooling to room temperature.

Embodiment 3

[0048] Preparation of high carbon, high niobium and high chromium pre-alloyed powder:

[0049] Fe-Nb, Fe-Mo, Fe-Cr and Fe-B iron alloy powders and Fe, V, Ni and C element powders are used as raw materials to mix according to the proportion to obtain mixed powder, and cemented carbide balls are added to the mixed powder , forming agent and wet grinding medium, the mass ratio of cemented carbide balls to mixed powder is 1:6, the amount of forming agent added is 4wt% of the total mass of mixed powder and cemented carbide balls, mixed powder and hard The ratio of the total mass of the alloy balls to the volume of the wet grinding medium is 1kg: (6~8)L, and then placed in a high-energy ball mill for ball milling under nitrogen protection atmosphere conditions. After the ball milling, use a 200-mesh screen to filter and separate the powder slurry , use preheated inert gas for spray drying and granulation, and obtain high carbon, high niobium and high chromium pre-alloyed powder afte...

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Abstract

The invention relates to the technical field of thermal spraying and material surface protection, and particularly relates to a method for preparing a high-carbon high-niobium high-chromium wear-corrosion resistance alloy coating by utilizing supersonic spraying and pre-alloyed powder used in the method. Aimed at solving the problems that a common alloy coating prepared in the prior art can be easily dissolved partially in a matrix when being heated and re-melted, crystal grains rapidly grow in a high-temperature molten state, abrasion resistance of the coating is reduced, content of carbide and carbon in a common coating alloy material is low, the wear resistance is generally as good as that of the ceramic coating, so that the application working condition of the common coating alloy material is limited, the following preparation process is adopted for preparing the high-carbon high-alloy amorphous pre-alloyed powder and comprises the following steps of weighing raw materials and mixing the raw materials, adding a cemented carbide ball, a forming agent and a wet grinding medium, and carrying out ball milling under a protective atmosphere; filtering and drying to obtain the pre-alloyed powder; and the pre-alloyed powder is used for preparing the high-carbon high-niobium high-chromium wear-corrosion resistance alloy coating through adopting the supersonic spraying method. According to the method, the coating has the advantages of being high in density and smooth in surface.

Description

technical field [0001] The invention relates to the technical field of thermal spraying and material surface protection, in particular to a method for preparing a high-carbon, high-niobium, high-chromium wear-resistant alloy coating by supersonic spraying and the pre-alloyed powder used therein. Background technique [0002] Severe cavitation and sediment wear problems generally exist on the surface of hydraulic turbine flow parts. Cavitation can cause fish scale pits on the surface of the workpiece or make the surface appear spongy, which seriously reduces the output and efficiency of the turbine; on the other hand, hard particles such as sediment mixed in the high-speed water flow can cause serious erosion to the flow parts of the turbine wear and tear. Anti-abrasion coating technology is to apply a heterogeneous coating with specific properties on the surface of ordinary materials to improve the strength, wear resistance, corrosion resistance and high temperature resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06C22C38/26C22C38/22C22C38/24C22C38/32C22C38/36B22F9/04
CPCB22F9/04B22F2009/041B22F2009/043C22C38/22C22C38/24C22C38/26C22C38/32C22C38/36C23C4/06C23C4/129
Inventor 张惠斌郑国渠曹华珍陈小明张磊
Owner ZHEJIANG UNIV OF TECH
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