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Method for preparing intermetallic compound powder cored filament material for electric arc spraying

An intermetallic compound and powder core wire technology, which is applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of insufficient reaction, low content of intermetallic compound phase, etc., and achieve the adjustment of process parameters. Flexibility, excellent corrosion and wear resistance, and the effect of excellent corrosion and wear resistance

Inactive Publication Date: 2007-05-30
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, this method has shortcomings such as insufficient reaction and low intermetallic compound phase content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1, taking the preparation method of Fe-Al intermetallic compound powder core wire material as an example to further describe the technical solution of the present invention:

[0009] (1) 4 kg of aluminum powder with a fineness of 230 orders and a purity of 99.5% and 8.4 kg of iron powder with a fineness of 325 orders and a purity of 99.5% are uniformly mixed;

[0010] (2) Inject the mixed powder into a steel mold of Φ20cm in a hydraulic press, apply a pressure of 20Mpa and press it into a compact with a diameter of 20cm;

[0011] (3) Coat the surface of the block with carbon powder and place it in a vacuumized combustion chamber, preheat it with a tungsten wire for 2 minutes, and suddenly increase the current to ignite it to cause a self-propagating reaction to obtain a loose block intermetallic compound ;

[0012] (4) Pulverize the obtained intermetallic compound, grind it in a ball mill, and select Fe-Al intermetallic compound powder materials with differe...

Embodiment 2

[0014] Example 2, the above-mentioned iron powder was changed to nickel powder, 8.8 kg of nickel powder and 4 kg of aluminum powder were taken, and the method of the above-mentioned implementation 1 was followed to obtain a Ni-Al intermetallic compound powder core wire.

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PUM

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Abstract

The preparation process of intermetallic compound filament with powder core for arc spraying includes the following steps: mixing aluminum powder of granularity 38-44 micron and purity not lower than 99.5 % and iron (nickel ) powder of granularity 53-61 micron and purity not lower than 99.5 % in the atom ratio of 1 to 1; pressing the mixture in a hydraulic press into blank and painting the surface with one thin graphite layer; self-spreading reaction in a vacuum combustor to obtain loose intermetallic compound block; crushing, grinding, sieving to obtain 200-325 mesh granularity powder material and drying; and making Fe (Ni)-Al compound filament with powder core. The present invention has good spraying performance, good coating layer performance, high performance / cost ratio, wide use temperature range, simple technological process and low power consumption.

Description

technical field [0001] The invention belongs to a preparation method of an intermetallic compound powder core wire material for electric arc spraying. technical background [0002] Arc spraying technology is widely used in the field of high temperature corrosion and protection of materials, and is widely used in electric power, coal, metallurgy and other fields. For example, the "four tubes" in power plant boilers, that is, superheater tubes, reheater tubes, economizer tubes and water wall tubes, are subject to erosion, wear and corrosion of hard particles and corrosive media, resulting in tube failure and shutdown. The problem is one of the main hidden dangers in the production of power plants. The use of arc spraying technology to obtain high-performance coatings has become one of the main means to solve the above problems. [0003] In the selection of spraying materials, for the general anti-corrosion and anti-wear requirements of equipment and structural parts, wire ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/08B22F3/16C23C4/131
Inventor 孙宏飞王灿明万殿茂宋强
Owner SHANDONG UNIV OF SCI & TECH
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