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A method of semi-submerged arc plasma cladding alloy coating

A technology of plasma cladding and alloy coating, applied in metal material coating process, coating, etc., can solve problems such as defects, large dilution rate, poor powder feeding uniformity, etc., to improve internal and external quality and reduce oxidation Effects of burnout and expansion of the application field

Active Publication Date: 2018-12-14
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that the loss rate of alloy powder is high, and the lost powder cannot be recycled, and the uniformity of powder feeding is poor, resulting in insufficient melting when there is too much powder, or a large dilution rate when there is too little powder, and when the coating is solidified. Exposure to the air is prone to oxidized slag inclusions, pores, rough surfaces, etc.
[0004] There is not yet a method to solve the above-mentioned plasma cladding alloy coating process defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Take the plasma cladding iron-based wear-resistant coating as an example to illustrate:

[0018] (1), the composition ratio (wt%) is: Cr 28-40%, Si 1.5-2%, B 1.8-3.2%, Ni0-4%, Nb0.5-1%, C2.8-4.0%, The iron-based wear-resistant alloy powder with the balance of Fe is put into the front powder feeding tank, with a particle size of 80-270 mesh; the rear powder feeding tank uses submerged arc flux HJ107, and is crushed to a particle size of 80-200 mesh;

[0019] (2) Set the plasma arc scanning trace and speed program and the plasma arc power density. After the plasma arc starts, the powder and flux are fed synchronously. The powder feeding hole in the front of the plasma arc feeds the iron-based wear-resistant alloy powder; Feed the submerged arc flux HJ107 into the powder hole, adjust the mass content of the flux to 10-30% of the alloy powder, and carry out the plasma cladding process according to the set running track;

[0020] (3) After the cladding is comp...

Embodiment 2

[0021] Example 2: Taking the semi-submerged arc cladding of a typical nickel-based coating as an example

[0022] (1), the composition ratio (wt%) is: Cr 8-15%, Si 3-4%, B 2-3%, Mn0-0.4%, C0.5-0.7%, Fe3-5%, the balance Nickel-based alloy powder that is Ni is put into the front side powder feeding tank, with a particle size of 80-270 mesh; the rear side powder feeding tank uses submerged arc flux HJ107, and is crushed to a particle size of 80-200 mesh;

[0023] (2) Set the plasma arc scanning trace and speed program and the plasma arc power density. After the plasma arc starts, the powder and flux are fed synchronously. The powder feeding hole in the front of the plasma arc feeds the iron-based wear-resistant alloy powder; The submerged arc flux HJ107 is fed into the powder hole. Because the nickel-based alloy powder has good corrosion resistance, the flux content can be reduced to 10-15% of the alloy powder mass, and the plasma cladding process is carried out according to the ...

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Abstract

The invention discloses a method for semi-submerged arc plasma cladding alloy coating, which mainly requires alloy powder to be sent to the front of the plasma arc in the powder feeding process of plasma cladding, and the submerged arc welding flux to be sent to the back of the plasma arc to adjust The mass content of the flux is 10-30% of the alloy powder, and scans on the surface of the workpiece according to the set trajectory; during the cladding process, the alloy powder melts to form a coating and is covered by the subsequently molten flux; After the coating has solidified, the crust of flux slag that has condensed on the surface of the coating is knocked off. The present invention introduces submerged arc surfacing welding into the plasma cladding technology, which overcomes the high loss rate of gold powder in the existing plasma cladding alloy coating process, the lost powder cannot be recycled, and the poor uniformity of powder feeding causes the powder to melt when there is too much powder There are technical defects such as insufficient generation of intermingling, or large dilution rate when the powder is too small.

Description

technical field [0001] The invention belongs to the technical field of metal surface strengthening, in particular to a method for plasma cladding alloy coating. Background technique [0002] In construction machinery such as mining and mining, the surface of the parts worn by rock ore is generally used to improve the service life of the wear-resistant alloy coating. The commonly used alloy coating methods include surfacing welding, welding alloy block or plasma cladding. The good quality of cladding alloy coating has been widely used. [0003] At present, plasma cladding is mainly a synchronous alloy powder feeding method, that is, a certain amount of alloy powder is fed into the surface molten pool formed by the plasma arc, and an alloy coating of a certain thickness is formed after melting, mixing and condensation. The problem is that the loss rate of alloy powder is high, and the lost powder cannot be recycled, and the uniformity of powder feeding is poor, resulting in i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C37/10C22C19/05
CPCC22C19/058C22C37/06C22C37/08C22C37/10C23C24/103
Inventor 刘宁王淑峰
Owner SHANDONG UNIV OF SCI & TECH
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