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Method for submerged-arc plasma cladding of alloy coating

A technology of plasma cladding and alloy coating, which is applied in the coating process and coating of metal materials, can solve problems such as defects, poor powder feeding uniformity, and large dilution rate, so as to improve internal and external quality and reduce production Cost, the effect of reducing oxidation burning loss

Active Publication Date: 2017-05-31
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 submerged-arc plasma cladding of an alloy coating. The method is mainly characterized in that in the powder feeding process of plasma cladding, alloy powder is required to be fed in front of a plasma arc, a flux for submerged-arc welding is required to be fed behind the plasma arc, the mass content of the flux is adjusted to be 10-30% of that of the alloy powder, and scanning is started on the surface of a workpiece according to a set running track; in the cladding process, the alloy powder is molten to form a coating, and the flux which is molten later covers the coating; and after the clad coating is solidified, the skull of the clotted flux covering the surface of the coating is knocked off. According to the method, submerged-arc surfacing is introduced into the plasma cladding technology, so that the technical defects that a conventional process for plasma cladding of the alloy coating is high in loss rate of alloy powder, the lost powder can not be recycled, under-cooking is caused by insufficient melting of excessive powder due to poor powder feeding uniformity, or the dilution rate is high when the powder is excessively less are avoided.

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 Applications(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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