Sink roll multicomponent alloy coating and preparing and spraying method thereof

A multi-element alloy and sinking roll technology, applied in chemical instruments and methods, metal material coating technology, coating, etc., can solve the problems of rough film and substrate bonding, low service life, pitting corrosion, etc., and achieve improvement Mechanical matching and physical compatibility, thermal stress reduction, good high temperature oxidation resistance

Inactive Publication Date: 2017-07-07
安徽威龙再制造科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems in the prior art that the surface of the sinking roller is prone to pitting and corrosion pits and becomes rough, and the combination degree of the film la

Method used

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  • Sink roll multicomponent alloy coating and preparing and spraying method thereof
  • Sink roll multicomponent alloy coating and preparing and spraying method thereof
  • Sink roll multicomponent alloy coating and preparing and spraying method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The sunken roller multi-element alloy coating of the present embodiment, as figure 1 As shown, from the inside to the outside are the base layer of the sinking roller, the transition layer and the working layer, the transition layer is NiCrAl sprayed layer; the working layer is NiCr-Cr 3 C 2 Composite coating.

[0059] The sinking roller multi-element alloy coating material preparation of the present embodiment: NiCrAl nano-powder, NiCr-Cr 3 C 2 mixed nanopowder;

[0060] In this embodiment, a method for spraying the multi-element alloy coating of the sunken roller, the steps are:

[0061] Step 1) pre-treatment: mechanically grinding the surface of the sinking roller, followed by sandblasting;

[0062]Step 2) Spraying: Spraying is carried out by the HVOF method.

[0063] The sinking roller multi-alloy coating and its preparation and spraying method of the present embodiment spray NiCrAl on the base layer of the sinking roll as the metal bonding layer, that is, the...

Embodiment 2

[0065] The basic structure of the sunken roller multi-alloy coating of this embodiment is the same as that of Embodiment 1, except that the transition layer is a NiCrAlY sprayed layer. Ni can react with Al to form intermetallic compounds and release a large amount of heat to form a micro-metallurgical bond between the bonding base layer and the sinking roll base layer, and the appropriate addition of Y element can effectively reduce the oxidation of the material and further improve the bonding strength between the substrate and the coating , so as to improve the bonding strength of the bonding bottom layer and the sinking roller base layer.

Embodiment 3

[0067] The sunken roll multi-element alloy coating of this embodiment has the same basic structure as that of Embodiment 1, the differences and improvements are: the thickness of the NiCrAlY sprayed layer is 50 μm, the Cr content is 10%, the Al content is 4%; the Y content is 3%, Ni content is 83%; NiCr-Cr 3 C 2 Composite coating thickness is 200μm, Cr 3 C 2 The content is 70%, and NiCr is 30%. The NiCr bonding layer in this percentage range is compatible with NiCr-Cr 3 C 2 Cermets have good mutual melting properties.

[0068] The sinking roller multi-element alloy coating material preparation of the present embodiment: NiCrAlY nanopowder, NiCr-Cr 3 C 2 Mixed nano powder, wherein, nano Cr 3 C 2 The preparation method of powder is:

[0069] Step 1: Mixing: put ammonium dichromate powder and nano-carbon black powder in distilled water with a weight ratio of 1:0.17, mix and stir evenly to form a fluid state, and add it to a square mold Compression molding is a precursor...

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Abstract

The invention discloses a sink roll multicomponent alloy coating and a preparing and spraying method thereof, and belongs to the technical field of sink roll repair. The sink roll multicomponent alloy coating sequentially comprises a sink roll base layer, a transition layer and a work layer from inside to outside, the transition layer is a NiCrAlY spraying layer, NiCrAlY is sprayed to the sink roll base layer to serve as a metal bonding layer, that is the transition layer, and the problem of mismatching of material heat expansion coefficients between a wear-resisting heat-resisting work layer and the sink roll base layer can be solved; the work layer is the NiCr-Cr3C2 composite coating, the NiCr alloy has the excellent heat resistance, corrosion resistance, high-temperature oxidation resistance and other properties, Cr3C2 has the good high-temperature hardness and high-temperature oxidation resistance, the hard phase effect is achieved, the coating is not soluble in zinc liquid and is not wetted, coating peeling and even failures caused by heat impact can be greatly reduced, and the technical problems are solved.

Description

technical field [0001] The invention relates to the technical field of repairing sinking rolls, in particular to a sinking roll multi-element alloy coating and a preparation and spraying method thereof. Background technique [0002] The sinking roll and stabilizing roll on the continuous hot-dip galvanizing production line are subjected to strong corrosion and penetration of the zinc metal solution due to long-term operation in the molten zinc solution at 500 ° C, and the surface of the roll is prone to pitting and corrosion pits and becomes rough, seriously affecting The flatness of the roller surface affects the surface quality of the galvanized sheet; at the same time, the speed of the steel strip driven by the roller surface is as high as 35-40m / s, which causes friction and wear, and the wear of the roller is very obvious. It needs to be replaced frequently, which increases the production cost. affect production efficiency. In order to improve and enhance the surface pe...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C4/06C23C4/073C23C4/129C01B32/914B82Y30/00
CPCB82Y30/00C23C2/003C23C2/06C23C4/06
Inventor 凤国保李志忠
Owner 安徽威龙再制造科技股份有限公司
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