Multicomponent alloy coating for hot rolling roll and preparation method and coating method of multicomponent alloy coating

A multi-component alloy, hot roll technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the thermal shock resistance of surface wear roll coating material, hot roll prone to thermal cracking, surface peeling, etc. problems, to achieve good high temperature oxidation resistance, reduce thermal stress, excellent heat resistance effect

Inactive Publication Date: 2017-09-01
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 hot rolls are prone to thermal cracking, surface layer peeling, roll shaft fracture, surface wear, and existing coating bonding strength and insufficient uniformity

Method used

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  • Multicomponent alloy coating for hot rolling roll and preparation method and coating method of multicomponent alloy coating
  • Multicomponent alloy coating for hot rolling roll and preparation method and coating method of multicomponent alloy coating
  • Multicomponent alloy coating for hot rolling roll and preparation method and coating method of multicomponent alloy coating

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The hot roll multi-element alloy coating of the present embodiment, as figure 1 As shown, from the inside to the outside are the hot roll base layer, the transition layer and the working layer, the transition layer is NiCr sprayed layer; the working layer is NiCr-Cr 3 C 2 Composite coating.

[0055] The hot roll multi-element alloy coating material preparation of the present embodiment: NiCr nanopowder, NiCr-Cr 3 C 2 mixed nanopowder;

[0056] A kind of spraying method of the multi-component alloy coating of the present embodiment, the steps are:

[0057] Step 1) pre-treatment: mechanically grinding the surface of the hot roll, followed by sandblasting;

[0058] Step 2) Spraying: Spraying is performed by the HVOF method.

[0059] In the multi-element alloy coating of the hot roll and its preparation and spraying method in this embodiment, NiCr is sprayed on the base layer of the hot roll as a metal bonding layer, that is, a transition layer, which can eliminate th...

Embodiment 2

[0061] The basic structure of the multi-element alloy coating for hot rolling rolls in this embodiment is the same as that in Embodiment 1, except that the transition layer is a NiCrAl sprayed layer. Ni can react with Al to form intermetallic compounds and release a large amount of heat, so that the bonded bottom layer and the hot roll base layer form a micro-metallurgical bond, thereby improving the bonding strength of the bonded bottom layer and the hot roll base layer.

Embodiment 3

[0063] The basic structure of the multi-element alloy coating for hot rolling rolls of this embodiment is the same as that of Embodiment 1, the differences and improvements are: the thickness of the NiCr sprayed layer is 50 μm, the Cr content is 10%, and the Ni content is 90%; 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.

[0064] The hot roll multi-element alloy coating material preparation of the present embodiment: NiCr nanopowder, NiCr-Cr 3 C 2 Mixed nano powder, wherein, nano Cr 3 C 2 The preparation method of powder is:

[0065] 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; after compression, it is a blo...

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Abstract

The invention discloses a hot roll multi-element alloy coating and a preparation and spraying method thereof, belonging to the technical field of roll repair. A kind of hot roll multi-element alloy coating of the present invention, from inside to outside is hot roll base layer, transition layer and working layer successively, and transition layer is NiCr or NiCrAl spray coating, sprays NiCr or NiCrAl on hot roll base layer as metal bonding layer namely The transition layer can eliminate the problem of thermal expansion coefficient mismatch between the wear-resistant and heat-resistant working layer and the base layer of the hot roll; the working layer is NiCr‑Cr3C2 composite coating, and NiCr alloy has excellent heat resistance, corrosion resistance, high temperature oxidation resistance, etc. Performance, while Cr3C2 has good high temperature hardness and high temperature oxidation resistance, and acts as a hard phase. Moreover, NiCr-Cr3C2 has a linear expansion coefficient similar to that of hot rolling rolls, thereby greatly reducing the peeling or even failure of the coating caused by thermal shock, and solving the technical problem of the present invention.

Description

technical field [0001] The invention relates to the technical field of roll repair, in particular to a multi-element alloy coating for a hot roll and a preparation and spraying method thereof. Background technique [0002] Wear is one of the three main causes of failure of metal parts (wear, corrosion and fatigue). The economic loss it causes is very huge, such as the figure announced by the United States in 1981, the annual loss due to wear and tear is as high as 100 billion US dollars. Among them, the material consumption is about 20 billion US dollars, which is equivalent to 7% of the annual output of materials. Due to the poor wear resistance of materials, the lost life of a large number of basic parts in my country is generally much lower than that of foreign advanced products, so the direct and indirect economic losses are also very alarming. According to the incomplete statistics of the five industrial sectors of metallurgy, mining, agricultural machinery, coal, ele...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/073C23C4/10C23C4/129C23C4/02C23C4/18
CPCC23C4/06C23C4/02C23C4/073C23C4/10C23C4/129C23C4/18
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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