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Anti-agglomeration high-temperature resistant coating of furnace bottom roller

A technology of high temperature resistance and hearth roller, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of low coating adhesion, easy peeling of coating, large coating voids, etc., to achieve Improved high temperature resistance life, good anti-buildup performance, excellent high temperature performance

Active Publication Date: 2012-08-29
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The traditional furnace roll coating uses a coating composition system of CoCrAlY-CrB 2 / Y 2 o 3 , the spraying method is supersonic or plasma, because these two spraying methods have relatively large gaps in the coating, and the surface after spraying has not been treated in any way. Generally, after 2 to 3 months of use, there will be tumors on the roller surface, and due to the bonding force of the coating Lower, the coating is more likely to peel off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] An anti-nodulation and high-temperature-resistant furnace bottom roller coating, which is composed of a primer layer, which includes the following components in mass percentage: Co: 38%, Cr: 30%, Ta: 18%, Al: 10%, y: 4 %.

[0047] The thickness of the coating is 0.12mm; the hardness of the coating is greater than Hv800.

[0048] The final surface roughness of the roller surface coating is Ra7.0. The surface of the roller body is sprayed by explosive spraying process.

Embodiment 2

[0050] An anti-nodulation and high-temperature-resistant furnace bottom roll coating, the coating includes a primer layer, and the primer layer includes the following components in mass percentage: Co: 45%, Cr: 22%, Ta: 20%, Al: 10%, y: 3%.

[0051] A working layer is coated on the primer layer, the basic composition of the working layer is ZrO 2 : 70%, Al 2 o 3 : 30%.

[0052] The total thickness of the coating is greater than 0.15mm, and the hardness of the coating is greater than Hv800.

[0053] The final surface roughness of the roller surface coating is Ra9.0. The surface of the roller body is sprayed by explosive spraying process.

Embodiment 3

[0055] An anti-nodulation and high-temperature-resistant furnace bottom roll coating, the coating includes a primer layer, and the primer layer includes the following components in mass percentage: Co: 50%, Cr: 25%, Ta: 15%, Al: 6%, y: 4%.

[0056] There is also a working layer on the bottom layer, which is composed of ZrO 2 : 75%, Al 2 o 3 : 25%.

[0057] The working layer is coated with a sealing layer consisting of 25-35% CrB-CrO 2 , and the rest are acid conditioners. CrB-CrO 2 The mass proportion of CrB in the medium is 30%, and the rest is CrO 2 . The basic composition of acid conditioning agent is: phosphoric acid 18%, zinc phosphate 12%, sodium phosphate 3%, aluminum dihydrogen phosphate 10%, water 57%.

[0058] The coating thickness is 0.16mm, and the coating hardness is greater than Hv800.

[0059] The final surface roughness of the roller surface coating is Ra7.0-9.0. The surface of the roller body is sprayed by explosive spraying process.

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Abstract

The invention provides an anti-agglomeration high-temperature resistant coating of a furnace bottom roller. The coating comprises a substrate, wherein the substrate includes the following components by weight: 35-63 percent of Co, 20-30 percent of Cr, 10-20 percent of Ta, 5-10 percent of Al and 2-5 percent of y. According to the invention, a metal-ceramic material is coated on a furnace bottom roller body in a spraying manner by adopting an explosion method, thus the characteristics of the surface of the furnace bottom roller body is changed, a better prevention of the agglomeration of the furnace bottom roller body is achieved, and further the high-temperature resistance of the furnace bottom roller is enhanced.

Description

technical field [0001] The invention relates to an anti-nodulation coating, in particular to a cermet coating. Background technique [0002] Sheet metal such as duplex stainless steel is a high-end metal product. The processing and forming of duplex stainless steel and other materials in the metallurgical industry can generally be divided into two forms: hot forming (hot rolling) and cold forming (cold drawing). [0003] The production process of hot-rolled duplex stainless steel and other materials is as follows: (1) the duplex stainless steel and other material plate billets are heated to 1100°C through a roller hearth furnace; (2) the slabs are rolled into required specifications by a hot rolling mill (3) Cut out the size required by the customer after edge trimming and shearing; (4) After heat treatment, car leveling, pickling and other processes, the properties of the duplex stainless steel and other materials are adjusted to the customer's requirements before delivery...

Claims

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Application Information

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IPC IPC(8): C23C4/08C23C4/073C23C4/11C23C4/126
Inventor 周强尹志平王建康石平高仁中
Owner BAOSHAN IRON & STEEL CO LTD
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