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Metal ceramic powders used for thermal spraying on furnace roller surface

A cermet and ceramic powder technology, which is applied in the field of cermet powder, can solve the problems of poor high temperature wear resistance of coatings, weakened anti-pillow effect and wear resistance, and deterioration of coating properties.

Active Publication Date: 2011-09-21
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, as the demand and production volume of continuously annealed high-strength steel plates increase, and the annealing temperature increases, the anti-buildup and wear-resistant properties of the coatings mentioned in the above-mentioned patent documents are weakened.
This is mainly because high-strength steel plates usually contain a relatively high content of Mn (0.6-3.5%), and then Mn oxide buildup is easily formed during high-temperature annealing heat treatment, which deteriorates the coating performance.
At the same time, under the conditions of high temperature and high tension, the high temperature wear resistance of the coating often deteriorates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The cermet powder contains 25% Cr, 8% Al, 0.7% Y, 9% Ta, 5% Al 2 o 3 and 20% TiB 2 , and the balance is at least one of Co and Ni.

[0034] The protective coating on the surface of the cermet furnace roller is prepared by supersonic flame spraying method, and the thickness of the coating is about 0.15mm. The size of the anti-buildup sample is 50×50×10mm, and the material is 304 stainless steel. The specific method of the anti-build-up test: add a layer of MnO powder with a particle size of less than 44 μm on the surface of the coating. 2 -3%H 2 atmosphere, 950°C for 48 hours, and then take it out to analyze the tumor accumulation. The size of the coating friction and wear resistance sample is 12.32×12.32×19.05mm, and the material is 304 stainless steel; the size of the grinding pair is φ49.22×13.06mm, and the material is 45 quenched and tempered steel. The results are shown in Table 1.

Embodiment 2

[0036] The cermet powder contains 25% Cr, 8% Al, 0.7% Y, 9% Ta, 10% Al 2 o 3 and 10% TiB 2 , and the balance is at least one of Co and Ni. Others are the same as embodiment 1.

Embodiment 3

[0038] The cermet powder contains 25% Cr, 8% Al, 0.7% Y, 9% Ta, 10% Al 2 o 3 and 15% TiB 2 , and the balance is at least one of Co and Ni. Others are the same as embodiment 1.

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Abstract

The invention provides metal ceramic powders used for thermal spraying on a furnace roller surface. The metal ceramic powders, consisting of alloy powders and ceramic powders, comprise, by weight, 13-25% of Cr, 3-10% of Al, 0.1-1% of Y, less than 12% of Ta and balance being at least one of Co and Ni. The metal ceramic powders are characterized in that: the ceramic powders contain TiB2 and Al2O3, which account for, by weight, 15-25% of total weight of the metal ceramic powders. In the invention, anti-buildup performance and friction and wear resistance performance of thermal spray coatings made by the metal ceramic powders can be effectively improved. Excellent comprehensive properties can be maintained in harsh conditions of real production.

Description

technical field [0001] The invention relates to a cermet powder, in particular to a cermet powder for thermal spraying. Background technique [0002] In order to obtain steel strip products with excellent properties, the steel strip usually needs to be heat treated in a continuous annealing furnace. The surface of the annealed steel strip must be free from defects such as scratches, stains or minor flaws. At the same time, the original surface quality of the steel strip obtained in the hot and cold working process must also be maintained in the annealing. Since the heat treatment is usually in a micro-oxidizing environment, the temperature is 600-1100 ° C, high-speed operation, and a certain tension load. Therefore, improving the surface condition of the conveying steel strip furnace roller is not only the key to ensure the quality of the continuous annealing steel strip, but also can meet the requirements of long life and high efficiency of continuous annealing production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04C23C4/06C23C4/10C22C30/00C22C32/00C23C4/129
Inventor 赵春涛毕刚袁巨郝荣亮
Owner BAOSHAN IRON & STEEL CO LTD
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