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Cobalt-based alloy and cladding layer prepared from the cobalt-based alloy

A technology of cobalt-based alloy and cladding layer, which is applied in metal material coating process, coating, melt spraying and other directions to achieve the effect of refining grain size, improving strength and preventing thermal crack propagation

Active Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still a challenge for high-temperature wear-resistant alloys in conditions of severe temperature changes and high-speed friction, such as high-speed train brake discs.

Method used

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  • Cobalt-based alloy and cladding layer prepared from the cobalt-based alloy
  • Cobalt-based alloy and cladding layer prepared from the cobalt-based alloy
  • Cobalt-based alloy and cladding layer prepared from the cobalt-based alloy

Examples

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Effect test

Embodiment 1

[0050] A cobalt-based alloy, comprising cobalt Co, nickel Ni, chromium Cr, iron Fe, silicon Si, tungsten W and carbon C elements, the cobalt-based alloy also includes aluminum Al elements, the specific content of the cobalt-based alloy by weight The chemical composition is: Ni 19wt%, Cr 18wt%, Al8.5wt%, Fe 1.1wt%, Si 1.0wt%, W 4.4wt%, C 0.9wt%, the balance is Co and less than 0.1wt% unavoidable Impurities; the mass percentage of Ni and Co is about 0.40; the mass percentage of Ni and Al is about 2.24. The cobalt-based alloy is 80-150 μm powder.

[0051] A cobalt-based alloy cladding layer prepared from the above-mentioned cobalt-based alloy. The cobalt-based alloy cladding layer is prepared by melting the cobalt-based alloy at high temperature and depositing it on the surface of the substrate. In this example, the preparation method is laser cladding , the process parameters used are: laser power 1800W; spot diameter 4mm; laser spot defocus amount 30mm, positive defocus; powde...

Embodiment 2

[0056] A cobalt-based alloy, comprising cobalt Co, nickel Ni, chromium Cr, iron Fe, silicon Si, tungsten W and carbon C elements, the cobalt-based alloy also includes aluminum Al elements, the specific content of the cobalt-based alloy by weight The chemical composition is: Ni 22.5wt%, Cr 19.5wt%, Al10.5wt%, Fe 1.1wt%, Si 1.0wt%, W 4.4wt%, C 0.9wt%, the balance is Co and less than 0.1wt% Impurities to avoid; the mass percent of Ni to Co is about 0.56, and the mass percent of Ni to Al is about 2.14. The cobalt-based alloy is 80-150 μm powder.

[0057] A cobalt-based alloy cladding layer prepared from the above-mentioned cobalt-based alloy. The cobalt-based alloy cladding layer is prepared by melting the cobalt-based alloy at high temperature and depositing it on the surface of the substrate. In this example, the preparation method is laser cladding , the process parameters used are: laser power 1500W; spot diameter 4mm; laser spot defocus amount 30mm, positive defocus; powder ...

Embodiment 3

[0063] A cobalt-based alloy, comprising cobalt Co, nickel Ni, chromium Cr, iron Fe, silicon Si, tungsten W and carbon C elements, the cobalt-based alloy also includes aluminum Al elements, the specific content of the cobalt-based alloy by weight The chemical composition is: Ni 20wt%, Cr 19.5wt%, Al7.5wt%, Fe 1.1wt%, Si 1.0wt%, W 4.4wt%, C 0.9wt%, the balance is Co and less than 0.1wt% unavoidable impurities; the mass percentage of Ni and Co is about 0.44, and the mass percentage of Ni and Al is about 2.67. The cobalt-based alloy is 80-150 μm powder.

[0064] A cobalt-based alloy cladding layer prepared from the above-mentioned cobalt-based alloy. The cobalt-based alloy cladding layer is prepared by melting the cobalt-based alloy at high temperature and depositing it on the surface of the substrate. In this example, the preparation method is laser cladding , the process parameters used are: laser power 2200W; spot diameter 5mm; laser spot defocus amount 40mm, positive defocus;...

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Abstract

Provided are a cobalt-based alloy and a cladding layer prepared from the cobalt-based alloy. The cobalt-based alloy comprises Co, Ni, Cr, Fe, Si, W, C and Al. The cobalt-based alloy is specifically prepared from, by weight, 19-22.5% of Ni, 18-19.5% of Cr, 7.5-10.5% of Al, 0.8-1.1% of Fe, 0.7-1.0% of Si, 3.0-4.4% of W, 0.6-0.9% of C, and the balance Co and smaller than 0.1% of inevitable impurities, and the mass percent of Ni and Co is greater than 0.4 but smaller than 0.56, and the mass percent of Ni and Al is greater than 2 but smaller than 2.7. The cobalt-based alloy can be used for preparing the cladding layer with high abrasion resistance performance and heat fatigue resistance performance, and the cladding layer not only can be used for repairing and enhancing a friction layer of a brake disc, but also can be used as the friction layer of the brake disc and a protection layer on the surface of other metal materials needing to bear repeated heat impact and having friction abrasion in the environments like mold cavity linings, engine pistons and inner cylinders, petroleum pipeline valve inner walls.

Description

technical field [0001] The invention relates to a cobalt-based alloy and a cladding layer prepared from the cobalt-based alloy, belonging to the field of metal alloy materials. Background technique [0002] When high-speed trains are braked during operation in high-cold, ice-snow conditions, the brake disc will be severely scratched, and there will be furrow-like scratches on the friction surface of the brake disc, with a depth of more than 5mm. The cause of severe scratches is that the ice and snow adhering to the brake disc and brake pads are mixed with hard particles. During the braking process, the ice and snow melt and the hard particles are sandwiched between the brake disc and brake pads to produce abrasive wear, and Iron filings are produced. Due to the coating of ice and snow, the iron filings cannot be discharged smoothly, and participate in the subsequent abrasive wear process, resulting in furrow-like scratches on the friction surface of the brake disc. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/07C23C4/134C23C4/08C23C24/10
CPCC22C19/07C23C4/08C23C4/134C23C24/106
Inventor 陈辉吴影刘艳李洪玉
Owner SOUTHWEST JIAOTONG UNIV
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