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Cobalt-free nickel-based alloy

A technology based on alloy and cobalt-nickel, which is applied in metal processing equipment, metal material coating technology, coating, etc., can solve the problems of threat to maintenance personnel, increase of maintenance time, lack of cobalt resources, etc., and achieve excellent wear resistance, reduce cost effect

Inactive Publication Date: 2011-08-10
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of cobalt-based alloys and the lack of cobalt resources in my country, Chinese scientific and technological workers have been looking for substitutes for cobalt-based alloys.
In addition, for valves working in a nuclear environment, cobalt-based alloys present a major defect: Co-59 in the wear and corrosion debris of cobalt-based alloys will form Co-60 isotopes after being excited by neutron irradiation, and Co- 60 is a strong radioactive source with an extremely long half-life, which will increase the maintenance time and threaten the maintenance personnel during shutdown maintenance, and will also greatly increase the difficulty and cost of nuclear fuel shielding

Method used

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  • Cobalt-free nickel-based alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of cobalt-free nickel-based alloy powder, according to weight percentage, each component and its content are:

[0044] Carbon (C): 1.0%, Chromium (Cr): 25%, Tungsten (W): 4.2%, Silicon (Si): 2.5%, Aluminum (Al): 7%, Molybdenum (Mo): 4.5%, Boron ( B): 0.8%, yttrium oxide (Y 2 o 3 ): 5%, the rest is nickel (Ni), the nickel-chromium alloy powder mixture is obtained by mechanical ball milling, the powder particle size reaches 200-300 mesh, and dried;

[0045] Use ether to dissolve methyl cellulose as a binder, mix it with the above powder mixture to form a paste, and evenly pre-coat a layer of ring-shaped pre-coating with a thickness of 2.0mm on the sealing surface of the nuclear power valve of the stainless steel substrate, and dry it in the oven medium drying;

[0046] (2) Place the nuclear power valve to be processed on the laser processing machine tool, and guide the laser working head directly above the target area;

[0047] (3) On the nuclear power...

Embodiment 2

[0050] Carry out high-temperature wear test to the sealing face coating obtained in embodiment one (high-temperature wear test method is referred to L.Dubourg, D.Ursescu, et al..Laser Cladding of MMC coatings on aluminum substrate: influence of composition and microstructure on mechanicalproperties[J]. Wear, 258(1-2): 1745-1754.), friction and wear test conditions: rotation speed v = 200r / min, load F = 500g, friction track radius r = 6mm, temperature rises from normal temperature to 360°C in the first 5 minutes , and then continue to keep warm for 120min, and the grinding ball is a SiN ball with a diameter of 6mm, without lubrication.

[0051] The result is as figure 2 Shown, embodiment one gained sealing surface coating and Stellite06 wear volume are respectively 0.682mm 3 and 0.6465mm 3 .

Embodiment 3

[0053] (1) Preparation of cobalt-free nickel-based alloy powder, according to weight percentage, each component and its content are:

[0054] Carbon (C): 1.2%, Chromium (Cr): 27%, Tungsten (W): 5.8%, Silicon (Si): 2.8%, Aluminum (Al): 10.0%, Molybdenum (Mo): 6.0%, Boron ( B): 0.8%, yttrium oxide (Y 2 o 3 ): 2.0%, and the rest is nickel (Ni). Mix and prepare the required mixed powder with a stirring ball mill. The particle size of the powder is 200-300 mesh, and dry in an oven;

[0055] (2) Place the nuclear power valve to be processed on the laser processing machine tool, and guide the laser working head directly above the target area;

[0056] (3) On the nuclear power valve sealing surface of the 1Cr18Ni9Ti austenitic stainless steel substrate, a laser with a power of 6000W is used to irradiate the surface of the substrate to form a molten pool, and the prepared alloy powder is synchronously fed in. The powder carrier gas is nitrogen, and the nitrogen is simultaneously As ...

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Abstract

The invention discloses cobalt-free nickel-based alloy powder. The cobalt-free nickel-based alloy powder comprises the following components in percentage by weight: 1.0 to 1.2 percent of carbon (C), 24.0 to 28.0 percent of chromium (Cr), 4.0 to 6.0 percent of wolfram (W), 2.4 to 2.8 percent of silicon (Si), 6.0 to 10.0 percent of aluminum (Al), 4.0 to 6.0 percent of molybdenum (Mo), 0.8 to 1.0 percent of boron, 1.0 to 5.0 percent of yittrium oxide (Y2O3) and the balance of nickel (Ni). The alloy coating prepared by combining the formula of the cobalt-free nickel-based alloy powder with the laser cladding process has a compact structure and no defects, can be well and metallurgically combined with a nuclear valve substrate and has high wear resistance at a high temperature, so that the cobalt-free nickel-based alloy powder is particularly suitable for a nuclear valve sealing face and meets the requirements of the valve working in a nuclear environment.

Description

technical field [0001] The invention belongs to the field of alloy materials, and relates to a cobalt-free nickel-based alloy, in particular to a cobalt-free nickel-based alloy applied to strengthening coatings on sealing surfaces of nuclear power valves. Background technique [0002] Valves occupy a considerable proportion in mechanical products, especially in nuclear power, thermal power, petrochemical, metallurgy and other industries, valves play a key role and are used in a very large amount. With the advancement of science and technology, in recent years, the valves used in various valve industries at home and abroad are developing in the direction of high parameters, such as large size, high temperature and high pressure resistance, strong corrosion resistance and strong friction, high reliability and long life. [0003] The service conditions of high-parameter valves are quite harsh, and the required safety and reliability are very high. For example, nuclear-grade va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C23C24/10B23K26/34B22F9/04
Inventor 刘双傅戈雁张宗列陆建东魏宏璞
Owner SUZHOU UNIV
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