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Nickel-base alloy coating for sealing surface of nuclear power valve and preparing method for nickel-base alloy coating

A nickel-based alloy and valve sealing technology, which is applied in the coating of nuclear power valve sealing surface and nickel-based alloy coating field, can solve the problem of lack of serialized special powder materials, few special material systems for laser cladding, increased difficulty of nuclear shielding and Cost and other issues, to achieve the effect of short thermal action time, high hardness and toughness, and high bonding surface strength

Inactive Publication Date: 2014-01-01
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cobalt-based alloys have two inevitable defects: on the one hand, in the nuclear radiation environment, the Co in the alloy 59 The stimulated Co 60 Isotopes will prolong the half-life of nuclear radiation, cause difficulties for shutdown and maintenance, and increase the difficulty and cost of nuclear shielding; on the other hand, cobalt-based alloys are expensive, and cobalt resources are extremely scarce in my country
However, there are few special material systems for laser cladding, and there is a lack of serialized special powder materials

Method used

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  • Nickel-base alloy coating for sealing surface of nuclear power valve and preparing method for nickel-base alloy coating
  • Nickel-base alloy coating for sealing surface of nuclear power valve and preparing method for nickel-base alloy coating
  • Nickel-base alloy coating for sealing surface of nuclear power valve and preparing method for nickel-base alloy coating

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Embodiment 1

[0036] Embodiment 1: A nickel-based alloy coating for the sealing surface of a nuclear power valve is prepared from a nickel-based alloy powder material by laser cladding. The composition of the nickel-based alloy powder material is calculated as:

[0037] Chromium (Cr): 20.0-24.0%, Silicon (Si): 4.0-4.2%, Boron (B): 3.0-3.5%, Molybdenum (Mo): 3.0-3.2%, Iron (Fe): 8.0-8.5%, Carbon (C): 1.0-1.2%, yttrium oxide (Y 2 o 3 ) 0.8 to 1.0%, and the rest is nickel.

[0038] Among them, the content of the required carbon element can be completely composed of external chromium carbide (Cr 3 C 2 ) The carbon element in the element is provided; at the same time, the chromium carbide (Cr 3 C 2 ) also provides part of the chromium element, and the remaining chromium element is provided by the addition of fine pure chromium metal.

[0039] The particle size of the finally obtained nickel-based alloy powder is 200-300 mesh.

[0040]The preparation method of the present embodiment compri...

Embodiment 2

[0063] Embodiment 2: A nickel-based alloy coating used for the sealing surface of nuclear power valves is prepared by laser cladding from nickel-based alloy powder materials, and the composition of the nickel-based alloy powder materials is calculated as:

[0064] Chromium: 13.5-16.2%, silicon: 4.0-4.2%, boron: 3.0-3.5%, molybdenum: 3.0-3.2%, iron: 8.0-8.5%, chromium carbide: 7.5-9%, yttrium oxide 0.8-1.0%, The rest is nickel.

[0065] Its preparation method comprises the following steps:

[0066] (1) Obtain the nickel-based alloy powder material described in claim 1 or 2 with a mechanical mixing method, and the powder particle size is 200~300 orders;

[0067] (2) dissolving the silicic acid resin material with ethanol as an adhesive, blending with the nickel-based alloy powder material, coating the sealing surface of the nuclear power valve as a pre-coat, and baking and drying;

[0068] (3) The power density is 136~181J / mm 2 The laser irradiates the pre-laid coating, and a...

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Abstract

The invention discloses a nickel-base alloy coating for a sealing surface of a nuclear power valve, and is characterized in that the nickel-base alloy coating is prepared according to a method of conducting laser-cladding on nickel-base alloy powder. The nickel-base alloy powder comprises the following constituents by weight percent: 20.0 to 24.0 percent of Cr, 4.0 to 4.2 percent of Si, 3.0 to 3.5 percent of P, 3.0 to 3.2 percent of Mo, 8.0 to 8.5 percent of Fe, 1.0 to 1.2 percent of C, 0.8 to 1.0 percent of yttrium oxide, and Ni in balancing amount. The laser-cladding process adopts a synchronous powder feeding method and a pre-coating method. The nickel-base alloy powder mixture contains no noble metal Co, thereby particularly meeting requirements on valves under nuclear environments; and due to the formulation design of the mixture, and the advantage of the laser-cladding technology in coating preparing, the coating on the sealing surface has a favorable high-temperature property.

Description

technical field [0001] The invention relates to a sealing surface coating, in particular to a coating used for the sealing surface of a nuclear power valve, in particular to a nickel-based alloy coating. Background technique [0002] Due to the particularity of the nuclear industry, the harsh working environment, and the safety issues caused by natural disasters, higher requirements are placed on the performance of nuclear power valves. At present, the surfacing materials for sealing nuclear power valves are generally cobalt-containing alloys, such as Stellite 6 or Stellite 21. Stellite alloy has good high temperature friction and wear resistance, heat corrosion resistance and thermal fatigue resistance, etc. Therefore, cobalt-based alloys are often used in nuclear power valve sealing surfaces with harsh conditions and high requirements for wear resistance and corrosion resistance. However, cobalt-based alloys have two inevitable defects: on the one hand, in the nuclear rad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/05
Inventor 傅戈雁徐爱琴张宗列石世宏王晨张辉
Owner SUZHOU UNIV
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