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Method for improving high-temperature mechanical performance of surface of zirconium alloy

A technology of high-temperature mechanics and zirconium alloy, which is applied in metal material coating process, fusion spraying, coating, etc., can solve the problems of zirconium alloy failure and insufficient high-temperature mechanical properties, and achieve high-temperature mechanical properties and dense coating structure , The effect of simple preparation process

Pending Publication Date: 2020-12-11
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the high-temperature mechanical properties of the zirconium alloy surface, which uses thermal spraying to prepare a coating on the zirconium alloy surface to improve the high-temperature mechanical properties of the zirconium alloy surface, and solves the high-temperature mechanical properties of the zirconium alloy when it is in service in a nuclear power reactor. Insufficient zirconium alloy failure

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  • Method for improving high-temperature mechanical performance of surface of zirconium alloy

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Effect test

Embodiment 1

[0024] A method for improving the high-temperature mechanical properties of the zirconium alloy surface, the specific steps are as follows:

[0025] (1) Weigh 15g of metal-phase Ni powder with a particle size of 35-55μm and 85g of ceramic-phase MoB powder with a particle size of 20-40μm, and dry the mixed powder and balls in a vacuum at 70°C before ball milling Dry it in the box for 7 hours. In the high-energy ball mill, under the protection of argon, the ball mill is ground at a speed of 120rpm, a total grinding time of 120 minutes and a ball-to-material ratio of 10:1 to make a coated composite powder. The selected particle size range is 40 ~70 μm ceramic coated metal composite powder.

[0026] (2) The surface of the substrate to be sprayed is roughened by sandblasting and cleaned.

[0027] (3) Feed the ceramic coated metal composite powder obtained in step (1) into the powder feeder of the spraying equipment, and use the plasma spraying equipment to carry out coating sprayi...

Embodiment 2

[0030] A method for improving the high-temperature mechanical properties of the zirconium alloy surface, the specific steps are as follows:

[0031] (1) Weigh 25g of metal phase Co powder with a particle size of 35-55 μm and ceramic phase ZrB with a particle size of 20-40 μm 2 Powder 75g, put mixed powder and ball before ball milling and be placed in 90 ℃ of vacuum ovens and dry 5h, in high-energy ball mill, by argon protection, ball mill with the rotating speed of 150rpm, the total milling time of 140 minutes and 10: Grinding with a ball-to-material ratio of 1 to make coated composite powder, select ceramic coated metal composite powder with a particle size range of 40-70 μm.

[0032] (2) The surface of the substrate to be sprayed is roughened by sandblasting and cleaned.

[0033] (3) Feed the ceramic coated metal composite powder obtained in step (1) into the powder feeder of the spraying equipment, and use the plasma spraying equipment to carry out coating spraying on the ...

Embodiment 3

[0036] A method for improving the high-temperature mechanical properties of the zirconium alloy surface, the specific steps are as follows:

[0037] (1) Weigh 20 g of metal phase NiCrAl powder with a particle size of 35-55 μm and ceramic phase HfB with a particle size of 20-40 μm 2 Powder 80g, put mixed powder and ball before ball milling and be placed in 80 ℃ of vacuum ovens and dry 6h, in high-energy ball mill, by argon protection, ball mill with the rotating speed of 130rpm, the total milling time of 130 minutes and 10: Grinding with a ball-to-material ratio of 1 to make coated composite powder, select ceramic coated metal composite powder with a particle size range of 40-70 μm.

[0038] (2) The surface of the substrate to be sprayed is roughened by sandblasting and cleaned.

[0039](3) Feed the ceramic-clad metal composite powder obtained in step (1) into the powder feeder of the spraying equipment, and use the plasma spraying equipment to carry out coating spraying on th...

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Abstract

The invention discloses a method for improving the high-temperature mechanical performance of the surface of a zirconium alloy, and belongs to the field of nuclear structure materials. According to the method, a coating is prepared on the surface of the zirconium alloy through thermal spraying to improve the high-temperature mechanical performance of the zirconium alloy, and the coating is prepared from the following raw materials in parts by weight: 15-25 parts of a metal phase and 75-85 parts of a ceramic phase; the metal phase is one of Ni, Co, NiCrAl and CoCrAl; and the ceramic phase is one of MoB, ZrB2, CrB2, HfB2 and TiB2. According to the metal-ceramic coating, the metal phase is uniformly dispersed and distributed in the ceramic phase, the metal phase is fully molten, the wettability to the ceramic phase is good, but no chemical reaction occurs between the metal phase and the ceramic phase, ceramic phase particles are kept in the original shape and structure, the coating is compact, the microhardness of the coating can reach 1520 (HV), and the metal-ceramic coating is a high-temperature coating with excellent mechanical performance. The coating prepared through the method is low in cost, has a large neutron absorption cross section, is a good neutron absorption and shielding coating material, is suitable for nuclear reactor nuclear structure materials, is simple in manufacturing process and can be prepared in a high-flux manner.

Description

technical field [0001] The invention relates to a method for improving the high-temperature mechanical properties of the zirconium alloy surface, which belongs to the field of nuclear structural materials. Background technique [0002] At present, more than 95% of commercial nuclear power plants in operation in the world generally use zirconium alloy tubes as cladding materials in uranium dioxide-zirconium fuel systems, which are prone to serious problems under extreme conditions. For example, the "Three Mile Island Nuclear Accident" in the United States in 1979 and the "Fukushima Nuclear Accident" in Japan in 2011 both caused failure due to insufficient mechanical properties of the zirconium alloy cladding at high temperatures. Zirconium alloys have good corrosion resistance in high temperature and high pressure water and steam at 300-400 °C, and have quite good resistance to neutron radiation in the stack. However, the development of accident-tolerant fuels with excellent...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/134
CPCC23C4/06C23C4/134
Inventor 宋鹏李青黄太红易健宏李才巨
Owner KUNMING UNIV OF SCI & TECH
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