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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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 impr

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

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Example Embodiment

[0023]Example 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 metallic 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 grinding balls at 70℃ in vacuum before ball milling Dry in the box for 7 hours. In a high-energy ball mill, protected by argon, the ball mill is milled at 120 rpm, a total grinding time of 120 minutes, and a ball-to-battery ratio of 10:1 to produce a coated composite powder with a particle size range of 40 ~70μm ceramic coated metal composite powder.

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

[0027](3) The ceramic-coated metal composite powder obtained in step (1) is fed into the powder feeder of the spraying equipment, and the plasma spraying equipment is used to spray the coating on the surface of the pretreated ...

Example Embodiment

[0029]Example 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 the metal phase Co powder with a particle size of 35~55μm and the ceramic phase ZrB with a particle size of 20~40μm2Powder 75g, first put the mixed powder and the grinding ball in a vacuum drying oven at 90℃ for 5h before ball milling. In a high-energy ball mill, protected by argon, the ball mill is at a speed of 150rpm, a total grinding time of 140 minutes and 10: The ball-to-material ratio of 1 is ground to produce coated composite powder, and ceramic-coated metal composite powder with a particle size range of 40-70 μm is selected.

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

[0033](3) The ceramic-coated metal composite powder obtained in step (1) is fed into the powder feeder of the spraying equipment, and the plasma spraying equipment is used to spray the coa...

Example Embodiment

[0035]7.9MPa·m1 / 2. Example 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 20g of metallic phase NiCrAl powder with particle size dispersed between 35~55μm and ceramic phase HfB with particle size of 20~40μm2Powder 80g, first put the mixed powder and the grinding ball in a vacuum drying oven at 80℃ for 6h before ball milling. In a high-energy ball mill, protected by argon, the ball mill is at a speed of 130rpm, a total grinding time of 130 minutes and 10: The ball-to-material ratio of 1 is ground to produce coated composite powder, and ceramic-coated metal composite powder with a particle size range of 40-70 μm is selected.

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

[0039](3) The ceramic-coated metal composite powder obtained in step (1) is fed into the powder feeder of the spraying equipment, and the plasma spraying equipment i...

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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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