Preparation method of rare earth microalloyed high-density high-strength tungsten-nickel-copper alloy

A micro-alloying and copper alloy technology, applied in the field of tungsten alloy materials, can solve the problems of restricting the microstructure and mechanical properties of tungsten-nickel-copper alloys, alloy powder segregation, and difficulty in particle size control, etc. High uniformity and composition control accuracy

Inactive Publication Date: 2015-05-27
SHAANXI UNIV OF TECH
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Problems solved by technology

[0003] In recent years, many scholars have focused on the preparation and modification of raw material powders for the structure and performance enhancement of tungsten-nickel-copper alloys. The preparation and modification methods of tungsten-nickel-copper alloy powders mainly include atomization water cooling, high-energy ball milling and oxide reduction. , the prepared alloy powder still has problems such as segregation, inclusions, and difficult particle size control, which greatly restricts the further improvement of the microstructure and mechanical properties of tungsten-nickel-copper alloy.

Method used

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  • Preparation method of rare earth microalloyed high-density high-strength tungsten-nickel-copper alloy

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[0024] The preparation method of the rare earth microalloyed high-density and high-strength tungsten-nickel-copper alloy according to the embodiment of the present invention, the specific steps are as follows:

[0025] (1) Weigh tungsten nitrate, nickel nitrate, copper nitrate, yttrium nitrate and water according to the molar ratio of 52~53.4: 1.5~4.8: 1.2~2.5: 0.11~0.34: 2500~3000, and make a mixed solution;

[0026] (2) under the condition of 25~40 DEG C, the ammonia solution mixed with the obtained mixed solution and the concentration of 14.56~15.12mol / L is made into an alkaline solution, and the volume ratio of the used ammonia solution to the mixed solution obtained in step (1) is 3:1, the obtained alkaline solution is stirred, crystallized, filtered, washed and dried to obtain the precursor powder;

[0027] (3) Putting the precursor powder into a reducing atmosphere furnace for dissociation and reduction treatment to obtain tungsten-nickel-copper alloy powder containing ...

Embodiment 1

[0038] First, weigh tungsten nitrate (WNO 3 2H 2 O), nickel nitrate (Ni(NO 3 )2·6H 2 O), copper nitrate (Cu(NO 3 )2·6H 2 O) and yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O), the concrete consumption of the raw material that takes by weighing is: tungsten nitrate (WNO 3 2H 2 O) is 146.5g, nickel nitrate (Ni(NO3) 2 6H2O) is 12.8g, copper nitrate (Cu(NO3)2 6H2O) is 7.4g, yttrium nitrate (Y(NO 3 ) 3 ·6H 2 (2) is 0.42g, measures 450ml of distilled water with a graduated cylinder, adds the raw materials weighed and the distilled water measured into a beaker and stirs and dissolves to obtain a mixed solution. At 30°C, add ammonia solution with a concentration of 14.56mol / L to the mixed solution in a dropwise manner, the volume ratio of ammonia water / mixed solution is 3:1, and stir and crystallize at 59°C for 18 hours. Filtration and vacuum drying at 150°C to obtain precursor powder;

[0039] Take out the precursor powder, dissociate and reduce it in a carbon atmosphere rotary f...

Embodiment 2

[0043] First, weigh tungsten nitrate (WNO 3 2H 2 O), nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), copper nitrate (Cu(NO 3 ) 2 ·6H 2 O) and yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O), the concrete consumption of the raw material that takes by weighing is: tungsten nitrate (WNO 3 2H 2 O) is 148.8g, nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) is 7.86g, copper nitrate (Cu(NO 3 ) 2 ·6H 2 O) is 5.03g, yttrium nitrate (Y(NO 3 ) 3 ·6H 2 (2) is 0.84g, measures 500ml of distilled water with graduated cylinder, adds the raw material that takes by weighing and the distilled water that measures and stirs and dissolves in the beaker, obtains mixed solution. At 34°C, add the ammonia solution with a concentration of 14.88 mol / L to the mixed solution in a dropwise manner, the volume ratio of ammonia water / mixed solution is 3:1, and stir and crystallize at 62°C for 21 hours. Filtration and vacuum drying at 150°C to obtain precursor powder;

[0044] Take out the precursor powder, dissociate and...

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Abstract

The invention relates to a preparation method of a rare earth microalloyed high-density high-strength tungsten-nickel-copper alloy. The preparation method comprises the following steps: firstly, preparing tungsten nitrate, nickel nitrate, copper nitrate, yttrium nitrate and water into a mixed solution according to a preset metering ratio, then preparing an alkali solution together with certain concentration of ammonia water solution, stirring the alkali solution, crystallizing, filtering, washing and drying to obtain precursor powder; placing the precursor powder into a reducing atmosphere furnace for dissociating and reducing, to obtain yttrium-containing tungsten-nickel-copper alloy powder; and grinding the alloy powder and mixing together with a forming agent and press-forming, dewaxing the formed blank and performing high-temperature sintering to finally obtain the rare earth microalloyed high-density high-strength tungsten-nickel-copper alloy. The tungsten-nickel-copper alloy prepared by taking the rare earth microalloyed tungsten-nickel-copper alloy powder prepared by adopting a liquid/liquid doping method as a raw material through a proper powder metallurgy technology has the advantages that the density is more than or equal to 18.1g/cm<3>, the tensile strength is more than or equal to 850MPa, and the yielding strength is more than or equal to 690MPa.

Description

technical field [0001] The invention relates to the technical field of tungsten alloy materials, in particular to a preparation method of rare earth micro-alloyed high-density and high-strength tungsten-nickel-copper alloy. Background technique [0002] As a functional material, tungsten-based alloys are widely used in aerospace, energy and power, national defense and nuclear industries, etc., to manufacture gyroscope rotors, rocket nozzles, armor-piercing projectile cores, high-voltage electrical switch contacts, etc. Since the elastic modulus of tungsten-based alloy material is much larger than that of steel material, it can be used to manufacture grinding rods for internal thread grinding machines to reduce the elastic deformation of grinding rods during the grinding process and ensure the processing accuracy and efficiency of internal threads. However, compared with structural steel, common tungsten-based alloys have low strength and high brittleness, which cannot meet t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04B22F9/24
Inventor 郭从盛董洪峰邵先钊辛思彧景然
Owner SHAANXI UNIV OF TECH
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