A kind of potassium zirconium carbide co-doped tungsten alloy and preparation method thereof

A zirconium carbide and co-doping technology, applied in the field of plasma wall materials, can solve the problems of poor plasma etching resistance of potassium-doped tungsten, low strength and toughness of bulk products, and achieve improved plasma etching resistance. corrosion resistance, excellent strength and high temperature stability, and the effect of improving low temperature toughness

Active Publication Date: 2019-11-05
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium-doped tungsten mainly uses nano-sized potassium bubbles formed in tungsten by trace amounts of potassium in the alloy to pin dislocations and grain boundaries to strengthen tungsten alloys. Potassium-doped tungsten has high strength, high thermal conductivity, high recrystallization, etc. Advantages, such as filaments have been widely used in the field of lighting, and it has also attracted widespread attention in the application of fusion reactor facing plasma wall materials, but potassium-doped tungsten has weak resistance to plasma etching, and usually requires a large amount of deformation Thermoplastic processing can obtain high strength and high temperature performance, and the strength and toughness of bulk products are low

Method used

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  • A kind of potassium zirconium carbide co-doped tungsten alloy and preparation method thereof
  • A kind of potassium zirconium carbide co-doped tungsten alloy and preparation method thereof
  • A kind of potassium zirconium carbide co-doped tungsten alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] The specific steps for the preparation of potassium zirconium carbide co-doped tungsten alloy are as follows:

[0039] Step 1: Put potassium-doped tungsten powder and ZrC powder in the ratio of 99.5% by weight: 0.5% by ball milling in an argon atmosphere and mix them evenly to obtain a mixed powder, wherein K and Al in the potassium-doped tungsten powder , Si weight percentages are 0.011%, 0.004%, 0.022%, O content is 0.25%, the average particle size of potassium-doped tungsten powder is about 3.3 microns, and the average particle size of ZrC powder is 50nm.

[0040] Step 2: First put the mixture in the mold sleeve, press it into a green body with a cold isostatic press at a pressure of 200MPa, then place the green body in a dry flowing hydrogen atmosphere and sinter at 2000°C for 4 hours to obtain a relatively dense Alloy bulk forming.

[0041] Step 3: Hot rolling the sintered alloy block at 1000-1700°C for multiple passes, the deformation of each pass is 10-15%, and ...

Embodiment 2

[0049] The concrete steps of preparation are:

[0050] Step 1: According to the ratio of 98.5% by weight: 1.5%, ball mill and mix the doped tungsten powder and ZrC powder evenly in an argon atmosphere, wherein the doped tungsten powder contains K: 0.006%, Al: 0.01% , Si: 0.035%, O is less than or equal to 0.2% doped tungsten powder as the raw material, the particle size of the doped tungsten powder is 5.0μm, the particle size of the ZrC powder is about 100nm, and the V-type powder is used in an argon atmosphere. Blend with a mixer to obtain a homogeneous mixture.

[0051] Step 2: first put the mixture into a steel mold, and press it into a green body with a cold press at 300MPa, then place the green body in a hydrogen atmosphere or vacuum, and sinter it at 2300°C.

[0052] Step 2 can also adopt the direct thermocompression molding process, as follows:

[0053] The mixture is placed in a hydrogen atmosphere or a vacuum atmosphere, and is hot isostatically pressed and sintered...

Embodiment 3

[0058] The concrete steps of preparation are:

[0059] Step 1: According to the ratio of 99.8% by weight: 0.2%, the doped tungsten powder and ZrC powder are uniformly mixed with a mixer in an argon atmosphere to obtain a mixture, wherein the doped tungsten powder contains K : 0.02%, Al: 0.005%, Si: 0.025%, O less than or equal to 0.3%, the particle size of the doped tungsten powder is 1 μm, and the average particle size of the ZrC powder is 50 nm.

[0060] Step 2: First press the mixture under a pressure of 400MPa to form a green body, then place the green body in a flowing dry hydrogen atmosphere, and sinter at 2200°C for 5 hours to obtain a fairly dense alloy block.

[0061] Step 3: Rotate the sintered alloy block at 1100-1600°C, the initial forging temperature is 1500-1600°C, the terminal temperature is 1100-1300°C, the deformation amount per pass is about 10%, and the deformation amount is about 60 %, obtain dense tungsten alloy bulk.

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Abstract

The invention discloses a potassium zirconium carbide co-doped tungsten alloy and a preparation method thereof. The tungsten alloy is composed of K, Al, Si, ZrC and W, and the K content is 0.003-0.03% and the ZrC content is 0.1% in weight percentage. ~1.5%, the total content of Al and Si alloy elements is less than or equal to 0.05%, the W content is 98.4~99.85%, and the rest are impurities. The tungsten alloy of the invention has excellent low temperature toughness, high temperature strength and high temperature stability, and has obvious plasticity at 150°C; the strength is much higher than that of potassium-doped tungsten and pure tungsten, and also significantly higher than that of tungsten-zirconium carbide alloy; After annealing at ℃ for 1 hour, the strength of the tungsten alloy of the present invention at 500 ℃ is more than 40% higher than that of potassium-doped tungsten and tungsten-zirconium carbide alloys under the same conditions. The plasma etching resistance of the invention is similar to that of tungsten-zirconium carbide alloy, but better than potassium-doped tungsten and pure tungsten.

Description

technical field [0001] The invention belongs to the field of fusion reactor facing plasma wall materials, in particular to a potassium zirconium carbide co-doped tungsten alloy, and also relates to a preparation method of the tungsten alloy. Background technique [0002] The plasma-facing wall materials in nuclear fusion reactors need to serve under extremely harsh conditions such as high temperature, high thermal load shock, and high-energy particle bombardment, which is the key to the development of fusion energy. Due to its high melting point, high strength, low thermal expansion coefficient, high thermal conductivity, anti-sputtering, and low deuterium-tritium retention, metal tungsten is considered to be one of the most promising candidate wall materials for fusion reactors facing the plasma wall. However, tungsten has shortcomings such as room temperature brittleness (the ductile-brittle transition temperature of commercial pure tungsten is about 400°C), recrystallizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/05C22C1/10
CPCC22C1/05C22C27/04C22C32/0052
Inventor 刘瑞姚雄谢卓明方前锋张涛王先平刘长松
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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