Method for preparing high-tungsten-content tungsten-zirconium alloy

A technology of tungsten-zirconium content, which is applied in the field of preparation of high-tungsten-content tungsten-zirconium alloys. It can solve the problems of demanding alloy properties, tungsten component settlement, and less element diffusion, so as to improve the density, strength and toughness, and improve the distribution state. , The effect of high electrode strength

Active Publication Date: 2015-12-23
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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Problems solved by technology

[0003] There are two main methods for the preparation of tungsten-zirconium alloys: (1) powder metallurgy process: powder metallurgy can prepare alloy materials with high tungsten content. This process belongs to solid phase sintering in the sintering process, and the diffusion between elements is less. The degree of alloying is not high, it is difficult to achieve absolute density
For some special fields, the alloy performance requirements are very strict, and the tungsten-zirconium alloy prepared by powder metallurgy cannot meet the design requirements from the perspective of density and toughness.
(2) Vacuum smelting method: Vacuum smelting can prepare alloys with higher material properties and obtain smelted alloy materials, but due to the limitation of non-consumable arc melting temperature, it is more difficult to smelt tungsten-zirconium alloys with high tungsten content. Moreover, the density of tungsten element is high, and the phenomenon of tungsten component precipitation is easy to occur in arc melting, so it is difficult to prepare high-tungsten alloy with uniform structure.
[0004] Although the patent No. ZL201110440556.9 (the authorized public number is CN102492863B), the Chinese invention patent "An Arc Melting Method for Tungsten-Zirconium Alloy with High Tungsten Content" discloses the preparation of tungsten with a tungsten content of 40% by non-consumable arc melting. Zirconium alloy, the smelting method of tungsten-zirconium alloy with higher tungsten content has not been reported yet

Method used

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  • Method for preparing high-tungsten-content tungsten-zirconium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of ZrTi-50W alloy

[0026] (1) mix powder, mix powder

[0027] Mix ZrTi powder (zirconium titanium powder) and W powder (tungsten powder) with 50% (mass percentage) each, mix evenly with a mixing tank, and mix the powder for 2 hours. After mixing the powder, add 5% SBP glue and granulate .

[0028] In this example, ZrTi powder is produced by gas atomization of zirconium-titanium alloy rods. The zirconium content in the zirconium-titanium alloy is 40-60%, the particle size of ZrTi powder is 100-150 μm, and the particle size of W powder is 3-5 μm. Example 2 It is the same as that of Embodiment 3, and will not be repeated here.

[0029] (2) Pressing and sintering

[0030] Pressing with a cold isostatic press at 220MPa, keeping the pressure for 2 minutes, and releasing the pressure in stages, the green compact was obtained; the green compact was degreased at 600°C for 2 hours, sintered at 1300°C, and kept for 1.5 hours; Cylindrical electro...

Embodiment 2

[0039] Embodiment 2: the preparation of ZrTi-60W alloy

[0040] (1) mix powder, mix powder

[0041] Mix 40% ZrTi powder and 60% W powder (mass percentage), mix evenly with a mixing tank, and the mixing time is 2 hours. After mixing, add 5% SBP glue and granulate.

[0042] (2) Pressing and sintering

[0043] Pressed with a cold isostatic press at 220MPa, kept the pressure for 2 minutes, and released the pressure in stages to obtain a compact; degrease the compact at 600°C for 2h, sinter at 1300°C, and keep it warm for 1.5h; Cylindrical electrode, using the electrode as a consumable electrode for consumable arc melting.

[0044] (3) Consumable arc melting

[0045] The vacuum degree of consumable arc melting is 10 -1 Above Pa, the melting voltage is 26V, after a consumable arc melting: the melting current is 1-1.25KA, the arc-stabilizing current is 1.8-2.5A, the melting time is 2-3min, cooled to below 150°C and released from the furnace. Obtain the high tungsten content tun...

Embodiment 3

[0047] Embodiment 3: the preparation of ZrTi-70W alloy

[0048] (1) mix powder, mix powder

[0049] Mix 30% ZrTi powder and 70% W powder (mass percentage), mix evenly with a mixing tank for 2.5 hours, add 5% SBP glue and granulate.

[0050] (2) Pressing and sintering

[0051] Use a cold isostatic press at 200MPa to press, keep the pressure for 3 minutes, and release the pressure in stages to obtain a compact; degrease the compact at 600°C for 2h, sinter at 1300°C, and keep it warm for 1.5h; Cylindrical electrode, using the electrode as a consumable electrode for consumable arc melting.

[0052] (3) Consumable arc melting

[0053] The vacuum degree of consumable arc melting is 10 -1 Above Pa, the melting voltage is 24V, after a consumable arc melting: melting current 1-1.25KA, arc-stabilizing current 1.8-2.5A, melting time 2-3min, cool to below 150°C and take out the furnace. Obtain the high tungsten content tungsten-zirconium alloy (being ZrTi-70W primary ingot) that the p...

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Abstract

The invention relates to a method for preparing high-tungsten-content tungsten-zirconium alloy. The method comprises the following steps that (1) powder is prepared and mixed, tungsten powder and zirconium-titanium powder are mixed and then pelletized, and the proportion, by weight, of the added tungsten powder is 50%-70%; (2) pressing and sintering are carried out, pressing is carried out through a cold isostatic pressing molding press, and pressure is relieved in a graded mode; degreasing sintering is carried out through a high-vacuum resistance furnace, peeling is carried out through finish turning, and a consumable electrode is obtained; and (3) consumable electric arc melting is carried out for at least one time to obtain the high-tungsten-content tungsten-zirconium alloy with uniform ingredients. The consumable electrode is prepared through powder metallurgy, the strength of the electrode is high, and the phenomenon of slag falling is avoided in smelting; the distribution state of tungsten and other elements in the electrode is well improved through powder sintering, the uniformity of ingredients and the structure of cast ingots is facilitated, and therefore the smelted-state tungsten-zirconium alloy with the tungsten content reaching up to 70% is obtained. In addition, through the consumable smelting process, the alloy can be purified, inclusions are eliminated, and the density and the toughness of the alloy are further improved compared with powder-metallurgy-state alloy.

Description

technical field [0001] The invention relates to the field of alloy preparation, in particular to a method for preparing a tungsten-zirconium alloy with high tungsten content. Background technique [0002] Tungsten is a very important non-ferrous metal. It has a series of characteristics such as high density and high strength. It is usually used as counterweight material, shielding material and military warhead material. It is used in medical treatment, engineering machinery, hardware tools, military, aerospace Wide range of applications. Tungsten-zirconium alloy is a typical energetic structural material. This type of material is quite stable at room temperature and has high strength. The reaction releases a large amount of heat. The tungsten-zirconium alloy fragments made of this characteristic can use its strength to penetrate through the target, and can use its release characteristics to generate additional damage to the target, and finally significantly improve the dam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C27/04
Inventor 刘桂涛刘凯梁栋葛文艳王志威李德林陈敏焦治华张徐镜
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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