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Preparation method for high-density pure tungsten, pure molybdenum, tungsten alloy material and molybdenum alloy material

An alloy material and alloy technology, which is applied in the preparation of pure molybdenum and its alloy materials, high-density pure tungsten, and high-density refractory metals, can solve the problems of high cost and single shape, and achieve cost reduction and compensation single shape effect

Active Publication Date: 2016-06-01
安泰天龙钨钼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantage is that it can only produce products with a single shape, such as rods, plates or smaller sizes
If it is required to produce a high-density product with a relatively complex shape or a medium-sized three-dimensional size, it cannot be obtained through deformation processing, or it will incur a huge cost

Method used

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  • Preparation method for high-density pure tungsten, pure molybdenum, tungsten alloy material and molybdenum alloy material
  • Preparation method for high-density pure tungsten, pure molybdenum, tungsten alloy material and molybdenum alloy material
  • Preparation method for high-density pure tungsten, pure molybdenum, tungsten alloy material and molybdenum alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, a pure tungsten crucible with a relative density of 98.5% is prepared. The outer dimension of the tungsten crucible is Φ138×140, and the wall thickness is 5mm, such as figure 1 As shown, the specific steps are as follows:

[0036] (1) The tungsten powder (average particle size is 2.5μm) is crushed with a jet crusher, the charging speed is 1.0kg / min, the air pressure is 0.8MPa, the speed of the classifier is 60Hz, and the average particle size of the crushed tungsten powder is 2.3 μm.

[0037] (2) Pack the crushed tungsten powder into a cold isostatic pressing mold and carry out cold isostatic pressing to obtain a billet; the pressure of cold isostatic pressing is 240MPa, the holding time is 20min, and the pressure release rate is 4MPa / min.

[0038] (3) The blank obtained in (2) is sintered in a medium frequency induction heating furnace; the sintering is carried out under a hydrogen atmosphere, and the hydrogen flow rate is 15m 3 / hour, the sinterin...

Embodiment 2

[0041] This example prepares a pure molybdenum crucible with a relative density of 99%. The outer dimensions of the molybdenum crucible are Φ145×110, and the wall thickness is 10 mm, such as figure 2 As shown, the specific steps are as follows:

[0042] (1) Molybdenum powder (average particle size is 3.5μm) is crushed with a jet crusher, the charging speed is 0.5kg / min, the air pressure is 1.2MPa, the classifier speed is 30Hz, and the average particle size of the molybdenum powder after crushing is 3.3 μm.

[0043] (2) Put the crushed molybdenum powder into a cold isostatic pressing mold and carry out cold isostatic pressing to obtain a billet; the pressure of cold isostatic pressing is 220MPa, the holding time is 20min, and the pressure release rate is 3.5MPa / min.

[0044] (3) The blank obtained in (2) is sintered in a medium frequency induction heating furnace; the sintering is carried out under a hydrogen atmosphere, and the hydrogen flow rate is 12m 3 / hour, the sint...

Embodiment 3

[0047] This example prepares a tungsten-lanthanum oxide alloy crucible with a relative density of 99%. The crucible has an overall size of Φ145×110 and a wall thickness of 15mm, such as image 3 As shown, the specific steps are as follows:

[0048] (1) the tungsten-lanthanum oxide powder (average particle size is 2.3 μm, the mass percentage of lanthanum oxide is 1%, adopts the mixing machine to mix and forms), carries out crushing with jet crusher, and charging speed is 0.8kg / min, The air pressure is 0.6MPa, the speed of the classifier is 20Hz, and the average particle size of the crushed alloy powder is 2.0μm.

[0049] (2) Pack the alloy powder after crushing into the cold isostatic pressing mold and carry out the cold isostatic pressing process, thereby obtain the billet; min.

[0050] (3) The blank obtained in (2) is sintered in a medium frequency induction heating furnace; the sintering is carried out under a hydrogen atmosphere, and the hydrogen flow rate is 15m 3 / hou...

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Abstract

The invention provides a preparation method for high-density pure tungsten, pure molybdenum and a tungsten alloy material and a molybdenum alloy material. The method comprises the main steps that firstly, raw material powder is crushed, and crushed powder is obtained; secondly, the crushed powder obtained in the first step is subjected to molding, and blanks are obtained; and thirdly, the blanks obtained in the second step are sintered, and the high-density pure tungsten, pure molybdenum and tungsten alloy material and molybdenum alloy material are obtained. The density of the high-density pure tungsten, pure molybdenum and tungsten alloy material and molybdenum alloy material is 98% or above. The hardness, tensile strength, corrosion resisting capacity, machining performance, hot-working performance and other performance of a product in a sintered state can be effectively improved by improving the density of the blanks in the sintered state. The method is suitable for pure tungsten, pure molybdenum, tungsten-lanthanum oxide alloy, tungsten-cerium oxide alloy, tungsten-thorium oxide alloy and other powder metallurgy products.

Description

technical field [0001] The invention relates to a technology for preparing high-density refractory metals, in particular to a method for preparing high-density pure tungsten, pure molybdenum and alloy materials thereof, belonging to the field of powder metallurgy. Background technique [0002] Tungsten, molybdenum and their alloys, with their advantages of high melting point, high density, good thermal and electrical conductivity, low thermal expansion coefficient, high temperature deformation resistance and good wear resistance, make them the best choice for high temperature, strong radiation and other occasions. The preferred material is widely used in electronics, electric power, national defense industry, kiln thermal field heating and structural parts. [0003] However, the above excellent properties of tungsten, molybdenum and their alloy materials have a great relationship with their density. When the density of tungsten, molybdenum and their alloys is above 95%, if ...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F3/04B22F3/10B22F5/10
CPCB22F3/04B22F3/10B22F5/10B22F9/04B22F2009/044B22F2998/10
Inventor 苏国平杨义兵钟铭张晓金韩蕊蕊
Owner 安泰天龙钨钼科技有限公司
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