Preparation method of cell structure gradient tungsten alloy material

A technology of structural gradient and tungsten alloy, which is applied in the field of preparation of cell structure gradient tungsten alloy materials, can solve the problems of changing the toughness phase composition and limited effect, so as to improve alloy performance, inhibit grain growth, and prevent sintering deformation Effect

Active Publication Date: 2018-11-13
SHAANXI SCI TECH UNIV
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Problems solved by technology

The usual methods of powder ultra-fine, changing the toughness phase composition, and

Method used

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  • Preparation method of cell structure gradient tungsten alloy material

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preparation example Construction

[0021] A kind of preparation method of cell structure gradient tungsten alloy material of the present invention comprises the following steps:

[0022] (1) According to the mass percentage of each component ratio in high tungsten, it is 98.3~99.0%W, 0.6~1.3%Ni and 0.4~0.9%Mn; the mass percentage of each component ratio in low tungsten is 88.4~90.1%W, 6.0-7.7% Ni, 3.9-5.6% Mn, weigh tungsten powder, nickel powder and manganese powder, place them in a high-energy ball mill respectively, and perform pre-alloying treatment to obtain two pre-alloyed powders. The speed of the ball mill is 520-710 rpm , Ratio of ball to material (3.6~5.2): 1, ball milling time 25~40 hours, ball milling tank and balls are made of cemented carbide.

[0023] (2) The high tungsten pre-alloy powder is subjected to atomization drying and granulation. The atomizer rotation speed of the atomization drying granulator is 21000-23000 rpm, and the air inlet / outlet temperatures are 190°C and 60°C respectively. T...

Embodiment 1

[0028] (1) Weigh tungsten powder, Nickel powder and manganese powder are respectively placed in a high-energy ball mill for pre-alloying treatment to obtain two pre-alloyed powders. The ball mill speed is 590 rpm, the ball-to-material ratio is 4.1:1, and the ball milling time is 25 hours. The ball mill pot and ball material All are cemented carbide.

[0029] (2) The high tungsten pre-alloy powder is subjected to atomization drying and granulation, the atomizer rotation speed of the atomization drying granulator is 21000 rpm, the air inlet / outlet temperature is 190°C and 60°C respectively, and the particle size of the dry powder is 70 μm; The prepared high tungsten-based spherical powder and low tungsten-based pre-alloyed powder are placed in an inert atmosphere slow-speed mixer and stirred evenly at a mass ratio of 7.2:1. The slow-speed mixer rotor speed is 20 rpm, and the stirring time is 50 minutes.

[0030] (3) Add 2% SBS forming agent into the mixed powder, put it into a ...

Embodiment 2

[0033] (1) Weigh tungsten powder, Nickel powder and manganese powder are respectively placed in a high-energy ball mill for pre-alloying treatment to obtain two pre-alloyed powders. The ball mill speed is 610 rpm, the ball-to-material ratio is 3.6:1, and the ball milling time is 35 hours. The ball mill pot and ball material All are cemented carbide.

[0034] (2) The high tungsten pre-alloy powder is subjected to atomization drying and granulation. The atomizer speed of the atomization drying granulator is 23000 rpm, the temperature of the air inlet / outlet is 190°C and 60°C respectively, and the particle size of the dry powder is 72 μm; The prepared high tungsten-based spherical powder and low tungsten-based pre-alloyed powder are placed in an inert atmosphere slow-speed mixer and stirred evenly at a mass ratio of 7.4:1. The slow-speed mixer rotor speed is 20 rpm, and the stirring time is 50 minutes.

[0035] (3) Add 2% SBS forming agent into the mixed powder, put it into a co...

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Abstract

The invention discloses a preparation method of a cell structure gradient tungsten alloy material. The preparation method comprises the following steps that high-tungsten base prealloy powder and low-tungsten base prealloy powder are obtained through prealloying treatment in advance, after the high-tungsten base prealloy powder is atomized and pelletized and is uniformly mixed with the low-tungsten base prealloy powder, compression forming is carried out in a cold isostatic pressing machine, two-step sintering is carried out in a high-temperature vacuum tube type furnace, and finally the cellstructure gradient tungsten alloy material is obtained.

Description

technical field [0001] The invention relates to the technical field of high-density alloy preparation, in particular to a preparation method of a cell structure gradient tungsten alloy material. Background technique [0002] The contradiction between strength and toughness is one of the key issues restricting tungsten alloy materials. The usual methods such as ultra-fine powder, changing the toughness phase composition, and plastic processing have limited effects on improving the toughness of tungsten alloys. Therefore, it is very important to develop a new method for improving the strength and toughness of tungsten alloys. [0003] Through the key microstructure design and control of the forming process, giving full play to the dual advantages of the strength of the tungsten component and the toughness of the bonding component is a key means to solve the problem of the contradiction between the strength and toughness of the tungsten alloy. Contents of the invention [0...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C27/04B22F3/16
CPCB22F3/16B22F2207/01C22C1/045C22C27/04
Inventor 董洪峰
Owner SHAANXI SCI TECH UNIV
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