Preparation method of multi-layer large-gradient hard alloy material easy to weld

A cemented carbide and gradient technology, which is applied in the field of preparation of multi-layer easy-to-weld large gradient cemented carbide materials, can solve problems such as difficult to guarantee the high-temperature strength of cemented carbide/weld, and achieve guaranteed strength, grain refinement, The effect of reducing the overall cost

Active Publication Date: 2018-10-02
SHAANXI SCI TECH UNIV
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  • Abstract
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Problems solved by technology

[0004] The present invention aims at the present situation in the field of research and development of the problem that it is difficult to guarantee the high-tem

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  • Preparation method of multi-layer large-gradient hard alloy material easy to weld

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Example Embodiment

[0021] A kind of preparation method of multi-layer easy-weldable large-gradient cemented carbide material of the present invention, comprises the following steps:

[0022] (1) ① tungsten carbide powder, cobalt powder, ② tungsten carbide powder, nickel powder, ③ tungsten carbide powder, iron powder according to mass ratio (24~26): 1, (0.63~0.67): 1, (0.22~ 0.25): 1 placed in a high-energy ball mill for pre-alloying treatment to obtain three pre-alloyed powders, the ball mill speed is 500-560 rpm, the ball-to-material ratio (4.2-5.6): 1, the ball mill pot and the ball material are both Carbide;

[0023] (2) Add the three kinds of pre-alloyed powders into the forming agent, put them into the cold press mold respectively, and press them in the biaxial cold press. The powder forming agent weight percentages are 2.2%, 1.7% and 1.3%, respectively, the compression force is 270MPa, 220MPa and 200MPa, and the degreasing temperature is 320°C;

[0024] (3) Put the degreased green body i...

Example Embodiment

[0026] Example 1

[0027] (1) Put ① tungsten carbide powder, cobalt powder, ② tungsten carbide powder, nickel powder, ③ tungsten carbide powder, and iron powder in a high-energy ball mill according to the mass ratio of 25:1, 0.64:1, and 0.23:1, respectively, for pre-treatment. Alloying treatment to obtain WC-Co, WC-Ni, WC-Fe pre-alloyed powder, the ball mill speed is 540 rpm, the ball-to-material ratio is 5.1:1, and the ball mill pot and ball are made of cemented carbide;

[0028] (2) Add the three kinds of pre-alloyed powders into the forming agent, put them into the cold press mold respectively, and press them in the biaxial cold press. The powder forming agent weight percentages are 2.2%, 1.7% and 1.3%, respectively, the compression force is 270MPa, 220MPa and 200MPa, and the degreasing temperature is 320°C;

[0029] (3) Put the degreased green body into the combined graphite mold according to the percentage of bonding components, spread nickel powder evenly between the la...

Example Embodiment

[0030] Example 2

[0031] (1) Put ① tungsten carbide powder, cobalt powder, ② tungsten carbide powder, nickel powder, ③ tungsten carbide powder, and iron powder in a high-energy ball mill according to the mass ratio of 26:1, 0.67:1, and 0.25:1, respectively, for pretreatment Alloying treatment to obtain WC-Co, WC-Ni, WC-Fe pre-alloyed powder, the ball mill speed is 550 rpm, the ball-to-material ratio is 5.6:1, and the ball mill pot and ball are made of cemented carbide;

[0032] (2) Add the three kinds of pre-alloyed powders into the forming agent, put them into the cold press mold respectively, and press them in the biaxial cold press. The powder forming agent weight percentages are 2.2%, 1.7% and 1.3%, respectively, the compression force is 270MPa, 220MPa and 200MPa, and the degreasing temperature is 320°C;

[0033] (3) Put the degreased green body into the combined graphite mold according to the percentage of bonding components, spread nickel powder evenly between the laye...

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Abstract

The invention discloses a preparation method of a multi-layer large-gradient hard alloy material easy to weld. The preparation method of the multi-layer large-gradient hard alloy material easy to weldcomprises the steps that pre-alloying is conducted to obtain WC-Co pre-alloyed powder, WC-Ni pre-alloyed powder and WC-Fe pre-alloyed powder; then a forming agent is added to the WC-Co pre-alloyed powder, the WC-Ni pre-alloyed powder and the WC-Fe pre-alloyed powder to conduct compression molding; an obtained green body material is arrayed according to additive components, and nickel powder is spread between different layers; and the green body material is conveyed into a rapid hot-pressing sintering furnace to be sintered, so that the multi-layer large-gradient hard alloy material easy to weld is finally obtained.

Description

technical field [0001] The invention relates to the technical field of alloy preparation, in particular to a method for preparing a multilayer easy-to-weld large-gradient cemented carbide material. Background technique [0002] The poor weldability of WC-Co-based cemented carbide materials and steel materials restricts its promotion in stamping dies, cutting tools and other fields. The traditional brazing method is difficult to guarantee the high-temperature strength of the weld, and the mechanical installation weakens the overall strength of the material. Therefore, it is very important to develop a new method for improving the weldability of cemented carbide and steel. [0003] Through reasonable structure and component design, without weakening the strength of cemented carbide tools, improving the weldability of cemented carbide and steel is the key means to improve the high temperature strength of welds. Contents of the invention [0004] The invention aims at the pr...

Claims

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Application Information

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IPC IPC(8): B22F7/02C22C29/08C22C1/05B22F9/04B22F3/02B22F3/14
CPCB22F3/02B22F3/14B22F7/02B22F9/04B22F2003/145B22F2009/041B22F2998/10C22C1/051C22C29/067C22C29/08
Inventor 董洪峰李文虎艾桃桃解念锁
Owner SHAANXI SCI TECH UNIV
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