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Preparation method of tungsten carbide-aluminum hard alloy sintering body

A technology of cemented carbide and tungsten carbide, applied in the field of metal materials, can solve the problems of easily forming pores, reducing the performance of sintered bodies, and easily oxidizing cobalt

Inactive Publication Date: 2010-06-23
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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Problems solved by technology

[0004] The disadvantage of this process is that the preparation of tungsten carbide aluminum powder is difficult and the preparation time is long, which results in a long overall reaction time for the preparation of tungsten carbide aluminum cemented carbide sintered body and high production cost; and the sintered body is prepared by hot pressing sintering When the cobalt is under pressure, the fluidity of cobalt increases, so it is easy to cause uneven distribution of cobalt phase and tungsten carbide aluminum phase, thereby reducing the performance of the sintered body. During the sintering process, the vacuum degree is low, and cobalt is easily oxidized. Oxidation cracks appear in the sintered body, and pores are also easy to form in the sintered body, resulting in greater brittleness and lower hardness of the final alloy

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  • Preparation method of tungsten carbide-aluminum hard alloy sintering body

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preparation example Construction

[0021] The embodiment of the present invention discloses a preparation method of tungsten carbide aluminum cemented carbide sintered body, comprising:

[0022] a), uniformly mixing tungsten-aluminum alloy powder, carbon powder and cobalt powder to obtain a powder mixture;

[0023] b) Pressing the powder mixture under a pressure of 400Mpa to 500Mpa to obtain a compact;

[0024] c) Put the compact at a temperature of 1350°C to 1550°C and a vacuum degree of less than 1×10 -3 Sintering under the condition of Pa to obtain tungsten carbide aluminum-cobalt cemented carbide sintered body.

[0025] According to the present invention, there is no special limitation on the preparation method of tungsten aluminum alloy powder. It can be prepared by the method disclosed in Chinese patent CN1328890A. A specific example can be: mix tungsten powder and cobalt powder in proportion and then add them to high-energy ball mill In the tank, sealed under the protection of argon, the tungsten alumi...

Embodiment 1

[0034] 1. Take 28.0gW 0.9 Al 0.1 powder, 2.0g carbon powder and 3.0g cobalt powder, the W 0.9 Al 0.1 Powder, carbon powder and cobalt powder have a particle size of 350 mesh, the W 0.9 Al 0.1 Powder, carbon powder and cobalt powder are wet mixed in a ball mill mixer, and the liquid medium is alcohol.

[0035] 2. Compress the mixed powder under 450 MPa and hold the pressure for 3 minutes to obtain a green compact.

[0036] 3. Put the compact into a graphite mold, and put the mold into a vacuum sintering furnace at 1500°C with a vacuum of 1×10 -4Sintering under the condition of Pa for 60min, after the sintering is completed, the mold is cooled at room temperature, and demolded after cooling to obtain a tungsten carbide aluminum-cobalt cemented carbide sintered body.

[0037] Polish the tungsten carbide aluminum-cobalt cemented carbide sintered body, take a sample test, the relative density is 98%, measure the different positions of the sintered body, the microhardness is 2...

Embodiment 2

[0040] 1. Take 27.6gW 0.75 al 0.25 powder, 2.4g carbon powder and 3.0g cobalt powder, the W 0.75 al 0.25 Powder, carbon powder and cobalt powder have a particle size of 300 mesh, and the W 0.75 al 0.25 Powder, carbon powder and cobalt powder are wet mixed in a ball mill mixer, and the liquid medium is alcohol.

[0041] 2. Compress the mixed powder at 450 MPa and hold the pressure for 3 minutes to obtain a green compact.

[0042] 3. Put the compact into a graphite mold, and put the mold into a vacuum sintering furnace at 1470°C with a vacuum of 1×10 -4 Sintering under the condition of Pa for 80min, after the sintering is completed, the mold is cooled at room temperature, and demolded after cooling to obtain a tungsten carbide aluminum-cobalt cemented carbide sintered body.

[0043] Polish the tungsten carbide aluminum-cobalt cemented carbide sintered body, take a sample test, the relative density is 98%, measure the different positions of the sintered body, the microhardn...

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Abstract

The invention provides a preparation method of a tungsten carbide-aluminum hard alloy sintering body, which comprises the following steps: evenly mixing tungsten-aluminum alloy powder, carbon powder and cobalt powder to obtain a power mixing material; pressing and forming the power mixing material to obtain a pressed blank at a pressure between 400Mpa and 500Mpa; and sintering the pressed blank under the condition that the temperature is between 1,350DEG C and 1,550DEG C and the vacuum degree is less than 1*10<-3>Pa to obtain the tungsten carbide-aluminum hard alloy sintering body. By adopting the method for preparing the tungsten carbide-aluminum hard alloy sintering body, the reaction time is shortened to 2-3 hours and further the cost is reduced; the prepared tungsten carbide-aluminum hard alloy sintering body has relatively-high density up to over 98 percent, wherein a tungsten carbide-aluminum phase and a cobalt phase are evenly distributed; and in addition, the tungsten carbide-aluminum hard alloy sintering body has high microhardness and bending strength.

Description

technical field [0001] The invention relates to metal materials, in particular to a preparation method of a tungsten carbide aluminum hard alloy sintered body. Background technique [0002] Tungsten carbide (WC) is an interstitial compound formed by embedding carbon atoms in the metal lattice of tungsten. Since carbon atoms do not change the structure of the original metal tungsten lattice, tungsten carbide not only has a high melting point and high wear resistance similar to tungsten, but also has a hardness comparable to diamond. However, pure tungsten carbide is very brittle. In order to solve the brittleness problem, some tungsten atoms are replaced by aluminum atoms in the tungsten carbide lattice to produce tungsten carbide aluminum ((WAl)C). Tungsten carbide aluminum has the characteristics of light weight, good ductility and good oxidation resistance of aluminum on the basis of the excellent performance of tungsten carbide, and at the same time solves the problem of...

Claims

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Application Information

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IPC IPC(8): C22C1/05
Inventor 马贤锋刘建伟汤华国赵伟
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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