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Low-cobalt high-strength hard alloy and preparation method thereof

A cemented carbide and high-strength technology, which is applied in the field of low-cobalt and high-strength cemented carbide and its preparation, can solve the problems of reducing work efficiency, construction project progress, wear resistance, etc. Good breaking strength and abrasion resistance effect

Pending Publication Date: 2021-10-22
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current market, most of the brands used in some special mines show phenomena such as non-wear resistance, broken teeth, and broken teeth. Due to the high content of cobalt, it has caused certain economic losses and reduced their work to the customers who use the tools. Efficiency and schedule of construction works

Method used

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  • Low-cobalt high-strength hard alloy and preparation method thereof
  • Low-cobalt high-strength hard alloy and preparation method thereof
  • Low-cobalt high-strength hard alloy and preparation method thereof

Examples

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preparation example Construction

[0042] On the other hand, a method for preparing low-cobalt high-strength cemented carbide specifically comprises the following steps:

[0043] Ingredients: put the composite hard phase and binder phase in the above parts by weight into the ball mill cylinder;

[0044] Ball milling: Add hexane or alcohol, paraffin, stearic acid into the ball mill cylinder, cover the ball mill cylinder, start the ball mill, and ball mill for 24-60 hours;

[0045] Preparation of mixed pellets: discharge slurry through filtration, carry out spray drying and granulation of slurry through spray tower to obtain the required mixed pellets for pressing;

[0046] Compression: Press the mixed pellets through a mold and a press to obtain the required semi-finished carbide blank;

[0047] Sintering: put the semi-finished cemented carbide blank into a pressure sintering furnace for high temperature sintering;

[0048] Complete the preparation:

[0049] In some possible implementations, during the pressi...

Embodiment 1

[0053] In this example, the specific proportion of high-strength cemented carbide is: 94 parts of high-temperature reduction and high-temperature carbonized tungsten carbide with a Fibonacci particle size of 3.10 μm to 3.60 μm, 6 parts of cobalt powder, and a total of 100 parts; 2 parts of paraffin, 0.05 part of stearic acid, 400 ml / kg of hexane or alcohol.

[0054] The concrete steps of preparation method are as follows:

[0055] Step 1: Ingredients;

[0056] Weigh tungsten carbide A and cobalt powder with a Fibonacci particle size of 3.10 μm to 3.60 μm and put them into the ball mill cylinder according to the weight ratio, wherein the total carbon of tungsten carbide is adjusted with tungsten powder or carbon black, and the ratio of ingredients to balls is 4 :1.

[0057] Step two: ball milling;

[0058] Add 400 ml / kg of hexane or alcohol, 2 parts of paraffin, and 0.05 part of stearic acid into the ball mill cylinder of the above ingredients. After covering the ball mill c...

Embodiment 2

[0066] Embodiment 2-implementation 4 uses the same raw materials as in embodiment 1, and controls different sintering temperatures and relative cobalt-cobalt magnetic percentages to achieve preparation;

[0067] The difference between embodiment 2-implementation 4 and embodiment 1 is that the sintering temperature and the relative cobalt-cobalt magnetic percentage are different. After the preparation is completed, the green body is sent for inspection. Figure 1-Figure 4 It is the metallographic picture of embodiment 1-embodiment 4 successively, and its physical properties are as such

[0068] Table 1 shows:

[0069]

[0070] Table 1

[0071] As can be seen from the data in Table 1, in Example 1-Example 4, the same tungsten carbide has the same cobalt content, and the mixture made by ball milling has different sintering temperatures and the influence of cobalt magnetism on alloy performance. In the case of non-decarburization, the tungsten in the alloy plays a role of sol...

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Abstract

The invention relates to the technical field of hard alloys, and particularly discloses a low-cobalt high-strength hard alloy, which comprises the following raw materials in parts by weight: 93.5-94.2 parts of a composite hard phase; 5.8 to 6.5 parts of a bonding phase; the bonding phase is cobalt; and the composite hard phase comprises tungsten carbide A with a Fisher particle size of 3.10 [mu] m to 3.60 [mu] m. The preparation method specifically comprises the following steps: material preparation: putting the composite hard phase and the bonding phase in parts by weight into a ball milling barrel; performing ball milling: adding hexane or alcohol, paraffin and stearic acid into the ball milling barrel, covering the ball milling barrel, starting a ball mill, and performing ball milling for 24-60 hours; preparing mixed granules, namely filtering and discharging slurry, and performing spray drying and granulation on the slurry through a spray tower to obtain the mixed granules required by pressing; pressing, specifically, the mixed granules are pressed and formed through a mold and a press machine, and a needed hard alloy semi-finished product blank is prepared; sintering: putting the hard alloy semi-finished product blank into a pressure sintering furnace for high-temperature sintering; and finishing preparation. The low-cobalt high-strength hard alloy provided by the invention has high bending strength and toughness.

Description

technical field [0001] The invention relates to the technical field of cemented carbide binder phase toughening and strengthening, in particular to a low-cobalt high-strength cemented carbide and a preparation method thereof. Background technique [0002] The requirements for cemented carbide materials for high and low wind pressure down-the-hole drilling rigs, drill bits for light rock drills, and drill teeth for full hydraulic drilling vehicles are getting higher and higher. At present, cemented carbides in this application field The requirements for the cobalt content are relatively low, and the cobalt content is about 5.8% to 8.5%. The working conditions of the teeth are also relatively complicated, and they are subjected to impact and rotational wear. In terms of the working force of the teeth, the teeth are subjected to huge shear stress and impact load. Therefore, the cemented carbide material needs to have higher bending resistance. Strength, toughness and high hard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05B22F3/02B22F3/10B22F9/04C22C1/10
CPCC22C29/08C22C29/067C22C1/051B22F9/04B22F3/02B22F3/1007B22F2009/043
Inventor 袁明健
Owner ZIGONG CEMENTED CARBIDE CORP
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