Preparation method of ultra-fine grain binding-phase-free hard alloy

A binder-free, cemented carbide technology, applied in the field of cemented carbide, can solve problems such as grain growth

Active Publication Date: 2022-01-07
XIAMEN TUNGSTEN +1
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  • Claims
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Problems solved by technology

[0006] The invention provides a method for preparing ultrafine-grained cemented carbide without binder phase to solve the problems caused by excessive local oxygen cont

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  • Preparation method of ultra-fine grain binding-phase-free hard alloy
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  • Preparation method of ultra-fine grain binding-phase-free hard alloy

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preparation example Construction

[0052] The invention provides a method for preparing ultrafine-grain cemented carbide without a binder phase, the preparation method comprising:

[0053] Weigh the raw material powder according to the composition ratio of ultra-fine-grained cemented carbide without binder phase, add carbon powder to the raw material powder to form a mixture, grind and mix the mixture in an inert atmosphere to obtain a mixed powder, and add carbon powder Quantity is C total ;

[0054] Molding the mixed powder to obtain a green body;

[0055] Carry out degreasing treatment and homogenization heat treatment on the green body;

[0056] Carry out oxidation treatment to the green body after homogenization heat treatment;

[0057] Carrying out sintering treatment on the green body after oxidation treatment to obtain ultra-fine grain cemented carbide without binder phase;

[0058] Among them, the amount of carbon powder added C total Calculated by formulas (1) and (2):

[0059] C total =C adju...

Embodiment 1

[0107] This example provides a method for preparing an ultra-fine grain cemented carbide without a binder phase. The composition of the ultrafine grain cemented carbide without a binder phase is shown in Table 1:

[0108] Table 1

[0109]

[0110] in,

[0111] The average particle size of WC powder is 0.1μm, and the theoretical carbon content is 6.1275wt.%.

[0112] The average particle size of Co powder is 0.4μm, and the theoretical carbon content is 0wt.%.

[0113] Cr 3 C 2 The average particle size of the powder is 0.72μm, and the theoretical carbon content is 13.3342wt.%.

[0114] The average particle size of VC powder is 0.8μm, and the theoretical carbon content is 19.0654wt.%.

[0115] According to formula (3), it can be known that the theoretical carbon content C of the alloy theory-total = 6.1901 wt.%.

[0116] This preparation method comprises the steps:

[0117] 1) Determination of the carbon content and oxygen content of the raw material powder, among whi...

Embodiment 2

[0141] The composition and raw material powder of the superfine-grain cemented carbide without binder phase of the present embodiment are the same as that of the embodiment 1, and ΔC is 0.08wt.% in the present embodiment, and the amount of carbon black added is C total It is 0.2978wt.%.

[0142]Accurately weigh each raw material powder and carbon black powder. The average particle size of the carbon black powder is 0.02 μm. In an inert atmosphere, place the raw material powder and carbon black powder in a ball mill, using cemented carbide balls and high Pure absolute ethanol is carried out ball milling, and ball milling time is 54h, and wherein, the mass ratio of cemented carbide ball and raw material powder and carbon black powder is 4:1;

[0143] The molding process is adopted in the first pressing stage, and the pressing pressure is controlled at 0.4t / cm 2 , to obtain a low-density green body, and then adopt cold isostatic pressing in the second pressing stage with a press...

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Abstract

The invention relates to a preparation method of an ultra-fine grain binding-phase-free hard alloy. The preparation method comprises the following steps of weighing raw material powder according to the components of the ultra-fine grain binding-phase-free hard alloy, adding carbon powder into the raw material powder to form a mixture, and grinding and mixing the mixture in an inert atmosphere to obtain mixed powder, wherein the addition amount of the carbon powder is C<total>; carrying out molding treatment on the mixed powder to obtain a green body; performing degreasing treatment and homogenizing heat treatment on the green body; carrying out oxidation treatment on the green body subjected to the homogenizing heat treatment; and sintering the green body obtained after oxidation treatment to obtain the compact ultra-fine grain binding-phase-free hard alloy free of the graphite phase and the decarburization phase. The hard alloy is fine in grain and has good strength, hardness and polishing smoothness.

Description

technical field [0001] The invention relates to the field of hard alloys, in particular to a preparation method of ultrafine-grained hard alloys without a binder phase. Background technique [0002] Ultrafine-grained cemented carbide without binder phase refers to WC-based cemented carbide with a grain size of tungsten carbide ≤ 0.5 μm and a binder phase (Co, Ni and Fe) content of less than 1 wt.%. Due to the extremely low content of binder phase, compared with traditional cemented carbide, ultra-fine-grained cemented carbide without binder phase has excellent wear resistance, oxidation resistance, corrosion resistance and polishability. Therefore, it is widely used in the field of ultra-mirror glass lens molds and wear-resistant fields such as water jet sand tubes. [0003] Due to the extremely low content of binder phase, the sensitivity of the preparation process of ultrafine-grained cemented carbide without binder phase to carbon is multiplied. figure 1 The calculation...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08B22F3/15
CPCC22C1/055C22C29/08C22C29/067B22F3/15
Inventor 张太全罗文远刘超吴松毅郑文庆蔡晓康张有明林亮亮
Owner XIAMEN TUNGSTEN
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