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Preparation method of hard alloy and hard alloy prepared through method

A cemented carbide and alloy powder technology, applied in the field of alloy materials, can solve the problems affecting the normal progress of the project, the cemented carbide is prone to wear and tear, and cannot meet the development needs, etc., and achieves the effect of reducing the introduction of impurities and improving the purity.

Active Publication Date: 2021-09-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the continuous development of industry, people have higher and higher requirements on the performance of cemented carbide. Although traditional cemented carbide has good mechanical properties, it has gradually failed to meet the needs of industrial development, and cemented carbide is easy to use during use. Abrasion and breakage occur, which greatly affect the normal progress of the entire project

Method used

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  • Preparation method of hard alloy and hard alloy prepared through method
  • Preparation method of hard alloy and hard alloy prepared through method
  • Preparation method of hard alloy and hard alloy prepared through method

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preparation example Construction

[0027] see figure 1 , figure 1 It is a flowchart of the preparation method of cemented carbide of the present invention. The preparation method of the present invention at least comprises the following steps:

[0028] S1, using Y(NO 3 ) 3 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 Precursor powder prepared from O and WC-Co alloy powder;

[0029] S2. Calcining the precursor powder in a hydrogen atmosphere, cooling and grinding to obtain WC-Co-Y 2 o 3 -Mo mixed powder;

[0030] S3, the WC-Co-Y 2 o 3 -Mo mixed powder sintered to prepare WC-Co-Y 2 o 3 - Mo cemented carbide.

[0031] see figure 2 , figure 2 for figure 1 The flow chart of preparing the precursor powder in step S1 specifically includes the following steps:

[0032] S11, set Y(NO 3 ) 3 ·6H 2 O and (NH 4 ) 6 Mo 7 o 24 4H 2 O dissolved in deionized water;

[0033] S12. Add WC-Co powder into the above solution, and stir at 120-140° C. until the water in the solution is evaporated to dryness;

[00...

Embodiment 1

[0054] WC-Co-Y prepared in this example 2 o 3 -Y in Mo cemented carbide 2 o 3 0.8 wt%, Mo 2.7 wt%, and WC-Co 96.5 wt%.

[0055] The preparation process is as follows: first according to the Y in the cemented carbide 2 o 3 The content of , Mo and WC-Co is calculated according to formula (1) and formula (2) Y(NO 3 ) 3 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 The amount of O and WC-Co should be weighed according to the calculated amount.

[0056] 1. Preparing the precursor: the weighed Y(NO 3 ) 3 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O and C 16 h 22 N 4 o 3 Add it into a beaker filled with deionized water, place it in a constant temperature water bath at 50°C and stir until the solids are completely dissolved, and continue stirring until the solution is colorless; then add the weighed WC-Co powder and magnetic rotor into the beaker, and then add The beaker was heated in a magnetic stirrer, and the heating temperature was set to 120°C. After the water in the solution...

Embodiment 2

[0061] WC-Co-Y prepared in this example 2 o 3 -Y in Mo cemented carbide 2 o 3 1.0 wt%, Mo 3.5 wt%, and WC-Co 95.5 wt%.

[0062] The preparation process is as follows: first according to the Y in the cemented carbide 2 o 3 The content of , Mo and WC-Co is calculated according to formula (1) and formula (2) Y(NO 3 ) 3 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 The amount of O and WC-Co should be weighed according to the calculated amount.

[0063] 1. Preparing the precursor: the weighed Y(NO 3 ) 3 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O and C 16 h 22 N 4 o 3 Add it into a beaker filled with deionized water, place it in a constant temperature water bath at 50°C and stir until the solids are completely dissolved, and continue stirring until the solution is colorless; then add the weighed WC-Co powder and magnetic rotor into the beaker, and then add The beaker was heated in a magnetic stirrer, and the heating temperature was set at 130°C. After the water in the solution...

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Abstract

The invention provides a preparation method of a hard alloy and the hard alloy prepared through the method. The preparation method comprises the following steps that precursor powder is prepared through yttrium nitrate, ammonium heptamolybdate and WC-Co powder; the precursor powder is calcined in a hydrogen atmosphere, the precursor powder is cooled, and the precursor powder is ground to obtain WC-Co-Y2O3-Mo mixed powder; and the WC-Co-Y2O3-Mo mixed powder is sintered, and the WC-Co-Y2O3-Mo hard alloy is prepared. According to the hard alloy prepared through the preparation method, a Y2O3 phase and a Mo phase are evenly distributed on WC-Co, tungsten carbide grains can be refined through the dispersion strengthening effect of Y2O3 and Mo, the hardness and fracture toughness of the hard alloy are improved, and the hard alloy has the good comprehensive mechanical property.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a method for preparing hard alloy and the hard alloy prepared by the method. Background technique [0002] Cemented carbide is based on one or more refractory metal compounds (WC, MoC, TaC, TiC, NbC, etc.) with high hardness and high elastic modulus, and transition metals (Co, Zr, Ni, Fe, etc.) Or alloy as a binder, usually multi-phase composite materials prepared by powder metallurgy method, is one of the most typical and important material products in the field of powder metallurgy. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500°C , It still has high hardness at 1000 °C. Therefore, cemented carbide has been widely used in metal cutting, metal...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08B22F3/105B22F9/22B22F9/30
CPCC22C1/056C22C29/08B22F9/22B22F9/30B22F3/105
Inventor 秦永强袁健吴玉程罗来马
Owner HEFEI UNIV OF TECH
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