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Surface-hardened gradient cemented carbide and preparation method thereof

A cemented carbide and alloy technology, applied in the field of surface-hardened gradient cemented carbide and its preparation, can solve the problems of difficult balance, adjustment and limitation of wear resistance and strength, hardness and toughness, etc., and achieve excellent mechanical properties and improve Red hardness, fine grain effect

Inactive Publication Date: 2015-10-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the homogeneity of the composition and structure of traditional WC-Co cemented carbide, it is difficult to balance and adjust the contradiction between various properties (such as wear resistance and strength, hardness and toughness), and the further promotion of its industrial application is limited.

Method used

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  • Surface-hardened gradient cemented carbide and preparation method thereof
  • Surface-hardened gradient cemented carbide and preparation method thereof
  • Surface-hardened gradient cemented carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-33

[0028] Embodiments 1-33 provide a surface-hardened gradient cemented carbide and a preparation method of the surface-hardened gradient cemented carbide.

[0029] The mass percentage of each component of the alloy binder phase used in Examples 1-33 is shown in Table 1 below, and the mass percentage of each component used to prepare the surface-hardened gradient cemented carbide is shown in Table 2 below.

[0030] Table 1 Composition of different alloy binder phases used in Examples 1-33

[0031]

[0032]

[0033] Table 2 Components used to prepare surface-hardened gradient cemented carbide in Examples 1-33

[0034]

[0035]

[0036] The preparation method of the gradient cemented carbide of embodiment 1-33 comprises the following steps:

[0037] (1) Preparation of alloy binder phase

[0038] Weigh the powders that make up the alloy binder phase according to the mass percentage, put the powders in the omnidirectional planetary ball mill, and use cemented carbide gr...

Embodiment 34

[0048] This embodiment provides a surface-hardened gradient cemented carbide and a preparation method of the surface-hardened gradient cemented carbide.

[0049] The composition of the alloy binder phase, raw material powder and paraffin wax in this example is consistent with that of Example 15.

[0050] In the preparation method of this embodiment, the preparation of the alloy binder phase, the preparation of the blank, the pressing of the blank, and the pre-sintering are consistent with those of Example 15. The difference between this example and Example 15 lies in the sintering step, which is as follows:

[0051] Put the green body in the sintering furnace, raise the temperature to 1200-1250°C at a speed of 5-8°C / min, then fill the sintering furnace with nitrogen and raise the temperature to 1420-1450°C at a speed of 1-3°C / min, Keep warm for 80min and maintain a pressure above 0.2MPa; then cool down to 1000-1200℃ at a rate of 2-6°C / min, keep warm for 120min, and maintain a ...

Embodiment 15

[0057] The cross-sectional microscopic morphology of the surface-hardened gradient cemented carbide HJ15 prepared in Example 15 is as follows figure 1 As shown, it can be seen from the figure that the cross section of the alloy is composed of surface layer, transition layer and internal layer; the surface layer is a region with a thickness of about 12 μm, followed by a transition layer with a thickness of about 50 μm, and the transition layer appears Abnormally grown WC grains, while the WC grains in the inner layer of the alloy are fine and evenly distributed. figure 2 is the line scan diagram of the Co content of the section of HJ15, image 3 is the line scan diagram of the Ti content of the section of HJ15 ( figure 2 with image 3 The "distance" in the middle abscissa refers to the vertical distance from the outer surface of the object to the scanning point). It can be seen from the figure that within 30 μm from the alloy surface, the Ti content of the alloy surface lay...

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Abstract

The invention relates to the technical field of cemented carbide preparation, in particular to surface-hardened gradient cemented carbide and a preparation method thereof. By adjusting components of an alloy binding phase, the WC crystalline grains in the prepared cemented carbide are small, even in distribution, high in density and remarkable in gradient, the cemented carbide is made to have the more excellent mechanical property, and the red hardness of the cemented carbide is improved. The components and thickness of a gradient layer of the cemented carbide are controlled by adjusting blank formulas, sintering temperature, sintering time and other parameters, the surface layer of the cemented carbide is made to be rich in cubic phase and poor in binding phase, and due to the fact that a transition layer rich in alloying binding phase is arranged below the surface layer, the cemented carbide is excellent in hardness, wear resistance and roughness, and the cemented carbide can be used for metal machining. The cemented carbide prepared through the method has the excellent wear resistance, strength, hardness and toughness at the same time. According to the method, the functional gradient cemented carbide can be produced by slightly modifying existing equipment and processes, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of cemented carbide preparation, in particular to a surface-hardened gradient cemented carbide and a preparation method thereof. Background technique [0002] Cemented carbide is a material with many excellent properties such as high wear resistance, high strength and corrosion resistance produced by powder metallurgy process. Cemented carbide is usually composed of hard phase (WC, TiC, VC, etc.) and alloy binder phase (C O or Ni), which combines the high wear resistance and high hardness of the carbide phase and the sufficient strength and toughness of the metal binder phase, making it widely used in the field of metal cutting. However, due to the gradual development of cutting technology in the direction of dry cutting, hard cutting, high speed and ultra-precision, the requirements for the surface performance and high temperature performance of cemented carbide tools are getting higher and higher. Due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 伍尚华陈健邓欣刘伟弓满锋
Owner GUANGDONG UNIV OF TECH
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