A kind of surface-hardened gradient cemented carbide and its preparation method

A cemented carbide and gradient technology, which is applied in the field of surface hardened gradient cemented carbide and its preparation, can solve the problems of difficulty in taking into account wear resistance, strength, hardness and toughness, adjustment and limitation, etc., and achieve excellent mechanical properties, improve Red-hard, fine-grained effect

Inactive Publication Date: 2017-08-08
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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  • A kind of surface-hardened gradient cemented carbide and its preparation method
  • A kind of surface-hardened gradient cemented carbide and its preparation method
  • A kind of surface-hardened gradient cemented carbide and its preparation method

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 and 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 laye...

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Abstract

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. The invention adjusts the composition of the alloy binder phase to make the WC crystal grains in the prepared cemented carbide fine, evenly distributed, high in density and obvious in gradient, so that the cemented carbide exhibits more excellent mechanical properties and improves the performance of the cemented carbide. of red hardness. The composition and thickness of the cemented carbide gradient layer are controlled by adjusting parameters such as blank formula, sintering temperature and sintering time, so that the surface layer of the cemented carbide is rich in cubic phase and poor in binder phase, and there is a rich alloyed binder phase under the surface The excessive layer, so that the cemented carbide has excellent hardness, wear resistance and toughness, and can be used for machining of metals. The cemented carbide prepared by the method of the invention has excellent wear resistance, strength, hardness and toughness at the same time. The method of the invention can produce functionally graded cemented carbide with little modification to existing equipment and processes, and is suitable for industrialized 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 Patents(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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