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Gradient cemented carbide with surface softening and preparation method thereof

A cemented carbide and gradient technology, which is applied in the field of surface softened gradient cemented carbide and its preparation, can solve problems such as the failure of cemented carbide coated tools, and achieve excellent mechanical properties, growth inhibition, and fine WC grains.

Inactive Publication Date: 2017-04-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the problem that the cracks inside the coating of the existing hard alloy coating tool are easily accelerated and propagated into the substrate during use, which leads to the failure of the hard alloy coating tool, and provides a gradient hard alloy with surface softening And the preparation method thereof, the surface-softened gradient cemented carbide is used as the substrate of the cemented carbide coating tool, which can slow down the tendency of coating cracks to expand into the matrix, and prolong the service life of the cemented carbide coating tool

Method used

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  • Gradient cemented carbide with surface softening and preparation method thereof
  • Gradient cemented carbide with surface softening and preparation method thereof
  • Gradient cemented carbide with surface softening and preparation method thereof

Examples

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Effect test

Embodiment 1-35

[0028] Embodiments 1-35 provide a surface-softened gradient cemented carbide and a preparation method of the surface-softened gradient cemented carbide.

[0029] The mass percentage of each component of the alloy binder phase used in Examples 1-35 is shown in Table 1 below, and the mass percentage of each component used to prepare the surface-softened gradient cemented carbide is shown in Table 2 below.

[0030] Table 1 The components of the alloy binder phase in Examples 1-35

[0031]

[0032] Table 2 Components used to prepare surface-softened gradient cemented carbide in Examples 1-35

[0033]

[0034]

[0035] The preparation method of the surface-softened gradient cemented carbide of embodiment 1-35 comprises the following steps:

[0036] (1) Preparation of alloy binder phase

[0037] Weigh the metal powders that make up the alloy binder phase according to the mass percentage, put the metal powders in an omnidirectional planetary ball mill, and use cemented car...

Embodiment 36

[0048] This embodiment provides a surface-softened gradient cemented carbide and a preparation method of the surface-softened 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 10.

[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 10. The difference between this example and Example 10 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 raise the temperature to 1420-1450°C at a speed of 1-3°C / min, then keep it warm for 80min, and keep it for 10 -3 Vacuum degree above Pa. Then cool down to 1000-1200°C at a rate of 2-6°C / min, keep warm for 120min, and keep for 10 -3 The degree of vacuum ...

Embodiment 10

[0057] The cross-sectional micro-morphology of the surface-softened gradient cemented carbide HJ10 prepared in Example 10 is as follows figure 1 As shown, it can be seen from the figure that there is basically no Ti-containing cubic phase on the surface of the alloy (substantially no black spots on the surface); figure 2 It is a line scan diagram of the Co content of the section of HJ10 (the "distance" on the abscissa refers to the vertical distance from the outer surface of the object to the scanning point), and within a certain thickness range, the Co content shows a decreasing trend from the surface to the inside; image 3 It is a line scan diagram of the Ti content of the section of HJ10 (the "distance" on the abscissa refers to the vertical distance from the outer surface of the object to the scanning point), and within a certain thickness range, the Ti content shows an increasing trend from the surface to the inside; Figure 4 It is the XRD spectrum of HJ10, the alloy s...

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Abstract

The invention relates to the technical field of cemented carbide preparation, in particular to surface-softened gradient cemented carbide and a preparation method thereof. The solubility of WC crystalline grains in a liquid phase Co is lowered by adjusting components of an alloy binding phase, so that the situation that the WC crystalline grains grow through a dissolution and reprecipitation mechanism is reduced, growth of the WC crystalline grains is restrained, then the WC crystalline grains in the prepared cemented carbide are small, even in distribution, high in density and remarkable in gradient, the gradient cemented carbide is made to have the more excellent mechanical property, and the red hardness of the gradient cemented carbide is improved. The cemented carbide prepared through the method is adopted as a base body of a coating cutter, the trend that coating cracks expand into the base body can be slowed down, and the service life of the coating tool can be prolonged. 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 hard alloy preparation, in particular to a gradient hard alloy with surface softening 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 technology. The development of modern manufacturing industry has put forward higher and higher requirements for the performance of cemented carbide cutting tools. For example, under the condition of high speed and intermittent cutting, it is required that cemented carbide cutting tools have good wear resistance on the surface and good wear resistance as a whole. Impact performance, cemented carbide with traditional homogeneous structure usually cannot meet this requirement. For this reason, one or more wear-resistant coatings, such as TiN, Ti(C,N), Al 2 o 3 Wait. Since the deposition temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/02
Inventor 伍尚华陈健邓欣刘伟弓满锋
Owner GUANGDONG UNIV OF TECH
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