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Superhard composite material and method for preparation thereof

A composite material and superhard technology, which is applied in the field of combined metal composition, can solve problems such as performance limitations and poor variability in composition design

Inactive Publication Date: 2009-04-29
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Relatively speaking, traditional bonded metals have fewer main elements, poor variability in composition design, and limited performance.

Method used

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  • Superhard composite material and method for preparation thereof
  • Superhard composite material and method for preparation thereof
  • Superhard composite material and method for preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The experimental process of this embodiment is as follows figure 1 As shown, a variety of pure metal or alloy powders are mechanically milled to form multi-element high-entropy alloy powders. Then, the multi-element high-entropy alloy and tungsten carbide powder are mixed and ball-milled in different proportions to make it a uniformly mixed composite material powder. Then the uniform tungsten carbide-multivariate high-entropy alloy mixed powder is pressed and sintered at high temperature to make a superhard composite material sintered body, and finally the sintered body is tested and analyzed. In this embodiment, seven kinds of pure metal powders of aluminum, chromium, copper, iron, manganese, titanium and vanadium are used to produce multi-element high-entropy alloy powder. Using the Taguchi method L 8 2 7 Orthogonal tables are used to prepare A series alloys, as listed in Table 1.

[0024] Table I

[0025]

[0026] Note: The difference in the second decimal pl...

Embodiment 2

[0031] The experimental process of this embodiment is also the same figure 1 As shown, six metal element powders of aluminum, chromium, cobalt, copper, iron, and nickel were mixed and ball-milled into multi-element high-entropy alloy powder, and the configuration ratio was the B series alloy shown in Table 3. Taking B2 powder as an example, the relationship between different ball milling times and the crystal structure of multivariate high-entropy alloys is as follows: image 3 As shown in the X-ray diffraction analysis, it is shown that ball milling for more than 24 hours can obtain complete alloying and form a single FCC phase solid solution.

[0032] Table three

[0033]

[0034] Table 4 is an example of the code of its powder configuration. The X-ray diffraction analysis of the mixed powder after the three alloys in this table are mixed with WC powder and ball milled is as follows: Figure 4 As shown, it can be seen that there is only a mixed phase structure of WC pha...

Embodiment 3

[0045] The experimental process of this embodiment is also the same figure 1 As shown, carbon, chromium, nickel, titanium, and vanadium element powders are ball-milled to form a multi-component high-entropy alloy, and its configuration ratio is the C1 alloy shown in Table 7; Figure 6 It is the X-ray diffraction analysis of the high-entropy alloy C1 powder, which shows that the powder after ball milling is completely alloyed and forms a single BCC solid solution phase.

[0046] Table seven

[0047]

[0048] Table 8 shows the densities and room temperature hardness of sintered bodies of C1 alloy powders and WC powders in different proportions at different sintering temperatures. For example, the hardness of tungsten carbide-20% C1 alloy sintered body can reach Hv 1825. The room temperature hardness of the tungsten carbide-15% C1 alloy sintered body is as high as Hv 1972. The difference in hardness range also shows that it can be controlled by adjusting the ratio to provid...

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Abstract

The invention relates to a super-hard composite material. The preparation method for the composite material comprises the step of mixing ceramic phase powder and multi-element high-entropy alloy powder to form a mixture, a pressed mixture and a sintered mixture, so as to prepare the super-hard composite material. The multi-element high-entropy alloy is an alloy containing 5 to 11 main elements, and each main element accounts for 5 to 35 molar percent of the multi-element high-entropy alloy.

Description

【Technical field】 [0001] This invention relates to superhard composite materials, and more particularly to the composition of the bonding metals for which such materials are used. 【Background technique】 [0002] Since the development of superhard composite materials in the early 1920s, because of their high hardness, high temperature resistance, and wear resistance, they have been regarded as quite successful composite materials and widely used in the industry. Superhard composite materials are carbide superhard composite materials, which can be roughly divided into two categories: (1) tungsten carbide (WC)-based superhard composite materials, and (2) titanium carbide (TiC)-based superhard composite materials. General superhard composite materials are composed of two completely different compositions: one is composed of ceramic phase particles such as carbides with very high melting point and hardness but easy to be brittle, such as tungsten carbide, titanium carbide, vanad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05B22F3/00C22C30/00C22C29/00
Inventor 陈溪山杨智超叶均蔚黄金德
Owner IND TECH RES INST
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