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Preparation method for hard high-entropy alloy composite material

A high-entropy alloy and composite material technology, which is applied in the field of preparing hard high-entropy alloy composite materials, can solve the problems of reducing the mechanical properties of materials, low mechanical properties of finished products, and high porosity of green bodies, and achieve short sintering time and good comprehensive performance , good toughness

Active Publication Date: 2018-05-22
中科粉研(河南)超硬材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional powder metallurgy process, the molding process usually adopts the molding method, but there is friction between the powder and the mold wall during the molding process, and the hard particles have high hardness, so that the green body made by molding has a high porosity. Defects, resulting in low mechanical properties of the finished product; moreover, usually the sintering time after grinding and pressing is longer, and the structure growth phenomenon in the material is obvious, thereby reducing the mechanical properties of the material

Method used

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  • Preparation method for hard high-entropy alloy composite material
  • Preparation method for hard high-entropy alloy composite material
  • Preparation method for hard high-entropy alloy composite material

Examples

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Comparison scheme
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Embodiment 1

[0027] A kind of preparation method of hard high entropy alloy composite material of the present invention, its process flow chart is as figure 1 shown, including the following steps:

[0028] (1) Choose WC powder with a particle size of -280 mesh and alloy element powder (oxygen content less than 0.3%) with a particle size of -300 mesh as raw materials, the atomic ratio of WC powder and metal element powder is 3: 7, Fe in the metal element powder The atomic ratio of Cr powder, Ni powder, and Co powder is 1:1:1:1; among them, the alloy element powder does not contain other impurities except a small amount of unavoidable impurity oxygen, and the raw materials do not contain WC powder, Elemental components other than Fe powder, Cr powder, Ni powder, and Co powder;

[0029] (2) The raw material powder that step (1) is obtained is packed in the ball mill jar, adopts planetary ball mill and cemented carbide ball mill jar, ball mills at the speed of 250r / s 5 hours, obtains fine-gra...

Embodiment 2

[0035] A kind of preparation method of hard high entropy alloy composite material of the present invention, its process flow chart is as figure 1 shown, including the following steps:

[0036] (1) choose particle size as -600 mesh cubic BN powder and particle size as -300 mesh alloy element powder (oxygen content is lower than 0.3%) as raw material, the atomic ratio of BN powder and metal element powder is 4: 6, in the metal element powder The atomic ratio of Fe powder, Cr powder, Ni powder and Co powder is 1:1:1:1; Among them, the alloy element powder does not contain other impurities except a small amount of unavoidable impurity oxygen, and the raw materials do not contain BN powder , Fe powder, Cr powder, Ni powder, Co powder other elemental components;

[0037] (2) The raw material powder that step (1) is obtained is packed in the ball mill jar, adopts planetary ball mill and cemented carbide ball mill jar, ball mills 7 hours under the speed of 240r / s, obtains fine-graine...

Embodiment 3

[0042] A kind of preparation method of hard high entropy alloy composite material of the present invention, its process flow chart is as figure 1 shown, including the following steps:

[0043] (1) Choose diamond powder with a particle size of -400 mesh and alloy element powder (oxygen content lower than 0.3%) as raw materials with a particle size of -300 mesh, the atomic ratio of diamond powder and metal element powder is 2: 8, Fe in the metal element powder The atomic ratio of Cr powder, Ni powder, and Co powder is 1:1:1:1; among them, the alloy element powder does not contain other impurities except a small amount of unavoidable impurity oxygen, and the raw materials do not contain diamond powder, Elemental components other than Fe powder, Cr powder, Ni powder, and Co powder;

[0044] (2) The raw material powder obtained in step (1) is packed into a ball mill jar, and ball milled at a speed of 260r / s for 6 hours by using a planetary ball mill and a cemented carbide ball mil...

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Abstract

The invention discloses a preparation method for a hard high-entropy alloy composite material. The preparation method comprises the following steps that (1) superhard material powder and alloying element powder are selected as raw materials, wherein, the alloying element powder is selected from Fe powder, Co powder, Cr powder, Ni powder, Mn powder, and alloy powder composed of any three or more ofthe foregoing elements; the superhard material powder is selected from one or more of WC alloy powder, BN powder, and diamond powder; (2) the raw materials selected in step (1) is subjected to ball milling to obtain fine-grained powder; and (3) the fine-grained powder is subjected to spark plasma sintering and furnace cooling, and a agglomerate body is the hard high-entropy alloy composite material. According to the preparation method for the hard high-entropy alloy composite material, high-entropy alloys with excellent plasticity such as Fe, Co, Cr, Ni and Mn are adopted as matrices, and superhard particles such as WC and cubic BN are added as reinforcing phases, so that high hardness of products can be obtained, and the cost of hard high-entropy raw materials and the density and the preparation difficulty of products are reduced.

Description

technical field [0001] The invention belongs to the field of alloy materials, and in particular relates to a method for preparing hard high-entropy alloy composite materials by using a powder metallurgy method. Background technique [0002] Powder metallurgy tool steel has the advantages of high strength, high hardness and wear resistance, and is widely used in molds, cutting tools, rolls and other fields. However, because this type of material contains many types of alloying elements and the structure of carbides is complex, it is difficult to control the microstructure, phase structure and morphology of carbide particles. At the same time, due to the low plasticity and poor toughness of powder metallurgy tool steel, it is difficult to prepare and process tools and molds. By changing the matrix composition of tool steel, it is possible to improve its plasticity. High-entropy alloys also have high content of alloying elements, but relatively few types, simple phase structu...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/05B22F3/105
CPCB22F3/105C22C1/05
Inventor 刘咏周睿刘彬
Owner 中科粉研(河南)超硬材料有限公司
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