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Refractory high-entropy composite material and preparation method thereof

A composite material and high-entropy technology, applied in the field of refractory high-entropy composite materials and its preparation, can solve the problems of high brittleness, reduced high-temperature strength index, yield strength, and peak strength reduction of Nb-Ta-Mo-W alloys

Active Publication Date: 2021-09-10
有研纳微新材料(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the Nb-Ta-Mo-W alloy system is brittle at room temperature. For example, the strain of NbMoTaW at room temperature compression fracture in the as-cast state is less than 5%, which greatly limits its application range.
However, these elements reduce the high temperature strength index of Nb-Ta-Mo-W alloy while improving the mechanical properties of Nb-Ta-Mo-W alloy at room temperature.
For example, it has been reported that the yield strength and peak strength of VNbMoTaW alloy (as-cast) at 1200°C are 735MPa and 943MPa respectively, and after adding Ti, the yield strength and peak strength of TiVNbMoTaW alloy (as-cast) at 1200°C are reduced to 659MPa and 696MPa

Method used

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  • Refractory high-entropy composite material and preparation method thereof
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  • Refractory high-entropy composite material and preparation method thereof

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preparation example Construction

[0042] According to an embodiment of the present invention, a method for preparing the above-mentioned refractory high-entropy composite material is also provided, comprising the following steps:

[0043] Step 1) Weigh the ingredients

[0044] The raw materials are: niobium powder (purity 99.9%, particle size<10μm), molybdenum powder (purity 99.9%, particle size<10μm), tantalum powder (purity 99.9%, particle size<10μm), tungsten powder (purity 99.9%, particle size diameter<10μm), HfC particles (purity 99.0%, particle size range 1-5μm).

[0045] The selected raw materials are weighed according to the composition ratio.

[0046] Step 2) Mechanical Alloying

[0047] Put niobium powder, molybdenum powder, tantalum powder, tungsten powder, HfC particles and process control agent into a tungsten carbide ball mill tank for mechanical alloying treatment, and the whole process of mechanical alloying treatment is protected by an argon (Ar>99.0%) atmosphere To obtain mechanically allo...

Embodiment 1

[0052] A particle-reinforced refractory high-entropy composite material, which is composed of a refractory high-entropy alloy matrix and uniformly distributed HfC particles, wherein the refractory high-entropy alloy matrix is ​​composed of Nb, Mo, Ta and W elements in an equal atomic ratio, and its chemical formula It is recorded as NbMoTaW; the amount of HfC particles added is 2.0% of the mass of the refractory high-entropy alloy matrix in terms of mass percentage.

[0053] The preparation method of the particle-reinforced refractory high-entropy composite material comprises the following steps:

[0054] Step 1) Weigh the ingredients, target NbMoTaW high entropy alloy 50g, HfC particles 1.0g.

[0055] Substance materials used according to the design alloy are:

[0056]

[0057]

[0058] The selected materials were weighed according to the composition ratio to obtain the target particle-reinforced refractory high-entropy composite material NbMoTaW-2.0wt%HfC.

[0059] S...

Embodiment 2

[0072] A particle-reinforced refractory high-entropy composite material is composed of a refractory high-entropy alloy matrix and uniformly distributed HfC particles, wherein the refractory high-entropy alloy matrix is ​​composed of Nb, Mo, Ta and W elements and is composed of non-equivalent atomic ratios. The chemical formula is recorded as Nb 20 Mo 20 Ta 35 W 25 ; The amount of HfC particles added is 1.0% of the mass of the refractory high-entropy alloy matrix in terms of mass percentage.

[0073] The preparation method of the particle-reinforced refractory high-entropy composite material comprises the following steps:

[0074] Step 1) Weigh ingredients, target Nb 20 Mo 20 Ta 35 W 25 High entropy alloy 50g, HfC particles 0.5g.

[0075] Substance materials used according to the design alloy are:

[0076]

[0077] The selected material is weighed according to the composition ratio to obtain the target particle reinforced refractory high-entropy composite material N...

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Abstract

The invention provides a refractory high-entropy composite material and a preparation method thereof. The refractory high-entropy composite material comprises a solid solution matrix and HfC (hafnium carbide) particles dispersed in the solid solution matrix,wherein the solid solution matrix is Nb-Mo-Ta-W alloy composed of Nb, Mo, Ta and W elements; and the mass of the HfC particles is 0.5-8% of the mass of the solid solution matrix. The refractory high-entropy composite material is prepared by adding HfC particles into Nb-Mo-Ta-W refractory high-entropy alloy and through mechanical alloying and spark plasma hot pressing sintering methods, and the refractory high-entropy composite material has the characteristics of being high in hardness, high in compressive strength, stable in structure performance and easy to prepare and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of material preparation and application, in particular to a refractory high-entropy composite material and a preparation method thereof. Background technique [0002] Refractory high-entropy alloys are a type of high-entropy alloys composed of high-melting point elements (W, Mo, Ta, Nb, Hf, Zr, Ti, V, etc.). Due to the high melting point of the components and the effects of high entropy effect and solid solution strengthening effect, this type of alloy has higher corrosion resistance than traditional superalloys such as Inconel 718 and Haynes 230 in high temperature environments (>1200°C). strength. At present, researchers have successfully developed a variety of refractory high-entropy alloy systems, such as Nb-Ta-Mo-W, Nb-Ti-Zr and Nb-Ti-V, among which the Nb-Ta-Mo-W system exhibits The more excellent high-temperature characteristics have attracted extensive attention from researchers. [0003] Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C32/00C22C1/05C22C1/10B22F3/14
CPCC22C30/00C22C32/00C22C1/05C22C1/1084B22F3/14
Inventor 赵新明胡强盛艳伟付东兴顾涛王永慧王志刚安宁张富文张金辉刘英杰李楠楠
Owner 有研纳微新材料(北京)有限公司