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Transition metal carbide high-entropy ceramic particles and preparation method thereof

A technology of ceramic particles and transition metals, which is applied in the field of transition metal carbide high-entropy ceramic powder and its preparation, can solve the problems of long holding time, high synthesis temperature, impurity pollution, etc., and achieve low raw material cost, simple preparation method, The effect of low energy consumption

Active Publication Date: 2019-11-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have the problems of impurity pollution, high synthesis temperature (~2000°C) and long holding time, high energy consumption, and are difficult to apply in industrial production

Method used

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  • Transition metal carbide high-entropy ceramic particles and preparation method thereof
  • Transition metal carbide high-entropy ceramic particles and preparation method thereof
  • Transition metal carbide high-entropy ceramic particles and preparation method thereof

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preparation example Construction

[0060] The present invention also provides a method for preparing transition metal carbide high-entropy ceramic particles, comprising the steps of:

[0061] Step 1: Take titanium powder, vanadium powder, tantalum powder, niobium powder, carbon source and aluminum powder, and mix them with a ball mill mixer. The grinding ball is one of zirconia balls, high-speed steel balls or agate balls. The diameter is 5-22mm, the ball-to-material ratio is 5:1-20:1, the ball milling speed is 50-100r / min, after ball milling and mixing for 4-24 hours, take out the wrapped aluminum foil, put it into a cylindrical mold, and press it on a hydraulic testing machine into a cylindrical compact with a diameter of 30mm;

[0062] Wherein, the molar ratio of titanium powder, vanadium powder, tantalum powder, niobium powder and carbon source is a:b:c:d:1, and the numerical range of a, b, c, d is 5% to 35%, and a+b+c+d=1, the molar ratio of the aluminum powder to the carbon source is 3:1-9:1;

[0063] T...

Embodiment 1

[0069] Aluminum powder, titanium powder, vanadium powder, tantalum powder, niobium powder and carbon nanotubes (CNTs) were selected as initial raw materials, and aluminum powder, titanium powder, vanadium powder, tantalum powder, niobium powder and carbon nanotubes were prepared according to the Al 4 (Ti 0.25 V 0.25 Nb 0.25 Ta 0.25 )C is equipped. Put the above-mentioned reactant powder and zirconia balls into the mixing tank and mix them. The diameter of the ZrO2 balls is 5-22mm, the ball-to-material ratio is set to 5:1, and the ball milling speed of the mixer is set to 50r / min, and the mixing time is set to 12 hours; then take out the above-mentioned mixture, weigh 50g of powder, wrap it in aluminum foil, put it into a cylindrical mold, and press it into a cylindrical mold with a diameter of 30mm and a height of 30mm on a hydraulic testing machine. Blank; put the obtained cylindrical compact into a graphite mold, and then put them together in a tube furnace, protect it ...

Embodiment 2

[0071] Select aluminum powder, titanium powder, vanadium powder, tantalum powder, niobium powder and carbon nanotubes (CNTs) as the initial raw materials, and mix aluminum powder, titanium powder, vanadium powder, tantalum powder, niobium powder and carbon nanotubes according to the molar ratio Al 9 (Ti 0.28 V 0.22 Nb 0.23 Ta 0.27 )C is equipped. Put the above-mentioned reactant powder and zirconia balls into the mixing tank and mix them. The diameter of the ZrO2 balls is 5-22mm, the ball-to-material ratio is set to 5:1, and the ball milling speed of the mixer is set to 100r / min, and the mixing time is set to 8 hours; then take out the above-mentioned mixture, weigh 50g of powder, wrap it in aluminum foil, put it into a cylindrical mold, and press it into a cylindrical mold with a diameter of 30mm and a height of 30mm on a hydraulic testing machine. Blank; put the obtained cylindrical compact into a graphite mold, and then place it together in a vacuum hot-pressing sinter...

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Abstract

The invention discloses transition metal carbide high-entropy ceramic particles. The transition metal carbide high-entropy ceramic particles are single-phase solid solutions and have a chemical formula of (TiaVbNbcTad) C and are in face-centered cubic close-packed structures, wherein a, b, c, d range from 5% to 35%, and the sum of a, b, c and d is 1. The invention also provides a preparation method of the transition metal carbide high-entropy ceramic particles, namely a one-step heating method. The method comprises the following steps of 1: taking titanium powder, vanadium powder, tantalum powder, niobium powder, a carbon source and aluminum powder, ball-milling and mixing for 4-24h, taking out a wrapping aluminum foil, and preparing into a cylindrical pressed compact; 2: placing the cylindrical pressed compact into a die, heating to be 750-800 DEG C under the protection of argon or in a vacuum state, keeping the temperature for 1-1h, continuously heating to be 1500-1700 DEG C, keepingthe temperature for 10-300min, cooling to room temperature, and taking out; wherein the heating rate is 8-30 DEG C / min; and 3: soaking with concentrated hydrochloric acid to remove an aluminum substrate to obtain the transition metal carbide high-entropy ceramic particles. The invention also provides a preparation method of the transition metal carbide high-entropy ceramic particles, namely a two-step heating method.

Description

technical field [0001] The invention relates to the field of ultra-high temperature ceramic materials, and more specifically, the invention relates to a transition metal carbide high-entropy ceramic powder and a preparation method thereof. Background technique [0002] Transition metal carbides and borides are a class of materials called ultra-high temperature ceramics (UHTCs). Due to their high melting point, high hardness, high elastic modulus, and good oxidation resistance, they are used in engines, hypersonic vehicles, Candidate materials for extreme environment applications such as furnace components. However, due to the shortcomings of single carbide such as high brittleness and poor low temperature stability, its industrial application is limited. The high-entropy ceramic materials proposed in recent years are a new type of ceramic materials based on the concept of high-entropy. Generally, high-entropy carbide ceramics have better physical and mechanical properties t...

Claims

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Application Information

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IPC IPC(8): C22C29/06C22C1/05
CPCC22C1/055C22C29/067
Inventor 赵庆龙梅杰姜启川邱丰
Owner JILIN UNIV