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A kind of super high temperature high entropy boride ceramic powder and its preparation method

A technology of ceramic powder and boride is applied in the field of ceramic materials to achieve the effect of high elastic modulus, uniform single-phase crystal structure and maintaining single-phase crystal structure

Active Publication Date: 2022-04-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide an ultra-high-temperature high-entropy boride ceramic powder. By adjusting its composition, the ceramic powder can maintain a stable single-phase structure and eliminate multiple The complex interface and stress problems brought by the components make its mechanical properties (elastic modulus, hardness) better than multi-component mixing rules;

Method used

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  • A kind of super high temperature high entropy boride ceramic powder and its preparation method
  • A kind of super high temperature high entropy boride ceramic powder and its preparation method
  • A kind of super high temperature high entropy boride ceramic powder and its preparation method

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Effect test

Embodiment 1

[0041] (1) HfB 2 、TiB 2 , CrB 2 、TaB 2 and NbB 2 Dosing according to the equimolar ratio of metal atoms and adding them to the ball mill tank, then adding deionized water, PVA and ball milling beads, the solid content is 40%, the mass fraction of PVA is 0.4%, the ball-to-material ratio is 4:1, at 250rpm Ball milled for 2 hours, mixed evenly to obtain slurry;

[0042] (2) agglomerating and granulating the slurry in step (1) by using a spray drying granulation tower, and passing the granulated powder through an inspection sieve to obtain an agglomerated powder with a particle size not greater than 70 μm;

[0043] Among them, the spray drying granulation parameters are: the inlet temperature is 250°C, the outlet temperature is 100°C, the nozzle speed is 30rpm, and the peristaltic pump speed is 25rpm;

[0044] (3) Utilize induction plasma spheroidization sintering equipment to carry out high-temperature sintering treatment to the agglomerated powder in step (2) for 5 times to...

Embodiment 2

[0052] (1) HfB 2 、TiB 2 , CrB 2 、TaB 2 and NbB 2 Dosing according to the equimolar ratio of metal atoms and adding them to the ball milling tank, then adding deionized water, PVA and ball milling beads, the solid content is 40%, the mass fraction of PVA is 0.4%, the ball-to-material ratio is 4:1, at 350rpm Ball milling for 4 hours, mixing evenly to obtain slurry;

[0053] (2) agglomerating and granulating the slurry in step (1) by using a spray drying granulation tower, and passing the granulated powder through an inspection sieve to obtain an agglomerated powder with a particle size not greater than 70 μm;

[0054] Among them, the spray drying granulation parameters are: the inlet temperature is 250°C, the outlet temperature is 100°C, the nozzle speed is 30rpm, and the peristaltic pump speed is 25rpm;

[0055] (3) Utilize induction plasma spheroidization sintering equipment to carry out high-temperature sintering treatment to the agglomerated powder in step (2) for 5 tim...

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Abstract

The invention relates to an ultra-high-temperature, high-entropy boride ceramic powder and a preparation method thereof, belonging to the technical field of ceramic materials. The ceramic powder of the present invention has a single-phase hexagonal crystal structure, and the chemical formula is abbreviated as TME x B 2 , TME is at least four of Ha, Zr, Nb, Ti, Ta, Mo, W, and Cr, and the product of the number of element types in TME and x is 1. The ceramic powder mainly adjusts its composition to make It can maintain a stable single-phase structure, eliminate the complex interface and stress problems caused by multi-components, and make it have excellent mechanical properties. In addition, the present invention is the first to synthesize high-entropy boride ceramic powder through the induction plasma spheroidization sintering process. , no element segregation phenomenon, high-entropy boride ceramic powder with good chemical structure stability, has a good application prospect.

Description

technical field [0001] The invention relates to an ultra-high-temperature, high-entropy boride ceramic powder and a preparation method thereof, belonging to the technical field of ceramic materials. Background technique [0002] Ultra-high temperature ceramics (UHTCs) of transition metal diborides are due to their unique physical and chemical properties, such as melting point over 3000K, thermal shock resistance, corrosion resistance, high hardness, chemical inertness, good electrical and thermal conductivity, intrinsic solar energy Selectivity and low neutron absorption, etc., are widely used in aerospace (wing leading edge, nose tip, etc.), solar energy (receivers in solar power plants), nuclear reactors, metallurgy (molten metal crucibles), cutting tools, microelectronics, etc. field, but the fracture toughness of UHTCs is relatively low and the oxidation resistance at ultra-high temperature is not excellent enough. [0003] Synthesize high-entropy boride ceramics with m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/626C04B35/634C04B35/64
CPCC04B35/58064C04B35/62695C04B35/63416C04B35/62655C04B35/64C04B2235/666C04B2235/661C04B2235/5436C04B2235/9607
Inventor 柳彦博马壮张泽朱时珍鲁剑啸
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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