Ultrahigh-temperature high-entropy boride ceramic powder and preparation method thereof
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A technology of ceramic powder and boride, which is applied in the field of ceramic materials to achieve the effects of low binding energy, reduced element segregation, and low enthalpy of formation
Active Publication Date: 2020-10-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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[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;
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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 ultrahigh-temperature high-entropy boride ceramic powder and a preparation method thereof, and belongs to the technical field of ceramic materials. The ceramic powder disclosed by the invention is of a single-phase hexagonal crystal structure; the chemical formula is abbreviated as TMExB2, TME is at least four of Ha, Zr, Nb, Ti, Ta, Mo, W and Cr, and the product of the number of elements in TME times x is 1; the ceramic powder can keep a stable single-phase structure mainly by regulating and controlling the components of the ceramic powder, the problems of complex interfaces and stress caused by multiple components are solved, and the ceramic powder has excellent mechanical properties. Furthermore, the high-entropy boride ceramic powder is synthesized by an induction plasma spheroidizing sintering process for the first time; the method is simple in process and short in period, the high-entropy boride ceramic powder with certain particle size distribution, compact surface, high degree of sphericity, good fluidity, no element segregation phenomenon and good chemical structure stability can be obtained by regulating and controlling process parameters, and themethod 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...
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