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(HfTaZrTiNb) C high-entropy ceramic powder and preparation methods of high-entropy ceramic powder and high-entropy ceramic blocks

A technology of ceramic powder and ceramic powder, which is applied in the field of preparation of high-entropy compound materials, can solve problems such as the inability to realize the preparation of bulk ceramics and limit the application of high-entropy carbide ceramics, and achieve the effect of fine grain size and lower sintering temperature

Inactive Publication Date: 2018-08-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature "Characterization of multi-principal-element(TiZrNbHfTa)N and (TiZrNbHfTa)C coatings for biomedicalapplications.[J].Journal of the Mechanical Behavior of Biomedical Materials,2012,10(10):197."using magnetron sputtering The method prepared high-entropy carbide thin films, but cannot realize the preparation of bulk ceramics, this method greatly limits the application of high-entropy carbide ceramics

Method used

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  • (HfTaZrTiNb) C high-entropy ceramic powder and preparation methods of high-entropy ceramic powder and high-entropy ceramic blocks

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of (HfTaZrTiNb)C high-entropy bulk ceramic powder, the specific steps and process parameters are as follows:

[0028] Step 1. Preparation of amorphous ceramic powder: Weigh five powders of TaC, HaC, NbC, TiC, and ZrC in equimolar ratios in a glove box filled with argon, add a small amount of stearic acid, and put the powder into In the cemented carbide tank, the selected ball-to-material ratio is 9:1, the rotational speed is 550r / min, every 1h of ball milling is intermittent for 5min, and a total of 8h of ball milling is obtained to obtain an amorphous ceramic mixture with uniform composition;

[0029] Step 2. Preparation of high-entropy ceramic powder: heat-treat the ceramic powder obtained in step 1 at 1400° C. for 6 hours to obtain (HfTaZrTiNb)C crystalline high-entropy ceramic powder.

Embodiment 2

[0031] The amorphous ceramic powder in Example 1 is prepared into a high-entropy ceramic block: the amorphous ceramic powder is packed into a graphite mold in a glove box, and the graphite mold is sealed, and then the mold is placed in a discharge Sintering is carried out in a plasma furnace to obtain (HfTaZrTiNb)C bulk ceramics.

Embodiment 3

[0033] Prepare the high-entropy ceramic powder obtained in step 2 of Example 1 into a high-entropy ceramic block: put the high-entropy ceramic powder into a graphite mold in a glove box, seal the graphite mold, and then place the mold in Sintering is carried out in a discharge plasma furnace to obtain (HfTaZrTiNb)C bulk ceramics.

[0034] The sintering process of described embodiment 2 and embodiment 3 is as follows:

[0035] Sintering equipment: spark plasma sintering furnace

[0036] Heating method: AC pulse current

[0037] Sintering temperature: 1700°C

[0038] Sintering time: 7min

[0039] Sintering pressure: 30MPa

[0040] Heating rate: 75°C / min

[0041] The average grain size of the sintered (HfTaZrTiNb)C high-entropy ceramics is 5um, the weight gain after 10h oxidation is 13%, and the KIC is 4.5MPa.m 1 / 2 , compared with the performance of ceramics prepared from five kinds of raw material powders, the oxidation resistance and KIC of (HfTaZrTiNb)C high-entropy cera...

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Abstract

The invention relates to (HfTaZrTiNb) C high-entropy ceramic powder and preparation methods of the high-entropy ceramic powder and high-entropy ceramic blocks. Five-face centered cube (FCC) carbonizedpowder is made into ceramic powder through a high-energy ball milling method, then a discharging plasma method is adopted to realize preparation of the high-entropy ceramic blocks, and quick sintering of ceramic within a temperature range of 1700-2350 DEG C can be realized to obtain high-entropy ceramic with single-phase-face centered cube (FCC) structure. The preparation method of (HfTaZrTiNb) Chigh-entropy block ceramic is solved; the high-entropy ceramic with the FCC structure is finally obtained by strictly controlling parameters of a discharging plasma sintering furnace or a hot press furnace and characterizing XRD, so that the ceramic material system is enriched.

Description

technical field [0001] The invention belongs to a preparation method of high-entropy compound materials, and relates to a preparation method of (HfTaZrTiNb)C high-entropy ceramic powder, high-entropy ceramic powder and high-entropy ceramic block. Background technique [0002] High-entropy ceramics are a new type of ceramics that have appeared recently, and the appearance of this kind of ceramics has enriched the ceramic system. In the late 1990s, Professor Ye Junwei of Tsinghua University in Taiwan, China proposed the concept of high entropy, and defined it as element types ≥ 5, no dominant element, and the content of all elements was between 5% and 35%. High-entropy ceramic powders can be sintered to obtain a stable solid solution phase. So far, people's research on high-entropy is mainly concentrated in the field of alloys, and there are few studies on high-entropy ceramics, which have high thermal conductivity, high melting point, good corrosion resistance, good biocompa...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/626
CPCC04B35/5607C04B35/5611C04B35/5622C04B35/6261C04B35/62675C04B2235/5436
Inventor 王一光王毅王皓轩陈意高任科
Owner NORTHWESTERN POLYTECHNICAL UNIV
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