(Hf,Ta,Nb,Ti)B2 high-entropy ceramic powder and preparing method thereof

A ceramic powder and high-entropy technology, which is applied in the field of high-entropy material preparation, can solve the problems of low purity, low sintering activity of powder, high oxygen content of high-entropy borides, etc. The effect of small, low oxygen content

Active Publication Date: 2019-09-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-entropy ceramic powder prepared by this method not only has a large grain size (310nm) and uneven distribution (200-450nm), but also has a high oxygen content (2.06wt.%) in the synthesized high-entropy boride after testing. Therefore, the sintering activity of the powder synthesized by this method is low, and it is difficult to obtain high-entropy ceramics with high density and high purity.
These shortcomings severely limit the generalization and application of this method

Method used

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  • (Hf,Ta,Nb,Ti)B2 high-entropy ceramic powder and preparing method thereof
  • (Hf,Ta,Nb,Ti)B2 high-entropy ceramic powder and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A (Hf,Ta,Nb,Ti)B 2 The preparation of high-entropy ceramic powder includes the following steps:

[0027] (1) Weigh 1.05g of HfO respectively 2 Powder, 0.40g TiO 2 Powder, 1.10g Ta 2 O 5 Powder, 0.66g of Nb 2 O 5 Powder, 0.42g of C powder and 0.72g of B 4 C powder was placed in a 150ml teflon ball mill and added 56.00g ZrO 2 Ball mill (the molar ratio of Hf, Ti, Nb and Ta in the raw material is 1:1:1:1, and the TiO in the raw material is 2 Powder, HfO 2 Powder, Nb 2 O 5 Powder and Ta 2 O 5 The molar ratio of the total amount of powder to C powder is 1:2.33, TiO 2 Powder, HfO 2 Powder, Nb 2 O 5 Powder and Ta 2 O 5 The total amount of powder and B 4 The molar ratio of C powder is 1:0.87, and the mass ratio of ball mill beads to raw materials is 12.9:1). The ball mill tank is placed in a ball mill and ball milled at a speed of 400r / min for 13h to obtain mixed powder;

[0028] (2) put the mixed powder obtained in the step (1) into a graphite crucible wit...

Embodiment 2

[0031] A (Hf, Ta, Nb, Ti,) B 2 The preparation of high-entropy ceramic powder includes the following steps:

[0032] Weigh 1.05g of HfO respectively 2 Powder, 0.40g TiO 2 Powder, 1.10g Ta 2 O 5 Powder, 0.66g Nb 2 O 5 Powder, 0.42g of C powder and 0.66g of B 4 C powder was placed in a 150ml teflon ball mill and 21.45g ZrO was added 2 Ball mill (the molar ratio of Hf, Ti, Nb and Ta in the raw material is 1:1:1:1, and the TiO in the raw material is 2 Powder, HfO 2 Powder, Nb 2 O 5 Powder and Ta 2 O 5 The molar ratio of the total amount of powder to C powder is 1:2.33, TiO 2 Powder, HfO 2 Powder, Nb 2 O 5 Powder and Ta 2 O 5 The total amount of powder and B 4 The molar ratio of C powder is 1:0.8, and the mass ratio of ball mill beads to raw materials is 5:1). The ball mill tank is placed in a ball mill and ball milled at a speed of 300r / min for 5h to obtain mixed powder;

[0033] Put the mixed powder obtained in the step (1) into a graphite crucible with a lid...

Embodiment 3

[0035] A (Hf,Ta,Nb,Ti)B 2 The preparation of high-entropy ceramic powder includes the following steps:

[0036] Weigh 1.05g of HfO respectively 2 Powder, 0.40g TiO 2 Powder, 1.10g Ta 2 O 5 Powder, 0.66g Nb 2 O 5 Powder, 0.42g of C powder and 0.77g of B 4 C powder was placed in a 150ml teflon ball mill and added with 88.00g ZrO 2 Ball mill (the molar ratio of Hf, Ti, Nb and Ta in the raw material is 1:1:1:1, and the TiO in the raw material is 2 Powder, HfO 2 Powder, Nb 2 O 5 Powder and Ta 2 O 5 The molar ratio of the total amount of powder to C powder is 1:2.33, TiO 2 Powder, HfO 2 Powder, Nb 2 O 5 Powder and Ta 2 O 5 The total amount of powder and B 4 The molar ratio of C powder is 1:0.93, and the mass ratio of ball milling beads to raw materials is 19.3:1). The ball mill tank is placed in a ball mill and ball milled at a speed of 500r / min for 20h to obtain mixed powder;

[0037] Put the mixed powder obtained in the step (1) into a graphite crucible with a...

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Abstract

The invention discloses (Hf,Ta,Nb,Ti)B2 high-entropy ceramic powder and a preparing method thereof. The preparing method comprises the steps of 1, weighing HfO2 powder, TiO2 powder, Nb2O5 powder, Ta2O5 powder, B4C powder and C powder as raw materials, then mixing the raw materials, and grinding the raw materials to obtain mixed powder; 2, sintering the mixed powder obtained in step 1, introducinginert gas in the sintering process, conducting cooling after sintering is finished, and finally, obtaining the (Hf,Ta,Nb,Ti)B2 high-entropy ceramic powder. The method has the advantages that the process is simple, the production cost is low, the synthesized powder is fine in crystal grain, uniform in distribution and high in purity, and the oxygen content is lower than 0.53 wt%, all of which endowthe method with the potential of developing large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of high-entropy material preparation, in particular to a (Hf, Ta, Nb, Ti) B 2 High-entropy ceramic powder and preparation method thereof. Background technique [0002] In the late 1990s, Professor Ye Junwei from Tsinghua University, Taiwan, proposed the concept of high-entropy alloys. Compared with traditional alloys, high-entropy alloys have higher specific strength, fracture resistance, tensile strength, corrosion resistance and oxidation resistance. Inspired by the concept of high-entropy alloys, high-entropy ceramics, as a new type of ceramic materials, have received extensive attention in recent years due to their potential excellent properties. The high-entropy ceramics currently studied mainly include high-entropy oxides, carbides, nitrides and borides. Among them, high-entropy borides have broad development potential in the fields of ultra-high temperature, biomedicine, and energy due to their hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
CPCC04B35/58064C04B35/58071C04B35/58078C04B35/62645C04B35/6265C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3821C04B2235/422
Inventor 褚衍辉刘达叶贝琳
Owner SOUTH CHINA UNIV OF TECH
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