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Method for preparing perovskite type composite oxide high-entropy ceramic through hot pressed sintering

A composite oxide and perovskite type technology, applied in the field of high-entropy ceramic materials, can solve the problems of large ceramic grains, high sintering temperature, and low density, and achieve small grains, large sintering driving force, and high density. high effect

Active Publication Date: 2020-02-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering temperature of this method is high, reaching 1500 ° C; the ceramic grains prepared by the solid-state sintering method are large and the density is low

Method used

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  • Method for preparing perovskite type composite oxide high-entropy ceramic through hot pressed sintering
  • Method for preparing perovskite type composite oxide high-entropy ceramic through hot pressed sintering
  • Method for preparing perovskite type composite oxide high-entropy ceramic through hot pressed sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to Sr(Zr 0.2 sn 0.2 Ti 0.2 f 0.2 Nb 0.2 )O 3According to the stoichiometric ratio of the total amount of 40g, strontium carbonate and other metal oxides were weighed respectively, and added to the nylon tank; with absolute ethanol as the ball milling medium, mixed and ball milled on the planetary ball mill for 36 hours, every ball milled for 30 minutes, and stopped for 10 minutes. Minutes; dry at 100°C to obtain the raw material precursor; pre-fire the raw material precursor at 1000°C for 2 hours, grind, pass through a 200-mesh sieve, put it into a high-strength graphite mold, put it into a hot-press furnace, and vacuumize the furnace Internal vacuum reaches 10 -2 Pa; start to heat up from room temperature at a rate of 20°C / min. When the furnace temperature rises to 500°C, the loaded pressure reaches 15MPa; the sintering temperature is 1250°C, and the holding time is 120 minutes; when the holding time reaches 90 minutes, start Decrease the pressure at a ...

Embodiment 2

[0035] According to Sr(Zr 0.2 sn 0.2 Ti 0.2 f 0.2 Tb 0.2 )O 3 According to the stoichiometric ratio of the total amount of 40g, strontium carbonate and other metal oxides were weighed respectively, and added to the nylon tank; with absolute ethanol as the ball milling medium, mixed and ball milled on the planetary ball mill for 36 hours, every ball milled for 30 minutes, and stopped for 10 minutes. Minutes; dry at 100°C to obtain the raw material precursor; pre-fire the raw material precursor at 1000°C for 2 hours, grind, pass through a 200-mesh sieve, put it into a high-strength graphite mold, put it into a hot-press furnace, and vacuumize the furnace Internal vacuum reaches 10 -2 Pa; start to heat up from room temperature at a rate of 20°C / min, and when the furnace temperature rises to 500°C, the loaded pressure reaches 15MPa; the sintering temperature is 1200°C, and the holding time is 120 minutes; when the holding time reaches 90 minutes, start Decrease the pressure ...

Embodiment 3

[0037] According to Sr(Zr 0.2 sn 0.2 Ti 0.2 f 0.2 Ta 0.2 )O 3 According to the stoichiometric ratio of the total amount of 40g, strontium carbonate and other metal oxides were weighed respectively, and added to the nylon tank; with absolute ethanol as the ball milling medium, mixed and ball milled on the planetary ball mill for 36 hours, every ball milled for 30 minutes, and stopped for 10 minutes. Minutes; dry at 100°C to obtain the raw material precursor; pre-fire the raw material precursor at 1000°C for 2 hours, grind, pass through a 200-mesh sieve, put it into a high-strength graphite mold, put it into a hot-press furnace, and vacuumize the furnace Internal vacuum reaches 10 -2 Pa; start to heat up from room temperature at a rate of 20°C / min, and when the furnace temperature rises to 500°C, the loaded pressure reaches 15MPa; the sintering temperature is 1200°C, and the holding time is 120 minutes; when the holding time reaches 90 minutes, start Decrease the pressure ...

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Abstract

The invention belongs to the field of high-entropy ceramic materials and particularly discloses a method for preparing perovskite type composite oxide high-entropy ceramic through hot pressed sintering. The A position of the perovskite type composite oxide high-entropy ceramic is occupied by Sr, and the B position of the perovskite type composite oxide high-entropy ceramic is composed of Zr, Sn, Ti, Hf elements and any one selected from the group consisting of Nb, Ta, Mn and Tb elements in a nearly equal molar ratio. The Sr(Zr<0.2>Sn<0.2>Ti<0.2>Hf<0.2>M<0.2>)O<3> (wherein M is Nb, Ta, Mn or Tb) composite oxide high-entropy ceramic material is prepared by adopting a hot pressed sintering technology, and the prepared ceramic material is submicron-sized in crystal grain, compact in structure,simple in preparation process and short in period.

Description

technical field [0001] The invention belongs to the field of high-entropy ceramic materials, and in particular relates to a method for preparing perovskite-type composite oxide high-entropy ceramics by hot pressing and sintering. Background technique [0002] High-entropy ceramics have the characteristics of high thermal conductivity, high melting point, good corrosion resistance and electrochemical performance. It is a new type of ceramic material developed on the basis of high-entropy alloys in recent years. It is used in ultra-high temperature materials and new energy materials field has potential application value. Since the concept of high entropy was first proposed in 1995, only a few structures of high entropy oxide ceramics have been successfully synthesized. [0003] Perovskite-type composite oxides are a type of compound with the same structure as perovskite, which can be used in ABO 3 It means that the A site is an alkaline earth element, and the cation has a 12...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/645
CPCC04B35/01C04B35/645C04B2235/3213C04B2235/3224C04B2235/3249C04B2235/3251C04B2235/3262C04B2235/3293
Inventor 闫桂炜陈智慧任玉荣邱建华朱媛媛
Owner CHANGZHOU UNIV
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