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Preparation method of dense rare earth tantalate high temperature ceramic

A technology of high-temperature ceramics and tantalate, applied in the field of high-temperature materials, can solve the problems of low operating temperature, low thermal expansion coefficient, and high thermal conductivity of YSZ, and achieve controllable crystal structure, low thermal diffusivity and thermal conductivity, and high purity high effect

Active Publication Date: 2018-01-19
陕西天璇涂层科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently widely used are mainly yttria stabilized zirconia (YSZ) and rare earth zirconates (RE 2 Zr 2 o 7 ), etc., but there are certain deficiencies: YSZ has a low operating temperature (≦1200°C), and relatively high thermal conductivity (2.5W.m -1 k -1 ); while RE 2 Zr 2 o 7 Then there is the problem of low thermal expansion coefficient
There is still a lack of research on rare earth tantalates (RE 3 TaO 7 ) research on the preparation and thermodynamic properties of dense bulk samples

Method used

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  • Preparation method of dense rare earth tantalate high temperature ceramic
  • Preparation method of dense rare earth tantalate high temperature ceramic
  • Preparation method of dense rare earth tantalate high temperature ceramic

Examples

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Effect test

Embodiment 1

[0023] Embodiment 1: A kind of preparation method of dense rare earth tantalate high-temperature ceramics, the specific steps are:

[0024] (1) According to the rare earth tantalate (neodymium tantalate Nd 3 TaO 7 ) The stoichiometric ratio weighs the rare earth oxide (NdO Nd 2 o 3 ) and tantalum pentoxide, and then the material rare earth oxide (neodymium oxide Nd 2 o 3 ), tantalum pentoxide, titanium oxide, and copper oxide are mixed by ball milling to obtain mixed powder A; wherein in mass percentage, titanium dioxide 3% and copper oxide 5% in mixed powder A; the mass ratio of material to grinding ball is 4: 1. The ball milling speed is 200 r / min, and the ball milling time is 8 h;

[0025] (2) Pass the mixed powder A obtained in step (1) through a 100-mesh sieve and put it in a mold for compaction. The compacted holding pressure is 4MPa, and the holding time is 3 minutes. Conductive ceramics conduct electricity, and then place them in a spark plasma sintering furnace ...

Embodiment 2

[0026] Embodiment 2: A kind of preparation method of dense rare earth tantalate high-temperature ceramics, the specific steps are:

[0027] (1) According to the rare earth tantalate (samarium tantalate Sm 3 TaO 7 ) The stoichiometric ratio weighs the rare earth oxide (Samarium NdO 2 o 3 ) and tantalum pentoxide, and then the material rare earth oxide (samarium tantalate Sm 3 TaO 7 ), tantalum pentoxide, titanium oxide, and copper oxide are mixed by ball milling to obtain mixed powder A; wherein, in mass percentage, titanium dioxide 5% and copper oxide 5% in mixed powder A; the mass ratio of material to grinding ball is 4: 1. The ball milling speed is 250 r / min, and the ball milling time is 6 h;

[0028] (2) Pass the mixed powder A obtained in step (1) through a 100-mesh sieve and place it in a mold for compaction. The compacted holding pressure is 5 MPa, and the holding time is 3 minutes. Conductive ceramics are conductive, and then placed in a spark plasma sintering fur...

Embodiment 3

[0033] Embodiment 3: A kind of preparation method of dense rare earth tantalate high-temperature ceramics, the specific steps are:

[0034] (1) According to the rare earth tantalate (Eu tantalate Eu 3 TaO 7 ) stoichiometric ratio Weigh the rare earth oxide (europium oxide) and tantalum pentoxide, and then ball mill and mix the materials rare earth oxide (europium oxide), tantalum pentoxide, titanium oxide, and copper oxide to obtain mixed powder A Wherein in mass percentage, titanium dioxide 3% in mixed powder A, copper oxide 8%; the mass ratio of material and ball is 4:1, ball milling speed is 300 r / min, ball milling time is 4 h;

[0035] (2) Pass the mixed powder A obtained in step (1) through a 100-mesh sieve and put it in the mold for compaction. The compacted holding pressure is 6MPa, and the holding time is 2 minutes. Conductive ceramics conduct electricity, and then place them in a spark plasma sintering furnace for pressure-holding sintering to obtain dense rare eart...

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Abstract

The invention relates to a preparation method of dense rare earth tantalate high temperature ceramic and belongs to the technical field of high temperature materials. The preparation method comprisesweighing rare earth oxide RE2O3 and tantalum pentoxide according to the stoichiometric ratio of rare earth tantalate RE3TaO7, carrying out ball milling mixing on the rare earth oxide RE2O3, tantalum pentoxide, titanium oxide and copper oxide to obtain uniform mixed powder A, screening the mixed powder A, putting the mixed powder A into a mold, carrying out compaction, carrying out carbon sprayingtreatment and carrying out pressure-keeping sintering to obtain the dense rare earth tantalate high temperature ceramic. The dense rare earth tantalate high temperature ceramic has the characteristicsof high process purity, less impurity content, high compactness and uniform crystal grain size.

Description

technical field [0001] The invention relates to a preparation method of dense rare earth tantalate high-temperature ceramics, belonging to the technical field of high-temperature materials. Background technique [0002] Thermal barrier coatings are mainly used in the aero-engine industry. They have the advantages of low thermal conductivity, high thermal expansion coefficient, anti-sintering, and good high-temperature stability. Particle impact to protect the parts of the high-temperature area of ​​the aero-engine. Currently widely used are mainly yttria stabilized zirconia (YSZ) and rare earth zirconates (RE 2 Zr 2 o 7 ), etc., but there are certain deficiencies: YSZ has a low operating temperature (≦1200°C), and relatively high thermal conductivity (2.5W.m -1 k -1 ); while RE 2 Zr 2 o 7 Then there is a problem that the coefficient of thermal expansion is low. Many oxide ceramics with excellent thermal properties have been discovered, such as rare earth cerates (RE...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B35/645
Inventor 冯晶陈琳葛振华
Owner 陕西天璇涂层科技有限公司
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