Porous rare-earth zirconate powder for plasma physical vapor deposition thermal barrier coating and preparation method thereof

A technology of physical vapor deposition and thermal barrier coating, applied in applications, household utensils, ceramic products, etc., can solve the problems of unstable spray powder phase composition, large particle size of granulated powder, low deposition efficiency, etc., and achieve good high temperature resistance Oxidation and thermal corrosion resistance, low crushing strength, and high purity

Active Publication Date: 2018-10-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems that the micron and nanometer rare earth zirconate powders produced in the prior art have small particle size, poor fluidity, low deposition efficiency or large particle size of granulated powder, it is difficult to gasify, and the phase composition of the sprayed powder is unstable. The present invention provides a Rare earth zirconate powder for plasma physical vapor deposition and preparation method thereof

Method used

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  • Porous rare-earth zirconate powder for plasma physical vapor deposition thermal barrier coating and preparation method thereof
  • Porous rare-earth zirconate powder for plasma physical vapor deposition thermal barrier coating and preparation method thereof
  • Porous rare-earth zirconate powder for plasma physical vapor deposition thermal barrier coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Step 1: First ball milling: Mix gadolinia and zirconia at a molar ratio of 1.1:2, the purity of the oxides (zirconia, gadolinia) used is >99.9%, and the particle size is 5-9 μm. Put the mixed powder into the ball mill jar, and add alcohol and zirconia balls for the first ball mill. The mixed powder, zirconia balls and alcohol were mixed, the mixing mass ratio was 1:1.5:2, the rotational speed of the ball mill was 300r / min, and the ball milling time was 24h to obtain the first suspension.

[0041] Step 2: Sintering to form a phase: put the first suspension described in Step 1 (the particle size is 0.7-1 μm measured by a laser particle size tester) into an oven for drying: the temperature is 80 ° C, and the time is 10 h; The obtained powder is put into a high-temperature box furnace for sintering to obtain a pyrochlore structure. The sintering temperature is 1550°C and the time is 14h;

[0042] Step 3: The second ball mill after adding the filler: mix the pyrochlore str...

Embodiment 2

[0053] Step 1: First ball milling: Mix lanthanum oxide and zirconia at a molar ratio of 1.15:2, the purity of the oxides (zirconia, lanthanum oxide) used is >99.9%, and the particle size is 5-7 μm. Put the mixed powder into the ball mill jar, add alcohol and zirconia balls, mix the mixed powder, zirconia balls and alcohol, the mixing mass ratio is 1:2:2, and perform the first ball mill. The rotational speed of the ball mill was 400 r / min, and the ball milling time was 18 hours to obtain the first suspension.

[0054] Step 2: Sintering to form a phase: Put the first suspension described in Step 1 (the particle size is 0.7-3 μm as measured by a laser particle size tester) into an oven for drying: the temperature is 80 ° C, and the time is 8 hours; The obtained powder is put into a high-temperature box furnace for sintering to obtain a pyrochlore structure. The sintering temperature is 1550°C, and the time is 10h;

[0055] Step 3: The second ball mill after adding the filler: M...

Embodiment 3

[0063]Step 1: The first ball mill: mix gadolinium oxide, zirconium oxide, and ytterbium oxide at a molar ratio of 1.1:2:0.88, the purity of the oxides (zirconia, gadolinium oxide, and ytterbium oxide) >99.9%, and the particle size is 5 ~9 μm. Put the mixed powder into the ball mill jar, add alcohol and zirconia balls, mix the mixed powder, zirconia balls and alcohol, the mixing mass ratio is 1:1.5:3, and perform the first ball milling. The rotational speed of the ball mill was 300 r / min, and the ball milling time was 36 hours to obtain the first suspension.

[0064] Step 2: Sintering to form a phase: Put the first suspension described in Step 1 (the particle size is 0.7-1 μm as measured by a laser particle size tester) into an oven for drying: the temperature is 80 ° C, and the time is 8 hours; The obtained powder is put into a high-temperature box furnace for sintering to obtain a pyrochlore structure. The sintering temperature is 1600°C and the time is 15h;

[0065] Step ...

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Abstract

The invention discloses porous rare-earth zirconate powder for a plasma physical vapor deposition thermal barrier coating and a preparation method thereof and belongs to the technical field of preparation of oxide ceramic materials and thermal barrier coating protection. The preparation method disclosed by the invention comprises the following steps: firstly, mixing rare-earth oxide and zirconiumoxide powder according to a ratio; carrying out ball milling on a mixture and a solvent medium A, so as to obtain first suspension liquid; then drying and sintering to obtain a phase; then adding a solvent medium B and carrying out second-time ball milling to obtain second suspension liquid; then mixing the suspension liquid with a binding agent and granulating to obtain micron agglomerated spherical powder; finally, after sieving and grading, carrying out low-temperature heat treatment to obtain the porous rare-earth zirconate powder. The powder provided by the invention has high-temperaturephase stability, good thermal corrosion resisting performance, high purity, high sphericity, good flowability and low crushing strength, and high deposition efficiency; a preparation technology is convenient and equipment is simple; enlarged production is easy to realize and the cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of oxide ceramic material preparation and thermal barrier coating protection, and relates to a porous rare earth zirconate powder for plasma physical vapor deposition thermal barrier coating and a preparation method thereof. Background technique [0002] With the development of engines with high thrust-to-weight ratio and high flow rate, the operating temperature of engine turbine blades is getting higher and higher, which may reach 1400°C, while the temperature limit of superalloys has reached 1100°C, so the existence of thermal barrier coatings appears Particularly important. [0003] Thermal barrier coatings, also known as TBCs, is a thermal protection technology that combines high temperature resistant, low thermal conductivity, and corrosion resistant ceramic materials with metal substrates to reduce the temperature of metal surfaces in high temperature environments. It is an advanced gas turbine engine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/486C04B35/622C04B35/626
CPCC04B35/486C04B35/622C04B35/62605C04B35/62645C04B35/62695C04B38/067C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/77C04B2235/95C04B38/0067
Inventor 郭洪波李珊彭徽魏亮亮
Owner BEIHANG UNIV
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