CN115403382A - High-entropy yttrium salt ceramic material for thermal barrier coating and preparation method and application thereof - Google Patents
High-entropy yttrium salt ceramic material for thermal barrier coating and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a high-entropy yttrium salt ceramic material for a thermal barrier coating, and a preparation method and application thereof, and belongs to the technical field of thermal protection ceramic materials. The chemical formula of the high-entropy yttrium salt ceramic material provided by the invention is Sr (5 RE) 0.2 ) 2 O 4 And the RE is four or five of Y element and other rare earth elements except the radioactive element Pm, and the quantity of the five RE substances is the same. According to the invention, other four rare earth elements are introduced into the yttrium salt structure, so that the lattice distortion degree of yttrium salt can be increased, the phonon scattering of yttrium salt is enhanced, the thermal conductivity of yttrium salt is reduced, the high-entropy yttrium salt ceramic material for the thermal barrier coating is ensured to have the characteristics of high phase stability and low thermal conductivity, and the high-entropy yttrium salt ceramic material has a wide application prospect in the field of thermal barrier coating materials.
Description
Technical Field
The invention relates to the technical field of thermal protection ceramic materials, in particular to a high-entropy yttrium salt ceramic material for a thermal barrier coating and a preparation method and application thereof.
Background
The thermal barrier coating is a heat-insulating functional coating applied to the surfaces of hot-end components of aeroengines and ground gas turbines, and provides thermal protection mainly through a low-heat-conductivity ceramic layer on the surface layer. In recent years, the requirements of thermal barrier coating on heat insulation, thermal stability and other performances are gradually increased for increasingly harsh service environments. The development of new thermal barrier coating materials has become a recognized method for improving the service performance of hot end component materials.
Strontium yttrium oxide is one of potential thermal barrier coating materials due to the advantages of good high-temperature stability, high thermal expansion coefficient and the like, and the short plate applied in the direction is the material with high thermal conductivity. The researchers have studied and reported the thermal conductivity of strontium yttrium acid, and the thermal conductivity is 3.4 W.m at 1000 DEG C -1 ·K -1 . The thermal conductivity is higher than the thermal conductivity (< 2 W.m) required by a thermal barrier coating material -1 ·K -1 1000 deg.c) and therefore reducing the thermal conductivity of the material is an important step in facilitating the application of the material on thermal barrier coatings.
Disclosure of Invention
The invention aims to provide a high-entropy yttrium salt ceramic material for a thermal barrier coating, and a preparation method and application thereof, aiming at the defects of the prior art.
The invention relates to a high-entropy yttrium salt ceramic material for a thermal barrier coating, which has a chemical formula of Sr (5 RE) 0.2 ) 2 O 4 The RE is four or five RE elements in Y element and other rare earth elements except radioactive element Pm with the same amount.
Furthermore, the atomic scale difference delta of the five rare earth elements is less than or equal to 6.6 percent.
Further, the chemical formula is Sr (Y) 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 。
The preparation method of the high-entropy yttrium salt ceramic material for the thermal barrier coating comprises the following steps: according to the element composition of the chemical formula of the high-entropy yttrium salt ceramic material for the thermal barrier coating, the rare earth oxide powder and the strontium carbonate powder are mixed and calcined to obtain the high-entropy yttrium salt ceramic material for the thermal barrier coating.
Further, the method for mixing the rare earth oxide powder and the strontium carbonate powder comprises the following steps: mixing rare earth oxide powder, strontium carbonate, a solvent and a ball milling medium, then carrying out ball milling, carrying out solid-liquid separation on the obtained slurry, and sieving and drying the obtained solid material.
Further, the ball milling rotating speed is 1000-3000 rpm; the ball milling time is 4-20 h; grinding medium is 0.3-1 mm zirconium oxide balls; the number of the sieving meshes is 200-400 meshes.
Further, the solvent is one of ethanol, isopropanol, glycerol or n-butanol.
Further, the calcination is carried out in an air atmosphere without pressure.
Furthermore, the calcining temperature is 850-1350 ℃, and the time is 10-100 h.
The high-entropy yttrium salt ceramic material for the thermal barrier coating is applied to the thermal barrier coating material.
According to the invention, other four rare earth elements are introduced into the yttrium salt structure, so that the lattice distortion degree of yttrium salt can be increased, the phonon scattering of yttrium salt is enhanced, the thermal conductivity of yttrium salt is reduced, the high-entropy yttrium salt ceramic material for the thermal barrier coating is ensured to have the characteristics of high phase stability and low thermal conductivity, and the high-entropy yttrium salt ceramic material has a wide application prospect in the field of thermal barrier coating materials.
The high-entropy yttrium salt ceramic synthesized by the invention belongs to a brand-new material, not only fills up the blank of research on the high-entropy yttrium salt ceramic and enriches the material system, but also has great application potential in the aspect of thermal barrier coating materials due to excellent material performance.
The high-entropy yttrium salt ceramic material is successfully synthesized by the preparation method, and the synthesized high-entropy yttrium salt ceramic material has good phase stability, higher thermal expansion coefficient and lower thermal conductivity. As for the effect of regulating and controlling the thermal conductivity, the results of the examples show that the high-entropy yttrium salt ceramic material for the thermal barrier coating provided by the invention has the thermal conductivity lower than 2 W.m at the temperature of more than 1000 DEG C -1 ·K -1 Meets the use requirement of a thermal barrier coating, and has the thermal conductivity of only 1.6 W.m at 1500 DEG C -1 ·K -1 . In addition, the average thermal expansion coefficient of the yttrium salt high-entropy ceramic material is 11.53 multiplied by 10 -6 K -1 This is also superior to the yttrium stabilized zirconia materials (10.5-11X 10) which are currently widely used -6 K -1 )。
Drawings
FIG. 1 is an X-ray diffraction spectrum of the high-entropy yttrium salt ceramic material powder prepared in example 1;
FIG. 2 is an X-ray diffraction pattern of the high entropy yttrium salt ceramic material powder prepared in example 2 sintered at 1600 ℃ for 10h, 50h;
FIG. 3 is a graph of the thermal conductivity of a block of high entropy yttrium oxide ceramic material prepared in example 3;
FIG. 4 is a graph of the coefficient of thermal expansion of the bulk of the high entropy yttrium oxide ceramic material prepared in example 4.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown.
Example 1:
preparation of a compound of the formula Sr (Y) 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 The high-entropy ceramic powder material comprises the following steps:
will Y 2 O 3 、Sm 2 O 3 、Gd 2 O 3 、Dy 2 O 3 、Yb 2 O 3 And SrCO 3 According to Y 2 O 3 :Sm 2 O 3 :Gd 2 O 3 :Dy 2 O 3 :Yb 2 O 3 :SrCO 3 =1:1:1:1:1:5, adding the raw material powder and isopropanol into a zirconia ball milling tank for ball milling, wherein the addition amount of the isopropanol is proper for immersing the raw material powder, and the ball milling time is 10 hours to obtain slurry; filtering the slurry to obtain solidPutting the materials into a 65 ℃ oven for drying to obtain a mixed powder material, putting the mixed powder material into a high-temperature box type furnace, carrying out pressureless calcination for 10h at the temperature of 1150 ℃, cooling to room temperature (25 ℃) along with the furnace, and grinding the obtained material to obtain Sr (Y) with a chemical formula 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 The high entropy ceramic material powder.
Through tests, fig. 1 is an X-ray diffraction spectrum of the high-entropy ceramic material powder prepared in example 1, and as can be seen from fig. 1, the high-entropy ceramic material powder prepared in example 1 is a pure-phase orthogonal structure.
Example 2:
preparation of a compound of the formula Sr (Y) 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 The high-entropy ceramic powder material comprises the following steps:
will Y 2 O 3 、Sm 2 O 3 、Gd 2 O 3 、Dy 2 O 3 、Yb 2 O 3 And SrCO 3 According to Y 2 O 3 :Sm 2 O 3 :Gd 2 O 3 :Dy 2 O 3 :Yb 2 O 3 :SrCO 3 =1:1:1:1:1:5, adding the raw material powder and isopropanol into a zirconia ball milling tank for ball milling, wherein the addition amount of the isopropanol is proper for immersing the raw material powder, and the ball milling time is 10 hours to obtain slurry; filtering the slurry, putting the obtained solid material into a 65 ℃ oven for drying to obtain a mixed powder material, putting the mixed powder material into a high-temperature box type furnace, carrying out pressureless calcination for 10h at the temperature of 1150 ℃, cooling to room temperature (25 ℃) along with the furnace, and grinding the obtained material to obtain Sr (Y) with a chemical formula 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 The high entropy ceramic material powder. Subsequently, it was mixed uniformly with 5wt% PVA, press-formed on an isostatic press at 100MPa pressure, and then fired at 1600 ℃ under atmospheric pressure for 10h and 50h, respectively, followed by grinding to obtain a mixture of PVA in this sintering conditionTwo kinds of powder.
By testing, FIG. 2 shows the X-ray diffraction pattern of the high entropy yttrium oxide ceramic material powder prepared in example 2 sintered at 1600 ℃ for 10h, 50h. As can be seen from fig. 2, the high-entropy yttrium oxide ceramic material prepared in example 2 has a pure-phase orthorhombic structure and is stable in phase at the temperature.
Example 3:
preparation of a compound of the formula Sr (Y) 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 The high-entropy ceramic block material comprises the following steps:
will Y 2 O 3 、Sm 2 O 3 、Gd 2 O 3 、Dy 2 O 3 、Yb 2 O 3 And SrCO 3 According to Y 2 O 3 :Sm 2 O 3 :Gd 2 O 3 :Dy 2 O 3 :Yb 2 O 3 :SrCO 3 =1:1:1:1:1:5, adding the raw material powder and isopropanol into a zirconia ball milling tank for ball milling, wherein the addition amount of the isopropanol is proper for immersing the raw material powder, and the ball milling time is 10 hours to obtain slurry; filtering the slurry, putting the obtained solid material into a 65 ℃ oven for drying to obtain a mixed powder material, putting the mixed powder material into a high-temperature box type furnace, carrying out pressureless calcination for 10h at the temperature of 1150 ℃, cooling to room temperature (25 ℃) along with the furnace, and grinding the obtained material to obtain Sr (Y) with a chemical formula 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 Then sintering the powder into a block under the conditions of 1500 ℃ and 30MPa by spark plasma sintering.
Through testing, the high-entropy ceramic material block prepared by the embodiment also has a pure-phase orthogonal structure, and the X-ray diffraction pattern of the block is consistent with that of a standard card; FIG. 3 shows the thermal conductivity of the high-entropy ceramic material prepared in example 3, and it can be seen from FIG. 3 that the high-entropy ceramic material prepared in example 3 has a thermal conductivity of less than 2 W.m at 1000 ℃ or higher -1 ·K -1 In accordance with thermal barrierThe thermal conductivity of the coating is 1.6 W.m at 1500 DEG C -1 ·K -1 。
Example 4:
preparation of a compound of the formula Sr (Y) 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 The high-entropy ceramic block material comprises the following steps:
will Y 2 O 3 、Sm 2 O 3 、Gd 2 O 3 、Dy 2 O 3 、Yb 2 O 3 And SrCO 3 According to Y 2 O 3 :Sm 2 O 3 :Gd 2 O 3 :Dy 2 O 3 :Yb 2 O 3 :SrCO 3 =1:1:1:1:1:5, adding the raw material powder and isopropanol into a zirconia ball milling tank for ball milling, wherein the addition amount of the isopropanol is proper for immersing the raw material powder, and the ball milling time is 10 hours to obtain slurry; filtering the slurry, putting the obtained solid material into a 65 ℃ oven for drying to obtain a mixed powder material, putting the mixed powder material into a high-temperature box type furnace, carrying out pressureless calcination for 10h at the temperature of 1150 ℃, cooling to room temperature (25 ℃) along with the furnace, and grinding the obtained material to obtain Sr (Y) with a chemical formula 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 Then, the high-entropy ceramic material powder is uniformly mixed with 5wt% of PVA, is pressed and formed on an isostatic pressing tablet machine under the pressure of 100MPa, and is fired at the temperature of 1600 ℃ under normal pressure for 10 hours to obtain a ceramic block.
Through testing, the high-entropy ceramic material block prepared by the embodiment also has a pure-phase orthogonal structure, and the X-ray diffraction pattern of the block is consistent with that of a standard card; FIG. 4 is a thermal expansion coefficient chart of the high-entropy ceramic material obtained in example 4, and it can be seen from FIG. 4 that the thermal expansion coefficient of the high-entropy ceramic material obtained in example 4 is 11.53X 10 at 1500 ℃ -6 K -1 And has higher thermal expansion coefficient.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A high-entropy yttrium salt ceramic material for thermal barrier coating is characterized in that the chemical formula is Sr (5 RE) 0.2 ) 2 O 4 And the RE is four or five of Y element and other rare earth elements except the radioactive element Pm, and the quantity of the five RE substances is the same.
2. A high entropy yttrium oxide ceramic material for thermal barrier coating according to claim 1, characterized in that the difference of atomic scale δ of five rare earth elements is less than or equal to 6.6%.
3. The high-entropy yttrium-oxide ceramic material for thermal barrier coating of claim 1, which has a chemical formula of Sr (Y) 0.2 Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 ) 2 O 4 。
4. A method of producing a high entropy yttrium oxide ceramic material for use in a thermal barrier coating according to any one of claims 1 to 3, characterized by comprising the steps of: according to the element composition of the chemical formula of the high-entropy yttrium salt ceramic material for the thermal barrier coating, the rare earth oxide powder and the strontium carbonate powder are mixed and then calcined to obtain the high-entropy yttrium salt ceramic material for the thermal barrier coating.
5. The method of claim 4, wherein the mixing of the rare earth oxide powder with the strontium carbonate powder comprises: mixing rare earth oxide powder, strontium carbonate, a solvent and a ball milling medium, then carrying out ball milling, carrying out solid-liquid separation on the obtained slurry, and sieving and drying the obtained solid material.
6. The preparation method according to claim 5, wherein the ball milling rotation speed is 1000 to 3000rpm; the ball milling time is 4-20 h; grinding medium is 0.3-1 mm zirconium oxide balls; the number of the sieving meshes is 200-400 meshes.
7. The method according to claim 5, wherein the solvent is one of ethanol, isopropanol, glycerol, and n-butanol.
8. The method of claim 4, wherein the calcination is a pressureless atmosphere calcination.
9. The method according to claim 4, wherein the calcination is carried out at 850 to 1350 ℃ for 10 to 100 hours.
10. Use of a high entropy yttrium oxide ceramic material for thermal barrier coating according to any one of claims 1 to 3 in a thermal barrier coating material.
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CN116730730A (en) * | 2023-03-22 | 2023-09-12 | 中国地质大学(武汉) | High-entropy rare earth zirconate thermal barrier coating material with high thermal expansion coefficient and preparation method thereof |
CN117701044A (en) * | 2023-12-08 | 2024-03-15 | 北矿新材科技有限公司 | Multiphase dysprosium doped zirconia sealing coating, preparation method thereof and device with high abrasion performance |
CN117684115A (en) * | 2023-12-12 | 2024-03-12 | 杭钢金属陶瓷(安吉)有限公司 | Multi-element high-entropy stable yttrium oxide thermal barrier coating material and preparation method thereof |
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