Rare earth doped zirconia pressure transmitting medium, its preparation method and application

Abstract

The application discloses the field of ceramic materials, and discloses a rare earth doped zirconium oxide pressure transmission medium and a preparation method and application thereof. The preparation method comprises the following steps: firstly, uniformly mixing yttrium oxide, zirconium oxide powder and cerium oxide powder to obtain rare earth co-doped zirconium oxide powder; secondly, pressing and forming the rare earth co-doped zirconium oxide powder to obtain a first rare earth co-doped zirconium oxide blank; thirdly, sintering the pressed and formed first rare earth co-doped zirconium oxide blank to obtain a primary sintering product; fourthly, crushing, grinding and sieving the primary sintering product to obtain rare earth co-doped zirconium oxide particles with different particle sizes; fifthly, adding the rare earth co-doped zirconium oxide particles with different particle sizes into a forming mold to press and form a second rare earth co-doped zirconium oxide blank; and finally, sintering the pressed and formed second rare earth co-doped zirconium oxide blank to obtain a rare earth co-doped zirconium oxide ceramic. The yttrium oxide and the cerium oxide are doped into the zirconium oxide, and the preparation process is optimized, so that the zirconium oxide ceramic with high heat preservation performance and pressure transmission performance is prepared.

Description

Technical Field

[0001] This invention belongs to the field of ceramic materials, and relates to a zirconia ceramic, and more particularly to a rare earth-doped zirconia pressure transmission medium, its preparation method and application. Background Technology

[0002] Zirconia ceramics possess advantages such as high toughness, high flexural strength, high wear resistance, excellent thermal insulation properties, and a thermal expansion coefficient close to that of steel, making them widely used in the field of structural ceramics. Furthermore, their excellent high-temperature resistance allows them to be used as induction heating tubes, refractory materials, and heating elements. With a high melting point (approximately 2700℃ under normal pressure) and excellent thermal insulation properties, zirconia is often used as a thermal insulation material under high-temperature and high-pressure conditions. However, pure zirconia undergoes a reversible phase transformation from a monoclinic phase (m) to a tetragonal phase (t) at 1170℃. That is, above 1170℃, the m phase ZrO2 transforms into the t phase ZrO2. Simultaneously, at low temperatures, the t phase ZrO2 also transforms back into the m phase, accompanied by a 5% volume change during the phase transformation, which easily causes cracking in the material. This limits the use of zirconia ceramics as a thermal insulation material under high-temperature conditions.

[0003] Currently, to overcome the problem of phase transformation volume change cracking in zirconia at high temperatures, calcium oxide and magnesium oxide are typically added as stabilizers to zirconia ceramics. This stabilizes the zirconia in the tetragonal (t) and cubic (c) phases after high-temperature sintering, preventing phase transformation during heating and thus improving the material's stability. With the increasing demand for thermal insulation performance, zirconia with lower thermal conductivity and superior insulation properties has become an important development direction, and rare earth doping is one of the key methods.

[0004] Meanwhile, zirconia, as an important thermal insulation material, has wide applications in high-temperature and high-pressure experiments. The preparation of zirconia materials that simultaneously possess high thermal insulation and excellent pressure transmission properties is crucial for these experiments. Currently, commonly used zirconia materials in high-temperature and high-pressure experiments include imported Japanese zirconia and domestically produced CaO-stabilized zirconia. Japanese zirconia is expensive, while domestically produced CaO-stabilized zirconia suffers from severe ceramization and high structural strength during use, leading to difficulties in processing and significant pressure loading consumption during high-pressure experiments, resulting in lower achievable chamber pressures. This invention discloses a method using yttrium oxide and cerium oxide to prepare rare-earth co-doped zirconia materials to meet the performance requirements of zirconia ceramic materials for temperature insulation and pressure transmission in high-temperature and high-pressure experiments. Summary of the Invention

[0005] In high-temperature and high-pressure experiments, achieving higher temperatures within the cavity requires insulation materials with superior thermal insulation properties. Currently, domestically produced calcium oxide-stabilized zirconia is commonly used in high-temperature and high-pressure experiments. However, using calcium oxide-stabilized zirconia as an insulation and pressure-transfer medium in high-temperature and high-pressure experiments faces two major problems: low pressure transmission efficiency and low temperature generation efficiency, which limit the maximum temperature and pressure conditions achievable in high-temperature and high-pressure experiments. To address these technical problems, this invention provides a rare-earth-doped zirconia pressure-transfer medium and its preparation method. By using rare-earth doping, the phonon scattering of zirconia ceramics is intensified, thereby improving its thermal insulation performance. Simultaneously, by employing different particle sizes of rare-earth zirconia ceramics in varying proportions, the strength and density of the rare-earth zirconia ceramics are improved, resulting in a rare-earth zirconia ceramic with an optimal compression ratio during the pressurization process in high-temperature and high-pressure experiments. This reduces pressure loss at the sealing edges, allowing more pressure to be transferred to the sample cavity and increasing the internal pressure of the cavity.

[0006] Another object of the present invention is to provide the application of the above-mentioned rare earth-doped zirconium oxide pressure transmission medium.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions.

[0008] This invention provides a method for preparing a rare-earth-doped zirconium oxide pressure-transmitting medium, which includes the following steps:

[0009] (1) Mixing

[0010] First, yttrium oxide and zirconium oxide powders are mixed evenly to obtain yttrium oxide-doped zirconium oxide powder; then, the yttrium oxide-doped zirconium oxide powder is mixed evenly with cerium oxide powder to obtain rare earth co-doped zirconium oxide powder; the mass fraction of yttrium oxide powder in the yttrium oxide-doped zirconium oxide powder is 3%-12%; the mass fraction of cerium oxide powder in the rare earth co-doped zirconium oxide powder is 10%-50%.

[0011] (2) Initial sintering

[0012] Rare earth co-doped zirconium oxide powder was pressed into shape under 40MPa-80MPa conditions to obtain a first rare earth co-doped zirconium oxide blank; then the pressed first rare earth co-doped zirconium oxide blank was sintered at 1200℃-1500℃ for 2h-10h to obtain the first sintered product.

[0013] (3) Molding and sintering

[0014] The initial sintering product is crushed, ground, and sieved to obtain rare earth co-doped zirconia particles of different sizes. The rare earth co-doped zirconia particles of different sizes are then mixed evenly and added to a molding die. The die is then pressed at 300 MPa-500 MPa to obtain a second rare earth co-doped zirconia preform. The pressed second rare earth co-doped zirconia preform is then sintered at 1100℃-1600℃ for 2-10 hours to obtain rare earth co-doped zirconia ceramic.

[0015] In step (1) above, the yttrium oxide powder has a particle size of 50nm-500nm; the cerium oxide powder has a particle size of 50nm-500nm; the yttrium oxide and zirconium oxide powders are mixed for 4h-12h; and the yttrium-doped zirconium oxide powder is mixed with cerium oxide for 4h-12h.

[0016] In step (2) above, the sintering heating rate is 100℃ / h-300℃ / h; after sintering, the temperature is lowered to below 100℃, and the cooling rate is 100℃ / h-200℃ / h.

[0017] In step (3) above, the rare earth co-doped zirconia particles of different sizes include 20-50 mesh, 50-100 mesh, and larger than 100 mesh. The rare earth co-doped zirconia particles of different sizes are mixed evenly in a mass ratio of 20-50 mesh: 50-100 mesh: larger than 100 mesh = (7-4):(2-4):(1-2) for 4-12 hours; then the mixture is added to a molding die and pressed into shape. During the sintering process of the pressed second rare earth co-doped zirconia blank, the sintering heating rate is 100℃ / h-300℃ / h; after sintering, the temperature is lowered to below 100℃ at a cooling rate of 100℃ / h-200℃ / h.

[0018] The present invention also provides a rare earth-doped zirconium oxide pressure-transmitting medium prepared by the above method.

[0019] The present invention also provides the application of the above-mentioned rare earth-doped zirconium oxide pressure transmission medium as a heat-insulating pressure transmission medium.

[0020] This invention prepares zirconia ceramics with both high thermal insulation and pressure transmission properties by doping yttrium oxide and cerium oxide into zirconia. Compared with the prior art, this invention has the following advantages:

[0021] 1) This invention utilizes yttrium and cerium to replace zirconium atoms in the zirconium oxide lattice, forming a solid solution and generating point defects of different types and mechanisms within the zirconium oxide. These point defects mainly exist in the form of oxygen vacancies. Oxygen vacancy defects cause phonon scattering, thereby reducing phonon heat transfer. This results in rare-earth co-doped zirconium oxide having a lower thermal conductivity, achieving a higher cavity temperature under the same heating power loading compared to traditional domestically produced zirconium oxide. Furthermore, the incorporation of cerium oxide and yttrium oxide multi-element rare-earth stabilizers enhances the thermal stability of the zirconium oxide. Therefore, the rare-earth zirconium oxide prepared by the method of this invention exhibits superior thermal insulation performance and thermal stability.

[0022] 2) This invention uses mixed-size rare-earth co-doped zirconia particles for proportioning, with smaller-size zirconia particles filling the gaps between larger-size zirconia particles, resulting in high density of the prepared zirconia trench ceramic material. By controlling the sintering temperature, the bonding and growth between zirconia ceramic grains are controlled, reducing its ceramization degree, and the prepared zirconia ceramic assembly exhibits good rheological properties during pressure loading, reducing the consumption of loading pressure in the zirconia. The suitable density allows for a good fit between the zirconia and pyrophyllite compression ratios in high-temperature and high-pressure experiments, enabling the sample cavity pressure to approach the calibration pressure of the solid pyrophyllite block as closely as possible, thus achieving higher pressure conditions in high-temperature and high-pressure experiments. Attached Figure Description

[0023] Figure 1 The XRD analysis results are for the 25% CeO2-8Y stabilized zirconium oxide prepared in Example 3;

[0024] Figure 2 The above are the SEM analysis results of the 25% CeO2-8Y stabilized zirconium oxide prepared in Example 3;

[0025] Figure 3 Images of different zirconium oxide ceramics;

[0026] Figure 4 Assembled for high temperature and high pressure experiments; 1-zirconia ceramic, 2-graphite layer, 3-sample cavity, 4-steel plug, 5-pyrophyllite;

[0027] Figure 5 The results show the temperature test results of different zirconia ceramic cavities prepared in Example 4, Comparative Example 1, and Comparative Example 2.

[0028] Figure 6 The results of temperature tests on the different zirconia ceramic cavities prepared in Examples 1-4 are as follows;

[0029] Figure 7 Test results of silver melting point temperature of domestically produced CaO-stabilized zirconia ceramics under different system hydraulic loading conditions using the silver melting point method;

[0030] Figure 8 Example 3: Test results of the silver melting point temperature of 25% CeO2-8Y stabilized zirconia ceramics under different system hydraulic pressure loading using the silver melting point method;

[0031] Figure 9 The results show the internal pressure test results of different zirconia ceramic cavities prepared in Example 3 and Comparative Example 1. Detailed Implementation

[0032] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention prepares zirconia ceramic materials with excellent thermal conductivity and improved pressure transmission performance by doping zirconia with different proportions of rare earth oxides and using different particle sizes. These materials are suitable for use as a heat-insulating and pressure-transmitting medium in high-temperature and high-pressure experiments to achieve higher temperature and pressure conditions. The temperature at the center of the sample was measured under the same power in a high-temperature and high-pressure generating device (a six-sided hinged press), thus comparing the heat-insulating performance of zirconia with different doping ratios. Furthermore, the internal pressure of the high-temperature and high-pressure experimental chamber was calibrated using the silver melting point method, revealing the differences in pressure transmission performance between zirconia prepared by different methods and traditional domestically produced zirconia.

[0034] The zirconium oxide used in Examples 1-7 and Comparative Example 1 was all domestically produced and purchased from Maclean's.

[0035] Example 1

[0036] This embodiment provides a method for preparing 0% CeO2-8Y stabilized zirconium oxide, the steps of which are as follows:

[0037] (1) Mixing

[0038] Yttrium oxide and zirconium oxide powders with a particle size of 50 nm purchased from the market were ultrasonically dispersed separately using an ultrasonic generator for 10 minutes. After ultrasonic dispersion, nano-yttrium oxide and nano-zirconia powders were obtained. 16 g of yttrium oxide and 184 g of zirconium oxide were weighed at a mass ratio of 8:92 to prepare a mixed powder. The mixed powder was packaged and then placed in a mixer for mixing for 12 hours. After mixing, a uniformly mixed zirconium oxide powder with 8% yttrium oxide doping was obtained, which was denoted as 8Y zirconium oxide powder.

[0039] (2) Initial sintering

[0040] Using a 48mm*48mm mold, 100g of 8Y zirconia powder was loaded, and a four-column press was used to press the 8Y zirconia powder into a block, thus obtaining the first rare earth co-doped zirconia blank.

[0041] The first rare earth co-doped zirconia preform, after being pressed, was placed in a muffle furnace for initial sintering. The sintering temperature was set at 1250℃. The sintering heating rate was 200℃ / h. After heating to the sintering temperature of 1250℃, the preform was held at that temperature for 2 hours. Then, the preform was cooled to below 100℃ at a cooling rate of 200℃ / h. The initial sintered product, denoted as 8Y stabilized zirconia, was obtained after the initial sintering.

[0042] (3) Molding and sintering

[0043] The 8Y stabilized zirconia blocks after initial sintering were crushed and sieved using 100-mesh, 50-mesh, and 20-mesh screens to obtain 8Y stabilized zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and larger than 100 mesh.

[0044] Different sizes of 8Y stabilized zirconia particles were mixed in a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = 7:2:1 in a mixer for 12 hours. Then, 10g of the mixture was weighed and placed into a molding die. The die was then pressed using a four-column press at an actual pressure of 400MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0045] After being pressed and shaped, rare earth co-doped zirconium oxide is placed in a muffle furnace for shaping and sintering. The sintering temperature is set at 1450℃. The sintering heating rate is 300℃ / h. After heating to the sintering temperature of 1450℃, the temperature is held for 4 hours. Then, the temperature is lowered to below 100℃ at a cooling rate of 200℃ / h.

[0046] After sintering, rare earth co-doped zirconia ceramics are obtained, denoted as 8Y stable zirconia ceramics; then, they are processed into the required shape using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0047] Example 2

[0048] This embodiment provides a method for preparing 10% CeO2-8Y stabilized zirconium oxide, the steps of which are as follows:

[0049] (1) Mixing

[0050] Yttrium oxide and zirconium oxide powders with a particle size of 50 nm purchased from the market were ultrasonically dispersed separately using an ultrasonic generator for 10 minutes. After ultrasonic dispersion, nano-yttrium oxide and nano-zirconia powders were obtained. 16 g of yttrium oxide and 184 g of zirconium oxide were weighed at a mass ratio of 8:92 to prepare a mixed powder. The mixed powder was packaged and then placed in a mixer for mixing for 12 hours. After mixing, a uniformly mixed zirconium oxide powder with 8% yttrium oxide doping was obtained, which was denoted as 8Y zirconium oxide powder.

[0051] Next, 20g of cerium oxide powder and 180g of 8Y zirconium oxide powder with a particle size of 50nm were weighed at a mass ratio of 10:90 to prepare rare earth co-doped zirconium oxide powder. The mixed rare earth co-doped zirconium oxide powder was put into a mixer for mixing, and the mixing time was set to 12h. After the mixing was completed, a uniformly mixed rare earth co-doped zirconium oxide powder was obtained.

[0052] (2) Initial sintering

[0053] Using a 48mm*48mm mold, 100g of rare earth co-doped zirconium oxide powder is loaded. A four-column press is used to press the rare earth co-doped zirconium oxide powder into a block, thus obtaining the first rare earth co-doped zirconium oxide blank.

[0054] The first rare earth co-doped zirconia preform, after being pressed and formed, was placed in a muffle furnace for initial sintering. The sintering temperature was set at 1250℃. The sintering heating rate was 200℃ / h. After heating to the sintering temperature of 1250℃, the preform was held at that temperature for 2 hours. Then, the preform was cooled to below 100℃ at a cooling rate of 200℃ / h. The initial sintering product was obtained after the first sintering and was denoted as 10% CeO2-8Y stabilized zirconia.

[0055] (3) Molding and sintering

[0056] The 10% CeO2-8Y stabilized zirconia blocks after initial sintering were crushed and sieved using 100-mesh, 50-mesh, and 20-mesh screens to obtain 10% CeO2-8Y stabilized zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and larger than 100 mesh.

[0057] Different sizes of 10% CeO2-8Y stabilized zirconia particles were mixed in a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = 7:2:1 in a mixer for 12 hours. Then, 10g of the mixture was weighed and placed into a molding die. The die was then pressed using a four-column press at an actual pressure of 400MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0058] After pressing and molding, 10% CeO2-8Y stabilized zirconia was placed in a muffle furnace for molding and sintering. The sintering temperature was set at 1450℃. The sintering heating rate was 300℃ / h. After heating to the sintering temperature of 1450℃, the temperature was held for 4 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h.

[0059] After sintering, rare earth co-doped zirconia ceramics are obtained, denoted as 10% CeO2-8Y stabilized zirconia ceramics; then, they are processed into the required shapes using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0060] Example 3

[0061] This embodiment provides a method for preparing 25% CeO2-8Y stabilized zirconium oxide, the steps of which are as follows:

[0062] (1) Mixing

[0063] Yttrium oxide and zirconium oxide powders with a particle size of 50 nm purchased from the market were ultrasonically dispersed separately using an ultrasonic generator for 10 minutes. After ultrasonic dispersion, nano-yttrium oxide and nano-zirconia powders were obtained. 16 g of yttrium oxide and 184 g of zirconium oxide were weighed at a mass ratio of 8:92 to prepare a mixed powder. The mixed powder was packaged and then placed in a mixer for mixing for 12 hours. After mixing, a uniformly mixed zirconium oxide powder with 8% yttrium oxide doping was obtained, which was denoted as 8Y zirconium oxide powder.

[0064] Next, 50g of cerium oxide powder and 150g of 8Y zirconium oxide powder with a particle size of 50nm were weighed according to a mass fraction ratio of 25:75 to prepare rare earth co-doped zirconium oxide powder. The mixed rare earth co-doped zirconium oxide powder was put into a mixer for mixing, and the mixing time was set to 12h. After the mixing was completed, a uniformly mixed rare earth co-doped zirconium oxide powder was obtained.

[0065] (2) Initial sintering

[0066] Using a 48mm*48mm mold, 100g of rare earth co-doped zirconium oxide powder is loaded. A four-column press is used to press the rare earth co-doped zirconium oxide powder into a block, thus obtaining the first rare earth co-doped zirconium oxide blank.

[0067] The first rare earth co-doped zirconia preform, after being pressed, was placed in a muffle furnace for initial sintering. The sintering temperature was set at 1250℃. The sintering heating rate was 200℃ / h. After heating to the sintering temperature of 1250℃, the preform was held at that temperature for 2 hours. Then, the preform was cooled to below 100℃ at a cooling rate of 200℃ / h. The initial sintered product was obtained after the first sintering and was designated as 25%CeO2-8Y stabilized zirconia.

[0068] (3) Molding and sintering

[0069] The 25% CeO2-8Y stabilized zirconia blocks after initial sintering were crushed and sieved using 100-mesh, 50-mesh, and 20-mesh screens to obtain 25% CeO2-8Y stabilized zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and larger than 100 mesh.

[0070] Different sizes of 25% CeO2-8Y stabilized zirconia particles were mixed in a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = 7:2:1 in a mixer for 12 hours. Then, 10g of the mixture was weighed and placed into a molding die. The die was then pressed using a four-column press at an actual pressure of 400MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0071] After pressing and molding, 25% CeO2-8Y stabilized zirconia was placed in a muffle furnace for molding and sintering. The sintering temperature was set at 1450℃. The sintering heating rate was 300℃ / h. After heating to the sintering temperature of 1450℃, the temperature was held for 4 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h.

[0072] After sintering, rare earth co-doped zirconia ceramics are obtained, denoted as 25%CeO2-8Y stabilized zirconia ceramics; then, they are processed into the required shapes using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0073] Example 4

[0074] This embodiment provides a method for preparing 50% CeO2-8Y stabilized zirconium oxide, the steps of which are as follows:

[0075] (1) Mixing

[0076] Yttrium oxide and zirconium oxide powders with a particle size of 50 nm purchased from the market were ultrasonically dispersed separately using an ultrasonic generator for 10 minutes. After ultrasonic dispersion, nano-yttrium oxide and nano-zirconia powders were obtained. 16 g of yttrium oxide and 184 g of zirconium oxide were weighed at a mass ratio of 8:92 to prepare a mixed powder. The mixed powder was packaged and then placed in a mixer for mixing for 12 hours. After mixing, a uniformly mixed zirconium oxide powder with 8% yttrium oxide doping was obtained, which was denoted as 8Y zirconium oxide powder.

[0077] Next, 100g of cerium oxide powder and 100g of 8Y zirconium oxide powder with a particle size of 50nm are weighed in a mass ratio of 50:50 to prepare rare earth co-doped zirconium oxide powder. The mixed rare earth co-doped zirconium oxide powder is put into a mixer for mixing, and the mixing time is set to 12h. After the mixing is completed, a uniformly mixed rare earth co-doped zirconium oxide powder is obtained.

[0078] (2) Initial sintering

[0079] Using a 48mm*48mm mold, 100g of rare earth co-doped zirconium oxide powder is loaded. A four-column press is used to press the rare earth co-doped zirconium oxide powder into a block, thus obtaining the first rare earth co-doped zirconium oxide blank.

[0080] The first rare earth co-doped zirconia preform, after being pressed, was placed in a muffle furnace for initial sintering. The sintering temperature was set at 1250℃. The sintering heating rate was 200℃ / h. After heating to the sintering temperature of 1250℃, the preform was held at that temperature for 2 hours. Then, the preform was cooled to below 100℃ at a cooling rate of 200℃ / h. The initial sintered product was obtained after the first sintering and was designated as 50% CeO2-8Y stabilized zirconia.

[0081] (3) Molding and sintering

[0082] The 50% CeO2-8Y stabilized zirconia blocks after initial sintering were crushed and sieved using 100-mesh, 50-mesh, and 20-mesh screens to obtain 50% CeO2-8Y stabilized zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and larger than 100 mesh.

[0083] Different sizes of 50% CeO2-8Y stabilized zirconia particles were mixed in a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = 7:2:1 in a mixer for 12 hours. Then, 10g of the mixture was weighed and placed into a molding die. The die was then pressed using a four-column press at an actual pressure of 400MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0084] After pressing and molding, 50% CeO2-8Y stabilized zirconia was placed in a muffle furnace for molding and sintering. The sintering temperature was set at 1450℃. The sintering heating rate was 300℃ / h. After heating to the sintering temperature of 1450℃, the temperature was held for 4 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h.

[0085] After sintering, rare earth co-doped zirconia ceramics are obtained, denoted as 50%CeO2-8Y stabilized zirconia ceramics; then, they are processed into the required shapes using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0086] Example 5

[0087] This embodiment provides a method for preparing 50% CeO2-3Y stabilized zirconium oxide, the steps of which are as follows:

[0088] (1) Mixing

[0089] Yttrium oxide and zirconium oxide powders with a particle size of 200 nm purchased from the market were ultrasonically dispersed using an ultrasonic generator for 10 minutes. After ultrasonic dispersion, nano-yttrium oxide and nano-zirconia powders were obtained. Yttrium oxide and zirconium oxide powders with a particle size of 200 nm were weighed at a mass ratio of 3:97 (15 g yttrium oxide and 485 g zirconium oxide) to prepare a mixed powder. The mixed powder was packaged and then placed in a mixer for mixing for 8 hours. After mixing, a uniformly mixed zirconium oxide powder with 3% yttrium oxide doping was obtained, denoted as 3Y zirconium oxide powder.

[0090] Next, 100g of cerium oxide powder and 100g of 3Y zirconium oxide powder with a particle size of 200nm were weighed at a mass ratio of 50:50 to prepare rare earth co-doped zirconium oxide powder. The mixed rare earth co-doped zirconium oxide powder was put into a mixer for mixing, and the mixing time was set to 8h. After the mixing was completed, a uniformly mixed rare earth co-doped zirconium oxide powder was obtained.

[0091] (2) Initial sintering

[0092] Using a 48mm*48mm mold, 100g of rare earth co-doped zirconium oxide powder is loaded. A four-column press is used to press the rare earth co-doped zirconium oxide powder into a block, thus obtaining the first rare earth co-doped zirconium oxide blank.

[0093] The first rare earth co-doped zirconia preform, after being pressed and formed, was placed in a muffle furnace for initial sintering. The sintering temperature was set at 1500℃. The sintering heating rate was 300℃ / h. After heating to the sintering temperature of 1500℃, the temperature was held for 2h. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h. The initial sintering product was obtained after the first sintering and was designated as 50% CeO2-3Y stabilized zirconia.

[0094] (3) Molding and sintering

[0095] The 50% CeO2-3Y stabilized zirconia blocks after initial sintering were crushed and sieved using 100-mesh, 50-mesh, and 20-mesh screens to obtain 50% CeO2-3Y stabilized zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and larger than 100 mesh.

[0096] Different sizes of 50% CeO2-3Y stabilized zirconia particles were mixed in a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = 6:3:1 in a mixer for 8 hours. Then, 10g of the mixture was weighed and placed into a molding die. The die was then pressed using a four-column press at an actual pressure of 500MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0097] After pressing and molding, 50% CeO2-3Y stabilized zirconia was placed in a muffle furnace for molding and sintering. The sintering temperature was set at 1600℃. The sintering heating rate was 300℃ / h. After heating to the sintering temperature of 1600℃, the temperature was held for 2 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h.

[0098] After sintering, rare earth co-doped zirconia ceramics are obtained, denoted as 50%CeO2-3Y stabilized zirconia ceramics; then, they are processed into the required shapes using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0099] Example 6

[0100] This embodiment provides a method for preparing 50% CeO2-12Y stabilized zirconium oxide, the steps of which are as follows:

[0101] (1) Mixing

[0102] Yttrium oxide and zirconium oxide powders with a particle size of 500 nm purchased from the market were ultrasonically dispersed using an ultrasonic generator for 10 minutes. After ultrasonic dispersion, nano-yttrium oxide and nano-zirconia powders were obtained. Yttrium oxide powder with a particle size of 200 nm and zirconium oxide powder with a particle size of 500 nm were weighed at a mass ratio of 12:88 to prepare a mixed powder. The mixed powder was packaged and then placed in a mixer for mixing for 4 hours. After mixing, a uniformly mixed zirconium oxide powder with 12% yttrium oxide doping was obtained, which was denoted as 12Y zirconium oxide powder.

[0103] Next, 100g of cerium oxide powder and 100g of 12Y zirconium oxide powder with a particle size of 500nm were weighed at a mass ratio of 50:50 to prepare rare earth co-doped zirconium oxide powder. The mixed rare earth co-doped zirconium oxide powder was put into a mixer for mixing, and the mixing time was set to 4h. After the mixing was completed, a uniformly mixed rare earth co-doped zirconium oxide powder was obtained.

[0104] (2) Initial sintering

[0105] Using a 48mm*48mm mold, 100g of rare earth co-doped zirconium oxide powder is loaded. A four-column press is used to press the rare earth co-doped zirconium oxide powder into a block, thus obtaining the first rare earth co-doped zirconium oxide blank.

[0106] The first rare earth co-doped zirconia preform, after being pressed, was placed in a muffle furnace for initial sintering. The sintering temperature was set at 1200℃. The sintering heating rate was 100℃ / h. After heating to the sintering temperature of 1200℃, the preform was held at that temperature for 10h. Then, the preform was cooled to below 100℃ at a cooling rate of 100℃ / h. The initial sintered product was obtained after the first sintering and was designated as 50% CeO2-12Y stabilized zirconia.

[0107] (3) Molding and sintering

[0108] The 50% CeO2-12Y stabilized zirconia blocks after initial sintering were crushed and screened using 100-mesh, 50-mesh, and 20-mesh sieves to obtain 50% CeO2-12Y stabilized zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and larger than 100 mesh.

[0109] Different sizes of 50% CeO2-12Y stabilized zirconia particles were mixed in a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = 5:3:2 in a mixer for 4 hours. Then, 10g of the mixture was weighed and placed into a molding die. The die was then pressed using a four-column press at an actual pressure of 300MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0110] After pressing and molding, 50% CeO2-12Y stabilized zirconia is placed in a muffle furnace for molding and sintering. The sintering temperature is set at 1100℃. The sintering heating rate is 100℃ / h. After heating to the sintering temperature of 1100℃, the temperature is held for sintering for 10h. Then, the temperature is cooled down to below 100℃ at a cooling rate of 100℃ / h.

[0111] After sintering, rare earth co-doped zirconia ceramics are obtained, denoted as 50%CeO2-12Y stabilized zirconia ceramics; then, they are processed into the required shapes using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0112] Example 7

[0113] This embodiment provides a method for preparing 25% CeO2-8Y stabilized zirconium oxide, the steps of which are as follows:

[0114] (1) Mixing

[0115] Yttrium oxide and zirconium oxide powders with a particle size of 100 nm purchased from the market were ultrasonically dispersed using an ultrasonic generator for 10 minutes. After ultrasonic dispersion, nano-yttrium oxide and nano-zirconia powders were obtained. 16 g of yttrium oxide and 184 g of zirconium oxide were weighed at a mass ratio of 8:92 to prepare a mixed powder. The mixed powder was packaged and then placed in a mixer for mixing for 8 hours. After mixing, a uniformly mixed zirconium oxide powder with 8% yttrium oxide doping was obtained, denoted as 8Y zirconium oxide powder.

[0116] Next, 50g of cerium oxide powder and 150g of 8Y zirconium oxide powder with a particle size of 100nm were weighed according to a mass fraction ratio of 25:75 to prepare rare earth co-doped zirconium oxide powder. The mixed rare earth co-doped zirconium oxide powder was put into a mixer for mixing, and the mixing time was set to 8h. After the mixing was completed, a uniformly mixed rare earth co-doped zirconium oxide powder was obtained.

[0117] (2) Initial sintering

[0118] Using a 48mm*48mm mold, 100g of rare earth co-doped zirconium oxide powder is loaded. A four-column press is used to press the rare earth co-doped zirconium oxide powder into a block, thus obtaining the first rare earth co-doped zirconium oxide blank.

[0119] The first rare earth co-doped zirconia preform, after being pressed, was placed in a muffle furnace for initial sintering at a temperature of 1200℃. The sintering heating rate was 100℃ / h. After heating to the sintering temperature of 1200℃, the preform was held at that temperature for 8 hours. Then, the preform was cooled to below 100℃ at a cooling rate of 100℃ / h. The initial sintered product, denoted as 25%CeO2-8Y stabilized zirconia, was obtained after the initial sintering.

[0120] (3) Molding and sintering

[0121] The 25% CeO2-8Y stabilized zirconia blocks after initial sintering were crushed and sieved using 100-mesh, 50-mesh, and 20-mesh screens to obtain 25% CeO2-8Y stabilized zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and larger than 100 mesh.

[0122] Different sizes of 25% CeO2-8Y stabilized zirconia particles were mixed in a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = 4:4:2 in a mixer for 8 hours. Then, 10g of the mixture was weighed and placed into a molding die. The die was then pressed using a four-column press at an actual pressure of 400MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0123] After pressing and molding, 25% CeO2-8Y stabilized zirconia was placed in a muffle furnace for molding and sintering. The sintering temperature was set at 1400℃. The sintering heating rate was 200℃ / h. After heating to the sintering temperature of 1400℃, the temperature was held for 6 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 100℃ / h.

[0124] After sintering, rare earth co-doped zirconia ceramics are obtained, denoted as 25%CeO2-8Y stabilized zirconia ceramics; then, they are processed into the required shapes using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0125] Comparative Example 1

[0126] This comparative example provides a method for preparing domestically produced CaO-stabilized zirconium oxide, the steps of which are as follows:

[0127] (1) Mixing

[0128] Commercially available 500nm zirconium oxide and 500nm calcium oxide powders were weighed at a mass ratio of 10:1 to prepare a mixed powder. The mixed powder was then placed in a mixer and mixed for 12 hours. After this step, a uniformly mixed zirconium oxide powder with 10% calcium oxide doping was obtained, which was designated as domestic CaO-stabilized zirconium oxide powder.

[0129] (2) Initial sintering

[0130] Using a 48mm*48mm mold, 100g of domestic CaO stabilized zirconia powder was loaded, and a four-column press was used to press the domestic CaO stabilized zirconia powder into a block at a pressure of 60MPa.

[0131] The pressed powder block was placed in a muffle furnace for initial sintering, with the sintering temperature set at 1500℃. The sintering heating rate was 200℃ / h. After heating to the sintering temperature of 1500℃, the temperature was held for 2 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h. The initial sintered product was obtained after the initial sintering, which was denoted as domestic CaO stabilized zirconium oxide.

[0132] (3) Molding and sintering

[0133] The domestically produced CaO-stabilized zirconia blocks after initial sintering were crushed and sieved using a 100-mesh sieve to obtain calcium oxide-stabilized zirconia particles with a particle size of less than 100 mesh.

[0134] Weigh 10g of domestic CaO-stabilized zirconia particles and place them into a molding die. Use a four-column press to form and press the particles under an actual pressure of 400MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0135] After being pressed and shaped, the domestically produced CaO-stabilized zirconia was placed in a muffle furnace for sintering. The sintering temperature was set at 1450℃. The sintering heating rate was 300℃ / h. After heating to the sintering temperature of 1450℃, the temperature was held for 4 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h.

[0136] After sintering, domestically produced CaO-stabilized zirconia ceramics are obtained. They can then be processed into the required shapes using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0137] Comparative Example 2

[0138] This comparative example provides a method for preparing Japanese zirconia, the steps of which are as follows:

[0139] (1) Initial sintering

[0140] Using a 48mm*48mm mold, 100g of Japanese zirconia powder (purchased from Worgrent, particle size 10μm) was loaded into the mold. A four-column press was used to press the Japanese zirconia powder into blocks at a pressure of 60MPa.

[0141] The pressed zirconia blocks were placed in a muffle furnace for initial sintering at a temperature of 1500℃. The sintering heating rate was 200℃ / h. After heating to the sintering temperature of 1500℃, the temperature was held for 2 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h. The initial sintered product was obtained after the initial sintering and was denoted as zirconia.

[0142] (2) Molding and sintering

[0143] The zirconia blocks after initial sintering were crushed and sieved through a 100-mesh sieve to obtain zirconia particles with a particle size greater than 100 mesh.

[0144] Weigh 10g of Japanese zirconia granules and place them into a molding die. Use a four-column press to press the granules under an actual pressure of 400MPa (dimensions: inner diameter 12mm, outer diameter 18.2mm, height 12mm).

[0145] After being pressed and shaped, the Japanese zirconia was placed in a muffle furnace for forming and sintering. The sintering temperature was set at 1450℃. The sintering heating rate was 300℃ / h. After heating to the sintering temperature of 1450℃, the temperature was held for 4 hours. Then, the temperature was lowered to below 100℃ at a cooling rate of 200℃ / h.

[0146] After sintering, Japanese zirconia ceramics are obtained, which can then be processed into the required shape using a carving machine or lathe for use in high-temperature and high-pressure experiments.

[0147] (I) Characterization of Ceramic Structure

[0148] XRD analysis was performed on the 25% CeO2-8Y stabilized zirconium oxide prepared in Example 3. The results are as follows: Figure 1 As shown in the figure, the prepared 25% CeO2-8Y stabilized zirconia is a c phase (cubic phase) and has good thermal stability at high temperatures.

[0149] SEM analysis was performed on the 25% CeO2-8Y stabilized zirconium oxide prepared in Example 3. The results are as follows: Figure 2 As shown in the figure, the initial powder of the zirconia ceramic material prepared by this method is mixed with different particle sizes. Through electron microscopy, it can be seen that the large-size zirconia and small-size zirconia are evenly distributed, and the gaps between the large-size particles are filled by the small-size zirconia, thus making the prepared zirconia ceramic more dense.

[0150] Images of 25% CeO2-8Y stabilized zirconia prepared in Example 3, domestically produced CaO stabilized zirconia ceramics, and Japanese zirconia ceramics were collected, as shown below. Figure 3 As shown in the figure, the domestically produced zirconia is stabilized using CaO, resulting in a white ceramic material. The rare-earth zirconia prepared by the method of this invention uses cerium oxide as a dopant, resulting in a pale yellow cerium oxide powder and consequently, pale yellow zirconia ceramics. Japanese zirconia, on the other hand, is yellow.

[0151] The density of the ceramic samples prepared in Examples 1-4, Comparative Example 1 and Comparative Example 2 was measured, and the results are shown in Table 1.

[0152] Table 1 Ceramic Density

[0153]

[0154] As can be seen from Table 1, the rare earth co-doped zirconia ceramics prepared by the method of the present invention have high density.

[0155] (II) Characterization of ceramic thermal insulation performance

[0156] Here, a high-temperature and high-pressure generator (a six-sided top hinged press) measures the temperature at the center of the sample under the same power, thereby obtaining a comparison of the thermal insulation performance of zirconia under different doping ratios. Figure 4 The high-temperature and high-pressure experimental assembly is given. A graphite layer 2 is set inside the zirconia ceramic 1. An h-BN layer (hexagonal boron nitride) is set between the graphite layer 2 and the sample cavity 3. The sample cavity is filled with sample according to experimental needs. Steel plugs 4 are loaded at both ends of the zirconia ceramic 1. The zirconia ceramic 1 is sealed with pyrophyllite 5.

[0157] The experimental procedure was as follows: graphite powder was pressed into a diameter of... A block with a height (H) of 8.0 mm was placed in the sample chamber and assembled according to the previous high-temperature and high-pressure experimental assembly. Holes were drilled in the high-temperature and high-pressure experimental assembly, and thermocouples were inserted through the holes after being wrapped with alumina ceramic tubes, ensuring their nodes were centered in the sample chamber. Simultaneously, a pressure of 5.5 GPa was applied to the experimental assembly using a high-temperature and high-pressure generator, and the center temperature of the sample chamber was measured under these conditions. Thermoelectric potential signals from the thermocouples were acquired using a multi-channel recorder and converted into corresponding temperature data, thus obtaining the internal temperature of the chamber.

[0158] The changes in the internal components of the zirconia ceramic cavity prepared in Examples 4, 1, and 2 with heating power are as follows: Figure 5As shown in the figure, compared with Japanese zirconia and domestic CaO-stabilized zirconia, the temperature generation efficiency is increased by approximately 15.2% and 9.3% respectively under the same heating power (3.3 kW) (the temperature inside the 50% CeO2-8Y stabilized zirconia ceramic cavity is 2164℃, the temperature inside the Japanese zirconia ceramic cavity is 1878℃, and the temperature inside the domestic CaO-stabilized zirconia ceramic cavity is 1980℃).

[0159] The changes in internal pairings within the zirconia ceramic cavity prepared in Examples 1-4 with heating power are as follows: Figure 6 As shown in the figure, under the same heating power (greater than 2.0 kW), the temperature inside the zirconia ceramic cavity gradually increases with the increase of cerium oxide content. Within the measurement range, the 50% CeO2-8Y stabilized zirconia ceramic cavity has the highest temperature. Therefore, cerium oxide doping effectively improves the temperature generation efficiency and enhances the thermal insulation performance of zirconia.

[0160] This is because cerium atoms replace zirconium atoms in the zirconium oxide lattice during doping. Since the radius of a cerium atom is larger than that of a zirconium atom, phonon scattering is intensified at high temperatures, inhibiting heat conduction and resulting in superior thermal insulation performance of zirconium oxide. Compared to traditional zirconium oxide insulation materials, this invention can achieve a 15% increase in the efficiency of temperature generation inside a high-temperature, high-pressure cavity at the same power.

[0161] (III) Characterization of Ceramic Pressure Transmission Performance

[0162] The high-temperature, high-pressure generating device used in the test was as described above. Pressure calibration was performed using a six-sided hinged press employing the silver melting point method.

[0163] The principle behind using the silver melting point method for cavity pressure calibration is as follows: Silver has different melting points under different pressures, and these melting points increase with increasing pressure. Therefore, by measuring the melting point of silver under specific conditions, the corresponding cavity temperature can be obtained.

[0164] The specific method is as follows:

[0165] 2.0g of sample (Ag) was weighed and pre-pressed using an 8.0mm diameter mold under 10MPa hydraulic pressure (sample pressure 438MPa) with a jack. Molding dimensions: diameter... Height H = 4.0 mm, pre-compacted density: 9.94 g / cm³ 3 Theoretical density 10.5 g / cm³ 3 Pre-compaction density: 94.73%.

[0166] Place the formed Ag sample into the sample chamber, and then assemble it according to the previous high temperature and high pressure experiment assembly. Use a bench drill to make holes and insert thermocouples.

[0167] After assembly, set the pressure and temperature process curves and conduct experiments. Once the pressure reaches the set values ​​of 30MPa, 40MPa, and 50MPa and remains stable, start heating and turn on the multi-channel recorder (set the thermocouple type to "W") to record the temperature data.

[0168] The Ag melting point test results for 25% CeO2-8Y stabilized zirconia ceramics and domestically produced CaO stabilized zirconia ceramics commonly used in high-temperature and high-pressure experiments in China are as follows: Figure 7 and Figure 8 As shown. Then, the Ag point is converted into the corresponding internal pressure of the cavity, and the result is as follows. Figure 9 As shown in Table 2.

[0169] The internal pressures of the cavity using domestically produced zirconia as the pressure transmission medium were measured under different system hydraulic pressures of 30 MPa, 40 MPa, and 50 MPa: 2.7 GPa, 3.5 GPa, and 4.2 GPa, respectively. The internal pressures of the cavity using rare-earth zirconia prepared in Example 3 of this invention as the pressure transmission medium were 3.3 GPa, 4.4 GPa, and 5.1 GPa, respectively. The highest pressure increase was approximately 0.9 GPa, representing a 21.4% improvement in pressure transmission performance. Therefore, this invention exhibits a higher pressure generation efficiency compared to commonly used domestic calcium oxide-stabilized zirconia materials; that is, under the same system hydraulic pressure loading conditions, the internal pressure of the cavity is significantly increased. Thus, the rare-earth co-doped zirconia ceramic prepared in this invention has superior pressure transmission performance compared to domestically produced CaO-stabilized zirconia commonly used in high-temperature and high-pressure experiments in China.

[0170] Table 2 Comparison of Pressure Generation Efficiency between Rare Earth Doped Zirconia and Domestically Produced Zirconia

[0171]

[0172] Therefore, this invention uses a mixture of rare-earth co-doped zirconia particles of varying particle sizes for formulation. Smaller zirconia particles fill the voids between larger zirconia particles, resulting in a higher density in the prepared zirconia trench ceramic material. Furthermore, by controlling the sintering temperature, the bonding and growth between zirconia ceramic grains are controlled, reducing its ceramization degree. This results in better rheological properties of the prepared zirconia ceramic assembly during pressure loading, minimizing pressure loss within the zirconia. Moreover, using different proportions of rare-earth zirconia ceramic particles improves the strength and density of the rare-earth zirconia ceramic, ensuring that the high-temperature, high-pressure experimental assembly assembled from rare-earth zirconia ceramics exhibits an optimal compression ratio during high-temperature, high-pressure testing. This reduces pressure loss at the sealing edges, allowing more pressure to be transmitted to the sample cavity and increasing the internal pressure within the cavity.

[0173] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A method for preparing a rare-earth-doped zirconium oxide pressure-transmitting medium, characterized in that, Includes the following steps: (1) Mixing First, yttrium oxide powder and zirconium oxide powder are mixed evenly to obtain yttrium-doped zirconium oxide powder; then, the yttrium-doped zirconium oxide powder is mixed evenly with cerium oxide powder to obtain rare earth co-doped zirconium oxide powder; the mass fraction of yttrium oxide powder in the yttrium-doped zirconium oxide powder is 3%-12%; the mass fraction of cerium oxide powder in the rare earth co-doped zirconium oxide powder is 10%-50%. (2) First sintering Rare earth co-doped zirconium oxide powder was pressed into shape under 40MPa-80MPa conditions to obtain a first rare earth co-doped zirconium oxide blank; then the pressed first rare earth co-doped zirconium oxide blank was sintered at 1200℃-1500℃ for 2h-10h to obtain the first sintered product. (3) Molding and sintering The initial sintering product was crushed, ground, and sieved to obtain rare earth co-doped zirconia particles with particle sizes of 20-50 mesh, 50-100 mesh, and greater than 100 mesh. Then, the particles were mixed evenly at a mass ratio of 20-50 mesh: 50-100 mesh: greater than 100 mesh = (7-4): (2-4): (1-2), and then added to a molding die. The pellets were then pressed and shaped under 300 MPa-500 MPa to obtain a second rare earth co-doped zirconia blank. The pressed second rare earth co-doped zirconia blank was then sintered at 1100℃-1600℃ for 2-10 hours to obtain rare earth co-doped zirconia ceramic.

2. The method for preparing the rare earth-doped zirconium oxide pressure-transmitting medium according to claim 1, characterized in that, The yttrium oxide powder has a particle size of 50nm-500nm; the cerium oxide powder has a particle size of 50nm-500nm.

3. The method for preparing the rare earth-doped zirconium oxide pressure-transmitting medium according to claim 1 or 2, characterized in that, The mixing time of the yttrium oxide and zirconium oxide powder is 4h-12h; the mixing time of the yttrium-doped zirconium oxide powder and cerium oxide is 4h-12h.

4. The method for preparing the rare earth-doped zirconium oxide pressure-transmitting medium according to claim 1, characterized in that, In step (2), the sintering heating rate is 100℃ / h-300℃ / h; after sintering, the temperature is lowered to below 100℃, and the cooling rate is 100℃ / h-200℃ / h.

5. The method for preparing the rare earth-doped zirconium oxide pressure-transmitting medium according to claim 1, characterized in that, In step (3), the sintering heating rate is 100℃ / h-300℃ / h; after sintering, the temperature is lowered to below 100℃, and the cooling rate is 100℃ / h-200℃ / h.

6. The rare earth-doped zirconium oxide pressure transmission medium prepared by the method according to any one of claims 1 to 5.

7. The application of the rare earth-doped zirconium oxide pressure transmission medium according to claim 6, characterized in that, Used as a heat-insulating and pressure-transmitting medium.

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