Thermistor material suitable for intelligent sensing wall surface of commercial aerospace engine and preparation method of thermistor material

Abstract

The invention discloses a thermistor material suitable for an intelligent sensing wall surface of a commercial aerospace engine and a preparation method of the thermistor material. According to the method, yttrium oxide, tetraterbium heptaoxide, tungsten trioxide, hafnium oxide, dysprosium trioxide, tantalum pentoxide, niobium pentoxide or praseodymium oxide are proportionally doped at A and B positions, namely Y and Ta positions of YTaO4 by utilizing an entropy strategy; the tantalate thermistor material is obtained through the processes of mixed grinding, calcining, regrinding, cold isostatic pressing forming, high-temperature sintering and the like. The thermistor has the advantages of wide temperature measurement range, high temperature resistance, good linearity and the like, the obtained tantalate medium-entropy thermistor material has relatively good high-temperature stability and good NTC (Negative Temperature Coefficient) performance, the measurement range is 200-1500 DEG C, the linearity is high, the temperature measurement range of an intelligent sensing wall surface can be covered, the response is quick, and the method is suitable for popularization and application. The problem that accurate and stable work cannot be carried out at high temperature is solved, and the method can be suitable for temperature monitoring of the intelligent sensing wall surface of a commercial aerospace engine.

Description

Technical Field

[0001] The present invention relates to a thermistor material suitable for intelligent sensing walls of commercial aerospace engines and a preparation method thereof. Technical Background

[0002] Commercial aerospace engines (including combustion chambers and nozzles) experience temperatures ranging from 0 to 1200°C, accompanied by extreme conditions such as severe vibration, high pressure, and high-velocity gas flow impact. Modern commercial aerospace propulsion systems, in pursuit of higher thrust-to-weight ratios and thermal cycle efficiency, continuously increase pre-turbine gas temperature parameters. This results in increasingly harsh service temperatures for hot-end components such as the combustion chamber, turbine rotor, and tail nozzle. Under these extreme thermal loads, maintaining the durability and structural integrity of these components presents significant technical challenges. This places significant demands on the commercial aerospace engine R&D system, from design theory and manufacturing processes to test verification. Accurately acquiring high-temperature surface temperature data for hot-end components is not only a core element for real-time monitoring of commercial aerospace engine operating conditions and ensuring operational safety, but also a critical parameter for performance evaluation and life prediction. The current technical bottleneck that urgently needs to be overcome is how to ensure reliable operation of temperature sensors in extremely high-temperature environments while simultaneously meeting the combined requirements of improved measurement accuracy, optimized temperature response speed, and long-term stability. This has become a key and common technical challenge hindering the development of the next generation of commercial aerospace engines.

[0003] Traditional temperature sensors (such as thermocouples and infrared temperature measurement) have limitations in spatial integration, local response speed, and multi-point distributed measurement. Intelligent sensing walls need to achieve high-precision, high-reliability, and real-time dynamic monitoring to optimize engine thermal protection and performance control. The walls of commercial aerospace engines need to be embedded with distributed sensor networks. Thermistors are an ideal choice due to their miniaturization, easy integration, and low power consumption. However, the operating temperature of conventional thermistors (such as NTC / PTC) is usually below 300°C and cannot be used in high-temperature aerospace scenarios. Thermistor materials are a type of material whose resistance changes significantly with temperature and are widely used in temperature sensing, control, and compensation. Negative temperature coefficient (NTC) thermistor materials have reduced resistance at high temperatures and are suitable for temperature monitoring and control in high-temperature environments.

[0004] The researchers used YTaO4 scheelite material and applied the entropy increase strategy to dope the A and B positions in equal proportion to obtain a negative temperature coefficient medium-entropy thermistor ceramic with a measurement range of 200-1500°C and high linearity. It can cover the measurement temperature range of the intelligent sensing wall. Because of its low thermal conductivity, it can quickly monitor temperature changes and respond, solving the problem of inability to perform accurate and stable work at high temperatures. Due to its low cost, small size and easy integration, it can be used for temperature monitoring of the intelligent sensing wall of commercial aerospace engines. Summary of the Invention

[0005] The purpose of the present invention is to provide a thermistor material suitable for intelligent sensing wall of commercial aerospace engines and a preparation method thereof. The method uses an entropy strategy to dope yttrium trioxide, terbium heptoxide, tungsten trioxide, hafnium dioxide, dysprosium trioxide, tantalum pentoxide, niobium pentoxide or hexaprone undecoxide at the A and B positions of YTaO4 in equal proportions, and then obtains YTaO4 through mixed grinding, calcination, re-grinding, cold isostatic pressing, high-temperature sintering and other processes. 1 / 2 Tb 1 / 2 TaO4, Y 1 / 3Tb 1 / 3 Pr 1 / 3 TaO4, Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4; B position: YTaO4, YTa 1 / 2 Nb 1 / 2 O4, YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4, YTa 1 / 4Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 thermistor material (). The thermistor of the present invention has the advantages of wide temperature range, high temperature resistance, good linearity, etc. 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO 4、 Y 1 / 3 Nb 1 / 3 W 1 / 3 O4's disc-shaped high-density ceramic material has good density and excellent negative temperature coefficient characteristics.

[0006] The present invention discloses a thermistor material suitable for intelligent sensing wall of commercial aerospace engines. The material is doped with yttrium trioxide, terbium heptoxide, tungsten trioxide, hafnium dioxide, dysprosium trioxide, tantalum pentoxide, niobium pentoxide or hexaprone undecoxide in equal proportions at the A and B positions of YTaO4, i.e., Y and Ta positions, using an entropy strategy. The material is doped with yttrium trioxide, terbium heptoxide, tungsten trioxide, hafnium dioxide, dysprosium trioxide, tantalum pentoxide, niobium pentoxide or hexaprone undecoxide in equal proportions at the A and B positions of YTaO4, i.e., Y and Ta positions. 1 / 2 Tb 1 / 2 TaO4, Y 1 / 3Tb 1 / 3 Pr 1 / 3 TaO4, Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4; B position: YTaO4, YTa1 / 2 Nb 1 / 2 O4, YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4, YTa 1 / 4Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4, the specific operation is as follows:

[0007] A-site preparation:

[0008] a. According to molecular formula Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 The molar ratio of TaO4 is calculated, and the raw materials yttrium trioxide, terbium heptoxide, dysprosium trioxide, tantalum pentoxide or hexaprone undecoxide are weighed and mixed and ground for 6-8 hours, and then calcined at a temperature of 1400℃-1500℃ for 6 hours, and ground again for 6 hours to obtain dispersed Y 1 / 2 Tb 1 / 2TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4 powder;

[0009] Preparation of position B:

[0010] b. According to the molecular formula YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 The raw materials yttrium trioxide, tungsten trioxide, hafnium dioxide, niobium pentoxide or tantalum pentoxide were weighed and ground for 6-8 hours, and then calcined at 1400℃-1500℃ for 6 hours and ground again for 6 hours to obtain dispersed YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 powder;

[0011] c. The powders obtained in step a and step b were molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied. After holding the pressure for 15 seconds, Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 ceramic green body material;

[0012] d. The ceramic green body obtained in step c is vacuum packaged and cold isostatically pressed at 200-300 MPa for 1-3 min, then placed in a muffle furnace at 1500-1700 ° C for 8 h, and cooled to room temperature to obtain a disc-shaped high-density Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4W 1 / 4 Hf 1 / 4 O4 ceramic material;

[0013] e. The disc-shaped high-density ceramic obtained in step d was polished on both sides with 1500-mesh fine sandpaper for 1 minute, and then ultrasonically cleaned with anhydrous ethanol for 30 minutes. Platinum slurry electrodes were coated on both sides, and then annealed at 900°C for 1 hour to obtain Y 1 / 2 Tb 1 / 2 TaO4、Y1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 thermistor material, of which Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 The temperature ranges of O4 are 200-1500℃ and 400-1500℃ respectively, and the material constant is B 200℃ / 1500℃ =8913K-14345K, B 400℃ / 1500℃ =15461K-17686K.

[0014] A method for preparing a thermistor material suitable for intelligent sensing wall surfaces of commercial aerospace engines is carried out in the following steps:

[0015] A-site preparation:

[0016] a. According to molecular formula Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 The molar ratio of TaO4 is calculated, and the raw materials yttrium trioxide, terbium heptoxide, dysprosium trioxide, tantalum pentoxide or hexaprone undecoxide are weighed and mixed and ground for 6-8 hours, and then calcined at a temperature of 1400℃-1500℃ for 6 hours, and ground again for 6 hours to obtain dispersed Y 1 / 2 Tb 1 / 2TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4 powder;

[0017] Preparation of position B:

[0018] b. According to the molecular formula YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 The raw materials yttrium trioxide, tungsten trioxide, hafnium dioxide, niobium pentoxide or tantalum pentoxide were weighed and ground for 6-8 hours, and then calcined at 1400℃-1500℃ for 6 hours and ground again for 6 hours to obtain dispersed YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 powder;

[0019] c. The powders obtained in step a and step b were molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied. After holding the pressure for 15 seconds, Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 ceramic green body material;

[0020] d. The ceramic green body obtained in step c is vacuum packaged and cold isostatically pressed at 200-300 MPa for 1-3 min, then placed in a muffle furnace at 1500-1700 ° C for 8 h, and cooled to room temperature to obtain a disc-shaped high-density Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3Tb 1 / 3 Pr1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4W 1 / 4 Hf 1 / 4 O4 medium entropy ceramic materials;

[0021] e. The disc-shaped high-density ceramic obtained in step d was polished on both sides with 1500-mesh fine sandpaper for 1 minute, and then ultrasonically cleaned with anhydrous ethanol for 30 minutes. Platinum slurry electrodes were coated on both sides, and then annealed at 900°C for 1 hour to obtain Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 medium entropy thermistor material, where Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4、YTa 1 / 3 Nb 1 / 3W 1 / 3 The temperature ranges of O4 are 200-1500℃ and 400-1500℃ respectively, and the material constant is B 200℃ / 1500℃ =8913K-14345K, B 400℃ / 1500℃ =15461K-17686K.

[0022] Y obtained by the method of the present invention 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4、YTa 1 / 3 Nb 1 / 3 W1 / 3 O4 medium entropy thermistor material has relatively good high temperature stability and good negative temperature coefficient (NTC) performance, which can effectively solve the problems of traditional thermistors such as narrow temperature range and poor linearity. 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4TaO4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 The process of O4 entropy thermistor material is unique.

[0023] The present invention realizes for the first time a high-density, high-temperature negative temperature coefficient (NTC) thermistor that can be applied to a wide temperature range of 200-1500°C at medium and high temperatures and can be used for a long time.

[0024] Y prepared by the method of the present invention 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 The O4 medium-entropy thermistor material has a good linear relationship between Ln(ρ) and 1000 / T at a temperature of 200-1500℃, and the Pearson coefficient can reach 0.996. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Y prepared by the present invention 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4、YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 XRD spectrum of entropy thermosensitive material in O4;

[0026] Figure 2 Y prepared by the present invention 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4、YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 Resistance-temperature characteristic curve of O4 thermosensitive material;

[0027] Figure 3 Y prepared by the present invention 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 3 Nb 1 / 3 W 1 / 3 Thermal conductivity change curve of O4 thermosensitive material;

[0028] Figure 4 This is the atomic structure diagram of YTaO4 in the present invention. DETAILED DESCRIPTION

[0029] Example 1

[0030] According to the molar ratio calculated by the molecular formula YTaO4, 16.856g of yttrium trioxide and 33.143g of tantalum pentoxide were weighed and mixed and ground for 8h, then calcined at 1400℃ for 6h and ground again for 6h to obtain 50g of dispersed YTaO4 powder;

[0031] The obtained powder was formed into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied and maintained for 15 seconds to obtain a YTaO4 ceramic green body material;

[0032] The obtained ceramic green body material was vacuum packaged and cold isostatically pressed at a pressure of 300 MPa for 3 minutes, then kept at a temperature of 1700°C for 8 hours, and cooled to room temperature to obtain a disc-shaped YTaO4 ceramic block material;

[0033] The obtained disc-shaped high-density ceramic was polished on both sides with 1500-grit fine sandpaper for 1 minute, then ultrasonically cleaned with anhydrous ethanol for 30 minutes, coated with platinum paste electrodes on both sides, and then annealed at 900℃ for 1 hour to obtain a temperature range of 600-1400℃ with a material constant of B. 600℃ / 1400℃ =21470K YTaO4 thermistor material.

[0034] Example 2

[0035] According to molecular formula Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 The raw materials of yttrium trioxide 1.461g, terbium heptoxide 2.4202g, dysprosium dioxide 2.4168g, tantalum pentoxide 11.4968g and praseodymium undecoxide 2.2041g were weighed and ground for 8h, then calcined at 1500℃ for 6h and ground again for 6h to obtain dispersed Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4 powder 20g;

[0036] The obtained powder was molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied and maintained for 15 seconds to obtain Y 1 / 4 Tb 1 / 4Pr 1 / 4 Dy 1 / 4 TaO4 ceramic green body material;

[0037] The obtained ceramic green body material was vacuum packaged and cold isostatically pressed at 300 MPa for 3 minutes, then kept at 1600 ° C for 8 hours, and then cooled to room temperature to obtain a disc-shaped Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4 ceramic bulk material;

[0038] The obtained disc-shaped high-density ceramic was polished on both sides with 1500-grit fine sandpaper for 1 minute, then ultrasonically cleaned with anhydrous ethanol for 30 minutes, coated with platinum paste electrodes on both sides, and then annealed at 900℃ for 1 hour to obtain a temperature range of 200-1500℃ with a material constant of B. 200℃ / 1500℃ =8913K Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4 thermistor material.

[0039] Example 3

[0040] According to the molecular formula YTa 1 / 3 Nb 1 / 3 W 1 / 3The raw materials of yttrium trioxide 18.252g, tantalum pentoxide 11.962g, niobium pentoxide 7.16g and tungsten trioxide 12.616g were weighed and ground for 8h, then calcined at 1450℃ for 6h and ground again for 6h to obtain dispersed YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 powder 50g;

[0041] The obtained powder was molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied and maintained for 15 seconds to obtain YTa 1 / 3Nb 1 / 3 W 1 / 3 O4 ceramic green body material;

[0042] The obtained ceramic green body material was vacuum packaged and cold isostatically pressed at 300 MPa for 3 minutes, then kept at 1500 ° C for 8 hours, and then cooled to room temperature to obtain YTa discs. 1 / 3 Nb 1 / 3 W 1 / 3 O4 ceramic bulk material;

[0043] The obtained disc-shaped high-density ceramic was polished on both sides with 1500-grit fine sandpaper for 1 minute, then ultrasonically cleaned with anhydrous ethanol for 30 minutes, coated with platinum paste electrodes on both sides, and then annealed at 900℃ for 1 hour to obtain a temperature range of 400-1500℃ with a material constant of B. 400℃ / 1500℃ =15461K YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 medium entropy thermistor material.

[0044] Example 4

[0045] According to molecular formula Y 1 / 2 Tb 1 / 2 The raw materials yttrium trioxide 7.5896g, terbium heptoxide 12.5654g, and tantalum pentoxide 29.8448g were weighed and ground for 8h, and then calcined at 1400℃ for 6h and ground again for 6h to obtain dispersed Y 1 / 2 Tb 1 / 2 TaO4 powder;

[0046] The obtained powder was molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied and maintained for 15 seconds to obtain Y 1 / 2 Tb 1 / 2TaO4, ceramic green body material;

[0047] The obtained ceramic embryo was vacuum packaged and cold isostatically pressed at 300 MPa for 1 min, then placed in a muffle furnace at 1500 ° C for 8 h, and cooled to room temperature to obtain a disc-shaped high-density Y 1 / 2 Tb 1 / 2 TaO4 medium entropy ceramic material;

[0048] The obtained disc-shaped high-density ceramic was polished on both sides with 1500-mesh fine sandpaper for 1 minute, then ultrasonically cleaned with anhydrous ethanol for 30 minutes, coated with platinum paste electrodes on both sides, and then annealed at 900℃ for 1 hour to obtain a temperature range of 300-1400℃ with a material constant of B. 300℃ / 1400℃ =10422K Y 1 / 2 Tb 1 / 2 TaO4 thermistor material.

[0049] Example 5

[0050] According to molecular formula Y 1 / 3 Tb 1 / 3 Pr 1 / 3 The molar ratio of TaO4 was calculated by weighing 4.9696g of yttrium trioxide, 8.227g of terbium heptoxide, 29.3106g of tantalum pentoxide or 7.4926g of praseodymium undecoxide, respectively, and mixing and grinding for 8h, then calcining at 1450℃ for 6h, and grinding again for 6h to obtain dispersed Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 powder;

[0051] The obtained powder was molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied and maintained for 15 seconds to obtain Y 1 / 3 Tb 1 / 3Pr 1 / 3 TaO4 ceramic green body material;

[0052] The obtained ceramic embryo was vacuum packaged and cold isostatically pressed at 300 MPa for 2 minutes, then placed in a muffle furnace at 1600 ° C for 8 hours, and cooled to room temperature to obtain a disc-shaped high-density Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 medium entropy ceramic material;

[0053] The obtained disc-shaped high-density ceramic was polished on both sides with 1500-grit fine sandpaper for 1 minute, then ultrasonically cleaned with anhydrous ethanol for 30 minutes, coated with platinum paste electrodes on both sides, and then annealed at 900℃ for 1 hour to obtain a temperature range of 400-1400℃ with a material constant of B. 400℃ / 1400℃ =8538K Y 1 / 3 Tb 1 / 3Pr 1 / 3 TaO4 thermistor material.

[0054] Example 6

[0055] According to the molecular formula YTa 1 / 2 Nb 1 / 2 The molar ratio of O4 was calculated. 19.4382 g of yttrium trioxide, 11.4516 g of niobium pentoxide or 19.1101 g of tantalum pentoxide were weighed and mixed and ground for 8 h. Then, the mixture was calcined at 1450 ° C for 6 h and ground again for 6 h to obtain dispersed YTa 1 / 2 Nb 1 / 2 O4 powder;

[0056] The obtained powder was molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied and maintained for 15 seconds to obtain YTa 1 / 2Nb 1 / 2 O4, ceramic green body material;

[0057] The obtained ceramic green body was vacuum packaged and cold isostatically pressed at 300MPa for 3min, then placed in a muffle furnace at 1500℃ for 8h and cooled to room temperature to obtain a disc-shaped high-density YTa 1 / 2 Nb 1 / 2 O4 ceramic material;

[0058] The obtained disc-shaped high-density ceramic was polished on both sides with 1500-mesh fine sandpaper for 1 minute, then ultrasonically cleaned with anhydrous ethanol for 30 minutes, coated with platinum paste electrodes on both sides, and then annealed at 900℃ for 1 hour to obtain a temperature range of 500-1500℃ with a material constant of B. 500℃ / 1500℃ =16747K YTa 1 / 2 Nb 1 / 2 O4 thermistor material.

[0059] Example 7

[0060] According to the molecular formula YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 The raw materials yttrium trioxide 18.0434g, tungsten trioxide 9.354g, hafnium dioxide 8.418g, niobium pentoxide 5.315g or tantalum pentoxide 8.8694g were weighed and ground for 8h, and then calcined at 1500℃ for 6h and ground again for 6h to obtain dispersed YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 powder;

[0061] The obtained powder was molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied and maintained for 15 seconds to obtain YTa 1 / 4Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 ceramic green body material;

[0062] The obtained ceramic green body was vacuum packaged and cold isostatically pressed at 300MPa for 1min, then placed in a muffle furnace at 1700℃ for 8h and cooled to room temperature to obtain a disc-shaped high-density YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 medium entropy ceramic materials;

[0063] The obtained disc-shaped high-density ceramic was polished on both sides with 1500-mesh fine sandpaper for 1 minute, then ultrasonically cleaned with anhydrous ethanol for 30 minutes, coated with platinum paste electrodes on both sides, and then annealed at 900℃ for 1 hour to obtain a temperature range of 500-1500℃ with a material constant of B. 500℃ / 1500℃ =18438K YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 thermistor material.

Claims

1. A thermistor material suitable for intelligent sensing of the wall surface of a commercial aerospace engine, characterized by: Using the entropy strategy, YTaO4 is doped with yttrium trioxide, terbium heptoxide, tungsten trioxide, hafnium dioxide, dysprosium trioxide, tantalum pentoxide, niobium pentoxide or praseodymium undecoxide in equal proportions at the A and B positions, i.e., Y and Ta positions. 1 / 2 Tb 1 / 2 TaO4, Y 1 / 3Tb 1 / 3 Pr 1 / 3 TaO4, Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4; B position: YTaO4, YTa 1 / 2 Nb 1 / 2 O4, YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4, YTa 1 / 4Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4, the specific operation is as follows: A-site preparation: a. According to molecular formula Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 The molar ratio of TaO4 was calculated, and the raw materials of yttrium trioxide, terbium heptoxide, dysprosium trioxide, tantalum pentoxide or praseodymium undecoxide were weighed and mixed and ground for 6-8 hours, and then calcined at a temperature of 1400℃-1500℃ for 6 hours, and ground again for 6 hours to obtain dispersed Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4 powder; Preparation of position B: b. According to the molecular formula YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 The raw materials yttrium trioxide, tungsten trioxide, hafnium dioxide, niobium pentoxide or tantalum pentoxide were weighed and ground for 6-8 hours, and then calcined at 1400℃-1500℃ for 6 hours and ground again for 6 hours to obtain dispersed YTaO4, YTa 1 / 2Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 powder; c. The powders obtained in step a and step b were molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied. After holding the pressure for 15 seconds, Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 ceramic green body material; d. The ceramic green body obtained in step c is vacuum packaged and cold isostatically pressed at 200-300 MPa for 1-3 min, then placed in a muffle furnace at 1500-1700 ° C for 8 h, and cooled to room temperature to obtain a disc-shaped high-density Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4Hf 1 / 4 O4 ceramic material; e. The disc-shaped high-density ceramic obtained in step d was polished on both sides with 1500-mesh fine sandpaper for 1 minute, and then ultrasonically cleaned with anhydrous ethanol for 30 minutes. Platinum slurry electrodes were coated on both sides, and then annealed at 900°C for 1 hour to obtain Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 thermistor material, of which Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 The temperature ranges of O4 are 200-1500℃ and 400-1500℃ respectively, and the material constant is B 200℃ / 1500℃ = 8913K- 14345K, B 400℃ / 1500℃ =15461K- 17686 K.

2. A method for preparing a thermistor material suitable for intelligent sensing wall surfaces of commercial aerospace engines, characterized by: Follow these steps: A-site preparation: a. According to molecular formula Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 The molar ratio of TaO4 was calculated, and the raw materials of yttrium trioxide, terbium heptoxide, dysprosium trioxide, tantalum pentoxide or praseodymium undecoxide were weighed and mixed and ground for 6-8 hours, and then calcined at a temperature of 1400℃-1500℃ for 6 hours, and ground again for 6 hours to obtain dispersed Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4 or Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4 powder; Preparation of position B: b. According to the molecular formula YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 The raw materials yttrium trioxide, tungsten trioxide, hafnium dioxide, niobium pentoxide or tantalum pentoxide were weighed and ground for 6-8 hours, and then calcined at 1400℃-1500℃ for 6 hours and ground again for 6 hours to obtain dispersed YTaO4, YTa 1 / 2Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 powder; c. The powders obtained in step a and step b were molded into a mold with a diameter of 10 mm, and a pressure of 20 MPa was applied. After holding the pressure for 15 seconds, Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 ceramic green body material; d. The ceramic green body obtained in step c is vacuum packaged and cold isostatically pressed at 200-300 MPa for 1-3 min, then placed in a muffle furnace at 1500-1700 ° C for 8 h, and cooled to room temperature to obtain a disc-shaped high-density Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4Hf 1 / 4 O4 medium entropy ceramic materials; e. The disc-shaped high-density ceramic obtained in step d was polished on both sides with 1500-mesh fine sandpaper for 1 minute, and then ultrasonically cleaned with anhydrous ethanol for 30 minutes. Platinum slurry electrodes were coated on both sides, and then annealed at 900°C for 1 hour to obtain Y 1 / 2 Tb 1 / 2 TaO4、Y 1 / 3 Tb 1 / 3 Pr 1 / 3 TaO4、Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4, YTaO4, YTa 1 / 2 Nb 1 / 2 O4、YTa 1 / 3 Nb 1 / 3 W 1 / 3O4 or YTa 1 / 4 Nb 1 / 4 W 1 / 4 Hf 1 / 4 O4 medium entropy thermistor material, where Y 1 / 4 Tb 1 / 4 Pr 1 / 4 Dy 1 / 4 TaO4、YTa 1 / 3 Nb 1 / 3 W 1 / 3 The temperature ranges of O4 are 200-1500℃ and 400-1500℃ respectively, and the material constant is B 200℃ / 1500℃ = 8913K- 14345K, B 400℃ / 1500℃ =15461K- 17686 K.

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