Rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of aero-engine and preparation method thereof

Abstract

The invention relates to a rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of an aero-engine and a preparation method thereof, the thermistor takes holmium oxide, erbium trioxide, thulium trioxide, ytterbium trioxide, lutetium trioxide and tantalum pentoxide as raw materials, the chemical composition is RETaO4, Ln = Ho, Er, Tm, Yb, Rm = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17 The material constant B value range is 10565-15673 K, the resistivity is 2.20 * 10 < 5 >-1.295 * 10 < 6 > omega.cm at the temperature of 500 DEG C, the linear determination coefficient R2 of ln rho and 1000 / T is greater than 99%, the resistance drift rate is between 3.01% and 60%, and the absolute value of the resistance drift rate of (HoErTmYbLu) 1 / 5TaO4 after aging for 50 hours at the temperature of 1500 DEG C is less than 3.01%. The high-temperature thermistor prepared by the preparation method is stable in resistance performance and good in consistency, has an excellent negative temperature coefficient thermosensitive characteristic in a wide temperature range of 400-1500 DEG C, and is suitable for manufacturing a high-performance high-temperature thermistor suitable for temperature measurement and control of an aero-engine.

Description

Technical Field

[0001] The present invention relates to a rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of aeroengines and a preparation method thereof. Background Art

[0002] With the development of aeroengines towards high bypass ratio, high thrust-to-weight ratio, and high turbine inlet temperature, the working temperature of the hot-end components of the engine is getting higher and higher. In particular, the gas temperature and gas pressure in the combustion chamber are continuously increasing. Currently, the combustion chamber temperature of civil turbofan engines has reached 1400 °C and may reach 1500 °C in the future. The temperature measurement and control technology for the hot-end temperature of the engine, as the core support for the research and development of the propulsion system, runs through the entire life cycle from pre-research verification to engineering application. It is mainly divided into two dimensions: First, the real-time measurement and control of the hot-end temperature field of the engine can accurately know the working state of the engine and timely understand the abnormal conditions of the engine body and its interior, which is an important guarantee for the design and application safety of the engine. Second, the combustion chamber temperature of the turbofan engine is close to 1400 °C, and the highest peak temperature at the tail pipe is about 1000 °C. By quickly measuring and controlling the temperature, the matching situation between the current working temperature and the optimal working temperature of the engine can be known, and the fuel-air mixture ratio can be adjusted to improve the fuel efficiency. Therefore, it is crucial to develop a new type of high-performance high-temperature negative temperature coefficient (NTC) thermistor with a high temperature limit.

[0003] The next-generation advanced high-temperature temperature sensors largely rely on negative temperature coefficient (NTC) thermistor ceramics with low cost, long life, small volume, and fast response. However, compared with medium- and low-temperature thermistor ceramics, the development of high-temperature thermistor ceramics has always been restricted by problems such as low measurement and control accuracy and poor repeatability, mainly due to the accumulation of lattice distortion and the influence of phase change on ion migration at high temperatures. The progress of technology has put more stringent requirements on the performance of sensors. Therefore, in order to ensure that the performance of high-temperature thermistor ceramics can meet the demanding temperature measurement requirements of high precision, high sensitivity, and high stability, the ideal thermistor ceramics must simultaneously possess the following characteristics: typical NTC characteristics, high melting point, single conduction mode, alternating distribution of tensile and compressive strains in the lattice at the microscopic level, high resistivity, and material constant. It is easy for current thermistor ceramics to meet one or two of the above requirements, but it is difficult to meet all the conditions at the same time, which undoubtedly promotes the exploration of new materials by researchers.

[0004] RETaO4 (where RE = Ho-Er) ceramics are monoclinic structures (m-phases) with ferroelastic phase transitions and belong to the C2 / c space group. RETaO4 (where RE = Tm-Lu) ceramics are monoclinic structures (m'-phases) without ferroelastic phase transitions and belong to the P2 / c space group. RETaO4 (where RE = Ho-Lu) ceramics exhibit high melting points and high-temperature semiconductivity, and have attracted much attention for their ability to maintain high chemical and physical stability in harsh high-temperature environments. In the lattice of the m-phase, the 4-coordinated B-site cations (Ta) form distorted [TaO4] tetrahedra, while the A-site cations (RE) occupy [REO8] polyhedra, in which [TaO4] are independent of each other. In the lattice of the m'-phase, the 6-coordinated B-site cations (Ta) form distorted [TaO6] octahedra, while the A-site cations (RE) occupy [REO8] polyhedra, in which the [TaO6] octahedra are interconnected by oxygen ions. The migration of oxygen ions in oxide ion conductors is a thermally activated process that depends only on temperature. Therefore, the oxygen ion mobility increases with increasing temperature, resulting in a gradual decrease in resistivity, showing a typical negative temperature coefficient (NTC) behavior. In addition, the high material constant and resistivity at high temperatures are sufficient to ensure excellent sensitivity. Moreover, the microscopic strain distribution of this series of ceramics can be regulated by the introduction of high entropy strategies and atomic-level strain, stabilizing the electrical properties and structural stability of the material. In this way, high-performance high-temperature thermistor materials with a high temperature upper limit can be obtained. Summary of the invention

[0005] The object of the present invention is to provide a rare earth oxide high temperature thermistor material suitable for aircraft engine temperature measurement and control and a preparation method thereof. The resistor is prepared by mixing and grinding, pre-sintering, cold isostatic pressing, high temperature sintering, and coating electrodes with raw materials of holmium trioxide, erbium trioxide, thulium trioxide, ytterbium trioxide or lutetium trioxide and tantalum pentoxide, respectively, to obtain a material constant B in the range of 10565-15673K and a resistivity of 2.2×10 5 –1.295×10 6 Linear determination coefficient R of Ω.cm, lnρ and 1000 / T 2 The aging resistance drift rate of the rare earth oxide high temperature thermistor is 3.01-60% after aging at 1400-1500℃ for 500 hours. The resistor has stable performance and good consistency. It has excellent negative temperature coefficient characteristics in a wide temperature range of 400-1500℃ and is suitable for manufacturing high temperature thermistors.

[0006] A rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of aero-engines. The chemical composition of the thermistor material is RETaO4, where RE = Ho, Er, Tm, Yb, Lu. It is made from the raw materials holmium oxide, erbium oxide, thulium oxide, ytterbium oxide or lutetium oxide and tantalum pentoxide respectively. The ceramic material structure is a monoclinic structure. The specific operation is carried out according to the following steps:

[0007] a. According to the chemical composition RETaO4, where RE = Ho, Er, Tm, Yb, Lu, weigh holmium oxide, erbium oxide, thulium oxide, ytterbium oxide or lutetium oxide, and respectively mix and grind them with tantalum pentoxide in an agate mortar for 7 - 9 h. Then calcine at a temperature of 1200 - 1300 °C for 5 - 7 h, and grind again for 7 - 9 h to obtain a dispersed single-phase RETaO4-based powder;

[0008] Or according to the molar ratio of (HoErTmYbLu) 1 / 5 TaO4, weigh holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and tantalum pentoxide respectively, mix and grind them in an agate mortar for 7 - 9 h. Then calcine at a temperature of 1200 - 1300 °C for 5 - 7 h, and grind again for 7 - 9 h to obtain a dispersed powder;

[0009] b. Press the RETaO4-based powder obtained in step a into blocks at a pressure of 15 - 25 Kg / cm 2 for 3 - 5 minutes. Cold isostatic press the formed blocks, keep the pressure at 250 - 350 MPa for 4 - 6 minutes, and then sinter at a temperature of 1450 - 1550 °C for 10 - 14 hours to obtain a circular high-density ceramic block of the RETaO4-based system;

[0010] c. Coat the front and back sides of the circular high-density ceramic block sintered in step b with high-temperature platinum paste electrodes, and then anneal at a temperature of 1400 - 1500 °C for 25 hours, that is, obtain a rare earth oxide high-temperature thermistor with an applicable temperature range of 400 - 1400 °C, 400 - 1450 °C and 400 - 1500 °C respectively, the range of the material constant B value is 10565 - 15673 K, the resistivity at a temperature of 500 °C is 2.2×10 5 –1.295×10 6 Ω·cm, the linear determination coefficient R 2 between lnρ and 1000 / T is 987.89 - 999.17‰, and after aging at a temperature of 1400 - 1500 °C for 500 hours, the aging resistance drift rate is 3.01 - 60%.

[0011] A preparation method of a rare earth oxide high-temperature thermistor material applicable to temperature measurement and control of aero-engines is carried out according to the following steps:

[0012] a. According to the chemical composition of RETaO4, where RE = Ho, Er, Tm, Yb, Lu, weigh out holmium oxide, erbium oxide, thulium oxide, ytterbium oxide or lutetium oxide, and place them in an agate mortar respectively to mix and grind with tantalum pentoxide for 7 - 9 h. Then calcine at a temperature of 1200 - 1300 °C for 5 - 7 h, and grind again for 7 - 9 h to obtain a dispersed single-phase RETaO4-based powder;

[0013] Or according to the molar ratio of (HoErTmYbLu) 1 / 5 TaO4, weigh out holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and tantalum pentoxide respectively, place them in an agate mortar to mix and grind for 7 - 9 h. Then calcine at a temperature of 1200 - 1300 °C for 5 - 7 h, and grind again for 7 - 9 h to obtain a dispersed powder;

[0014] b. Press the RETaO4-based powder obtained in step a into a block at a pressure of 15 - 25 Kg / cm 2 for 3 - 5 minutes. Cold isostatic press the formed block, keep the pressure at 250 - 350 MPa for 4 - 6 minutes, and then sinter at a temperature of 1450 - 1550 °C for 10 - 14 hours to obtain a disc-shaped high-density ceramic block;

[0015] c. Coat the front and back sides of the disc-shaped high-density ceramic block sintered in step b with a high-temperature platinum paste electrode, and then anneal at a temperature of 1500 °C for 25 hours to obtain a rare earth oxide high-temperature thermistor with an applicable temperature range of 400 - 1400 °C, 400 - 1450 °C and 400 - 1500 °C respectively, the range of material constant B is 10565 - 15673 K, the resistivity at a temperature of 500 °C is 2.2×10 5 –1.295×10 6 Ω·cm, the linear determination coefficient R 2 of lnρ and 1000 / T is 987.89 - 999.17‰, and the aging resistance drift rate is 3.01 - 60% after aging at a temperature of 1400 - 1500 °C for 500 hours.

[0016] The rare earth oxide high-temperature thermistor material applicable to temperature measurement and control of aero-engines and its preparation method according to the present invention can be used to manufacture a high-performance high-temperature thermistor with a high temperature upper limit and adjustable performance.

[0017] A rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of aeroengines and a preparation method thereof. The thermistor has a chemical composition of RETaO4, where RE = Ho, Er, Tm, Yb, Lu. Using holmium sesquioxide, erbium sesquioxide, thulium sesquioxide, ytterbium sesquioxide or lutetium sesquioxide as raw materials respectively and tantalum pentoxide, through mixing and grinding, calcination, cold isostatic pressing, high-temperature sintering, and firing electrodes, a high-performance high-temperature thermistor with a high temperature upper limit can be obtained. At the same time, the internal structure such as composition, configurational entropy, and lattice distortion can be adjusted, and the migration rate of oxygen ions can be regulated to adjust the electrical properties of the RETaO4-based thermistor, so as to manufacture a thermistor with adjustable electrical properties.

[0018] Based on the semiconductor characteristics, high-temperature resistance characteristics, high melting point, and high resistivity of RETaO4 ceramics, a high-performance high-temperature RETaO4-based thermistor with a high upper limit temperature that can be used at 400 - 1500 °C is designed and synthesized through a high-entropy strategy.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0020] The rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of aeroengines and the preparation method thereof. The RETaO4-based thermistor has excellent negative temperature coefficient characteristics in a wide range of 400 - 1400 °C, 400 - 1450 °C, and 400 - 1500 °C respectively. The material constant B value ranges from 10565 - 15673 K. The resistivity at a temperature of 500 °C is 2.2×105–1.295×106 Ω·cm. The linear determination coefficient R of lnρ and 1000 / T 2 is greater than 99%, and the highest can reach 999.17‰. After aging at a temperature of 1400 - 1500 °C for 500 hours, the resistance drift rate is 3.01 - 60%, and the lowest can reach 3.01%. It is a new type of high-performance high-temperature thermistor suitable for manufacturing with a high upper limit temperature.

[0021] The rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of aeroengines and the preparation method thereof. Using solid-phase method with oxides of holmium, erbium, thulium, ytterbium, lutetium or tantalum as raw materials, with a chemical composition of RETaO4, where RE = Ho, Er, Tm, Yb, Lu, weighing and mixing, grinding, calcining, and mixing again to obtain a negative temperature coefficient thermistor powder. Then, the powder is pressed into a block, cold isostatically pressed, and sintered at high temperature, and high-temperature platinum paste electrodes are fired on both the front and back sides to obtain a high-temperature thermistor. The range of the material constant B of this thermistor is 10565 - 15673 K, and the resistivity at a temperature of 500 °C is 2.2×10 5 –1.295×10 6The linear determination coefficient R of Ω.cm, lnρ and 1000 / T 2 is 987.89 - 999.17‰. The high-temperature thermistor, with a temperature range of 1400 - 1500°C and aged for 500 hours, has an aging resistance drift rate of 3.01 - 60%. It has the advantages of stable performance, high precision, high sensitivity, and good consistency. The (HoErTmYbLu) 1 / 5 TaO4 thermistor has excellent thermosensitive characteristics in the temperature range of 400 - 1500°C and is suitable for manufacturing high-performance thermistors. The specific performance parameters are shown in Table 1;

[0022] Table 1

[0023] Brief Description of the Drawings

[0024] Figure 1 is the X-ray diffraction pattern of the thermistor material of the present invention;

[0025] Figure 2 is the resistance-temperature characteristic curve of the thermistor of the present invention. Detailed Description of the Invention

[0026] Example 1

[0027] Preparation of HoTaO4 high-temperature thermistor:

[0028] a. According to the composition of HoTaO4, weigh the raw materials holmium oxide and tantalum pentoxide respectively, place them in an agate mortar and mix, grind for 7 hours, then calcine at 1200°C for 7 hours, and grind again for 9 hours to obtain a dispersed single-phase HoTaO4 powder;

[0029] b. Press the powder obtained in step a into a block at a pressure of 15 Kg / cm 2 for 5 minutes. Then, perform cold isostatic pressing on the formed block, maintain the pressure at 250 MPa for 6 minutes, and then sinter at 1450°C for 14 hours to obtain a disc-shaped high-density ceramic;

[0030] c. Coat the front and back sides of the disc-shaped high-density ceramic block sintered in step b with high-temperature platinum paste electrodes, and then anneal at 1400°C for 25 hours to obtain a HoTaO4 high-temperature thermistor with a temperature range of 400 - 1400°C, a material constant B = 15673 K, a resistivity of 1.295×10 6 Ω.cm, and a linear determination coefficient of lnρ and 1000 / T of 999.17‰; after aging at 1400°C for 500 hours, the fluctuation of the absolute value of the resistance deviation is less than 60%.

[0031] Example 2

[0032] Preparation of ErTaO4 High-Temperature Thermistor:

[0033] a. Weigh the raw materials erbium sesquioxide and tantalum pentoxide respectively according to the composition of ErTaO4, place them in an agate mortar for mixing, grind for 7.5 h, then calcine at 1200 °C for 6.5 h, and grind again for 8.5 h to obtain a dispersed single-phase ErTaO4 powder.

[0034] b. Press the powder obtained in step a into a block at a pressure of 17.5 Kg / cm 2 for 3.5 minutes. Perform cold isostatic pressing on the formed block, keep the pressure at 275 MPa for 4.5 minutes, and then sinter at 1450 °C for 14 hours to obtain a disc-shaped high-density ceramic block.

[0035] c. Coat the front and back sides of the disc-shaped high-density ceramic block sintered in step b with a high-temperature platinum paste electrode, and then anneal at 1400 °C for 25 hours to obtain an ErTaO4 high-temperature thermistor with a temperature range of 400 - 1400 °C, material constant B = 14396 K, resistivity at 500 °C of 3.89×10 5 Ω·cm, and a linear determination coefficient of lnρ and 1000 / T of 998.76‰; after aging at 1400 °C for 500 hours, the absolute value fluctuation of the resistance deviation is less than 70%.

[0036] Example 3

[0037] Preparation of TmTaO4 High-Temperature Thermistor:

[0038] a. Weigh erbium sesquioxide and tantalum pentoxide respectively according to the composition of TmTaO4, place them in an agate mortar for mixing, grind for 8 h, then calcine at 1250 °C for 6.5 h, and grind again for 8.5 h to obtain a dispersed single-phase TmTaO4 powder.

[0039] b. Press the powder obtained in step a into a block at a pressure of 19 Kg / cm 2 for 4 minutes. Perform cold isostatic pressing on the formed block, keep the pressure at 275 MPa for 5 minutes, and then sinter at 1500 °C for 13 hours to obtain a disc-shaped high-density ceramic block.

[0040] c. Coat the front and back sides of the disc-shaped high-density ceramic block sintered in step b with a high-temperature platinum paste electrode, and then anneal at 1450 °C for 25 hours to obtain a TmTaO4 high-temperature thermistor with a temperature range of 400 - 1450 °C, material constant B = 11877 K, resistivity at 500 °C of 2.31×10 5The high-temperature thermistor of TmTaO4 with a linear determination coefficient of 987.89‰ for Ω.cm, lnρ and 1000 / T; after aging at 1450 °C for 500 hours, the absolute value fluctuation of the resistance deviation is less than 20%.

[0041] Example 4

[0042] Prepare the high-temperature thermistor of YbTaO4:

[0043] a. Weigh ytterbium oxide and tantalum pentoxide respectively according to the composition of YbTaO4, place them in an agate mortar for mixing, grind for 9 h, then calcine at 1300 °C for 5 h, and grind again for 9 h to obtain dispersed single-phase YbTaO4 powder;

[0044] b. Press the powder obtained in step a into a compact at a pressure of 20 Kg / cm 2 for 5 minutes. Cold isostatic pressing is carried out on the formed block, and it is kept under pressure at 275 MPa for 5 minutes, and then sintered at 1500 °C for 11 hours to obtain a disc-shaped high-density ceramic block;

[0045] c. Coat the front and back sides of the disc-shaped high-density ceramic block sintered in step b with high-temperature platinum paste electrodes, and then anneal at 1450 °C for 25 hours to obtain a high-temperature thermistor of YbTaO4 with a temperature range of 400 - 1450 °C, material constant B = 11761 K, resistivity of 3.89×10 5 Ω.cm, and a linear determination coefficient of 988.75‰ for lnρ and 1000 / T; after aging at 1450 °C for 500 hours, the absolute value fluctuation of the resistance deviation is less than 50%.

[0046] Example 5

[0047] Prepare the high-temperature thermistor of LuTaO4:

[0048] a. Weigh lutetium oxide and tantalum pentoxide respectively according to the composition of LuTaO4, place them in an agate mortar for mixing, grind for 7 h, then calcine at 1200 °C for 7 h, and grind again for 8 h to obtain dispersed single-phase LuTaO4 powder;

[0049] b. Press the powder obtained in step a into a compact at a pressure of 20.5 Kg / cm 2 for 4 minutes. Cold isostatic pressing is carried out on the formed block, and it is kept under pressure at 320 MPa for 6 minutes, and then sintered at 1500 °C for 10 hours to obtain a disc-shaped high-density ceramic block;

[0050] c. Coat the front and back sides of the sintered disc-shaped high-density ceramic block obtained in step b with high-temperature platinum paste electrodes, and then anneal at a temperature of 1450 °C for 25 hours to obtain a LuTaO4 high-temperature thermistor with a temperature range of 400 - 1450 °C, a material constant B = 10565 K, a resistivity of 6.08×10 5 Ω·cm at a temperature of 500 °C, and a linear determination coefficient of lnρ and 1000 / T of 996.29‰; after aging at a temperature of 1450 °C for 500 hours, the absolute value fluctuation of the resistance deviation is less than 40%.

[0051] Example 6

[0052] Prepare (HoErTmYbLu) 1 / 5 TaO4 high-temperature thermistor

[0053] a. Weigh holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and tantalum pentoxide respectively according to the molar ratio of (HoErTmYbLu) 1 / 5 TaO4, place them in an agate mortar and mix and grind for 9 h, then calcine at a temperature of 1300 °C for 7 h and grind again for 9 h to obtain a dispersed single-phase (HoErTmYbLu) 1 / 5 TaO4 powder;

[0054] b. Press the powder obtained in step a into a block at a pressure of 25 Kg / cm 2 for 5 minutes. Cold isostatic press the formed block, keep the pressure at 350 MPa for 4 minutes, and then sinter at a temperature of 1550 °C for 14 hours to obtain a disc-shaped high-density ceramic block;

[0055] c. Coat the front and back sides of the sintered disc-shaped high-density ceramic block obtained in step b with high-temperature platinum paste electrodes, and then anneal at a temperature of 1500 °C for 25 hours to obtain a (HoErTmYbLu) 5 TaO4 high-temperature thermistor with a temperature range of 400 - 1500 °C, a material constant B = 12074 K, a resistivity of 2.20×10 1 / 5 Ω·cm at a temperature of 500 °C, and a linear determination coefficient of lnρ and 1000 / T of 996.2‰;

[0056] After aging at a temperature of 1500 °C for 50 hours, the resistance drift rate starts to stabilize, and the absolute value of the resistance deviation is less than or equal to 3.01%.

[0057] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto.

Claims

1. A rare earth oxide high-temperature thermistor material applicable to temperature measurement and control of aeroengines, characterized in that The chemical composition of the thermistor material is RETaO4, where RE = Ho, Er, Tm, Yb, Lu, which is made from the raw materials holmium oxide, erbium oxide, thulium oxide, ytterbium oxide or lutetium oxide and tantalum pentoxide respectively. The ceramic material structure is monoclinic. The specific operation is carried out according to the following steps: a. According to the chemical composition RETaO4, where RE = Ho, Er, Tm, Yb, Lu, weigh holmium oxide, erbium oxide, thulium oxide, ytterbium oxide or lutetium oxide, and mix them with tantalum pentoxide in an agate mortar respectively. Grind for 7 - 9 h, then calcine at a temperature of 1200 - 1300 °C for 5 - 7 h, and grind again for 7 - 9 h to obtain a dispersed single-phase RETaO4-based powder; or according to the molar ratio of (HoErTmYbLu) 1 / 5 Weigh holmium(III) oxide, erbium(III) oxide, thulium(III) oxide, ytterbium(III) oxide, lutetium(III) oxide and tantalum pentoxide respectively according to the molar ratio of TaO4, put them into an agate mortar, mix and grind for 7-9 h, then calcine at a temperature of 1200-1300 °C for 5-7 h, and grind again for 7-9 h to obtain a dispersed powder; b. Press the RETaO4-based powder obtained in step a into compacts at a pressure of 15 - 25 Kg / cm 2 for 3 - 5 minutes. Then, subject the formed compacts to cold isostatic pressing, hold the pressure at 250 - 350 MPa for 4 - 6 minutes, and then sinter at a temperature of 1450 - 1550 °C for 10 - 14 hours to obtain disk-shaped high-density ceramic compacts of the RETaO4 system; c. Coat the front and back sides of the sintered disc-shaped high-density ceramic block in step b with high-temperature platinum paste electrodes, and then anneal at a temperature of 1400 - 1500 °C for 25 hours to obtain rare-earth oxide high-temperature thermistors with applicable temperature ranges of 400 - 1400 °C, 400 - 1450 °C, and 400 - 1500 °C respectively, a material constant B value in the range of 10565 - 15673 K, a resistivity of 2.2×10 5 – 1.295×10 6 Ω·cm, ln ρ and 1000 / T with a linear determination coefficient R 2 of 987.89 - 999.17 ‰, aged at a temperature of 1400 - 1500 °C for 500 hours, and an aging resistance drift rate of 3.01 - 60 %.

2. A preparation method of a rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of aeroengines, characterized in that The following steps are carried out: a. According to the chemical composition RETaO4, where RE = Ho, Er, Tm, Yb, Lu, weigh holmium oxide, erbium oxide, thulium oxide, ytterbium oxide or lutetium oxide, and place them with tantalum pentoxide in an agate mortar for mixing and grinding for 7 - 9 h. Then calcine at a temperature of 1200 - 1300 °C for 5 - 7 h, and grind again for 7 - 9 h to obtain a dispersed single-phase RETaO4-based powder; Or by (HoErTmYbLu) 1 / 5 According to the molar ratio of TaO4, respectively weigh holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and tantalum pentoxide, place them in an agate mortar and mix and grind for 7-9 h, then calcine at a temperature of 1200-1300 °C for 5-7 h, and grind again for 7-9 h to obtain a dispersed powder; b. Press the RETaO4-based powder obtained in step a into compacts at a pressure of 15 - 25 Kg / cm 2 respectively for 3 - 5 minutes. Isostatically cold press the formed compacts, hold the pressure at 250 - 350 MPa for 4 - 6 minutes, and then sinter at a temperature of 1450 - 1550 °C for 10 - 14 hours to obtain disc-shaped high-density ceramic compacts; c. Coat the front and back sides of the sintered disc-shaped high-density ceramic block in step b with high-temperature platinum paste electrodes, and then anneal at 1500 °C for 25 hours to obtain rare earth oxide high-temperature thermistors with applicable temperature ranges of 400 - 1400 °C, 400 - 1450 °C, and 400 - 1500 °C respectively, a material constant B in the range of 10565 - 15673 K, a resistivity of 2.2×10 5 – 1.295×10 6 Ω·cm, ln ρ and 1000 / T with a linear determination coefficient R 2 of 987.89 - 999.17 ‰, aged at 1400 - 1500 °C for 500 hours, and with an aging resistance drift rate of 3.01 - 60 %.

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