CN117819968A - Negative temperature coefficient thermosensitive ceramic material in high temperature area and preparation method thereof - Google Patents
Negative temperature coefficient thermosensitive ceramic material in high temperature area and preparation method thereof Download PDFInfo
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- 229910010293 ceramic material Inorganic materials 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 31
- 239000010955 niobium Substances 0.000 claims abstract description 28
- 229910017414 LaAl Inorganic materials 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 22
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000032683 aging Effects 0.000 claims abstract description 21
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims abstract description 14
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000137 annealing Methods 0.000 claims abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 238000009694 cold isostatic pressing Methods 0.000 claims abstract description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 238000001354 calcination Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 2
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 238000003746 solid phase reaction Methods 0.000 abstract description 2
- 239000000919 ceramic Substances 0.000 description 11
- 239000004065 semiconductor Substances 0.000 description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000462 isostatic pressing Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a negative temperature coefficient thermal sensitive ceramic material in a high temperature area and a preparation method thereof. The thermosensitive ceramic material LaAl 1‑ x Nb x O 3 Is prepared by a solid phase reaction method. Weighing the following raw materials in percentage by weight: 73.315-76.112% of lanthanum oxide, 20.701-23.888% of aluminum oxide and 1.540-5.985% of niobium pentoxide; the preparation method comprises the following steps: s1, weighing; s2, mixing; s3, grinding; s4, presintering; s5, secondary grinding; s6, tabletting and forming; s7, cold isostatic pressing; s8, sintering; s9, coating platinum slurry; s10, annealing. The negative temperature coefficient thermal sensitive ceramic material in the high temperature area has a wider temperature range (600-1400 ℃), and has excellent performanceAgeing stability of LaAl after ageing at high temperature 1000 ℃ for 400-600 hours 1‑x Nb x O 3 The resistivity drift rate of the sample is 0.906-3.352%, and the service life is long; in addition, the powder particles prepared by the method have high dispersity, are not suitable for agglomeration and have high material strength.
Description
Technical Field
The invention belongs to the technical field of heat-sensitive materials, and particularly relates to a negative temperature coefficient heat-sensitive ceramic material in a high temperature area and a preparation method thereof.
Background
The semiconductor ceramic, which is referred to as semiconductor ceramic for short, refers to a material with semiconductor characteristics, which is manufactured by using a ceramic process. The semiconductor material has conductivity between the metal and the insulator, and has conductivity of about 10 -10 -10 3 Ω -1 cm -1 And its conductivity may vary significantly under the influence of external conditions such as temperature, light, atmosphere, humidity, etc. Due to the characteristics of the semiconductor material, the semiconductor material can convert the change of external physical quantity into an electric signal which is convenient to process, so that the sensor device with various purposes can be manufactured. The semiconductor ceramic is classified into a thermosensitive ceramic, a pressure sensitive ceramic, a photosensitive ceramic, a gas sensitive ceramic, a humidity sensitive ceramic, and the like, from the field of the sensitive element.
When the external temperature changes, the resistance of the semiconductor porcelain changes in various ways. Wherein PTC (positive temperature coefficient thermistor), NTC (negative temperature coefficient thermistor) and CTR (critical temperature coefficient thermistor) can be classified according to the relation between resistivity and temperature. Compared with PTC and CTR thermistors, the NTC thermal resistor has a series of advantages of small volume, quick response, high measurement precision, low cost and the like, and has very important application value in the fields of automobile exhaust temperature control systems, household appliances, aviation and the like. At present, a large number of perovskite materials are mainly applied to a temperature region with the temperature higher than 300 ℃ due to the unique crystal structure and changeable crystal adjustability, and become research hot spots in the field of NTC in recent years. Meanwhile, the niobium element has variable electronic valence state, so that a structural basis can be provided for optimizing the electrical property of the material. With the continuous development of technology, the NTC heat-sensitive material applied to the high temperature area has a certain limitation in aging stability, and the resistance drift rate is higher after the NTC heat-sensitive material is used for a period of time in a high temperature environment, so that in order to prolong the service life of the NTC heat-sensitive element, the development of the application field of the NTC heat-sensitive element and the development of the heat-sensitive material with excellent stability are very important.
Disclosure of Invention
The invention aims to provide a novel negative temperature coefficient thermal sensitive ceramic material in a high temperature region and a preparation method thereof.
The invention provides a negative temperature coefficient thermal sensitive ceramic material in a high temperature area, wherein the chemical composition of the thermal sensitive ceramic material is LaAl 1-x Nb x O 3 Wherein x=0.025-0.10.
Preferably, the thermosensitive ceramic material is mainly prepared from the following raw materials in percentage by weight: 73.315-76.112% of lanthanum trioxide, 20.701-23.888% of aluminum oxide and 1.540-5.985% of niobium pentoxide.
Preferably, the obtained thermosensitive ceramic material has a resistivity of 68971.9-151582.3 Ω & cm at 1000 ℃, and a resistivity drift DeltaR/R after aging for 400-600 hours at 1000 ℃ 0 (%) is 0.906-3.352%.
The invention provides a preparation method of a negative temperature coefficient thermal sensitive ceramic material in a high temperature region, which comprises the following steps:
a. respectively weighing raw materials of lanthanum oxide, aluminum oxide and niobium pentoxide, mixing, and grinding the mixture to obtain powder;
b. calcining the powder obtained in the step a, and grinding to obtain LaAl 1-x Nb x O 3 Powder, wherein x=0.025-0.10;
c. b, obtaining LaAl in the step b 1-x Nb x O 3 The powder material is pressed into blocks to be formedCold isostatic pressing is carried out on the block material, and then sintering is carried out, so that the high-temperature heat-sensitive ceramic material is prepared;
d. and c, coating electrodes on the front and back sides of the high-temperature ceramic material sintered in the step c, and then annealing to obtain the negative temperature coefficient thermal sensitive ceramic material in the high-temperature region.
Preferably, in the step a, 73.315 to 76.112 weight percent of lanthanum oxide, 20.701 to 23.888 weight percent of aluminum oxide and 1.540 to 5.985 weight percent of niobium pentoxide are respectively weighed and mixed, and the mixture is ground in a mortar for 6 to 10 hours.
Preferably, in step b, the calcination temperature is 1205-1350 ℃, the calcination time is 8-12 hours, and the grinding is 6-8 hours.
Preferably, in step c, the pressure of the briquette forming is 10-20Kg/cm 2 The time is 1-2min, the formed block material is subjected to cold isostatic pressing, and the pressure is maintained for 3-5min under the pressure of 250-350 MPa; the sintering temperature is 1500-1550 ℃ and the sintering time is 15-25 hours.
Preferably, in the step d, the front and back sides of the high-temperature ceramic material are coated with platinum slurry electrodes; the annealing temperature is 900-950 ℃ and the annealing time is 30-45min.
Compared with the prior art, the invention has the advantages that:
the thermal sensitive ceramic material takes lanthanum oxide, aluminum oxide and niobium pentoxide as raw materials, and the thermal sensitive ceramic material is prepared by mixing, grinding, calcining, cold isostatic pressing, high-temperature sintering and electrode coating, and has resistivity of 68971.9-151582.3 ohm cm at 1000 ℃, and resistivity drift rate delta R/R after aging for 400-600 hours at high temperature 1000 DEG C 0 (%) is 0.906-3.352% of high-temperature zone negative temperature coefficient heat-sensitive ceramic material. The resistance material has stable performance and good consistency, has obvious negative temperature coefficient characteristic at the temperature of 600-1400 ℃, and is suitable for manufacturing high-temperature heat-sensitive resistance elements. In addition, the powder particles prepared by the method have high dispersity, are not suitable for agglomeration and have high material strength.
Drawings
FIG. 1 is an XRD pattern for examples 1-5 of the present invention;
FIG. 2 shows the niobium doping results of examples 1-5 of the present inventionSample LaAl 1-x Nb x O 3 Is a graph of aging relationship.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings and examples.
Example 1
The invention provides a preparation method of a negative temperature coefficient thermal sensitive ceramic material in a high temperature region, which comprises the following steps:
a. according to LaAl 1-x Nb x O 3 The stoichiometric ratio of (x=0.025) is respectively 75.4 percent of lanthanum trioxide, 23.06 percent of aluminum trioxide and 1.54 percent of niobium pentoxide according to the weight percentage, and the powder is obtained after grinding for 8 hours;
b. calcining the powder ground in the step a at 1300 ℃ for 10 hours, and grinding for 6 hours to obtain LaAl 1- x Nb x O 3 (x=0.025) powder;
c. the powder material obtained in the step b is processed by 15Kg/cm 2 Briquetting for 1.5min, cold isostatic pressing the formed block material, maintaining the pressure at 300MPa for 3min, and sintering at 1525 ℃ for 20 h to obtain the high-temperature heat-sensitive ceramic material;
d. coating the front and back sides of the ceramic material sintered in the step c with platinum slurry electrodes, and then annealing for 30 minutes at 900 ℃ to obtain the ceramic material with negative temperature coefficient characteristics in the temperature range of 600 ℃ to 1400 ℃, wherein the resistivity of the ceramic material at 1000 ℃ is 151582.3 Ω & cm, and the resistivity drift rate delta R/R after aging for 500 hours at high temperature 1000 DEG C 0 (%) is 1.967% of high-temperature zone negative temperature coefficient heat-sensitive ceramic material.
Example 2
a. According to LaAl 1-x Nb x O 3 The stoichiometric ratio of (x=0.05) is respectively 74.69 percent of lanthanum trioxide, 22.26 percent of aluminum trioxide and 3.05 percent of niobium pentoxide according to the weight percentage, and the mixture is put into an agate mortar for grinding for 7 hours to obtain powder;
b. calcining the powder ground in the step a at 1330 ℃ for 9 hours, and grinding for 7 hours to obtain LaAl 1- x Nb x O 3 (x=0.05) powder;
c. the powder material obtained in the step b is processed by 18Kg/cm 2 Briquetting for 1.5min, cold isostatic pressing the formed block material, maintaining the pressure for 3.5min under 300MPa, and sintering at 1525 ℃ for 20 h to obtain the high-temperature heat-sensitive ceramic material;
d. coating the front and back sides of the ceramic material sintered in the step c with platinum slurry electrodes, and then annealing at 920 ℃ for 35 minutes to obtain the ceramic material with negative temperature coefficient characteristics in the temperature range of 600 ℃ to 1400 ℃, wherein the resistivity of the material at 1000 ℃ is 84998.9 Ω & cm, and the resistivity drift rate delta R/R after aging for 550 hours at high temperature 1000 DEG C 0 (%) is 3.352% of high-temperature zone negative temperature coefficient heat-sensitive ceramic material.
Example 3
a. According to LaAl 1-x Nb x O 3 The stoichiometric ratio of (x=0.075) is respectively measured as 73.995 percent of lanthanum trioxide, 21.475 percent of aluminum trioxide and 4.53 percent of niobium pentoxide according to the weight percentage, and the mixture is placed in an agate mortar for grinding for 9 hours to obtain powder;
b. calcining the powder ground in the step a at 1350 ℃ for 10 hours, and grinding for 8 hours to obtain LaAl 1- x Nb x O 3 (x=0.075) powder;
c. the powder material obtained in the step b is processed by 20Kg/cm 2 The block material is pressed into blocks for 2min, the formed block material is subjected to cold isostatic pressing, the pressure is maintained for 3min under 320MPa, and then the block material is sintered for 25 h at the temperature of 1530 ℃ to obtain the high-temperature heat-sensitive ceramic material;
d. coating the front and back sides of the ceramic material sintered in the step c with platinum slurry electrodes, and then annealing at 920 ℃ for 40 minutes to obtain the ceramic material with negative temperature coefficient characteristics in the temperature range of 600 ℃ to 1400 ℃, wherein the resistivity of the material at 1000 ℃ is 118363.4 Ω & cm, and the resistivity drift rate delta R/R after aging at high temperature 1000 ℃ for 500 hours 0 (%) is 1.531% of high-temperature zone negative temperature coefficient heat-sensitive ceramic material.
Example 4
a. According to LaAl 1-x Nb x O 3 The stoichiometric ratio of (x=0.1) is that 73.315 percent of lanthanum trioxide, 20.7 percent of aluminum trioxide and 5.985 percent of niobium pentoxide are respectively weighed and mixed according to the weight percentage, and the mixture is put into an agate mortar for grinding for 10 hours to obtain powder;
b. calcining the powder ground in the step a at 1320 ℃ for 10 hours, and grinding for 7.5 hours to obtain LaAl 1-x Nb x O 3 (x=0.1) powder;
c. the powder material obtained in the step b is mixed with 10Kg/cm 2 The block material is pressed into blocks for 1min, the formed block material is subjected to cold isostatic pressing, the pressure is maintained for 5min under 350MPa, and then the block material is sintered for 20 h at the temperature of 1525 ℃ to obtain the high-temperature heat-sensitive ceramic material;
d. coating the front and back sides of the ceramic material sintered in the step c with platinum slurry electrodes, and then annealing for 30 minutes at 900 ℃ to obtain the ceramic material with negative temperature coefficient characteristics in the temperature range of 600 ℃ to 1400 ℃, wherein the resistivity of the ceramic material at 1000 ℃ is 145626.2 Ω & cm, and the resistivity drift rate delta R/R after aging for 600 hours at high temperature 1000 DEG C 0 (%) is 0.906% of high-temperature zone negative temperature coefficient heat-sensitive ceramic material.
Comparative example 5
a. According to LaAlO 3 According to the stoichiometric ratio of (1), respectively weighing 15.222 parts of lanthanum oxide and 4.778 parts of aluminum oxide, mixing, and grinding the mixed raw materials in an agate mortar for 8 hours to obtain powder;
b. calcining the powder ground in the step a at 1300 ℃ for 10 hours, and grinding for 6 hours to obtain LaAlO 3 Powder;
c. the powder material obtained in the step b is processed by 15Kg/cm 2 The block material is pressed into blocks for 2min, the formed block material is subjected to cold isostatic pressing, the pressure is maintained for 4min under 300MPa, and then the block material is sintered for 20 h at 1600 ℃ to obtain the high-temperature heat-sensitive ceramic material;
d. coating platinum slurry electrodes on the front and back sides of the heat-sensitive ceramic material sintered in the step c, and then annealing at 900 DEG C30 minutes to obtain the material with negative temperature coefficient characteristics in the temperature range of 600-1400 ℃, the resistivity of the material at 1000 ℃ is 68971.9 omega cm, and the resistivity drift rate delta R/R after aging for 500 hours at high temperature 1000 DEG C 0 The percentage of the perovskite type high-temperature heat sensitive ceramic resistance material is 1.294 percent.
The experimental results are as follows:
comparing any of the novel high temperature zone negative temperature coefficient thermal ceramic materials obtained in examples 1-4 with the comparative example, see fig. 1, the results show that: with the increase of the niobium pentoxide content, the diffraction peaks of all samples can be well matched with LaAlO 3 No second phase is generated, indicating that the niobium element is successfully doped into LaAlO 3 And (3) phase (C).
FIG. 2 shows a sample LaAl obtained by doping niobium 1-x Nb x O 3 Is a graph showing LaAl after sintering 1-x Nb x O 3 Aging resistivity drift rate (DeltaR/R) of ceramic 0 ) From the graph of aging time t, it can be seen that LaAl is present when the doping level of niobium is between 0.025 and 0.075 1-x Nb x O 3 The aging resistance drift rate (delta R/R) of the material after aging at 1000 ℃ for 400-600 hours 0 ) Between 1.531-3.352%, undoped LaAlO 3 The aging resistance drift rate (delta R/R) of the material after aging at 1000 ℃ for 500 hours 0 ) 1.976%, whereas LaAl was used when the doping amount of niobium was 0.1 1-x Nb x O 3 The aging resistance drift rate (delta R/R) of the material after aging at 1000 ℃ for 500 hours 0 ) As low as 0.906 percent, effectively improves LaAlO 3 The aging stability of the material in a high temperature area can effectively prolong LaAlO 3 The service life of the material in a high-temperature environment ensures that LaAl 1-x Nb x O 3 The material becomes a novel negative temperature coefficient thermal sensitive ceramic material which can be applied to the temperature measurement of a high temperature area, and is hopeful to be applied to the temperature measurement of aviation, deep sea and other special high temperature environments.
The novel high-temperature-zone negative temperature coefficient thermal sensitive ceramic material LaAl 1-x Nb x O 3 Is prepared by a solid phase reaction method.The following raw materials are strictly weighed according to the weight percentage: 73.315-76.112% of lanthanum oxide, 20.701-23.888% of aluminum oxide and 1.540-5.985% of niobium pentoxide; the preparation method comprises the following steps: s1, weighing; s2, mixing; s3, grinding; s4, presintering; s5, secondary grinding; s6, tabletting and forming; s7, isostatic pressing; s8, sintering; s9, coating platinum slurry; s10, annealing; s11, welding the lead. The NTC thermistor has a wider temperature range (600-1400 ℃) and excellent aging stability, and is aged for 400-600 hours at a high temperature of 1000 ℃ and then LaAl is used 1-x Nb x O 3 The resistivity drift rate of the sample is 0.906-3.352%, and the sample has the advantages of long service life and the like; in addition, the powder particles prepared by the method have high dispersity, are not suitable for agglomeration and have high material strength.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the appended claims.
Claims (8)
1. A negative temperature coefficient thermal sensitive ceramic material in a high temperature area is characterized in that: the chemical composition of the thermosensitive ceramic material is LaAl 1-x Nb x O 3 Wherein x=0.025-0.10.
2. The high temperature zone negative temperature coefficient thermal sensitive ceramic material of claim 1, wherein: the thermosensitive ceramic material is mainly prepared from the following raw materials in percentage by weight: 73.315-76.112% of lanthanum trioxide, 20.701-23.888% of aluminum oxide and 1.540-5.985% of niobium pentoxide.
3. The high temperature zone negative temperature coefficient thermal sensitive ceramic material of claim 1, wherein: the obtained heat sensitive ceramic material has resistivity of 68971.9-151582.3 ohm cm at 1000 ℃, and resistance drift after aging for 400-600 hours at high temperature 1000 DEG CRate of shift ΔR/R 0 (%) is 0.906-3.352%.
4. The preparation method of the negative temperature coefficient heat-sensitive ceramic material in the high temperature area comprises the following steps:
a. respectively weighing raw materials of lanthanum oxide, aluminum oxide and niobium pentoxide, mixing, and grinding the mixture to obtain powder;
b. calcining the powder obtained in the step a, and grinding to obtain LaAl 1-x Nb x O 3 The powder is prepared from the following components, wherein,
x＝0.025-0.10；
c. b, obtaining LaAl in the step b 1-x Nb x O 3 Briquetting and forming the powder material, carrying out cold isostatic pressing on the formed block material, and then sintering to obtain the high-temperature heat-sensitive ceramic material;
d. and c, coating electrodes on the front and back sides of the high-temperature ceramic material sintered in the step c, and then annealing to obtain the negative temperature coefficient thermal sensitive ceramic material in the high-temperature region.
5. The method for preparing the negative temperature coefficient thermal sensitive ceramic material in the high temperature area according to claim 4, wherein the method comprises the following steps: in the step a, 73.315 to 76.112 weight percent of lanthanum oxide, 20.701 to 23.888 weight percent of aluminum oxide and 1.540 to 5.985 weight percent of niobium pentoxide are respectively weighed and mixed, and the mixture is put into a mortar for grinding for 6 to 10 hours.
6. The method for preparing the negative temperature coefficient thermal sensitive ceramic material in the high temperature area according to claim 4, wherein the method comprises the following steps: in the step b, the calcination temperature is 1205-1350 ℃, the calcination time is 8-12 hours, and the grinding is 6-8 hours.
7. The method for preparing the negative temperature coefficient thermal sensitive ceramic material in the high temperature area according to claim 4, wherein the method comprises the following steps: in the step c, the pressure of the briquetting forming is 10-20Kg/cm 2 The time is 1-2min, the formed block material is subjected to cold isostatic pressing, and the pressure is maintained for 3-5min under the pressure of 250-350 MPa; the sintering temperature is 1500-1550 ℃,the sintering time is 15-25 hours.
8. The method for preparing the negative temperature coefficient thermal sensitive ceramic material in the high temperature area according to claim 4, wherein the method comprises the following steps: in the step d, the front and back sides of the high-temperature ceramic material are coated with platinum slurry electrodes; the annealing temperature is 900-950 ℃ and the annealing time is 30-45min.
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