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A kind of anti-sintering zirconium pyrophosphate porous ceramic and its preparation method

A technology of porous ceramics and zirconium pyrophosphate, which is applied in the field of sintering-resistant zirconium pyrophosphate porous ceramics and its preparation, which can solve the problems of increasing thermal conductivity of porous materials, increasing the temperature and pressure of the substrate, and sintering of porous materials to achieve strength and thermal conductivity. Good rate, high porosity, small volume shrinkage

Active Publication Date: 2021-08-10
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these systems have obvious shortcomings, that is, the porous materials of these systems will undergo obvious sintering at high temperatures, resulting in a significant increase in the thermal conductivity of the porous materials at high temperatures, which will increase the temperature and pressure of the matrix. , and eventually lead to the failure of the aircraft

Method used

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  • A kind of anti-sintering zirconium pyrophosphate porous ceramic and its preparation method
  • A kind of anti-sintering zirconium pyrophosphate porous ceramic and its preparation method
  • A kind of anti-sintering zirconium pyrophosphate porous ceramic and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0026] Zirconium pyrophosphate powder and flour are used as raw materials, wherein the volume content of flour varies from 0% to 40%, and absolute ethanol is used as a medium, mixed with a planetary ball mill for 16 hours, and the uniformly mixed raw materials are vacuum-dried to obtain zirconium pyrophosphate powder and Flour mixed powder is pressed into a disc with a diameter of 15 mm and a thickness of 8 mm by dry pressing. The pressure of dry pressing is 2 MPa. The green body of dry pressing is put into a cold isostatic press for molding, and the forming pressure is 200 MPa. Put the molded sample into a high-temperature air furnace, heat it to 1300° C. at a heating rate of 15° C. / min, and keep it warm for 3 hours to obtain zirconium pyrophosphate porous ceramics. The phase compositions of porous ceramics obtained under different flour volume contents are as follows: figure 1 As shown, the results show that the obtained porous ceramics are pure zirconium pyrophosphate porou...

Embodiment 2

[0028] Zirconium pyrophosphate powder and flour are used as raw materials, wherein the volume content of flour varies from 0% to 40%, and absolute ethanol is used as a medium, mixed with a planetary ball mill for 24 hours, and the uniformly mixed raw materials are vacuum-dried to obtain zirconium pyrophosphate powder and Flour mixed powder is pressed into a disc with a diameter of 20 mm and a thickness of 10 mm by dry pressing. The pressure of dry pressing is 5 MPa. The green body of dry pressing is put into a cold isostatic press for molding, and the molding pressure is 250 MPa. Put the molded sample into a high-temperature air furnace, heat it to 1400° C. at a heating rate of 10° C. / min, and keep it warm for 1.5 hours to obtain a zirconium pyrophosphate porous ceramic with a porosity distribution of 44-60%. figure 2 Shown is the relationship between the porosity and density of zirconium pyrophosphate porous ceramics prepared at 1400°C for 1.5 hours and the volume content of ...

Embodiment 3

[0030] Use zirconium pyrophosphate powder and flour as raw materials, wherein zirconium pyrophosphate powder is 17.0g, flour is 3.0g, and the volume content of flour is 26%. With absolute ethanol as the medium, use a planetary ball mill to mix for 12 hours, and the evenly mixed raw materials are vacuum Dry to obtain the mixed powder of zirconium pyrophosphate powder and flour, and press it into a disc with a diameter of 30 mm and a thickness of 15 mm by dry pressing. The pressure of dry pressing is 4 MPa, and the dry pressed green body is put into a cold isostatic press Molding, the molding pressure is 150MPa. Put the formed sample into a high-temperature air furnace, heat it to 1350° C. at a heating rate of 20° C. / min, and keep it warm for 2.5 hours to obtain a zirconium pyrophosphate porous ceramic with a porosity of 54%. Microstructure such as image 3 As shown, wherein (a) is a microstructure photo of the pore distribution, wherein the evenly distributed large-diameter po...

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Abstract

The invention relates to a sintering-resistant zirconium pyrophosphate porous ceramic and a preparation method thereof, in particular to a low-density, low thermal conductivity, sintering-resistant zirconium pyrophosphate porous ceramic and the preparation of zirconium pyrophosphate porous ceramics by using a high-temperature template removal method and partial sintering The method belongs to the technical field of high-temperature porous heat-insulating coating materials, and the low density refers to a density not greater than 1.3g / cm 3 , low thermal conductivity not higher than 0.2W / (m·K).

Description

technical field [0001] The invention relates to a sintering-resistant zirconium pyrophosphate porous ceramic and a preparation method thereof, in particular to a low-density, low thermal conductivity, sintering-resistant zirconium pyrophosphate porous ceramic and the preparation of zirconium pyrophosphate porous ceramics by using a high-temperature template removal method and partial sintering The method belongs to the technical field of high-temperature porous heat-insulating coating materials, and the low density refers to a density not greater than 1.3g / cm 3 , low thermal conductivity not higher than 0.2W / (m·K). Background technique [0002] Silicon oxide (SiO 2 ), alumina (Al 2 o 3 ) and zirconia (ZrO 2 ) and other systems, the porous form of these systems is used in practical applications. However, these systems have obvious shortcomings, that is, the porous materials of these systems will undergo obvious sintering at high temperatures, resulting in a significant i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/447C04B38/06
CPCC04B35/447C04B38/0645C04B2235/96C04B2235/9607C04B2235/9615C04B38/0074
Inventor 向会敏赵子樊周延春彭志坚戴付志
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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