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Zirconium oxide-based porous composite material and preparation method thereof

A porous composite material and composite material technology are applied in the field of zirconia-based porous composite materials and their preparation, which can solve problems such as difficulty in preparing porous ceramics and achieve the effect of wide applicability

Inactive Publication Date: 2014-12-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The current methods for preparing porous ceramics include the template method [H.W.Kim, S.Y.Lee, C.J.Bae, Y.J.Noh, H.E.Kim, H.M.Kim, J.S.Ko, Porous ZrO2bone scaffold coated with hydroxyapatite with fluoropatite intermediate layer, Biomaterials, 2003, 24:3277-3284 ; I.K.Jun, Y.H.Koh, H.E.Kim, Fabrication of ultrahigh porosity ceramics with biaxial pore channels, Mater.Lett., 2006,60:878-882], adding pore forming agent method [M.Boaro, J.M.Vohs, R.J.Gorte, Synthesis of highly porous yttria-stabilized zirconia by tape-casting methods, J.Am.Ceram.Soc., 2003,86(3):395-400], partial sintering method [Z.Y.Deng, J.F.Yang, Y.Beppu, M .Ando,T.Ohji,Effect of agglomeration on mechanical properties of porous zirconia fabricated by partial sintering,J.Am.Ceram.Soc.,2002,85:1961-1965], organic foam impregnation method [S.Y.Gomez,J.A.Escobar, O.A.Alvarez, C.R.Rambo, A.P.N.de Oliveira, D.Hotza, ZrO2foams for porous radiant burners, Journal of Materials Science, 2009, 44:3466-3471], etc., but these methods are difficult to prepare both high porosity and high mechanical strength porous ceramics

Method used

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  • Zirconium oxide-based porous composite material and preparation method thereof
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  • Zirconium oxide-based porous composite material and preparation method thereof

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preparation example Construction

[0035] The invention relates to a method for preparing a zirconia-based heat-insulating, high-temperature-resistant and anti-oxidation porous composite material (using zirconia felt as a reinforcement fiber), which uses the original inorganic salt zirconium oxychloride (ZrOCl 2 ·8H 2 O) is the zirconia precursor. The zirconia precursor impregnation liquid is introduced into the reinforcement fiber (zirconia felt) skeleton by vacuum pressure impregnation process, impregnated, dried, and cracked twelve times in a cycle. Obtained by pressing and sintering (using zirconia felt as reinforcement fiber) zirconia-based porous composite material, the bulk density can be 2.93-3.32g / cm 3 , the open porosity is 41.1-49.8%, the compressive strength is 14.6-47.4MPa, and the thermal conductivity of the zirconia porous composite material is 0.58-0.91W / ( m·K). The invention creates a lightweight, heat-insulating, and high-temperature-resistant porous material and a preparation method thereof...

Embodiment 1

[0066] Dissolve 180g of zirconium oxychloride in 150ml of water and stir to dissolve it. Add 11.54g of yttrium nitrate hexahydrate and 7.85g of lanthanum nitrate hexahydrate and mix well, and add 1.13g of polyethylene glycol as a dispersant, and then add 285ml of dilute ammonia water (concentration: 2mol / L) dropwise. After the ammonia water was added dropwise, the solution was heated to evaporate part of the solvent to reduce the total volume of the mixed solution to 130ml, and cooled to room temperature to obtain a zirconia precursor emulsion. Then the zirconia precursor emulsion, ethanol and 5wt% concentration polyvinyl alcohol (PVA) solution were uniformly mixed according to the volume ratio of 100:80:1, and the room temperature viscosity of the slurry was controlled to 20-60mPa·s and the viscosity was measured with a rotational viscometer. Put the zirconia felt in the vacuum impregnation tank. When the impregnation tank is evacuated below 100Pa, suck the impregnation solut...

Embodiment 2

[0072] Other processes are the same as in Example 1, but sintered at 1500°C and kept for 2 hours, the bulk density of the zirconia felt / zirconia porous composite material obtained in this example is 3.18g / cm 3 , the open porosity is 44.1%, the thermal conductivity is 0.66-0.91W / (m·K) in the temperature range of 100-1200°C, the compressive strength is 19.8MPa, and the zirconia felt accounts for about 30wt% of the zirconia-based porous composite material.

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Abstract

The invention relates to a zirconium oxide-based porous composite material and a preparation method thereof. The zirconium oxide-based porous composite material comprises a zirconium oxide base body consisting of La2O3, Y2O3 and ZrO2 and reinforcement fibers buried in the zirconium oxide base body, wherein the zirconium oxide base body comprises 1-10mol% of La2O3, 0.5-5mol% of Y2O3 and the balance of ZrO2, totaling 100mol% of the sum of the molar ratios of La2O3, Y2O3 and ZrO3. The reinforcement fibers account for 10-45wt% of the zirconium oxide-based porous composite material.

Description

technical field [0001] The invention belongs to the field of high-temperature thermal protection materials, and in particular relates to a zirconia-based porous composite material and a preparation method thereof. Background technique [0002] Aerospace vehicles or cruise missiles are subjected to complex environments such as severe heat, vibration, noise, and shock during flight. The most severe flight condition is the intense aerodynamic heating when re-entering the atmosphere from orbit at hypersonic speed. When the aircraft flies at a speed of Mach 8 at an altitude of 27km, the temperature at the nose cone is 1793°C, and the temperature at the leading edge of the wing or tail is as high as 1455°C [NASA Facts, National Aeronautics and Space Administration, John F. Kennedy Space Center, Orbiter Thermal Protection System, FS-2000-06-29-KSC, 1997.]. As the flight speed of aerospace and aviation vehicles continues to increase, the service environment is getting worse and wor...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/48C04B35/80
Inventor 艾建平王士维周国红张海龙覃显鹏刘娟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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