Preparation method and application of zirconium dioxide porous ceramic material

A technology of porous ceramics and zirconia, which is applied in the field of preparation of zirconia porous ceramics, can solve the problems of difficulty in preparing high-porosity materials, difficulty in reducing gas heat conduction, and large pore diameter of pores, etc., and achieves high strength and low thermal conductivity. The effect of small rate and aperture

Active Publication Date: 2020-07-03
南京理工宇龙新材料科技股份有限公司
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  • Description
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Problems solved by technology

The main disadvantages of these preparation methods are that it is difficult to prepare high-porosity materials; the second is that the prepared pores have large pore diameters (about tens to hundreds of μm) and uneven distribution, and it is difficult to reduce the heat conduction of gases in pores at high temperatures. (The mean free path of air is 70nm)
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Method used

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  • Preparation method and application of zirconium dioxide porous ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Among the raw materials used in the examples, the particle size of the 8YSZ powder is 40-50 nm, and the crystal phase is a fully stable cubic phase. Adopt the ZrO of smaller particle size in the embodiment 2 ZrO with smaller pore size can be obtained 2 Porous ceramics, and will not be affected by ZrO at high temperature 2 The phase change produces a volume change, leading to cracking. Gas phase SiO as additive 2 The particle size of ZrO is 7-40nm, and the particle size of agglomerated particles is 200-400nm; ZrO 2The particle size of the hollow sphere is 2-5μm, and the wall thickness is 200-400nm; the diameter of the 8YSZ short fiber is 5-10μm, and the length is 2-5mm.

[0029] Mix 13g of N-methylolacrylamide (N-MAM), 1.3g of N,N-methylenebisacrylamide (MBAM) and 110g of tert-butanol (TBA) to form a 11.5wt% premix, Then add 0.38g N,N,N',N'-tetramethylethylenediamine (TEMED), 50g 8YSZ nanopowder, 3g TiO 2 Powder, 0.1g of ammonium polyacrylate and 1.3g of PVP were p...

Embodiment 2

[0032] Mix 13.5g N-MAM, 1.35g MBAM, 100g TBA and 15g absolute ethanol to form a premix with a mass fraction of 11.4wt%, then add 0.38g TEMED, 60g 8YSZ nanopowder, 3.3g SiC powder, 0.2g sodium hexametaphosphate and 1.35g PVP were ball milled for 1 hour, then 6g of 8YSZ fiber was added, stirred for 5 minutes, and then ultrasonically vibrated for 5 minutes to obtain a stable ceramic suspension slurry. Follow-up steps are carried out according to embodiment 1, obtain ZrO 2 porous ceramics.

[0033] The resulting ZrO 2 The density of porous ceramics is 0.84g / cm 3 , the porosity measured by the Archimedes drainage method is about 86%, the compressive strength is 4.36MPa, and the thermal conductivity at room temperature is 0.075W / (m·K).

Embodiment 3

[0035] According to Example 1, 13.5g of N-MAM, 1.35g of MBAM, 100g of TBA and 15g of isopropanol were uniformly mixed to form a premix solution with a mass fraction of 11.4wt%. Then add 0.38g TEMED, 60g 8YSZ nanopowder, 0.2g sodium hexametaphosphate and 1.3g PVP to the premixed liquid, after ball milling for 1h, add 4g ZrO 2 Hollow spheres, 6g 8YSZ fibers, stirred for 5 minutes and then ultrasonically vibrated for 15 minutes to obtain a stable ceramic slurry suspension. Follow-up steps are carried out according to embodiment 1, obtain ZrO 2 Ceramic foam.

[0036] The resulting ZrO 2 The density of porous ceramics is 0.67g / cm 3 , the porosity measured by the Archimedes drainage method is 88.8%, the compressive strength is 3.02MPa, and the thermal conductivity at room temperature is 0.043W / (m·K).

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Abstract

The invention provides a preparation method and application of a zirconium dioxide porous ceramic material. The technological process comprises the steps of 8YSZ ceramic slurry suspension preparation,alcohol-based gel injection molding, freeze drying, degreasing and high-temperature heat treatment. Due to small surface tension of tert-butyl alcohol, isopropanol and the like, shrinkage of a samplein the drying process can be inhibited by combining an alcohol-based gel casting technology and a freeze drying technology, so that the high-porosity porous ceramic is prepared. The density of the prepared ZrO2 porous ceramic is 0.67-1.02 g / cm<3>, the porosity is 83-89%, the compressive strength is 3-6 MPa, and the room-temperature thermal conductivity is 0.04-0.1 W / (m.K).

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a preparation method of zirconia porous ceramics and a prepared product. Background technique [0002] Aerospace vehicles and engineering structural materials (such as turbine blades, jet engines, etc.) require special materials for protection in harsh environments. These protective layer materials not only protect the protected materials from corrosion, wear and erosion, but also play a role of heat insulation. Especially when these protective layer materials are used as heat-resistant structures, they are subjected to extreme high temperature, high pressure and thermal cycle environments. At present, the main materials used in the protective layer are: Al 2 o 3 、TiO 2 、CaO / MgO+ZrO 2 , Yttria Stabilized Zirconia (YSZ), CeO 2 +YSZ, ZrO 2 , La 2 Zr 2 o 7 , mullite, etc. Among them, 8YSZ ceramic materials are widely used because of their advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/80C04B35/622C04B35/634C04B38/00
CPCC04B35/488C04B35/622C04B35/63444C04B38/0605C04B2235/3225C04B2235/3232C04B2235/3246C04B2235/3418C04B2235/3826C04B2235/5236C04B2235/526C04B2235/5264C04B2235/528C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/6023C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B35/803C04B38/0067C04B38/0074
Inventor 戴生伢张引陈福金黄振进
Owner 南京理工宇龙新材料科技股份有限公司
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