Method for preparing ultra-high-temperature thermal-insulation Yb3Al5O12ceramic component

A technology of yb3al5o12, ceramic components, applied in the field of ultra-high temperature heat-insulating ceramics, achieving the effects of high purity, low thermal conductivity, and optimized preparation process

Active Publication Date: 2015-12-09
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve complex shape high temperature heat insulation, high temperature heat sealing Yb 3 Al 5 o 12 The molding problem of elastic components, while overcoming the toxicity of the acrylamide system and the complex components and procedures that need to add various additives such as crosslinking agent, catalyst, dispersant, initiator, reducing agent, pH value regulator, etc. during the slurry preparation process, The invention provides a kind of ultra-high temperature thermal insulation Yb with complex shape which only uses a single water-soluble non-toxic additive isobutylene-maleic anhydride copolymer to realize gel injection molding at room temperature and air 3 Al 5 o 12 ceramic method

Method used

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  • Method for preparing ultra-high-temperature thermal-insulation Yb3Al5O12ceramic component
  • Method for preparing ultra-high-temperature thermal-insulation Yb3Al5O12ceramic component
  • Method for preparing ultra-high-temperature thermal-insulation Yb3Al5O12ceramic component

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of preparation ultra-high temperature insulation Yb described in the present invention 3 Al 5 o 12 A method for a ceramic element, comprising the steps of:

[0031] (1) Change Yb 2 o 3 and Al 2 o 3 Powder according to Yb 2 o 3 :Al 2 o 3 =3.01:5 molar ratio weighing, adding absolute ethanol, mixing with a drum mixer for 48 hours, the rotating speed is 80 / rev, and the uniformly mixed raw materials are dried at 20°C for 24 hours to obtain Yb 2 o 3 and Al 2 o 3 Mix the powder, dry the Yb after treatment 2 o 3 and Al 2 o 3 The mixed powder is placed in a molybdenum disilicide furnace, heated to 1050°C in the air, and kept for 4 hours to obtain the main phase as Yb 3 Al 5 o 12 Ultra-high temperature insulation ceramic powder.

[0032] (2) take dehydrated alcohol as medium with the Yb of step (1) gained with planetary ball mill ball mill 3 Al 5 o 12 The ceramic powder was ball milled for 36 hours at a speed of 200 rpm to obtain Yb with a particle ...

Embodiment 2

[0037] A kind of preparation ultra-high temperature insulation Yb described in the present invention 3 Al 5 o 12 A method for a ceramic element, comprising the steps of:

[0038] (1) Change Yb 2 o 3 and Al 2 o 3 Powder according to Yb 2 o 3 :Al 2 o 3 =3.02:5 molar ratio weighing, adding absolute ethanol, mixing with a drum mixer for 36 hours, the rotating speed is 100 / rev, and drying the uniformly mixed raw materials at 35°C for 12 hours to obtain Yb 2 o3 and Al 2 o 3 Mix the powder, dry the Yb after treatment 2 o 3 and Al 2 o 3 The mixed powder is placed in a molybdenum disilicide furnace, heated to 1250°C in the air, and kept for 2 hours to obtain high-purity Yb 3 Al 5 o 12 Ultra-high temperature insulation ceramic powder.

[0039] (2) take absolute ethanol as the medium and use planetary ball mill ball mill to Yb 3 Al 5 o 12 The ceramic powder was ball milled for 24 hours at a speed of 300 rpm to obtain Yb with a particle size of less than 1 μm 3 Al ...

Embodiment 3

[0042] A kind of preparation ultra-high temperature insulation Yb described in the present invention 3 Al 5 o 12 A method for a ceramic element, comprising the steps of:

[0043] (1) Change Yb 2 o 3 and Al 2 o 3 Powder according to Yb 2 o 3 :Al 2 o 3 =3.03:5 molar ratio weighing, adding absolute ethanol, mixing with a drum mixer for 30 hours, the rotating speed is 150 / rev, and drying the uniformly mixed raw materials at 40°C for 12 hours to obtain Yb 2 o 3 and Al 2 o 3 Mix the powder, dry the Yb after treatment 2 o 3 and Al 2 o 3 The mixed powder is placed in a molybdenum disilicide furnace, heated to 1350°C in the air, and kept for 1 hour to obtain high-purity Yb 3 Al 5 o 12 Ultra-high temperature insulation ceramic powder.

[0044] (2) take absolute ethanol as the medium and use planetary ball mill ball mill to Yb 3 Al 5 o 12 The ceramic powder was ball milled for 30 hours at a speed of 280 rpm to obtain Yb with a particle size of less than 1 μm 3 Al ...

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Abstract

The present invention provides a method for preparing an ultra-high-temperature thermal-insulation Yb3Al5O12ceramic component. The method comprises: (1) carrying out a high temperature solid phase reaction on raw materials such as Yb2O3 powder and Al2O3 powder to obtain Yb3Al5O12 ceramic powder; (2) mixing the Yb3Al5O12 ceramic powder, water and an isobutylene-maleic anhydride copolymer to form a stable Yb3Al5O12 ceramic water-based slurry, and carrying out room temperature curing cross-linking to obtain a Yb3Al5O12 ceramic green; and (3) finally sintering for 1-4 h at a temperature of 1450-1680 DEG C so as to obtain the compact and complex-shape ultra-high-temperature thermal-insulation Yb3Al5O12ceramic component, wherein the sintering atmosphere is Ar gas or air. According to the present invention, the preparation method has characteristics of simple process, no requirement of high pressure equipment, easy achieving, and strong practicality.

Description

technical field [0001] The invention belongs to the technical field of ultra-high temperature heat-insulating ceramics, and specifically relates to a method of preparing ultra-high-temperature heat-insulating Yb by gel injection molding with a single water-soluble non-toxic additive 3 Al 5 o 12 method for ceramic components. Background technique [0002] Yb 3 Al 5 o 12 Ultra-high temperature insulation ceramics have a high melting point (2000°C), moderate density (theoretical density 6.67g / cm 3 , which is similar to yttria partially stabilized zirconia (YSZ) (6.46g / cm 3 ), low thermal conductivity (theoretical minimum thermal conductivity is 1.22W / m.K, lower than the theoretical minimum thermal conductivity of YSZ is 1.49W / m.K), lower elastic modulus (282GPa) and shear modulus (114GPa) , thermal expansion coefficient close to YSZ (8.22×10 -6 / K), good high-temperature water vapor corrosion resistance and other excellent comprehensive properties, become high-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44
Inventor 周延春王晓飞孙新向会敏冯志海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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