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Preparation method of tough alumina ceramic membrane

A technology of alumina ceramic membrane and toughness, which is applied in the field of preparation of tough alumina ceramic membrane, can solve the problems of low membrane toughness, small processing area and complicated process of alumina ceramic membrane, and achieves high toughness, uniform structure, Simple preparation process

Inactive Publication Date: 2013-04-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention aims to solve the problems of low film toughness, strain value lower than 1%, small processing area and complex process of the alumina ceramic film prepared by the existing method, and provides a preparation method of the tough alumina ceramic film

Method used

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  • Preparation method of tough alumina ceramic membrane
  • Preparation method of tough alumina ceramic membrane
  • Preparation method of tough alumina ceramic membrane

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specific Embodiment approach 1

[0011] Specific embodiment one: the preparation method of a kind of ductile aluminum oxide ceramic film of this embodiment is to carry out through the following steps: 1, prepare weakly alkaline electrolyte, weakly alkaline electrolyte is made up of alkaline regulator and spark regulator 2. Aluminum alloy is placed in the tank body filled with the weakly alkaline electrolyte prepared by step 1, wherein the anode is aluminum alloy, and the negative electrode is stainless steel or graphite material, then the power supply is oxidized with liquid phase plasma, at current density Oxidation for 1-12 minutes under the condition of 0.02-0.14A / cm2; 3. Rinse and dry the aluminum alloy treated in step 3 to obtain a tough alumina ceramic film; wherein the spark control agent in step 1 is rare earth Salt; the final concentration of the alkaline regulator in the weak alkaline electrolyte is 1-30g / L, and the final concentration of the spark regulator is 1-20g / L.

[0012] In this embodiment, ...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the alkaline regulator in step 1 is a mixture of one or more of metaaluminate, sodium hydroxide or phosphate in any ratio . Other steps and parameters are the same as in the specific embodiment.

specific Embodiment approach 3

[0014] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that the rare earth salt is cerium nitrate, lanthanum nitrate, ytterbium nitrate or yttrium nitrate. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a preparation method of a tough alumina ceramic membrane, and solves the problems that the alumina ceramic membrane prepared according to the conventional method is low in toughness, small in processing area and complex in process and has a strain value of lower than 1%. The preparation method comprises the following steps: 1, preparing weak alkaline electrolyte with alkalinity regulator and spark control agent; 2, putting aluminium alloy into a tank body with electrolyte, wherein an anode is made of aluminium alloy, and an anticathode is made of stainless steel or graphite; 3, oxidizing the aluminium alloy for 1-12 minutes with a liquid phase plasma oxidizing power supply under the condition that the current density of 0.02-0.14A / cm<2>; and 4, rinsing and drying the aluminium alloy processed in the step 3 to obtain the tough alumina ceramic membrane. The preparation method of the tough alumina ceramic membrane is applied to the field of chemical industry.

Description

technical field [0001] The invention relates to a preparation method of a tough aluminum oxide ceramic membrane. Background technique [0002] Alumina ceramics have the characteristics of high temperature resistance, wear resistance, electrical insulation, oxidation resistance, corrosion resistance, and high mechanical strength. With their excellent physical and chemical properties and structural stability, they are widely used in many fields such as national defense, construction, chemical industry, and smelting. Application requirements. However, the alumina ceramic material is a kind of material combined with covalent bonds and ionic bonds at the microscopic level. Because of the directionality of the bonded valence bonds, the material has the disadvantages of high brittleness and low toughness, and fracture occurs at extremely low strain values. , which greatly limits the wide application of ceramic materials. Especially with the rapid development of the aerospace indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
Inventor 王志江姜兆华聂学渊
Owner HARBIN INST OF TECH
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