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Method for preparing porous ceramic material

A technology of porous ceramics and composite materials, applied in ceramic products, applications, household appliances, etc., can solve the problems of long preparation cycle and complicated porous ceramic process, and achieve the effect of short cycle, low cost and energy saving

Active Publication Date: 2020-06-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems of complex process and long preparation period of the traditional sintering method for preparing porous ceramics, further improve the density of the porous ceramic structure skeleton, refine the skeleton structure structure, and improve the strength of the material, the present invention proposes a method for preparing porous ceramic materials

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  • Method for preparing porous ceramic material
  • Method for preparing porous ceramic material

Examples

Experimental program
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Embodiment 1

[0027] This embodiment is a method for preparing porous oxide eutectic ceramics by using laser suspension zone melting high-gradient directional solidification technology. The specific process is:

[0028] Step one, prepare Al 2 O 3 -YAG-ZrO 2 Eutectic component oxide composite material preform: Al with a purity of 99.99% 2 O 3 , Y 2 O 3 And ZrO 2 Oxide powder as raw material, press Al 2 O 3 / Y 2 O 3 / ZrO 2 The eutectic point ratio of the phase diagram. The raw material is mixed with deionized water and polyvinyl chloride, the raw material: deionized water: polyvinyl chloride=20:20:1, and the ratio is a mass ratio to obtain a mixture. The mixture was placed in a zirconia ball milling tank, and then ball milled with a planetary mill at a speed of 550r / min for 5 hours, and then placed in a drying oven with a temperature of 80°C for 2 hours. Pass the dried powder through a 40-mesh sieve to obtain a uniform raw material powder.

[0029] The obtained uniform raw material powder is comp...

Embodiment 2

[0034] This embodiment is a method for preparing porous oxide eutectic ceramics by using laser suspension zone melting high-gradient directional solidification technology. The specific process is:

[0035] Step one, prepare Al 2 O 3 -YAG-ZrO 2 Eutectic component oxide composite material preform: Al with a purity of 99.99% 2 O 3 , Y 2 O 3 And ZrO 2 Oxide powder as raw material, press Al 2 O 3 / Y 2 O 3 / ZrO 2 The eutectic point ratio of the phase diagram. The raw material is mixed with deionized water and polyvinyl chloride, the raw material: deionized water: polyvinyl chloride=20:20:1, and the ratio is a mass ratio to obtain a mixture. The mixture was placed in a zirconia ball milling tank, and then ball milled with a planetary mill at a speed of 550r / min for 5 hours, and then placed in a drying oven with a temperature of 80°C for 2 hours. Pass the dried powder through a 40-mesh sieve to obtain a uniform raw material powder.

[0036] The obtained uniform raw material powder is comp...

Embodiment 3

[0040] This embodiment is a method for preparing porous oxide eutectic ceramics by using laser suspension zone melting high-gradient directional solidification technology. The specific process is:

[0041] Step one, prepare Al 2 O 3 -YAG eutectic composition oxide composite material preform: Al with a purity of 99.99% 2 O 3 , Y 2 O 3 Oxide powder as raw material, press Al 2 O 3 / Y 2 O 3 The eutectic point ratio of the phase diagram. The raw material is mixed with deionized water and polyvinyl chloride, the raw material: deionized water: polyvinyl chloride=20:20:1, and the ratio is a mass ratio to obtain a mixture. The mixture was placed in a zirconia ball mill tank, and then ball milled by a planetary ball mill at a speed of 550 r / min for 5 hours, and then placed in a drying oven with a temperature of 80°C for 2 hours. Pass the dried powder through a 40-mesh sieve to obtain a uniform raw material powder.

[0042] The obtained uniform raw material powder is compression molded. Dur...

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Abstract

The invention discloses a method for preparing a porous ceramic material. A high-energy laser beam is used as a heating source; zone melting is carried out on an oxide composite material prefabricatedbody with eutectic components; the surface tension of a melt and the gravity of the melt are kept balanced by accurately controlling the laser power and the drawing speed; stabilization of melt zonesis realized, meanwhile, a sample is pulled downwards to quickly cool and continuously solidify the melting zone; during solidification process, oxygen in a furnace chamber can be dissolved in the suspension melt; the solubility of the gas in the solid is far lower than that of the liquid; as the oxygen is dissolved in the melt, oxygen bubbles are separated out on a solid-liquid interface when themelt dissolved with the oxygen is solidified, the bubbles are adsorbed on the solid-liquid interface due to surface tension, the adsorbed bubbles are confined in a solid phase to form a porous structure along with directional solidification, and the porous oxide eutectic composite ceramic material with a highly-compact and uniformly-refined structural framework is obtained.

Description

Technical field [0001] The invention relates to the field of porous ceramic material preparation, in particular to a high-strength porous eutectic composite ceramic material prepared by a laser suspension zone melting high-gradient directional solidification method. Background technique [0002] Porous ceramic material has low density, good high temperature strength, high permeability, wave absorption, excellent thermal shock resistance and chemical stability, so it is used in the filtration of high temperature molten metal and gas, heat and sound insulation, biological support, catalyst Carriers, stealth and energy storage materials have shown broad application prospects in many fields. The patent "K. Schwartzwalder and AVSomers, Method of Making Porous Ceramic Articles, US Pat. No. 3090094, May 21, 1963" for the first time proposed the use of organic foam impregnation to prepare porous ceramics. This method is simple in process, low in production cost, and convenient Realize i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/10C04B35/44C04B35/48C04B35/505C04B35/634C04B35/653
CPCC04B35/10C04B35/505C04B35/48C04B35/44C04B35/63436C04B38/103C04B35/653
Inventor 苏海军赵迪郭敏张军刘林傅恒志余明辉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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