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Preparation of zircite porous ceramic

A technology of porous ceramics and zirconia, which is applied in the field of preparation of porous ceramics, can solve problems such as poor uniformity, irregular distribution of material pores, and difficult control of the preparation process, and achieve the effects of regular distribution, adjustable size, and small thermal stress

Inactive Publication Date: 2008-11-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of zirconia porous ceramics in order to solve the problems that the existing preparation process of zirconia porous ceramics is difficult to control, and the distribution of pores of the obtained material is irregular and the uniformity is poor.

Method used

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  • Preparation of zircite porous ceramic

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specific Embodiment approach 1

[0008] Embodiment 1: The preparation method of zirconia porous ceramics in this embodiment is realized by the following steps: 1. Partially stabilized ZrO by volume percentage of 10-35% 2 Powder with 65-90% C 10 h 16 Mix, then add polystyrene, put it into a ball mill jar, put it in a water bath at 60-70°C for 18-22 hours, and get a slurry; 2. Put the mold in liquid nitrogen for pre-cooling, and then pour Put in the slurry, and after the slurry is solidified, place it in the environment of -33~-37℃ and freeze it for 22~26 hours; 3. After the frozen slurry is released from the mold, place it in the room temperature air environment to dry for 46~50 hours, and then put it in the sintering In the furnace, heat up to 1450-1650°C at a heating rate of 2-4°C / min, heat-preserve and sinter for 2-4 hours, and then cool to room temperature at a cooling rate of 5-10°C / min to obtain porous zirconia ceramics; the steps The addition of polystyrene in the first step is 2~3% of the total weigh...

specific Embodiment approach 2

[0009] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, 20% of the partially stabilized ZrO 2 Powder with 80% C 10 h 16 After mixing, polystyrene was added, and then put into a ball mill jar, and placed in a water bath at 65°C for ball milling and wet mixing for 20 hours. Other steps and parameters are the same as those in Embodiment 1.

[0010] In this embodiment C 10 h 16 The mass purity of the product is >97%; ball milling wet mixing is carried out by using zirconia balls with a diameter of 5mm and mixing at a speed of 150-250r / min.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one is the partially stable ZrO in step one 2 The powder contains Y with a molar percentage of 5mol%. 2 o 3 . Other steps and parameters are the same as those in Embodiment 1.

[0012] This embodiment ZrO 2 Y in powder 2 o 3 as a stabilizer.

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Abstract

The invention provides a method for producing the zirconia porous ceramics, which solves the problems of the production technique of the existing zirconia porous ceramics is hard to control, the distribution of the porous in the obtained material is irregular with poor uniformity. The method comprises the following steps of: (1) wetly mixing the ZrO2C10H16 and polystyrene to obtain paste; (2) pre-cooling the paste and then freezing the paste; (3) demoulding and drying the frozen paste, then carrying out heat-insulating and sintering and re-cooling to the room temperature to obtain the zirconia porous ceramics. The production technique of the invention is easy to control and the distribution of the porous in the obtained material is regular with good uniformity.

Description

technical field [0001] The invention relates to a preparation method of porous ceramics. Background technique [0002] Zirconia porous ceramics have the following excellent properties: high strength at room temperature and changing temperature, good thermal shock resistance, high temperature resistance, chemical corrosion resistance, high permeability, large specific surface area, low density, low thermal conductivity and high porosity It has been gradually applied in metallurgy, electronics, environmental protection, energy, biology, chemical industry, aerospace and other fields. [0003] The key and difficulty in the preparation of zirconia porous ceramics is to form a porous structure. According to the purpose of use and the requirements for material properties, the existing preparation technologies mainly include: adding pore-forming agent method, particle accumulation molding method, foaming method, organic foam impregnation method, sol-gel method or combustion synthes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B38/00
Inventor 洪长青韩杰才张幸红孟松鹤张如炳
Owner HARBIN INST OF TECH
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