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Method for producing high-strength shock resistant heat insulating porous ceramic

A porous ceramic, high-strength technology, used in ceramic products, applications, household appliances, etc., can solve the problem of porous mullite not receiving enough attention, reduce the room temperature strength of mullite ceramics, etc., to reduce defects and relieve thermal stress. , the effect of reducing thermal conductivity

Inactive Publication Date: 2008-05-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of pores in porous mullite ceramics will further reduce the room temperature strength of mullite ceramics, so the research on porous mullite has not received enough attention so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step: ball mill commercial high-purity mullite (purity greater than 98.4%) with a high-energy mill (superflow) to obtain mullite powder with a particle size of less than 1 μm;

[0026] The second step: According to the molar ratio of yttrium oxide and zirconia as 3:97, add zirconium oxychloride and yttrium chloride to distilled water to form a 50g / l solution, stir for 2 hours, slowly add ammonia water, and adjust the pH value to 9 to 10, a mixed sol of zirconium hydroxide and yttrium hydroxide is formed, washed with water and dehydrated with absolute ethanol, then added to mullite powder with a particle size of 0.78 μm, added triethanolamine as a dispersant, mixed uniformly by ball milling, and then dried; oxidation Zirconium accounts for 15vol% of the zirconia / mullite powder; the addition of triethanolamine is 0.5wt% of the zirconia / mullite powder;

[0027] The third step: the mixed powder prepared in the second step is heated up to 700°C at 5°C / min, and then...

Embodiment 2

[0034] Repeat the first step, the second step operation of embodiment 1;

[0035] The third step: the mixed powder prepared in the second step is heated up to 900°C at 5°C / min, and then kept at 900°C for two hours for calcination;

[0036] Repeat the 4th step, the 5th step operation of embodiment 1;

[0037] Step 6: Burn the pore-forming agent (starch) in the sample according to the sixth step of Example 1, and then rapidly heat up to 1500° C. to burn the sample;

[0038] Repeat the seventh step operation of embodiment 1;

[0039] This example contains 15vol% ZrO 2 and 25wt% starch, the relative density of the porous ceramic sample prepared by the above method after firing at 1500°C is 80.1%, the strength is 231MPa, and the thermal shock critical temperature is 250°C, which has good heat insulation effect and thermal shock resistance sex.

Embodiment 3

[0041] Repeat the first step operation of embodiment 1;

[0042]The second step: According to the molar ratio of yttrium oxide and zirconia as 3:97, add zirconium oxychloride and yttrium chloride to distilled water to form a 70g / l solution, stir for 2 hours, slowly add ammonia water, and adjust the pH value to 9 to 10, a mixed sol of zirconium hydroxide and yttrium hydroxide is formed, washed with water and dehydrated with absolute ethanol, then added to mullite powder with a particle size of 0.78 μm, added triethanolamine as a dispersant, mixed uniformly by ball milling, and then dried; oxidation Zirconium accounts for 10vol% of the zirconia / mullite powder; the addition of triethanolamine is 0.5wt% of the zirconia / mullite powder;

[0043] The third step: the mixed powder prepared in the second step is heated up to 500°C at 5°C / min, and then kept at 500°C for two hours for calcination;

[0044] Repeat the 4th step, the 5th step, the 6th step operation of embodiment 2;

[004...

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Abstract

The invention discloses a producing method of vibration resisting and heat isolating multi-hole ceramic with high intensity. The method comprises the steps as follows: grinding the porzite ball with purity bigger than 98.4 percent to the porzite powder with granularity smaller than 1 micrometers, adding mixed sol of zirconium hydroxide and yttrium hydroxide produced by adopting the commonly depositing method into the porzite powder, adding trolamine as the dispesant, mixing evenly, drying, calcining in a temperature range of 500 to 900 DEG C and then acquiring the evenly distributed zirconia / porzite powder body of the zirconia; then adding amylum into the ethanol without water, using ultrasonic to disperse and adds the amylum into the zirconia / porzite powder body. After the grain is produced, the invention adopts the dry pressing firstly and then the static press moulding , eliminates amylum when the indoor temperature is ascended to 700 DEG C, then quickly ascends temperature to 1500 to 1600 DEG C so as to burn to the vibration resisting and heat isolating porous ceramics with high intensity. The porous ceramics produced by the invention has high intensity, small aperture of the air hole, much centralized distribution, good thermal shock resisting capacity and heat isolating capacity.

Description

technical field [0001] The invention relates to the field of high-performance structural ceramic materials and porous materials, in particular to a method for preparing high-strength shock-resistant and heat-insulating porous zirconia toughened mullite ceramics. Background technique [0002] Mullite ceramics has good chemical stability, thermal shock resistance, creep resistance, and in the entire crystallization temperature range, there is no polycrystalline transformation that leads to volume change, etc. It is an excellent ceramic and has been widely used. At present, mullite is widely used in heat-resistant materials such as crucibles, protective tubes and thermocouple tubes. As an excellent refractory material, mullite bricks are widely used in metallurgy and ceramic industries. In the field of aerospace, mullite ceramics can also be used as thermal protection materials for the leading edge of aircraft and spacecraft, as well as exhaust pipe covers and shields for rock...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/185
Inventor 饶平根赵光岩吴建青吕明
Owner SOUTH CHINA UNIV OF TECH
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