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Preparation method of zirconium oxide toughening aluminum oxide hollow balls

A technology of alumina hollow spheres and zirconia, which is applied in the field of preparation of zirconia toughened alumina hollow spheres, can solve the problems of hollow spheres that are prone to breakage, poor toughness, and limited applications, and achieve improved thermal shock resistance and use The effect of high temperature, good strength and toughness

Inactive Publication Date: 2010-08-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the alumina hollow spheres prepared by pure industrial alumina are brittle and have poor toughness, and the hollow spheres are prone to damage during the vibration forming process, which also limits the use of alumina hollow spheres as a structure-heat insulation integrated material in many rapid cooling and emergency applications. Applications in hot spots

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The proportion of raw materials is 95% of industrial alumina, 3% of zircon, and 2% of monoclinic zirconia. The above raw materials are mixed in a ball mill according to the proportion, and then placed in front of the furnace for use. After the electric arc furnace smelting preparations are completed, put it into the furnace for smelting until the raw materials are completely melted, then adjust the current to refine for 20 minutes, lift the electrode rod after the temperature reaches 2100°C, and immediately tilt the furnace to blow to form zirconia toughened alumina hollow balls. After injection, some raw materials are not balled or damaged, and can be added to the furnace for smelting next time. The particle size obtained by screening is between 0.2 and 5mm, and the bulk density of the ball is 0.78g / cm 3 , 1100 ℃ water cooling three times compressive strength retention rate is 81%, fracture toughness is 5.4MPa.m 1 / 2 .

Embodiment 2

[0014] The proportion of raw materials is 92% of industrial alumina, 3% of zircon, and 5% of monoclinic zirconia. The above raw materials are mixed in a ball mill according to the proportion, and then placed in front of the furnace for use. After the electric arc furnace smelting preparations are completed, put it into the furnace for smelting until the raw materials are completely melted, then adjust the current to refine for 20 minutes, lift the electrode rod after the temperature reaches 2400°C, and immediately tilt the furnace to blow to form zirconia toughened alumina hollow balls. Some raw materials are not balled or damaged after injection, and can be added to the furnace for smelting next time. The particle size obtained by screening is between 0.2 and 5mm, and the bulk density of the ball is 0.82g / cm 3 , 1100 ℃ water cooling three times compressive strength retention rate is 84%, fracture toughness is 4.9MPa.m 1 / 2 .

Embodiment 3

[0016] The proportion of raw materials is 95% of industrial alumina and 5% of monoclinic zirconia. The above raw materials are prepared in proportion and mixed in a ball mill before being placed in front of the furnace for use. After the electric arc furnace smelting preparations are completed, put it into the furnace for smelting until the raw materials are completely melted, then adjust the current to refine for 20 minutes, lift the electrode rod after the temperature reaches 2500°C, and immediately tilt the furnace to blow to form zirconia toughened alumina hollow balls. After blowing, some raw materials are not balled or damaged, and can be added to the furnace for smelting next time. The particle size obtained after screening is between 0.2 and 5mm, and the bulk density of the ball is 0.85g / cm 3 , 1100 ℃ water cooling three times compressive strength retention rate is 78%, fracture toughness is 4.2MPa.m 1 / 2， .

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Abstract

The invention discloses a preparation method of zirconium oxide toughening aluminum oxide hollow balls. The method uses industrial aluminum oxide as major raw materials, zirconium-containing toughening materials are introduced to be smelted in a three-phase AC electric arc furnace or a DC electric arc furnace, air is used for blasting during furnace turndown, and then, 0.2 to 5mm zirconium oxide toughening aluminum oxide hollow balls are obtained through sieving separation. Compared with aluminum oxide hollow balls produced by pure industrial aluminum oxide, the hollow balls have the advantages that the intensity and the toughness are better, the thermal shock resistance performance is greatly improved, and the hollow balls are particularly applicable to sharp quenching and sharp heating parts, have high use temperature, and can be widely applied to various light bricks and heat insulation casting materials.

Description

technical field [0001] The invention relates to a method for preparing a refractory material, in particular to a method for preparing a zirconia toughened alumina hollow sphere. Background technique [0002] Today, when traditional energy sources are increasingly depleted and new energy sources are developing slowly, the most urgent task at present is to develop lining materials that are lightweight, high-strength, good in thermal shock stability, and high in operating temperature to meet the needs of high-temperature furnaces with lightweight structures, changing the traditional Due to the heavy structure, the ultra-high temperature kiln has the disadvantages of large heat capacity, low heating rate, high energy consumption, short service life, and large mid-term maintenance. It saves energy, reduces energy consumption, and serves the sustainable development of human beings. [0003] Since lightweight thermal insulation materials obtain low thermal conductivity by introduci...

Claims

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Application Information

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IPC IPC(8): C04B35/657C04B35/66
Inventor 王家邦王立旺
Owner ZHEJIANG UNIV
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