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High-temperature-resistant low-shrinking-percentage nano-scale microporous heat insulating material for steel ladle and preparation method therefor
The invention relates to a high-temperature-resistant low-shrinking-percentage nano-scale microporous heat insulating material for a steel ladle and a preparation method therefor. The heat insulating material is prepared from the following raw materials in percentage by weight: 0-60% of nano-scale silica powder, 0-50% of zirconium silicate micropowder, 5-10% of high silica fiber and 0-50% of gamma-alumina micropowder. Through adding a high-temperature antishrinking agent (alpha-alumina micropowder or gamma-alumina micropowder) into the formula, the high-temperature shrinkage resistance of the heat insulating material is improved, the linear shrinkage ratio (at the temperature of 950 DEG C) is not higher than 2%, the high-temperature shrinkage is reduced, and the safety is improved when the heat insulating material is applied to steel ladle equipment; according to the prepared nano-scale microporous heat insulating material, the service temperature is 1,100 DEG C, the coefficient of thermal conductivity at the temperature of 800 DEG C is not greater than 0.045, the linear shrinkage ratio at the temperature of 950 DEG C in 4 hours is not higher than 2.0%, and the compression strength (at the compression ratio of 10%) is not lower than 0.6MPa; and the high-temperature-resistant low-shrinking-percentage nano-scale microporous heat insulating material for the steel ladle, prepared by the preparation method, has the advantages of high service temperature, small coefficient of thermal conductivity, high compressive strength and low high-temperature linear shrinkage ratio and is applicable to high-temperature equipment with space limitations such as steel ladles for steelmaking, rotary kilns and the like.
High-temperature-resistant low-shrinking-percentage nano-scale microporous heat insulating material for steel ladle and preparation method therefor
The invention relates to a high-temperature-resistant low-shrinking-percentage nano-scale microporous heat insulating material for a steel ladle and a preparation method therefor. The heat insulating material is prepared from the following raw materials in percentage by weight: 0-60% of nano-scale silica powder, 0-50% of zirconium silicate micropowder, 5-10% of high silica fiber and 0-50% of gamma-alumina micropowder. Through adding a high-temperature antishrinking agent (alpha-alumina micropowder or gamma-alumina micropowder) into the formula, the high-temperature shrinkage resistance of the heat insulating material is improved, the linear shrinkage ratio (at the temperature of 950 DEG C) is not higher than 2%, the high-temperature shrinkage is reduced, and the safety is improved when the heat insulating material is applied to steel ladle equipment; according to the prepared nano-scale microporous heat insulating material, the service temperature is 1,100 DEG C, the coefficient of thermal conductivity at the temperature of 800 DEG C is not greater than 0.045, the linear shrinkage ratio at the temperature of 950 DEG C in 4 hours is not higher than 2.0%, and the compression strength (at the compression ratio of 10%) is not lower than 0.6MPa; and the high-temperature-resistant low-shrinking-percentage nano-scale microporous heat insulating material for the steel ladle, prepared by the preparation method, has the advantages of high service temperature, small coefficient of thermal conductivity, high compressive strength and low high-temperature linear shrinkage ratio and is applicable to high-temperature equipment with space limitations such as steel ladles for steelmaking, rotary kilns and the like.
High-temperature-resistant low-shrinking-percentage nano-scale microporous heat insulating material for steel ladle and preparation method therefor
SUN GUANGYING (author) / ZHAO RUILIN (author) / WANG HUAIXU (author) / QI HONGJUN (author) / QIAN GUANGHUA (author) / PENG QIANBING (author)
2015-11-25
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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