Electric melting production process for steady zirconium dioxide raw material and technique for producing steady zirconium dioxide product

A technology of zirconia and production methods, applied in the direction of zirconia, etc., can solve problems such as high-temperature non-ferrous metal smelting, easily polluted crystals, and high-quality artificial crystals affecting the development of artificial crystals, so as to promote industry development and avoid electrode pollution , the effect of high purity

Active Publication Date: 2008-08-20
SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It cannot meet the needs of high-temperature non-ferrous metal smelting, fused silica, especially high-temperature artificial crystal growth
It is easy to contaminate the crystal, and cannot grow high-quality IOL, which will affect the development of IOL

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] High-purity zirconia (ZrO) produced by the chemical reaction method of sodium carbonate 2 ≥99.95% as raw material, impurity content ≤10ppm), select high-purity rare earth oxide Y 2 o 3 (Y 2 o 3 ≥99.99%) as a stabilizer, 94.8% by weight of high-purity zirconia and 5.2% by weight of high-purity yttrium oxide are respectively charged into a mixer for homogenization to make charge. The charge is put into the three-phase electric arc furnace in batches for smelting, the electrode is lifted to maintain a long arc (the distance between the electrode and the melt is within 2cm, but not in contact), the melt is gradually fed at 2700°C, and the secondary voltage (electrode voltage) The temperature is 100 volts, the current is 1200 amps, and the melt is kept warm for another 1 hour (the holding current is 200 amps). Then refill, reheat, and then keep warm, and repeat the above process many times until a frit with a diameter of about 500mm is obtained, or the size can be determ...

Embodiment 2

[0027] According to the method of Example 1, wherein 92% by weight of high-purity zirconia and 8% by weight of high-purity yttrium oxide were respectively loaded into a mixer and homogenized to make charge. In the three-phase electric arc furnace, the melting material is gradually fed at 3000 ° C, the secondary voltage (electrode voltage) is 130 volts, the current is 1400 amps, and the temperature is kept for 1 hour to form ready-to-use finished sand or powder (that is, high-purity stable zirconia raw material ).

[0028] Stabilized zirconia raw materials with different particle sizes (32% of the stabilized zirconia raw materials with a particle size of 5-1mm, 28% of ≤1mm, 40% of ≤320 mesh) 100%, plus 5% of starch, 6% water is mixed in a mixer for 30 minutes, and it is molded by ≥100 tons of high pressure. The semi-finished product is then dried and fired in an ultra-high temperature kiln (2200°C) for 6 hours. After testing and inspection, qualified products are finally obta...

Embodiment 3

[0032]According to the method of embodiment 1, wherein high-purity zirconia 96% weight portion and light calcium carbonate 8% (corresponding to calcium oxide 4%) weight portion are respectively charged in the mixer and homogenized to make charge. In the three-phase electric arc furnace, the melting material is gradually fed at a temperature greater than 2700 ° C, the secondary voltage (electrode voltage) is 120 volts, the current is 1000 amps, and the temperature is kept for 1 hour to form ready-to-use finished sand or powder (that is, high-purity stable zirconia raw material).

[0033] Stabilized zirconia raw materials with different particle sizes (32% of the stabilized zirconia raw materials with a particle size of 3-1mm, 28% of ≤1mm, and 40% of ≤320 mesh) 100%, plus anhydrous alcohol 4 %, water 4%, mixed in a kneader for 30 minutes, and formed by ≥100 tons of high pressure. The semi-finished product is then dried and fired in an ultra-high temperature kiln (2000°C) for 6 ...

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Abstract

The invention relates to an electric melting production method for stable zirconium dioxide, which comprises following steps: adopting ZrO2 with the mass content of more than or equal to 99.95%, high-purity zirconia with the impurity microelements of no more than 10ppm, and high-purity yttria or calcium oxide as stabilizing agent to form furnace charge; melting using an electric arc with high temperature; controlling the electrodes to be not contacted with the liquid surface with the distance of no more than 2cm; naturally cooling after high temperature electric arc melting to form low-carbon white transparent crystal frit; grinding the frit into granular sand; acidwashing the granular sand using hydrochloric acid to form the finished sand; evenly mixing the stable zirconium dioxide material and organic bonding agent and forming through high pressure; calcining in a kiln with high temperature to form stable zirconium dioxide products. The zirconium dioxide produced using the method has the advantages of high purity with the ZrO2 plus (CaO)Y2O3 of more than or equal to 99.8%, high melting point of more than or equal to 2700 DEG C, increased normal service temperature of more than or equal to 2400 DEG C, and high cubic phase content of zirconium dioxide of 65 to 95%.

Description

technical field [0001] The invention belongs to a production method of a refractory material, and in particular relates to an electrofusion production method of a stabilized zirconia raw material and a production process of a stabilized zirconia product. Background technique [0002] With the rapid development of laser technology, people pay more and more attention to the application of laser, especially high-power laser, in civil and military applications. The core component of a solid-state laser is its working substance, which is the laser crystal. The key material of solid-state lasers is the laser host material, such as ND:YAG and ND:GGG crystals, which are excellent laser host materials. Usually, laser crystals are grown by pulling method at high temperature. Therefore, to obtain high-quality laser crystals, an appropriate temperature field is necessary. Therefore, the choice of the temperature field material is very important, the temperature field material directly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02C04B35/66C04B35/482
Inventor 王光强
Owner SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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