Method for preparing partly stable zirconium dioxide
A zirconia, stable technology, applied in zirconia and other directions, can solve the problems of high energy consumption, high equipment operating costs, long operating time, etc., and achieve the effect of small temperature difference and high operating cost improvement
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Embodiment 1
[0014] Take 250g of desiliconized zirconium castable material crushed in a jaw crusher to a particle size of -50mm and smelted in a DC electric arc furnace. Its crystal form is a fully stable cubic phase. , put it into the microwave reaction chamber of a microwave reactor with a microwave frequency of 2450MHz and a power of 2000W, adjust the microwave output power to 850W, carry out microwave radiation heating, keep at a temperature of 1350°C for 120min, and then under the cooling mechanism of 5°C / min Perform aging annealing treatment for 70 minutes, and when the temperature reaches 1000°C, discharge the material by adjusting the discharge mechanism to carry out normalizing air cooling treatment. After reaching room temperature, take a sample and grind it for X-ray diffraction analysis, and obtain a part with a monoclinic phase content of 17%. Stabilized zirconia, analyzed locally through a scanning electron microscope, has no cracks and only a small amount of air bubbles in th...
Embodiment 2
[0016] Take the zirconia melt melted by the arc method and use calcium oxide as a stabilizer, and blow it with compressed air to make 300g of zirconia hollow balls with a particle size of 0.5mm-1.5mm. Add the air-connected insulation material to the microwave reaction chamber of a microwave reactor with a microwave frequency of 2450MHz and a power of 2000W. The aging annealing treatment was carried out for 150 minutes under the cooling mechanism of 1 min, and when the temperature reached 950 ° C, the material was discharged by adjusting the discharge mechanism for normalizing air cooling treatment, and after reaching room temperature, the sample was ground for X-ray diffraction analysis to obtain the monoclinic phase content It is 28% partially stabilized zirconia hollow spheres, and the refractory material series prepared from this zirconia hollow spheres are suitable for high-temperature lining materials directly in contact with flames in thermal equipment in metallurgy, chem...
Embodiment 3
[0018] Take the zirconium dioxide precursor zirconium hydroxide gel 5008 stabilized with calcium oxide, firstly dry and dehydrate it in a microwave field with a power of 1000W and a microwave frequency of 2450MHz at a temperature of 200°C for 30min, and the processed precursor is Weak absorbing material, through the automatic lifting device, insert a material that can absorb microwaves well into the material for auxiliary heating, adjust the microwave output power to 850W, and when the temperature rises to 800°C, use the automatic lifting mechanism to withdraw from the microwave auxiliary heating Materials, make microwave energy directly act on the raw material and continue to heat up to 1300°C and keep it warm for 120min, then perform aging annealing treatment for 150min under the cooling mechanism of 2°C / min, and when the temperature reaches 1000°C, release it by adjusting the discharge mechanism The material is air-cooled, the weight loss rate of the powder is 47.48%, and th...
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