Method for preparing zirconium oxide nozzle brick with high temperature thermal shock resistance
A technology of thermal shock resistance and zirconia, which is applied in the field of refractory materials, can solve the problems of poor control of segregation content of additives, difficulty in removing impurity components, difficulty in crushing, etc., and achieve excellent high temperature thermal shock resistance and corrosion resistance. The effect of small sample shrinkage and high bulk density
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[0017] Specifically, the preparation method of the high-temperature thermal shock-resistant zirconia nozzle brick provided by the present invention includes:
[0018] 1. Grind the fused zirconia powder until the particle size is above 14500 mesh, the proportion of powder is 28wt% ~ 33wt%, the proportion of 8500 mesh ~ 14500 mesh powder is 23wt% ~ 29wt%, the proportion of 4500 mesh ~ 8500 mesh powder is 39wt% %-45wt%, powder below 4500 mesh accounts for ≤3wt%;
[0019] 2. Mix the ground zirconia powder and carbonamide in a weight ratio of 1:0.85~1.35 (preferably until uniform), and then calcine at 135~180°C without air or in an inert atmosphere for 8~ After 12 hours, add the calcined zirconia powder into a dilute acid solution with a mass concentration of 1.0-2.0%, stir and soak for more than 1 hour;
[0020] 3. Add 2.3-2.8% magnesium oxide, 0.5-0.9% yttrium oxide and 4-8% binding agent based on the weight of the zirconia powder into the soaked zirconia powder, mix (preferably...
Embodiment 1
[0032] 1. Add ZrO 2 The fused desiliconized zirconia powder with a content of 99.0% is ground to a particle size of 14,500 mesh or more, accounting for 31.5wt%, 8,500-14,500-mesh powder accounts for 25.5wt%, and 4,500-8,500-mesh powder accounts for 41wt% %, powder below 4500 mesh accounts for 2wt%;
[0033] 2. Take the above-ground zirconia powder and carbonamide and mix them evenly at a weight ratio of 1:1.05, then seal them at 175°C and roast them at a constant temperature for 10 hours. The roasted zirconia powders are directly added to the prepared mass concentration Stir and soak in 1.0% dilute hydrochloric acid solution for 120min;
[0034] 3. Wash and dry the soaked zirconia powder, add 2.65% MgO and 0.75% Y 2 o 3 and 5% polyvinyl alcohol, after mixing evenly, carry out 6 times of roll granulation, and sieve until the 5-mesh sieve is completely passed;
[0035] 4. Press and sinter the powder obtained in step 3 under a pressure of 30-40 MPa to form a high-temperature ...
Embodiment 2
[0042] 1. Add ZrO 2 The fused desiliconized zirconia powder with a content of 99.0% is ground to a particle size of 14,500 mesh or more, accounting for 29.7wt%, 8,500-14,500-mesh powder accounts for 27.5wt%, and 4,500-8,500-mesh powder accounts for 40wt% %, powder below 4500 mesh accounts for 2.8wt%;
[0043] 2. Take the above-ground zirconia powder and carbonamide and mix them evenly in a weight ratio of 1:0.85, then roast at 135°C for 8 hours at a constant temperature in isolation from the air, and directly add the roasted zirconia powder to the prepared mass concentration Stir and soak in 1.5% dilute sulfuric acid solution for 60 minutes;
[0044] 3. Wash and dry the soaked zirconia powder, add 2.3% MgO and 0.5% Y 2 o 3 and 6% polyvinyl alcohol, after mixing evenly, carry out 5 roll granulation;
[0045] 4. Press and sinter the powder obtained in step 3 under a pressure of 30-40 MPa to form a high-temperature thermal shock-resistant zirconia nozzle brick. The sintering te...
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