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| Study on preparation and performance of small-size ZrO2 nozzle for powder production by gas atomization |
| WANG Laiwen，YU Jianbin，MAWeikui，WANG Gang，DU Penghui，WANG Wenwu |
| Sinosteel Luoyang institute of Refractories Research CO.，Ltd，State Key Laboratory of Advanced Refractories，
Luoyang 471039，China |
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Abstract The small-size ZrO2 nozzle bodies were prepared by hot injection moulding with Y2O3 stabilized ZrO2
and monoclinic ZrO2 as the main materials, the amount of Y2O3 is 2%, 4 % and 6% respectively. After degreasing,
the body was sintered at 1 650, 1 700 and 1 750 ℃ for 5 h, respectively. The effects of sintering temperature and
Y2O3 addition amount on the performance of small- size ZrO2 nozzle were studied, and the online service performance
was compared. The results shows that with the increase of sintering temperature and Y2O3 content, the density
and room temperature folding strength of the samples are gradually increased, the structure is more compact, the
content of c-ZrO2 phase increases, and the linear expansion rate increases. The linear expansion rate of the sample
with Y2O3 content of 6 % is significantly higher than that of the sample with Y2O3 content of 2 % and 4 %. The high
stabilization interest rate and dense structure are not conducive to the thermal shock resistance of ZrO2 nozzles. The
ZrO2 small-size nozzle prepared by adding 4% Y2O3 and sintering at 1 700 °C for 5 h has the best comprehensive
performance and the best on-line service performance.
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Received: 27 October 2021
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2022, Vol. 32 
