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首页> 外文期刊>Journal of Materials Research >Directionally solidified Al_2O_3/ZrO_2 eutectic ceramic prepared with induction heating zone melting
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Directionally solidified Al_2O_3/ZrO_2 eutectic ceramic prepared with induction heating zone melting

机译：感应加热区熔融制备定向凝固Al_2O_3 / ZrO_2共晶陶瓷

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摘要

To prepare high quality large solidified Al2O3/ZrO2 eutectic ceramic, the preparation processing of the presintered ceramic as a feed rod was investigated via experiments; some parameters of the induction heating zone process were optimized via numerical modeling; an Al2O3/ZrO2 eutectic ceramic rod with a diameter 10 mm was prepared. The results show that increasing the sintering temperature could increase the presintered ceramic's bulk density, while increasing sintering time had little effect. And the bulk density increased first and then decreased with the molding pressure increase. And the saucer coil obtained a higher temperature gradient than the tubbiness coil for a fixed crucible wall maximum temperature, and the coil turn's increase could increase the melting zone height in the induction zone melting process. In the directionally solidified Al2O3/ZrO2 eutectic ceramics, Al2O3 phase is the matrix phase, and the ZrO2 phase embedded in the Al2O3 phase mostly with the rod shape, and little with lamellar. The hardness of directionally solidified eutectic ceramics reaches 16.17 GPa and the fracture toughness reaches 4.76 MPa m(1/2), which are 1.7 times and 1.5 times of the presintered eutectic ceramic, respectively.
机译：为了制备高质量的大型凝固Al2O3 / ZrO2共晶陶瓷，通过实验研究了预烧结陶瓷作为进料棒的制备工艺。通过数值模型优化了感应加热区工艺的一些参数。制备直径为10mm的Al 2 O 3 / ZrO 2共晶陶瓷棒。结果表明，提高烧结温度可以提高预烧结陶瓷的堆积密度，而增加烧结时间影响不大。随着成型压力的增加，堆积密度先增加，然后减少。在固定的坩埚壁最高温度下，碟形盘管的温度梯度要比桶形盘管的温度梯度高，并且盘管匝数的增加可能会增加感应区熔化过程中的熔化区高度。在定向凝固的Al2O3 / ZrO2共晶陶瓷中，Al2O3相为基体相，而嵌入Al2O3相中的ZrO2相则大多为棒状，很少为层状。定向凝固共晶陶瓷的硬度达到16.17 GPa，断裂韧性达到4.76 MPa m（1/2），分别是预烧结共晶陶瓷的1.7倍和1.5倍。

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