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Preparation and flash sintering of MgTiO_3 nanopowders obtained by the polyacrylamide gel method

机译：聚丙烯酰胺凝胶法制备MgTiO_3纳米粉体及其快速烧结

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Using a polyacrylamide gel method, phase pure and well-dispersed MgTiO3 nanopowders were prepared at 800 degrees C for 2 h. It was found that a high mole ratio of monomers to precursors resulted in low formation temperature of MgTiO3, due to the highly mixing homogeneity and smaller particle sizes of precursors. Sintering behaviors of MgTiO3 nanopowders under DC electric field from 500 to 800 V/cm were investigated. Nearly full dense MgTiO3 ceramics can be prepared in 30 s. An abrupt and simultaneous increase in current density and power dissipation were observed in sintering process, which are characteristics of flash sintering. The power dissipation for the flash sintering was found to be 82 mW/mm(3). The densities and average grain sizes of samples increase with the increase of the electrical field strength. It was suggested that Joule heating was the main mechanism of flash sintering of MgTiO3 ceramics. Our work provides a useful route for the fabrication of dense MgTiO3 ceramics at low temperature in short time. (C) 2018 Elsevier B.V. All rights reserved.
机译：使用聚丙烯酰胺凝胶法，在800摄氏度下2小时制备了相纯且分散均匀的MgTiO3纳米粉。发现由于高混合均匀性和较小的前体颗粒，单体与前体的高摩尔比导致MgTiO3的形成温度低。研究了在500至800 V / cm的直流电场下MgTiO3纳米粉体的烧结行为。 30秒内即可制备出几乎完全致密的MgTiO3陶瓷。在烧结过程中观察到电流密度和功率消耗突然并同时增加，这是闪速烧结的特征。发现闪光烧结的功耗为8​​2 mW / mm（3）。样品的密度和平均晶粒尺寸随着电场强度的增加而增加。有人认为焦耳加热是MgTiO3陶瓷快速烧结的主要机理。我们的工作为在短时间内低温制造致密的MgTiO3陶瓷提供了一条有用的途径。 （C）2018 Elsevier B.V.保留所有权利。

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