Processing of Open Porous Zirconia via Alkane‐Phase Emulsified Suspensions for Plasma Applications
Processing of Open Porous Zirconia via Alkane‐Phase Emulsified Suspensions for Plasma Applications
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DOI：
10.1111/j.1744-7402.2010.02521.x
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发表时间：
2011
影响因子：
2.1
通讯作者：
E. Ewais;S. Barg;G. Grathwohl;A. Garamoon;N. Morgan
中科院分区：
文献类型：
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作者：
E. Ewais;S. Barg;G. Grathwohl;A. Garamoon;N. Morgan
研究了用乳化陶瓷粉末悬浮液直接发泡法制备多孔氧化锆的工艺。表面活性剂稳定的庚烷液滴均匀地分散在具有最大固体负载的氧化锆粉末的水性悬浮液中。烧结多孔部件的孔隙率随着乳化悬浮液中庚烷含量的增加而增加。另一方面，弯曲强度随着庚烷含量的降低而增加。多孔氧化锆样品被用作大气压等离子体系统中的介电屏障。使用空气作为工作气体，通过在50 Hz下施加不同的电压来为等离子体系统供电。在施加电压（击穿电压）的极限值下，在所有样品中观察到丝状放电模式。孔隙浓度高、孔径大小合适的样品除表现出常规放电模式外，还表现出辉光放电模式。讨论了氧化锆的孔隙率对辉光放电模式形成的影响。
Processing of porous zirconia by direct foaming of emulsified ceramic powder suspensions was examined. Surfactant stabilized heptane droplets were homogeneously dispersed in the aqueous suspension with maximum solids loading of zirconia powder. The porosity of the sintered porous parts increased with the amount of heptane in the emulsified suspensions. On the other hand, the bending strength increased with the decreasing heptane content. Porous zirconia samples were used as a dielectric barrier in an atmospheric pressure plasma system. The plasma system was powered by different applied voltages at 50 Hz using air as a working gas. Filamentary discharge mode was observed in all samples at a limit value of the applied voltage (breakdown voltage). Samples with high concentration of pores and suitable pore size exhibited a glow discharge mode beside the filamentary discharge mode. The effect of the porosity of zirconia on the formation of the glow discharge mode was discussed.