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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Lowering of CaZrO_3 sintering temperature using lithium-calcium fluoride flux addition
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Lowering of CaZrO_3 sintering temperature using lithium-calcium fluoride flux addition

机译：添加锂-氟化钙助熔剂降低CaZrO_3的烧结温度

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摘要

The effects of a lithium-calcium fluoride flux on the sintering and the low frequency dielectric properties of acceptor/donor-doped CaZrO_3 ceramics were investigated. The acceptor(Mn)/donor(W) doping was used to avoid reduction of Zr in the CaZrO_3 ceramics. The lithium-calcium fluoride flux was selected since liquid phase sintering lower the CaZrO_3 sintering temperature. With such additions, several low-temperature mechanisms emerge and the sintering temperatures can be effectively lowered. A simple model was used to analyse these different mechanisms in terms of their origin and efficiency. The dielectric properties of CaZrO_3 with flux additions are strongly dependent on the densification. CaZrO_3 ceramics sintered at high temperature without any addition display a high permittivity, low losses and a good behaviour under electrical field and temperature. Using this flux, CaZrO_3 can be sintered below the nickel's melting point (1450 deg C) and 92 percent of the theoretical density tan be achieved. The dielectric properties at 1 MHz are then epsilon_r approx= 34 and a loss factor close to 0.1 percent.
机译：研究了锂-氟化钙助熔剂对受主/受主掺杂CaZrO_3陶瓷的烧结和低频介电性能的影响。掺杂受主（Mn）/施主（W）可以避免CaZrO_3陶瓷中Zr的减少。之所以选择锂-氟化钙助熔剂，是因为液相烧结降低了CaZrO_3的烧结温度。通过这种添加，出现了几种低温机理，并且可以有效地降低烧结温度。一个简单的模型被用来分析这些不同机制的起源和效率。添加助熔剂的CaZrO_3的介电性能强烈依赖于致密化。在没有任何添加的情况下高温烧结的CaZrO_3陶瓷表现出高介电常数，低损耗以及在电场和温度下的良好性能。使用该助熔剂，可以在镍的熔点（1450摄氏度）以下烧结CaZrO_3，并达到理论密度tan的92％。然后，在1 MHz时的介电特性为epsilon_r大约= 34，损耗因子接近0.1％。

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