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alpha-Sialon -AIN-Polyty poid Composite Ceramics

机译：alpha-Sialon -AIN-聚脂复合陶瓷

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摘要

alpha-Sialon-AIN-polytypoid duplex ceramics could be obtained via the formation of (alpha-Sialon in the compositions M.Siiz 3xA13xOxN16-x(M=Ca or multi-cation Ca/Mg) with x > = 1.0 by hol-pressing at 1750 deg C for 1 h. The content of AIN-polytypoid phase in the product increased with increasing x value of the compositions. The advantages by using multi-cation Ca/Mg as a-Sialon stabilizer to fabricate a-Sialon-AIN-polytypoid composite ceramics are obvious. The materials with CaO and MgO as additives of a-Sialon possess a better sintering ability TEM results show that most of the added Mg2+ enters into AIN-polytypoid phase in (Ca,Mg)-alpha-Sialon case. The formation of Mg-containing AIN-polytypoid phase in the composite materials could provide a valid way to reduce the amount of glassy phase at the grain boundary, which gives material a higher hardness in comparison with its single-cation counterpart. It was also found that the fiber-like morphology of AIN- polytypoid in the conmposite ceramics has a toughening effect on the mechanical property of the materials.
机译：α-Sialon-AIN-多型双相陶瓷可通过以下方法制得：（x。= 1.0时，通过热压法形成（M.Siiz 3xA13xOxN16-x（M = Ca或多阳离子Ca / Mg）在1750℃下保温1 h。产品中AIN-多型相的含量随组合物x值的增加而增加。使用多阳离子Ca / Mg作为a-Sialon稳定剂制造a-Sialon-AIN-的优点CaO和MgO作为a-Sialon添加剂的材料具有较好的烧结性能，TEM结果表明，在（Ca，Mg）-α-Sialon的情况下，大部分添加的Mg2 +进入AlN-多型相。复合材料中含Mg的AIN-多型相的形成可以为减少晶界玻璃相的含量提供有效途径，与单阳离子对应物相比，具有更高的硬度。 AIN-多型性的纤维状形态陶瓷对材料的机械性能具有增韧作用。

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