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Powder preparation and compaction behaviour of fine-grained Y-TZP

机译:粉末制备及细晶Y-TZp的压实行为

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摘要

Two wet chemical preparation methods are described for yttria-doped tetragonal zirconia powders. Both methods yield powders with an extremely small crystallite size (8 nm) and a narrow size distribution. The agglomerate and aggregate structure of these powders have been investigated by several techniques. Gel precipitation from an alkoxide solution in water (ldquoalkoxiderdquo synthesis) results in a ceramic powder with irregular-shaped weak and porous agglomerates, which are built up from dense aggregates with a size of 18 nm. Gel precipitates formed from a metal-chloride solution in ammonia (ldquochloriderdquo synthesis) do not contain aggregates. Both types of agglomerate are fractured during isostatic compaction. Hydrolysis and washing under (strong) basic conditions probably decrease the degree of aggregation. The aggregate morphology and structure are key parameters in the microstructure development during sintering of a ceramic. Several characteristics of these powders are compared with those of a commerical one (Toyo Soda TZ3Y).
机译:描述了用于掺杂氧化钇的四方氧化锆粉末的两种湿法化学制备方法。两种方法均产生具有极小的微晶尺寸(8 nm)和窄尺寸分布的粉末。这些粉末的附聚物和聚集体结构已经通过几种技术进行了研究。从水中的醇盐溶液中沉淀出来的凝胶(“ alkalkoxiderdquo合成”)导致陶瓷粉末具有不规则形状的弱且多孔的附聚物,这些附聚物是由大小为18 nm的致密聚集体构成的。由氨中的金属氯化物溶液形成的凝胶沉淀物(氯代二氯乙烯合成)不包含聚集体。两种类型的附聚物在等静压过程中均会破裂。在(强)碱性条件下进行水解和洗涤可能会降低聚集程度。聚集体的形态和结构是陶瓷烧结过程中微观结构发展的关键参数。将这些粉末的几种特性与商用粉末(Toyo Soda TZ3Y)进行了比较。

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