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首页> 外文期刊>Boletin de la Sociedad Espanola de Ceramica y Vidrio >Synthesis of Ba_(0.75)Sr_(0.25)Al_2Si_2O_8 - ZrO_2 Ceramic Composites by Solid State Reaction of Mechanically Activated Precursor Mixtures
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Synthesis of Ba_(0.75)Sr_(0.25)Al_2Si_2O_8 - ZrO_2 Ceramic Composites by Solid State Reaction of Mechanically Activated Precursor Mixtures

机译：机械活化的前驱体混合物的固相反应合成Ba_（0.75）Sr_（0.25）Al_2Si_2O_8-ZrO_2陶瓷复合材料。

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摘要

Precursor mixtures composed of fly ash, BaCO_3, SrCO_3, Al_2O_3 and ZrO_2, were subjected to attrition milling for 0-8 h and then uniaxially pressed and sintered at 900-1500 °C/5 h, for the in situ solid state synthesis of composites with nominal Ba_(0.75)Sr_(0.25)Al_2Si_2O_8 (SBAS)/ZrO_2 mass ratios of: 1) 90/10, 2) 70/30, and 3) 50/50. Mechanical activation, combined with the likely generation of a considerable amount of transient liquid during sintering of the composites, notably enhanced the reactivity of the precursor mixtures. ZrO_2 decreased the conversion from the hexagonal (Hexacelsian) into the monoclinic (Celsian) phases of SBAS in the composites, which became more pronounced when the content of ZrO_2 was increased in the materials. Nearly full conversions could be achieved at temperatures as low as 1100 °C, by mechanically activating the precursor mixtures for times that increased with increasing content of ZrO_2 in the materials. An increment in the time of mechanical activation of the precursor mixtures, as well as in their ZrO_2 content and in the sintering temperature, increased the mechanical properties of the synthesized materials. Thus, the best mechanical properties were obtained for composition 3 milled for 8 h and sintered at 1500 °C.
机译：将由粉煤灰，BaCO_3，SrCO_3，Al_2O_3和ZrO_2组成的前体混合物进行0-8 h研磨，然后在900-1500°C / 5 h进行单轴压制和烧结，以进行复合材料的原位固态合成Ba_（0.75）Sr_（0.25）Al_2Si_2O_8（SBAS）/ ZrO_2标称质量比为：1）90/10，2）70/30，3）50/50。机械活化以及在复合材料的烧结过程中可能产生大量的瞬态液体，显着提高了前体混合物的反应性。 ZrO_2降低了复合材料中SBAS的六方相（六方相）向单斜相（Celsian相）的转化，当材料中ZrO_2含量增加时，这一点更加明显。在低至1100°C的温度下，通过机械活化前驱物混合物的时间随材料中ZrO_2含量的增加而增加，几乎可以实现完全转化。前体混合物的机械活化时间，其ZrO 2含量和烧结温度的增加，增加了合成材料的机械性能。因此，对于研磨8小时并在1500℃下烧结的组合物3，获得了最佳的机械性能。

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