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首页> 外文期刊>Journal of the American Ceramic Society >Effect of Doping on the Thermal Expansion of β Eucryptite Prepared by Sol-Gel Methods
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Effect of Doping on the Thermal Expansion of β Eucryptite Prepared by Sol-Gel Methods

机译：掺杂对溶胶-凝胶法制备β-锂霞石热膨胀的影响

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摘要

The thermal expansion behavior of pure p-eucryptite and Zn-doped p-eucryptite (substituting Zn for Li), prepared using sol-gel methods and hot pressing, were investigated. P-eucryptite exhibits an anisotropic negative coefficient of thermal expansion (CTE), which leads to microcrack formation in sintered polycrystalline samples. This is manifested by the presence of a hysteresis in the thermal expansion curves. The hysteresis disappears when a small amount of Zn (0.5-3 mol% Zn) is present. Furthermore, the bulk CTE increases significantly in magnitude (from -4 × 10~(-6)/℃ for pure p-eucryptite to 1 × 10~(-6)/℃ to 2 × 10~(-6)/℃), and is slightly positive in the range from 25℃ to 1000℃. No difference in grain size was observed between the pure and doped samples, and all the ceramics exhibited high relative densities. It is likely that Zn substitutes for Li in the p-eucryptite structure and reduces the c-axis thermal expansion, thereby lowering the CTE anisotropy and lowering the tendency for microcracking.
机译：研究了采用溶胶-凝胶法和热压法制备的纯p-锂霞石和Zn掺杂p-锂霞石的热膨胀行为。 P-锂霞石表现出各向异性的负热膨胀系数（CTE），从而导致在烧结的多晶样品中形成微裂纹。这通过热膨胀曲线中存在滞后来证明。当存在少量的Zn（0.5-3 mol％Zn）时，磁滞消失。此外，整体CTE的幅度显着增加（从纯p-锂霞石的-4×10〜（-6）/℃增加到1×10〜（-6）/℃到2×10〜（-6）/℃） ，在25℃至1000℃范围内为正。在纯样品和掺杂样品之间未观察到晶粒尺寸的差异，并且所有陶瓷均表现出较高的相对密度。 Zn可能会替代p-锂霞石结构中的Li，并降低c轴热膨胀，从而降低CTE各向异性并降低微裂纹的趋势。

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  • 来源
    《Journal of the American Ceramic Society》 |2012年第9期|p.2939-2943|共5页
  • 作者

    Subramanian Ramalingam; Ivar E. Reimanis;

  • 作者单位

    Colorado Center for Advanced Ceramics, Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401;

    Colorado Center for Advanced Ceramics, Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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