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首页> 外文会议>Biennial worldwide congress on refractories >SPINEL INVERSION AND LATTICE PARAMETERS IN CHROMIUM-FREE SPINEL SOLID SOLUTIONS
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SPINEL INVERSION AND LATTICE PARAMETERS IN CHROMIUM-FREE SPINEL SOLID SOLUTIONS

机译：无铬尖晶石固体溶液中的尖晶石反转和晶格参数

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摘要

The objective of this work was to investigate the amount of inversion in complex spinel solid solutions in order to understand the synthesis and sintering of magnesia-rich chromium-free complex spinels and their solid solutions. It has been observed that chromium-free spinels can be sintered at much lower temperatures (1350-1550°C) than the Cr~(3+) bearing versions, which require firing at 1720-1800°C, in order to achieve equivalent properties. The low temperature synthesis is due to the low temperature defect structure, leading to activated synthesis and sintering of the complex spinels. The inversion of the spinel was calculated using theoretical considerations and correlated to the observed inversion for experimental samples fired at various temperatures. The inversion in the complex spinel phase versus firing temperatures and composition were correlated to the densification of the ceramic specimens fired in air at temperatures ranging from 1350°C to 1550°C for 3 hours, in order to understand the effect of crystallographic changes in terms of the values of the lattice parameters of the complex spinel phase and their effects on the bulk density, open porosity and compressive strength of this new type of chromium-free basic refractory ceramics.
机译：这项工作的目的是研究复杂尖晶石固体溶液中的倒置量，以了解富含氧化镁的无铬复合尖晶石及其固溶体的合成和烧结。已经观察到铬纤维丝晶醇可以在比1720-1800°C下的Cr〜（3+）轴承版本下的低温（1350-1550℃）烧结，以实现等效性能。低温合成是由于低温缺陷结构，导致复合尖晶石的活化合成和烧结。使用理论考虑来计算尖晶石的反转，并与在各种温度下烧制的实验样品的观察到的反转相关。在复杂的尖晶石相对烧制温度和组成的反相进行了关联于陶瓷样品的致密化在空气中焙烧温度范围从1350℃至1550℃3小时，以了解的结晶学变化而言的效果复杂尖晶石相的晶格参数的值及其对堆积密度的影响，开放的孔隙率和这种新型无铬基本耐火陶瓷的抗压强度。

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