Abstract

The main results of studies devoted to the production of dense ceramics, namely ceramics based on aluminum–magnesium spinel (AMS), are presented. It is established that the introduction of modifying additives contributes to the production of dense ceramics with improved performance characteristics. The main trends in the action of sintering additives that do not react with the basic compound are described. It is found that the additive not only plays the role of a crystal growth restrictor during the elimination of porosity, but also intensifies the process of removing the pores. The defect formation schemes are drawn up for yttrium oxide and gallium oxide with aluminum–magnesium spinel. Additives that dissolve in the magnesium sublattice and create a high concentration of vacancies in the aluminum sublattice have a particularly positive effect on the porosity removal process. It is experimentally proven that the method of introducing the additive (for example, introducing gallium oxide) plays an important role in improving the properties of ceramics based on aluminum–magnesium spinel. If the additive is added to the AMS powder, then the relative density of the sample turns out to be higher than in the case of addition to the precursor and reaches to 91% of the theoretical value.

中文翻译：

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通过在MgAl2O4-Ga2O3体系中形成固溶体制备基于铝-镁尖晶石的致密陶瓷

摘要

介绍了致密陶瓷生产的主要研究结果，即基于铝镁尖晶石 (AMS) 的陶瓷。已确定引入改性添加剂有助于生产具有改进性能特征的致密陶瓷。描述了不与碱性化合物反应的烧结添加剂作用的主要趋势。发现添加剂在消除气孔过程中不仅起到了晶体生长限制剂的作用，而且还加强了去除气孔的过程。用铝镁尖晶石为氧化钇和氧化镓制定了缺陷形成方案。溶解在镁亚晶格中并在铝亚晶格中产生高浓度空位的添加剂对孔隙去除过程具有特别积极的影响。实验证明，引入添加剂的方法（如引入氧化镓）对提高铝镁尖晶石基陶瓷的性能具有重要作用。如果将添加剂添加到 AMS 粉末中，则样品的相对密度比添加到前体的情况下更高，达到理论值的 91%。