Ye’elimite is formed during the production of sulfoaluminate cement. In this article, the orthorhombic ye’elimite formation, the optimal synthesis conditions and the microstructural evolution during synthesis, by solid-state reaction from pure oxide raw materials, is investigated. The phase assemblage was substantially affected by temperature and duration of sintering. Making reference to Rietveld quantitative analysis results, optimal solid-state synthesis conditions of ye’elimite was 1300 °C for 3 h. During ye’elimite synthesis, significant gas releases were observed at different stages of firing using TGA coupled with mass-spectrometer. The gases are the product of carbonate decomposition, gypsum dehydration and sulfate decomposition from the unreacted anhydrite and the formed ye’elimite. Based on the present work, it emerges that a key strategy for forming ye’elimite with a high purity is to compensate sulfate decomposition by the addition of a slight excess of CaSO₄ before repeating the firing cycle at optimal conditions. Finally, the porosity was investigated using Archimedes principle measurements compared to BSE-image analysis. It shows the difficulty to achieve dense sintered ye’elimite because of the high decomposition gas releases during the firing process.

极限是在生产硫铝酸盐水泥时形成的。本文研究了纯氧化物原料的固相反应，形成了正交晶的叶界，最佳的合成条件和合成过程中的微观结构演变。相的组装基本上受温度和烧结持续时间的影响。参考Rietveld定量分析结果，最佳的固态合成条件为1300°C 3 h。在无限合成期间，使用TGA和质谱仪在燃烧的不同阶段观察到大量气体释放。气体是未反应的硬石膏和生成的石的碳酸盐分解，石膏脱水和硫酸盐分解的产物。根据目前的工作，在最佳条件下重复点火周期之前为₄。最后，与阿布扎比（BSE）图像分析相比，使用阿基米德原理测量方法研究了孔隙率。由于烧制过程中分解气体的释放量很高，因此很难达到致密的烧结极限。