The present work aims at studying the effect of the sintering temperature and magnesite addition on the structure and final properties of silicate ceramics tapes. A kaolinitic clay from Algeria was selected and mixed with different magnesite contents (≤12 mass%). Tape casting process was used to produce the green tapes in an aqueous system with optimized amount of surfactants. The green tapes were fired from 1000°C to 1200°C using a dwelling time of 30 minutes. The effect of the dwelling time was investigated for a firing temperature of 1200°C namely: 30 minutes, 1 hour 30 minutes and 3 hours for samples with 6 and 12 mass% of magnesite. Regarding firing conditions, crystalline phases, thermal conductivity, porosity, and flexural strength were analyzed. The results showed that increasing the sintering temperature to 1200°C tended to significantly decrease the total porosity of samples, which led to the improvement of the stress to rupture values. Specimens with 6 and 12 mass% sintered during 3 hours exhibited highest stress to rupture values (≈117 MPa) and lowest thermal conductivity (<0.2 W.m⁻¹.K⁻¹) and moderate open porosity (27%). The as‐obtained ceramics appeared promising for further utilization in refractory industry, thanks to the presence of both cordierite and mullite phases.

中文翻译：

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高岭石-菱镁矿带的烧结和最终性能，用于制造堇青石-莫来石陶瓷

本工作旨在研究烧结温度和菱镁矿添加量对硅酸盐陶瓷带结构和最终性能的影响。选择来自阿尔及利亚的高岭土并与不同菱镁矿含量（≤12质量％）混合。胶带浇铸工艺用于在水性体系中使用最适量的表面活性剂生产生胶带。使用30分钟的停留时间将生带从1000℃烧成1200℃。研究了焙烧温度为1200°C的停留时间的影响，即：对于质量分数为6和12的菱镁矿的样品，分别为30分钟，1小时，30分钟和3小时。关于烧成条件，分析了结晶相，导热率，孔隙率和抗弯强度。结果表明，将烧结温度提高到1200°C倾向于显着降低样品的总孔隙率，从而导致应力-断裂值的提高。在3小时内烧结了6质量％和12质量％的样品显示出最高的破裂应力值（≈117MPa）和最低的导热率（<0.2 Wm）^-1 .K ^-1）和中等孔隙率（27％）。由于堇青石和莫来石相的存在，所获得的陶瓷有望在耐火工业中得到进一步利用。