Abstract Four mixtures of kaolinite clay and feldspar (Western-Cameroon) were prepared and sintered at 1200 °C for 2 h at the heating rate of 5 °C/min, 10 °C/min, 15 °C/min and 20 °C/min. The main new crystalline phase was mullite associated with quartz, anatase and cristobalite for all heating rates. By increasing the feldspar content, both the amounts of mullite and of glassy phase increase which promotes the densification of the samples. Heating rate has less influence on the formation of new mineral phases, while this process is sensitive to flux content. Both heating rate and flux content have an effect on the microstructure of the fired bodies as well as technological properties. The specimens with 30% feldspar content sintered at 1200 °C from 5 °C/min to 20 °C/min exhibited water absorption values <10% and bending strength >12 MPa. These materials are suitable as wall tiles. Thus, these samples can be sintered at a heating rate of 20 °C/min instead of 5 °C/min which leads to a saving in firing time and in energy.

中文翻译：

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助熔剂含量和升温速率对Mayouom（西喀麦隆）高岭石粘土基陶瓷微观结构和工艺性能的影响

摘要 制备了四种高岭石粘土和长石（西喀麦隆）混合物，并在 1200 °C 下以 5 °C/min、10 °C/min、15 °C/min 和 20 °C 的升温速率烧结 2 h。 /分钟。对于所有加热速率，主要的新晶相是与石英、锐钛矿和方石英相关的莫来石。通过增加长石含量，莫来石和玻璃相的量都增加，这促进了样品的致密化。加热速率对新矿物相的形成影响较小，而该过程对熔剂含量敏感。加热速率和助熔剂含量对烧制体的微观结构和工艺性能都有影响。长石含量为 30% 的试样在 1200 °C 下以 5 °C/min 到 20 °C/min 烧结，吸水值 <10% 和弯曲强度 >12 MPa。这些材料适合作为墙砖。因此，这些样品可以以 20°C/min 的加热速率烧结，而不是 5°C/min，从而节省了烧制时间和能源。