Abstract The influence of advanced thermal insulation on energy consumption and temperature distribution during electric field assisted sintering of conductive stainless steel powder and non-conductive zirconia powder was investigated. Four types of tool setup were considered: i) without insulation, ii) with die wall insulation, iii) with additional insulation of die faces and iv) with spacers manufactured from carbon fiber reinforced carbon composite (CFRC). The influence of thermal insulation on energy consumption was experimentally studied for samples with diameter of 17 mm. The temperature distribution in samples with diameters of 17 mm, 50 mm and 150 mm was modeled using the Finite Element Method. The power consumed during dwell was almost half the value when die wall insulation was used. The additional insulation of die faces and the application of CFRC spacers provide a threefold decrease in power during sintering of steel powder and a fivefold reduction during sintering of zirconia powder. The advanced thermal insulation significantly homogenizes the temperature distribution within samples of small and medium size. The advanced thermal insulation provides a strong decrease in the temperature gradient inside large conductive sample with a diameter of 150 mm. However, insulation apparently cannot ensure acceptable temperature homogeneity within non-conductive parts of such diameter. The reason for this is the specific current path and related heat concentration near the sample edge.

中文翻译：

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通过先进的绝热技术提高场辅助烧结的效率

摘要 研究了先进绝热技术对导电不锈钢粉末和非导电氧化锆粉末电场辅助烧结过程中能耗和温度分布的影响。考虑了四种类型的工具设置：i) 没有绝缘，ii) 有模具壁绝缘，iii) 有额外的模具面绝缘和 iv) 使用由碳纤维增强碳复合材料 (CFRC) 制造的垫片。对直径为 17 mm 的样品，通过实验研究了保温对能耗的影响。使用有限元方法对直径为 17 毫米、50 毫米和 150 毫米的样品中的温度分布进行建模。驻留期间消耗的功率几乎是使用模具壁绝缘时的值的一半。模具面的额外绝缘和 CFRC 垫片的应用使钢粉烧结过程中的功率降低了三倍，而氧化锆粉末烧结过程中的功率降低了五倍。先进的隔热层显着地使中小型样品内的温度分布均匀。先进的绝热技术大大降低了直径为 150 毫米的大型导电样品内部的温度梯度。然而，绝缘材料显然不能确保这种直径的非导电部件内可接受的温度均匀性。其原因是样品边缘附近的特定电流路径和相关热量集中。