Deng Huaijiu, Biesuz Mattia, Vilémová Monika, Kermani Milad, Veverka Jakub, Tyrpekl Václav, Hu Chunfeng, Grasso Salvatore
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
Institute of Plasma Physics of the Czech Academy of Sciences, Za Slovankou 3, 182 00 Prague, Czech Republic.
Materials (Basel). 2021 Dec 12;14(24):7655. doi: 10.3390/ma14247655.
We report on an ultrarapid (6 s) consolidation of binder-less WC using a novel Ultrahigh temperature Flash Sintering (UFS) approach. The UFS technique bridges the gap between electric resistance sintering (≪1 s) and flash spark plasma sintering (20-60 s). Compared to the well-established spark plasma sintering, the proposed approach results in improved energy efficiency with massive energy and time savings while maintaining a comparable relative density (94.6%) and Vickers hardness of 2124 HV. The novelty of this work relies on (i) multiple steps current discharge profile to suit the rapid change of electrical conductivity experienced by the sintering powder, (ii) upgraded low thermal inertia CFC dies and (iii) ultra-high consolidation temperature approaching 2750 °C. Compared to SPS process, the UFS process is highly energy efficient (≈200 times faster and it consumes ≈95% less energy) and it holds the promise of energy efficient and ultrafast consolidation of several conductive refractory compounds.
我们报道了一种使用新型超高温快速烧结（UFS）方法对无粘结剂WC进行超快速（6秒）固结的情况。UFS技术填补了电阻烧结（≪1秒）和火花等离子体快速烧结（20 - 60秒）之间的差距。与成熟的火花等离子体烧结相比，所提出的方法在保持相当的相对密度（94.6%）和维氏硬度2124 HV的同时，提高了能源效率，节省了大量能源和时间。这项工作的新颖之处在于：（i）多步电流放电曲线以适应烧结粉末电导率的快速变化；（ii）升级的低热惯性CFC模具；（iii）接近2750°C的超高固结温度。与SPS工艺相比，UFS工艺具有很高的能源效率（快约200倍，能耗减少约95%），有望对几种导电耐火化合物进行节能和超快速固结。
