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Cold sintering process (CSP) has at
Cold sintering process (CSP) has attracted great interest due to its extremely low processing temperatures, fast processing times, and simplicity to allow for the densification of ceramics and composites. Understanding the detailed mechanisms underlying low temperature densification is crucial to develop advanced materials and facilitate sustainable and cost-effective industrial implementation to come. Here, by taking BaTiO3 powder and Sr(OH)2·8H2O transient chemical flux as a model system, chemical transformation at solid/flux interfaces driving the dissolution-precipitation creep mechanism were investigated. We demonstrate that Sr(OH)2·8H2O acts both as a sintering flux and a solid solution doping additive, resulting in the formation of BaTiO3 - Ba1-xSrxTiO3 with lower Curie temperatures. Using strontium (Sr) as a tracer chemistry, transmission electron microscopy chemical mapping with energy-dispersive X-ray analysis indicates that there is a precipitation of a Ba1-xSrxTiO3 mainly at grain/grain interfaces, while grain cores remain undoped. In addition, the difference in the interfacial Sr concentration, which is influenced by the applied uniaxial pressure direction, was clearly observed. This successful visualization of compositional distribution after CSP underlines the significant role of the pressure solution creep in densification process.
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冷烧结工艺（CSP）由于其极低的加工温度，快速的加工时间以及简化陶瓷和复合材料的致密性而引起了人们的极大兴趣。了解低温致密化的详细机制对于开发先进材料和促进可持续且具有成本效益的工业实施至关重要。在此，以BaTiO3粉末和Sr（OH）2·8H2O瞬态化学通量为模型系统，研究了固溶通量界面上的化学转化驱动溶解-沉淀蠕变机理。我们证明Sr（OH）2·8H2O既充当烧结助熔剂，又充当固溶体掺杂添加剂，从而导致居里温度较低的BaTiO3-Ba1-xSrxTiO3的形成。使用锶（Sr）作为示踪剂化学物质，能量色散X射线分析的透射电子显微镜化学作图表明，Ba1-xSrxTiO3主要在晶粒/晶粒界面处析出，而晶粒核保持未掺杂状态。另外，清楚地观察到界面Sr浓度的差异，该差异受所施加的单轴压力方向的影响。CSP后这种成分分布的成功可视化强调了压力溶液蠕变在致密化过程中的重要作用。清楚地观察到。CSP后这种成分分布的成功可视化强调了压力溶液蠕变在致密化过程中的重要作用。清楚地观察到。CSP后这种成分分布的成功可视化强调了压力溶液蠕变在致密化过程中的重要作用。
正在翻译中..
Cold sintering process (CSP) has attracted great interest due to its extremely low processing temperatures, fast processing times, and simplicity to allow for the densification of ceramics and composites. Understanding the detailed mechanisms underlying low temperature densification is crucial to develop advanced materials and facilitate sustainable and cost-effective industrial implementation to come. Here, by taking BaTiO3 powder and Sr(OH)2·8H2O transient chemical flux as a model system, chemical transformation at solid/flux interfaces driving the dissolution-precipitation creep mechanism were investigated. We demonstrate that Sr(OH)2·8H2O acts both as a sintering flux and a solid solution doping additive, resulting in the formation of BaTiO3 - Ba1-xSrxTiO3 with lower Curie temperatures. Using strontium (Sr) as a tracer chemistry, transmission electron microscopy chemical mapping with energy-dispersive X-ray analysis indicates that there is a precipitation of a Ba1-xSrxTiO3 mainly at grain/grain interfaces, while grain cores remain undoped. In addition, the difference in the interfacial Sr concentration, which is influenced by the applied uniaxial pressure direction, was clearly observed. This successful visualization of compositional distribution after CSP underlines the significant role of the pressure solution creep in densification process.
正在翻译中..
冷烧结工艺（CSP）以其极低的加工温度、快速的加工速度、易于陶瓷和复合材料的致密化而受到人们的广泛关注。了解低温致密化的详细机理对于开发先进材料和促进未来可持续和经济高效的工业实施至关重要。本文以BaTiO3粉体和Sr（OH）2·8H2O瞬态化学通量为模型体系，研究了固体/熔剂界面的化学转变驱动溶解-沉淀-蠕变机理。结果表明，Sr（OH）2·8H2O既是烧结助焊剂，又是固溶体掺杂添加剂，形成了居里温度较低的BaTiO3-Ba1-xSrxTiO3。以锶（Sr）为示踪剂，用能谱X射线分析的透射电镜化学填图表明，Ba1-xSrxTiO3主要在晶粒/晶粒界面处析出，而晶核未掺杂。此外，还观察到了界面Sr浓度的差异，这种差异受单轴压力方向的影响。这一成功的CSP后成分分布的可视化强调了压溶蠕变在致密化过程中的重要作用。<br>
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