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Effect of the liquid fragility on flash sintering behavior of oxide nanoparticles
Scripta Materialia ( IF 6 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.scriptamat.2019.11.046
Rachman Chaim

Abstract Transient liquid-film formed at the nanoparticle contacts due to the local Joule heating, assists the ultrafast densification of oxide nanopowders by capillarity during flash sintering. The retention of this liquid-film as a residual intergranular amorphous layer or its crystallization depends on the fragility of the liquid-film, hence on its composition. Impurities concentrated at the particle surfaces and grain boundaries modify the flash temperature by affecting the electrical conductivity and viscosity of this liquid-film. These aspects were discussed for flash sintering of pure and doped aluminas as examples from the literature, where doping changed the flash onset temperatures and densification behavior.

中文翻译:

液体脆性对氧化物纳米颗粒闪烧行为的影响

摘要 由于局部焦耳加热,在纳米颗粒接触处形成的瞬态液膜有助于在快速烧结过程中通过毛细管作用实现氧化物纳米粉末的超快致密化。该液膜作为残余晶间无定形层的保留或其结晶取决于液膜的脆性,因此取决于其组成。集中在颗粒表面和晶界的杂质通过影响该液膜的电导率和粘度来改变闪蒸温度。作为文献中的示例,针对纯氧化铝和掺杂氧化铝的闪蒸烧结讨论了这些方面,其中掺杂改变了闪蒸开始温度和致密化行为。
更新日期:2020-03-01
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