Solid-state reactions during high-energy milling of mixed powders
Solid-state reactions during high-energy milling of mixed powders
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DOI：
10.1016/j.actamat.2012.09.061
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发表时间：
2013-01
期刊：
影响因子：
9.4
通讯作者：
J. Trapp;Bernd Kieback
中科院分区：
文献类型：
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作者：
J. Trapp;Bernd Kieback
在高能球磨过程中的碳化物和硼化物相的形成进行了研究，通过测量小瓶内的气体温度和X射线衍射研究的试样在不同阶段的研磨过程。随着球磨强度和产物生成焓的增加，产物的生成机理从渐进过程转变为瞬时的爆炸式反应。最后，开发了一个模型来描述研磨过程，并确定在球碰撞过程中达到的粉末颗粒的峰值温度以及微观结构的演变。使用有效的扩散系数和计算的不断增长的扩散层的演变，它是可能的，以确定是否和何时发生快速相形成。该模型进行了测试，通过复制所需的研磨时间内的磨机快速相形成。
The phase formation of carbides and borides during high-energy ball milling has been investigated by measuring the gas temperature inside the vial and by X-ray diffraction studies of specimens taken at different stages of the milling process. The formation mechanism changes from a gradual process to an instantaneous, explosion-like reaction with increasing milling intensity and enthalpy of product formation. Finally, a model was developed to describe the milling process, and to determine the peak temperatures that are reached in the powder particles during ball collisions as well as the microstructure evolution. Using an effective coefficient of diffusion and calculating the evolution of the continuously growing diffusion layer, it was possible to determine whether and when rapid phase formation occurs. The model was tested by reproducing the milling times needed for rapid phase formation inside the mill.