英国Freeman Technology开发出一种粉体流变测定仪FT4的最新工作模式，该仪器是基于粉体流动过程中的磨檫阻力与粉体的表面特征有关，开发出的一种快速测定多种粉体在传输过程中与器壁磨檫参数的粉体流变测定仪。测定出的磨檫参数对粉体材料的使用过程中的传输有重要的指导意义。
New Module Announced for FT4 Powder Rheometer
Freeman Technology (Malvern, Worcs, England) says that a new module for its FT4 Powder Rheometer allows fast, fully automated measurement of wall friction using standard or custom materials in contact with powders under test. This new module further extends the capabilities of the FT4, a system that Freeman says is rapidly becoming a universal powder tester.
Wall friction is an important consideration both in the design of processing plant and in predicting how a powder will process in a given plant. In all processing machinery, powder is required to flow within containing surfaces such as hoppers, chutes and pipes.
The frictional resistance between a given surface and the powder moving over it can be important in determining the smoothness or consistency of the powder transfer process. This frictional resistance depends on the powder characteristics, the material from which the surface is made, its finish and any surface treatments.
The FT4's new wall friction module allows experimental measurement of frictional resistance with a total test time of around 10 minutes. A 48mm diameter disc of the appropriate material and finish is used to compress a powder sample through a step sequence of predetermined normal stresses. At the same time, the disc is rotated and the shear stress is determined from measurements of the frictional torque at each stress level. The wall coefficient of friction is then calculated from the slope of the shear stress versus normal stress data.
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