Milling intensity

J. Eckert, L. Schlutz, E. HeUstem, K. Urban, Glass forming range in mechanically alloyed NiZr and the influence of the milling intensity, J. Appl. Physics 64 (1988) 3224. 

Fig. 3.39. X -ray diffraction patterns of Al65Cu20Mn15 after different milling times at milling intensity 7...

Scanning electron micrograph of an AI,sC u, Mn,, powder particle milled lor 70 It at milling intensity 7... 

Hi - 3.41. Selected area diffraction pattern of AI(,5Cu2 Mn15 powder milled for 100 h at milling intensity 7. Three different exposure times (increasing clockwise) were used for a better identification of weak intensity details. All Debye Seherrer rings can be indexed in ieosahedral notation, e g., (a) (100 000), (h)(l 10 000). (e) (I 1 I 000), and (d) (101 000)... 

Influence of the Milling Intensity - Milling-Induced Phase Transitions... 

The above listed characteristics depend on many primary particle properties and operation conditions, such as the nature of the material (brittle or soft), particle size, kind of loading in the mill, intensity and velocity of loading, the shape and hardness of the loading surfaces and the environmental conditions, namely temperature. 

COLLOID MILLS. In a colloid mill, intense fluid shear in a high-velocity stream is used to disperse particles or liquid droplets to form a stable suspension or emulsion. The final size of the particles or droplets is usually less than 5 /rm. Often there is little actual size reduction in the mill the principal action is the disruption of lightly bonded clusters or agglomerates. Syrups, milk, purees, ointments, paints, and greases are typical products processed in this way. Chemical additives are often useful for stablizing the dispersion. 

It seems that the milling intensity (power injected) is the characteristic milling parameter that defines final (steady-state) phase induced by milling, so it has been suggested, that it should be quoted whenever possible in order to compare diverse investigations [73]. 

FIGURE 17.4 Milling intensity (power injected) of planetary ball mill as a function of ball number and rotation speed (a) vial volume 500 ml, balls diameter 13.4 mm (b) vial volume 220 ml, balls diameter 8 mm. 

The influence of milling intensity (Equation (17.6)) as well as additives (grinding environment) that is, liquids of various polarity (water, methanol, or toluene) on the contamination of quartz by iron during the course of milling in vibratory ball mill was investigated in detail [72]. Important result derived is that, neither the milling intensity nor milling time influences iron contamination... 

Structure must be degraded to some extent prior to enzyme treatment by vibratory ball milling for 3 h and, thus, neither this lignin can be regarded as completely native although the milling intensity has been greatly reduced. 

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