Ball-milling vibrating

The particle shape and size of the raw and ground powder samples of Sm2Fe17Ny (y 3) are shown in Figure 10.9. Ball-milling in solvents easily produces fine powder materials with smaller amounts of strain than materials obtained by solution-free ball-milling, vibrating milling, and jet... 

Impact breakers Ring ball mills Vibration and vibro- ... 

Hammer mills, jaw crushers, ball mills Vibrating screens... 

Hard and tough Mica Scrap and powdered metals Jaw crushers Gyratory crushers Cone crushers Autogeneous mills Ball, pebble, rod and cone mills Tube mills Vibration mills Ball, pebble and cone mills Tube mills Vibration and vibro-energy mills Fluid-energy mills Moh s hardness 5-10, but includes other tough materials of lower hardness... 

All ball, pebble, rod and cone mills, edge runner mills, tube mills, vibration mills and some ring ball mills may be used wet or dry except where stated. The perl mills, sand mills and colloid mills may be used for wet milling only. 

If an analyte is definitely insoluble or only soluble in solvents that are not acceptable for the standard MALDI sample preparation technique, it can alternatively be ground together with the solid matrix, preferably in a vibrating ball mill. The resulting fine powder is then spread onto the target. To avoid contamination, nonadherent material should be gently blown away from the target before insertion into the ion source. [103,108,109]... 

There are other advantages of employing magnetic ball mills besides the control of mechanical milling modes. Since the centrifugal force becomes a secondary factor in milling, and the reactor shell rotates at low RPM, contamination from balls and shell wear is lower than in a vibrational or a planetary mill there is less ball wear involved and contaminations with Fe from steel become less of the problem. Also lower rotations and uniaxial movement of reactors paced on horizontal axle allow... 

The pellet (pressed-disk) technique depends on the fact that dry, powdered potassium bromide (or other alkali metal halides) can be compacted under pressure in vacuo to form transparent disks. The sample (0.5-1.0 mg) is intimately mixed with approximately 100 mg of dry, powdered KBr. Mixing can be effected by thorough grinding in a smooth agate mortar or, more efficiently, with a small vibrating ball mill, or by lyophili-... 

In order to obtain absolute measurements of spin concentrations, a series of standards was made up, which consisted of known weights of diphenyl-picrylhydrazyl (DDPH) diluted with potassium chloride (the mixtures were mended in a vibrating ball mill). A suitable standard was run immediately after each unknown at identical settings of instrument gain so that recorder traces of standard and unknown could be directly compared. 

SiC-coated or uncoated MWCNTs are dispersed in isopropylalcohol (IPA) using ultrasonic vibration for 5 min. Then the SiC-coated or uncoated MWCNTs are mixed with fine WC and cobalt powders (10 wt% cobalt) in IPA using plastic balls (10-20 mm in diameter) for 5 h. After ball milling, the IPA solution is evaporated by stirring using an electric heater and then dried at... 

The activation can be carried out by the chemical technique (with various reagents), the physical technique (with ultrasound with inert gas used to disperse liquid aluminum) or the mechanical technique (fine dispersion in a cavity, ball or vibration mill). 

Activation of aluminum in a cavity, ball or vibration mill. This activation technique should be used in nitrogen and in 5% solution of triethylaluminum in n-heptane, because aluminum suspension is easily transported through pipes and activated aluminum is protected from oxidation (with oxygen in air) during transportation and storage. Besides, wet grinding is less explosive than dry. Aluminum powder should be activated in the mill for 20-30 hours. The aluminum ground in a vibration mill is the most active. 

The pellet (pressed-disk) technique depends on the fact that dry, powdered potassium bromide (or other alkali metal halides) can be compacted under pressure to form transparent disks. The sample (0.5-1.0 mg) is intimately mixed with approximately 100 mg of dry, powdered KBr. Mixing can be effected by thorough grinding in a smooth agate mortar or, more efficiently, with a small vibrating ball mill, or by lyophilization. The mixture is pressed with special dies under a pressure of 10,000-15,000 psi into a transparent disk. The quality of the spectrum depends on the intimacy of mixing and the reduction of the suspended particles to 2 gm or less. Microdisks, 0.5-1.5 mm in diameter, can be used with a beam condenser. The microdisk technique permits examination of samples as small as 1 fxg. Bands near 3448 and 1639 cm-1, resulting from moisture, frequently appear in spectra obtained by the pressed-disk technique. 

A typical task is the milling of minerals in the pm-range with power consumption of approximately 50 Wh kg-1. A tumbling ball mill would need 1 hour of milling time at a specific power input of 50 W kg-1 for the comminution, a stirred media mill would need 2 min at 1400 W kg-1, a vibration mill 40 s at 4500 W kg-1, and a planetary mill 5 s at 36,000 W kg-1 (Fig. 14.4). 

---