Reaction milling

L. Takacs, Nanocomposite Formation and Combustion Induced by Reaction Milling, Mater. Res. Soc. Symp. Proc., 1993, 286,413. 

A mode of mechanical alloying is reaction milling, developed for dispersion strengthened aluminum production [1], To produce aluminum dispersoid the aluminum powder is intensively dry milled with carbon powder. The transformed dispersed phase A14C3 is than produced by a chemical reaction, which starts during milling, and it is completed at the next heat treatment process. The resulting powder mixture is then pressed,... 

Expressions can also be derived (Ramachandran and Chaudhari, 1983) for the case where the liquid-phase reactant concentration [B]b does not remain constant, that is, diffusion of both A and B is limiting, and the reaction is second order. This case is also included in Table 17.2, along with the conditions for B limiting. It is a relatively straightforward matter to extend the equation to the general case of an mth order reaction (Mills and Chaudhari, 1997). The general expression for the reaction is then (-r ) =... 

Figure 8.1.23 depicts the ultrasound enhancement factor Eus as a function of the surface activation degree with parameter f2. The circles represent measured values for Eus and . In the case of magnesium as the treated sohd with tetrahy-drofurane as solvent and different chlorobutanes as reactants a mechanical activation degree of approximately 10% has been observed. This means that 10% of the necessary activation energy has been delivered by the mechanical treatment by impinging liquid microjets. This is a typical value that can be found in other devices like reaction mills, too. This value of 4 to 6kJ/mol for mechanically treated... 

Dallimore, M.P., and McCormick, P.G., Dynamics of planetary ball milling a comparison of computer simulated processing parameters with CuO/Ni displacement reaction milling kinetics. Mater. Trans. JIM, 37 (5), 1091-1098, 19%. 

Yang, H. and McCormick, P.G. (1993) Reduction of tantalum chloride by magnesium during reaction milling. Journal of Materials Sciences, 12, 1088-91. 

---