The individual cyclones of the system were tested and calibrated in the laboratory under conditions similar to those frequently encountered in field tests: gas temperatures of 25, 93, and 204 °C, flow rates of 7.1, 14.2, and 28.3 L/min, and particle densities of 1.05, 1.35, and 2.04 g/cm3. The D5o's for the cyclone system at various operating conditions are given in Table IV. For laboratory test conditions the small cyclones have sharp collection efficiency curves, and thus the system should function adequately as a particle sizing device.Data from this study (wherein different particle densities, p, were used) tend to support the D50 vs. p-1/2 relationship suggested by several theories (4, 17, 18). On the other hand, the experimental results indicating that the D 5o's were directly proportional to the gas viscosity are in opposition to most theories (4, 5, 17, 18). Also, it was found in this study and others that the D;50's of small cyclones are not inversely proportional to the square root of the flow rate as some theories predict ( 7). It appears that establishment of a definitive relationship between D50 and flow rate will require further investigation. AcknowledgmentThe mechanical design was done by David Hussey and part of the experimental data were taken by Don Johnson.

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Magnesium-based bulk metallic glass matrix composites (BMGMCs) have better plasticity than the corresponding bulk metallic glasses (BMGs); however, their strength and density are often compromised due to the fact that the effective reinforcement phase is mostly plastic heavy metal. For lightweight SiC-particle reinforced BMGMCs, interface wettability and the sharpness of the particles often reduce the strengthening effect. In this work, SiC particles were coated with a thin Cu coating by electroless plating, and added to Mg54Cu26.5Ag8.5Gd11 melt in an amount of 5 wt % to prepare a BMGMC. The microstructure of the interface, mechanical behavior and fracture morphology of the BMGMC were studied by scanning electron microscopy and quasi-static compression testing. The results showed that the Cu coating improved the wettability between SiC and the matrix alloy without obvious interfacial reactions, leading to the dispersion of SiC particles in the matrix. The addition of Cu-coated SiC particles improved the plastic deformation ability of Mg54Cu26.5Ag8.5Gd11 BMG, proving that electroless plating was an effective method for controlling the interface microstructure and mechanical behavior of BMGMCs.