5 u03bcm diameter ceralox hpa and 135 g y 2 o 3 10 1 u03bcm diameter research chemicals were added with the mill at 600 1000 rpm 30 g of polyvinylpyrrolidone pvp 15 a trademark of gaf corp and 25 ml of ammonium polyacrylate darvan 821a a trademark of r t vanderbilt were also added as dispersants the slurry contained 49 volume solids and was turbomilled at 1500 rpm for 2 hour the slurry was very fluid with a viscosity less than 50 cp example 3 920 g si 2 n 4 powder 0 1 u03bcm diameter stark lc 12sx 20 g al 2 o 3 0 5 u03bcm diameter ceralox hpa and 60g y 2 o 3 1 u03bcm diameter 5600 a trademark of molycorp inc were added to the turbomill 10 cm diameter containing 528 ml water 15 ml ammonium polyacrylate darvan 821a a trademark of r t vanderbilt 15 g polyvinyl alcohol polyscience 25k a trademark of polysciences inc and 2 kg of zirconia mill media u02dc 3 mm diameter at u02dc 1000 rpm the mixture was turbomilled for u02dc 1 hour at 1000 1400 rpm 460 g si 3 u03bcm diameter elkem hq were added with the mill at 600 1000 rpm the slurry contained 49 volume solids and was turbomilled at 1200 rpm for 0 5 hour the slurry was very fluid with a viscosity lt 50 cp example 4 the same quantities of powders and water as in example 1 were added to a conventional ball mill and tumbled at u02dc 60 rpm for 4 hours at higher rpm no milling action occurs because the media is held against the mill.