High capacitance tantalum flakes and methods of producing the same
A technology of permittivity and sheet thickness, applied in the field of high capacitance tantalum sheet and its preparation, tantalum flake powder
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Embodiment 1
[0059] In order to obtain a tighter flake thickness distribution and a lower average flake thickness, various samples were prepared using the standard starting material Kdel tantalum powder, which is a basic lot powder (basic lotpowder) that has undergone sodium reduction and acid leaching. Used to make C275Ta pellets from Cabot Corporation. 5 lbs of Kdel tantalum was slowly added to a 1S attritor mill with 50 lbs of 3 / 16" stainless steel media and 2700 ml of ethanol. After 2 hours of grinding at 250 rpm, the powder was removed from the mill. After the stainless steel media replaced the 3 / 16" media, the grinder was loaded with 2700ml of fresh ethanol and 2.5 lbs of powder ground from the 3 / 16". After milling at 250 rpm for 6 hours, the flakes were then removed and rinsed with DI water. The flakes are then subjected to acid leaching to remove surface contamination accumulated during grinding. Analyze the Scott density and chemical composition of the flake samples.
[0060] T...
Embodiment 2
[0064] C275 tantalum flakes commercially available from Cabot Corporation were compared with tantalum flakes prepared by multi-stage milling. In an embodiment, flakes of the present invention were prepared using a 2-stage milling process. 5 lbs of Kdel tantalum base batch powder, standard starting material for C275 Cabot flakes, were milled in a 1S attritor mill using 3 / 16 inch media at 250 rpm for 2 hours (first stage). Then, 2.5 lbs of ground material was ground for an additional 6 hours in the same grinder using 1 / 8 inch media (second stage). Then, the 2-stage milled flake samples were subjected to acid leaching and drying. Next, the flake samples were hydrogenated to a hydrogen content of 4000 ppm and ground in a Vortec mill to reduce the Scott density from about 4-5 g / in 3 Increase to about 20-25g / inch 3 . The samples were then processed using the standard C275 process with adjusted heat treatment temperatures of 1200°C and 1300°C for the first heat treatment and the ...
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