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 CVD-DIA is a poly-cristalline diamond substrate with a thickness of 0.5 mm. However in contrast with the traditional PCD materials on the market, it does not contain any metallic binder phase. In a special CVD thick layer process, minute diamond crystals are separated and joined together. Thus a tight non-porous polymer diamond substrate is created. The standard height is between 0.5-0.6 mm, in other words, identical to the thickness of the well-known sintered or pressed PCD.
CVD-DIA is superior in performance to the familiar PCD. Compared with PCD, this material is not only harder and stiffer, but it even has a lower friction coefficient and is two to ten times more resistant to abrasion.
CVD-DIA has a higher heat conductivity and features a more favourable chemical and thermal stability. Its characteristics are very similar to the single crystal diamond. This is the only source of its disadvantage compared with the PCD: the fracture toughness is lower. CVD-DIA is thus a material, which like diamond at high speeds can provide the users with benefits compared to PCD.
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PROCESSING EXAMPLES
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TASK
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MATERIAL
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Turning/dry
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Graphite
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Turning/dry
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Glass fibre pipe
30% quarz fibre
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Turning
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Beryllia
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Turning pistons
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Aluminum A390
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Turning cams
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Aluminum M132
SI 12%
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Turning/exterior
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non-ferrous
metals
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Fräsen
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Wood
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Turning/interior
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Gold alloys
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Turning/milling
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Plastics
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CVD-DIA had to prove its unique performance reserves in all border areas of PCD tools in a 12-month test phase to gain a place in the Mößner GmbH product selection as a link between PCD and DIAMOND.
CVD-DIA directly compared with PCD resulted in a tool life three to five times as high in the application examples listed in the table. In all tests it attained just as good if not better surface finishes, which were sometimes even achieved at double feed.
CVD-DIA is the material of the future when it comes to mass production, processing abrasive non-ferrous materials and producing parts with utmost precision.
CVD-DIA tools have been designed with a variety of insert sizes, which can be re-cut. As a result, with correct use and taking the reasonably priced re-cutting costs into account, tool cost per unit can be greatly reduced in the mid term. |
