Free-standing non-planar polycrystalline synthetic diamond components

A free-standing non-planar polycrystalline synthetic diamond component, preferably a loudspeaker diaphragm, is manufactured by a CVD process. The component comprises a nucleation face and a growth face, the nucleation face comprising smaller grains than the growth face and the nucleation face having...

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Bibliographische Detailangaben
Hauptverfasser:	CHRISTOPHER JOHN HOWARD WORT, STEPHANIE LIGGINS, PAUL NICOLAS INGLIS, MARK ROBIN MCCLYMONT, NEIL PERKINS, JOHN ROBERT BRANDON
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DEAF-AID SETS DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS METALLURGY PUBLIC ADDRESS SYSTEMS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	A free-standing non-planar polycrystalline synthetic diamond component, preferably a loudspeaker diaphragm, is manufactured by a CVD process. The component comprises a nucleation face and a growth face, the nucleation face comprising smaller grains than the growth face and the nucleation face having a surface roughness Ra no more than 50 nm. The component has a longest linear dimension when projected onto a plane of no less than 5 mm and is substantially crack free over at least a central region thereof, wherein the central region is at least 70% of a total area of the free-standing non-planar polycrystalline CVD synthetic diamond component, wherein the central region has no cracks which intersect both external major faces of the free-standing non-planar polycrystalline CVD synthetic diamond component and extend greater than 2 mm in length. Conditions for the CVD process are set out in the description.