DH> Adding a thin coating of a highly brittle substance over another
 DH> structure is not going to make that initial structure any more rigid
 DH> unless that second coating comprises a major part of the total assembly.
 DH> There *are* some major uses for the thin-film diamond coating but they
 DH> are totally centered on the advantages which diamond offers. They are
 DH> for low wear and temperature conduction.  I have not seen any commercial
 DH> use of diamond for resistance to bending.
 In a related transducer application, a famous extremely accurate
 brand of microphone has a line with diamond coating for
 stiffness on large diaphragm condensers.
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