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                                   Table 2 PVD Coating Materials and Their Characteristics





               6.9 CVD coating

               A CVD coating is a material applied to a surface by a method called chemical vapor deposition. CVD
               coatings are prevalent throughout industry and can be found in many consumer products.  They're
               known as being an environmentally friendly durable thin film surface.


                      Process description
               Chemical vapor  deposition  is  a  process  that  involves  the  reaction of  a volatile  precursor which  is
               injected into a chamber (typically under vacuum).  The chamber is heated to a reaction temperature
               that causes the precursor gas to react or break down into the desired coating and bond to the material
               surface.  Over time the coating material builds on the surface and creates a coating throughout the
               exposed part's surface (Fig. 6. 17,Fig. 6. 18, Fig. 6. 19).
























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                                      Fig. 6. 17 Chemical vapor deposition process scheme







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