Conventional diamond burs used for grinding operations have a number of problems associated with heterogeneity of the crystallites, decreased cutting efficiency, need for repeated sterilisation and short life. These burs are manufactured by imbedding diamond particles into the burs using a suitable binder matrix material. Chemical vapour deposition of diamond coatings onto the cemented tungsten carbide WC–Co substrate is problematic. The adhesion of diamond coating to cemented carbide substrate is poor and the binder materials, such as cobalt, can suppress diamond growth and enhance graphitic deposits, which cause poor adhesion and low diamond nucleation density. Adhesion, lifetime and the performance has been enhanced by optimising surface treatments and process parameters.
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