Abstract
A new method of processing functionally graded WC/Co/diamond nanocomposites has been developed. The starting particle size of WC grains is ∼100nm. The critical step in processing is the generation of pore size gradient using electrochemical etching of cobalt. This leads to the generation of larger pores on the surface. After etching; Pores are filled with carbon by chemical vapor infiltration; Using catalytic decomposition of methane. This carbon rich sample is then subjected to a high pressure/high temperature treatment to convert carbon into diamond. The resulting functionally graded nanocomposite contains higher amount of diamond on surface leading to higher wear resistance; And higher amount of WC/Co in the core leading to higher toughness.
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