Abstract
ABSTRACT A new method had been developed for the synthesis of a triphasic WC/Co/diamond nanocomposite, comprising a high volume fraction of diamond in a WC/Co matrix. Starting with available nanophase WC/Co powder, the new process involves: (1) partial sintering of a WC/Co powder compact to develop a porous preform, (2) chemical vapor infiltration (CVI) of the porous preform with amorphous or graphitic carbon, and (3) high pressure/high temperature (HPHT) consolidation of the carbon-infiltrated WC/Co preform to develop a fully-dense WC/Co/diamond nanocomposite. In the critical CVI step of the process, the kinetics of the carbon deposition may be controlled to develop either an uniform or graded distribution throughout the porous WC/Co preform. A functionally-graded triphasic superhard material, comprising a nanophase WC/Co core and a diamond-enriched surface, should combine high strength and toughness with superior wear resistance.
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