High Pressure / High Temperature Sintering of Polycrystalline Diamond with Different Binders

Reference	Presenter	Authors (Institution)	Abstract
12-002	Mariana Chianca Lúcio Silva	Silva, M.C.(Universidade Federal do Rio Grande do Norte); Karimi, M.M.(Federal University of Rio Grande do Norte); Gomes, U.U.(Universidade Federal do Rio Grande do Norte); Filgueira, M.(UENF);	The primary objective of the presented work is to study the sinterability of polycrystalline diamond (PCD) particles under high pressure high temperature (HPHT) sintering using different metallic binders. For this reason two different binders was prepared and being used to sinter diamond powder under HPHT condition. Binders were pure niobium (Nb) and a mixture of niobium with cobalt (Co) and 10 wt% of binder was used. The mixed diamond and binder powders were capsulated and sintering was carried out at 1750°C under 7.7 GPa of pressure. Two different holding times of 3 minutes and 9 minutes (three successive 3 minutes) were used. Obtained samples were studies according to relative density and hardness. Microstructural / structural studies were done via XRD and SEM/EDS to find any graphitization and microstructure evaluations during sintering. The results showed that diamond sintered body with niobium binder have higher hardness and better structural condition especially by avoiding graphitization during sintering and having lower difference between thermal expansion coefficients.
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