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Truszkowski, Tomasz
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Properties of WCCo/diamond composites produced PPS method intended for drill bits for machining of building stones
Abstract
The paper presents the application of the pulse plasma sintering (PPS) method in the field of diamond composites sintered under the conditions of thermodynamic instability of diamond for the manufacture of tools intended for machining building stone. The WCCo/diamond composites containing 30 vol % of diamond particles were produced using a mixture of submicron WC6Co (wt %). Thanks to PPS densification conditions, dense sinters with a strong bond between the diamond particles and the sintered carbide matrix have been obtained. Examinations of the phase composition and observations of the microstructure did not show graphitization of diamond. The SEM photographs revealed transcrystalline fractures of the diamond particles. The presence of transcrystalline fractures of the diamond particles indicates that the bonding forces between the diamond particles and the WCCo matrix exceed the strength of the diamond particles. The paper compares the percent number of transcrystalline fractures of diamond particles in dependence on the densification parameters.