The Research On Sythesis Technology And Performance Testing And Analysis Of 13-13 PDC Using Small Hydraulic Press Machine

Polycrystalline Diamond Compacts (PDC) is a type of super-hard composite ,which takes diamond powder as raw material, WC cemented carbide as matrix, is sintered through special synthesis technology under high pressure and high temperature. Compact has both advantages of Good hardness, good wearing performance in diamond, and excellent impact resistance in cemented carbide. nowadays the compact's application in deep welldrilling extends to all fields of deposit exploration and machining, and gradually replace single crystal diamond as the most important member of superhard material. However, the whole home high pressure and high temperature equipments which are used in synthesizing compacts are changed from single crystal diamond synthesis equipment, and cavity diameter of this hydraulic press machine is below 400mm.Therefore small-scale PDC can only be synthesized.But metals or alloys in small-scale PDC can't be wetted and bonded effectively with diamond particles, and the interface bonding is weak, which limit its range of application. So studies on synthesis mechanism and interface bonding problem of synthesizing large-scale compact by using small cavity hydraulic press machine is of special importance.In this paper, studies begin with the analysis on the problem of interface between Polycrystalline Diamond and metal matrix and its bonding mechanism. Then optimization for synthesis technology and design for composition component of Polycrystalline Diamond composites are conducted, it is first time in domestic to apply 6×8MN hinge six-side top hydraulic press machine to synthesizingφ13-13 diamond compacts. At the same time, SEM, FRS analysis methods are employed, and the main studies are listed as follows:1. Using six-side top hydraulic press machine, PDCφ13-13 is synthesized in high temperature and high pressure. Synthesis mechanism and process are described in detail in this study.2. The wearing performance; impact resistance, heat shock of the synthetic compact is tested and analyzed. Employing scanning electronic microscopy and Laser Raman spectrum, microstructure and element distribution of synthetic polycrystalline diamond-cemented carbide compact are observed. Combining with existing sintering technology, the further research direction was confirmed.3. Residual thermal stress in polycrystalline diamond-cemented carbide compact is analyzed with the finite element method, and we perform calculations by finite element software ANSYS. The distribution of residual thermal stress in all directions of the compacts is obtained. And the results provide an effective reference for synthesized high-quality compact.Through our performance testing and microstructure observation on the synthetic compactφ13-13 , the various performances meet application standard of the compacts which are used in oil drilling, and provide a new application direction for small cavity hydraulic press machine.