Method for prolonging endurance life of diamond compact and diamond compact

Abstract

The invention relates to the technical field of super-hard composite materials, in particular to a method for prolonging the endurance life of a diamond compact and the diamond compact. The method forprolonging the endurance life of the diamond compact includes the steps: irradiating an interface between a substrate and a diamond layer and the surface of the diamond layer by ultra-fast pulse laser beams; polishing the surface of the diamond layer. The diamond compact is manufactured by the ultra-fast pulse laser beams, a gradient transition layer is generated between layers, so that the substrate and the diamond layer are firmly combined, and sudden change of a thermal quantity and a mechanical quantity on the interlayer interface is avoided. The surface (cold annealing) of the diamond layer is irradiated by the ultra-fast pulse laser beams, thermal stress concentration and lattice defects of the diamond layer can be eliminated, D-D bonds on the surface of the diamond layer can be firmly bonded, cobalt atoms are 'extruded' to the surface of the diamond layer, a rich cobalt layer is removed by polishing, ultra-high surface smoothness is realized, the high-temperature resistance ofthe diamond compact is improved, and the service life of the diamond compact is prolonged.

Description

technical field [0001] The invention relates to the technical field of superhard composite materials, in particular to a method for improving the service life of a diamond composite sheet and the diamond composite sheet. Background technique [0002] At present, metal cobalt (Co) and the like are used as binders in the manufacture of diamond compacts in the world. The diamond compacts in the prior art are such as figure 1 As shown, a substrate 1 and a diamond layer 2 containing a Co binder are included. Since the thermal expansion coefficient of Co is larger than that of diamond particles, at 700-760°C, the expansion of Co will cause the bond between diamond particles to separate, which will seriously reduce the wear resistance of diamond, so acid corrosion is usually used to make Co is precipitated from between diamond particles, and its corrosion depth can reach about 0.1-0.5mm. This method of removing Co can restore the wear resistance of diamond to a certain extent, but...

AI Technical Summary

Problems solved by technology

Since the thermal expansion coefficient of Co is larger than that of diamond particles, at 700-760°C, the expansion of Co will cause the bond between diamond particles to separate, which will seriously reduce the wear resistance of diamond, so acid corrosion is usually used to make Co is precipitated from between diamond particles, and its corrosion depth can reach about 0.1-0.5mm. This method of removing Co can restore the wear resistance of diamond to a certain extent, but it will make the diamond layer appear more pores, thereby reducing the wear resistance of diamond. Mechanical structure strength and service life of diamond composite sheet

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