Method for preparing multifunctional polycrystalline diamond compact

The invention relates to a method for preparing a multifunctional polycrystalline diamond compact. The nanocatalysis and high-pressure and high-temperature gradient synthesis technology is adopted, each particle size composition of the raw diamond and the catalyzing and synthesizing process are adjusted, the microstructure and the composition of the polycrystalline diamond compact (PDC) are controlled, the functions of the PDC are controlled and optimized, and the PDC is further finely divided into an anti-shock type, an anti-wear type and a high-temperature resistance type in property to obtain three functional PDCs, thereby finely dividing the functions of the traditional market products and satisfying the functional requirements of the drilling tool cutting teeth on different working conditions and geological microenvironments. The strata adaptability and the performance-price ratio of the drill bit can be obviously enhanced, the drilling efficiency and the service life of the drill bit are reasonably balanced, the PDC property can be fully exerted, and the resource of hard alloy is saved.