Preparation method for polycrystalline diamond compacts with uniform microstructures and product

The invention belongs to the technical field of ultrahard composite materials, and in particular, relates to a preparation method for polycrystalline diamond compacts with uniform microstructures anda product. The method comprises the step of high-temperature and high-pressure sintering after assembly of diamond micropowder and catalysts in hard alloy basal bodies; the step of high-temperature and high-pressure sintering comprises at least two phases of high-temperature and high-pressure sintering performed in sequence; and the temperature in each high-temperature and high-pressure sinteringis gradually increased, and the pressure is the same or gradually increased. Through implementation of multiple times of high-temperature and high-pressure sintering in sequence, the problem of localagglomeration formed by spraying infiltration of interface catalysts of polycrystalline diamond compacts is solved, so that the heat stability and the impact resistance of the compacts are greatly improved, and the collapse and