Synthetic block of large-diameter polycrystalline diamond compact

The utility model provides a synthetic block of a large-diameter polycrystalline diamond compact, which comprises a first heating element (5), a cavity (10) for synthesizing the polycrystalline diamond compact is arranged in the first heating element (5), and a second heating element (3) is locally arranged at the center of at least one axial end of the cavity (10). When the synthetic block is used for synthesizing the large-diameter polycrystalline diamond compact, the second heating piece continuously heats the area with the lower radial temperature of the diamond compact, so that the temperature field is more uniform, and the defects of layering, cracking and the like of a synthesized product can be reduced. 本实用新型提供了一种大直径聚晶金刚石复合片的合成块，包括第一发热件(5)，所述第一发热件(5)内部设有用于聚晶金刚石复合片合成的腔体(10)，在所述腔体(10)轴向至少一端的中心局部设有第二发热件(3)。该合成块在合成大直径聚晶金刚石复合片时，第二发热件对金刚石复合片径向温度较低区域持续加热，使温度场更均匀，可以减少合成后的产品分层、开裂等缺陷。