Sealed cobalt removal device, method, assembly equipment, and polycrystalline diamond compact

A sealed cobalt removal device, comprising:

• an enclosing mechanism;
• a clamping mechanism, wherein the clamping mechanism is provided in the enclosing mechanism, the clamping mechanism is configured to clamp a workpiece to be subjected to cobalt removal;
• and the workpiece to be subjected to cobalt removal comprises a substrate and a composite layer connected to a top of the substrate;
• a composite sealing ring, wherein the composite sealing ring is embedded in a top of the clamping mechanism, and the composite sealing ring is sleeved around the workpiece to be subjected to cobalt removal, the composite sealing ring comprises a first sealing body and a second sealing body embedded in an inner side wall of the first sealing body, and the second sealing body is sleeved around an outer wall of the composite layer or at a junction between the composite layer and the substrate, the first sealing body is configured to block cobalt removal reagent, and a material of the second sealing body is a material that is capable of reacting or not reacting with the cobalt removal reagent;
• and
• a containing mechanism, wherein the containing mechanism is provided in the enclosing mechanism, a bottom of the containing mechanism is pressed tightly against a top surface of the first sealing body, the containing mechanism is provided with an inner cavity for containing the cobalt removal reagent, and the inner cavity is communicated with a top surface of the composite layer.