Surface-modified polycrystalline diamond and processing method thereof

Abstract

A surface-modified polycrystalline diamond and a processing method thereof are provided in the present disclosure. The polycrystalline diamond comprises a polycrystalline diamond body, holes are formed on the polycrystalline diamond body after a catalyst metal is removed, and the holes are embedded with a non-catalyst metal after the catalyst metal is removed therefrom. Thus, thermal damage and stress damage to the polycrystalline diamond during operations at a high temperature are eliminated, improving the thermal conductivity of the surface of the polycrystalline diamond, reducing the temperature of the area around the operating point of the polycrystalline diamond and, therefore, the service life of the polycrystalline diamond is prolonged.

1 . A surface-modified polycrystalline diamond, comprising a polycrystalline diamond body, wherein holes are formed on the polycrystalline diamond body after a catalyst metal is removed therefrom, and the holes are embedded with a non-catalyst metal. 
     
     
         2 . The surface-modified polycrystalline diamond of  claim 1 , wherein the non-catalyst metal is one of copper, silver, aluminum, and alloys thereof. 
     
     
         3 . The surface-modified polycrystalline diamond of  claim 1 , wherein each of the holes has a depth of 0.1 mm to 1 mm. 
     
     
         4 . A method of processing the surface-modified polycrystalline diamond of  claim 1 , comprising the following steps of:
 removing the catalyst metal from a surface of the polycrystalline diamond body and forming holes in the surface of the polycrystalline diamond body; and   embedding the non-catalyst metal into the holes.   
     
     
         5 . The method of processing the surface-modified polycrystalline diamond of  claim 4 , wherein the steps of removing the catalyst metal from the surface of the polycrystalline diamond body and forming the holes in the surface of the polycrystalline diamond body comprise:
 boiling the polycrystalline diamond body in an aqua regia for 20 to 60 hours; and   taking the polycrystalline diamond body out of the aqua regia and rinsing the polycrystalline diamond body until the polycrystalline diamond body becomes neutral.   
     
     
         6 . The method of processing the surface-modified polycrystalline diamond of  claim 5 , wherein the steps of embedding the non-catalyst metal into the holes comprise:
 putting a copper wheel rotating at a speed of 1400 revolutions per second (rps) into contact with the surface of the polycrystalline diamond body; and   feeding the copper wheel at 0.1 mm to 0.4 mm for strong friction such that the surface of the polycrystalline diamond body is covered in copper.   
     
     
         7 . The method of processing the surface-modified polycrystalline diamond of  claim 4 , wherein:
 boiling the polycrystalline diamond body in an aqua regia for 10 to 110 hours; and   taking the polycrystalline diamond body out of the aqua regia and rinsing the polycrystalline diamond body until the polycrystalline diamond body becomes neutral.   
     
     
         8 . The method of processing the surface-modified polycrystalline diamond of  claim 7 , wherein the step of embedding the non-catalyst metal into the holes comprises: placing the polycrystalline diamond body into a copper mould for electrodeposition, with the mould being used as a cathode, a copper sulfate solution being used as an electrolyte, and a pure copper plate being used as an anode. 
     
     
         9 . The method of processing the surface-modified polycrystalline diamond of  claim 4 , wherein the non-catalyst metal is one of copper, silver, aluminum, and alloys thereof. 
     
     
         10 . The method of processing the surface-modified polycrystalline diamond of any of  claim 4 , wherein each of the holes has a depth of 0.1 mm to 1 mm. 
     
     
         11 . The method of processing the surface-modified polycrystalline diamond of any of  claim 5 , wherein each of the holes has a depth of 0.1 mm to 1 mm. 
     
     
         12 . The method of processing the surface-modified polycrystalline diamond of any of  claim 6 , wherein each of the holes has a depth of 0.1 mm to 1 mm. 
     
     
         13 . The method of processing the surface-modified polycrystalline diamond of any of  claim 7 , wherein each of the holes has a depth of 0.1 mm to 1 mm. 
     
     
         14 . The method of processing the surface-modified polycrystalline diamond of any of  claim 8 , wherein each of the holes has a depth of 0.1 mm to 1 mm.