Method for manufacturing high melting point metal based objects

Abstract

A method for manufacturing a high melting point metal based object includes providing pure high melting point metal based powder, fabricating a green object from the powder, by way of a laser sintering technique, providing infiltration treatment to the green object, and providing heating pressure treatment to the green object The temperature to the green object is controlled to the re-sintering point of the green object.

1 - 10 . (canceled) 
     
     
         11 . A method for manufacturing a high melting point metal based object, the method comprising:
 providing a powder mixture comprising a high melting point metal and balanced with a low melting point metal binder, wherein the high melting point metal is greater than 50 vol %;   fabricating a green object from the powder mixture, by way of a laser sintering technique; and   providing heating pressure treatment to the green object, wherein the temperature to the green object is controlled to the re-sintering point of the green object.   
     
     
         12 . The method of  claim 11 , wherein the powder mixture comprises tungsten and is balanced with nickel. 
     
     
         13 . The method of  claim 12 , wherein the high melting point metal based object comprises a fabricated section having a thickness ranging from about between 0.1-0.5 mm. 
     
     
         14 . The method of  claim 13 , wherein the high melting point metal based object comprises a collimator. 
     
     
         15 . The method of  claim 14 , wherein a thickness of the collimator is about between 0.1-0.2 mm. 
     
     
         16 . The method of  claim 15 , wherein providing heating pressure treatment comprises:
 providing heating treatment to the green object at a temperature between 1000-1300 degrees Celsius, and at a pressure above 100 MPa.   
     
     
         17 . The method of  claim 16 , wherein the green object is located in a heating pressure device to accomplish the heating pressure treatment. 
     
     
         18 . The method of  claim 17 , wherein the heating pressure device is an oven comprising a temperature and pressure control. 
     
     
         19 . The method of  claim 11 , wherein fabricating comprises:
 a) applying a layer of the powder on a fabrication platform;   b) scanning the layer by a laser beam to sinter the layer of powder;   c) lowering the fabrication platform for a predetermined distance; and   d) optionally repeating steps a) to c).   
     
     
         20 . The method of  claim 11 , further comprising:
 providing infiltration treatment to the green object before providing the heating pressure treatment.