Patent Number: 
Section: claims

1. A method for manufacturing a high melting point metal based object, the method comprising:providing a powder consisting of only a pure, high melting point metal;fabricating a green object from the powder consisting of only the pure, high melting point metal, by way of partially melting the powder using a laser sintering technique;after fabricating the green object, providing an infiltration treatment to the green object by positioning the green object in a container and adding a metal solution to the container; andafter providing the infiltration treatment, positioning the infiltrated green object in a heating pressure device to provide a heating pressure treatment to the infiltrated green object, wherein a temperature applied to the infiltrated green object is controlled to a re-sintering point of the green object, and wherein a pressure of the heating pressure treatment combines the infiltrated green object having partially melted powder with completely dissolved metal in the metal solution. 2. The method of claim 1, wherein the metal solution comprises a Cu or Ni solution, wherein the Cu or Ni is completely dissolved in the metal solution. 3. The method of claim 1, wherein the powder consists of pure tungsten. 4. The method of claim 3, wherein the high melting point metal based object comprises a fabricated section having a thickness ranging from about 0.1 mm to about 0.5 mm. 5. The method of claim 4, wherein the high melting point metal based object comprises a collimator. 6. The method of claim 5, wherein a thickness of the collimator is about 0.1 mm to about 0.2 mm. 7. The method of claim 6, wherein providing the heating pressure treatment comprises:providing the heating pressure treatment to the infiltrated green object at a temperature between 2300-3000 degrees Celsius, and at a pressure above 100 MPa. 8. The method of claim 7, wherein the heating pressure device is an oven comprising a temperature and pressure control. 9. The method of claim 1, 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; andd. optionally repeating steps a) to c).