Using the principle of discrete-stacking, 3D printing technology is the manufacturing method to produce molded solid parts by layer-by-layer accumulation way based on three-dimensional model. For the rapid proto typing advantage of complex part, it provides the solution for the preparation of cemented carbide parts to a certain extent. After recent years of development, printing technology has played an increasingly important role in the preparation of precision parts.
1.0 Spray adhesive powder forming printing alloy
The printer carries out the STL file through the computer to form the green body by connecting the powder layers with adhesive and depositing them layer by layer. After molding, the binder is further solidified at 200℃, and then the green body is degreased and sintered according to the powder metallurgy technology. Currently cemented carbide is mostly prepared by carburizing or melting to increase density and improve property through 3D printing method. However, the large size deformation and poor surface quality after sintering is still a test for making complex structural parts.
2.0 Selective laser sintering forming alloy
Selective laser sintering is one of the rapid prototyping technology, which are indirect laser sintering and direct laser sintering. It can directly produce 3D parts of any shape using metal powder, and is suitable for small batch production of alloy.
3.0 Selective laser melting printing alloy
Selective laser melting technology uses high-energy laser beam to selectively melt and solidify powder layers to print parts layer by layer. Because of its flexibility, high performance and the potential for near-net forming of composite parts with complex structures, selective laser melting of nickel alloy, titanium alloy, stainless steel and other materials has gradually attracted wide attention, then some parts have been put into practical use.
4.0 Other 3D printing alloy forming methods.
There are three other 3D printing alloy forming methods including 3D gel printing, selective electron beam melting and cemented carbide preparation by directional energy deposition.