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Variations: Sintering Techniques in Progress

Selective Laser Sintering

Selective Laser Sintering (SLS) is a rapid prototyping method of producing models or test structures quickly. In this process a 3-D CAD program of the design guides a laser beam to "glue", cure, or sinter the pattern into the layer of the powdered metal or non-metal. The procedure is conducted on a "part-built" cylinder that lowers after the layer has been sintered. The remaining looser powder then acts as structural support for overhangs in following layers. It is noted that SLS in theory can sinter both metal and non-metal powders to make the prototypes, but it seems that the SLS method is only being used with the non-metallic powders. In industry the most common materials used in the SLS process are polymers, waxes, glasses, and nylon. Perhaps in the future it will be more feasible to use the SLS method to produce working metal prototypes. For more information about the SLS process, click here.

Spark Sintering

Spark Sintering is a process still in the experimental stages of development. The theory of Spark Sintering is that loose metal powders are shaped in a graphite mold which heated by an electric current. The powder is then subjected to a high-energy discharge which compacts and binds in one step. This seems similar to Electro-Discharge Machining, except that EDM is a subtractive process from stock material while Spark Sintering is additive and does not waste material.