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Refractory sintering talcum powder
Talc refractory powder is a material used in the sintering process of parts printed with Filamet Copper and Filamet Bronze metal filaments. These metal filaments consist of a very high percentage of metal (80 % - 95 %) and the rest of PLA. This high metal content does not increase the complexity of printing, as all Filamet filaments are used with the same printing configuration as PLA, making them ideal materials for any type of FDM 3D printer (industrial or domestic).
The function of the refractory powder during the thermal debinding and sintering process is to act as a support for the parts, preventing their deformation during the different heat treatments.
The most common material is alumina powder, due to its excellent resistance to high temperatures. However, its low mobility means that during the shrinkage of the parts during sintering, hollow spaces can remain in some areas of the part, which can damage the surface finish or create small defects on the surface. For this reason, with materials with low sintering temperatures, such as copper or bronze, it is advisable to use other refractory powders with greater mobility to accompany the shrinkage of the parts.
Talc refractory powder has a very small particle size (11 - 15 microns) which causes it to flow more easily than alumina powder during the sintering process. This high fluidity allows the powder block to accompany the part during shrinkage, minimising the risk of surface defects and improving the finish of the part.
Talc powder optionally replaces alumina during the sintering treatment of copper and bronze in order to improve the finish of the parts and is used as a refractory material in both thermal debinding and sintering of Pyrex glass.
Refractory talc powder can be used as a substitute for alumina during the sintering process of The Virtual Foundry's copper and bronze filaments to improve the finish of the parts.
Once the thermal debinding using alumina powder has been completed, the crucible should be allowed to cool to room temperature. The workpiece must then be carefully removed and the alumina powder removed. Finally, it is necessary to fill the crucible with talcum powder, immerse the workpiece leaving a separation of at least 15 mm from the walls of the crucible and place a 25 mm layer of coconut charcoal on the surface.
It is not recommended to reuse the talcum powder.
Substitute for Al2O3 in the sintering of copper and bronze. Improves the surface finish of the parts.