Impact Innovations - Cold Spray Process

In comparison to conventional thermal spray processes, cold gas spraying offers special advantages, because the spraying material is neither fused nor melted during the process. Thus, the thermal influence on the coating and the substrate material is minimized. The high kinetic energy of the particles and the high degree of deformation during the impact on the substrate that is connected with it, allows the manufacturing of homogenous and very dense coatings. The range of coating thicknesses varies from just a few hundredths of a millimeter up to several centimeters. There are mainly metallic coatings produced, which physical and chemical properties barely differ from the properties of the base material. With the latest system technology of Impact Innovations GmbH a process gas - preferably nitrogen or helium - is put into a spray gun with a pressure of up to 50 bar (725 psi) and is heated up to a maximum temperature of 1100 °C (2012 °F) in the gun housing. The subsequent expansion of the heated and high pressurized gas in a convergent-divergent nozzle down to ambient pressure results in the acceleration of the process gas up to supersonic speed and, at the same time, in the cooling down of the gas to a temperature below 100 °C (373 °F). The spray powders are injected in the convergent section of the nozzle by using a powder feeding unit and carrier gas and are accelerated to a particle speed of up to 1200 m/s in the main gas stream. In the highly focused spray jet particles impinge the - in most cases untreated - surface of the component, deform the particles and form a strongly adhesive/cohesive and low-oxide coating.



TRUMPF: Ask the Expert – TruPrint 5000 option of 500 °C preheating for aerospace applications

Further information: With the TruPrint 5000 option 500 °C preheating you avoid cracks when printing Ti6AI4V. This is because thanks to the preheating option of up to 500 °C (932° Fahrenheit), residual stresses in the titanium material are greatly reduced. In addition, components printed with preheating have higher geometrical accuracy, which means that support structures can be reduced. Therefore, you also get a high degree of freedom in design, especially for larger components. This increases the range of parts that can be built by Laser Metal Fusion. _________________________________________________________________________ Mehr Informationen: Mit der TruPrint 5000 Option 500 °C Vorheizung vermeiden Sie Risse, wenn Sie Ti6AI4V drucken. Denn dank der Vorheizoption von bis zu 500 °C werden innere Spannungen im Werkstoff Titan stark reduziert. Außerdem weisen mit Vorheizung gedruckte Bauteile eine höhere Geometriegenauigkeit auf, wodurch Stützstrukturen eingespart werden können. Sie erhalten also auch einen hohen Freiheitsgrad bei der Konstruktion, besonders bei größeren Bauteilen. So vergrößert sich das Teilespektrum, das per Laser Metal Fusion gebaut werden kann.