|
5469 |
|
Thursday, June 08, 2017, Hall 28 2:20 PM Equipment / Consumables & Powders, Wires, Suspensions II |
|
Ultrafine powders for low-power HVOF and HV-APS spraying |
|
Anja Lizan / Thermico GmbH & Co. KG, Germany Götz Matthäus* / Thermico GmbH & Co. KG, Germany Vadim Verlotzki/ Thermico GmbH & Co. KG, Germany Sven Janzen/ Thermico GmbH & Co. KG, Germany |
|
The currently available powders are for conventional high power HVOF or APS. There is an increasing need for low-power HVOF and HV-APS torches for coating temperature-critical parts and inner diameters. Using them for the new applications causes massive restrictions such as poor coating efficiency, much overspray, rough surface or defects in the layer structure. However, just using ultrafine powders does not solve the problem. The disadvantages in terms of fluidity and oxidation of powder particles need to be solved, too. Beside the development of modern HVOF, ID-HVOF and Three-cathode-APS coating systems Thermico pursues a continuous enhancement of customized powders. Due to this steady development, the spraying of inner diameters with just 10 20 mm stand off by using a new WC carbide powder which is able to absorb enough energy out of the low power flame to build up a very dense high quality coating was realized. The modified WC Co 83 17 powder is available for ID HVOF. The high quality coating of outer diameters with a HV-APS is another solution which has successfully been developed. Therefore a Cr3C2-NiCr-Cr powder was modified in terms of high coating quality combined with high deposit efficiency. Another goal was to establish a high quality HV-APS coating to prices competitive to HVOF. The following lecture is about the coatings and their properties which were made out of the modified powders. |