| Autor: |
Midson, Stephen P., de Campos Neto, Nelson Delfino, May, William, Korenyi-Both, Andras L., Kaufman, Michael J. |
| Zdroj: |
International Journal of Metalcasting; 20240101, Issue: Preprints p1-14, 14p |
| Abstrakt: |
Soldering (sticking) to and erosion of steel die materials are common problems in commercial aluminum die casting operations. One approach for minimizing both of these issues is to place physical vapor deposition (PVD) coatings onto the surfaces of the die components. An alternate approach is the use of higher thermal conductivity die materials, such as tungsten-based alloys. While PVD coatings are becoming relatively widely used, there is little rigorous data to identify the best coating conditions to maximize life of the coatings. There is also little information on the life of alternate nonferrous die materials. This paper reports on a laboratory study that examined the effect of PVD coating conditions and alternate die materials on die component life. The test involves rotating pins fabricated from different die materials and PVD coated H13 tool steel in a crucible of molten aluminum alloy held at a temperature of 680±10 °C. The pins were periodically removed from the melt (typically every 1–2 h) to observe their condition. The effect of two aluminum alloy composition were evaluated, A380 and a binary Al–11%Si alloy. The results showing rates of dissolution of the pins are presented. Examination of failed pins showed that the molten aluminum did not appear to attack or dissolve the PVD coatings, but the coatings failed when the molten aluminum penetrated the coating though cracks, and dissolved the steel substrate, causing the cracked coating to flake off. Once the coatings were breached by the liquid aluminum, the samples quickly failed. A mechanism describing factors controlling chemical soldering of the aluminum to die casting dies is presented. |
| Databáze: |
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