Abstract
Effects of substrate temperature on flattening morphologies of NiCrCoAlY and zirconia droplets in plasma spraying metal matrix composites were studied by analyzing and comparing SEM micrographs. The results show that when depositing on the non-preheated polished stainless steel substrate, the NiCrCoAlY splats are in disk-like shape with piled edges and splashed fragments, which have inevitably influence on the following flattening droplets. If the substrate is preheated up to 200°C, the piled edges and splashed fragments within NiCrCoAlY splats decrease, and the flattening behavior of the following droplets is improved. The zirconia splat morphology on the non-preheated polished stainless steel substrate is round in shape with crack and finger prolongation. The number of cracks and finger prolongations reduces correspondingly with increasing the substrate temperature. Furthermore, when the substrate is preheated up to 200°C, NiCrCoAlY coating porosity changes unapparently while the zirconia coating porosity reduces profoundly.
| Original language | English |
|---|---|
| Pages (from-to) | 114-119 |
| Number of pages | 6 |
| Journal | Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica |
| Volume | 23 |
| Issue number | 6 |
| Publication status | Published - Dec 2006 |
Keywords
- Flattening
- Plasma spray
- Splat morphologies
- Substrate preheating