Abstract
Grit blasting pre-treatment on substrate surface of SUS316L stainless steel was carried out by changing the grit blasting pressure. Variation of the substrate surface state and its influence on bond strength of high velocity oxy-fuel sprayed (HVOF) TiAl-Nb/NiCrAl coatings were studied. The results show that substrate surface roughness, width and depth of pits on substrate surface, pores at the interface between substrate and NiCrAl coating, and area fraction of residual grits on the surface all increase with increasing of grit blasting pressure. The bond strength of coatings firstly increases and then decreases with increasing of substrate surface roughness, it can reach the maximum value of 44.5 MPa when the substrate surface roughness R a is 8.33 μm.
| Original language | English |
|---|---|
| Pages (from-to) | 105-109 |
| Number of pages | 5 |
| Journal | Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment |
| Volume | 32 |
| Issue number | 12 |
| State | Published - Dec 2011 |
| Externally published | Yes |
Keywords
- Bond strength
- Grit blasting
- HVOF
- TiAl-Nb
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