Table 3.
Total porosity, open strut porosity, and compressive strength of aluminum foams thermally processed for 3 h at 750 °C in air and at 750–850 °C in Ar.
| Sample | Linear Shrinkage, % | Total Porosity a, % | Cell Porosity (Pcell) b, % | Total Strut Porosity c, % | Strut Porosity (Ps) d, % | Hollow Strut Porosity e, % |
|---|---|---|---|---|---|---|
| Air 750°C | 0 | 90.4 | 78.6 | 58.5 | 51.6 | 6.9 |
| Ar 750 °C | 21 | 90.7 | 85.9 | 39.7 | 29.8 | 9.9 |
| Ar 800 °C | 21 | 90.2 | 86.6 | 35.6 | 25.0 | 10.6 |
| Ar 850 °C | 23 | 90.9 | 86.5 | 40.0 | 29.5 | 10.5 |
a (Vmaterial pores+Vhollow strut pores+Vcell pores)/Vfoam; b Including the cavities after PU template burnout (Vcell pores+Vhollow strut pores)/Vfoam; c Related to the overall strut volume (Vhollow strut pores+Vmaterial pores)/(Vmaterial+Vhollow strut pores+Vmaterial pores); d Related to the strut volume Vmaterial pores/(Vhollow strut pores+Vmaterial+Vmaterial pores); e The cavities after PU template burn out.