Fig. 1.
SEM images of (a) Ta powder, (b) Nb powder, (c) Sn powder, and (d) carbamide powder
Fig. 2.
(a) Photograph of the foam, (b) SEM image of the macro-pores, (c) SEM image of the cell wall (low magnification), and (d) SEM image of the cell wall (high magnification)
Table 1.
Mean size of carbamide particles and mean pores size of the sintered foams
| Carbamide particle shape | Carbamide particle size ranges (μm) | Mean carbamide particle size (μm) | Mean pore size (μm) |
|---|---|---|---|
| Irregular | –1400+1000 | 1270 | 850 |
| Irregular | –1000+710 | 860 | 590 |
| Irregular | –710+500 | 580 | 410 |
| Spherical | –1400+1000 | 1300 | 880 |
Fig. 3.
XRD patterns of the (a) Ta powder, (b) Nb powder, (c) Sn powder and (d) sintered alloy
Fig. 4.
Effect of (a) Nb content and (b) Sn content of the alloy on the Young’s modulus
Fig. 5.
Effect of porosity on (a) Young’s modulus and (b) compressive stress-strain diagram
Fig. 6.
Variation of the open circuit potential value with (a) the Nb content and (b) the Sn content of the alloy
Fig. 7.
Effect of (a) Nb content and (b) Sn content of the alloy on the Tafel curves of the samples
Fig. 8.
Effect of (a) Nb content of the alloy, (b) Sn content of the alloy, and (c) porosity content on the polarization resistance and corrosion rate
Fig. 9.
Effect of immersion time on the (a) weight loss and (b) Ta ion release in simulated body fluid solution
Fig. 10.
Effect of Nb content of the alloy on (a) weight loss and (b) Ta ion release in simulated body fluid solution
Fig. 11.
Effect of Sn content of the alloy on the (a) weight loss and (b) Ta ion release in simulated body fluid solution
Fig. 12.
Effect of porosity content of the alloy on (a) weight loss and (b) Ta ion release
Fig. 13.
Photograph of the water droplet at the surface of the sample
Fig. 14.
(a) Digital radiography result of the sample and (b) computed tomography images of the sample