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c) Delaminating effect at the high level The cross sections of two B1 boards from pure SCF CO2 and SCF CO2 plus 7 mole % H2O treatment at 6000 psi, 250 C with 3 hours are pictured with a microscope at 60X for comparison, as shown in figure 28 and 29 respectively. Figure 28 Cross section of B1 by SCF Figure 29 Cross section of B1 by SCF CO2 CO2 treated at 6000 psi, 250 C for 3 hrs +H2O treatment at 6000 psi,250 C for 3 hrs From the two figures, we can see that 7 mole % of water can largely enhance the delaminating of PCB boards during its foaming in SCF CO2 treatment. The gap in cross section of B1 board by SCF CO2 plus H2O treatment is estimated 4 times as big as that in cross section of B1 board by pure SCF CO2 treatment. All the layers in B1 cross section in figure 29 are successfully delaminated, when compared with the small delaminating effect in figure 28. d) Summary By the comparisons at the three levels for delaminating effect on B1 board between pure SCF CO2 treatment and SCF CO2 plus water treatment, we can conclude that the PCB delaminating can be enhanced by addition of water as co-solvent when experimental conditions are set at their effective regions. The enhancement is improved when experiment parameters are set at higher levels, which is consistent with the previous WRP analysis that PCB dissolution effect is dependent on pressure factor but highly related to temperature factor when time is set for 3 hours for reaction. Comparison on surface cracking This part is for examining the surface cracking induced by the 7 mole % of water added as co-solvent. The board selected for comparison is the B2 board which is the second biggest one among the five specimens. The surface images are all taken by a microscope at 10X magnitude. The comparison are conducted at three levels according to the pressure and temperature conditions, namely high level at 6000 psi, 250 C with 3 hours treatment; middle level at 4000 psi, 200 C with 3 hours treatment and low level at 2000 psi, 150 C with 3 hours treatment. a) Surface cracking at the low level The surfaces of two B2 boards from pure SCF CO2 and SCF CO2 plus 7 mole % H2O treatment at 2000 psi, 150 C with 3 hours are pictured with a microscope at 10X for comparison, as shown in figure 30 and 31 respectively. 26PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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