Biomedical Engineering Reference
In-Depth Information
TABLE 3.5
Summary of Reported Work on Electrophoretic Deposition on Insulating Substrates
Processing
Parameters
MaterialandSuspension
Electrodes
Remarks
Ref.
Material: Y-ZrO 2 (YSZ A )
Solids loading: 4 g/L
Suspension medium:
ethanol
Anode: porous NiO-YSZ, reverse-
coated with graphite (commercial
graphite spray coating, layer
thickness 0.6-1 μ m)
Cathode: stainless steel
Voltage: 400-900 V
Time: 0.5 min
Electrode separation: 1 cm
Stirring during process: yes
• Dense deposits of thickness ~5-10 μ m on porous
substrates
• No deposition on dense substrates
• Good coating adherence
• Grain growth during iring
90
Material: Y-ZrO 2 (YSZ A )
Solids loading: 4 g/L
Suspension medium:
ethanol
Anode: porous NiO-YSZ reverse-
coated with graphite (commercial
graphite spray coating, layer
thickness 0.6-1 μ m)
Cathode: stainless steel
Voltage: 400 V
Time: 0.5 min
Electrode separation: 1 cm
Stirring during process: yes
• Dense and continuous deposits of thickness ~5-10
μ m on porous substrates
• No deposition on dense substrates
91
Material: Y-ZrO 2 (YSZ A )
Solids loading: 10 g/L
Suspension medium:
acetyl acetone
Anode: Pt
Cathode: porous NiO-YSZ
(thickness 300 μ m) of different
porosities
Voltage: 50-300 V
Time: 1-5 min
Electrode separation: 1.5 cm
Stirring during process: yes
• Deposit weight proportional to applied voltage
• Deposit thickness ~6 μ m at 50 V
• Deposit density increased with substrate porosity
• Dense deposits with good adherence to the
substrate
• Some closed porosity
• No deposition on dense substrates
92
Material: Y-ZrO 2 (YSZ A )
Solids loading: 10 g/L
Suspension medium:
acetyl acetone
Anode: Pt
Cathode: porous NiO-YSZ
(thickness 300 μ m) of different
porosities, carbon sheet backing
Voltage: 25-100 V
Time: 1-3 min
Electrode separation: 1.5 cm
Stirring during process: yes
• Deposit density increased with substrate porosity
at 25 V and 100 V, reaching a stable value with time
• Minimal threshold substrate porosity level for
electrophoresis to take place obtained from
extrapolation of deposition curve
• Threshold substrate porosity level decreased with
increasing voltage
• Deposits were dense, with good adherence and
little closed porosity
• Deposit thickness ~40 μ m at 100 V
93
( continued )
 
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