Semifinished products with a structured sinter-active surface and a process for their production
A technology of active surface, sintering method, applied in the field of manufacture and application
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Embodiment 1
[0073] Ta flakes (1 cm x 1 cm) were galvanostatically formed in 0.1% phosphoric acid at 150 V at 85° C. and potentiostatically formed for another 2 hours. An oxide layer with a thickness of about 300 nm was formed on the wafer. The formed sheet was washed with FD water and dried. The product was then reduced as described above.
[0074] In the following figure 1The structured surface can be seen in the scanning electron micrograph of . Subsequent anodization of the sheet at 20 volts yielded a capacitance of 3.45 microfarads, which corresponds to a microscopic surface of 51 square centimeters. Without the structured surface, the capacitance of the flakes is below the detection limit of 500 nanofarads.
Embodiment 2
[0076] At 85° C., a Ta sheet (1 cm×1 cm) was formed by a constant current method at 400 volts in 0.1% phosphoric acid, and then anodized by a constant potential method for 2 hours. An oxide layer with a thickness of about 800 nm was formed on the wafer. The formed sheet was washed with FD water and dried. The product was then reduced as described above.
[0077] The sheet was subsequently formed at 20 volts, yielding a capacitance of 5.52 microfarads, which corresponds to a microscopic surface of 81.7 square centimeters. Without the structured surface, the sheet has a capacitance of less than 500 nanofarads.
[0078] figure 2 and image 3 The scanning electron micrographs in Figure 2 show plan and cross-sectional views (micrographs) of the structured surface.
Embodiment 3
[0080] Ta wires (diameter: 0.49 mm) were formed in 0.1% phosphoric acid at 400 volts at 85° C. by galvanostatic method and further by potentiostatic method for 2 hours. An oxide layer with a thickness of about 800 nanometers is formed on the wire. The formed thread was washed with FD water and dried. The product was then reduced as described above.
[0081] Scanning electron micrographs (see Figure 4 ) shows the plan view of the structured surface.
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Abstract
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