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Heat treatment furnace facilities for the aluminum industry

HICON® bell annealers for capacitor foil

Aluminum foil for the electronics industry must fulfill the very highest quality requirements. Only the highest purity aluminum is used for manufacturing high-capacitance foil.

The purity of the aluminum increases depending on the operating voltage. For low voltage applications grade AI3N8 is sufficient, while high voltages require AI4N (AI 99.99 %).

An extremely pure process atmosphere is used during the anneal to achieve a uniform Al²O³ layer on the foil surface that in turn promotes the formation of tunnel etching during a subsequent process. The material is processed at annealing temperatures between 550 °C and 620 °C, and the atmosphere dewpoint must be below -30 °C.

To fulfill these strict criteria the anneal has to take place in a furnace with a retort that is both gas-tight and vacuum-tight. The HICON®annealer is ideal for this application.

Bell annealers

Pure aluminum foil
Vacuum-purged bell annealer

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