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日本的高纯度铝工业当前，工业上生产的铝的纯度为９９．５％～９９．９％，纯度更高的铝是用三层法与偏析法精制的。半导体工业与超导体稳定化要求铝的纯度达到９９．９９９％，而大规模集成电路配线需用纯度为９９．９９９９％以上的铝，而其中的Ｕ与Ｔｈ应＜１ｐｐｂ。...
Japan’s High Purity Aluminum Industry At present, industrially produced aluminum has a purity of 99.5% to 99.9%. A higher purity aluminum is refined by a three-layer method and a segregation method. Stabilization of the semiconductor industry and superconductors requires an aluminum purity of 99.999%, whereas LSIs require an aluminum purity of 99.9999% or more, with U and Th <1ppb. ...