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焊接石墨模具選用固定碳≥99.9% 的高純石墨（雜質(zhì)≤50ppm），經(jīng) 2800℃高溫石墨化處理，在1600℃真空或惰性氣氛中幾乎不揮發(fā)（總揮發(fā)物≤0.005%），避免了金屬模具高溫下的元素?cái)U(kuò)散（如不銹鋼模具的 Cr、Ni 會污染鈦合金焊縫）。在1200℃鎳基合金焊接中，石墨模具的污染率＜0.01%，而陶瓷模具因釉料掉落污染率達(dá) 0.5%。
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