高純金屬鉻：燃?xì)鉁u輪機專用高溫合金的供應(yīng)問題

    high-purity chromium metal: supply issues forgas-turbine superalloys        

     根據(jù) 1995 年美國科學(xué)院（us academy of sciences）的一份報告，《高純金屬鉻：燃?xì)鉁u輪機專用高溫合金的供應(yīng)問題》第二頁第三段【共計 74 頁之第 16 頁，page 2 (16 of 74)paragraph 3】摘譯如下：

    歷史上，電解金屬鉻用于要求純度高的航空航天高溫合金，而鋁熱金屬鉻用于允許純度較低的一些高溫合金。然而，過去十年，高檔鋁熱金屬鉻的質(zhì)量有所改進(jìn)，航空航天發(fā)動機制造商已認(rèn)證這一高檔鋁熱金屬鉻用于某些較高檔的高溫合金。盡管現(xiàn)在可以使用一些與電解金屬鉻質(zhì)量相當(dāng)?shù)匿X熱金屬鉻材料，但改用鋁熱金屬鉻生產(chǎn)葉片等關(guān)鍵部件時必須經(jīng)過生產(chǎn)廠家和用戶雙方同意才行，而且必須經(jīng)過廣泛而全面的資格認(rèn)定研究才行，這種資格認(rèn)定研究將涉及到合金的生產(chǎn)和測試、試樣及鑄造和鍛造成品的生產(chǎn)和檢測、以及可能含有鋁熱金屬鉻發(fā)動機的生產(chǎn)與測試。類似的限制都要和任何工藝改變聯(lián)系起來。  

    "historically, electrolytic chromium metal was used for those aerospace superalloys that required high-purity specifications, and aluminothermic chromium metal was used for those superalloys that allowed lower-purity applications. the of high-grade aluminothermic chromium metal has improved over the past decade, however, and aerospace engine manufacturers have certified this material for some higher-grade superalloys. while aluminothermic material of e to the electrolytic material may now be available, changes in such critical applications as rotor-grade materials must be mutually acceptable to producer and user and will have to be subject to extensive studies involving production and testing of alloys, test specimens, final cast and forged products, and possibly engines containing them. similar constraints are associated with any process changes."  

    以上僅為美國科學(xué)院報告的一部分，因此，是很有價值的。  

    高溫合金中鉻可使噴氣發(fā)動機在高溫、高應(yīng)力、氧化環(huán)境中運轉(zhuǎn)。