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鍛造鎂合金大致可以分為三個階段

  • 作者:立博
  • 來源:wm.yonggespace.com
  • 發(fā)布時間:2021-06-11
  • 點擊:0

(1)第一個階段是一個基礎(chǔ)階段 主要在鎂中加入鋁和鋅,即Mg-A1-Zn系合金。鎂合金可以砂型鍛造、消失模鍛造、壓鑄、半固態(tài)鍛造等方法成型,近年來發(fā)展起來的鎂合金壓鑄新技術(shù)有真空壓鑄和充氧壓鑄,前者已成功出產(chǎn)出AM60B鎂合金汽車輪毅和方向盤,后者也己開始用于出產(chǎn)汽車上的鎂合金零件。

。這類合金可得到與鍛造鋁合金相近的抗拉強(qiáng)度。

(2)第二個階段是一個改進(jìn)階段 在鎂中加入鋯,常見的含鋯合金系有Mg-Zn-Zr,Mg-RE-Zr等。但總體上看,與發(fā)達(dá)國家比擬我國的壓鑄件綜合質(zhì)量較差(加工余量大、廢品率高、合金利用率低、鍛造工藝裝備基礎(chǔ)前提差、環(huán)保和能耗題目較嚴(yán)峻、缺乏專門人才和新工藝新產(chǎn)品開發(fā)能力)。我國有色金屬壓鑄已有相稱的基礎(chǔ),現(xiàn)擁有壓鑄廠點及相關(guān)企業(yè)總共約3000家,壓鑄機(jī)制造廠約有20家,年產(chǎn)壓鑄件300000t。

鍛造鎂合金比變形鎂合金的應(yīng)用要廣泛得多。在AZ91鎂合金基礎(chǔ)上添加不同含量的混合稀土,對其鑄態(tài)和固溶時效的組織及機(jī)能也有顯著的效果。為了進(jìn)一步進(jìn)步保護(hù)作用和減少較貴的SF6氣體的用量,國外一般在SF6氣體中混合空氣或其他干燥氣體如CO:混合氣體保護(hù)效果好,但是存在以下題目:

1)污染環(huán)境,SF6會產(chǎn)生S02、SF4等有毒氣體,SF6對全球變的作用是CO2的24900倍;

2)設(shè)備復(fù)雜,需要復(fù)雜的混氣裝置和密封裝置;

3)侵蝕設(shè)備,明顯降低坩堝使用壽命??梢哉f我們現(xiàn)有的基礎(chǔ)完全不能適應(yīng)鎂合金工業(yè)化的要求。但是,該劑使用前要重新脫水,使用時會開釋出嗆人的氣息。

最近,上海交通大學(xué)輕合金精密成型國家工程研究中央通過同時加入幾種元素,開發(fā)了一種阻燃機(jī)能和力學(xué)機(jī)能均良好的轎車用阻燃鎂合金,成功地進(jìn)行了轎車變速箱殼蓋的產(chǎn)業(yè)試驗,并出產(chǎn)出了手機(jī)殼體、MP3殼體等電子產(chǎn)品外殼。


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