強剪切作用下氬氣泡破碎行為及其對7075鋁合金除氣效果的影響
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-04-01
采用一種新型定子-轉子型強剪切裝置，通過水模擬實驗和鋁熔體除氣實驗相結合的方法研究強剪切作用對鋁合金除氣過程中氬氣泡的影響規律，進而研究其對7075鋁合金的除氣作用。
強剪切作用下氬氣泡破碎行為及其對7075鋁合金除氣效果的影響Dispersion behaviour of Ar bubbles under intensive shearing and its effect on degassing effect of 7075 alloy采用一種新型定子-轉子型強剪切裝置，通過水模擬實驗和鋁熔體除氣實驗相結合的方法研究強剪切作用對鋁合金除氣過程中氬氣泡的影響規律，進而研究其對7075鋁合金的除氣作用。結果表明：強剪切對氬氣泡具有強烈的破碎和分散作用，能夠將通入熔體的氣泡轉變為非常細小的氣泡，并均勻分布于熔體之中。這種強剪切作用對7075鋁合金具有非常高效的除氣作用。在適當的除氣條件下，經過1 min除氣，合金密度指數Di由13.20%降低到0.65%，實測鋁中氫的含量由2.90 μL/g降低到1.10 μL/g，這顯著優于傳統旋轉除氣方法。還詳細研究除氣時間以及除氣后靜置時間對氫含量的影響，并分析強剪切工藝高效除氣的機理。
The water simulation and alloy melt degassing experiments were carried out to study the effect of intensive shearing on Ar bubbles and its effect on the degassing of 7075 alloy by the application a newly developed stator-rotor type high shear unit. The results show that the intensive shearing can significantly disperse the Ar bubbles and improve the uniformity of their distribution. The alloy degassing experiments show that the high shearing can evidently degas 7075 aluminium alloy with a high efficiency. Under a proper degassing condition, after degassing for 1 min, the density index decreases from 13.20% to 0.65% and the measured concentration of hydrogen in the melt Al obviously reduces from 2.90 μL to 1.10 μL, which shows a much higher efficiency than that using the conventional rotary degassing method. The effects of the degassing time and isothermal holding time after degassing on hydrogen content were also studied and the mechanism of high efficient degassing of intensive shearing was analyzed.
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AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
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