(哈爾濱理工大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150080)
摘 要: 表面張力是液態(tài)合金的重要物性參數(shù)之一， 鋁合金表面張力與其變質(zhì)處理效果及充型能力等質(zhì)量參數(shù)密切相關(guān)， 研究鑄造鋁合金表面張力快速檢測方法及裝置，對于開發(fā)鋁合金熔煉質(zhì)量爐前實(shí)時評價系統(tǒng)具有非常重要的實(shí)際意義。 介紹了一種液態(tài)鋁合金表面張力快速測試的新方法和新裝置， 新方法以固定時間內(nèi)吹入被測液體的氣泡個數(shù)以及氣泡在生長過程中內(nèi)部壓差變化為信息參數(shù)，通過回歸公式求解表面張力。 基于該方法研制的表面張力新型測試裝置由單片機(jī)測控單元、 探頭及其鎖緊和升降機(jī)構(gòu)、 供氣單元等部分構(gòu)成。 采用新裝置可在5 s內(nèi)測得鋁合金表面張力， 且具有較高的測試精度。
關(guān)鍵字: 液態(tài)鋁合金;表面張力;新方法;新裝置
（ School of Materials Science and Engineering,
Harbin University of Science and Technology，Harbin 150080, China）
Abstract: Surface tension is one of the important physical features of liquid metal, some quality parameters such as inoculation effect and filling ability of aluminum alloy relate to surface tension. So it is very significant to develop new method and device of fast testing surface tension of liquid metal for evaluating the quality of melting aluminum in front of the furnace. A new method of fast testing liquid aluminum was introduced. The new method takes the number of blowing bubbles into liquid metal during limited period and the pressure differential in the bubble during its growing process as information parameters, then calculates the surface tension equivalent of the melt by means of regression equation. An automatic device of testing surface tension based on the new method consists of an air compressor, a heat resistant detector, detector holder, detector driver and a testing and controlling unit. With the new method and device, surface tension of liquid cast aluminum can be tested accurately in 5 s.
Key words: liquid aluminum; surface tension; new testing method; new testing device
