(哈尔滨理工大学 材料科学与工程学院，哈尔滨 150080)
摘 要: 表面张力是液态合金的重要物性参数之一， 铝合金表面张力与其变质处理效果及充型能力等质量参数密切相关， 研究铸造铝合金表面张力快速检测方法及装置，对于开发铝合金熔炼质量炉前实时评价系统具有非常重要的实际意义。 介绍了一种液态铝合金表面张力快速测试的新方法和新装置， 新方法以固定时间内吹入被测液体的气泡个数以及气泡在生长过程中内部压差变化为信息参数，通过回归公式求解表面张力。 基于该方法研制的表面张力新型测试装置由单片机测控单元、 探头及其锁紧和升降机构、 供气单元等部分构成。 采用新装置可在5 s内测得铝合金表面张力， 且具有较高的测试精度。
关键字: 液态铝合金;表面张力;新方法;新装置
（ 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
