<正> 在Al和Al合金中加入一定量RE能提高强度和抗腐蚀性。有人测定了Al及Al合金的表面张力,但有关Al-RE表面张力、密度及与BN润湿性和附着功的测定尚未见报道。 我们用卧滴法进行了这项实验。实验装置及计算方法见文献〔3—5〕。所用垫板选用了BN。因为在950℃以上,Al润湿Al_2O_3且起化学反应(4Al+Al_2O_3=3Al_2O)生成挥发性物质。而BN是化学稳定的,不与Al和Al合金起反应。甚至接近
The density, surface tension, wettability and adhesive power of liquid high purityAl (99.999 wt-%), technical pure Al (99.6 wt-%) and Al-RE alloy on BN plate were measuredusing sessile drop method. The results show that both the density and surface tension graduallydecrease but the adhesive power and wettability gradually increase with increasing temperature.The density increases and the shaface tension, wettability as well as adhesive power decreasewith the increase of RE content respectively.
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