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首页> 外文会议>International Conference on Advanced Ceramics and Composites >WETTING AND REACTION CHARACTERISTICS OF AL_2O_3/SIC COMPOSITE REFRACTORIES BY MOLTEN ALUMINUM AND ALUMINUM ALLOY
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WETTING AND REACTION CHARACTERISTICS OF AL_2O_3/SIC COMPOSITE REFRACTORIES BY MOLTEN ALUMINUM AND ALUMINUM ALLOY

机译：熔融铝和铝合金润湿和反应特性Al_2O_3 / SiC复合耐火材料

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摘要

The reactive wetting behavior in molten aluminum (Al) and Al alloy was investigated for alumina-silicon carbide composite refractory materials using an optimized sessile drop method at 900 deg C in a purified Ar-4 percent H_2 atmosphere. The time dependent behavior of the contact angle and drop geometry was monitored and the wetting kinetics were determined. The initial contact angle between the liquid Al/Al alloy and the refractory substrates was found to be greater than 90° and to gradually decrease with time. For two of the materials, it was found that the contact angles decreased to and angle less than 90 deg by the end of the two-hour test. For the third material, the contact angle was still greater than 90 deg at the conclusion of the two-hour test. The difference in wetting properties among the three types of refractories is attributed to their microstructural and compositional variations. The effect of magnesium in the molten Al alloy drops on the wetting kinetics and the reaction with the refractory substrates are also discussed. The results obtained provide important understanding of the wetting and corrosion mechanisms of alumina and silicon carbide materials in contact with molten aluminum.
机译：在纯化的Ar-4％H_2气氛中，在900℃下使用优化的无晶体滴方法研究了氧化铝 - 碳化硅复合耐火材料的反应润湿行为。监测接触角和下降几何的时间依赖性行为，测定润湿动力学。发现液体Al / Al合金和耐火材料衬底之间的初始接触角大于90°，​​随时间逐渐减少。对于两种材料，发现接触角在两小时测试结束时降低至少于90°的角度。对于第三种材料，在两小时测试结束时，接触角仍然大于90℃。三种类型的耐火材料中的润湿性质的差异归因于其微观结构和组成变化。还讨论了熔融Al合金中镁在润湿动力学上的影响及与耐火材料衬底的反应。获得的结果为与熔融铝接触的氧化铝和碳化硅材料的润湿和腐蚀机制提供了重要的理解。

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