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选用透明的氯化铵水溶液作为研究对家,观察它在结晶过程中晶核形成、长大到结晶终了的全过程;观察树枝晶的结构、等轴晶和柱状晶的形态特征;观察振动结晶和引入外来晶核结晶的形态。这种结晶过程与金属结晶过程在某些方面极为相似,用它模拟金属结晶条件和结晶组织,以找出一些相应的规律,研究和解释金属凝固时发生的现象是很有意义的。把它做为教学实验,还具有直观、形象的特点,增加学生的感性认识。
A clear aqueous solution of ammonium chloride was chosen as the research target. The nucleation and growth of nuclei were observed during the crystallization. The morphology of dendrite, equiaxed and columnar crystals were observed. The vibrational crystallization And the introduction of foreign nucleated crystal morphology. This crystallization process and the metal crystallization process are very similar in some aspects. It is used to simulate the metal crystallization conditions and the crystalline structure to find out some corresponding laws. It is very meaningful to study and explain the phenomenon that occurs when the metal is solidified. Put it as a teaching experiment, but also has the characteristics of visual, image, increase students’ perceptual knowledge.