The Synthesize Of The Basic Magnisium Chloride Whisker

The preparation of the basic magnesium chloride whisker, a new kind of inorganic whisker, is studied in this paper. The optimum conditions are conformed according to the effect of the varies factors on the nucleation, growth and shape, such as concentration of magnesium chloride, the type and volume of alkali, the time of feeding and the temperature of nucleation and so on, besides, the effect on the velocity of nucleation is studied. At the same time, some physical and chemical properties of the production are measured, including solubility, specific gravity, apparent density, the stability to the acid, alkali and heat. The experimental results show that the sequence of the effect of the four factors from large to small is concentration of magnesium chloride, volume of alkali, the time of feeding and the temperature. But the strong alkali is disadvantageous to the synthesis of the whisker. The needle crystals with uniformity, moderate granularity and high purity are gained when the concentration of magnesium chloride is 4mol/l. the rate of magnesium chloride to alkali is 2:1-4:1, the temperature is 30癈. and ammonia is dripped at a fast and constant speed. The product is white power, with the length of 5-15 u m, the diameter of 0.1-1 u m, the rate of length to diameter of bigger than 30, the solubility of 0.02342g/l, the specific gravity of 1.681 lg/cm3, the apparent density of 0.1121g/cm3, not good stability to acid, and is decomposed when it is heated to 405 癈.The basic magnesium chloride whisker that is synthesized in this experiment has the character of the low cost, the mild conditions and easy operation. The experiment settles the foundation for its application and exploitation in the materials in the future.