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揭示了将碱性碳酸镁转变为纯净可热压氟化镁的工艺过程。这样的氟化镁可用作热压红外透射光学块件。这工艺过程包括:使碱性碳酸镁悬浮液与CO_2接触,形成充分的二碳酸镁或碳酸镁水化物,在这过程中,悬浮液的微粒发生变化。通过在不稳定的二碳酸镁和碳酸镁微粒的水化物之间建立的平衡关系,使悬浮液的碳化作用增大颗粒的溶解度。当碳化时,悬浮液与稍微过量的HF反应,沉淀出细散的氟化镁颗粒。用NH_4OH中和过量的HF。这种沉淀的颗粒经烘干和焙烧后,就得到异常纯净和质量均匀的可热压的氟化镁粉末。已经制备了一种可热压的氟化镁粉末,在20℃时具有具体均匀的折射率n_D=1.3850。这种粉末的大多数微粒的平均直径大于5微米,不经研磨就可热压。
The process of converting basic magnesium carbonate into pure, autoclavable magnesium fluoride is disclosed. Such magnesium fluoride can be used as a thermocompression infrared transmission optical block. The process involves contacting the suspension of basic magnesium carbonate with CO 2 to form sufficient magnesium or magnesium carbonate hydrate, during which time the particulates of the suspension change. The carbonization of the suspension increases the solubility of the particles by establishing a balance between the instability of the hydrates of the magnesium percarbonate and the particles of magnesium carbonate. When carbonized, the suspension reacts with a slight excess of HF to precipitate finely divided magnesium fluoride particles. Excess HF was neutralized with NH 4 OH. After the precipitated particles have been dried and calcined, unusually pure and homogeneous hot-pressed magnesium fluoride powders are obtained. A hot-formable magnesium fluoride powder has been prepared having a particularly uniform refractive index n D = 1.3850 at 20 ° C. Most of the particles of this powder have an average diameter greater than 5 microns and can be hot pressed without grinding.