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用Al(OH)_3和KOH 溶液反应,然后用HF 酸化的方法制备了K_3AlF_6—KAlF_4 共晶钎剂,其中不含游离的KF。钎剂颗粒范围0.1～5μ无需研磨。在研究此种类型钎剂钎焊机理时表明,无论何种合成方法,在其过程中Si 杂质都是极易从含Si 的器壁上带人产物的。就是这种常为人们忽略的溶入杂质Si,在钎焊时起着介面活性剂的作用。此外,完全不含Si 的氟铝酸钾钎剂则活性极低。等温热重法的数据表明,AlF_3能使SiF_4稳定,这可能是在钎剂中生成了mKF·nAlF_3·pSiF_4一类化合物所致。
The K_3AlF_6-KAlF_4 eutectic flux was prepared by the reaction of Al (OH) _3 and KOH solution and then HF acidification, which contained no free KF. Flux particles range 0.1 ~ 5μ without grinding. In studying this brazing fluxing mechanism of this type, it has been shown that regardless of the method of synthesis, Si impurities are highly susceptible to the carry-over of Si-containing walls in the process. This is often overlooked for people into the impurity Si, plays a role in the brazing of surfactants. In addition, the completely non-Si-containing potassium fluoroaluminate flux is extremely low activity. Isothermal thermogravimetric data indicate that AlF 3 can make SiF 4 stable, which may be due to the formation of mKF · nAlF 3 · pSiF 4 compounds in the flux.