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为了在铸型中获得深过冷合金熔体,实现快速凝固,以SiO_2玻璃粉,C_2H_5OH,N_2O,37％HCl,Si(OC_2H_5)_4和H_3BO_3为原料,用熔模铸造法和浸涂结合分级热处理工艺在壳型内表面制备了B-F_3复合玻璃涂层。XRD分析表明,该涂层在高温下具有极高的结构稳定性,在(1773±5)K之下B保温90min和F_3保温60min均无析晶。将获得深过冷的Cu_(50)Ni_(50)熔体浇入该涂层中,合金溶体过冷度遗传性高达236 K。而且,在涂层中于154K过冷度下凝固后获得了块体快速凝固单晶。
In order to obtain the deep supercooled alloy melt in the mold and achieve rapid solidification, SiO_2 glass powder, C_2H_5OH, N_2O, 37% HCl, Si (OC_2H_5) __4 and H_3BO_3 were used as raw materials and combined with investment casting and dip coating Heat treatment process in the shell surface prepared B-F_3 composite glass coating. XRD analysis shows that the coating has high structural stability at high temperature, and no precipitation occurs at 90 ℃ and 60 ℃ for B at (1773 ± 5) K for a long time. The Cu50No50 melt, which was obtained from the deep subcooling, was poured into the coating. The inheritance of undercooling of the alloy was as high as 236K. Moreover, a bulk rapidly solidified single crystal was obtained after solidification in the coating at a supercooling of 154K.