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采用淬火法研究CaF_2-Al_2O_3体系的相平衡关系,并作出相图。氟化钙与氧化铝构成简单共熔二元系,共熔点是1290±5°,7分子％Al_2O_3。氟化钙与氧化铝的固溶体(Pascal)以及CaAl_2O_3F_2与CaAl_(10)O_(15)F_2化合物(Günther等)在本工作中均未能证实。在空气中,氟化钙与氧化锚生成CaAl_4O_7(1275°),反应主要按 CaF_2+2Al_2O_3+H_2O→CaAl_4O_2+2HF或 3CaF_2+7Al_2O_3→3CaAl_4O_2+2AlF_3 2AlF_3+3H_2O→Al_2O_3+6HF进行。热力学计算的结果支持氟化钙与氧化铝的共存现象及上述氟化钙与氧化铝之间的化学变化。
Quenching method was used to study the phase equilibrium of CaF_2-Al_2O_3 system. Calcium fluoride and alumina constitute a simple eutectic binary system with a total melting point of 1290 ± 5 ° and 7% Al 2 O 3. Pascal and CaAl_2O_3F_2 and CaAl_ (10) O_ (15) F_2 compounds (Günther et al.) Of calcium fluoride and alumina failed to be confirmed in this work. In the air, CaAl_4O_7 (1275 °) is formed between calcium fluoride and the oxidation anchor. The reaction is mainly carried out according to CaF_2 + 2Al_2O_3 + H_2O → CaAl_4O_2 + 2HF or 3CaF_2 + 7Al_2O_3 → 3CaAl_4O_2 + 2AlF_3 2AlF_3 + 3H_2O → Al_2O_3 + 6HF. The results of the thermodynamic calculations support the coexistence of calcium fluoride and alumina and the chemical changes between the above calcium fluoride and alumina.