【摘要】 利用XRD、IR和SEM,研究了八种晶体生长抑止剂对Al₂O₃纤维品化过程的影响.结果表明纯Al₂O₃纤维析晶顺序为:无定形（?）η-（?）γ-/x-（?）δ-（?）α-Al₂O₃,当引入不同抑止剂时,Al₂O₃析晶的顺序发生变化,同时还能析出k-、（?）-和0—Al₂O₃.其中抑止剂SiO₂、B₂O₃、ZrO₂和P₂O₅对α—Al₂O₅晶粒的生长有较好的抑止作用.在SiO₂—Al₂O₃系统中,随着SiO₂含量的增加,α—Al₂O₃晶粒减少,同时析出莫来石晶相.更多还原

【Abstract】 By means of XRD、IR spectrum and SEM, the effect of eight kinds of grain-growth inhibitors on the crystallization of Al2O3 fibres isinvestigated. The results show that the sequence of the crystallization in pure Al2O3fibres is as follows:amorphous→η-→γ-/x-→5-→α- Al2O3. The said sequence will change and the other phases such as k-、γ- and 0-Al2O3 may appear ifdifferent inhibitors are introduced. Amony them SiO2、B2O3、ZrO2 and P205 have good inhibiting effect on the growth of α-Al2O3grains. In SiO2-Al2O3 system, the amount of α-Al2O3 grains decreases with an increase of the amount of SiO2, and mullite phase formssimultaneously.更多还原