CAJ | 학술논문

采用熔融盐法制备片状α-Al2O3，研究了硫酸盐、煅烧温度、添加剂（磷酸盐、二氧化钛）对片状α-Al2O3晶体形貌的影响。当氢氧化铝凝胶煅烧温度为900℃时，没加硫酸盐分解所得的氧化铝晶相为κ-Al2O3晶相，而加入硫酸盐的氧化铝晶相为α-Al2O3晶相，熔融盐降低了片状α-Al2O3的形成温度，促进κ-Al2O3向α-Al2O3晶型转变。煅烧温度由900℃上升到1200℃时，片状α-Al2O3的团聚程度降低，颗粒尺寸分布更加均匀。当煅烧温度在1200℃下、磷酸盐添加量为3%、二氧化钛添加量为2%时，所制得片状氧化铝分散均匀，径厚比较大，片状氧化铝平均粒径为5.225μm、厚度约400-500 nm。
채용용융염법제비편상α-Al2O3，연구료류산염、단소온도、첨가제（린산염、이양화태）대편상α-Al2O3정체형모적영향。당경양화려응효단소온도위900℃시，몰가류산염분해소득적양화려정상위κ-Al2O3정상，이가입류산염적양화려정상위α-Al2O3정상，용융염강저료편상α-Al2O3적형성온도，촉진κ-Al2O3향α-Al2O3정형전변。단소온도유900℃상승도1200℃시，편상α-Al2O3적단취정도강저，과립척촌분포경가균균。당단소온도재1200℃하、린산염첨가량위3%、이양화태첨가량위2%시，소제득편상양화려분산균균，경후비교대，편상양화려평균립경위5.225μm、후도약400-500 nm。
α-alumina platelets were prepared by a molten salt synthesis method when Al2(SO4)3?18H2O was used as raw material. The effects of sulfates, heating temperature, additives such as Na3PO4?12H2O and TiO2 on the morphology ofα-Al2O3 were studied. When the heating temperature of aluminum hydroxide gel is 900℃, the synthesized Al2O3 without adding sulfates is mainlyκ-Al2O3;nevertheless, the synthesized Al2O3 with sulfates is mainlyα-Al2O3. So, sulfates reduce the synthesizing temperature of lfakyα-Al2O3 and promoteκ-Al2O3 toα-Al2O3 crystalline phase. When the heating temperature increases to 1200℃, most ofα-Al2O3 platelets are hexagonal in its morphology, the increase of heating temperature is beneifcial to improve the size distribution and overlapping. When the heating temperature is 1200℃, the addition of Na3PO4?12H2O reaches 4%and TiO2 reaches 2%, the lfakyα-Al2O3 is dispersed uniformly, the average particle size is 5.225μm, and the thickness of them is about 400-500 nm.