CaO-BaO-Al2O3红外玻璃的形成及制备

通过添加BaO增加了铝酸钙玻璃的成玻能力，确定了CaO-BaO-Al2O3三元系统的成玻区域:25～45 mol%的Al2O3，45～65 mol%的CaO， 0～18 mol%的BaO，在成玻区域内采用Hruby值研究Al2O3/CaO值和BaO含量对系统成玻能力的影响，发现当Al2O3/CaO值为0.60、BaO含量为8 mol%时，系统的成玻能力最强。以成玻能力最好的56 CaO-8 BaO-36 Al2O3组成为基础，将真空烧结后几乎不含水的玻璃配合料分别在大气环境下、干燥氮气保护以及干燥氮气保护+CCl4搅拌等3种不同的条件下进行熔制，分析玻璃的红外透过光谱和残余水分含量。结果表明:采用干燥氮气保护+CCl4搅拌的方法，7 mm玻璃在2.9 um的透过率接近84%，残余水分含量仅为0.003 7，基本消除了OH-1的影响。

Glass-forming ability and preparation on CaO-BaO-Al2O3 glasses

Glass-forming ability of calcium aluminate glasses is improved with the actlition of BaO,glass-forming region of CaO-BaO-Al2O3 ternary system is identified which is the area with content of Al2O3 between 25 mol% and 45 mol%,CaO between 45 mol% and 65 mol% and BaO between 0 mol% and 18 mol%.According to the study of ifrcdo,value.Influences of the ratio of content of Al2O3 and CaO(A/C) and the content of BaO on glass-forming ability were discussed based on the value of Hruby.It was found that glass-forming ability of 56 CaO-8 BaO-36 Al2O3 is best when the value of A/C is 0.60 and the content of BaO is 8 mol%.Batches without any water sintered in normal air inthe cicwstance,protected by dry nitrogen as well as stirred with CCl4 respectivelf into,30 as to detect as IR-transmittance spectrum and investigated by residual contents of water namely B(OH).which indicated that the transmittance at 2.9 μm is nearly 84% and the residual B(OH) is 0.003 7.It was demonstrated that hydroxyl was almost removed by stirring with CCl4 while protected by dry nitrogen.