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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Water release and crystallisation of glass powders
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Water release and crystallisation of glass powders

机译：玻璃粉末的水释放和结晶

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Water concentration,C_w and diffusion coefficient,D_w,for silicate glass and crystal powders were quantitatively studied from water release experiments by isothermal vacuum hot extraction(VHE).Calibration was made with gypsum and the minimal water detection rate was found as 9 nmol/min.This is typical for powdered(40-50 mum)soda-lime-silica glass containing 1 wt ppm water.The 'powder method' utilised for calculation D_w is applicable to glass and crystal powders and does not require expensive sample preparation,transparency or the knowledge of extinction coefficients.Limited by the minimum detection rate and by surface water desorption,powders of 40-80 mum in size turned out to be most useful,and D_M can be measured in the range of 10~(-8)-10~~(-12)cm s~(-1).Calculated values of D _w for soda-lime-silica and silica glasses agree well with literature data.New results were obtained from potash-lime-silica,lamp bulb and cordierite glasses.For the sake of comparison,cordierite single crystals were also measured.
机译：通过等温真空热萃取（VHE）进行了放水实验，定量研究了硅酸盐玻璃和晶体粉末的水浓度，C_w和扩散系数D_w。用石膏进行了校准，最低检出率为9 nmol / min。这通常用于水含量为1 wt ppm的粉状（40-50 mum）钠钙硅玻璃。用于计算D_w的``粉末法''适用于玻璃和晶体粉末，不需要昂贵的样品制备，透明度或受最小检出率和地表水解吸的限制，最有效的粉末是40-80微米的粉末，D_M可以在10〜（-8）-10的范围内测量~~（-12）cm s〜（-1）。钠钙硅酸盐和二氧化硅玻璃的D _w的计算值与文献数据吻合得很好。钾盐钙硅，灯泡和堇青石玻璃获得了新的结​​果为了比较，堇青石单晶还测量了al。

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