Alkali-free glass and method for producing same
A technology of alkali-free glass and manufacturing method, which is applied in glass production and other directions, and can solve problems such as high density and large thermal expansion
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Embodiment 1～3、 comparative example 1～3
[0134] The raw materials of each component were prepared so as to obtain the target composition shown in Table 1, and melted at a temperature of 1500° C. for 1 hour using a platinum crucible.
[0135] The glass composition is shown in Table 1 (unit: mass %, but SO 3 The content of the glass is ppm) and the β-OH value of the glass (as an indicator of the moisture content in the glass is measured according to the following steps, unit: mm -1 ). As the grain size of the quartz sand in the raw material used at this time, the median diameter D 50 Table 1 summarizes the proportion of particles with a particle diameter of 2 μm or less and the proportion of particles with a particle diameter of 100 μm or greater. In addition, the mass ratio (in MO conversion) of the hydroxide raw material in alkaline earth metal is also shown in Table 1 collectively.
[0136] [Measuring method of β-OH value]
[0137] The glass sample is mirror-polished on both sides so that the thickness of the pl...
Embodiment 4～7
[0148] The raw materials of each component were prepared so as to obtain the target composition shown in Table 2, melted in a continuous melting kiln, and formed into plates by a float method. During melting, the glass was homogenized by stirring using a platinum stirrer. The glass composition is shown in Table 2 (unit: mass %, but SO 3 The content of the glass is ppm) and the β-OH value of the glass (as an indicator of the moisture content in the glass is measured by the above steps, unit: mm -1 ). As the grain size of the quartz sand in the raw material used at this time, the median diameter D 50Table 2 summarizes the proportion of particles with a particle diameter of 2 μm or less and the proportion of particles with a particle diameter of 100 μm or greater. In addition, the mass ratio (in MO conversion) of the hydroxide raw material in alkaline earth metal is also shown in Table 2 collectively.
[0149] Table 2
[0150]
[0151] In addition, the glasses of Examples...
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