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Transparent glass ceramics - with small thermal expansion coefficients contg hexagonal quartz mixed crystals
Transparent glass ceramics - with small thermal expansion coefficients contg hexagonal quartz mixed crystals
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机译：透明玻璃陶瓷-具有较小的热膨胀系数，包括六方石英混合晶体
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摘要
The ceramic has a thermal expansion coefficient 19 x 10-7/degrees C (20-300 degrees C) and a S.G. within 0.5% of starting material is prepn. from glasses contg. finely divided oxides by heat treatment pref. of compsn. (in mol. %) SiO2 45-55; Al2O3 22-27; P2O5 2.5-6.5; MgO 0-15; Li2O 5-17; ZnO 0-7; TiO2 1-5; ZrO 0-2.5; K2O or Na2O 0.3-1; As2O3 0.2-1 and TiO + ZrO2 =2.5. The calculated content xi of components Si2O4 (x1), AlPO4 (x2), Li2Al2O4 (x3), MgAl2O4 (x4) and ZnAl2O4 (x5) comprise at least 80% of the glass and the equation 5 SIGMA xi DELTA Vi = O for coefficients DELTA V1 approx. - 10, DELTA V2 approx. -5, DELTA V3 approx. + 20, DELTA V4 approx. + 12 and + 10 = DELTA V5 20 is satisfied.
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机译：陶瓷的热膨胀系数为19 x 10-7 /℃（20-300℃），并且S.G.不得超过起始原料的0.5％。从眼镜续。热处理精制的氧化物。的。 SiO 2 45-55（以摩尔％计）; Al2O3 22-27; P 2 O 5 2.5-6.5;氧化镁0-15; Li 2 O 5-17;氧化锌0-7; TiO2 1-5; ZrO 0-2.5; K 2 O或Na 2 O 0.3-1; As 2 O 3 0.2-1和TiO + ZrO2> = 2.5。成分Si2O4（x1），AlPO4（x2），Li2Al2O4（x3），MgAl2O4（x4）和ZnAl2O4（x5）的计算含量xi至少占玻璃的80％，方程5 SIGMA xi DELTA Vi = O约DELTA V1 -10，约DELTA V2。 -5，约DELTA V3。 + 20，约DELTA V4 + 12和+ 10 =满足DELTA V5 20。
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