CN1203015C - 低膨胀系数的光学玻璃 - Google Patents

低膨胀系数的光学玻璃 Download PDF

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CN1203015C
CN1203015C CN 03117367 CN03117367A CN1203015C CN 1203015 C CN1203015 C CN 1203015C CN 03117367 CN03117367 CN 03117367 CN 03117367 A CN03117367 A CN 03117367A CN 1203015 C CN1203015 C CN 1203015C
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expansion
glass
high temperature
coefficient
temperature viscosity
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CN1431160A (zh
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刘茂福
陈筱丽
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CDGM Glass Co Ltd
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Guangming Photoelectricity And Information Materials Co Ltd Chengdu
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • C03C3/076Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089Glass compositions containing silica with 40% to 90% silica, by weight containing boron

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

本发明提供了一种低膨胀系数的光学玻璃,所述玻璃的组成成分包括MgO为1~5%,K2O为5~10%,不超过3.5%的TiO2,B2O3为15~25%,Na2O为1~5%,ZnO为5~13%,SiO2为60~65%。根据上述配方制成的玻璃不仅具有膨胀系数α≤49×10-7/℃,折射率为1.500~1.520,并且高温粘度小,适合于池炉连续生产。

Description

低膨胀系数的光学玻璃
技术领域
本发明涉及一种具有低膨胀系数的光学玻璃。
背景技术
由于Al2O3在玻璃中具有负的膨胀系数及部分折射率为1.520的值,因而制造具有低膨胀系数且折射率为1.500~1.520的玻璃,一般均采用SiO2-B2O3-Al2O3-Na2O系统,如配方:SiO2:64%,B2O3:12.2%,Al2O3:4.0%,Na2O:7.8%,ZnO:11.1%,但由于SiO2和Al2O3都属于难熔成份,要使膨胀系数α≤49×10-7/℃,碱金属含量就必须很低,因而玻璃的高温粘度很大,难以生产出气泡、条纹等质量指标达到标准的玻璃。
发明内容
本发明的目的是提供一种玻璃,它不仅具有膨胀系数α≤49×10-7/℃,折射率为1.500~1.520,并且高温粘度小,适合于池炉连续生产。
本发明解决技术问题的技术方案是:一种低膨胀系数的光学玻璃,它的组成成分的重量百分比组成包括:MgO为1~5%,K2O为5~10%,不超过3.5%的TiO2,B2O3为15~25%,Na2O为1~5%,ZnO为5~13%,SiO2为60~65%。
本发明的有益效果是:由于加入了助熔的K2O和降低高温粘度的MgO,并去掉了原有配方中难熔的Al2O3,通过适当调节其它成份的配方,得到了具有膨胀系数α≤49×10-7/℃,折射率为1.500~1.520,并且高温粘度小的玻璃配方。
具体实施方式
SiO2和B2O3是玻璃生成体,SiO2在玻璃中具有低折射率、低膨胀系数及大的高温粘度的性质,实验证明,当SiO2>65%时,玻璃的高温粘度特大,不利于生产,而当SiO2<60%时,又难以获得膨胀系数α≤49×10-7/℃的玻璃。B2O3在玻璃中性质比较复杂,在本发明中,它主要起助熔剂的作用,以降低高温粘度,通过试验,B2O3含量为15~25%为适度。
K2O和Na2O是作为助熔剂加入的。K2O+Na2O的含量高有利于降低高温粘度,同时当K2O+Na2O的含量增加,其膨胀系数α也急剧增加,且折射率值也随之上升。在本发明中,当K2O+Na2O>13%,则膨胀系数α>49×10-7/℃,而K2O+Na2O<6%时,则玻璃的高温粘度很大,因此,其合适的量为6~13%。
MgO在碱金属、碱土金属氧化物中具有最小的部份膨胀系数值,并且具有降低高温粘度的作用,因此,适当引入可改善玻璃的物化性能,降低高温粘度,其合适的含量为1~5%。
ZnO在本发明中具有较好的助熔效果,其膨胀系数部份值为50×10-7/℃,与玻璃膨胀系数目标值α≤49×10-7/℃接近,但因其折射率的部份值高达1.705,远比玻璃目标值1.500~1.520高,因此,当ZnO含量<5%时,其助熔效果不明显,而当ZnO>13%时,其折射率值将>1.520。
TiO2主要起降低玻璃膨胀系数的作用。
本发明的具体实施例与原配方的各项指标对比如下表,其中各组份的数值为重量百分比值。
    实施例     1     2     3     4     5     原配方
    SiO2     65     61     63     60     62     64.4
    B2O3     15     22     18.5     21     18.2     12.2
MgO 1 2 3 2 3.3     4.0(Al2O3的含量)
    K2O     5.5     7     5     6     7     /
    Na2O     2     2     4     1     3     7.8
    ZnO     11     5     5     9     6     11.1
    TiO2     0.5     1     1.5     1     0.5     /
    N     1.506     1.518     1.519     1.510     1.505     1.508
    α(×10-7/℃) 45 47 48 48 49 49
    1300℃时高温粘度daps 800 290 570 270 330 1180
    1400℃时高温粘度daps 310 210 265 131 151 554
    1500℃时高温粘度daps 170 73 130 69 76 295
由上表可以看出:玻璃在1300~1500℃时的高温粘度相对原配方大大地降低,并且保证了其膨胀系数α≤49×10-7/℃,折射率达到1.500~1.520。

Claims (2)

1.一种低膨胀系数的光学玻璃,它的组成成分的重量百分比组成包括:MgO为1~5%,K2O为5~10%,不超过3.5%的TiO2,B2O3为15~25%,Na2O为1~5%,ZnO为5~13%,SiO2为60~65%。
2.按照权利要求1所述的低膨胀系数的光学玻璃,其特征在于:所述K2O和Na2O的重量之和的百分比为6~13%。
CN 03117367 2003-02-28 2003-02-28 低膨胀系数的光学玻璃 Expired - Lifetime CN1203015C (zh)

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CN1203015C true CN1203015C (zh) 2005-05-25

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US20050049135A1 (en) * 2003-08-29 2005-03-03 Kazutaka Hayashi Precision press-molding glass preform, optical element and processes for the production thereof

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