CN1252391A - Lead-free optic glass - Google Patents

Lead-free optic glass Download PDF

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Publication number
CN1252391A
CN1252391A CN 99125145 CN99125145A CN1252391A CN 1252391 A CN1252391 A CN 1252391A CN 99125145 CN99125145 CN 99125145 CN 99125145 A CN99125145 A CN 99125145A CN 1252391 A CN1252391 A CN 1252391A
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glass
weight
bao
sio
lead
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Granted
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CN 99125145
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Chinese (zh)
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CN1152836C (en
Inventor
U·科尔贝格
D·格拉布斯基
M·温克勒－特鲁德威格
S·沃夫
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Schott AG
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Schott Glaswerke AG
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL 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
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths

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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

Lead-free optical glass having an Abbe number of 36-56 and a refractive index of 1.64-1.83 has the composition (in wt.% based on oxide): 10-25 SiO, 8-20 B2O3, 1-5 ZrO2, 1-5 TiO2, 10-30 La2O3, 30-50 BaO, 0.1-2 ZnO, 0.5-2 CaO, 0.1-2 WO3, 0.1-5 Nb2O5, 0.1-3 Y2O3, 0-1 Gd2O3, 0-1 Na2O, and 0-1 K2O.

Description

Lead-free optic glass
The present invention relates to refractive index n dBetween 1.64 and 1.83, and Abb (abbe number) v dNo aluminium opticglass between 36 and 56.
Because glass ingredient PbO and As 2O 3Be seen in the public at issue as environmental contaminants, in optical device manufacturer, the no lead glass that requirement has various optical properties, and then also preferred no As 2O 3Glass.
Replace plumbous oxide generally can not successfully reproduce optics and the glasswork performance that the desirable PbO of being subjected to influences with one or more components simply.Otherwise, need to form glass and carry out newly developed or do more effective change.
Patent documentation has disclosed the explanation that some optical values come from above-mentioned scope and form similar no lead glass, but these glass have multiple shortcoming.
Patent specification DE 2265703 C2 and US 3,958,999 disclose and have contained B 2O 3-Gd 2O 3-La 2O 3The optical glass of system.These glass need at least 2 weight % to 50 weight % at the most for making the stable Gd of glass devitrification 2O 3This expensive components so to exist in a large number makes these glass very expensive.In specific embodiment, US 3,958, and 999 contain also very expensive component Ta of at least 2 weight % in addition 2O 5
The glass of JP 61-146730 A and JP 60-221338 A need contain Li 2O, it has increased the tendency of they devitrifications.The glass of rear a specification needs the Y of as many as 20 weight % in addition 2O 3La with as many as 52 weight % 2O 3, with the refractive index that obtains to wish, both are expensive component equally; It is uneconomical that this makes these glass costlinesses and pond formula make (tank production).
German patent specification DE 32 01 344 C2 disclose with 15～22 weight %TiO 2+ Nb 2O 5+ Y 2O 3Glass of high refractive index, it contains a high proportion of refractory compound (TiO 2) and expensive components (Nb 2O 5, Y 2O 3) and a large amount of CaO (4～18 weight %), BaO is unique optional member simultaneously, its maximum is 14 weight %.
The objective of the invention is to seek refractive index n dBetween 1.64 and 1.83 and Abb (abbe number) v dLead-free optic glass between 36 and 56, its low cost of manufacture and have good fusion and processing characteristics.This also comprises the crystallization-stable that needs are suitable.
Can reach this purpose by the glass of describing in the claim 1.
These glass contain the glass forming substance SiO of balanced proportions 2(10-25 weight %) and B 2O 3(8-20 weight %).Therefore, the meltability of these glass and their anti-chemistry are all good.The meltability of these glass is because increasing B 2O 3Content and improve, because increasing SiO 2Content and worsen, but contain excessive B 2O 3With their anti-chemistry of infringement.Described minimum B 2O 3The reduction of content will cause the undue increase of glass devitrification tendency.
These glass contain BaO 30～50 weight %.In order to obtain desirable Abb scope, need the BaO of this content.Especially because of the B of the aequum that contains relative BaO content 2O 3And SiO 2, the meltability of these glass is especially good.Except that BaO, these glass also contain the CaO of 0.5～2 weight % and the ZnO of 0.1～2 weight %.They have increased the crystallization-stable of these glass with the existence of BaO.
These glass contain TiO 2And ZrO 2, they account for the ratio of 1～5 weight % respectively.These two kinds of components improve anti-chemistry, especially alkali resistance.When content is higher, will reduce crystallization-stable.
These glass particularly preferably contain the ZrO of similar proportion 2And TiO 2, this can pass through preferred ZrO 2/ TiO 2Weight ratio is 0.8～1.0 expression.
These glass contain the La of 10～30 weight % 2O 3This scope is convenient to the optical states that obtains wishing, especially medium Abb and high refractive index.In addition, La 2O 3Increase the light transmission of glass and promote their crystalline stability.Further increase La 2O 3Content will cause different n dAnd v dValue also unnecessarily makes the batch of this batch more expensive.
In order to change under high index of refraction and critically to adjust low Abbe number, these glass contain 0.1～2 weight %WO 3, 0.1～5 weight % Nb 2O 5And the Y of 0.1～3 weight % 2O 3And also can contain the at the most Gd of 1 weight % 2O 3The total content of these 4 kinds of components is preferably greater than 5 weight %.
In order further to improve meltability, these glass also can contain the Na of 1 weight % at the most 2O and the K of 1 weight % at the most 2O.Higher content will increase the crystallization tendency.In like manner, omit Li fully 2O.
In described compositing range, glass can be divided into two groups according to refractive index:
The refractive index n of first group of glass dBetween 1.64 and 1.75, it contains the SiO of at least 25 weight % 2+ B 2O 3, and contain at most the BaO+La of 60 weight % 2O 3, La wherein 2O 3Maximum level be 25 weight %.
The refractive index n of second group of glass dBetween 1.75 and 1.83.They contain the at the most SiO of 25 weight % 2+ B 2O 3, 10～17 weight % SiO 2B with 8～15 weight % 2O 3, and contain at least the BaO+La of 60 weight % 2O 3, La 2O 3Content be at least 15 weight %.
In the compositing range of main claim, be one group of refractive index n dBetween 1.71 and 1.75 and Abb v dGlass between 42 and 46, distinguishing them is according to their anti-chemical and their crystallization-stable.These glass are composed as follows: SiO 215-21 (especially preferred 15～17); B 2O 310-15 (especially preferred 12～15); ZrO 31-4 (especially preferred 2～3); TiO 21-4 (especially preferred 2～3); Preferred SiO wherein 2+ ZrO 2+ TiO 219-23; La 2O 315-25 (especially preferred 19～22); BaO 30-43 (especially preferred 37～39); ZnO 0.1-1; CaO 0.5-1; Wherein BaO+ZnO+CaO 〉=31 (preferred 37.6～41); WO 30.1-1; Nb 2O 52-5 (especially preferred 2～4); Y 2O 3(0.1-2 especially preferred 0.5～1.5); Gd 2O 30-1; Y wherein 2O 3+ Gd 2O 3〉=0.2 (preferred 〉=0.6～2.5); Na 2O 0-1; K 2O 0-1;
Optical data with glass of described various preferred compositions is n dBetween 1.73 and 1.75, and v dBetween 44 and 46.
SiO 2And B 2O 3The weight ratio ((SiO of sum and BaO, ZnO and CaO sum 2+ B 2O 3)/(BaO+ZnO+CaO)) preferably between 0.5～1.In this scope, glass from crystalline stability especially good.Especially for described preferred (1.71≤n d≤ 1.75,42≤v d≤ 46) glass, ratio≤1 beneficial especially; In them preferred at least 0.5 minimum value be met.Described particularly preferred glass (1.73≤n d≤ 1.75,44≤v d≤ 46) contain these components of equal amount like this, thereby made this ratio satisfy this preferred range feature.
In order to improve the quality of glass, can in this batch in batches, add the habitual known fining agent of measuring own, to clarify these glass, in this way, the inherent quality that these glass relate to no bubble and striped is especially good.
If used fining agent is not As 2O 3, but Sb for example 2O 3, because it may not can reduce the quality of glass, so no lead glass of the present invention does not also contain arsenic.
Preferably, Sb 2O 3Content between 0.1～0.5 weight %.More preferably, except Sb 2O 3, these glass optionally contain in addition 0.5 weight % at the most, have a fluoride of clarification equally.For example add CaF 2The perhaps fluoride of NaF.
Except the optical property of hope, glass of the present invention also has following advantage:
These glass do not contain PbO and also do not contain in preferred embodiments As 2O 3These glass crystallization-stables are good.This can carry out at continuous smelting furnace production.In this production, the tolerance of enough crystalline stability is the viscosity of glass upper limit devitrification.For continuous production, it should 〉=1000dPas.Glass this respect of the present invention is gratifying.Such glass crystalline stability also makes further heat treatment of glass, for example pressurization or again compacting.
These glass not only have good processing properties, and have good melting behaviour.This shows that also they have on about 1300 ℃ fusing point.
These glass have outstanding alkali-resistivity, and they are when having enough general anti-chemical, and the performance of alkali-resistivity rank AR=1 has proved this point.The anti-chemistry of these glass is for further processing to it, for example grinds and polish very important.
Embodiment
Make 9 glass samples of the present invention by habitual raw material.
Table 2 has been listed these glass composition (based on the weight % of oxide compound), refractive index n separately a, Abb v d, the spectrum blue zone local dispersion values (partial dispersion) P G, FWith the local dispersion values Δ of abnormality P G, F[10 -4], density p [g/cm 3], thermalexpansioncoefficient 20/300[10 -6/ K] and glass transformation temperature Tg[℃].
Following manufacturing is according to glass of the present invention: to the frit of oxide compound, be preferably in carbonate or the nitrate raw material and add finings, subsequently this admixtion of thorough mixing.In the smelting furnace of admixtion, melt this admixtion, clarification and homogenizing then well in melt temperature between 1220 ℃～1360 ℃.Cast temperature is about 1050 ℃.
Table 1 has been listed the example of melt.
Table 1 is with the melt example of the glass of double centner calculating
Oxide compound Weight % Raw material Weight (kilogram)
????SiO 2 ????10.0 ????SiO 2 ????9.22
????B 2O 3 ????12.0 ????H 3BO 3 ????19.64
????La 2O 3 ????15.0 ????La 2O 3 ????13.85
????Gd 2O 3 ????0.45 ????Gd 2O 3 ????0.42
????Y 2O 3 ????0.1 ????Y 2O 3 ????0.09
????TiO 2 ????5.0 ????TiO 2 ????4.63
????ZrO 2 ????3.0 ????ZrO 2 ????2.82
????CaO ????0.7 ????CaCO 3 ????1.14
????ZnO ????0.3 ????ZnO ????0.28
????BaO ????50.0 ????BaCO 3 ????40.14
????Ba(NO 3) 2 ????26.22
????WO 3 ????0.6 ????WO 3 ????0.55
????Nb 2O 3 ????2.75 ????Nb 2O 5 ????2.54
????Sb 2O 3 ????0.2 ????Sn 2O 3 ????0.2
The performance of gained glass is listed in table 2, and embodiment 3, embodiment 6 and 7 are the compositions near the limit value of claimed compositing range, and has also represented the central extreme case about specific refractory power and Abb of embodiment.But their physicals is consistent with those performances of the glass of narrower preferred compositing range.
Table 2 glass is formed the key property of (based on the weight % of oxide compound) and described glass
????1 ????2 ????3 ????4 ????5 ????6 ????7 ????8 ????9
????SiO 2 ????16.15 ????20.0 ????10.0 ????20.0 ????16.25 ????11.0 ????24.9 ????10.0 ????16.55
????B 2O 3 ????13.0 ????20.0 ????12.0 ????20.0 ????13.0 ????9.0 ????20.0 ????9.0 ????13.05
????La 2O 3 ????20.8 ????25.0 ????15.0 ????15.0 ????20.7 ????29.0 ????10.0 ????30.0 ????21.8
????Gd 2O 3 ????0.5 ????0.45 ????0.45 ????0.45 ????0.5 ????0.45 ????0.45 ????0.45 ????-
????Y 2O 3 ????1.15 ????0.1 ????0.1 ????0.1 ????1.15 ????1.0 ????0.1 ????0.1 ????0.2
????TiO 2 ????2.7 ????1.0 ????5.0 ????5.0 ????2.7 ????5.0 ????1.0 ????2.0 ????2.75
????ZrO 2 ????2.3 ????1.65 ????3.0 ????2.75 ????2.3 ????5.0 ????1.5 ????2.25 ????2.4
????CaO ????0.7 ????0.7 ????0.7 ????0.7 ????0.7 ????0.7 ????0.7 ????0.7 ????0.7
????ZnO ????0.3 ????0.3 ????0.3 ????0.3 ????0.3 ????0.3 ????0.3 ????0.3 ????0.3
????BaO ????38.2 ????30.0 ????50.0 ????30.0 ????38.2 ????32.75 ????40.0 ????39.5 ????38.1
????WO 3 ????0.6 ????0.6 ????0.6 ????0.6 ????0.6 ????0.6 ????0.6 ????0.6 ????0.6
????Nb 2O 5 ????3.4 ????0.1 ????2.75 ????5.0 ????3.4 ????5.0 ????0.25 ????5.0 ????3.45
????Sb 2O 3 ????0.2 ????0.2 ????0.2 ????0.2 ????0.2 ????0.2 ????0.2 ????0.2 ????0.2
????n d ????1.7434 ????1.6868 ????1.7682 ????1.7130 ????1.7427 ????1.8231 ????1.6574 ????1.7952 ????1.7440
????v d ????44.59 ????52.82 ????40.52 ????42.81 ????44.56 ????37.84 ????54.74 ????41.22 ????44.85
????P g，F ????0.5659 ????0.5509 ????0.5732 ????0.5685 ????0.5659 ????0.5773 ????0.5491 ????0.5700 ????0.5656
????ΔP g，F[10 -4] ????-29 ????-41 ????-24 ????-33 ????-30 ????-29 ????-26 ????-45 ????-27
????ρ[g/cm 3] ????3.74 ????3.95 ????4.50 ????3.80 ????3.73 ????4.26 ????3.74 ????4.77 ????4.30
?α 20/300[10 -6]/K] ????8.05 ????7.85 ????10.51 ????7.25 ????8.02 ????9.25 ????7.64 ????10.47 ????9.10
????Tg[℃] ????676 ????645 ????596 ????646 ????676 ????695 ????648 ????643 ????653

Claims (11)

1, lead-free optic glass, its refractive index n dBetween 1.64 and 1.83 and Abbe number v dBetween 36 and 56, it is characterized in that it has following composition (in the weight % based on oxide), SiO 2 10-25 B 2O 3 8-20 ZrO 2 1-5 TiO 2 1-5 La 2O 3 10-30 BaO 30-50 ZnO 0.1-2 CaO 0.5-2 WO 3 0.1-2 Nb 2O 5 0.1-5 Y 2O 3 0.1-3 Gd 2O 3 0-1 Na 2O 0-1 K 2O 0-1
The habitual fining agent of the habitual amount that randomly contains.
2, according to the no aluminium opticglass of claim 1, its refractive index n dBetween 1.64 and 1.75, it is characterized in that it has following composition (in the weight % based on oxide compound), ????SiO 2 ????10-25 ????B 2O 3 ????8-20 SiO wherein 2+B 2O 3 ????≥25 ????ZrO 2 ????1-5 ????TiO 2 ????1-5 ????La 2O 3 ????10-25 ????BaO ????30-50 La wherein 2O 3+BaO ????≤60 ????ZnO ????0.1-2 ????CaO ????0.5-2 ????WO 3 ????0.1-2 ????Nb 2O 5 ????0.1-5 ????Y 2O 3 ????0.1-3 ????Gd 2O 3 ????0-1 ????Na 2O ????0-1 ????K 2O ????0-1
The habitual finings that randomly contains habitual amount.
3, according to the lead-free optic glass of claim 1, its refractive index n dBetween 1.75 and 1.83, it is characterized in that it has following composition (in the weight % based on oxide compound), ????SiO 2 ????10-17 ????B 2O 3 ????8-15 SiO wherein 2+B 2O3 ????≤25 ????ZrO 2 ????1-5 ????TiO 2 ????1-5 ????La 2O 3 ????10-30 ????BaO ????30-50 La wherein 2O 3+BaO ????≥60 ????ZnO ????0.1-2 ????CaO ????0.5-2 ????WO 3 ????0.1-2 ????Nb 2O 5 ????0.1-5 ????Y 2O 3 ????0.1-3 ????Gd 2O 3 ????0-1 ????Na 2O ????0-1 ????K 2O ????0-1
The habitual finings that randomly contains habitual amount.
4, according to the lead-free optic glass of claim 1, its refractive index n dBetween 1.71 and 1.75 and Abb v dBetween 42 and 46, it is characterized in that it has following composition (in the weight % based on oxide compound), ????SiO 2 ????15-21 ????B 2O 3 ????10-15 ????ZrO 2 ????1-4 ????TiO 2 ????1-4 ????La 2O 3 ????15-25 ????BaO ????30-43 ????ZnO ????0.1-1 ????CaO ????0.5-1 BaO+ZnO+CaO wherein ????≥31 ????WO 3 ????0.1-1 ????Nb 2O 5 ????2-5 ????Y 2O 3 ????0.1-2 ????Gd 2O 3 ????0-1 Y wherein 2O 3+Gd 2O 3 ????≥0.2 ????Na 2O ????0-1 ????K 2O ????0-1
5, according to the lead-free optic glass of claim 4, it is characterized in that described weight ratio is Si O 2 + B 2 O 3 BaO + ZnO + CaO ﹠le; 1
6, according to the lead-free optic glass of claim 4, its refractive index n dBetween 1.73 and 1.75 and Abbe number v dBetween 44 and 46, it is characterized in that it has following composition (in the weight % based on oxide), SiO 2 15-17 B 2O 3 12-15 ZrO 2 2-3 TiO 2 2-3 La 2O 3 19-22 BaO 37-39 ZnO 0.1-1 CaO 0.5-1 WO 3 0.1-1 Nb 2O 5 2-4 Y 2O 3 0.5-1.5 Gd 2O 3 0-1 Y wherein 2O 3+ Gd 2O 3 〉=0.6
7, according at least one no aluminium optical glass in the claim 1 to 6, it is characterized in that WO 3+ Nb 2O 5+ Y 2O 3+ Gd 2O 3＞5 weight %.
8, according at least one lead-free optic glass in the claim 1 to 7, it is characterized in that ZrO 2/ TiO 2Weight ratio between 0.8 and 1.0.
9, according at least one no aluminium optical glass in the claim 1 to 8, it is characterized in that described glass contains the Sb of 0.1～0.5 weight % 2O 3
10, according at least one lead-free optic glass in the claim 1 to 9, it is characterized in that described glass contains the fluorochemical of 0.5 weight % at the most.
11, according at least one no aluminium opticglass in the claim 1 to 10, it is characterized in that, they except unavoidable impurities, oxygen-free arsenic
CNB991251458A 1998-10-19 1999-10-19 Lead-free optic glass Expired - Lifetime CN1152836C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19848077.6 1998-10-19
DE1998148077 DE19848077C1 (en) 1998-10-19 1998-10-19 Lead-free optical glass

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CN1252391A true CN1252391A (en) 2000-05-10
CN1152836C CN1152836C (en) 2004-06-09

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JP (1) JP3347106B2 (en)
CN (1) CN1152836C (en)
DE (1) DE19848077C1 (en)
FR (1) FR2784676B1 (en)
GB (1) GB2342918B (en)
HK (1) HK1029098A1 (en)
MY (1) MY124408A (en)

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DE19848077C1 (en) 2000-01-27
JP3347106B2 (en) 2002-11-20
CN1152836C (en) 2004-06-09
GB2342918B (en) 2001-04-18
GB9922412D0 (en) 1999-11-24
GB2342918A (en) 2000-04-26
FR2784676B1 (en) 2002-07-19
FR2784676A1 (en) 2000-04-21
HK1029098A1 (en) 2001-03-23
MY124408A (en) 2006-06-30
JP2000128568A (en) 2000-05-09

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