CN110272205A - A kind of borosilicate glass and its preparation method and application - Google Patents
A kind of borosilicate glass and its preparation method and application Download PDFInfo
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- CN110272205A CN110272205A CN201910563716.5A CN201910563716A CN110272205A CN 110272205 A CN110272205 A CN 110272205A CN 201910563716 A CN201910563716 A CN 201910563716A CN 110272205 A CN110272205 A CN 110272205A
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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
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
Abstract
The present invention provides a kind of borosilicate glasses, and in percentage by weight, the borosilicate glass compositions include following formula composition: 67~80% SiO2, 4~10% Al2O3, 6~13% B2O3, 3~15% R2O, 0.5~7% XO；Wherein, the R2O is Na2O and K2The mixture of O；The XO is the mixture of MgO, CaO and SrO, R2The weight ratio of O and XO is (2~5): 1；Na2O and K2The weight ratio of O is (1~6): 1；1% < (CaO+SrO-MgO) < 3%；β-OH content is 0.01~0.3/mm in the borosilicate glass.Borosilicate glass internal structure of the invention is even closer, and the fusion temperature of glass is lower, and boron volatility is low, improves the thermal shock resistance properties of glass, improves the chemical stability of glass.
Description
Technical field
The present invention relates to glass manufacturing areas more particularly to a kind of borosilicate glass and its preparation method and application.
Background technique
Borosilicate glass is anti-from laboratory glass wares to building since its excellent performance is widely used and is developed
Flint glass all applies borosilicate glass from chemical field to photoelectric field etc. from vessel cooker glass to display glass.
Borosilicate glass refers to that basis is SiO2、B2O3、Na2The glass of O, sodium oxide molybdena, which provides free oxygen, makes boron oxygen
Triangle body [BO3] it is changed into boron oxygen tetrahedron [BO4], the structure of boron is changed into rack-like by stratiform, is SiO2、B2O3Form uniform one
The glass of cause creates conditions, B2O3With [BO3] or [BO4] enter glass structure, especially when with [BO4] and [SiO4] collectively constitute knot
When network forming network, glass network structure integrality and tightness degree increase, and the borosilicate glass made has excellent chemical stabilization
Property, thermal stability, the coefficient of expansion be low, mechanical performance.
Borosilicate glass has many excellent performances, but exists simultaneously many problems in fusing and forming process:
Fusion temperature is excessively high, high temperature viscosity is big, settling time is long, bubble is more, boron volatile (volatility 12% or so), easy split-phase and point
Layer etc..These problems all significantly limit the production development and application of borosilicate glass, while proposing to production technology
Higher requirement.
Summary of the invention
The purpose of the present invention is to provide a kind of borosilicate glasses and its preparation method and application, it is intended to solve existing skill
The problem that borosilicate glass boron volatility is high in art, fusion temperature is excessively high, high temperature viscosity is big.
For achieving the above object, The technical solution adopted by the invention is as follows:
A kind of borosilicate glass, in percentage by weight, the borosilicate glass include following components:
Wherein, R2O is Na2O and K2The weight hundred of the mixture of O, the mixture of XO MgO, CaO and SrO, and each component
Divide in content,
R2The weight ratio of O and XO is (2~5): 1；
Na2O and K2The weight ratio of O is (1~6): 1；
1% < (CaO+SrO-MgO) < 3%；
β-OH content is 0.01~0.3/mm in the borosilicate glass.
Optionally, β-OH content is 0.1~0.2/mm in the borosilicate glass.
Optionally, in the borosilicate glass, in percentage by weight, Na2The weight percentage of O be 2.5~
10%, K2The weight percentage of O is 0.5~5%.
Optionally, in the borosilicate glass, in percentage by weight, the weight percentage of MgO is 0.05~
The weight percentage that the weight percentage of 2%, CaO are 0.25~3%, SrO is 0.2~2%.
Optionally, the volatility of the borosilicate glass boron is 7.11%~8.85%.
Optionally, the glass expansion coefficient of the borosilicate glass is 48 × 10-7/ DEG C~60 × 10-7/℃。
Optionally, 1030 DEG C of the devitrification of glass temperature < of the borosilicate glass.
Optionally, 1650 DEG C of fusion temperature < when the borosilicate glass glass viscosity 200 is moored.
And a kind of preparation method of borosilicate glass, include the following steps:
Following component in percentage by weight is provided:
Wherein, R2O is Na2O and K2The weight hundred of the mixture of O, the mixture of XO MgO, CaO and SrO, and each component
Divide in content,
R2The weight ratio of O and XO is (2~5): 1；
Na2O and K2The weight ratio of O is (1~6): 1；
1% < (CaO+SrO-MgO) < 3%；
The raw material components are mixed, are melted, are clarified, are annealed, forms the borosilicate glass is prepared；
β-OH content is 0.01~0.3/mm in the preparation process.
Optionally, during the preparation process, controlling β-OH content in the borosilicate glass is 0.01~0.2/mm.
And borosilicate glass as described above is as medical container or electric light source glass tube or solar energy vacuum heat collecting
The application of pipe or other glass containers.
Compared with prior art, borosilicate glass of the invention, component ratio in borosilicate glass described in strict control
Example limits and β-OH content is 0.01~0.3/mm, make the volatility 7.11% of the borosilicate glass boron being prepared~
8.85%, glass expansion coefficient is 48 × 10-7/ DEG C~60 × 10-7/ DEG C, the fusion temperature < 1650 when glass viscosity 200 is moored
℃.Borosilicate glass internal structure is even closer, and the fusion temperature of glass is lower, guarantees the water resistance of glass, improves glass
Thermal shock resistance properties, improve the chemical stability of glass, be effectively reduced the volatility of boron.
Specific embodiment
To keep the purpose, technical solution and technical effect of the embodiment of the present invention clearer, the present invention will be implemented below
Technical solution in example is clearly and completely described, it is clear that and described embodiments are some of the embodiments of the present invention, and
The embodiment being not all of.In conjunction with the embodiment in the present invention, those of ordinary skill in the art are not making creative work
Under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
Present example provides a kind of borosilicate glass, and in percentage by weight, the borosilicate glass includes
Following components:
Wherein, R2O is Na2O and K2The weight hundred of the mixture of O, the mixture of XO MgO, CaO and SrO, and each component
Divide in content,
R2The weight ratio of O and XO is (2~5): 1；
Na2O and K2The weight ratio of O is (1~6): 1；
1% < (CaO+SrO-MgO) < 3%；
β-OH content is 0.01~0.3/mm in the borosilicate glass.
Specifically, in percentage by weight, SiO in the borosilicate glass2Weight content be 67~80%.Two
Silica (SiO2) it is one of the ingredient for constituting glass network, it is the main constituents of glass.If SiO2Weight content mistake
It is few, then it will affect the quality of glass product, decline the chemical durability of glass product.If SiO2Weight content it is excessive, then
Glass phosphoric acid obtained in preparation process declines, and is easy to happen devitrification in manufacturing process, influences glass finished-product.
Specifically, in percentage by weight, Al in the borosilicate glass2O3Weight content be 4~10%, institute
The Al of addition2O3, mainly in conjunction with free oxygen, form [AlO4] tetrahedral structure, the tetrahedral structure of formation can make glass
Internal structure is even closer, inhibits the devitrification of glass and improves the chemical durability and hydrolytic resistance of glass, improves the change of glass
Learn stability.If Al2O3Weight content it is very few, then can not inhibit glass devitrification, and can not improve glass chemical durability and
Hydrolytic resistance；If Al2O3Weight content it is excessive, then [AlO in glass4] content increase, further result in inside glass structure
Loosely become larger, the viscosity of glass is caused to rise, strain point temperature is got higher, and is caused following process temperature excessively high, not can guarantee glass
Hydrolytic resistance and chemical durability.
Specifically, in percentage by weight, B in the borosilicate glass2O3Additive amount be 6~13%, addition
B2O3With boron oxygen triangle body [BO3] it is leading ion, it is changed into boron oxygen tetrahedron [BO under the action of free oxygen4], the structure of boron
Rack-like is changed by stratiform, is SiO2、B2O3It forms uniform glass to create conditions, B2O3With [BO3] or [BO4] enter glass
Glass structure, especially when with [BO4] and [SiO4] when collectively constituting structural network, glass network structure integrality and tightness degree increase
Add, the borosilicate glass made has excellent chemical stability, reduces fusion temperature, strain point temperature, the softening temperature of glass
Degree inhibits glass devitrification, improves the thermal shock resistance properties and chemical stability of glass.If B2O3Content it is very few, then make glass web
Network structural intergrity and close effect are unobvious, and fusion temperature, strain point temperature of reduced glass etc. are unobvious, can not
Preferably improve the thermal shock resistance properties and chemical stability of glass.If B2O3Content it is excessive, then the glass product being prepared is resistance to
Aqueous, chemical durability decline.
Specifically, in percentage by weight, R in the borosilicate glass2The additive amount 3~15% of O.R2O is referred to
Alkali metal oxide, the R2O is Na2O and K2The mixture of O.Add the Na2O and K2O mixture can make the height of glass
Warm viscosity decline, and increase glass thermal linear expansion coefficient, it is capable of the property of stabilized glass.
In a preferred embodiment of the invention, in percentage by weight, Na in the borosilicate glass2The weight hundred of O
Dividing content is 2.5~10%, the K2The weight percentage of O is 0.5~5%, guarantees Na2O and K2The adding proportion of O, can
The high temperature viscosity of glass decline for ensuring to be prepared, softening point reduce, the property of stabilized glass.If Na2The content of O is very few, glass
Glass fusion temperature reduces unobvious；If Na2The content of O is excessive, then water resistance declines, and glass product property is unstable.If K2O's
Content is excessive, then water resistance declines, and it is unstable to will lead to glass product property.
Specifically, in percentage by weight, the additive amount of XO is 0.5~7% in the borosilicate glass；What XO referred to
It is alkaline earth oxide, wherein the XO is the mixture of MgO, CaO and SrO.Specifically, add described MgO, CaO and
SrO mixture has and improves glass chemistry durability, reduces the effect of the high temperature viscosity of glass.If MgO, CaO and SrO are mixed
The content of object is excessive, and glass is easy crystallization, and glass property is unstable.If the content of MgO, CaO and SrO mixture is very few, nothing
Method improves the water resistance of glass, and glass properties is unstable.
In a preferred embodiment of the invention, in percentage by weight, in the borosilicate glass MgO weight percent
The weight percentage that the weight percentage that content is 0.05~2%, CaO is 0.25~3%, SrO is 0.2~2%.Into one
Step is preferred, to guarantee being melted for subsequent glass, the forming of glass and the chemical stability of glass, preferred Na2O and K2O's
Weight ratio is (1~6): 1；1<CaO+SrO-MgO<3.
It is considered that alkali and alkaline earth metal ions are to glass transition temperature, crystallization property, and the influence to boron volatile performance
(glass batch generates the different type borate of lanthanum, relative to alkali metal oxide, alkaline-earth metal during heating
The borate that oxide combines generation with boron has lower saturated vapor pressure), R2O/XO is (2~5): 1.
β-OH value is used as the index for measuring the moisture content in glass, β~OH=(1/X) log (T1/T2).Wherein,
X: the thickness (mm) of glass plate；
T1: in reference wavelength 3846cm-1Transmitance (%) at (2600nm)；
T2: in hydroxyl absorbing wavelength 3600cm-1Transmitance (%) at (2800nm), the transmitance being related to can be used
Fourier converts infrared spectrum analyzer (FT-IR) measurement.
The control of β~OH value in borosilicate glass can be accomplished by the following way: (1) selecting water content low
Raw material；(2) addition makes the ingredient of the amount of moisture reduction in glass (such as addition Cl, SO3Deng)；(3) make the moisture in furnace inner environment
Amount reduces；(4) N is carried out in melten glass2Blistering；(5) small-sized melting furnace is used；(6) accelerate the flow of melten glass；(7)
Using electric smelting method.
Specifically, β-OH content is 0.01~0.3/mm in the borosilicate glass, in a preferred embodiment of the invention,
Controlling β-OH content in the borosilicate glass is 0.1~0.2/mm.Further control β-OH in the borosilicate glass
Content is 0.1~0.2/mm, and borosilicate glass can be made to have suitable fusion temperature, and obtained glass is not easy crystallization,
Boron volatility is low, and glass property is stablized.
The volatility of the borosilicate glass boron is 7.11%~8.85%, the glass swelling of the borosilicate glass
Coefficient is 48 × 10-7/ DEG C~60 × 10-7/℃；1030 DEG C of the devitrification of glass temperature < of the borosilicate glass；The borosilicate
1650 DEG C of fusion temperature < when the glass viscosity 200 of silicate glass is moored.
Compared with prior art, borosilicate glass of the invention, component ratio in borosilicate glass described in strict control
Example and β-OH content are 0.01~0.3/mm, make the volatility 7.11% of the borosilicate glass boron being prepared~
8.85%, glass expansion coefficient is 48 × 10-7/ DEG C~60 × 10-7/ DEG C, the fusion temperature < 1650 when glass viscosity 200 is moored
℃.Borosilicate glass internal structure is even closer, and the fusion temperature of glass is lower, guarantees the water resistance of glass, improves glass
Thermal shock resistance properties, improve the chemical stability of glass, be effectively reduced the volatility of boron.
Correspondingly, the embodiment of the invention also provides a kind of preparation methods of borosilicate glass.This method includes as follows
Step:
S01. raw material is provided, in percentage by weight, component is as follows for raw material:
Wherein, R2O is Na2O and K2The weight hundred of the mixture of O, the mixture of XO MgO, CaO and SrO, and each component
Divide in content,
R2The weight ratio of O and XO is (2~5): 1；
Na2O and K2The weight ratio of O is (1~6): 1；
1% < (CaO+SrO-MgO) < 3%.
S02. the raw material components mixed, melted, being clarified, being annealed, formed the borosilicate glass is prepared
Glass；β-OH content is 0.01~0.3/mm during the preparation process.
In a preferred embodiment of the invention, in order to enable boron volatility is less, it is preferable that during the preparation process control β~
OH value is 0.1~0.2/mm.
It is above-mentioned that the raw material components are mixed, are melted, are clarified, are annealed, forms the borosilicate glass is prepared
Glass is the normal process steps in glass technology field, not reinflated herein to repeat.
The method that the present invention prepares borosilicate glass, in borosilicate glass described in strict control component ratio limit with
And β-OH content is 0.01~0.3/mm, makes the volatility 7.11%~8.85% of borosilicate glass boron being prepared,
Glass expansion coefficient is 48 × 10-7/ DEG C~60 × 10-7/ DEG C, 1650 DEG C of fusion temperature < when glass viscosity 200 is moored.Borosilicate
Silicate glass internal structure is even closer, and the fusion temperature of glass is lower, guarantees the water resistance of glass, improves the thermal shock of glass
Performance improves the chemical stability of glass, is effectively reduced the volatility of boron.
Borosilicate glass of the present invention can be used as medical container or electric light source glass tube or solar energy vacuum heat collecting
The application of pipe or other glass containers.Medical container of the present invention with or the pyrex of electric light source glass tube adopt
It is prepared with danner process or the dimension any method of network method.
Technical solution in order to better illustrate the present invention, is illustrated combined with specific embodiments below.
To save length, the component of the borosilicate glass of comparative example 1~6 and Examples 1 to 8 is recited in table 1,2.
According to the glass ingredient that table 1,2 designs, then glass raw material needed for calculating is carried out as follows preparation:
According to design glass ingredient, glass raw material needed for calculating, clarifying agent uses NaNO3And CeO2, the two ratio satisfaction
9:1, additive amount are the 0.08% of batch total amount.Glass raw material is uniformly mixed, is controlled according to the β-OH content in table
β-OH content in glass.Batch is poured into platinum-rhodium crucible, under 1640 DEG C of fusion temperatures, heat preservation melting 16 hours is obtained
To glass metal.Glass metal is poured into stainless steel mould and is formed, then insulation annealing 2 hours at 600 DEG C, it is then cold with furnace.
Then glass sample is cut, polishes, glass properties is tested according to above-mentioned requirements.
The glass sample that above-mentioned comparative example 1~6 and Examples 1 to 8 are prepared is tested for the property respectively, wherein
The thermal expansion coefficient of the glass " measures solid material linear thermal expansion with suprasil dilatometer according to ASTM E228-1985
Test method " measurement obtain；High temperature viscosity of glass curve is tested using rotation high-temperature viscosimeter by ASTM C965, wherein
It is T2 that viscosity 200, which moors corresponding temperature,；Devitrification of glass temperature is tested using temperature gradient furnace method by ASTM C829；The content of boron can
To be tested by ICP；Chemical stability test: sheet glass is placed for 24 hours in 95 DEG C of 5%HCI；20 DEG C of 10%HF is molten
10min is placed in liquid；The acid resistance of glass loss amount characterization glass.3h, glass are placed in 95 DEG C of sheet glass of 5%NaOH solution
The alkali resistance of loss amount characterization glass.
Specifically, the glass sample that above-mentioned comparative example 1~6 is prepared is tested for the property, test result is as follows table
1；The glass sample that Examples 1 to 8 is prepared is tested for the property, as a result such as the following table 2,
Table 1
Table 2
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 | |
| SiO2 | 67.17 | 69.97 | 71.24 | 73.19 | 75.12 | 75.03 | 76.52 | 79.12 |
| Al2O3 | 9.83 | 7.27 | 5.02 | 4.24 | 5.01 | 5.64 | 6.59 | 4.55 |
| B2O3 | 8.3 | 10.01 | 8.02 | 12.91 | 9.12 | 6.15 | 6.3 | 8.93 |
| Na2O | 6.84 | 7.14 | 9.92 | 4.74 | 6.13 | 6.12 | 5.31 | 3.01 |
| K2O | 4.91 | 3.36 | 2.26 | 1.02 | 1.12 | 1.73 | 2.22 | 0.73 |
| Na2O+K2O | 11.75 | 10.5 | 12.18 | 5.76 | 7.25 | 7.85 | 7.53 | 3.74 |
| Na2O/K2O | 1.39 | 2.13 | 4.39 | 4.65 | 5.47 | 3.54 | 2.39 | 4.12 |
| MgO | 0.95 | 0.09 | 0.54 | 1.43 | 0.52 | 1.85 | 0.96 | 0.52 |
| CaO | 0.32 | 1.23 | 1.25 | 0.69 | 1.45 | 2.61 | 1.85 | 2.06 |
| SrO | 1.68 | 0.93 | 1.75 | 1.78 | 1.53 | 0.87 | 0.25 | 1.08 |
| MgO+CaO+SrO | 2.95 | 2.25 | 3.54 | 3.9 | 3.5 | 5.33 | 3.06 | 3.66 |
| CaO+SrO-MgO | 1.05 | 2.07 | 2.46 | 1.04 | 2.46 | 1.63 | 1.14 | 2.62 |
| R2O/XO | 3.98 | 4.67 | 3.44 | 1.48 | 2.07 | 1.47 | 2.46 | 1.02 |
| β-OH content | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Boron content/% | 7.71 | 9.21 | 7.37 | 11.81 | 8.42 | 5.67 | 5.84 | 8.14 |
| Boron volatility/% | 7.11 | 7.99 | 8.10 | 8.52 | 7.68 | 7.80 | 7.30 | 8.85 |
| T2/℃ | 1629 | 1638 | 1625 | 1611 | 1636 | 1622 | 1644 | 1619 |
| Softening point/DEG C | 798 | 792 | 776 | 765 | 779 | 783 | 790 | 781 |
| Density (g/cm3) | 2.34 | 2.37 | 2.35 | 2.32 | 2.39 | 2.38 | 2.31 | 2.32 |
| The coefficient of expansion (× 10-7/℃) | 51.7 | 51.8 | 53.2 | 48.9 | 52.5 | 56.6 | 59.8 | 48.9 |
| HCI-5%, for 24 hours, 95 DEG C of (mg/cm2) | 0.678 | 0.594 | 0.672 | 0.658 | 0.617 | 0.645 | 0.875 | 0.698 |
| HF-10%, 10min, 20 DEG C of (mg/cm2) | 15.438 | 16.167 | 17.245 | 16.278 | 17.174 | 17.586 | 16.345 | 17.574 |
| NaOH-5%, 3h, 95 DEG C of (mg/cm2) | 2.556 | 2.895 | 3.647 | 3.596 | 3.167 | 2.883 | 4.276 | 3.872 |
The present invention claims preparations it is found that each material composition ratio added by comparative example 1~6 exceeds for the data of consolidated statement 1
Obtained glass sample performance is poor.
R in comparative example 12O=16.58, Na2O/K2O=3.53, RO=2.14, CaO+SrO-MgO=1.06, R2O/
RO=7.75, R2O and R2O/RO exceed the present invention claims.1 glass boron volatility of comparative example is 14.34, and resistance toization of glass
It is lower to learn stability.
R in comparative example 22O=10.09, Na2O/K2O=2.23, RO=8.28, CaO+SrO-MgO=3.2, R2O/
RO=1.22, RO and CaO+SrO-MgO exceed the present invention claims.2 devitrification of glass temperature of comparative example and glass softening point temperature
Degree is higher, unfavorable to glass production.
R in comparative example 32O=7.59, Na2O/K2O=49.6, RO=2.77, CaO+SrO-MgO=2.01, R2O/
RO=2.74, RR2O/RO exceed the present invention claims.3 glass melting temperature of comparative example is higher, the fusing of glass difficulty or ease.
R in comparative example 42O=10.19, Na2O/K2O=2.5, RO=6.72, CaO+SrO-MgO=-1.54, R2O/
RO=1.52, RO exceed the present invention claims.4 devitrification of glass temperature of comparative example and glass softening point temperature are higher, to glass
It is unfavorable to produce and process.
R in comparative example 52O=12.79, Na2O/K2O=3.46, RO=2.23, CaO+SrO-MgO=1.06, R2O/
RO=5.51, R2O/RO exceed the present invention claims.5 glass chemical-resistant stability of comparative example is poor.
R in comparative example 62O=3.89, Na2O/K2O=3.47, RO=5.13, CaO+SrO-MgO=1.87, R2O/
RO=0.76, R2O/RO exceed the present invention claims.6 devitrification of glass temperature of comparative example and glass softening point temperature are higher, right
Glass production is unfavorable.
The data of consolidated statement 2 it is found that the glass sample component proportion that is prepared of Examples 1 to 8 the present invention claims it
Interior, the glass sample β-OH content being prepared is 0.2%；Boron content is 5.67%~11.81%, the volatility of boron
It is 7.11%~8.85%, volatility is lower and volatility is stablized, and can guarantee the content of boron element；Glass expansion coefficient is 48
×10-7/ DEG C~60 × 10-7/℃；Acid-proof alkaline is good；Temperature T2 when viscosity 200 is moored is below 1650 DEG C, and softening temperature is
765 DEG C -792 DEG C, temperature is lower, and glass meltability is good；1030 DEG C of devitrification of glass temperature is hereinafter, glassware is suitble to subsequent add
Work uses.Glassware is suitble to danner process, dimension network method forming.
Influence of the content to glass product of β-OH in glass is further analyzed, as an example with embodiment 3 and embodiment 5
It is further illustrated.
Concrete outcome is as described in Table 3:
Table 3
According to the data in above-mentioned table 3 it is found that with β-OH value in glass increase, glass viscosity reaches the temperature of 200 pools
Degree T2 is gradually decreased, crystallization temperature reduces, the coefficient of expansion increases, softening point reduces and boron volatile quantity gradually increases.In conjunction with glass
The variation of performance and the requirement (fusion temperature is suitable, and glass is not easy crystallization, and glass quality is stablized) of production technology, preferred glass
β-the OH of glass is in 0.1~0.2/mm.
It can be obtained by table 1~3, be " SiO in glass ingredient267~80%, Al2O34~10%, B2O36~13%, R2O
3~15%, XO 0.5~7%, wherein R2O is Na2O and K2The mixture of O, the mixture of XO MgO, CaO and SrO, and it is each
In the weight percentage of component, R2The weight ratio of O and XO is (2~5): 1；Na2O and K2The weight ratio of O is (1~6): 1；1%
< (CaO+SrO-MgO) < 3%；" on the basis of, can control β-OH content in borosilicate glass is 0.01~0.3/mm,
And the volatility of boron is 7.11%~8.85%, has better inhibiting effect to boron volatility, guarantees the life of borosilicate glass
It produces and applies.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of borosilicate glass, which is characterized in that in percentage by weight, the borosilicate glass includes with the following group
Point:
Wherein, R2O is Na2O and K2The mixture of O, the mixture of XO MgO, CaO and SrO,
And in the weight percentage of each component,
R2The weight ratio of O and XO is (2~5): 1；
Na2O and K2The weight ratio of O is (1~6): 1；
1% < (CaO+SrO-MgO) < 3%；
β-OH content is 0.01~0.3/mm in the borosilicate glass.
2. borosilicate glass according to claim 1, which is characterized in that β-OH content is in the borosilicate glass
0.1~0.2/mm.
3. borosilicate glass according to claim 1, which is characterized in that in the borosilicate glass, according to weight
Percentages, Na2The weight percentage of O is 2.5~10%, K2The weight percentage of O is 0.5~5%.
4. borosilicate glass according to claim 1, which is characterized in that in the borosilicate glass, according to weight
Percentages, the weight percentage of MgO are that the weight percentage of 0.05~2%, CaO is the weight of 0.25~3%, SrO
Percentage composition is 0.2~2%.
5. borosilicate glass according to any one of claims 1 to 4, which is characterized in that the borosilicate glass boron
Volatility is 7.11%~8.85%.
6. borosilicate glass according to any one of claims 1 to 4, which is characterized in that the glass of the borosilicate glass
The glass coefficient of expansion is 48 × 10-7/ DEG C~60 × 10-7/℃。
7. borosilicate glass according to any one of claims 1 to 4, which is characterized in that the glass of the borosilicate glass
1030 DEG C of glass crystallization temperature <；And/or
1650 DEG C of fusion temperature < when the glass viscosity 200 of the borosilicate glass is moored.
8. a kind of preparation method of borosilicate glass, includes the following steps:
Following component in percentage by weight is provided:
Wherein, R2O is Na2O and K2The mixture of O, the mixture of XO MgO, CaO and SrO,
And in the weight percentage of each component,
R2The weight ratio of O and XO is (2~5): 1；
Na2O and K2The weight ratio of O is (1~6): 1；
1% < (CaO+SrO-MgO) < 3%；
The raw material components are mixed, are melted, are clarified, are annealed, forms the borosilicate glass is prepared；It is preparing
β-OH content is 0.01~0.3/mm in the process.
9. the preparation method of borosilicate glass according to claim 8, which is characterized in that control institute during the preparation process
Stating β-OH content in borosilicate glass is 0.1~0.2/mm.
10. borosilicate glass as described in any one of claims 1 to 7 is as medical container or electric light source glass tube or the sun
The application of energy evacuated collector tube or other glass containers.
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