CN101456672B - Leadless bismuth oxide sealing glass for sealing plate glass and preparation method thereof - Google Patents

Leadless bismuth oxide sealing glass for sealing plate glass and preparation method thereof Download PDF

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Publication number
CN101456672B
CN101456672B CN2008102074127A CN200810207412A CN101456672B CN 101456672 B CN101456672 B CN 101456672B CN 2008102074127 A CN2008102074127 A CN 2008102074127A CN 200810207412 A CN200810207412 A CN 200810207412A CN 101456672 B CN101456672 B CN 101456672B
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Prior art keywords
glass
sealing
weight percent
bismuth oxide
leadless
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CN2008102074127A
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CN101456672A (en
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陈培
乔文杰
李胜春
贺雅飞
夏秀峰
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Donghua University
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Donghua University
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Abstract

The invention relates to lead-free bismuth oxide sealing glass for sealing flat glass and a preparation method thereof. The sealing glass comprises the following components by weight percentage: 30 to 60 percent of Bi2O3, 15 to 50 percent of B2O3, 5 to 25 percent of BaO, 0.1 to 10 percent of ZnO, 0.1 to 5 percent of Al2O3, 0.1 to 5 percent of Na2O, and 0.1 to 5 percent of Li2O. The preparation method comprises the following steps: (1) weighing raw materials; (2) mixing the raw materials; (3) melting the raw materials in an electric furnace at a temperature of between 1,100 and 1,300 DEG C; (4) pelleting the molten glass by a pelleting machine; (5) ball-milling the glass; and (6) sieving, detecting and packaging the ball-milled glass powder. The expansion coefficient of the lead-free bismuth oxide sealing glass is between 68*10<-7> and 90*10<-7>/DEG C, and the sealing temperature is between 510 and 600 DEG C; and the lead-free bismuth oxide sealing glass is suitable for sealing of multiple kinds of flat glass, has the advantages of low melting point, environmental protection, innocuousness and no pollution, can be added with pigments to generate diversified colors, and meets personalized requirement.

Description

Be used for leadless bismuth oxide seal glass of sheet glass sealing-in and preparation method thereof
Technical field
The invention belongs to barium crown sealed glass and preparation field thereof, particularly relate to leadless bismuth oxide seal glass that is used for the sheet glass sealing-in and preparation method thereof.
Background technology
Sheet glass also claims white glass or clear glass, and its chemical ingredients generally belongs to soda lime glass, and compositing range is: SiO 2Be 70～73% (weight, down together); Al 2O 3Be 0～3%; CaO is 6～1 2%; MgO is 0～4%; Na 2O+K 2O is 12～16%.It has printing opacity, transparent, insulation, sound insulation, performances such as wear-resisting, weather variation.Sheet glass Main physical performance index: specific refractory power about 1.52; Transparence is more than 85% (thick 2 millimeters glass, coloured and band coating person except); 650～700 ℃ of softening temperatures; 0.81～0.93 watt of thermal conductivity/(rice is opened); The coefficient of expansion 7～9 * 10 -6/ ℃; Proportion about 2.5; Bending strength 16～60 MPas.Because its excellent physical chemistry, in electronic industry, obtained very big application, as the baseplate material and the structured material of a lot of electronic components, with mutually combining of seal glass, greatly expand its Application Areas, satisfied the demand of current electron trade development.
Seal glass is a kind of eutectic welding material.This material has suitable temperature of fusion and sealing temperature, good thermotolerance and chemical stability, high physical strength, be widely used in various fields such as electrovacuum and microelectronics, laser and infrared technique, high energy physics, the energy, aerospace, automobile, realized the mutual sealing-in between glass, pottery, metal, semi-conductor.The product of using has cathode-ray tube display, vacuum fluorescent display, plasma display, vacuum glass, solar energy heat collection pipe, laser apparatus, magneticsubstance magnetic head and magneticsubstance film etc.
Because great majority are high pbo glass in the commercial low-melting point sealing glass that uses at present, lead is very harmful to human body and environment.American-European, day has all formulated the unleaded mandatory implementation date of electronic product.China Ministry of Information Industry has also issued relevant regulations.Therefore, the successful exploitation of nuisanceless low-melting sealing glass such as lead-free and cadmium-free will form the product technology barrier, the industry face that it relates to is very extensive, consumption is big, and industries such as China's household electrical appliances, precision parts, 3C (computer, communication, consumer electronics product) electronic product are had crucial strategic importance.
In recent years, more and more higher along with microelectronics, electronics show, the development of photoelectron technology to the requirement of the performance of sealing-in goods and technology, also make the seal glass industry obtain certain development.Owing to reasons such as technical know-hows, a lot of documents about seal glass all are confined to the research to the structure and the performance of seal glass system, and other aspects reports are less.In addition, the research of China aspect seal glass also has certain distance with Japan, Korea S, America and Europe.In today of paying much attention to environmental protection, emphasis product price ratio, unleaded bismuthate seal glass has become one of main choice direction of current seal, sealing materials because of having great advantage at tool aspect unleaded and the low temperatureization.The patent of the unleaded bismuthate seal glass of domestic application in recent years is less, but external research is but quite active.
The spy of Hitachi opens flat 2-267137 and discloses a class vanadium oxide (V 2O 5) be glass, the coefficient of expansion of this glass is 90 * 10 -7/ ℃ below, sealing temperature is below 400 ℃, it mainly acts on is to prepare the coefficient of expansion in (30～45) * 10 -7/ ℃ about sealing glass powder.But in this product, plumbous oxide is the neccessary composition as component, thereby can't satisfy unleaded requirement.
The fair 5-85490 in Hitachi has proposed a class V 2O 5-Tl 2O-TeO 2-R 2O glass, it mainly becomes V 2O 5, P 2O 5, contain the oxide compound of sodium, potassium, rubidium, caesium, tellurium etc. simultaneously, can finish 400～500 ℃ sealing-in, the coefficient of expansion is (70～130) * 10 -7/ ℃.Not leaded in the composition of this glass, but owing to contain a certain amount of highly toxic substance oxidation top (Tl 2O) and noble metal tellurium (Te) etc., thereby cost is very high, and it mainly is used as the seal, sealing materials and the magnetic gap compaction material of high-performance magnetic head.
U.S. Pat P:20020019303 has proposed a kind of P 2O 5The sealing glass powder of-SnO-ZnO system, the sealing temperature of this glass are 430～500 ℃, because this sealing glass powder need be produced and sealing-in under reducing atmosphere, be unfavorable for commercial application, thereby the application of this seal glass have significant limitation.
The molecular fraction that H7-69672 number disclosed glass of Japanese Patent is formed is: P 2O 5: 25～50%, SnO:30～70%, ZnO:0～25%, add B on this basis 2O 3, WO 3, Li 2O etc., the transition temperature of this glass is 350～450 ℃, thermal expansivity is greater than 120 * 10 -7/ ℃, adopt the method for weighting agent to reduce the coefficient of expansion of glass in the patent, but flowability and resistance to air loss when having influence on glass sealing.
Summary of the invention
Technical problem to be solved by this invention provides leadless bismuth oxide seal glass that is used for the sheet glass sealing-in and preparation method thereof, this seal glass fusing point is low, nontoxic, pollution-free, can be widely used in the sealing-in of various sheet glass, satisfy market the demand of unleaded sheet glass sealing-in with lead-free glass powder.
The leadless bismuth oxide seal glass that is used for the sheet glass sealing-in of the present invention, its composition comprises: Bi 2O 3, B 2O 3, BaO, ZnO, Al 2O 3, Na 2O, Li 2O, its weight percent are 30～60%: 15～50%: 5～25%: 0.1～10%: 0.1～5%: 0.1%～5%: 0.1%～5%.
Described Bi 2O 3Be preferably 35%～50%, the best is 40%.
Described B 2O 3Be preferably 25%～35%, the best is 35%.
Described BaO is preferably 10%～15%, and the best is 14%.
Described ZnO is preferably 2%～7%, and the best is 4%.
Described Al 2O 3Be preferably 1%～4%, the best is 3%.
Described Na 2O is preferably 1%～4%, and the best is 2%.
Described Li 2O is preferably 0.5%～3%, and the best is 1%.
Can add an amount of colour component in the described glass powder.
The preparation method who is used for the leadless bismuth oxide seal glass of sheet glass sealing-in of the present invention comprises:
(1) weight percent according to following each component takes by weighing each raw material;
Bi 2O 3 30～60％
B 2O 3 15～50％
BaO 5～25％
ZnO 0.1～10％
Al 2O 3 0.1～5％
Na 2O 0.1％～5％
Li 2O 0.1％～5％
(2) with the raw material thorough mixing that is taken by weighing;
(3) mixed compound is put into crucible, put into furnace temperature then and be 1100 ℃～1300 ℃ electric furnace, insulation 2～4h;
(4) glass metal after will melting is poured tabletting machine into and is pressed into thin slice or pours in the cold water or be cast into certain shape;
(5) sheet or granular glass and pigment are put into the ball mill ball milling together;
(6) glass powder behind the ball milling is sieved, detects, packs.
Described step (4) barium crown sealed glass is shaped as strip, column, dull and stereotyped dress, powdery and is pressed into needed shape.
Described step (6) barium crown sealed glass can add pigment, produces the color variation.
The coefficient of expansion 68～90 * 10 of leadless bismuth oxide seal glass of the present invention -7/ ℃, 510～600 ℃ of sealing temperatures are applicable to the sealing-in of various sheet glass.
The present invention can provide the barium crown sealed glass that matches according to the characteristic of concrete seal, sealing materials and to the specific requirement of the temperature and the coefficient of expansion, obtains multiple barium crown sealed glass with different coefficients of expansion thereby its method is to select for use different components to constitute glass.
Beneficial effect
(1) the present invention is not leaded, satisfies the environmental requirement of WEEE, RoHS instruction, can realize the sealing-in to sheet glass under the lower glass transition temperature of maintenance;
(2) this seal glass fusing point is low, nontoxic, pollution-free;
(3) applied widely, have the performance setting range of broad, simultaneously can also with the glass that conforms to the coefficient of expansion in this temperature, pottery, metal sealing, sealing property is good;
(4) can add pigment, produce the color variation, satisfy different clients' individual demand;
(5) test result shows, not only has thermal expansivity suitable and that be easy to adjust, suitable softening temperature, also has excellent chemical stability, special have the cost performance height having very strong competitive power aspect unleaded and the excellent performance, has market development prospect widely.
Description of drawings
The DTA curve of Fig. 1 embodiment 3
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition after having read content of the present invention, those skilled in the art can make various changes or modifications the present invention, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1-5
It is different and have a barium crown sealed glass of the different coefficients of expansion below to enumerate 5 kinds of components, and their component and performance perameter is set forth in the following table 1.
Table 1
Figure G2008102074127D00041
In the above table 1, each barium crown sealed glass all is to prepare according to the methods below:
(1) weight percent according to each component takes by weighing each raw material;
(2) with the raw material thorough mixing that is taken by weighing;
(3) mixed compound is put into crucible, put into furnace temperature then and be 1200 ℃ electric furnace, insulation 2h;
(4) glass metal after will melting is poured tabletting machine into and is pressed into thin slice or pours in the cold water or be cast into certain shape;
(5) sheet or granular glass and pigment are put into the ball mill ball milling together;
(6) glass powder behind the ball milling is sieved, detects, packs.
Bi here 2O 3＜30% o'clock, the degree of crystallization of glass was bigger, and glass is easy to generate crystal, and sealing temperature increases; Work as Bi 2O 3＞60% o'clock, the sealing temperature of glass reduced, and mobile the increase realized low intermediate temperature sealing easily, and still, cost has bigger rising, and simultaneously, the coefficient of expansion increases, and is unsuitable for and the sheet glass sealing-in.Best scope is 35%～50%.
Work as B 2O 3＜15% o'clock, B 2O 3Not obvious to the effect that reduces glass softening point, simultaneously, quicken the clarification of glass and the crystallizing power of reduction glass and descend; Work as B 2O 3＞50% o'clock, in the process of fusion cast glass, B 2O 3With the volatilization of water vapour, on the glass metal surface because of B 2O 3Volatilization reduces, and can produce crystallization material skin, works as B 2O 3Introducing is measured when too high, because boron oxygen triangle body increases, the coefficient of expansion of glass etc. increase on the contrary, and its best scope is 25%～35%.
When BaO＜5%, it is not obvious that it can increase the effect of specific refractory power, gloss and chemical stability of glass; When BaO＞25%, can make the clarification difficulty of glass, simultaneously, increased the coefficient of expansion of glass; The existence of an amount of BaO can be quickened the fusing of glass, increases the resistivity and the specific inductivity of glass, and its best scope is 10%～15%.
When ZnO＜0.1, its reduce glass the coefficient of expansion, improve glass the effect of chemical stability, thermostability and specific refractory power not obvious; When ZnO＞10, can make glass when sealing-in, be easy to crystallization, its best scope is 2%～7%.
Work as Al 2O 3＜0.1 o'clock, it reduced glass crystallization tendency, improved the DeGrain of chemical stability, thermostability, physical strength, hardness and the specific refractory power of glass; Work as Al 2O 3＞5 o'clock, increased the softening temperature of glass, its best scope is 1%～4%.
Work as Na 2O＜0.1 o'clock is to the fluxing action of glass with to reduce the effect of softening temperature of glass not remarkable; Work as Na 2O＞5 o'clock, the coefficient of expansion increases, and has reduced the chemical stability and the electrical property of glass simultaneously, and its best scope is 1%～4%.
Work as Li 2O＜0.1 o'clock is to the fluxing action of glass with to reduce the effect of softening temperature of glass not remarkable; Work as Li 2O＞5 o'clock increase the glass crystallization tendency and the coefficient of expansion; With Na 2O is used in combination, and the coefficient of expansion of glass is reduced, and the crystallization tendency diminishes, and reduces the glass melting temperature of glass, and its best scope is 0.5%～3%.

Claims (5)

1. be used for the leadless bismuth oxide seal glass of sheet glass sealing-in, its composition comprises: Bi 2O 3, B 2O 3, BaO, ZnO, Al 2O 3, Na 2O, Li 2O, its weight percent is respectively 35%～50%: 25%～35%: 10%～15%: 2%～7%: 1%～4%: 1%～4%: 0.5%～3%.
2. the leadless bismuth oxide seal glass that is used for the sheet glass sealing-in according to claim 1 is characterized in that: described Bi 2O 3Weight percent is 40%, B 2O 3Weight percent is 35%, the BaO weight percent is 14%, the ZnO weight percent is 4%, Al 2O 3Weight percent is 3%, Na 2The O weight percent is 2%, Li 2The O weight percent is 1%.
3. be used for the preparation method of the leadless bismuth oxide seal glass of sheet glass sealing-in, comprise:
(1) weight percent according to following each component takes by weighing each raw material;
Bi 2O 3 30～60％
B 2O 3 15～50％
BaO 5～25％
ZnO 0.1～10％
Al 2O 3 0.1～5％
Na 2O 0.1％～5％
Li 2O 0.1％～5％
(2) with the raw material thorough mixing that is taken by weighing;
(3) mixed compound is put into crucible, put into furnace temperature then and be 1100 ℃～1300 ℃ electric furnace, insulation 2～4h;
(4) glass metal after will melting is poured tabletting machine into and is pressed into thin slice or pours in the cold water or be cast into certain shape;
(5) sheet or granular glass and pigment are put into the ball mill ball milling together;
(6) glass powder behind the ball milling is sieved, detects, packs.
4. the preparation method who is used for the leadless bismuth oxide seal glass of sheet glass sealing-in according to claim 3 is characterized in that: described step (4) barium crown sealed glass be shaped as strip, column, tabular, powdery.
5. the preparation method who is used for the leadless bismuth oxide seal glass of sheet glass sealing-in according to claim 3 is characterized in that: described step (6) barium crown sealed glass, can add pigment, and produce the color variation.
CN2008102074127A 2008-12-19 2008-12-19 Leadless bismuth oxide sealing glass for sealing plate glass and preparation method thereof Expired - Fee Related CN101456672B (en)

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