CN102424518B - Preparation method of outer pipe of evacuated collector tube for parabolic trough solar photothermal power generation - Google Patents
Preparation method of outer pipe of evacuated collector tube for parabolic trough solar photothermal power generation Download PDFInfo
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- CN102424518B CN102424518B CN 201110264379 CN201110264379A CN102424518B CN 102424518 B CN102424518 B CN 102424518B CN 201110264379 CN201110264379 CN 201110264379 CN 201110264379 A CN201110264379 A CN 201110264379A CN 102424518 B CN102424518 B CN 102424518B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000010248 power generation Methods 0.000 title abstract description 8
- 239000011521 glass Substances 0.000 claims abstract description 183
- 239000005388 borosilicate glass Substances 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 41
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 229910000833 kovar Inorganic materials 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 238000000137 annealing Methods 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 230000004927 fusion Effects 0.000 claims description 7
- 230000035939 shock Effects 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 239000000306 component Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention discloses a preparation method of an outer pipe of an evacuated collector tube for parabolic trough solar photothermal power generation, comprising the following steps of: selecting raw materials, respectively preparing No.1 transitional glass, No.2 transitional glass and No.3 transitional glass; successively sealing Kovar alloy, DM308 glass, the No. 3 transitional glass, the No.2 transitional glass, the No.1 transitional glass and 3.3 borosilicate glass on a glass lathe by using flame, followed by annealing, heating two sticks of 3.3 borosilicate glass for sealing end sockets to the temperature of 850-950 DEG C, and melting between the 3.3 borosilicate glass for sealing. By the adoption of the preparation method of the outer pipe of the evacuated collector tube for parabolic trough solar photothermal power generation, metal and glass seal members can meet the application requirement of the outer pipe of the evacuated collector tube for parabolic trough solar photothermal power generation, and problems of crack, gas leakage, low thermal shock resistance and low seal strength in present collector tubes are solved.
Description
Technical field
The invention belongs to solar light-heat power-generation thermal-collecting tube technical field, relate to the preparation method of solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube.
Background technology
Solar energy optical-thermal slot type generating is a kind of of solar electrical energy generation, and vacuum heat collection pipe is core component, only has at present metal and glass head seal Glass tubing can satisfy the technical requirements of solar light-heat power-generation vacuum heat collection pipe outer tube, and to only have the coefficient of expansion be 3.3 * 10
-6/ ℃ borosilicate glass (be called for short 3.3 borosilicate glass) can satisfy the technical requirements of solar vacuum heat-collecting pipe outer tube.Solar vacuum heat-collecting pipe is that the coefficient of expansion is 3.3 * 10 with the main part of Glass tubing at present
-6/ ℃ borosilicate glass.
External had the technology that adopts stainless steel and the 3.3 direct sealing-ins of borosilicate glass to occur.Yet, the applicant is through lot of experiments, find that this sealing technology exists the great problem of this type of stainless steel product difficulty of processing, and difficulty is larger when stainless steel and 3.3 borosilicate glass are carried out sealing-in, has so just caused that yield rate is low, cost is high, the mass production hard problem.
The technology that kovar alloy (KOVAR) and the 3.3 direct sealings by fusing of borosilicate glass are produced the solar vacuum heat-collecting pipe outer tubes is also infeasible, because the coefficient of expansion has big difference during unmatched sealing, cause closure to burst, can not use.
The applicant finds by research, kovar alloy and DM308 glass head seal have good sealing property, but the DM308 Glass tubing is because of the former of printing opacity rate variance, poor chemical stability thereby can not satisfy the technical requirements of solar vacuum heat-collecting pipe outer tube, can not be as the main part of thermal-collecting tube.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube, make metal and glass sealing part can satisfy the service requirements of solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube, solved that existing thermal-collecting tube bursts, gas leakage, heat shock resistance and the low problem of sealing strength.
The technical solution adopted in the present invention is, the preparation method of solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube carries out according to following steps:
Prepare No. 1 transitional glass:
According to mass percent, take respectively 63.2%～73% SiO
2, 16.9%～21.4% B
2O
3, 2%～5% CaO, 0.35%～0.7% K
2O, 4.2%～7.45% Na
2O, 2.5%～3.3% ZnO, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 1;
Prepare No. 2 transitional glass:
According to mass percent, take respectively the SiO of 74.7%-78.6%
2, the B of 13.4%-20.4%
2O
3, the K of 1.8%-3.3%
2O, the Na of 3.1%-4.7%
2O, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 2;
Prepare No. 3 transitional glass:
According to mass percent, take respectively the SiO of 75%-79%
2, the B of 11.5%-16.4%
2O
3, the CaO of 0.22%-0.4%, the K of 2.3%-4.6%
2O, the Na of 0.6%-1.1%
2O, the Al of 3.78%-5.1%
2O
3, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 3;
Adopting existing technique to prepare respectively kovar alloy, DM308 glass, the coefficient of expansion is 3.3 * 10
-6/ ℃ borosilicate glass;
Kovar alloy, DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass, the coefficient of expansion that step 1 is made are 3.3 * 10
-6/ ℃ borosilicate glass carry out sealing-in with flame successively on glass work lathe, 850 ℃～950 ℃ of sealing temperatures make the sealing-in termination; Then annealing furnace is put into, 500 ℃ of-550 ℃ of annealing of furnace temperature in the sealing-in termination;
Get two of sealing-in terminations after step 2 annealing, then sealing-in is carried out with flame in two sealing-in terminations on glass work lathe; The detailed process of sealing-in is, is 3.3 * 10 with the coefficient of expansion in two sealing-in terminations
-6/ ℃ borosilicate glass be heated to 850 ℃～950 ℃, and be 3.3 * 10 with the coefficient of expansion in these two sealing-in terminations
-6/ ℃ borosilicate glass between carry out fusion seal, namely make.
The present invention becomes kovar alloy, DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass the sealing-in termination successively with 3.3 borosilicate glass sealings by fusing, and then two sealing-in termination sealing-ins are become vacuum glass heat collection tube.No. 1 transitional glass, No. 2 transitional glasses, No. 3 transitional glasses adopt unleaded glass formula, pass through glass smelting, be shaped to glass bulb, glass-tube, become the sealing by fusing vacuum glass heat collection tube of kovar alloy-DM308 glass-No. 3 transitional glass-No. 2 transitional glass-No. 1 transitional glass-3.3 borosilicate glass six segmentations through flame sealing, solved existing metal and directly caused stress large with 3.3 borosilicate glass sealing-ins, caused that thermal-collecting tube bursts, gas leakage, heat shock resistance and the low problem of sealing strength; Satisfy the service requirements of solar light-heat power-generation vacuum heat collection pipe, realized batch production.Adopt simultaneously unleaded formula, the problem of turning black when avoiding the vacuum heat-collecting tube glass sealing-in has improved the vacuum heat collection pipe transmitance, and avoids causing environmental pollution.Complete processing adopts ripe electron tube glass processing technology, has reduced technical difficulty, has realized mass production.The metal-glass sealing spare of making can satisfy the service requirements of photo-thermal power generation vacuum heat collection pipe.
Description of drawings
Fig. 1 is the structural representation of sealing-in termination in the present invention.
Fig. 2 is the structural representation of solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube in the present invention.
In figure, 1, kovar alloy, 2, DM308 glass, 3, No. 3 transitional glasses, 4, No. 2 transitional glasses, 5, No. 1 transitional glasses, 6,3.3 borosilicate glass.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The preparation method of solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube of the present invention, carry out according to following steps:
Prepare No. 1 transitional glass
According to mass percent, take respectively 63.2%～73% SiO
2, 16.9%～21.4% B
2O
3, 2%～5% CaO, 0.35%～0.7% K
2O, 4.2%～7.45% Na
2O, 2.5%～3.3% ZnO, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 1;
Prepare No. 2 transitional glass
According to mass percent, take respectively the SiO of 74.7%-78.6%
2, the B of 13.4%-20.4%
2O
3, the K of 1.8%-3.3%
2O, the Na of 3.1%-4.7%
2O, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 2;
Prepare No. 3 transitional glass
According to mass percent, take respectively the SiO of 75%-79%
2, the B of 11.5%-16.4%
2O
3, the CaO of 0.22%-0.4%, the K of 2.3%-4.6%
2O, the Na of 0.6%-1.1%
2O, the Al of 3.78%-5.1%
2O
3, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 3;
Preparation kovar alloy, DM308 glass, 3.3 borosilicate glass
Adopt existing technique to prepare kovar alloy, DM308 glass, 3.3 borosilicate glass;
Kovar alloy, DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass, 3.3 borosilicate glass that step 1 is made carry out sealing-in with flame according to the structure of Fig. 1 on glass work lathe, 850 ℃～950 ℃ of sealing temperatures make the sealing-in termination; The structure of sealing-in termination 1 as shown in Figure 1, sealing-in successively between kovar alloy 1, DM308 glass 2, No. 3 transitional glasses 3, No. 2 transitional glasses 4, No. 1 transitional glass 5,3.3 borosilicate glass 6.Then annealing furnace is put into, 500 ℃ of-550 ℃ of annealing of furnace temperature in the sealing-in termination;
Get two of sealing-in terminations after step 2 annealing, then sealing-in is carried out with flame in two sealing-in terminations on glass work lathe; Detailed process is, with 850 ℃～950 ℃ of 3.3 borosilicate glass heating of two sealing-in terminations, and carries out fusion seal between 3.3 borosilicate glass with these two sealing-in terminations, namely makes solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube.The structure of the solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube that makes is about between two sealing-in terminations of Fig. 1 by 3.3 borosilicate glass fusion seals together as shown in Figure 2.
In the present invention, the transition sealing mode differs according to the coefficient of expansion between each transitional glass and on average is no more than 10% the requirement of putting into practice, at first designed the mode of this transitional glass sealing-in, again in conjunction with the requirement to the glass physicochemical property of the environment for use of solar energy glass pipe, take into account simultaneously manufacturing process, designed successively the formula of No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass, in formula, each component consists of the coefficient of expansion and physicochemical property requirement jointly again.
According to mass percent, take respectively 73% SiO
2, 17.95% B
2O
3, 2% CaO, 0.35% K
2O, 4.2% Na
2O, 2.5% ZnO, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃, glass metal 1200 ℃ of blowings, be drawn into transitional glass No. 1; According to mass percent, take respectively 74.7% SiO
2, 20.4% B
2O
3, 1.8% K
2O, 3.1% Na
2O, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃, glass metal 1200 ℃ of blowings, be drawn into transitional glass No. 2; According to mass percent, take respectively 76.7% SiO
2, 16.4% B
2O
3, 0.22% CaO, 2.3% K
2O, 0.6% Na
2O, 3.78% Al
2O
3, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃, glass metal 1200 ℃ of blowings, be drawn into transitional glass No. 3; Then prepare kovar alloy, DM308 glass, 3.3 borosilicate glass; Kovar alloy, DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass, 3.3 borosilicate glass of making are carried out sealing-in with flame successively on glass work lathe, 850 ℃ of sealing temperatures make the sealing-in termination; Then annealing furnace is put into, 500 ℃ of annealing of furnace temperature in the sealing-in termination; Sealing-in is carried out with flame in two sealing-in terminations on glass work lathe; Detailed process is, with 850 ℃ of 3.3 borosilicate glass heating of two sealing-in terminations, and carries out fusion seal between 3.3 borosilicate glass with these two sealing-in terminations, namely makes.
According to mass percent, take respectively 63.2% SiO
2, 21.4% B
2O
3, 3.95% CaO, 0.7% K
2O, 7.45% Na
2O, 3.3% ZnO, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1500 ℃, glass metal 1250 ℃ of blowings, be drawn into transitional glass No. 1; According to mass percent, take respectively 78.6% SiO
2, 13.4% B
2O
3, 3.3% K
2O, 4.7% Na
2O, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1500 ℃, glass metal 1250 ℃ of blowings, be drawn into transitional glass No. 2; According to mass percent, take respectively 75% SiO
2, 13.8% B
2O
3, 0.4% CaO, 4.6% K
2O, 1.1% Na
2O, 5.1% Al
2O
3, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1500 ℃, glass metal 1250 ℃ of blowings, be drawn into transitional glass No. 3; Preparation kovar alloy, DM308 glass, 3.3 borosilicate glass; Kovar alloy, DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass, 3.3 borosilicate glass of making are carried out sealing-in with flame successively on glass work lathe, 950 ℃ of sealing temperatures make the sealing-in termination; Then annealing furnace is put into, 550 ℃ of annealing of furnace temperature in the sealing-in termination; Sealing-in is carried out with flame in two sealing-in terminations on glass work lathe; Detailed process is, with 950 ℃ of 3.3 borosilicate glass heating of two sealing-in terminations, and carries out fusion seal between 3.3 borosilicate glass with these two sealing-in terminations, namely makes.
According to mass percent, take respectively 68.6% SiO
2, 16.9% B
2O
3, 5% CaO, 0.5% K
2O, 6% Na
2O, 3% ZnO, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1420 ℃, glass metal 1220 ℃ of blowings, be drawn into transitional glass No. 1; According to mass percent, take respectively 76% SiO
2, 17.5% B
2O
3, 2.5% K
2O, 4% Na
2O, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1430 ℃, glass metal 1210 ℃ of blowings, be drawn into transitional glass No. 2; According to mass percent, take respectively 79% SiO
2, 11.5% B
2O
3, 0.3% CaO, 3.8% K
2O, 0.9% Na
2O, 4.5% Al
2O
3, each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1430 ℃, glass metal 1210 ℃ of blowings, be drawn into transitional glass No. 3; Preparation kovar alloy, DM308 glass, 3.3 borosilicate glass; Kovar alloy, DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass, 3.3 borosilicate glass of making are carried out sealing-in with flame successively on glass work lathe, 900 ℃ of sealing temperatures make the sealing-in termination; Then annealing furnace is put into, 520 ℃ of annealing of furnace temperature in the sealing-in termination; Sealing-in is carried out with flame in two sealing-in terminations on glass work lathe; Detailed process is, with 900 ℃ of 3.3 borosilicate glass heating of two sealing-in terminations, and carries out fusion seal between 3.3 borosilicate glass with these two sealing-in terminations, namely makes.
Heatproof impact test:
Each 5 is followed to choose respectively solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube that embodiment 1-embodiment 3 makes, through baking oven annealing, can cut down ring cutting edge, each sealing-in place with lens examination does not burst, carry out following test: sample after 5 minutes, drops into rapidly in water by test temperature gradation insulation at glass envelope group baking oven, keeps 1 minute, whether taking-up bursts with lens examination, when occurring bursting, be recorded in form, until all samples all bursts.Solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube heatproof impact test recorder is as follows:
Annotate:
1. in the test, temperature is the baking oven design temperature, when being incubated 5 minutes, oven temperature can be higher 10 ℃ than design temperature～and 20 ℃;
2. the water in the test is the non-mobile water of putting into bucket.
3. baking oven actual temperature in test site differs less than 5 ℃ through check and baking oven instrument temperature;
The results show thermal shock resistance is good, and average heat shock resistance temperature is 202 ℃.
The transitional glass that focuses on No. 1 of the present invention, No. 2 transitional glasses, the preparation of No. 3 transitional glasses, then make have kovar alloy, the solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube of DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass and 3.3 borosilicate glass structures.Solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube of the present invention has the following advantages:
1. resistance to air loss is good, the homogeneous tube leak rate: helium reveals＜1 * 10
-9Pa.m
3/ sec.
2. solved existing metal and directly caused stress large with 3.3 borosilicate glass sealing-ins, caused that thermal-collecting tube bursts, gas leakage, heat shock resistance and the low problem of sealing strength.Sealing-in place heat shock resistance temperature is high, and through overtesting, the heat shock resistance temperature is 202 ℃.Heatproof test: closure 450 ℃ of design temperatures in glass envelope group baking oven, be incubated 2 hours, indeformable, performance is unchanged, proves that heat resisting temperature is high; Tensile strength 30KG, intensity is high.
3.1 number transitional glass, No. 2 transitional glasses, No. 3 transitional glass adopts unleaded formula, and the problem of having turned black when having solved the vacuum heat-collecting tube glass sealing-in has improved the vacuum heat collection pipe transmitance, and avoids causing environmental pollution.
4. the electron tube glass processing technology of whole process using maturations, reduced technical difficulty, realized mass production.
Claims (1)
1. the preparation method of a solar energy optical-thermal slot type electricity-generating vacuum thermal-collecting tube outer tube, carry out according to following steps:
Step 1
Prepare No. 1 transitional glass:
According to mass percent, take respectively 63.2%～73% SiO
2, 16.9%～21.4% B
2O
3, 2%～5% CaO, 0.35%～0.7% K
2O, 4.2%～7.45% Na
2O, 2.5%～3.3% ZnO, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 1;
Prepare No. 2 transitional glass:
According to mass percent, take respectively the SiO of 74.7%-78.6%
2, the B of 13.4%-20.4%
2O
3, the K of 1.8%-3.3%
2O, the Na of 3.1%-4.7%
2O, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 2;
Prepare No. 3 transitional glass:
According to mass percent, take respectively the SiO of 75%-79%
2, the B of 11.5%-16.4%
2O
3, the CaO of 0.22%-0.4%, the K of 2.3%-4.6%
2O, the Na of 0.6%-1.1%
2O, the Al of 3.78%-5.1%
2O
3, the mass percent summation of above component is 100%; Each raw material mechanically mixing with taking stirs, and makes admixtion, then admixtion is dropped in glass furnace, is fused into glass metal at 1370 ℃～1500 ℃, glass metal 1200 ℃～1250 ℃ blowings, be drawn into transitional glass No. 3;
Adopting existing technique to prepare respectively kovar alloy, DM308 glass, the coefficient of expansion is 3.3 * 10
-6/ ℃ borosilicate glass;
Step 2
Kovar alloy, DM308 glass, No. 3 transitional glasses, No. 2 transitional glasses, No. 1 transitional glass, the coefficient of expansion that step 1 is made are 3.3 * 10
-6/ ℃ borosilicate glass carry out sealing-in with flame successively on glass work lathe, 850 ℃～950 ℃ of sealing temperatures make the sealing-in termination; Then annealing furnace is put into, 500 ℃ of-550 ℃ of annealing of furnace temperature in the sealing-in termination;
Step 3
Get two of sealing-in terminations after step 2 annealing, then sealing-in is carried out with flame in two sealing-in terminations on glass work lathe; The detailed process of sealing-in is, is 3.3 * 10 with the coefficient of expansion in two sealing-in terminations
-6/ ℃ borosilicate glass be heated to 850 ℃～950 ℃, and be 3.3 * 10 with the coefficient of expansion in these two sealing-in terminations
-6/ ℃ borosilicate glass between carry out fusion seal, namely make.
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| CN103504955B (en) * | 2013-09-22 | 2015-05-06 | 胡飞宫 | Glass and method for connecting glass body and base |
| CN105271653B (en) * | 2015-10-29 | 2017-11-21 | 中国原子能科学研究院 | A kind of envelope segmentation method for gaseous state tritium light source glass tube |
| CN115732289B (en) * | 2021-09-02 | 2025-11-18 | 北京振兴计量测试研究所 | A vacuum ultraviolet discharge tube |
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| CN101798184A (en) * | 2010-02-26 | 2010-08-11 | 北京天瑞星真空技术开发有限公司 | Sealing connection method of metal and glass of novel medium-high temperature solar energy heat collection pipe |
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