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Lead-free glass powder for electronic paste of solar battery, and preparation method for lead-free glass powder

A technology of lead-free glass powder and solar cells, which is applied in the field of solar cells, can solve the problems of mismatching expansion coefficient, poor chemical stability and wettability of lead-free glass powder, high softening temperature, etc., and achieve suitable expansion coefficient and stable glass properties , the effect of low softening temperature

Active Publication Date: 2012-08-01
昆明高聚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of poor chemical stability and wettability, high softening temperature and mismatching coefficient of expansion of current lead-free glass powder, the invention provides a kind of lead-free glass powder for solar cell electronic paste and its preparation method, through the following technology Program realization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Prepare materials according to the following mass percentages, and then ball mill until the particle size is 300 mesh, and mix evenly: B 2 o 3 30%, SiO 2 2.5%, Bi 2 o 3 36.5%, Na 2 O 5%, ZnO 3%, TiO 2 10%, ZrO 2 8%, Al 2 o 3 5%;

[0026] (2) Put the mixture in step (1) in a tunnel sintering furnace and heat it up to 160°C for 30 minutes, then heat it up to 280°C for 10 minutes, then continue to heat up to 1100°C and hold it for 60 minutes to fully melt the raw materials into glass liquid;

[0027] (3) Pour the glass liquid obtained in step (2) into deionized water for water quenching, and the glass liquid cools down sharply in the water and breaks into small glass particles;

[0028] (4) Put the small glass particles obtained in step (3), stearic acid and the ethanol solution of the ball milling medium together into a ball mill for ball milling. The stearic acid accounts for 3% of the mass of the small glass particles; the ball-to-material ratio is 3...

Embodiment 2

[0031] (1) Prepare materials according to the following mass percentages, and then ball mill until the particle size is 400 mesh, and mix evenly: B 2 o 3 60%, SiO 2 5%, Bi 2 o 3 30%, Na 2 O 0.1%, ZnO 0.1%, TiO 2 1.5%, ZrO 2 0.5%, Al 2 o 3 2.8%;

[0032] (2) Place the mixture in step (1) in a tunnel sintering furnace and heat it up to 120°C for 45 minutes, then heat it up to 300°C for 15 minutes, then continue to heat up to 1250°C and keep it for 80 minutes to fully melt the raw materials into glass liquid;

[0033] (3) Pour the glass liquid obtained in step (2) into deionized water for water quenching, and the glass liquid cools down sharply in the water and breaks into small glass particles;

[0034] (4) Put the small glass particles obtained in step (3), stearic acid and the ethanol solution of the ball milling medium together into a ball mill for ball milling. The stearic acid accounts for 3% of the mass of the small glass particles; the ball-to-material rat...

Embodiment 3

[0037] (1) Prepare materials according to the following mass percentages, and then ball mill until the particle size is below 300 mesh, and mix evenly: B 2 o 3 35%, SiO 2 20%, Bi 2 o 3 32%, Na 2 O 2.5%, ZnO 2%, TiO 2 5%, ZrO 2 1.5%, Al 2 o 3 2%;

[0038] (2) Put the mixture in step (1) in a tunnel sintering furnace and heat it up to 90°C for 40 minutes, then heat it up to 250°C for 20 minutes, then continue to heat up to 1050°C and keep it for 90 minutes to fully melt the raw materials into glass liquid;

[0039] (3) Pour the glass liquid obtained in step (2) into deionized water for water quenching, and the glass liquid cools down sharply in the water and breaks into small glass particles;

[0040] (4) Put the small glass particles obtained in step (3), stearic acid and the ethanol solution of the ball milling medium together into a ball mill for ball milling. The stearic acid accounts for 3% of the mass of the small glass particles; the ball-to-material ratio...

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Abstract

The invention provides lead-free glass powder for electronic paste of a solar battery, and a preparation method for the lead-free glass powder. The lead-free glass powder comprises the following components in percentage by mass: 30 to 60 percent of B2O3, 2.5 to 20 percent of SiO2, 30 to 55 percent of Bi2O3, 0.1 to 5 percent of Na2O, 0.1 to 3 percent of ZnO, 1.5 to 10 percent of TiO2, 0.5 to 8 percent of ZrO2, and 0.5 to 5 percent of Al2O3. The method comprises the following steps of: preparing materials, performing ball-milling to obtain powder of which the granularity is less than 300 meshes, uniformly mixing, and raising temperature and preserving heat for multiple times to ensure that the raw materials are fully fused to form glass metal; pouring into deionized water and performing water quenching, and rapidly cooling the glass metal in water and cracking into small glass particles; and performing ball-milling on the small glass particles, stearic acid and an ethanol solution used as a ball-milling medium, and drying and screening to obtain the lead-free glass powder for the electronic paste. The lead-free glass powder is low in softening temperature, high in chemical stability, appropriate in expansion coefficient, high in acid and alkaline resistance and wear resistance, wide in sintering temperature range, low in manufacturing cost, and suitable for inorganic binding phase in the electronic paste of the solar battery, and does not contain toxic heavy metal oxide.

Description

technical field [0001] The invention relates to a lead-free glass powder for solar cell electronic paste and a preparation method thereof, belonging to the technical field of solar cells. Background technique [0002] The mass fraction of glass powder in solar cell electronic paste can generally reach 5-12%. The performance of glass powder directly affects the quality of solar cell products. For example, the softening temperature of glass powder affects the oxidation of the conductive phase in solar cell electronic paste. , The expansion coefficient of the glass powder affects its ohmic contact with the silicon wafer of the solar cell, and the resistivity and dielectric properties of the glass powder directly affect the quality and life of the solar cell product. [0003] The vast majority of traditional glass powders contain heavy lead, because leaded glass powders have a series of characteristics such as high resistance, low dielectric loss, high refractive index and dispe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00
Inventor 黄惠郭忠诚
Owner 昆明高聚科技有限公司
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