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A kind of glass-vermiculite composite sealing material and its preparation method and application

A sealing material and vermiculite technology, which is applied in mechanical equipment, engine sealing, sealing/supporting devices, etc., can solve the problems of poor air tightness and limit the application range of glass materials, etc., achieve good sealing effect and improve power generation Efficiency, service life, and the effect of expanding the application range

Active Publication Date: 2020-08-28
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the defect of poor airtightness of solid fuel cell sealing materials in the prior art at high temperatures, the thermal expansion coefficient of glass, the main component of the sealing material, needs to be close to that of the material to be sealed, which limits the application range of glass materials.

Method used

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  • A kind of glass-vermiculite composite sealing material and its preparation method and application
  • A kind of glass-vermiculite composite sealing material and its preparation method and application
  • A kind of glass-vermiculite composite sealing material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Grinding: The glass composition and content used are SiO 2 70.4 wt%, K 2 O 10.5wt%, Na 2 O6.5wt%, CaO 4.3wt%, BaO 2.2wt%, MgO 1.3wt%, TiO 2 1.2wt%, the rest is Fe 2 o 3 , the softening temperature of the glass is lower than 650°C, and its thermal expansion is as follows figure 2 As shown, the coefficient of thermal expansion of glass at a temperature of 30-600°C is (8.4-11.2)×10 -6 K -1 ; The glass powder is calcined at high temperature to form a molten body, then crushed and ground after quenching and quenching, adding ethanol and zirconia balls for ball milling for more than 12 hours, drying after ball milling and passing through a 200-mesh sieve to obtain glass powder, and preliminarily crushing the vermiculite Then add ethanol and zirconia balls to grind for more than 18 hours, then dry and pass through a 200-mesh sieve to obtain vermiculite powder;

[0048] (2) Molding: cast the glass powder and vermiculite powder in the process (1) separately, specif...

Embodiment 2

[0055] Other steps are the same as in Example 1, the difference is that the vermiculite powder used in the step (2) is preheated, and the specific pretreatment is that the vermiculite powder is heated to 900° C. for 60 minutes with a 2° C. / min muffle furnace, and then heated at 2° C. / min cooling rate down to room temperature.

[0056] The resulting composite sealing material ring was cut according to the same method as in Example 1, placed, and tested under the same battery test conditions, Figure 7 It is the stability of the open circuit voltage during the battery test in Example 2. The open circuit voltage (OCV) of the single battery tested at 750°C has no obvious attenuation in the 6 thermal cycle tests of the temperature rising to 750°C and cooling to 100°C. The test time exceeds 2500min, and the OCV remains above 1.05V.

Embodiment 3

[0058] Other steps are the same as in Example 2, except that a five-layer composite sealing material of glass-vermiculite-glass-vermiculite-glass is finally obtained, with a thickness of about 3.1mm.

[0059] The obtained composite sealing material ring was cut according to the same method as in Example 1, placed, and tested under the same battery test conditions. The open circuit voltage (OCV) of the single cell tested at 750°C experienced a temperature rise of 750°C and a temperature drop of 100°C. The OCV of the battery has no obvious decay in the 8 thermal cycle tests, and the cumulative test time exceeds 3000min, and the OCV remains above 1.05V.

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Abstract

The invention provides a glass-vermiculite composite sealing material as well as a preparation method and application thereof, the glass-vermiculite composite sealing material is a multilayer composite sealing material formed by sequentially stacking glass film blanks and vermiculite film blanks, and the condition is that the glass blanks are arranged on two sides of the composite material. According to the invention, two materials of glass and vermiculite are crossed and stacked to obtain a sandwich sealing structure, the glass softens and wets ceramic and metal and wets the rough surface ofthe vermiculite layer at a test temperature, and the glass, the ceramic, the metal and the vermiculite layer are combined more tightly to prevent the glass from being softened excessively to cause increase of air leakage rate. The vermiculite layer is low in porosity after being heated, so that the air tightness of sealing is improved. The composite sealing material and the sandwich sealing structure provided by the invention are wide in use temperature range, low in requirement on the thermal expansion coefficient of glass and high in sealing air tightness, the performance of a battery is effectively improved, and the service life of the battery is effectively prolonged.

Description

technical field [0001] The invention relates to a composite material, especially a composite sealing material, which is formed by overlapping glass and vermiculite, and can be used as the sealing of solid oxide fuel cells or other heterogeneous sealing. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is an all-solid-state power generation device that can directly convert chemical energy into electrical energy efficiently, and the process is not affected by the Carnot cycle, with high power generation efficiency, and the reaction process is environmentally friendly and pollution-free. High reliability . [0003] The SOFC stack is mainly composed of electrodes, electrolytes, connectors and sealing materials. Among them, the excellent performance of the sealing material directly affects the performance of the battery stack. During the operation of the battery, gases such as oxygen and hydrogen need to be fed to the cathode and anode respectively. In order to preven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0282C04B37/02F16J15/10F16J15/06
CPCC04B37/02F16J15/06F16J15/102F16J15/104F16J15/108H01M8/0282Y02E60/50
Inventor 杨志宾郭梦媛葛奔雷泽彭苏萍
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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