Method for manufacturing sealing material
A manufacturing method and sealing material technology, applied in the field of sealing materials, can solve the problems of high glass softening temperature, high interface air leakage rate, easy crystallization, etc.
Inactive Publication Date: 2017-05-24
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology
However, there are still improvements in these sealing materials, Al 2 o 3 -The interface air leakage rate of Al-based composite sealing material is high; 2 o 3 -Glass matrix composites have the problems of high glass softening temperature and easy crystallization. During the long-term operation of SOFC, the structure of the sealing material is unstable, which affects the performance of the stack
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[0040] al 2 o 3 - Glass-based sealing materials according to Al 2 o 3 The mass ratio to DT4 powder is 50:50, 60:40, 70:30, 80:20, 90:10. The ethanol and xylene are mixed in a certain proportion to prepare a mixed solution for preparing Al2O3-glass powder casting slurry. In order to ensure that the slurry has a stable viscosity for casting, according to the mass ratio of Al2O3-glass powder and the particle size of the powder, the mass ratio of ethanol and xylene is in the range of 30-90:10-70, respectively. The extended belts are named AD50, AD40, AD30, AD20, AD10. Among the h-BN (hexagonal boron nitride)-based sealing materials, the casting tape with only h-BN powder added is named h-BN sealing material. According to the mass ratio of h-BN and G glass powder added 50:50, 70:30, 90:10, the casting belts were named h-BN-G50, h-BN-G30, h-BN-G10 respectively.
[0041] al 2 o 3 The average particle size of the micropowder is 1.2μm, and the thermal expansion coefficient is ...
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Abstract
The invention discloses a method for manufacturing a sealing material. The method comprises the following steps that after a solvent, a dispersing agent and powder are mixed and ball-milled for 12 h, an adhesive, a plasticizer and a defoaming agent are added, the materials are mixed, ball milling is carried out for 3 h during use, then a certain amount of solvent is added, and ball milling continues to be carried out for 24 h; then vacuum degassing is carried out, a precision casting machine is used for casting, a white blank is formed, standing and airing are carried out, and the sealing material is obtained. By means of the ingredient design and structural adjustment and control of the sealing material, DT4 glass with relatively low softening temperature is added into a Al2O3-based sealing material, a Al2O3 framework is filled with the melted glass, and the ceramic-based composite sealing material is obtained. On the basis of keeping the structural strength of the sealing material, the sealing performance of the sealing material is effectively improved, a structure compounding technology of the SOFC sealing material is provided, and manufacturing and popularization of the high-performance SOFC sealing material can be achieved.
Description
technical field [0001] The invention relates to a method for making a sealing material. Background technique [0002] In terms of sealing materials, Al with good flexibility has been prepared by casting technology. 2 o 3 -Al-based sealing material, which has been successfully applied to stack assembly, and its air leakage rate is about 0.02sccm·cm when the applied load is 30Psi (200kPa) -1 , the performance remains stable after nearly 100 thermal cycles. In addition, the laboratory has also developed a variety of Al 2 o 3 - Glass-based composite sealing material also achieves better sealing effect. However, there are still improvements in these sealing materials, Al 2 o 3 -The interface air leakage rate of Al-based composite sealing material is high; 2 o 3 -The glass-based composite material has the problems of high glass softening temperature and easy crystallization. During the long-term operation of SOFC, the structure of the sealing material is unstable, which a...
Claims
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Login to View More IPC IPC(8): C04B35/10C04B35/622C04B35/626C04B35/632C04B35/634
CPCC04B35/10C04B35/622C04B35/6261C04B35/6264C04B35/632C04B35/6342C04B2235/36C04B2235/386
Inventor 李箭姚巍蒲健池波贾礼超颜冬
Owner HUAZHONG UNIV OF SCI & TECH