A high-temperature-resistant sealing material for dense oxygen-permeable ceramic membrane
A technology of sealing materials and ceramic materials, which is applied in the field of high-temperature-resistant sealing materials for dense oxygen-permeable ceramic membranes. It can solve the problem of serious interaction between glass sealing materials and ceramic membranes, affecting the stability of membranes, and the working temperature should not be too high. question
Active Publication Date: 2011-12-21
SHANGHAI UNIV +1
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Problems solved by technology
One is alloy sealing, such as Ti-Au-Cu and Ni-Ag-Cu, which are suitable for permanent sealing between membrane and metal, but the design of alloy composition is very complicated. The reaction is not easy to avoid (US Patent5139191; J. Mater. Sci., 1997, 32, 653; Fuel, 2006, 85, 156-162)
The second is the sealing of gold, silver and other alloy rings, which is similar to the sealing of colloidal "O" rings at low temperatures. Under high temperature and external pressure, a certain amount of gold or silver between the dense ceramic membrane and the membrane support will be produced. Sealing is realized by deformation. This kind of sealing has better chemical stability and durability at high temperature, but the overall assembly design requirements are strict, especially the contact end surface of the membrane and the support should be very flat, and the pressure should be uniform and appropriate. Gold, The expansion coefficient of the silver sealing ring and the membrane is quite different, and silver has the property of hydrogen permeability, and has a catalytic effect on some chemical reactions, which is easy to cause errors in the experimental process. The use temperature generally cannot be higher than 900 ° C, and it is not suitable for ceramic membranes. Scale up the process using
Glass material sealing generally has a narrow operating temperature range, and the working temperature should not be too high, and the interaction between the glass sealing material and the ceramic membrane itself is serious, which affects the stability of the membrane. When changing the working temperature, due to the difference in expansion coefficient , often leads to the rupture of the membrane
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Embodiment 1
[0022] The composition and weight percentage of the high temperature resistant sealing material used in the design are as follows:
[0023] Dense oxygen-permeable ceramic material base material Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-8 60%,
[0024] Heat-resistant glass powder (Pyres glass) 30%,
[0025] Flux B 2 o 3 or Li 2 O 5%,
[0026] Moisturizer NaAlO 2 or NaSiO 3 5%.
[0027] The preparation method is as follows:
[0028] Weigh the above four raw material powders according to the above formula, put them in a high-efficiency ball mill to fully grind and mix them to obtain a uniformly mixed batch; then put the batch in a high-temperature furnace for 20 minutes at 1200°C to melt it ; Then cool down to room temperature with the furnace, take out the frit; then grind and pulverize the frit to obtain high temperature resistant sealing material powder.
[0029] The using method of the high temperature resistant sealing material that the in...
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The invention relates to a preparation method of a high-temperature-resistant sealing material for a dense oxygen-permeable ceramic membrane and its application; in particular, it relates to a high-temperature sealing material between a dense oxygen-permeable ceramic membrane and its supporting components, and its application under high-temperature conditions. It belongs to the technical field of special ceramic bonding materials. The high-temperature-resistant sealing material of the dense oxygen-permeable ceramic film in the method of the present invention has the following composition and weight percentage: ceramic material base material 55-65%, heat-resistant Pyres glass powder 25-35%, flux B2O3 or Li2O 4-6 %, wetting agent NaAlO2 or NaSiO34 ~ 6%. The above four raw materials are weighed according to the formula, and the mixed ingredients are melted in a high-temperature furnace at 1150-1250°C for 20-40 minutes to melt, then cooled to room temperature, take out the frit, and grind the frit Pulverize to obtain high temperature resistant sealing material powder. The sealing material prepared by the method of the invention has high sealing performance, no air leakage phenomenon at high temperature, and good stability to the dense oxygen-permeable ceramic membrane.
Description
technical field [0001] The invention relates to a preparation method and application of a high-temperature-resistant sealing material for a dense oxygen-permeable ceramic membrane; in particular, it relates to a high-temperature sealing material between a dense oxygen-permeable ceramic membrane and its supporting parts, and its application under high-temperature working conditions . It belongs to the technical field of special ceramic bonding materials. Background technique [0002] Dense ceramic oxygen-permeable membranes are an important type of inorganic membranes in high-temperature gas and membrane catalytic reactions, and have very attractive application prospects in pure oxygen production, fuel cells, and membrane reactors. Regardless of the laboratory basic characterization of these dense ceramic membranes or the actual scale-up application, the high-temperature sealing between the dense ceramic membrane and its supporting component is the key problem that must be s...
Claims
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IPC IPC(8): C04B37/00
Inventor 张玉文刘勇王方钟庆东丁伟中鲁雄刚
Owner SHANGHAI UNIV