Cerium oxide-base solid electrolyte ceramic material and its production process

Abstract

The present invention relates to one kind of cerium oxide-base soild electrolyte ceramic material and its production process. The material includes in mol% cerium oxide 75-95, samarium oxide and / or gadolinium oxide 4.9-20 and characterized specific oxide ceramic alumina and / or zirconia 0.1-5. The production process includes wet milling traditional components, adding the specific oxide ceramic andwet milling in particle ball mill for 4-8 hr to prepare CeO2 base electrolyte powder; preparing blank sheet; and sintering at 1400-1500 deg.c and 6-10 deg.c / min temperature raising rate to produce the ceramic material. The ceramic material of the present invention has high mechanical strength, low sintering temperature and simple production process suitable for industrial production.

Description

technical field [0001] The present invention relates to a kind of ceramic material and manufacturing method thereof, specifically a kind of cerium oxide (CeO 2 )-based solid electrolyte ceramic material and its manufacturing method, the international patent classification number is proposed to be Int.C1 7 .C04B35 / 00. Background technique [0002] Solid oxide fuel cells (SOFC) can be used as power sources for electrical equipment in areas or units without or far away from power grids, such as islands, borders, communication stations, offshore drilling platforms, etc., as well as in some local areas or units, such as hospitals, Special power supply for machine room, underground, mine, etc. Because of its high power generation efficiency, wide range of fuel sources, no need for precious metals as catalysts, and the realization of cogeneration of heat and power, it has shown good application prospects and huge market potential. [0003] The core in SOFC is the solid electroly...

AI Technical Summary

Problems solved by technology

In recent years ZrO 2 The main problem exposed by the base SOFC is that in order to reduce the electrolyte resistance, the SOFC has to operate at high temperature (850-1000°C)

For example, samarium oxide (Sm) made of analytically pure powder 2 o 3 ) stabilized cerium oxide (CeO 2 ) 0.9 (Sm 2 o 3 ) 0.1 system, the sintering temperature must be above 1580°C, which brings another major disadvantage: a substantial increase in energy costs

At such a high temperature, it also hinders the CeO 2 Possibility of co-sintering of base solid electrolytes with other materials such as electrodes

However, when sintering at a lower temperature, the electrical conductivity of the material decreases and the stability deteriorates.

For example, Reiss et al. studied the sintering of Ce at 1700°C in air 0.82 Gd 0.18 o 1.82 , only 95% of the sintered density can be obtained (see I.Reiss, D.Braunshtein, D.S.Tannhauser, J.Am.Ceram.Soc., 1981; 64:479); Herle et al. Human study finds general CeO 2 The particle size of the powder is greater than 0.5 μm when the base solid electrolyte is wet-milled, and it must be sintered above 1650 ° C, and the sintered density is low (95-96%) (see J.Van Herle, T.Horita, T.Kawada et al, Solid State Ionics (Solid StateIonics), 1996; 86-88: 1255); Huang et al. used sol-gel method to make uniform spherical Ce with an average diameter of 250nm 0.9 Gd 0.1 o 1.95 , obtained 99% sintered density at 1585 ° C, and the grain size is 1-10 μ m, but its process is complex, energy consumption and cost are all relatively high (see K.Huang, M.Feng, J.B.Goodenough, Journal of American Ceramic Society ( J.Am.Ceram.Soc.), 1998; 81:357), so medium temperature electrolytes have not been widely promoted and applied