Publication Date:
2017-06-02
Description:
UCO ceramic microspheres were fabricated by combination of internal gelation and carbothermic reduction process. The effects of the sintering atmosphere and C/U ratio on the UCO ceramic microspheres were studied,The composition, surface morphology and microstructure of the sintered UCO ceramic microspheres were analyzed. The results indicated that increasing CO concentration in the sintering atmosphere could slow down the rate of the carbothermic reduction, and when the concentration of CO increased to 20% or above, CO could inhibit the reaction, and the microstructure of the sintered microspheres changed obviously and became loose. With the increase of C/U ratio in the broth, some residual carbon would exist in the sintered microspheres due to large size of the carbon particles. The increase in C/U did not cause the reduction of the crush strength and geometrical density of the microspheres. When the C/U was above 2.5, dense and strong UCO ceramic microspheres were produced in argon containing 5% CO at 1680°C. This article is protected by copyright. All rights reserved.
Print ISSN:
1546-542X
Electronic ISSN:
1744-7402
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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