Measurement of agglomerate strength distributions in agglomerated powders
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The function of the Department of Chemical and Biological Engineering has been to prepare students for the study and application of chemistry in industry. This focus has included preparation for employment in various industries as well as the development, design, and operation of equipment and processes within industry.Through the CBE Department, Iowa State University is nationally recognized for its initiatives in bioinformatics, biomaterials, bioproducts, metabolic/tissue engineering, multiphase computational fluid dynamics, advanced polymeric materials and nanostructured materials.
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The Department of Chemical Engineering was founded in 1913 under the Department of Physics and Illuminating Engineering. From 1915 to 1931 it was jointly administered by the Divisions of Industrial Science and Engineering, and from 1931 onward it has been under the Division/College of Engineering. In 1928 it merged with Mining Engineering, and from 1973–1979 it merged with Nuclear Engineering. It became Chemical and Biological Engineering in 2005.
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1913 - present
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- Department of Chemical Engineering (1913–1928)
- Department of Chemical and Mining Engineering (1928–1957)
- Department of Chemical Engineering (1957–1973, 1979–2005)
- Department of Chemical and Biological Engineering (2005–present)
- College of Engineering(parent college)
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Abstract
A new technique for measuring the strength distributions of powder agglomerates was developed. It involves the use of a calibrated ultrasonic sound field. The strength distributions of hollow glass microspheres were determined independently by mercury porosimetry, and then used to calibrate the sound field; breaking pressures from 1 to 76 MPa could be obtained by varying the energy input to the ultrasonic transducer;Agglomerate strength distributions were measured for a variety of yttria and yttria-stabilized zirconia powders, which were prepared by solution precipitation methods. Different preparation methods were used in order to obtain powders containing agglomerates with different characteristics. Special yttria powders containing agglomerates of 0.1 [mu] m, spherical, monosize spheres were also prepared. BET surface area, tap density, pressed density, compaction curves, and mercury intrusion curves were also obtained. The powders were pressed and sintered, and the sintered density measured for each pellet;Smooth curves could be drawn when agglomerate strength was plotted against sintered density; the sintered density of the powders also could be ranked directly according to the strength of the agglomerates in each powder. This is the first time that quantitative correlation between agglomerate strength and sintered density has been shown experimentally;Except for the model yttria powders containing monosize spherical particles, there was no correlation between sintered density and any other measured powder parameter. For this model powder, most of measured powder parameters correlated directly with sintered density, in almost textbook fashion. It was also possible, using these model powders, to isolate the effect of agglomerate strength on sintered density by holding all other powder characteristics constant. This is the first time that the effect of agglomerate strength alone has been shown for a real powder. ftn * DOE Report IS-T-1325. This work was performed under contract No. W-7405-Eng-82 with the U.S. Department of Energy.