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Additional info for Ceramic Technology for Advanced Heat Engines [prog rpt Oct 89 - Mar 90]

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66110], 1498-1504 (1987). -86X-5B]82C. August-September 1989, Qf Milestones Ali milestones are on schedule. Publications Vimal K. Pujari presented a paper entitled, "Powder Characteristics and Its Effects on the Binder Removal Process," at a poster session of the Third International conference on Ceramic Processing Science, February 4-7, 1990, San Diego, California. 55 Table 1 Mercury porosimetry results with and without binders of pressure cast discs ( , SAMPLE ................. 74 1,74. 26 NB'--T .......

The power input to the mill is a direct function of cube of rotor speed, As a result the rotor speed is expected to have the maximum effect on the milling kinetics. When the rotor speed was increased from 2000 to 2600 rpm at the feed flow rate of 4 ml/see, a significant increase in the surface area was achieved. Under the conditions of 4 ml/see flowrate and 2600 rpm rotor speed, the specific area of the feed can be doubled from 4 m2/g to 8 m2/g in 60 minutes. The particle size distributions (PSD) of the milled powders follow the same trend as that of the specific surface area.

The particle size distribution has been determined routinely by two techniques: I) sedigraph, 2) microtrac. These two instruments combined give a reasonable picture of the size distribution of the particles. We measure dlo, dso, and dlo0 for a general comparison from batch to batch. The surface area is determined by BET gas adsorption using N2 as the gas. These two combined measurements give a reasonable state of the milled powder along with the oxygen values. TASK 2 Material i) Processing _nd Process Control Pcwder Process_ Effort in this unit operation includes comminution of po_der blends and addition of yttria (4w%) in aqueous suspensions using a solution precipitation technique.

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