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Additional info for Ceramic Technology for Advanced Heat Engines [prog rpt Oct 89 - Mar 90]
Several pressure cast discs were also analyzed by mercury porosimetry for Y203 concentration and by SEM for possible particle segregation during casting. The samples submitted for porosimetry were cast from slurries containing no binder and binders B3, B5 (previously used), BII and B12 and were fired in air at 600°C. The porosimetry results are shown in Table I. The data of Table ! shows that the highest packing density was obtained without binder and that aging of the suspension resulted in lower density.
Also, the TGA for Y(OH) 3 showed that the full conversion to Y203 occurs between 800_;C and 900°C with a 35% weight loss. Therefore, the calcination of Y(OH) 3 to a 1000°C is needed to give a corresponding oxygen for Y203. However, the oxidation of Si3N4 needs to be minimized. Various calcination treatments in vacuum and/or nitrogen to 800°C have consistently shown additional oxygen pick up. The final value of the oxygen on the presintered bar as well as on the MOR bars after HIP'ing and machining have also been determined using LECO analysis.
This "mixed" system was evaluated for casting. 1 MPa, remained in one piece after drying. However, some surface cracks 42 developed during drying. These surface cracks may be attributed to segregation caused by low i25 w/o) solids suspension. Glossy upper surface of these specimens corroborate the segregation hypothesis, lt is anticipated that crack free specimens could be cast using higher solids loading in the suspension. Crack free discs cast from i) aqueous suspensions of alcohol milled powders and 2) "mixed suspensions" obtained by blending Y203 powder with water milled Si_N_ suspension were analyzed by mercury porosimetry.