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Additional info for Ceramic Technology for Advanced Heat Engines [prog rpt Oct 89 - Mar 90]
Experiments with a variety of target materials, film sensitivity, exposure conditions, filters, and mating surfaces are being conducted to offset the thickness gradient. l_mination) was acquired for improved real time imaging. This camera does not suffer from target depletion, a problem encountered with Plumicon type cameras. A converted Dage camera (x-ray sensitive vedicon with a I-inch CSI screen) was installed to achieve high magnifications. d. nt_: indented at various loads cracks with known lengths and optimization study.
NDE results later confirmed that there was a reduction in defects. Molding Batch C was used Lo compare gate designs G2 and G3. The analysis showed that there was little difference between the 'two gate designs, as noted earlier, and that the barrel temperature and injection pressure profiles are significant. This is shown by the contour plot in Figure 6 which indicates an area of temperatures and pressures yielding 'the fewest defects. The water milled powder was used to prepare Batch D. This was used with gate G2 to confirm the results of the preceding experiments and to investigate another mold design feature, 47 sprue size or mold opening.
Figure 2 comparing the two gate designs, G2 and G3, shows that there is little difference between the two designs based on voids. Both gate designs are capable of molding tensile bars of similar quality and indicate that some other factor, such as residual stress or ease of molding, should determine the choice of gate design. Finite Ele_t MQdeling The finite element modeling required of two steps; first, materials characterization and then the modeling. The materials characterization determined the density, specific heat,thermal conductivity, rheology and pressure-volume-temperature behavior of the ceramic molding compound.