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  • 1
    Electronic Resource
    Electronic Resource
    Nonaqueous Aluminum Nitride Extrusion: I, Die-Entry Flow Behavior (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Simultaneous orifice and capillary rheometry at 160°C was used to determine flow parameters of aluminum nitride extrudates plasticized with a polyethylene–mineral-oil binder. Data were analyzed using the Benbow model for square-entry ram extrusion. Variables included the powder concentration, polymer molecular weight and concentration, and lubricant concentration. Die-entry rheology was explained in terms of the mean interparticle separation, polymer spatial requirements, and lubricant adsorption. Particles and polymer were observed to not pack independently. The yield stress of the body increased rapidly as the solids loading approached the critical volume limit of extrudability. An increase in polymer molecular weight or partial decrease of adsorbed lubricant increased the yield stress of the body and produced a satisfactory extrudate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00335.x
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  • 2
    Electronic Resource
    Electronic Resource
    Nonaqueous Aluminum Nitride Extrusion: II, Die-Land Flow and Tribology (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Die-land flow on extruding a nonaqueous aluminum nitride plastic body was analyzed using simultaneous orifice and capillary rheometry. Extrudate slip on the wall of the die-land was observed and concluded to involve frictional slip of extrudate particles against the die-wall and the viscous flow of an annular liquid. Results supported a model of a hydroplaning mechanism for the radial consolidation of the particle and binder network with complementary syneresis of liquid. The thickness of the apparent annular slip film was calculated to be submicrometer and to increase with an increase in the extrudate velocity and a decrease in the bulk yield stress and diameter of the die-land. The flow stress on approaching the critical volume concentration of particles terminating plastic flow increased abruptly for shear of the body in the die-entry but more gradually for slip in the die-land. Shear resistance in the die-land was significantly decreased on adding a lubricant and was very dependent on the contact stress between the particle network and the die-wall, controlled by the degree of pore saturation for an unsaturated body and the volume of particles and binder for the saturated extrudate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00336.x
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    Paper (German National Licenses)
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