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1 with a decreased particle size what sintering mechanisms become relatively more important why2 consider two glass
1 explain how the migration direction is determined at the beginning of diffusion-induced grain boundary migration2
1 draw a schematic figure and explain the grain growth velocity as a function of grain size from 001 to 100mum for a
1 if grain growth is affected by gas diffusion in pores with a constant pressure what is the activation energy of grain
describe the basic assumptions involved in the microstructure development map in figure 112 and discuss their validity
draw schematically the g-rho trajectories and explain for two powder compactsa with different green densities low and
1 derive equations of pore migration bya gas diffusion andb evaporationcondensation2 for pore migration movement by gas
1 for a system where abnormal grain growth usually occurs during sintering what possible measures can be taken to
consider fine and coarse powders of the same chemical composition during sintering of the powders a fine powder compact
consider a perfectly coherent diffusion layer on a large single crystal surfacea explain the state of the elastic
liquid film migration occurred when solute atoms were added to a liquid phase sintered body if the migration direction
consider a system where densification occurs by lattice diffusion and grain growth by surface diffusiona describe how
describe possible processes for preparing sintered compacts with the following microstructuresa fully densified
1 when the oxygen concentration of an air-sintered pure oxide is decreased by annealing in a reducing atmosphere by how
the major defects in kcl are known to be schottky-type and the formation free energy of the cation vacancy is lower
1 describe the basic assumptions of the lsw theory and discuss its results and implication2 consider two separate
1 consider a liquid phase sintering material containing inert second-phase spheres sketch and explain the growth shapes
the pore filling theory of liquid phase sintering predicts that the densification of powder compacts is determined by
the grain shape of nbc in a co liquid varies between a well-faceted cube and a sphere depending on annealing
1 explain why densification is in general faster in liquid phase sintering than in solid state sintering2 consider
1 explain the densification and shrinkage processes in the pore filling model and theory of liquid phase sintering what
a describe a possible method to estimate the activation energy of densification during liquid phase sinteringb what are
1 according to the pore filling theory the shrinkage of a compact occurs by a successive accommodation and recovery of
1 the improvement of densification by an external gas pressure after pore isolation is far more pronounced in liquid
part 1 chemistry1 examine the following unbalanced chemical equation co c rarr co which of the following is the