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Susceptibility of Different Slurry Types to Agglomeration Mark Litchy 1 , Don Grant 1 , and Reto Schoeb 2 1 CT Associates, Inc. 2 Levitronix GmbH Levitronix CMP Users Conference 2009 February 10, 2009
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]
Experiment performed ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Experiment details ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
9 CMP Slurries Evaluated ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pumps Evaluated ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pump Comparison ,[object Object],[object Object],[object Object],[object Object]
Working particle size distributions (PSDs) ,[object Object]
Silica slurry: Example of UFA/SMPS measurement ,[object Object],[object Object],[object Object],[object Object],[object Object]
S1 slurry:  Working PSD measurements (DLS)
A1 slurry:  Working PSD measurements (DLS)
Summary of changes in working PSD
Large Particle Tail PSDs in As-Received Slurry
S1 slurry:  BPS-200/BPS-600 Pumps
S1 slurry:  BPS-4, bellows, and diaphragm pumps
S2 slurry
S3 slurry
S4 slurry
S5 slurry
A1 slurry
A2 slurry
C1 slurry
C2 slurry
Concentration increases measured after 100 turnovers
Concentration increases measured after 100 turnovers (cont’d)
Concentration increases measured after 100 turnovers (cont’d)
Concentration increases measured after 1,000 turnovers
Concentration increases measured after 1,000 turnovers  (cont’d)
Concentration increases measured after 1,000 turnovers  (cont’d)
Summary of changes in large particle concentrations
Summary ,[object Object],[object Object],[object Object]
Summary of effect of pumps on slurry properties ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Diaphragm  and Bellows pumps ,[object Object],[object Object],[object Object],BPS-4 pump Other Slurry Parameters Large Particle Tail Working PSD Pump Type PSD

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Susceptibility of different slurry types to agglomeration