Chess Project Project update presentation 3-20-08.
Post on 16-Dec-2015
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Last WeekLast Week Cast first metal pawnsCast first metal pawns
Explored surface smoothing optionsExplored surface smoothing options
Poured investment – failurePoured investment – failure
Prepared metallographic samplesPrepared metallographic samples
Strategized regarding future goalsStrategized regarding future goals
Wax Density Wax Density MeasurementMeasurement
Density measured Density measured using water using water displacement methoddisplacement method
Cast wax: Cast wax: d = 0.78 g/mLd = 0.78 g/mL
Relevant when Relevant when considering considering detatchment/floating detatchment/floating of wax during of wax during investment stageinvestment stage
Poor Investment Poor Investment DecisionDecision
Ceramic did not Ceramic did not properly hardened, properly hardened, remained soft and remained soft and wet for several dayswet for several days
Likely a problem Likely a problem with the amount of with the amount of catalyst added catalyst added (1.2% of powder (1.2% of powder weight, diluted in weight, diluted in water by 3% weight)water by 3% weight)
Salvaged wax Salvaged wax pieces, will reinvest pieces, will reinvest over spring breakover spring break
Pawn PolishingPawn Polishing
As-cast (left), sand-blasted (middle), and machine-polished (right) As-cast (left), sand-blasted (middle), and machine-polished (right) pawns are shown above. Note the difference in coloration.pawns are shown above. Note the difference in coloration.
Phase DiagramPhase Diagram Composition Composition
of received of received material at material at ~40% zinc~40% zinc
Some zinc is Some zinc is lost during lost during casting casting (moves our (moves our composition composition left on the left on the diagram)diagram)
As-Received MaterialAs-Received Material Both beta Both beta
and alpha and alpha phases phases present in present in considerable considerable amountsamounts
Few voids in Few voids in the materialthe material
100x 100x magnificationmagnification
Cast MaterialCast Material
Far less Far less alpha phase alpha phase present in present in our sampleour sample
Many voids Many voids visiblevisible
100x 100x magnificatiomagnificationn
New Cast SampleNew Cast Sample Sample from Sample from
thicket segment thicket segment of material of material takentaken
More alpha More alpha expected to be expected to be found in the found in the microstructuremicrostructure
Result of thicket Result of thicket cross section cross section and slower and slower cooling ratecooling rate
Upcoming ScheduleUpcoming Schedule Continue metallographic studiesContinue metallographic studies
Prepare more wax treesPrepare more wax trees
Pour investment, prepare for a “casting Pour investment, prepare for a “casting week” to get the bulk of our castings week” to get the bulk of our castings completedcompleted
Begin surface treatments of already cast Begin surface treatments of already cast pawnspawns
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