Download - Page 1 of 24 Designing multi-anvil assemblies: The COMPRES cell assembly project Kurt Leinenweber
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Designing multi-anvil assemblies:Designing multi-anvil assemblies:The COMPRES cell assembly The COMPRES cell assembly
projectproject
Kurt LeinenweberKurt Leinenweber
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Challenges:Challenges:
• Thermocouple has to work wellThermocouple has to work well
• Wide range of P and T desirable for Wide range of P and T desirable for each assemblyeach assembly
• Easy to assembleEasy to assemble
• Not expensiveNot expensive
• Specs have to be repeatable from year Specs have to be repeatable from year to year (well-documented)to year (well-documented)
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Five sizes of octahedra - 8 mm, 10 mm, 14 mm, 18 mm and 25 mm - used in the COMPRES assemblies.
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The octahedra showing the sample holes already molded in.
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GasketingGasketing
Gasket setup using pre-cut paper and pre-milled gaskets, shown on the bottom 4 cubes of the “nest.”
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Gasketing (cont.)Gasketing (cont.)
Pre-cut paper that is used to position the gaskets.
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Gasketing (cont.)Gasketing (cont.)
ASU’s shop foreman, Rick Flubacher, and an automated mill.
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Trial milling of pyrophyllite gaskets on a programmable mill.
Gasketing (cont.)Gasketing (cont.)
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COMPRES machinist, Brian Nagy, and the COMPRES automated lathe.
Gasketing (cont.)Gasketing (cont.)
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Cutting thermocouple slots in a lanthanum chromite sleeve for the 8/3 assembly on the automated lathe.
AssemblyAssembly
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Rhenium furnace (size 5.4 mm by 8 mm) cut using wire EDM (Electrical Discharge Machining), for the 8/3 assembly.
Assembly (cont.)Assembly (cont.)
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The 8/3 assembly with the lanthanum chromite sleeve and the rhenium furnace in place.
Assembly (cont.)Assembly (cont.)
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Beam path (green) through the 8/3 assembly (courtesy of Emmanuel Soignard).
Modification for x-rayModification for x-ray
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NEW: Special rhenium furnace design for in-situ x-ray experiments in the 8/3 assembly, including a central slit for the x-ray beam.
Modification for x-ray (cont.)Modification for x-ray (cont.)
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“COMPRES care packages” ready for shipping.
TestingTesting
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“Big blue” multi-anvil at ASU (frame is from Clifton Fluid Power, Inc.; module made in-house).
Testing (cont).Testing (cont).
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14/8 “G2” assembly after squeezing.
Testing (cont).Testing (cont).
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Results for three “locked” assembliesResults for three “locked” assemblies
• Calibration curves• Success rates• Suitability for offline and in-situ work
• (note: because development of too many new things can be confusing, we “lock” certain designs so that they won’t change, while we continue to develop others).
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14/8 “Caltech” assembly (lanthanum chromite step-heater)
14/8 “Caltech” assembly14/8 “Caltech” assembly
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14/8 “Caltech” assembly thermal profile14/8 “Caltech” assembly thermal profile
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14/8 “G2” assembly14/8 “G2” assembly
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8/3 assembly8/3 assembly
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8/3 assembly (cont): room temperature calibration.8/3 assembly (cont): room temperature calibration.
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8/3 assembly (cont.): Thermal profile.8/3 assembly (cont.): Thermal profile.
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8/3 assembly (cont.) Effect of temperature on pressure.8/3 assembly (cont.) Effect of temperature on pressure.
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10/5 “Tami” assembly10/5 “Tami” assembly10/5 Power Curve from APS experiments
0
50
100
150
200
250
300
350
400
450
500
0 200 400 600 800 1000 1200 1400 1600
Temperature (oC)
Po
we
r (W
)
T0556
T0558
T0560
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Pressure Calibration of 10/5 Assembly (CsCl pressure standard)
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5
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25
0 100 200 300 400 500 600 700 800
Force (Tons)
Pre
ssu
re (
GP
a)
1000oC
25oC
10/5 “Tami” assembly (cont.): Pressure calibration10/5 “Tami” assembly (cont.): Pressure calibration
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Effect of temperature on pressure of 10/5 assembly (CsCl pressure standard)
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0 200 400 600 800 1000 1200 1400 1600
Temperature (oC)
Pre
ssu
re (
GP
a)
700 tons
500 tons
400 tons
10/5 assembly (cont.): Effect of temperature on pressure10/5 assembly (cont.): Effect of temperature on pressure