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Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 1 COMPRES Multi-anvil cell assembly development.

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Presentation on theme: "Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 1 COMPRES Multi-anvil cell assembly development."— Presentation transcript:

1 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 1 COMPRES Multi-anvil cell assembly development Kurt Leinenweber, James Tyburczy (Arizona State University)

2 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 2 Some collaborators: »Caltech (Jed Mosenfelder) 14/8, 8/3 (requested) »Case Western (Jim Van Orman) 8/3 »Canberra (Tom Sharp) 8/3 »American Museum of Natural History (Rondi Davies) 8/3 »Urbana Champaign (Jie Li) 8/3 »Carnegie (Yingwei Fei, Shantanu Keshav and Alexandre Corgne) 8/3 »Stony Brook (Jiuhua Chen) 6 mm mullite cubes on order; 8/3 request; 8 mm mullite cut

3 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 3 Some more collaborators: »Daresbury (David Price, Ray Jones, Ed Bailey). In- situ calibration of “hybrid” assemblies »Argonne (Yanbin Wang) In-situ calibration of “opaque” assemblies. (At ASU: development of 8/3, 10/5, 14/8 assemblies)

4 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 4 Design considerations Try to achieve: 1.High precision. 2.High success rates. 3.Low cost, ready availability. 4.Consistency between laboratories. 5.Consistency over time. The best developments are those that have many or all of these characteristics at once.

5 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 5 Steps to increase precision »Think about all the variables that could affect the pressure. »Eliminate them if possible. Gasket placement could affect the pressure.Problem avoided by using pre-cut paper.

6 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 6 Precision (cont.) » Octahedron injection- molded. » Rhenium furnace cut by EDM. » LaCrO 3 sleeve turned and slotted by lathe. » Alumina inner pieces made on a dicing saw.

7 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 7

8 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 8 Steps to increase success rates » Obtain a more exact description of popular “lore”. » Keep track of success rates for different configurations - change them if the success rate could be higher. » Also: good fit of octahedron and gaskets; use of “nesting plates.” Pre-slotted octahedron (new)

9 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 9 New pressure media Injection-molded octahedra (MgO/spinel). Also: mullite cubes are being made for the DIA.

10 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 10 Automated lathe Slotting a lanthanum chromite sleeve Lathe (note the hood attachment!)

11 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 11 Gaskets! »The current rate-limiting step for this project! »We are improving our automated milling, and testing laser-cutting. The best technique will depend on the size (smaller gaskets: laser. Larger gaskets: milling).

12 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 12 Consistency between laboratories Strain cube

13 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 13

14 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 14 Consistency over time Document the sources of materials, and their properties (composition, density, dimensions, etc.). Beware of products that may be discontinued!

15 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 15 Upcoming developments: »Develop 10/5, 18/11, and 25/15 COMPRES assemblies. »New 14/8: “zero thermal gradient, x-ray transparent” assembly with smaller pressure loss at very high T. »New ceramics: In hand: forsterite insulation, spinel insulation, TiB 2 /BN machinable composite furnace, mullite pressure medium. In development or proposed: TiO 2 insulation, SiC furnace. »(Also could use: a better pressure standard for temperatures above 1200 - 1400 °C).

16 Kurt Leinenweber – Arizona State University COMPRES Annual Meeting 2004 – Lake Tahoe, CA ~ June 21, 2004 Page 16 Upcoming plans: »Hands-on training course at Argonne (joint between this project and Y. Wang). (not during Sept shutdown or Dec/Jan holidays at Argonne). »Cell design “summit meeting” in Arizona? »Continued collaborations, developments, and data gathering with the COMPRES assemblies.


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