Combinatorial synthesis of ceramic materials
a ceramic material and combinatorial synthesis technology, applied in the field of library preparation, can solve the problems of inability to measure many crucial properties, inability to prepare and inability to predict the preparation of new materials with novel and useful chemical and/or physical properties
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example i
[0048] Yttria and alumina powders were blended in the correct molar ratio to yield YAG (Y3Al5O12) upon sintering. A slurry containing 50% solids was prepared as follows:
[0049] 256.76 g Y2O3=51.352 ml
[0050] 193.24 g Al2O3=48.553 ml
[0051] 4.5 g Darvan 821A (40% solution in the bottle)
[0052] 80.5 ml Deionized Water
[0053] 11.25 g MBAM
[0054] 3.75 g PEG(1000)DMA
[0055] 0.10 μl TEMED and 1.0 μl 10% APS per 1 gram weight of slurry
[0056] The mixture was ball milled overnight using 200 grams of media in a 1 liter mill. The mixture was cast into a rectangular plate using standard gelcasting procedures and dried. Cavities were drilled into this plate extending to about half its thickness. The drilled plate (substrate) was then gradually rehydrated to its original gelcast state. The substrate was first set on a flat support above a volume of water in a closed container and allowed to stand overnight. The next day the entire assembly was gradually heated to 50° C., held overnight, then fur...
example ii
[0057] Slurry prepared as described in Example I is modified by the addition of selected combinations and amounts of rare earth elements and deposited into the cavities of a substrate prepared in accordance with Example I. The substrate is then heated to cause the newly introduced slurries to gel, after which the substrate with deposited materials is dried again and fired to form a solid test plate having an array of zones of distinct compositions. The general sequence of process steps is shown in FIG. 9.
[0058] Rehydration may be accelerated when the slurry has been modified by the addition of plasticizers. The use of plasticizers is taught generally in U.S. Pat. No. 6,228,299 issued on May 8, 2001 to Janney, et al., incorporated herein by reference. Plasticizers may be added as desired in any suitable concentration; the addition of plasticizers is not critical to the practice of the present invention. As a general example, a conventional 100 g gelcasting premix solution with 15% m...
example iii
[0060] A substrate is prepared as described in Example I containing:
[0061] 904.0 g CN-20 Ni—Zn ferrite powder 500° C. (calcined to remove binders)
[0062] 2.68 ml Darvan 821A (40% solution in the bottle)
[0063] 142.55 ml Deionized Water
[0064] 21.56 g MBAM
[0065] 3.59 g MAM
[0066] 0.15 μl TEMED and 1.5 μl 10% APS per 1 gram weight of slurry.
[0067] Test slurries are deposited into the cavities of the substrate and a test plate is prepared as described in Example II. The test plate, with its resulting range of compositions, can be interrogated with a small sensing coil to determine local magnetic properties. Small areas having some desired combination of properties could subsequently be analyzed by microprobe or the like to determine the actual composition that gives the desired properties.
[0068] The importance of piezoelectric transducers and actuators for applications in a wide range of systems that encompass military, commercial, and medical applications is constantly increasing....
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