Fabrication and Characterization of Graded Impedance Gas Gun Impactors from Tape Cast Metal Powders

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Fabrication of compositionally graded structures for use as light-gas gun impactors has been demonstrated using a tape casting technique. Mixtures of metal powders in the Mg-Cu system were cast into a series of tapes with uniform compositions ranging from 100% Mg to 100% Cu. The individual compositions were fabricated into monolithic pellets for characterization by laminating multiple layers together, thermally removing the organics, and hot-pressing to near-full density. The pellets were characterized by optical and scanning electron microscopy, X-ray diffraction, and measurement of density and sound wave velocity. The density and acoustic impedance were observed to vary monotonically (and nearly ... continued below

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Martin, L P & Nguyen, J H November 21, 2005.

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Fabrication of compositionally graded structures for use as light-gas gun impactors has been demonstrated using a tape casting technique. Mixtures of metal powders in the Mg-Cu system were cast into a series of tapes with uniform compositions ranging from 100% Mg to 100% Cu. The individual compositions were fabricated into monolithic pellets for characterization by laminating multiple layers together, thermally removing the organics, and hot-pressing to near-full density. The pellets were characterized by optical and scanning electron microscopy, X-ray diffraction, and measurement of density and sound wave velocity. The density and acoustic impedance were observed to vary monotonically (and nearly linearly) with composition. Graded structures were fabricated by stacking layers of different compositions in a sequence calculated to yield a desired acoustic impedance profile. The measured physical properties of the graded structures compare favorably with those predicted from the monolithic-pellet characteristics. Fabrication of graded impactors by this technique is of significant interest for providing improved control of the pressure profile in gas gun experiments.

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PDF-file: 37 pages; size: 6.6 Mbytes

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  • Journal Name: Materials Science and Engineering, A, A427, n/a, January 6, 2006, pp. 83-91

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  • Report No.: UCRL-JRNL-217359
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 899395
  • Archival Resource Key: ark:/67531/metadc886453

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  • November 21, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 28, 2016, 2:36 p.m.

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Martin, L P & Nguyen, J H. Fabrication and Characterization of Graded Impedance Gas Gun Impactors from Tape Cast Metal Powders, article, November 21, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc886453/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.