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Saturday, July 25, 2020 | History

3 edition of High frequency ultrasonic characterization of sintered SiC found in the catalog.

High frequency ultrasonic characterization of sintered SiC

High frequency ultrasonic characterization of sintered SiC

  • 310 Want to read
  • 12 Currently reading

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Ultrasonics.,
  • Ceramics.,
  • Quality assurance -- United States.

  • Edition Notes

    StatementGeorge Y. Baaklini, Edward R. Generazio, and James D. Kiser.
    SeriesNASA technical memorandum -- 100825.
    ContributionsGenerazio, Edward R., Kiser, James D., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14663925M

    Ultrasonics, vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 term sonic is applied to ultrasound waves of very high amplitudes. Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies greater than 10 13 hertz. At such high frequencies it is very difficult for a sound wave to. A high frequency ( MHz), longitudinal wave mode, pulse-reflection UNDE method was developed to evaluate a range of densities ( to g/cm 3) of ceramics (reaction bonded Si 3 N 4, sintered SiC, hot pressed Si 3 N4 and hot.

    11th Annual Conference on Composites and Advanced Ceramic Materials; Table of Contents; Correlation Between Ultrasonic Velocity and Density of Ceramic Turbine Blades; NDE and Fracture Studies of Hot-Pressed Si3N4; High Frequency Ultrasonic Characterization of Sintered Sic; Characterization of Porosity in Green-State and Partially Densified. The as-sintered density of silicon carbide fabrication and void characterization is given in reference focussing moderately high frequency ultrasonic energy (30 to MHz) on a small spot, raster scanning the lens with respect to the sample, and time-gate.

      The high frequency vibration of ultrasonic stimulation through its nearly point-like introduction has a significant influence on material removal behavior. The machining of slots with diamond cutters and full coverage, results in a larger contact area between the work-piece and tool. Publikations-Datenbank der Fraunhofer Wissenschaftler und Institute: Aufsätze, Studien, Forschungsberichte, Konferenzbeiträge, Tagungsbände, Patente und Gebrauchsmuster.


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High frequency ultrasonic characterization of sintered SiC Download PDF EPUB FB2

Click on the book chapter title to read by: 2. High‐frequency 60‐ to ‐MHz ultrasonic nondestructive evaluation was used to characterize variations in density and microstructural constituents of sintered SiC bars. Ultrasonic characterization methods included longitudinal velocity, reflection coefficient, and precise attenuation by: Get this from a library.

High frequency ultrasonic characterization of sintered SiC. [George Y Baaklini; Edward R Generazio; James D Kiser; United States.

High frequency to MHz ultrasonic nondestructive evaluation was used to characterize variations in density and microstructural constituents of sintered SIC bars. Ultrasonic characterization methods included longitudinal velocity, reflection coefficient, and precise attenuation measurements.

The. Abstract High-frequency to MHz ultrasonic nondestructive evaluation was used to characterize variations in density and microstructural constituents of sintered SiC bars. Ultrasonic characterization methods included longitudinal velocity, reflection. G.Y. Baaklini, E.R. Generazio, and J.D.

Kiser, “High Frequency Ultrasonic Characterization of Sintered SiC,” presented at the 11th Annual Conference on Composition and Advanced Ceramic Materials, Jan.

18–23,Cocoa Beach, FL. Ultrasonic Characterization of the Elastic Anisotropy in Aluminum-SiC and -Al2O3 Metal Matrix Composites. Materials Characterization Using High-Frequency Atomic Force Microscopy and Friction Force Microscopy. Ultrasonic Response in Nd-Fe-B Sintered.

Correlation between ultrasonic velocity and density of ceramic turbine blades / P.K. Khandelwal, P.W. Heitman -- NDE and fracture studies of hot-pressed Si₃N₄ / R.A. Roberts, J.P. Singh, J.J. Vaitekunas -- High frequency ultrasonic characterization of sintered SiC / George Y.

Baaklini, Edward R. Generazio, James D. Riser -- Characterization of porosity in green-state and partially. A silicon carbide disk was sintered from {sup 0} to {sup 0}C in 25{sup 0}C steps. After each sintering step, the disk was examined using a precision acoustic scanning system to determine.

Velocity-Density Characterization in Green and Sintered Ceramics and Powder Metals Several samples of green and sintered Al 2 O 3 of known density were characterized for ultrasonic velocity in order to establish reference relationship, for comparison with unknown density samples.

Introduction. Non-destructive evaluation (NDE) techniques such as ultrasound, X-ray tomography and photothermal microscopy have manifested themselves in the material characterization and damage identification of composites, ceramics and metallic materials, which are the typical structural materials in the highly value-added industries of aerospace and biomedical devices [, ].

Composites with five different volume fractions of SiC were prepared for complete ultrasonic characterization and these ranged from to The composite specimens meant for ultrasonic characterization were machined to a size of 25 mm × 25 mm × 5 mm out of a large block of Al/SiC p MMC.

The thicknesses of the specimens were measured. Ultrasonic Characterization and Defect Detection in Piezoelectric Materials has been studied in the present thesis in view of its piezoelectric and high-frequency elastic properties.

LiNbO3 is currently intensively used for piezoelectric, as well as Mechanical Characterization of Sintered Piezoelectric Ceramic Material Using.

A precursor to high frequency non-contact transducers was the development of piezoelectric dry coupling longitudinal and shear wave transducers up to 25MHz frequency. Sincethese transducers have been commercially available for characterizing thickness, velocity, elastic and mechanical properties of green, porous, and dense materials.

Books Journals Engineering Research. Applied Mechanics and Materials Advances in Science and Technology International Journal of Engineering Research in Africa Advanced Engineering Forum Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Abstract.

The development of a database for the ultrasonic NDE of advanced-ceramic components is described. High frequency (≤ MHz), high power transducer development was involved and the probes are used to examine model spherical inclusions (voids (≥20 μm), ZrO 2, MgO, V 2 O 5 and Pt inclusions (≥30 μm)) in model matrices (glass, crystallized glass and partially stabilized zirconia).

High frequency Non-Contact Ultrasonic (NCU) analysis of materials has been a persistent dream of materials engineers and scientists. However, a natural impediment to NCU is the exorbitant acoustic impedance mismatch between air and the test materials.

The magnitude of this obstacle is further exacerbated in the Megahertz frequencies, necessary for high resolution. Book. TOC. Actions. Share.

Ceramics – Processing, Reliability, Tribology and Wear High Temperature Behaviour of Liquid Phase Sintered Silicon Carbide (Pages: ) Giuseppe Magnani; Gian Loris Minoccari; Luigi Pilotti; Summary; Microstructural Development and High Frequency Characterization of Bulk YBa 2 Cu 3 O 7–x.

Keywords: hybrid machining, SiC, ultrasonic assisted grinding, diamond tools 1. INTRODUCTION Advanced ceramics are divided based on their material characterization as oxides, non-oxides and silicate ceramics. Due to the shared covalent bond and narrow atomic distances between molecules, these materials are characterized by high.

During primary processing, the breaking of agglomeration of nano particles take place and these are mixed with liquid aluminum powder using high frequency(35kHz) mechanical vibration.

But, during secondary processing, mixing of nano particles along with subsequent cooling take place using high frequency non contact ultrasonic method. a cm diameter contact ultrasonic transducer operating on pulse-echo mode.

The flight time is determined through the thickness of the tile, which includes the time of the sent ultrasonic signals from the top surface reaching to the bottom of the tile and being reflected back (Fig.

1). The center frequency of the transducer was 5 MHz.Characterization of Liquid Phase Sintered SiC Ceramics with Oxide Additive Materials Authors: Sang Ll Lee, Yun Seok Shin, Jin Kyung Lee, Joon Hyun Lee, Jun Young Park Abstract: This paper dealt with the fabricating process of liquid phase sintered (LPS) SiC ceramics containing the oxide additives of Al2O3 and Y2O3, in conjunction with the.3.

Experimental Setup for Acoustics Filed Pressure Measurement. In order to measure the ultrasonic field generated by the transducer prototypes, a hydrophone system was used (75 μm needle hydrophone) in combination with an ultrasonic scanning system [].For performing the ultrasonic scan, the transducer prototype was moved by a 3D actuation system, so that the ultrasonic field in planes.