Thermal fatigue testing of a diffusion-bonded beryllium divertor mock-up under ITER relevant conditions

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Thermal response and thermal fatigue tests of four 5 mm thick beryllium tiles on a Russian divertor mock-up were completed on the Electron Beam Test System at Sandia National Laboratories. The beryllium tiles were diffusion bonded onto an OFHC copper saddleblock and a DSCu (MAGT) tube containing a porous coating. Thermal response tests were performed on the tiles to an absorbed heat flux of 5 MW/m{sup 2} and surface temperatures near 300{degrees}C using 1.4 MPa water at 5.0 m/s flow velocity and an inlet temperature of 8-15{degrees}C. One tile was exposed to incrementally increasing heat fluxes up to 9.5 MW/m{sup ... continued below

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5 p.

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Youchison, D.L.; Guiniiatouline, R. & Watson, R.D. December 31, 1994.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this article can be viewed below.

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  • Youchison, D.L. Pennsylvania State Univ., University Park, PA (United States)
  • Guiniiatouline, R. D.V. Efremov Scientific Research Institute of Electrophysical Apparatus, St. Petersburg (Russian Federation)
  • Watson, R.D. Sandia National Labs., Albuquerque, NM (United States)

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Thermal response and thermal fatigue tests of four 5 mm thick beryllium tiles on a Russian divertor mock-up were completed on the Electron Beam Test System at Sandia National Laboratories. The beryllium tiles were diffusion bonded onto an OFHC copper saddleblock and a DSCu (MAGT) tube containing a porous coating. Thermal response tests were performed on the tiles to an absorbed heat flux of 5 MW/m{sup 2} and surface temperatures near 300{degrees}C using 1.4 MPa water at 5.0 m/s flow velocity and an inlet temperature of 8-15{degrees}C. One tile was exposed to incrementally increasing heat fluxes up to 9.5 MW/m{sup 2} and surface temperatures up to 690{degrees}C before debonding at 10 MW/m{sup 2}. A third tile debonded after 9200 thermal fatigue cycles at 5 MW/m{sup 2}, while another debonded after 6800 cycles. In all cases, fatigue failure occurred in the intermetallic layers between the beryllium and copper. No fatigue cracking of the bulk beryllium was observed. During thermal cycling, a gradual loss of porous coating produced increasing sample temperatures. These experiments indicate that diffusion-bonded beryllium tiles can survive several thousand thermal cycles under ITER relevant conditions without failure. However, the reliability of the diffusion bonded Joint remains a serious issue.

Physical Description

5 p.

Notes

INIS; OSTI as DE96001943

Source

  • 18. European symposium on fusion technology (SOFT-18), Karlsruhe (Germany), 22-26 Aug 1994

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  • Other: DE96001943
  • Report No.: SAND--95-2325C
  • Report No.: CONF-940843--19
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 123262
  • Archival Resource Key: ark:/67531/metadc627269

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  • December 31, 1994

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 1:34 p.m.

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Youchison, D.L.; Guiniiatouline, R. & Watson, R.D. Thermal fatigue testing of a diffusion-bonded beryllium divertor mock-up under ITER relevant conditions, article, December 31, 1994; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc627269/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.