Hot pressed niobium carbide--graphite composites. Progress report

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Declassfied 30 Aug 1973. An investigation was conducted to determine the manufacturability of hot-pressed 75--25 wt% NbC--graphite composites. Commercially available and custom ground superfine carbide and graphite powder combinations were evaluated; the hot pressing operation was studied; and machining techniques were developed. The relationship of the physical properties of the starting powders to thermal and mechanical properties of the composites was studied. Room temperature and 2400 deg C tensile, compressive, and flexural strengths were determined; tensile creep at 24OO deg C and compressive deformation (creep) at 2200 deg C were studied; and thermal expansion and specific heat to 5000 deg ... continued below

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Pages: 61

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Blay, J.S. June 1, 1967.

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Description

Declassfied 30 Aug 1973. An investigation was conducted to determine the manufacturability of hot-pressed 75--25 wt% NbC--graphite composites. Commercially available and custom ground superfine carbide and graphite powder combinations were evaluated; the hot pressing operation was studied; and machining techniques were developed. The relationship of the physical properties of the starting powders to thermal and mechanical properties of the composites was studied. Room temperature and 2400 deg C tensile, compressive, and flexural strengths were determined; tensile creep at 24OO deg C and compressive deformation (creep) at 2200 deg C were studied; and thermal expansion and specific heat to 5000 deg F were determined. In addition, the effect of a post hot-pressing heat treatment was studied. Evaluation of results shows that equally dense, high strength composites can be obtained by hot-pressing large or small billets. For the composition studied, the resulting structure of the superfine carbide graphite powders was a weak carbide continuous phase in a dominant continuous graphite phase. The resulting structure from commercially available carbide/graphite powders was a dominant carbide network. Optimum mechanical properties were obtained both at room temperature and at high temperature, using normal commercially available high purity powders. Thermal properties do not appear to be dependent on the physical properties of the powders. A post hot-pressing hightemperature heat treatment is important in improving the dimensional stability of the billets. Ultrasonic material removal techniques developed for rough machining and diamond tooling developed for final machining provided an economical high production method for manufacturing composite hardware. (auth)

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Pages: 61

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Dep. NTIS

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  • Other Information: Declassified 30 Aug 1973. Orig. Receipt Date: 30-JUN-74

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  • Report No.: WANL-TME--1630
  • Grant Number: SUBNP-1
  • DOI: 10.2172/4406241 | External Link
  • Office of Scientific & Technical Information Report Number: 4406241
  • Archival Resource Key: ark:/67531/metadc1025753

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • June 1, 1967

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

Description Last Updated

  • Oct. 20, 2017, 3:49 p.m.

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Blay, J.S. Hot pressed niobium carbide--graphite composites. Progress report, report, June 1, 1967; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc1025753/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.