High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers

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Description

Boron nitride powder with less than or equal to the oxygen content of starting powder (down to 0.5% or less) is hot isostatically pressed in a refractory metal container to produce hexagonal boron nitride with a bulk density greater than 2.0 g/cc. The refractory metal container is formed of tantalum, niobium, tungsten, molybdenum or alloys thereof in the form of a cansister or alternatively plasma sprayed or chemical vapor deposited onto a powder compact. Hot isostatic pressing at 1800{degrees}C and 30 KSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.21 g/cc. Complex shapes can be ... continued below

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13 p.

Creation Information

Hoenig, C. L. December 31, 1990.

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This patent 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 11 times. More information about this patent can be viewed below.

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Description

Boron nitride powder with less than or equal to the oxygen content of starting powder (down to 0.5% or less) is hot isostatically pressed in a refractory metal container to produce hexagonal boron nitride with a bulk density greater than 2.0 g/cc. The refractory metal container is formed of tantalum, niobium, tungsten, molybdenum or alloys thereof in the form of a cansister or alternatively plasma sprayed or chemical vapor deposited onto a powder compact. Hot isostatic pressing at 1800{degrees}C and 30 KSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.21 g/cc. Complex shapes can be made.

Physical Description

13 p.

Notes

OSTI; NTIS; GPO Dep.

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  • Other Information: PBD: 1990

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  • Other: DE92017197
  • Report No.: PATENTS-US--A7539393
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 10163519
  • Archival Resource Key: ark:/67531/metadc1342041

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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

  • December 31, 1990

Added to The UNT Digital Library

  • Nov. 28, 2018, 2:33 p.m.

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  • March 11, 2019, 1:33 p.m.

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Hoenig, C. L. High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers, patent, December 31, 1990; California. (https://digital.library.unt.edu/ark:/67531/metadc1342041/: accessed September 15, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.