NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Synthesis and Thermal Conductivity of Exfoliated Hexagonal Boron Nitride/Alumina Ceramic CompositeExfoliated hexagonal boron nitride (hBN)/alumina composite can be fabricated by following the process of (1) heating a mixture of hBN, AlCl3, and NaF in nitrogen for intercalation; (2) heating the intercalated product in air for exfoliation and at the same time converting the intercalate (AlCl3) into Al2O3, (3) rinsing the oxidized product, (4) coating individual exfoliated hBN platelets that contain Al2O3 with new layers of aluminum oxide, and finally, (5) hot pressing the product into the composite. The composite thus obtained has a composition of approximately 60 percent by weight hBN and 40 percent by weight alumina. Its in-plane and through-plane thermal conductivity were measured to be 86 and 18 watts per meter Kelvin, respectively, at room temperature.
Document ID
20170003135
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Hung, Ching-cheh (NASA Glenn Research Center Cleveland, OH, United States)
Hurst, Janet (NASA Glenn Research Center Cleveland, OH, United States)
Santiago, Diana (NASA Glenn Research Center Cleveland, OH, United States)
Lizcano, Maricela (NASA Glenn Research Center Cleveland, OH, United States)
Kelly, Marisabel (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
April 7, 2017
Publication Date
April 1, 2017
Subject Category
Composite Materials
Fluid Mechanics And Thermodynamics
Report/Patent Number
NASA/TM-2017-219472
GRC-E-DAA-TN39140
E-19345
Funding Number(s)
WBS: WBS 081876.02.03.05.02.04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available