TUNGSTEN FIBER REINFORCED NICKEL COMPOSITES Page: 4 of 25
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TUNGSTEN FIBER REINFORCED NICKEL COMPOSITES
R. K. Robinson and P. L. Farnsworth
Internal stresses which build up in nuclear reacto fuel elements~during- irradiation
sometimes result in rupture o the fuel element cladding material. The development
of stronger cladding materials is required if fuel elements capable of operating
for longer times, at higher burn-ups, and at higher temperatures are to be produced.
One of the most promising approaches to increasing the strength (particularly at
high temperatures) of cladding matetals is the development of fiber-reinforced.
composites. Numerous methods exist for consolidating fiber-reinforced composites
into dense, useful materials having a variety of applications. One rather
unique powder metallurgy technique is a high energy-rate forming method known
as pneumatic impaction. While pneumatic impaction is not new, per se, some of
its applications in cermet and composite consolidation and forming at Battelle-
Northwest are new, This report deals with some preliminary results of reinforcing
unalloyed nickel matrices with tungsten fibers by pneumatic impaction.
II. SUMMARY AND CONCLUSIONS
Composite plates containing nominally 10 volume percent continuous, aligned tungsten
fibers (0.001 inch diameter) in pure nickel matrices were successfully prepared
by pneumatic impaction. Good bonding between fibers and matrix and high
densities (r499 percent of theoretical) were achieved during impaction. Little
or no breakage 'of the fibers occurred during fabrication and, for the most part,
the fibers remained straight throughout the specimen length. Transverse sections
of the composites.iridicated a random distribution of the fibers although they were
loaded in an ordered' array.
Significant increases in both the yield strength and the ultimate tehsile strength
were obtained in the contihttous, axially aligned fiber reinforce nickel composite.
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Robinson, R.K. & Farnsworth, P.L. TUNGSTEN FIBER REINFORCED NICKEL COMPOSITES, report, March 15, 1965; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1025118/m1/4/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.