NDLI: Zirconia–alumina–nanodiamond composites with gemological properties

Content Provider	Springer Nature Link
Author	Díaz, Luis A. Montes Morán, Miguel A. Peretyagin, Pavel Y. Vladimirov, Yuriy G. Okunkova, Anna Moya, José S. Torrecillas, Ramón
Copyright Year	2014
Abstract	Nanodiamonds have excellent mechanical and optical properties with a wide range of potential applications as a filler material for nanocomposites. Here, we present a new family of zirconia–alumina–nanodiamond composites using two main processing routes: (1) a colloidal method, and (2) power mixing homogenization. Composites with detonation nanodiamonds quantities ranging within 0.3–5 vol.% followed by a pulsed electrical current sintering at a temperature range from 1,200 to 1,500 °C have been analyzed, and a significant enhancement in mechanical properties, i.e., indentation hardness (16.17 GPa), fracture toughness (15.5 MPa m$^{1/2}$), and bending strength (1,600 MPa), could be observed. To support these excellent properties, TEM, color, reflectivity, and Raman spectroscopy measurements were also carried out. The microstructure of the composites is very homogeneous with average grain sizes between 200 and 500 nm depending on the processing temperature. Two morphologies are present: (a) intergranular dispersion of alumina grains and nanodiamonds distributed along the grain boundaries of the ZrO$_{2}$ matrix, and (b) intragranular nano-dispersion of ZrO$_{2}$ particles with sizes 20–80 nm located inside the alumina grains. In the present article, we show, for the first time in the scientific literature, a continuous palette of gray color gradation of new ceramic materials of metalized colors (white index L* 98–40) for gemological applications.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	16
Issue Number	2
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-01-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zirconia Alumina Nanodiamond Composites Ceramic materials Gemological properties Pulsed electric current sintering (PECS) Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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