Abstract
Research Summary Nanostructured ceramics and their composites possess improved properties such as tensile strength, fatigue strength, hardness, and wear resistance. Freestanding, near-net shape, nanostructured Al2O3 components can be synthesized via plasma-spray forming. In this study, plasma-spray parameters were optimized and an innovative substrate cooling technique was developed to retain nanosize Al2O3 in the spray deposit. Nanosize Al2O3 particles were partially melted and trapped between the fully melted coarser, micrometersize Al2O3grains. Densification of the spray-deposited Al2O3occurred via solidification and sintering. A similar processing approach can be adopted for fabrication of near-net shapes of a variety of nanostructured materials (metals, ceramics, and intermetallics) and their combinations by selecting suitable powder-treatment and plasmaspray parameters.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
R.S. Lima et al., “Properties and Microstructures of Nanostructured Partially Stabilized Zirconia Coatings,”J. Ther. SprayTech., 10(1) (2001), pp. 150–152.
J. He et al., “Thermal Stability of Nanostructured Cr3C2-NiCr Coatings,”J. Ther. Spray Tech., 10 (2) (2001), pp. 293–300.
L.L. Shaw et al., “The Dependency of Microstructure and Properties of Nanostructured Coatings on Plasma Spray Conditions,”Surf. Coat. Tech., 130 (2000), pp. 1–8.
Y. Zhuetal., “Tribological Properties of Nanostructured and Conventional WC-Co coatings Deposited by Plasma Spraying,”Thin Solid Films, 388 (2001), pp. 277–282.
Y. Wang et al., “Abrasive Wear Characteristics of Plasma Sprayed Nanostructured Alumina/Titania Coatings,”Wear, 237 (2000), pp. 176–185.
H. Chen and C.X. Ding, “Nanostructured Zirconia Coating Prepared by Atmospheric Plasma Spraying,”Surf. Coat. Tech., 150 (2002), pp. 31–36
A. Agarwal and T. McKechnie, “Spray Forming Aluminum Structures,”Advanced Mater. Process, 159 (5) (2001), pp. 44–46.
A. Agarwal et al., “Advances in Near Net Shape Forming and Coating of Erosion Resistant Ultra High Temperature Materials” (Paper presented at the Tri-Service Sponsored Symposium on Advancements in Heatshield Technology, Huntsville, Alabama, May 2000, U.S. Army Aviation & Missile Command, SR-RD-PS-00-01).
R. Hickman, T. McKechnie, and A. Agarwal, “Net Shape Fabrication of High Temperature Materials for Rocket Engine Components” (Paper presented at the 37th A/AA/ASME/SAE/ASEE/Joint Propulsion Conference, Salt Lake City, Utah, 8–11 July 2001, AIAA-2001-3435).
A. Agarwal and I McKechnie,Low Cost Fabrication of Lightweight Optics, Mirrors and Benches, NASA Goddard Space Flight Center, Technical Report NAS5-0008 (November 2001).
G. Li, A. Jiang, and L. Zhang, “Mechanical and Fracture Properties of Nano AI2O3,”J. Mater. Sci. Lett. 15 (19) (1996), pp. 1713–1715.
A. Agarwal, T. McKechnie, and S. Seal, “Net Shape Nanostructured Aluminum Oxide Structures Fabricated by Plasma Spray Forming”, communicated toJ. Thermal. SprayTech., accepted (July 2002).
TAPP, A Database of Thermochemical and Physical Properties, v. 2.2 (Hamilton, OH: ESM Software Inc., 1998).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Agarwal, A., McKechnie, T. & Seal, S. The spray forming of nanostructured Aluminum Oxide. JOM 54, 42–44 (2002). https://doi.org/10.1007/BF02709093
Issue Date:
DOI: https://doi.org/10.1007/BF02709093