Aluminum oxide milled nanofibers alpha alumina

Catalog	ACM1344281-59
CAS	1344-28-1
Structure
Synonyms	Al2O3, Nanofibrous inorganic powder
Molecular Formula	Al2O3
Melting Point	2072 °C
Appearance	white
Application	Alpha alumina nanofibers has applications in as an abrasive, advanced ceraminc material, electrical components, electrical insulator, thermal conductor, and as nanocomposities.
Storage	Storage Class Code: 13 - Non Combustible Solids
Conductivity	<10^-16 S/cm (Electrical)
Fiber Diameter	300-900 nm ± 100 nm
Form	nanofiber powder (fluffy)
Length	2-10 μm
Packaging	5g/10g
Specification	primary crystallite size: (alpha)
Specific Surface Area	30-50 m2/g
Thermal Conductivity	30 Wm-1K-1
Type	Polycystalline nanofibers

Case Study

How Does Alumina Nanofibers Toughen Zirconia Composites

Leonov, Andrey. Materials Today: Proceedings, 2019, 11, 66-71.

This research produced alumina toughened zirconia composites from a matrix of 3 mol.% yttria-stabilized zirconia (ZrO2) and reinforced with alumina nanofibers at concentrations of 1, 5, and 10 wt.%. The research examined the influence of Al2O3 nanofibers on the microstructural characteristics and mechanical properties of ATZ composites produced through spark plasma sintering.
Key Findings
• Sintered densities exceeding 99% of the theoretical density were achieved in the ATZ composites, with an average grain size of 0.23-0.27 μm.
• The grains in the ATZ composite exhibited a combination of intergranular and transgranular fracture modes, enhancing mechanical properties due to increased zirconia-zirconia interparticle interactions.
• Microhardness improved by 14% with the inclusion of 5 wt.% nanofiber.
• The highest fracture toughness value of 4.40 MPa·m^1/2 was attained for the composite ZN01, marking a 24% increase over monolithic ZrO2.

Effect of Alumina Nanofiber Addition on Epoxy Resin Strength

Simunin, M. M., et al. Materials, 2023, 16(4), 1343.

This study investigated how incorporating alumina nanofibers affects the mechanical properties of epoxy resin.
• Preparation of Nanocomposites
To enhance the compatibility of alumina nanofibers with epoxy resin, the fibers were first coated with epoxypropyl functional groups. Subsequently, various amounts of the coated fibers were mixed into 180 g of epoxy resin and stirred at 300 rpm for 15 minutes using an overhead stirrer, followed by ultrasonication. This process of mechanical stirring and ultrasonication was performed for three cycles. The resulting suspension was then combined with 90 g of hardener, poured into a mold, and placed in a desiccator for 24 hours at a residual pressure of 1 mbar. Finally, the samples were annealed in a drying oven at 180 °C, with a heating rate of 1 °C/min, for compositions containing alumina nanofibers at 0.05, 0.2, 0.5, 1, 2, and 4 wt.%.
• Key Findings
The ultimate flexural strength reaches its peak when the additive amount is near the percolation threshold. Specifically, the addition of 0.2% alumina increases the ultimate bending strength from 41 MPa to 71 MPa and the elastic modulus from 0.643 GPa to 0.862 GPa. Increasing the alumina nanofiber content beyond this point leads to agglomeration, causing inhomogeneity within the nanofiber structure.