3M Nextel™ 720 Composite Ceramic Fiber

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3M Nextel™ 720 Composite Ceramic Fiber
Categories:	Ceramic; Oxide; Aluminum Oxide; Silicon Oxide; Other Engineering Material; Composite Fibers
Material Notes:	Chemical composition above is wt%. Filament diameter is 10-12 µm. 3M Nextel Ceramic Fibers 610, 650, and 720 are composite grade fibers. They have a refined crystal structure based on alpha-Al₂O₃ and do not contain glassy phases. This allows the fibers to retain their strength at high temperatures. 3M Nextel Fiber 720, an alpha-Al₂O₃ with SiO₂ addition (forming alpha-Al₂O₃/mullite), has improved strength retention at temperature due to reduced grain boundary sliding. The SiO₂ addition also help to 'pin' the grains and reduce grain growth when exposed to thermal aging. Information provided by 3M Ceramic Textile and Composites.
Key Words:	Alumina, Aluminum Oxide
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Physical Properties	Metric	English	Comments

Density	3.40 g/cc	0.123 lb/in³
Particle Size	<= 0.50 µm	<= 0.50 µm	Crystal size
Specific Surface Area	<= 0.20 m²/g	<= 0.20 m²/g

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	2100 MPa @Thickness 25.4 mm	305000 psi @Thickness 1.00 in	gauge filament
Tensile Modulus	260 GPa	37700 ksi	Filament property

Thermal Properties	Metric	English	Comments
CTE, linear	6.00 µm/m-°C @Temperature 100 - 1100 °C	3.33 µin/in-°F @Temperature 212 - 2010 °F
Melting Point	1800 °C	3270 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.67	1.67

Descriptive Properties
Color	Green

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CMMM06 / 1617

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