3M Nextel™ 650 Composite Ceramic Fiber

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3M Nextel™ 650 Composite Ceramic Fiber (discontinued **)
Categories:	Ceramic; Oxide; Aluminum Oxide; Other Engineering Material; Composite Fibers
Material Notes:	Chemical composition above is wt%. Crystal phases are alpha alumina + yttria stabilized zirconia. 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 650, an alpha-Al₂O₃ with Y₂O₃ and ZrO₂ additions, has improved strength retention at temperature due to reduced grain boundary sliding. The Y₂O₃ and ZrO₂ additions 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	4.10 g/cc	0.148 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	2550 MPa @Thickness 25.4 mm	370000 psi @Thickness 1.00 in	filament
Tensile Modulus	358 GPa	51900 ksi	Filament property

Thermal Properties	Metric	English	Comments
CTE, linear	8.00 µm/m-°C @Temperature 100 - 1100 °C	4.44 µin/in-°F @Temperature 212 - 2010 °F
Melting Point	1710 °C	3110 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.77	1.77

Component Elements Properties	Metric	English	Comments
Al2O3	89 %	89 %
Y2O3	1.0 %	1.0 %
ZrO2	10 %	10 %

**
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CMMM04 / 1616

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