ALUMINA (Al₂O₃) fibers in composites are used primarily because:

Question

Accepted Answer

B. {'text': 'High temperature stability + electrical insulation + chemical resistance — used in CMCs and high-temperature insulating composites', 'label': 'B'}

Alumina (Saffil, Nextel) is chemically inert, electrically insulating, and stable to ~1600°C. Used in CMC turbine components and refractory insulating composites. Higher density than carbon, lower strength — a specialty fiber.

Answer

{'text': 'High electrical conductivity', 'label': 'D'}

Answer

{'text': 'Low cost', 'label': 'A'}

Answer

{'text': 'Low density', 'label': 'C'}