A review of heat treatment on polyacrylonitrile fiber

Handbook of SiC properties for fuel performance modeling

With their impressive individual properties, carbon nanotubes should form high-performance fibers. We explored the roles of nanotube length and structure, fiber density, and nanotube orientation in achieving optimum mechanical properties. We found that carbon nanotube fiber, spun directly and continuously from gas phase as an aerogel, combines high strength and high stiffness (axial elastic modulus), with an energy to breakage (toughness) considerably greater than that of any commercial high-strength fiber. Different levels of carbon nanotube orientation, fiber density, and mechanical properties can be achieved by drawing the aerogel at various winding rates. The mechanical data obtained demonstrate the considerable potential of carbon nanotube assemblies in the quest for maximal mechanical performance. The statistical aspects of the mechanical data reveal the deleterious effect of defects and indicate strategies for future work.

https://science.sciencemag.org/content/sci/318/5858/1892.full.pdf

High-performance carbon nanotube fiber.

Humankind's aerospace aspirations are placing unprecedented demands on vehicle propulsion systems. Advanced structural ceramics are playing a key role in addressing these challenges.

Advanced structural ceramics in aerospace propulsion.

Composites science and technology

The tensile behavior of carbon fibers at high temperatures up to 2400 °C

A micromechanics-based approach to the mechanical behavior of brittle-matrix composites

Damage and failure in ceramic matrix minicomposites: Experimental study and model

Relations between fracture toughness and fiber/matrix interphases were examined on various SiC/SiC composites made by chemical vapor infiltration (CVI) and reinforced with woven fiber bundles. Strong and weak fiber/matrix bondings were obtained using multilayered interphases consisting of various combinations of carbon and SiC layers of different thickness and using fibers which had been previously treated. Fracture toughness was estimated using the J-integral and using strain energy release rate computed with a model taking into account the presence of a process zone of matrix microcracks. Both approaches evidenced similar trends. It appeared that higher toughness was obtained with those composites possessing strong interphases and subject to dense matrix microcracking.

Fracture Toughness of 2‐D Woven SiC/SiC CVI‐Composites with Multilayered Interphases

Pyrocarbon (PyC), the common interphase for SiC/SiC, is not stable under severe environmental conditions. It could be replaced by boron nitride more resistant to oxidation but poorly compatible with nuclear applications. Other materials, such as ternary carbides seem promising but their use in SiC/SiC has not been demonstrated. The most efficient way to improve the behavior of PyC interphase in severe environments is to replace part of PyC by a material displaying a better compatibility, such as SiC itself. Issues related to the design and behavior of layered interphases are reviewed with a view to demonstrate their interest in high-temperature nuclear reactors.

Jacques Lamon

Papers

The tensile behavior of carbon fibers at high temperatures up to 2400 °C

A micromechanics-based approach to the mechanical behavior of brittle-matrix composites

Damage and failure in ceramic matrix minicomposites: Experimental study and model

Fracture Toughness of 2‐D Woven SiC/SiC CVI‐Composites with Multilayered Interphases

Single‐ and Multilayered Interphases in SiC/SiC Composites Exposed to Severe Environmental Conditions: An Overview