BlueSteel™ C/C General Properties GROUP Satisfy Your Progress®


The most important class of properties of carbon-carbon composites is their thermal properties. BlueSteel™ C/C composites have very low thermal expansion coefficients, making them dimensionally stable at a wide range of temperatures, and they have high thermal conductivity. BlueSteel™ C/C composites retain mechanical properties even at temperatures (in non- oxidizing atmospheres) above 2000°C.


They are also highly resistant to thermal shock, or fracture due to rapid and extreme changes in temperature. The material properties of a BlueSteel™ C/C composite vary depending on the fiber fraction, fiber type selected, textile weave type and similar factors, and the individual properties of the fibers and matrix material. For this reason NTT manufacturing phases are checked three times prior, during and after the C/C process.


Fiber properties depend on precursor material, production process, degree of


graphitization and orientation, etc. The tensioning step in fiber formation is critical in making a fiber (and therefore a composite) with any useful strength at all. Matrix precursor material and manufacturing method have a significant impact on composite strength. Sufficient and uniform densification is necessary for a strong composite.


Generally, the elastic modulus is very high, from 15-20 GPa for composites made with a 3D fiber felt to 150-200 GPa for those made with unidirectional fiber sheet. Other properties include low-weight, high abrasion resistance, high electrical


conductivity, low


hygroscopicity, non-brittle failure, and resistance to biological rejection and chemical corrosion. Carbon-carbon composites are very workable, and can be formed into complex shapes.


What is Generation IV


Generation IV is a multinational collaboration for the research, development, and construction next generation pilot nuclear power plant by 2015.


Under Generation IV several options are being studied internationally:  Very High Temperature Gas-Cooled Reactor  Gas-Fast Reactor  Molten Salt Reactor  Super Critical Water Reactor  Lead Fast Reactor  Sodium Fast Reactor


Generally speaking in a VHTR the application of carbon/carbon has produced since early tests very good result, as it is a composite combination with graphite-like features.


NTT Group has developed a line of expertise in various power management industries, and under the Generation IV project it has included studies mostly for VHTR and MSR.


The most interesting part of this application is relating to its relatively low costs compared with benefits of many different applications in the nuclear power plant.


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