Carbon carbon composite
Carbon carbon composite
Carbon carbon composites, refers to with carbon fiber (or graphite) and fabric as reinforcing material, carbon (or graphite) as matrix, all carbon composite prepared by carbonization processing and processing. It originated in 1958, the United States Chance-Vought company due to laboratory accidents, carbon fiber resin matrix composite curing over temperature, resin carbonization formed carbon / carbon composites.
Carbon / carbon composite material is carbon fiber reinforced carbon composite material, has the advantages of light weight, good erosion resistance, good thermal shock resistance, high damage tolerance, high strength and strong in design characteristics, should now be used in aviation, aerospace, circuit level and solar grade silicon production, high-temperature furnace application field. [1]
Carbon carbon composites
Low density <2.0g/cm3
Foreign name C-C composite carbon-carbon composite or material
High strength, high specific modulus, high thermal conductivity
order
Recording 1 carbon carbon composites overview 2 carbon carbon composites performance characteristics carbon carbon composites manufacturing technology 4 carbon carbon composite reference coefficient 3
1 carbon carbon composites overview editor
Carbon-carbon composites carbon fiber (or graphite fiber) as the skeleton to enhance the composition of carbon or stone based composite materials. Besides the properties of bulk graphite, it is superior to bulk graphite in mechanical properties, thermal shock resistance and high pressure ablation performance. But because of high cost, at present can only be used for military, brake end of long-range missile nose cone, rocket engine nozzle throat and the heat shield, high speed aircraft, and nuclear reactor in parts (carbonized polymers).
2 carbon carbon composites performance characteristics editing
(1): the physical properties of C/C composite material chemical composition after heat treatment at high temperature, the carbon is higher than 99%, low density, strong affinity, the carbon element of high melting point, high temperature resistance, corrosion resistance and thermal shock properties of good performance, acid, alkali and salt.
(2) mechanical properties: the mechanical properties of C/C composites are strength and elastic modulus, good friction and wear resistance.
(3) high temperature stability: the room temperature strength of C/C composites can be maintained to 2500 DEG C, insensitive to thermal stress and good ablation resistance.
(4) comprehensive performance evaluation: C/C composites at room temperature strength and modulus of elasticity, production of C/C composite links less, can save material and manufacturing costs, high security and reliability.
3 carbon carbon composites manufacturing technology editor
In selecting what process to prepare C/C composite materials, we should first choose what kind of fiber and matrix according to the application requirements of C/C, and then determine the preparation of fiber and matrix materials to be used.
(1) carbon fiber preparation technology: the preparation of carbon fiber raw materials used different, the process is also slightly different. If polyacrylonitrile, acrylonitrile polymerization, spinning, flame treatment, carbonation treatment, the final formation of products. If the asphalt, crude asphalt refining, melt spinning, final carbonation treatment. The quality of C/C depends primarily on the quality of carbon fiber.
(2) weaving technology: weaving technology can be divided into unidirectional weaving and multi-directional weaving. Multidirectional weaving at least two directions, up to a maximum of 11. Can also be divided into machine weaving and hand knitting. Machine knitting is subdivided into radial knitting and weft knitting. The machine knitting technology because of its easy pilling or fracture has not been used widely; weaving technology because of its products do not exist the shortcomings of knitwear and widely used at home and abroad. At present, more use of manual winding weaving and cross knitting, more advanced is the puncture weaving.
(3) densification: densification after the formation of woven or textile products. Dense technology is divided into liquid impregnation, solid impregnation and gas impregnation technology. At present, chemical vapor deposition is more important.
(4) development of process technology: chemical vapor infiltration process, computer simulation, high speed C/C composite densification technology, carbon bead / carbon process.
4 carbon carbon composite reference coefficient editor
Model apparent density flexural strength tensile strength swelling coefficient maximum operating temperature
G/cm3 Mpa (Kgf/cm2) Mpa (Kgf/cm2) * 10-6/K C
JNC13 1.35 + 0.0785 (867) 80 (612) 0.5 vacuum environment 2500
JNC15 1.63 + 0.07130 (1326) 130 (765) 0.6
JNC17 1.68 + 0.07168 (1632) 150 (969) 0.7 protection atmosphere: 3000
carbon carbon composite, graphite, graphite felt http://www.cfccarbon.com/