Cellular Materials, which combines high specific stiffness, high specific strength, and high energy absorption, can be applied in the fields of composite materials, environment, energy, and biology. The construction of ultra-light materials with a density lower than 10 mg/cm3 is currently an international research hotspot, such as the superlattice structure of metal (Ni-P), ceramic (Al2O3)-based and the like. However, as the density decreases, the mechanical and electrical properties of these materials decrease exponentially (n>2). At the same time, the stability of the material structure and the recoverable deformation significantly deteriorate. Scientists have long dreamed of carbon-based cellular materials, consisting of carbon nanotubes or graphene, with excellent mechanical and electrical properties. This requires that the structural units (between carbon tubes or graphene sheets) be covalently bonded but difficult to achieve.
Recently, the Shanghai Institute of Ceramics, the Chinese Academy of Sciences, the University of Pennsylvania, and Peking University have cooperated in research. Bi Hui, Chen Yijun, and Huang Fuqiang have discovered a "super material" for three-dimensional graphene tubes (Figure 1). The new cellular material with a graded porous structure is both superior to existing carbon materials in terms of strong mechanical properties, low density, and high electrical conductivity. The density of the graphene macro can be as low as 1 mgcm-3 (continuously adjustable) and the specific surface area can be as high as 1000 m2g-1. The three-dimensional graphene is firstly bonded by four-linked graphene nanotubes through carbon-carbon covalent bonds to form a diamond-like four-coordinate three-dimensional stable structure.
The three-dimensional graphene tube has high strength, compression modulus up to 100 MPa, can support 40,000 times its own weight, no significant deformation (Figure 2), but also has high elasticity, compression deformation of more than 95%, after 1000 cycles Almost completely recoverable, it is the highest of all cellular materials. Graphene hollow tube material has excellent electrical conductivity, electrical conductivity up to 70 Scm-1, three-dimensional graphene tube can be used as an excellent elastic conductor, its mechanical and electrical properties are 1-2 orders of magnitude of porous graphene reported so far. High, can be applied to new energy fields. In addition, the material has super-hydrophobic characteristics, the adsorption of organic solvents is fast, the adsorption of organic solvents up to 600 times its own weight, can be used for sewage treatment, such as oil spills at sea.
The related work was funded by the National Natural Science Foundation of China and the Shanghai Municipal Science and Technology Commission. The relevant results were published in the academic magazine Advanced Materials (DOI: 10.1002/adma.201502682).
Tantalum Parts include Tantalum target ,Tantalum crucible and Tantalum Boat .Tantalum parts can be made any size and configuration. Dimensions and tolerances are according to customer's drawings. Price depends on size, complexity, configuration, and additional requirements specified in the order .
Designation
Chief component
Impurities max(%)
Ta
Fe
Si
Ni
W
Mo
Ti
Nb
O
C
H
N
Ta1
Remainder
0.004
0.003
0.002
0.004
0.004
0.002
0.03
0.015
0.004
0.0015
0.002
Ta2
Remainder
0.01
0.01
0.005
0.02
0.02
0.005
0.08
0.02
0.01
0.0015
0.01
Mechanical requirements (annealed condition)
|
Grade(UNS) |
Annealed |
||
|
Tensile strength min, psi (MPa) |
Yield strength min,psi (MPa)(2%) |
Elongation min, % (1 inch gage length) |
|
|
Pure Ta (RO5200, RO5400) |
30000 (207) |
20000 (138) |
20 |
|
Ta-10W (RO5255) |
70000 (482) |
60000 (414) |
15 |
|
Ta-2.5W (RO5252) |
40000 (276) |
30000 (207) |
20 |
|
Ta-40Nb (RO5240) |
35000 (241) |
20000 (138) |
25 |
Tantalum Parts
Tantalum Parts,Puretantalum Crucible,Tantalum Boat,Mo1 Molybdenum Crucible
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