Carbon and graphite discs and plates
Standard SEM stubs are nearly all made from aluminium and sometimes brass which can be undesirable for X-ray analysis and other imaging methods. For small specimens, powders, fibres and particles in solution the finish of the stub and the material of the stub can also interfere with imaging and analysis. In such cases a carbon disc with a high quality surface finish can be used to mount the specimen being analysed.
Carbon (graphite) or vitreous carbon discs from Micro to Nano can be placed between the stub and the specimen to form a protective shield and prevent interference from the aluminium stub surface.
Vitreous carbon is superior in hardness, surface finish, mechanical and chemical stability. The table below shows which materials are best for which application. Generally speaking, vitreous carbon is the better choice, but for less demanding applications carbon (graphite) discs/plates can be used.
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|
||
Smooth surface |
V |
X |
Hard surface |
V |
X |
Easy to clean and re-use |
V |
O |
SE imaging |
V |
X |
BSE imaging |
V |
V |
X-ray microanalysis |
V |
V |
Spectral Analysis |
V |
O |
Aqueous Solutions |
V |
X |
Pricing |
O |
V |
High purity |
V |
V |
Conductivity |
V |
V |
Packaging |
Each |
Packs of 10 / or 5 |
V= Best O= Medium X= Not Recommended
Physical properties of HG grade vitreous carbon |
|
Maximum temperature (vacuum or inert gas),ºC |
3000 |
Density, g/cm3 |
1.42 |
Hardness, Vickers, HV |
230 |
Permeability coefficient, cm2/s |
10-9 |
Open porosity, % |
0 |
Young’s Modulus, GPa |
35 |
Compressive strength, Gpa |
0.48 |
Flexural strength, Gpa |
0.26 |
Thermal conductivity (30ºC) W/km |
6.3 |
Electrical Resistance (30ºC), Ωµm |
45 |
Thermal Expansion Coefficient (20-200ºC), /K |
2.6×10-6 |
Ordering information:
-
High purity graphite planchet/disc 10.0 x 1.6mm
High urity graphite planchet / disc 10.0 x 1.6mm (pkg/10)
£16.13 Add to basket -
High purity graphite planchet or disc, 12.7 x 1.6mm
High purity graphite planchet or disc, 12.7 x1.6mm (pkg/10)
£11.20 Add to basket -
High purity graphite planchet or disc, 25.4 x 1.6mm
High purity graphite planchet or disc, 25.4 x 1.6mm (pkg/10)
£15.05 Add to basket -
High purity graphite planchet or disc 32.0 x 1.6mm
High purity graphite planchet or disc 32.0 x1.6mm (pkg/10)
£17.40 Add to basket -
High purity vitreous carbon planchet/disc 12.7 x 2.0mm
High purity vitreous carbon planchet / disc 12.7 x 2.0mm (each)
£101.25 Add to basket -
High purity vitreous carbon plancets disc 19.0 x 2.0mm
High purity vitreous carbon plancets / disc 19.0 x 2.0mm (each)
£123.64 Add to basket -
High purity graphite plate- 50 x 50 x 1mm
High purity graphite plate – 50 x 50 x 1mm (pkg/5)
£23.05 Add to basket -
High purity vitreous carbon planchet/disc 25.0 x 3.0mm
High purity vitreous carbon planchet / disc 25.0 x 3.0mm (each)
£137.37 Add to basket -
High purity vitreous carbon planchet/disc 32.0 x 3.0mm
High purity vitreous carbon planchet / disc 32.0 x 3.0mm (each)
£178.08 Add to basket -
High purity graphite plate- 100 x 50 x 2mm
High purity graphite plate – 100 x 50 x 2mm (pkg/5)
£46.56 Add to basket -
High purity graphite plate- 100 x 100 x 2mm
High purity graphite Plate- 100 x 100 x 2mm (pkg/5)
£84.17 Add to basket -
High purity vitreous carbon plancets/disc 10.0 x 2.0mm
High purity vitreous carbon plancets / disc 10.0 x 2.0mm (each)
£95.65 Add to basket