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Carbide Specification Checklist

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Carbide Specification Checklist

Tungsten Carbide Specification Checklist
 
Supplier:                                   
Supplier Representative:                                 
Grade/Lot:                  
Supplier ID:                     
Customer ID:                          
 
Chemical components
*All new material?
*Tungsten Carbide WC %
*Cobalt Co  %
*Other                                          
Titanium Carbide TiC  %
Iron Fe  %
Vanadium Carbide VC  %
Tantalum Carbide TaC  %
Nickel Ni  %
Chromium carbide Cr3C2 %
Niobium Carbide NbC %
 
Physical properties – Not all of these are important in every application
Actual Density g:  
Hardness (Ra):  
Abrasion resistance: 
Transverse Rupture Strength 
Tensile strength
Impact strength
Fracture toughness
Corrosion resistance
Total Binder %
Theoretical Density:          
Young’s modulus of elasticity 
Poisson’s ratio 
Compressive strength 
Fatigue strength 
Thermal Expansion coefficient
Thermal conductivity 
Thermal capacity  
Magnetic coercive force
Magnetic permeability
Magnetic Saturation (Ms)
Electrical Resistivity
 
Quality of manufacture - Microscopic examination – 1500x
Porosity – holes in the material
A  Under 10 microns 
B  10 – 25 microns
C Over 25 microns
Binder Lakes
Clusters – oversize carbide grains – low levels are not considered harmful
Number of Clusters                        
Maximum allowable cluster size microns
Largest Grain  microns
Contamination – Foreign materials 
(longest axis ______ microns
Pits (0.25in2)   voids 25 to 100 microns
Eta Phase - carbon deficient, brittle areas 
none present
Some eta phase but does not effect performance 
Unusable 
Binder lakes – large areas of binder 
Other
Grade contamination
Size variance of finished parts
Cracks
Chips
 
Finished Product Condition 
As sintered
Sandblasted
Washed – water rinse
Washed – basic solution to saponify oils and greases 
Dust free
Tumbled 
Tuffco Surface treated

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