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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 q *Actual Density g q *Hardness (Ra) q *Abrasion resistance q *Transverse Rupture Strength q *Tensile strength q *Impact strength q *Fracture toughness q *Corrosion resistance q Total Binder % q Theoretical Density: q Young’s modulus of elasticity q Poisson’s ratio q Compressive strength q Fatigue strength q Thermal Expansion coefficient q Thermal conductivity q Thermal capacity q Magnetic coercive force q Magnetic permeability q Magnetic Saturation (Ms) q Electrical Resistivity
Quality of manufacture - Microscopic examination – 1500x Porosity – holes in the material q A Under 10 microns q B 10 – 25 microns q C Over 25 microns q Binder Lakes Clusters – oversize carbide grains – low levels are not considered harmful q Number of Clusters q Maximum allowable cluster size microns q Largest Grain microns Contamination – Foreign materials q (longest axis ______ microns q Pits (0.25in2) voids 25 to 100 microns Eta Phase - carbon deficient, brittle areas q none present q Some eta phase but does not effect performance q Unusable Binder lakes – large areas of binder Grade contamination q Size variance of finished parts q Cracks q Chips
q Finished Product Condition q As sintered q Sandblasted q Washed – water rinse q Washed – basic solution to saponify oils and greases q Dust free q Tumbled q Tuffco Surface treated
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