Hardide-T Coating
Tough, ductile and impact resistant coating for use in extremely abrasive and erosive environments.
Hardide-T has enhanced toughness and is suitable for heavy duty applications in extremely abrasive and erosive environments where a thicker coating (typically 50 microns) is required or in applications involving shock loads where impact resistance is required.
Hardide-T properties include:
- Can be applied to both internal and external surfaces, including complex shapes uniformly
- Smooth, uniform as-coated surface minimises expensive grinding and finishing operations
- Easily applied to a wide range of metallic substrates including ferrous and nickel-based alloys, and most grades of stainless and carbon steels
- Applications include downhole tools, valves, flow control components, pumps, sealing and bearing surfaces, heavy duty earth-moving equipment, hydraulics, powder compaction, tool & die, and any components requiring barrier to hydrogen.
- Industries served include oil and gas, aerospace, petrochemical, valves, pumps, material processing, power generation, steam and industrial gas turbines, industrial production tooling, pulp and paper processing, food manufacturing and motorsport.
Key properties
| Parameter | Hardide-T |
| Microhardness [kgf/mm2] | 1100 – 1600100 |
| Coating Thickness | Typically 50 – 100 microns (0.002) |
| Coating Toughness | Excellent. Good resistance to thermal shock. |
| Strain to Fracture | Higher than 0.3% (3000 microstrain) |
| Adhesion Tensile Bond Strength | Better than 70 MPa or 10,000 psi
Under standard bond test ASTM C633-01, the Hardide coating adhesion bond has been proven to be higher than the adhesive ultimate strength of 70 MPa (10,000 psi) |
| Coating Composition | Tungsten with nano-structured Tungsten Carbide
Does not contain Cobalt or other metal binder materials used in Cemented Carbides and thermal spray coatings |
| Coating Porosity | < 0.5% as measured in accordance with ASTM E2109 |
| Appearance | Coating as applied is light gray
Finishes to a high metallic lustre when polished |
| Finishing Operations | Grinding, Honing, Lapping, Polishing, Super-finishing |
| Surface finish | As coated 0.4 – 0.6 microns Ra / 16-24 μin
Can be polished to 0.2 – 0.3 microns Ra / 8 – 12 μin Can be super-finished to 0.02 microns Ra / 0.8 μin |
| Corrosion Resistance | Resistant to acids, H2S and some aggressive chemicals
Passed NACE 30 day Sulphide Stress Cracking (SSC) test to NACE TM0177-2005/ASTM G39-Method B (1 bar H2S) Passed 480 hours neutral salt spray corrosion test ASTM B117 |
| Coating Temperature | Typically 460° – 520°C / 860° – 968°F dependent on the substrate |
| Electrical Resistivity @ 20°C | 5.5 microhm-cm |
| Linear Coefficient of Expansion | 4.3 x 10-6 per ºC |
| Density @ 20ºC | 19.3 (gm/cc) |
| Thermal Conductivity @ 20ºC | 174 W/m·K |
| Specific Heat Capacity @ 20ºC | 0.132 J/g·K |