Knowde Enhanced TDS
Identification & Functionality
- Product Type
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
Applications & Uses
- Markets
- Applications
- Application Area
- Application Method
- Compatible Substrates & Surfaces
- Applications
Hardide-A has been developed specifically to meet the needs of the aerospace and power generation industries. It is an environmentally compliant and technically superior replacement for HCP and HVOF coatings, providing enhanced protection against corrosion and chemically aggressive media, wear, galling, fretting and fatigue. Hardide-A matches HCP in thickness and hardness and outperforms the material in several key properties including enhanced protection against corrosion, wear and chemically aggressive media. The transition from hard chrome to Hardide-A is facilitated for customers as no significant changes are necessary in part dimensions or drawings.
Testing has shown that Hardide-A has very high resistance to Water Droplet Erosion (WDE) - a problem in steam and gas turbines. WDE causes severe roughening of the turbine blade surface due to bombardment from high speed water droplets. Coating steam and gas turbine blades can help increase maintenance intervals. Preventing the roughening of blades by WDE reduces turbine rotational drag and improves generating efficiency, contributing towards reduced CO2 emissions.
Hardide-A is an excellent pore-free barrier against corrosion and some chemically aggressive media. The coating has enhanced toughness and high hardness (62-74 HRc) and provides durable protection even in severe applications where corrosion is combined with abrasive wear or erosion. It can also be used where a thicker coating is required.
• Can be applied to internal and external surfaces and complex shapes uniformly
• Smooth, uniform as-coated surface finish minimizes 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 door pins, bushes, bearings, hooks, catches, landing gear, flap tracks and slats, sleeves, rods, valves, pistons, actuators, compressors, shafts, hydraulic and pneumatic cylinders
Properties
- Typical Properties
- Key Properties
Coating Thickness Typically 50 - 100 microns (0.002 - 0.004”)Coating Toughness Excellent. Good resistance to impact and thermal shock. High load capability.Strain to Fracture Higher than 0.3% (3000 microstrain)Fatigue Minimal change in fatigue debit, ranging from +10% to -10%Adhesion Tensile Bond Strength Greater 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)
*Adhesive glue can separate at lower valuesCoating Composition Tungsten with nano-structured Tungsten Carbide
Does not contain Cobalt or other metal binder materials used in Cemented Carbides and thermal spray coatingsCoating Porosity < 0.5% as measured in accordance with ASTM E2109Appearance Coating as applied is light gray
Finishes to a high metallic luster when polishedFinishing Operations Grinding, Honing, Lapping, Polishing, Super-finishingSurface Finish As coated, has a smooth conformal finish. Typically, surface roughness after light polishing will be similar to the part before coating.
Without the need for grinding can be polished to 0.2 - 0.3 microns Ra
(8 - 12 μin) and with grinding, super finished to 0.02 microns Ra (0.8 μin)Corrosion Resistance Resistant to acids, H2S and aggressive chemicals
Passed 750 hours neutral salt spray corrosion test ASTM B117Coating Temperature Typically up to 500°C / 932°F max
| Value | Units | Test Method / Conditions | |
| Electrical Resistivity (20°C) | 5.5 | microhm-cm | — |
| Linear Coefficient of Expansion | 4.3 x 10-⁶ | ºC | — |
| Density (20ºC) | 19.3 | gm/cc | — |
| Thermal Conductivity @ 20oC | 174.0 | W/m·K | — |
| Specific Heat Capacity @ 20oC | 0.132 | J/g·K | — |
| Microhardness (Hv) | 800 - 1200 Hv | kgf/mm2 | — |
Regulatory & Compliance
- Certifications & Compliance
- Certifications
Hardide Coatings’ UK and USA manufacturing sites are approved to ISO 9001 and aerospace AS 9100 certification. The UK site is also accredited to Nadcap and ISO 14001.