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| Application Process |
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| Twin Wire Arc Spraying (TWAS) |
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| Material Chemistry (wt%) |
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| Chromium |
< 22% |
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| Boron |
< 5% |
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| Molybdenum |
< 5% |
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| Niobium |
< 5% |
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| Carbon |
< 2% |
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| Manganese |
< 1% |
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| Silicon |
< 1% |
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| Iron |
Balance |
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| Microhardness (HV300) |
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| 1064 - 1234 kg/mm² |
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Microhardness (Average)
Elevated Temperature |
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| 1030 kg/mm² |
70° F |
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| 912 kg/mm² |
300° F |
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| 620 kg/mm² |
600° F |
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| 309 kg/mm² |
1200° F |
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| 117 kg/mm² |
1400° F |
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| Wear Resistance |
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| ASTM G65-04 Procedure B |
| 2,000 cycles mass loss |
0.15 g |
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| Elevated Temperature Erosion |
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Using coal fired boiler fly ash for
20 minutes at 30° impact angle (α)
at 1200° F |
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Volume loss |
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α = 30° |
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| SHS 8000 TWAS |
1.50 |
| LMC Armacor™ M |
3.05 |
| 1018 steel plate |
8.47 |
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| Bond Strength |
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ASTM C633-01
0.020 in thick coating |
| 1018 Steel |
8,000 - 11,400 |
psi |
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| Coating Properties |
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| Density (g/cm³) |
7.30 |
| Porosity/Oxides |
< 5% |
| Coefficient of Friction |
0.32 |
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| Thermal Expansion |
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Temperature |
Slope |
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100 - 500° C |
8.53 |
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| Thermal Conductivity |
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Temperature |
Slope |
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23° C |
4.280 |
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50° C |
4.678 |
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75° C |
5.055 |
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100° C |
5.269 |
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125° C |
5.505 |
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150° C |
5.707 |
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| Impact Resistance (Toughness) |
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| Drop Impact Testing |
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No cracking/delamination at 480 in-lbs |
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Coating Description
SHS 8000 TWAS is a glass forming iron based alloy that forms a nanocomposite comprised of a mixed amorphous and nanoscale microstructure when sprayed as a coating. SHS 8000 features high wear resistance, elevated temperature erosion resistance and a unique high hardness/toughness combination.
Key Performance Characteristics |
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Excels in elevated temperature environments where fly ash and bed ash erosion occur |
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Superior bond strength without necessity of bond coat |
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Hardness increases as a function of time and temperature |
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SHS 8000 coatings exhibit excellent combinations of corrosion and wear resistance, superior bond strength and high impact resistance. Superior bond strength values signify that this material has exceptional adhesion and cohesion. This also highlights the material’s extremely low residual stress (even at high thicknesses) inherent in this coating type. The probability of “pull-out” of individual particles during wear, erosion and other service conditions is extremely low. Low coating permeability results in a highly corrosion resistant barrier. Low oxide content contributes to high bond strength due to the very limited presence of internal voids and other defects. These characteristics provide predictable coating performance across a broad variety of service environments. SHS 8000 is especially resistant to elevated temperature oxidation, erosion and corrosion for protecting boiler tubes in coal fired boilers.
Elevated Temperature Erosion Resistance
SHS 8000 combines erosion and corrosion resistance with high hardness in elevated temperature environments where fly ash and bed ash erosion occurs. Based on results from aggressive accelerated elevated temperature erosion tests with highly erosive fly ash from a coal fired boiler at 30° and 90° impact angles, SHS 8000 coatings can provide increased lifetime over carbon steel substrate and leading industry standard protective coatings.
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Impact Resistance
Impact testing on SHS 8000 coatings was performed using a Gardner Impact testing machine with a 12 lb test weight and 0.5” diameter impact punch dropped from 40” height. As-sprayed and heat-treated (one hour soak at 600° C, water quenched) coatings of 0.020” in thickness were tested. The as-sprayed and heat-treated coatings survived 480 in-lbs impact and demonstrated the ability to deform with the substrate without chipping, cracking or delaminating.
Universal Applicability
When SHS 8000 is sprayed directly onto substrate alloys using conventional twin wire thermal spray equipment and standard substrate preparation practices, and without a bond coat, extremely high bond strength is achieved. In Adhesion/Cohesion ASTM C633-01 Bond Strength Tests, extremely high bond strength is achieved for SHS 8000 coatings on plain carbon steel, far exceeding bond strength of conventional coating materials.
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SHS Products 
SHS 8000 TWAS 
