Key Performance Characteristics

 
SHS 9570 TWAS coatings feature high impact resistance and excellent corrosion resistance while maintaining high wear resistance. The superior bond strength values of this coating signify that this material has exceptional adhesion and cohesion. The high adhesion values highlight the extremely low residual stress (even at high thicknesses) that is an inherent factor in coatings of this type. High cohesion values mean that the probability of “pull-out” of individual particles is extremely low during wear, erosion and other service conditions. Low porosity means low coating permeability, resulting in a highly corrosion resistant barrier. Low oxide content is another key ingredient contributing to the high bond strength of this SHS coating 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. Because SHS 9570 has been designed to develop extreme passive film stability at a range of pH in both oxidizing and reducing environments, it is a viable alternative to nickel superalloys and stainless steels, offering significantly better wear performance than either material.

Excellent Corrosion Resistance
SHS 9570 has been designed to optimize glass forming ability so that it readily forms nearly perfect metallic glass coatings when thermal sprayed. In the X-ray diffraction diagram of an as-sprayed SHS 9570 coating, the broad amorphous hump and almost complete lack of Bragg diffraction peaks indicate that the coating structure is primarily a metallic glass. Note that a metallic glass represents the ultimate in uniformity and even considering the extended short range order {up to 20 Å (2 nm)}, it is still considered an Angstrom scale material. This extreme, almost atomic-level homogeneity makes it very difficult for the electrochemical system to set up specific sites for anodic attack. Simultaneously, the chemistry of SHS 9570 was optimized so that an extremely stable passive protective oxide layer forms in a wide range of both oxidizing and reducing environments. The combined approach of optimizing both the passive film stability and the extreme refinement of the coating microstructure, results in revolutionary corrosion resistance in a variety of environments. SHS 9570 has been designed to be complimentary to SHS 7570 as a high corrosion resistant TWAS wire and is expected to perform better in specific corrosion/chemical environments.

Damage Tolerance
SHS 9570 coatings exhibit superior toughness and resiliency. Impact tests on this coating were performed using a Gardner Impact testing machine at different impact energies. As-sprayed SHS 9570 coatings withstood 120, 240, 360 and 480 in-lbs of impact energy during testing without cracking, chipping or delaminating, while also demonstrating the ability to deform with the substrate.

Spray Parameters
For SHS 9570 TWAS spray parameters, contact NanoSteel at 1-877-293-NANO or info@nanosteelco.com.