Key Performance Characteristics

 
SHS 9172 TWAS coatings excel in extreme environments where severe abrasion is encountered, particularly when wear is combined with corrosion or high temperature oxidation. SHS 9172 also features superior bond strength and toughness. Superior bond strength values of this coating signify that this material has exceptional adhesion and cohesion. High adhesion values highlight the extremely low residual stress (even at high thicknesses) that is an inherent quality 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 provides low coating permeability, resulting in a highly corrosion resistant barrier. Low oxide content is another key ingredient contributing to the high bond and inter lamellar strength of this SHS coating due to the low incidence of internal voids and other defects. These characteristics provide predictable coating performance across a variety of service environments. SHS 9172 has been developed to produce deposits that have extreme resistance to abrasion and a significant ability to withstand corrosion and high temperature oxidation. SHS 9172 represents a breakthrough in the development of TWAS wires with exceptional hardness and wear resistance which form an amorphous/nanoscale structure during solidification without needing to fill the core with ceramics or hard metals. The extremely fine microstructure improves toughness and provides exceptional wear resistance in applications involving fine particle abrasion and erosion.

Abrasion/Erosion Resistance
SHS 9172 is a glass forming steel alloy formulated with high concentrations of transition metals which readily dissolve in the glass structure. When sprayed using benchmark parameters, an amorphous matrix forms which contains hard complex nanoscale borocarbide precipitates. After complete devitrification, a unique ductile matrix is formed consisting of α-Fe and γ-Fe phases with high volume fractions of extremely hard complex M₂(BC)₁ borocarbide phases. When compared to existing competing TWAS wires, SHS 9172 microstructures formed in as-sprayed or fully devitrified states provide superior resistance to abrasive wear and fine particle erosion.

Damage Tolerance
SHS 9172 coatings feature superior toughness and resiliency. Impact testing on the coatings were performed using a Gardner Impact testing machine. As-sprayed SHS 9172 coatings withstood impacts of 120, 240, 360 and 480 in-lbs without cracking, chipping or delaminating, while demonstrating the ability to deform with the substrate.

Spray Parameters
For SHS 9172 TWAS spray parameters, contact NanoSteel at 1-877-293-NANO or info@nanosteelco.com.