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The company has introduced spray coatings produced using advanced equipment and technology from the U.S. company TAFA:
One 、SX-801 Ultra-hard, wear-resistant spray wire
* Typical applications: To address the wear problem in circulating fluidized bed (CFB) boilers, based on the wear mechanisms of CFB boilers, the coating material must possess high wear resistance, good ductility, and a certain level of corrosion resistance. Our company... Introducing advanced equipment and technology from the U.S. company TAFA. We have developed an ultra-high-hardness tubular spray wire material, SX-801, made from nanometer-sized powders. This material fully leverages the unique properties of nanomaterials to achieve a high-hardness, ultra-wear-resistant coating. According to tests of various experimental technical indicators, all wear-resistant performance parameters of this material meet the design requirements.
* SX-801 Main ingredients of the material:
Chromium (Cr), nickel (Ni), boron (B), Cr3C2 hard ceramics, and others.
*SX-801 Specific microstructure of the spray coating:
The mixture of Cr3C2 and its reaction products formed during the spraying process consists of hard particles that serve as the skeletal structure within the coating. NiCrB, with its excellent ductility and corrosion resistance, acts as the matrix supporting these hard particles. The hard particles are embedded in the matrix and are uniformly distributed throughout it.
*SX-801 Wear resistance:
The mixed phase consisting of Cr3C2 and its reaction products formed during the spraying process serves as hard particulate reinforcements, forming the skeletal structure of the coating and thereby withstanding impacts from erosive particles. As is well known, chromium carbides possess exceptionally high hardness, fully meeting the requirements for wear resistance.
*SX-801 Elongation at break:
Chromium carbides have relatively high hardness, but their thermal expansion coefficients differ significantly from those of the matrix. This necessitates that the substrate material possess good ductility—specifically, a thermal expansion coefficient similar to that of the matrix. As a substrate material, NiCrB, combined with an intermediate underlayer, ensures the overall coating’s ductility and prevents cracking even under conditions of continually fluctuating temperatures.
*SX-801 Corrosion resistance:
When the coating operates under conditions involving corrosive media, NiCr exhibits excellent corrosion resistance, ensuring that the hard particles will not fail or fall off due to corrosion of the substrate, thereby directly affecting the coating’s wear resistance.
*SX-801 Basic parameters of spray coatings:
Coating adhesion strength ≥ 45 MPa
Coating thickness ≥ 0.6 mm
Coating hardness ≥ HRC52
Coating porosity ≤ 1%
Effective protection period: 1 year
Thermal conductivity: 34–38 W/m·K
Coefficient of linear expansion: 12.5 × 10⁻⁶
Two 、SX-601 High-temperature and corrosion-resistant spray powder-core wire
* Typical applications: During operation, power plant boilers burn high-sulfur coal, generating large volumes of flue gas containing components such as SO2/O2 and H2S. At high temperatures, free-state sulfur atoms formed through various pathways react with the tube walls of the boiler's heated surfaces, leading to high-temperature sulfur corrosion characterized by the formation of sulfide-based compounds. FeS is the primary corrosion product. The corrosion product FeS has a porous and loose structure, offering no protective effect on the boiler tube walls. Our company and... Researchers from the U.S. company TAFA are collaborating to tackle key challenges. Using nano-agglomeration technology, we have developed an SX-801 nano-powder tubular core wire for high-temperature and corrosion-resistant spray coating.
* SX-601 Main components of the material and their functions:
The main components of the material are: nickel (Ni), chromium (Cr), and titanium.
The role of nickel (Ni) in coatings—
Nickel has a face-centered cubic structure, with a highly stable microstructure and no allotropic transformations. It exhibits excellent alloying properties, rarely forming detrimental phases when combined with other alloying elements. Moreover, its good ductility ensures that the coating has a thermal expansion coefficient nearly identical to that of boiler tubes.
The role of chromium element Cr in the coating is—
Chromium can enhance the sulfur corrosion resistance of nickel-based alloys by forming a stable, dense Cr2O3 protective layer that inhibits the diffusion of elements. At the same time, Cr2O3 exhibits excellent wear resistance, which helps suppress the sulfur (S) element in Ni₃S₂, thereby reducing the formation of the low-melting eutectic phase Ni-Ni₃S₂.
The role of titanium element Ti in coatings—
Titanium is an exothermic element that enhances the bonding strength of the coating. Meanwhile, metallic titanium forms a spinel structure with chromium and oxygen within the coating.
*SX-601 Coating performance:
Heat-resistant and high-temperature resistant, resistant to abrasive particle wear, resistant to erosion, resistant to micro-vibration wear, operating temperature <900°C
* SX-601 Basic parameters of spray coatings
Coating adhesion strength ≥ 50 MPa
Coating thickness ≥ 0.35 mm
Coating hardness ≥ HRC45
Coating porosity ≤ 1%
Effective protection period ≥ 4 years
Coefficient of thermal expansion: 12 × 10⁻⁶
Thermal conductivity: 38–45
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