Tungsten Carbide, Chrome Carbide, & Other Metal Spray Powders for Thermal Coatings
Our crushed tungsten carbide is screened to meet a variety of different specification and sizing requirements. The crushed tungsten is of sintered tungsten carbide with a cobalt binder sometimes used by ocyecetepelene or even heat induction for brazing applications. The brazing carbide is used to produce highly wear resistant tungsten carbide composite rod, also called tungsten carbide brazing rod.
Properties of Thermal Spray Coatings
- High Hardness
- Good Strength
- Excellent resistance to wear, abrasion and scratching
- Good corrosion resistance
- High bonding strength
- Low porosity
- Dense coating
- Offers variable properties depending on the grain size of the WC powder and its volume fraction during thermal spraying
Tungsten Carbide Powders
Thermal spray coatings of tungsten carbide are used for their hardness and wear resistance. When choosing a tungsten carbide powder, the particle size and type of carbide selected are important in determining the correct material to combat various forms of erosion, abrasion, and wear. Whereas the amount of metal matrix in the coating (Nickel, Cobalt, Alloy) will depend on the toughness an abrasion resistance required.
- HVOF
- Air plasma
- Combustion
HVOF (High Velocity Oxygen Fuel) spray uses a combination of a fuel and oxygen to produce high quality carbide coatings. The high energy output is known to produce coatings with low porosity and high bond strength. This technology is also used for temperatures between 4,000 F and 5000 F with velocities in the range of 1,500 ft/sec to 2,800 ft/sec. It’s these higher velocities that lead to greater coating thickness, lower porosity, lower oxide content, and thus better adhesion of the coating to the product.
Other Metal Spray Powders
Due to the binder-less manufacturing method of these thermal spray powders, these nickel-baed metal alloy powders produce very little residue while spraying. Metal spray powders are good for build-up and repair coatings.
Thermal Spray Coating Selection Criteria
The expense of a coating is directly dependant on the material being coated. In this regard, Tungsten Carbide coatings are a premium coating. These coatings are often preferred when parts have undergone irreversible damage by wear or erosion and coating is more cost effective than buying new. In such conditions, WC coatings are a cheaper and feasible solution.
They are primarily used where excellent wear resistance is the main requirement; as its wear resistance surpasses its other mechanical properties.
Thermal Coating
Benefits
-
Less than 1%
Porosity01 -
High resistance
to wear02 -
Hardness
Exceeding Rc7003 -
Corrosion-
resistant04 -
Bonding Strength
Average of 8,500psi05 -
Can be finished
down to 6 Ra06
Applications for Thermal Spray Coating
Thermal spraying is used in a variety of coating processes including Plasma Spraying, HVOF Spraying, Arc Spraying and Flame Combustion Spraying. These processes are also called Metalizing Spraying. Coating quality is usually assessed by its porosity, oxide content, macro and micro-hardness, bond strength and surface roughness. Generally higher particle velocity results in higher coating quality.
- Corrosion/Galvanic Protection
- Dimensional Restoration
- Electrical Insulation
- EMI/RFI Shielding
- Emissivity
- Erosion Resistant
- Galling Resistant
- Bio-Fouling
- Decorative/Cosmetic Marking
- Hard Chrome Replacement
- Low Friction Release
- Chemically Strippable
Need Powder for with Thermal Coating Applications?
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