about thermal spray powder

When we talk about the cemented carbide alloy knowledge. Thermal Spray We will think that the Thermal spraying is an industrial coating process we normally see. It consists of a heat source (flame or other) and a coating material in a powder or wire form which is literally melted into tiny droplets and sprayed onto surfaces at high velocity. This “spray welding” process is also known by many names including Plasma Spray, HVOF, Arc Spray, Flame Spray, and Metalizing.

 Thermal sprayed coatings are typically applied to metal substrates, but can also be applied to some plastic substrates. Thermal sprayed coatings uniquely enhance and improve the performance of the component. You can visit http://www.wococarbide.net/ to see more product examples. 

Now we will talk about what made the thermal spray can bear the high temperature, why this material can be used in corrosive environment? 

We know carbon is a very common chemical element in the nature environment. The different structure and constitute can determine its hardness, heat conductivity and other behaviors. For instance: the graphite is one of the softness substances, it is also a excellent electrical conductor. But thermal insulator. If we made a material can use the carbon element nature, change the quantity and structure of it. We will made a new substance that can used for us. That is call alloy. Which can help us can fight the disadvantage of the nature. 

Now let’s go further, to continue our topic. 

In our production. We normally use a alloy called Cr3C2. It contains five chemical element: They were Carbon, Cobalt, Chrome, Nickle, and Fe. These different component mixed together by different ratio can made different grade product for welding work.

There is a list made a company called Chengdu Woco Carbide Industry CO.,ltd.

Grade and chemical compositions

Main composition grade Chemical compsitions(%)
C Co Cr Ni Fe O
Cr3C2/Ni/Cr JP25NC 8.5~11.0 / 62.2-70.9 19.0~21.0 <0.5 <0.5
  JP20NC 9.5~11.0 / 73.8~75.6 15.0~17.0 <0.5 <0.5
  JP10NC 11.0~13.0 / 83.0~85.1 7.0~9.0 <0.5 <0.5

 Main grades, particle size and physical properties:

Main composition Grade Particle size Physical properties
Manufacture  Particle shape Hall flow rates s/50g Apparent desity g/cm3
Cr3C2/Ni/Cr JP25NC –45/+15μm -325+800Mesh    Agglomeration sinter    spherical <40 >2.3
JP25NC-1 –53/+15μm -270+800 Mesh <40 >2.3
JP25NC-2 –38/+15μm -400+800 Mesh <40 >2.3
JP20NC –45/+15μm -325+800 Mesh <40 >2.3
JP10NC –45/+15μm -325+800 Mesh <40 >2.3

 So we can get a conclusion:Thermal Spray is versatile and is an effective alternative and Thermal sprayed coatings can be an effective alternative to several surface treatments including: nickel and chrome plating, nitride or heat treat processes, anodizing, and weld overlay. Their” thickness depending on the coating material.

Thermal sprayed coatings offer more versatility

Versatility in SUBSTRATE choice:

Substrates can be most metals including: aluminum, steel, stainless steel, copper and bronze

Some plastics

Versatility in COATING material choice:

tungsten carbides

stainless steels

ceramics, (chrome oxide, aluminum oxide, zirconia, titania)

nickel- chrome carbides

pure metals (aluminum, zinc, copper)

This broad choice of materials give you design flexibility to solve specific performance problems.

Related links:

https://thermalspraypowder.wordpress.com/2015/04/13/how-to-choose-tungsten-carbide-round-saw-blade/

http://www.wococarbide.net/news/effects-of-ball-milling-time-on-the-microstructures-and-properties-of-tungsten-carbide.html

 

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