How is tungsten carbide coating applied?

Tungsten carbide coatings applied with high-velocity Oxygen Fuel (HVOF) involve a high kinetic energy being sent into the powder particles as a thermal spray. These particles are highly energetic but when they hit the substrate, the velocity goes to zero and the kinetic energy is absorbed.

What is HVOF tungsten carbide coating?

HVOF tungsten carbide coating is an industrial coating process that uses combustive thermal spray at high velocity to develop exceptional wear and corrosion resistance. The process is commonly referred to as High-Velocity Oxygen Fuel spraying (HVOF).

Why is tungsten coated?

The resulting tungsten carbide coating excels at protecting various tools and equipment from wear and abrasion. The coating has a very high bond strength and will strongly adhere to many different materials.

What does tungsten carbide react with?

Insoluble in water. TUNGSTEN CARBIDE reacts violently with F2, ClF3, IF5, PbO2, NO2 and N2O (oxidants). It is readily attacked by a nitric acid-hydrofluoric acid mixture.

How do you remove tungsten carbide coating?

STRIPPING OF CHROME & TUNGSTEN CARBIDES Kolene® molten salts can quickly and completely remove unwanted carbide coatings – without base metal attack. A simple immersion process, followed by water rinsing, results in a surface ready for recoating.

How do I make Chrome carbide?

Synthesis of chromium carbide can be achieved through mechanical alloying. In this type of process metallic chromium and pure carbon in the form of graphite are loaded into a ball mill and ground into a fine powder.

What is the Rockwell hardness of tungsten carbide?

The actual hardness of individual carbide particles depends on their chemical composition. Chromium carbides are about 65/70 HRC, molybdenum and tungsten carbides are about 75 HRC, and vanadium carbides are 80/85 HRC.

Which is better stainless steel or tungsten carbide?

It has the strongest lifetime. It is 10 times harder as compared to 18 K gold and 4 times harder than titanium. It is slightly expensive as compared to stainless steel but affordable. The durability of the tungsten ring makes it worth your money.

Is tungsten carbide toxic to humans?

* Tungsten Carbide can affect you when breathed in. * Contact can cause severe skin burns. * Exposure to Tungsten Carbide combined with Cobalt or Nickel can cause a lung allergy with wheezing, coughing and shortness of breath. Repeated exposure may cause scarring of the lungs (pulmonary fibrosis).

How do you remove HVOF coating?

Whilst HVOF process gives excellent coating due to the very high adhesion and dense structure it is very difficult to remove. The current methods to remove HVOF coating are chemical stripping or mechanical grinding.

What is tungsten carbide made of?

Tungsten carbide is a dense, metallike substance, light gray with a bluish tinge, that decomposes, rather than melts, at 2,600° C (4,700° F). It is prepared by heating powdered tungsten with carbon black in the presence of hydrogen at 1,400°–1,600° C (2,550°–2,900° F).

Is carbide harder than diamond?

Among natural minerals, diamond is only harder than cemented carbide, and those in artificial minerals harder than cemented carbide are very few like silicon carbide and boron carbide. Therefore, cemented carbide is not the hardest material.

What are the applications of tungsten carbide?

Tungsten Carbide Applications. Around 17% of the metal is used to develop specialized alloys as well as composite materials containing other metals.

What is carbide coating?

Carbide Coatings. Carbide coating is a process by which a thin layer of tungsten carbide is applied to the surface of steel.

What is the Rockwell hardness of tungsten?

Tungsten Carbide has a high melting point, 2,870 °C (5,200 °F), is also extremely hard ( Vickers hardness number = 2242) and has a low electrical resistivity (~2×10−7 Ohm•m), compared to other metals (e.g. vanadium 2×10−7 Ohm•m). Rockwell Hardness.