Knowledge What are the coating methods on carbide inserts? 4 Key Techniques Explained
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Tech Team · Kintek Solution

Updated 2 months ago

What are the coating methods on carbide inserts? 4 Key Techniques Explained

Coating methods on carbide inserts are crucial for enhancing their performance in various cutting operations.

These methods primarily involve Chemical Vapor Deposition (CVD) and other related techniques such as Plasma-Activated CVD (PACVD).

These techniques improve the inserts' hardness, wear resistance, and durability.

What are the coating methods on carbide inserts? 4 Key Techniques Explained

What are the coating methods on carbide inserts? 4 Key Techniques Explained

1. Chemical Vapor Deposition (CVD)

CVD is a widely used coating technique for carbide inserts.

In this process, the inserts are exposed to one or more volatile precursors that react and/or decompose to form a thin film on the substrate surface.

This method is known for producing high-quality, high-performance coatings with low porosity and high wear resistance.

Common coatings applied through CVD include titanium nitride (TiN), titanium carbon nitride (TiCN), and aluminum oxide.

These materials enhance the inserts' hardness and wear resistance, improving tool life and productivity in metal cutting applications.

2. Plasma-Activated CVD (PACVD)

An alternative to traditional thermal CVD is PACVD.

PACVD uses plasma activation of precursor gases to promote the deposition of dense thin films.

This method can operate at lower temperatures (200–300 °C), which is beneficial for limiting size distortion effects on steel tools.

PACVD is particularly useful for depositing films onto a broader range of substrate materials and can enhance the adhesion of coatings like diamond-like carbon (DLC) on steel and hard metal substrates.

3. Carbon Coating Methods

Carbon coatings on carbide inserts are explored to improve surface chemical stability, structural stability, and Li-ion diffusion capabilities.

These coatings can be applied using wet chemical methods (such as hydrothermal/solvothermal, sol-gel, and chemical polymerization) or drying coating methods.

The choice of method depends on the specific requirements of the cathode material structure and the desired properties of the coating layer.

4. Tungsten Carbide Thermal Spray Coating Process

Another method involves the use of High-Velocity Oxy-Fuel (HVOF) thermal spray to apply tungsten carbide coatings.

This process involves combusting fuel gas and oxygen to create high-temperature, high-pressure gas that accelerates tungsten carbide powder to high velocities, depositing it as a coating on the inserts.

This method is known for producing coatings with high bond strength and low residual stress, enhancing the inserts' durability and resistance to wear and corrosion.

Continue exploring, consult our experts

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