Coating method
Currently, the main commonly used blade coating methods are chemical vapour deposition (CVD) and physical vapour deposition (PVD), as well as some emerging coating technologies such as plasma chemical vapour deposition (PCVD) and ion beam assisted deposition (IBAD).
(1) CVD (chemical vapour deposition)
Using the vapour, hydrogen and other chemical components of metal halides, decomposition, thermo-combination and other gas-solid reactions at high temperatures (950 ~ 1050 ℃) to form a solid deposition layer on the surface of the blade substrate. the CVD coating process has a higher temperature, reliable bonding, but may bring about problems such as residual tensile stresses.
(2) PVD (Physical Vapour Deposition)
Under vacuum conditions, low voltage, high current arc discharge technology is used to evaporate the target material and ionise it with the gas, which is deposited on the blade substrate using the accelerating effect of the electric field. the PVD coating has a lower temperature (300~500°C), which will not damage the hardness and dimensional accuracy of the blade substrate, and the coating has a high degree of purity and densification, and is firmly bonded to the substrate.
(3) PCVD (Plasma Chemical Vapour Deposition)
Using plasma to promote chemical reaction and reduce the coating temperature to below 600°C. It is suitable for occasions where diffusion or exchange reaction is not easy to occur between the cemented carbide substrate and the coating material.
(4) IBAD (Ion Beam Assisted Deposition Technology)
While depositing the coating in the cold phase, bombard the continuously deposited material with an ion beam of certain energy to improve the bonding strength between the coating and the substrate.
Advantages of coated blades
l Improved wear resistance: The coating material has high hardness and wear resistance, significantly extending blade life.
l Improved oxidation resistance: The coating acts as a chemical and thermal barrier, reducing diffusion and chemical reactions between the blade and the workpiece.
l Reduced friction: Coatings have a low coefficient of friction, improving the cutting process and machining quality.
l Increase metal fatigue resistance: Coated materials effectively resist fatigue crack extension.
l Increase thermal shock resistance: The coating material has good thermal stability and adapts to high temperature cutting environment.
l Prevents corrosion: Corrosion can be a serious problem, especially for steel blades, and high-quality, well-designed coatings can significantly reduce maintenance requirements and the risk of corrosion.
Extend product life: Blade coatings can improve durability, damage resistance and overall blade functionality, and the right blade coating can help extend the life of industrial cutting blades, which is essential for reducing downtime and improving efficiency.
You need to consider the following factors before choosing a blade coating
(1) Product Use
Firstly, it is important to identify where the product will be used, such as food processing, automotive, aerospace, medical devices, etc. This will have a direct impact on the choice of coating, and if you are working in the food processing industry you will need to ensure that your blade coatings are FDA compliant and non-toxic. TiCN and Teflon are excellent blade coatings that are non-toxic and FDA-compliant or approved, which allows you to use them in food processing without risking contamination of your product with harmful chemicals or materials. If your industry requires flexible blades, DLC coatings and hard chrome are an excellent choice.
(2) Make sure the blades are high quality
In addition to looking for quality from the manufacturer, you need to make sure that your knives are high quality before applying the coating. Even with a high-quality coating, a low-quality blade won't last very long, and this can affect the effectiveness of the coating. If you want to make the most of blade coatings, you need to make sure that you start with high-quality industrial knives.
(3) Performance requirements
These include hardness, abrasion resistance, corrosion resistance, high temperature resistance, adhesion resistance, etc. These performance requirements will determine the type of coating material.
(4) Cost Considerations
The cost of the coating material and coating method are also important considerations when making a selection.
Conclusion
Blade coating technology is an effective way to improve blade performance, extend blade life, improve cutting efficiency and machining accuracy. Through the selection of suitable coating materials and coating methods, coated blades with excellent comprehensive performance can be prepared to meet a variety of complex processing needs. In the future, with the continuous innovation and development of coating technology, coated blades will play a more important role in the manufacturing industry.
That's all for this article. If you need the industrial blades or have some questions about it, you can contact us directly.
Later, We will continue to update information, and you can find more information on our website (passiontool.com) blog.
Of course, you can also pay attention to our Official social media:
Post time: Oct-18-2024
