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Spray coating processing SPRAY PROCESSING
Introduction to the Plasma-Sprayed Ceramic Coating Process
A plasma flame jet is generated using a plasma torch (also known as a plasma arc generator). The tungsten electrode (cathode) and the nozzle (anode) of the torch are connected to the negative and positive terminals of the power supply, respectively (the workpiece remains electrically neutral). A high-frequency spark ignites an arc, causing the working gas supplied to the torch—either Ar or N2—to become ionized into a plasma under the influence of the arc.
Product Description
Plasma Spraying Ceramic Coating Process
Principle of plasma spraying:
A plasma flame jet is generated by a plasma torch (also known as a plasma arc generator). The tungsten electrode (cathode) and the nozzle (anode) of the torch are connected to the negative and positive terminals of the power supply, respectively (the workpiece remains electrically neutral). A high-frequency spark ignites an arc, causing the working gas supplied to the torch—either Ar or N2—to become ionized into a plasma under the influence of the arc. Under the combined effects of mechanical compression, self-magnetic compression, and thermal compression, the arc is compressed, forming a non-transferred plasma arc. Powder feed streams deliver the powder coating material into the plasma arc, where it is rapidly heated to a molten or semi-molten state. The molten powder is then propelled at high velocity by the plasma jet and violently impacts the pre-treated substrate surface, forming a strong and durable coating on the substrate. As a result, the coated surface of the part acquires various specialized physicochemical properties, such as hardness, wear resistance, heat resistance, corrosion resistance, insulation, thermal insulation, and lubricity, thereby meeting the diverse performance requirements of the part under different operating conditions.
Plasma spraying process:
Plasma spraying is a meticulous process, and numerous factors can significantly influence the quality of the coating during this procedure. The main steps are:
1. Select the plasma gas. From the perspective of gas availability and cost-effectiveness, N2 is a suitable choice. Not only is it inexpensive, but its ionized flame also has a relatively high heat output and conducts heat fairly quickly. However, for certain materials that are prone to nitriding reactions, N2 is not an appropriate choice; in such cases, a slightly more expensive gas—Ar—is used instead.
2. Arc power. During the process, the arc power requirement is also very strict—neither too high nor too low. If the arc power is too high, the arc temperature will rise and the gas will be ionized into a plasma; as a result, the plasma flame temperature will also increase, potentially leading to changes in the properties of the coating. On the other hand, if the arc power is too low, the plasma temperature will drop too much, which can also alter the properties of the coating.
Materials - Equipment - Processes - Solutions
We have accumulated extensive experience in coating applications, and we are now replicating these successful case studies. We’ll guide you through the entire coating manufacturing transformation process, ensuring: rapid production start-up; a reliable supply solution that covers everything—from materials and equipment to processes; coating trials conducted either at your site or at our technology center; and consistently high-quality coatings with unmatched efficiency. Start collaborating with us today and reap success tomorrow!
Prev: Tungsten carbide spray coating for mixing equipment dispersing discs
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Spraying equipment SPRAY EQUIPMENT
Introduction to the Plasma-Sprayed Ceramic Coating Process
A plasma flame jet is generated using a plasma torch (also known as a plasma arc generator). The tungsten electrode (cathode) and the nozzle (anode) of the torch are connected to the negative and positive terminals of the power supply, respectively (the workpiece remains electrically neutral). A high-frequency spark ignites an arc, causing the working gas supplied to the torch—either Ar or N2—to become ionized into a plasma under the influence of the arc.
Product Description
Plasma Spraying Ceramic Coating Process
Principle of plasma spraying:
A plasma flame jet is generated by a plasma torch (also known as a plasma arc generator). The tungsten electrode (cathode) and the nozzle (anode) of the torch are connected to the negative and positive terminals of the power supply, respectively (the workpiece remains electrically neutral). A high-frequency spark ignites an arc, causing the working gas supplied to the torch—either Ar or N2—to become ionized into a plasma under the influence of the arc. Under the combined effects of mechanical compression, self-magnetic compression, and thermal compression, the arc is compressed, forming a non-transferred plasma arc. Powder feed streams deliver the powder coating material into the plasma arc, where it is rapidly heated to a molten or semi-molten state. The molten powder is then propelled at high velocity by the plasma jet and violently impacts the pre-treated substrate surface, forming a strong and durable coating on the substrate. As a result, the coated surface of the part acquires various specialized physicochemical properties, such as hardness, wear resistance, heat resistance, corrosion resistance, insulation, thermal insulation, and lubricity, thereby meeting the diverse performance requirements of the part under different operating conditions.
Plasma spraying process:
Plasma spraying is a meticulous process, and numerous factors can significantly influence the quality of the coating during this procedure. The main steps are:
1. Select the plasma gas. From the perspective of gas availability and cost-effectiveness, N2 is a suitable choice. Not only is it inexpensive, but its ionized flame also has a relatively high heat output and conducts heat fairly quickly. However, for certain materials that are prone to nitriding reactions, N2 is not an appropriate choice; in such cases, a slightly more expensive gas—Ar—is used instead.
2. Arc power. During the process, the arc power requirement is also very strict—neither too high nor too low. If the arc power is too high, the arc temperature will rise and the gas will be ionized into a plasma; as a result, the plasma flame temperature will also increase, potentially leading to changes in the properties of the coating. On the other hand, if the arc power is too low, the plasma temperature will drop too much, which can also alter the properties of the coating.
Materials - Equipment - Processes - Solutions
We have accumulated extensive experience in coating applications, and we are now replicating these successful case studies. We’ll guide you through the entire coating manufacturing transformation process, ensuring: rapid production start-up; a reliable supply solution that covers everything—from materials and equipment to processes; coating trials conducted either at your site or at our technology center; and consistently high-quality coatings with unmatched efficiency. Start collaborating with us today and reap success tomorrow!
Prev: Tungsten carbide spray coating for mixing equipment dispersing discs
Online Quotation
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