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Development Prospects of Plasma Spraying
Release time:
2019-12-23 16:35
Source:
Prospects for the Development of Plasma Spraying Technology
In recent years, several new plasma spraying technologies have been developed on the basis of conventional plasma spraying, such as:
1. Vacuum plasma spraying (also known as low-pressure plasma spraying)
Vacuum plasma spraying is a coating technique performed in a sealed chamber with a controllable atmosphere at a pressure ranging from 4 to 40 kPa.
Since the working gas, after being plasmaized, expands in volume and is ejected simultaneously in a low-pressure atmosphere, the jet velocity is supersonic and particularly well-suited for materials that are highly sensitive to oxidation.
2. Water-stabilized plasma spraying
The working medium used in the plasma spraying methods mentioned earlier has always been a gas. However, this method uses water as its working medium instead of gas. It is a high-power or high-speed plasma spraying technique, and its working principle is:
A high-pressure water flow is introduced into the spray gun, creating a vortex along the inner wall of the gun barrel. At this point, a direct-current arc is generated between the cathode located at the rear of the gun body and the rotating anode positioned at the front of the gun body. This arc causes part of the inner surface of the gun barrel to vaporize and decompose, transitioning it into a plasma state and producing a continuous plasma arc. Thanks to the focusing effect of the rotating vortex flow, the energy density of the arc is significantly increased, ensuring stable combustion. As a result, it becomes possible to spray high-melting-point materials—particularly oxide ceramics—with exceptionally high efficiency.
3. Stable-gas plasma spraying
The principle of atmospheric plasma spraying is that a plasma torch (plasma arc generator) produces a plasma jet (arc flame). The torch’s electrode (cathode) and nozzle (anode) are connected to the positive and negative terminals of a rectifier power supply, respectively. A working gas (such as Ar or N2) is supplied to the torch, and an arc is ignited by means of a high-frequency spark. The arc heats the gas to an extremely high temperature, causing it to become ionized. Under the combined effects of thermal contraction, self-magnetic compression, and mechanical forces, the arc is compressed, resulting in a non-transferred plasma arc. After the high-temperature plasma gas is ejected from the nozzle, its volume expands rapidly, forming a high-temperature, high-speed plasma jet. As the powder feed gas propels the powder particles into the plasma jet, they are quickly heated to a molten or semi-molten state and accelerated within the jet, forming a spray ion beam that flies toward the pre-treated substrate surface and progressively impacts it, thereby depositing a coating. In atmospheric plasma spraying, argon, nitrogen, and hydrogen are used as plasma gases.
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Relevant Information
The complete set of plasma-sprayed equipment has been shipped to the customer’s site in Thailand.
Core spraying equipment: SX-80 plasma spray main unit, with a 15,000℃ flame suitable for multiple materials including zirconia and silicon carbide; powder feeding accuracy of ±1%, and coating thickness tolerance ≤ ±5 μm. Environmental protection support system: Customized soundproof booth + pulse dust collector—effectively addressing spray noise pollution while achieving highly efficient dust recovery, compliant with Thai environmental standards. Automated equipment: 6-axis industrial robot + intelligent spray cart, enabling precise spraying of complex workpieces and automated loading/unloading, boosting production efficiency by 40%.
On-site engineers provide hands-on training, focusing on the core operations of plasma spraying equipment such as the SX-80. Sanxin has customized a complete solution for its customers, including an automated spraying robotic arm, a soundproof booth, and a dust removal system—ensuring both high spraying efficiency and compliance with environmental standards.
Guangzhou Sanxin Thermal Spraying Turntable Shipment
Guangzhou Sanxin Company manufactures single-station and multi-station thermal spray turntables, which can be paired with plasma equipment, supersonic equipment, and arc equipment. We offer rapid, customized production tailored to customer requirements and product dimensions. A thermal spray turntable is a high-precision rotary worktable specifically designed for thermal spraying processes—including flame spraying, plasma spraying, and arc spraying. By providing controllable rotational speed and exceptional stability, it ensures uniform coating thickness on the workpiece surface, thereby enhancing spraying efficiency and quality.
SX-80 plasma equipment is being used at a customer site in Russia.
SX-80 plasma equipment is being used at a customer site in Russia.
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