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With the rapid advancement of modern technology, the demand for high-performance components in military equipment, industrial machinery, and scientific instruments has significantly increased. Traditional manufacturing methods such as casting, forging, and welding often struggle to meet these requirements, especially when it comes to complex or specialized applications. In such cases, thermal spraying has emerged as a promising alternative.
Thermal spraying is a surface engineering technique that involves heating a coating material—such as metal, ceramic, or polymer—to a molten or semi-molten state using a heat source, then accelerating it onto a prepared substrate at high velocity. This process forms a durable and functional coating that can enhance wear resistance, corrosion resistance, thermal insulation, and more. It's widely used across industries like aerospace, automotive, power generation, and medical devices.
While most thermal spray applications focus on protective or functional coatings on external surfaces, there are growing efforts to apply this technology directly to produce parts. One such example is the production of sliding bearings, which traditionally rely on casting or machining processes. However, due to limitations in current thermal spray equipment, it's challenging to coat internal surfaces with small diameters or deep cavities.
In this article, we explore a novel method for manufacturing sliding bearing linings using thermal spraying. The process involves creating a temporary tooling system that allows for precise application of the coating inside a small bore. A low-melting alloy is first applied to a mandrel, followed by a refractory coating. After spraying, the tooling is removed, leaving behind a functional bearing lining. This approach not only reduces material waste but also improves performance compared to traditional casting methods.
Several key factors must be considered during the implementation of this technique, including the selection of appropriate materials, control of coating thickness, and ensuring proper adhesion between layers. Additionally, the thermal expansion behavior of the materials and the residual stresses within the coating must be carefully managed to prevent delamination.
Although this method is still in the experimental stage and not yet suitable for mass production, it offers exciting possibilities for creating customized, high-performance components with specific functional requirements. Future developments may expand its use in various industries where precision and durability are critical.
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This article is sourced from China Bearing Network.
Please visit http://www.chinabearing.net for more information.
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Source: China Bearing Network | Time: 2013-07-23