Textile components require a well-defined surface shape, which is due to the contact with fibers in these parts must play a guiding, winding, spinning and drawing and entanglement of fibers required by the role. The special surfaces have to be designed for the required tension, but at the same time do not cause hair pulling and scuffing of the fibers, and at the same time must have sufficient abrasion resistance to meet the requirements of the spinning machine for a long period of time and stable work, especially in the textile industry, large-scale production, the requirements of this more prominent. All of the above through the thermal spray functional coating design and preparation to meet. Currently in the textile industry sets of equipment used in thousands of stress points most of the parts used in the functional coating composite parts, parts coating performance is shown in the table below.
From the table, it can be seen that the textile industry using Al2O3 + TiO2 coating range is wider, although this type of coating has good corrosion resistance. However, because AL2O3 and TiO2 and other oxides can be composed of new ceramic coating materials with different ratios, after plasma spraying with different post-processing techniques such as polishing, brushing, grinding and sanding and other processing methods, you can get different hardness and different surface state of the coating to adapt to the needs of a variety of fiber textile properties. Its characteristics are as follows.
Part of the textile parts surface coating and performance
Part name surface coating spraying process Application characteristics
Thread cutting blade Co-WC, TiC plasma, supersonic Abrasion-resistant, compared with the life of the uncoated life increased by 4-10 times
Drawing Roller Cr2O3, A12O3 + TiO2 plasma spraying Orange peel surface, fiber loosening Good performance
Curling roller Co-WC plasma, supersonic and fiber affinity, wear-resistant bite good
Twisting friction disk Cr2O3 plasma spraying friction must be twisted fibers good
High-speed textile machine groove barrel Cr2O3-based coatings, plasma spraying, low-friction surfaces, abrasion resistance
Double-twisting machine ingot cup A12O3 + TiO2 Plasma spraying Wear-resistant and friction-reducing, static conductive
Oiling rollers A12O3 + TiO2 plasma spraying Orange peel surface, wear-resistant
Measuring wheels, drums, disks A12O3 + TiO2 plasma spraying Wear-resistant and friction-reducing
Tightening rollers Cr2O3, A12O3 + TiO2 plasma spraying Wear-resistant and friction-reducing
Extrusion presses, measuring screws Screws Co-WC, TiC Plasma, Supersonic Corrosion and cavitation resistance
Wire guide rolls Cr2O3, A12O3 + TiO2 plasma spraying Wear-resistant, proper surface profile
Grooved rolls Cr2O3, A12O3 + TiO2 plasma spraying Wear-resistant, proper surface profile
1. Excellent resistance to high-speed fiber wear. Performance, high hardness and low surface energy nature of the oxide ceramic coating, determining its necessary wear resistance and friction reduction, which is not easily replaced by other materials.
2, different ceramic coating post-processing methods so that the surface has a different profile, there will be different friction. Can apply the right amount of "twist" to the fiber, so that the fiber to achieve the necessary strength and toughness.
3, the use of spraying surface countless particles of the raised spraying state (can be properly processed to eliminate sharp peaks), to provide a moderate surface roughness, and the role of the fiber fiber surface to obtain the necessary "velvet", to achieve good dyeing, a certain degree of hygroscopicity and so on.
Cr2O3 has a higher hardness value than Al2O3 and is chemically resistant. Carbonized coatings mainly provide stress-resistant properties, have a special role in the textile industry. Most of the spinning machine parts need to prepare a thin ceramic coating surface with extremely flat, fine and uniform surface. Spraying process must grasp the following three links: First, with ≤ 0.25mm fine-grained corundum surface roughing sandblasting: Second, the use of particle size range of 5-45um powder coating; Third, the coating thickness is generally 0.15-0.20mm.
These applications have been systematic, large-scale and standardized in China. Textile and chemical fiber industry ceramic coating applications account for most of the national ceramic coating market.
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