Tungsten Carbide Fiber Cutter — Laser Cladding

Tungsten carbide fiber cutter has been widely used in textile and chemical fiber industry because of its excellent properties. But the cutter will be easily wore in a long time of cutting fiber process. So usually high-performance solid carbide sintering or overall high-speed steel required by carburizing, nitriding, carbon-nitriding and other chemical treatment methods to be prepared. The complicated process and higher cost are the main factors of impeding the developments of tungsten carbide fiber cutter. After many studies and experiments, the relevant researchers developed a new kind of surface treatment with a broad prospect — laser cladding. It takes tungsten carbide materials as high-performance cladding layer and forms a strong metallurgical bond with the base materials. Laser cladding process is essentially a rapid heating and rapid cooling and solidification of the melt process, deviation from the equilibrium state, the cladding structure refinement, hardness, strength and wear and corrosion resistance and other aspects of the process significantly better than other methods.

The researchers try to introduce laser cladding process into the manufacturing process of tungsten carbide fiber cutter. It laser cladding tungsten carbide layer in the edge portion of the cutter, which not only organically combines the excellent toughness and manufacturability of the metal base with the excellent wear, corrosion resistance and chemical stability, but also effectively improves the hardness and wear resistance of the edge of fiber cutter and extends the service life, reduces the production costs. In the process of cladding, first sample in an oven at 200 ℃ drying 4h, the selection of the bath as nitrogen protective gas laser beam synchronized blowing protection. After cladding with a prepared solution complete with pre-grinding and polishing good corrosion samples, metallurgical microstructure observed. In addition, mainly due to the generation of holes WC carbide laser cladding layer is WC dissolution and decomposition of the generation of holes provide a carbon source. At the same time, Co very prone to oxidation, causing intense gasification reaction, and the gas formed too late to escape will result in the appearance of pores. And adding an appropriate amount of Al powder can effectively inhibit the generation of holes, or TiC powder can be added to improve the hardness of cladding layer to meet the requirements of tungsten carbide fiber cutter properties.

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