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2020-03-24 15:31:38

Mechanism of chemical wear of cemented carbide tool and its control

In the manufacturing and cutting process of cemented carbide tools, in order to protect cemented carbide tools, cutting fluid will be used. Cutting fluid can play the role of washing, cooling, lubrication and rust prevention, and reduce tool wear. However, some additives in the cutting fluid can leach cobalt from cemented carbide and oxidize tungsten carbide to leach, destroy the material structure of cutting tools and accelerate the wear of cutting tools. The chemical wear mechanism of cobalt and tungsten carbide in cemented carbide cutting tools was studied by immersion test, scanning electron microscope and energy spectrum analysis, including triethanolamine solution, sodium carbonate solution, borax solution, benzotriazole solution, triethanolamine oleate solution and triethanolamine oleate solution, benzotriazole and borax compound solution. The results show that borax solution, benzotriazole solution, triethanolamine oleate solution and triethanolamine oleate, benzotriazole and borax compound solution can inhibit the leaching of cobalt and tungsten carbide in cemented carbide. At 150 ℃, the cobalt of cemented carbide immersed in borax solution is not leached, and the leaching rate of tungsten is 2.88%. The mechanism of borax is that the system formed by carbide and borax solution has polarization reaction, which slows down the corrosion rate of tools and inhibits the leaching of cobalt and tungsten in carbide tools; at room temperature and 150 ℃, benzotriazole solution has no leaching effect on cobalt in carbide, and the leaching rate of tungsten is 1.53% at room temperature and 1.28% at 150 ℃. The mechanism of benzotriazole is that the lone pair electrons in benzotriazole can coordinate with metals to form coordination compounds which are insoluble and adsorbed on the surface of cemented carbide tools. With the increase of the formed coordination compounds, these complexes will polymerize to form a layer of precipitation film, which plays a role of tool protection; at 150 ℃, triethanolamine oleate solution does not leach cobalt from cemented carbide, and the leaching rate of tungsten is 0.39%. Mechanism of triethanolamine oleate: because triethanolamine oleate is an adsorption type inhibitor, which can separate the surface of cemented carbide from the external medium, the joint action of the polar group and non-polar group of triethanolamine oleate prevents the leaching of elements on the surface of cemented carbide blade. In order to further verify the influence of cutting fluid on the leaching of cobalt and tungsten in cemented carbide tools, the friction and grinding experiments were designed to simulate the machining state of cemented carbide tools in the metal cutting process. The experimental results are consistent with the immersion experiments. In the process of tool cutting, according to the machining requirements, select the appropriate cutting fluid, reduce tool wear, ensure the machining quality, and achieve green manufacturing. Wuxi beikete cemented carbide Co., Ltd. specializes in providing cemented carbide, bulletproof ceramic pieces, tungsten copper alloy and other services, welcome to inquire!


Langsun Carbide has all kinds of shapes and sizes of cemented carbide products including carbide rods, carbide plates, carbide rings, carbide bushings, carbide nozzles, carbide balls, valves and nonstandard carbide parts. We feel very pride that our tungsten carbide products are widely used in the following fields, Mechanical seals, oil and natural gas industry, New Energy, Military industry, Aerospace, Auto parts industry, Steel smelting, Coal mining, Chemical industry. More detail: www.microphoneconference.com