Titanium carbide-based hard alloy taking nickel-molybdenum alloy as adhesive and preparation method thereof
A nickel-molybdenum alloy and cemented carbide technology, which is applied in the field of titanium carbide-based cemented carbide and its preparation, can solve the problems of reducing the bending strength of the alloy, the thickness of the annular phase, and the poor toughness of the cemented carbide, so as to improve the wettability. , The effect of improving strength and low porosity
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[0023] Example 1:
[0024] In this embodiment, the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is composed of 20% nickel powder, 10% molybdenum powder, and 70% titanium carbide powder.
[0025] In this embodiment, the method for preparing a titanium carbide-based cemented carbide with a nickel-molybdenum alloy as a binder is operated as follows:
[0026] a. Add nickel powder, molybdenum powder and titanium carbide powder into a planetary ball mill. The speed of the ball mill is 240r / min. The ball milling balls are WC-8wt% Co cemented carbide ball milling balls with a diameter of 5mm and 10mm. The ball-to-battery ratio is 6: 1. The ball milling time is 48h, the solvent used in the wet milling is absolute ethanol, and the mixed slurry is obtained by wet milling to a powder particle size of 1-1.5μm;
[0027] b. After filtering and drying the mixed slurry, add 2% paraffin wax of the total mass of the raw materials, mix well and vacuum dry at 100-150°...
Example Embodiment
[0030] Example 2:
[0031] In this embodiment, the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is composed of 13% nickel powder, 7% molybdenum powder, and 80% titanium carbide powder according to mass percentage.
[0032] In this embodiment, the preparation method of the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is the same as that of embodiment 1, except that the vacuum degree during sintering in step b is 3×10 -2 Pa.
[0033] The TiC-based cemented carbide prepared according to the above composition and process has a uniform structure, with a grain size of 0.8-1.0μm, a bending strength of 1387.2MPa, and a hardness of 92.1HRA. The X-ray diffraction pattern is shown in figure 2 , See the microscopic appearance Figure 4 . The cemented carbide of this composition can be used for continuous cutting and finishing of low carbon steel, and can also be used as the matrix of diamond-coated cemented carbide.
Example Embodiment
[0034] Example 3:
[0035] In this embodiment, the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is composed of 17% nickel powder, 8% molybdenum powder and 75% titanium carbide powder according to mass percentage.
[0036] In this embodiment, the preparation method of the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is the same as that of embodiment 1, except that the vacuum degree during sintering in step b is 5×10 -2 Pa.
[0037] The TiC-based cemented carbide prepared according to the above composition and process has a uniform structure, with a grain size of 0.8-1.0μm, a bending strength of 1467.3MPa, and a hardness of 92.0HRA. The X-ray diffraction pattern is shown in image 3 , See the microscopic appearance Image 6 . The cemented carbide of this composition can be used for continuous cutting and finishing of low carbon steel, and can also be used as the matrix of diamond-coated cemented carbide.
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