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Mosten Alloy Co., Ltd.

Molybdenum-tungsten alloy

  • Mosten
  • 10 Jul

Mo-based alloys containing 25% and 30% tungsten have excellent properties to prevent corrosion of molten zinc. They can be used to fabricate molten zinc pumps and electrolytic zinc electrodes and filter molten zinc. The temperature characteristic properties (1) the melting point of Mo-W alloy increases with the increase of tungsten content. When the tungsten content increases to 25%, the melting point of Mo-W alloy is about 200 ℃ higher than that of pure Mo. Therefore, according to the temperature and melting point of the alloy, the corresponding alloy composition can be selected in the range of 2620 ≤ 3410 ℃. This advantage is also one of the advantages of Mo-W alloy. The lattice constant and density of Mo-W alloy increase linearly with the increase of tungsten content. The hardness and strength of Mo-W alloy basically increase with the increase of tungsten content, and the maximum room temperature hardness of Mo-W alloy is between 90% and 100% of tungsten content, and the Vickers hardness of Mo-W alloy is as high as 3530 ≤ 3860 MPA, which is more than twice as high as that of pure Mo. The maximum high temperature hardness of the alloy is between 70% and 85% of tungsten content. When the tungsten content increases from O to 40%, the room temperature tensile strength of the processed Mo-W alloy increases from 617MPa to 900 MPA. The hardness values of vacuum arc melting Mo-W alloy ingots are listed in the table. Strengthening mechanism of vacuum arc melting Mo-W alloy ingot the strengthening effect of binary Mo-W alloy is mainly solid solution strengthening and strain strengthening. When titanium, zirconium, niobium, carbon and other alloy elements are added to the alloy, the precipitation strengthening effect is obvious. The common nominal components of Mo-W alloys are Mo-20W,Mo-30W,Mo-50W,Mo-75W,Mo-90W and Mo-25W-0.1Zr-0.03C,Mo-25W-1.67Nb-10.37Ti-0.12ZI-0.18C. The preparation methods of Mo-W alloy ingot are powder metallurgy, vacuum arc melting and vacuum electron bombardment melting. Powder metallurgy is the most widely used method, because this method is simple and can obtain alloy ingots with fine grains, which is beneficial to plastic processing. The main processes of powder metallurgy method are as follows: the Mo powder and tungsten powder are mechanically mixed according to the proportion; the billet is made by mechanical press or isostatic press; and then the alloy ingot is sintered in the high temperature sintering furnace with hydrogen. The sintering temperature increases with the increase of tungsten content, and the range is between 2150 ℃ and 2300 ℃. Finally, the sintered ingot is rolled or forged.

Tags :
tungsten