The introduction of tungsten molybdenum alloys
The manufacturing method of tungsten molybdenum alloys:
The production methods of W-Mo alloy billets have three kinds of powder metallurgy, vacuum arc melting method and vacuum electron bombardment melting method. The powder metallurgy method is most widely used, because this method is simple and can obtain the thin grain alloy billets in favor of plastic processing. The main process of powder metallurgy: molybdenum powder and tungsten powder have a mechanical mixing according to the proportion; pressed into the blank by mechanical press or isostatic press; and then the alloy billets can be sintered in high temperature sintering furnace with hydrogen. The sintering temperature is increased along with the increasing of tungsten content , and the range of sintering temperature is from 2150 ℃to 2300 ℃. Finally, the sintering billets will become the useful materials by rolling or forging.
The application of tungsten molybdenum alloys:
Tungsten molybdenum alloys can be used in higher temperature than molybdenum or molybdenum alloy. For instance, in the production of high melting furnace Porche refractory ceramic fiber in tungsten alloy as electrode, and the thimble mouth parts, its service life is much longer than the pure molybdenum products. Mo-30W has the anti erosion performance of liquid zinc is higher than the pure molybdenum, which is mostly used for certain corrosion resistant parts of liquid zinc temperature tube, zinc pump rotor and zinc smelting furnace. Due to tungsten molybdenum alloys has high melting point, good flame erosion resistance and solid particles resistance, which can be also used for solid rocket motor and rudder plate etc. The nominal composition of tungsten molybdenum alloys commonly used as a 30W, a Mo: Mo 50W and Mo 85W. Therefore, tungsten molybdenum alloys can be widely used in the big temperature range of tungsten and molybdenum.
The production methods of W-Mo alloy billets have three kinds of powder metallurgy, vacuum arc melting method and vacuum electron bombardment melting method. The powder metallurgy method is most widely used, because this method is simple and can obtain the thin grain alloy billets in favor of plastic processing. The main process of powder metallurgy: molybdenum powder and tungsten powder have a mechanical mixing according to the proportion; pressed into the blank by mechanical press or isostatic press; and then the alloy billets can be sintered in high temperature sintering furnace with hydrogen. The sintering temperature is increased along with the increasing of tungsten content , and the range of sintering temperature is from 2150 ℃to 2300 ℃. Finally, the sintering billets will become the useful materials by rolling or forging.
The application of tungsten molybdenum alloys:
Tungsten molybdenum alloys can be used in higher temperature than molybdenum or molybdenum alloy. For instance, in the production of high melting furnace Porche refractory ceramic fiber in tungsten alloy as electrode, and the thimble mouth parts, its service life is much longer than the pure molybdenum products. Mo-30W has the anti erosion performance of liquid zinc is higher than the pure molybdenum, which is mostly used for certain corrosion resistant parts of liquid zinc temperature tube, zinc pump rotor and zinc smelting furnace. Due to tungsten molybdenum alloys has high melting point, good flame erosion resistance and solid particles resistance, which can be also used for solid rocket motor and rudder plate etc. The nominal composition of tungsten molybdenum alloys commonly used as a 30W, a Mo: Mo 50W and Mo 85W. Therefore, tungsten molybdenum alloys can be widely used in the big temperature range of tungsten and molybdenum.
