Sintering method for rear earth tungsten electrode billets
A sintering method, rare earth tungsten technology, applied in the field of powder metallurgy, can solve the problems of reduced yield, large temperature gradient of tungsten billet, high sintering cost, etc., and achieve the effect of high yield and high efficiency physical properties
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[0028] Example 1: First, La 2 O 3 The content is 1.5%, the weight after isostatic pressing is 500g, and the tungsten billet with a length of 200mm is sent into the cavity of the intermediate frequency induction furnace, and hydrogen flow is introduced into the cavity; the intermediate frequency sintering furnace is started at 100°C per hour The temperature rises at a heating rate of 1200°C, the temperature is kept for 2 hours, the temperature is continued to 2000°C, and the temperature is kept for 4 hours; the power is turned off again, and the sintered body is taken out after the temperature in the cavity reaches normal temperature.
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[0029] Example 2: First, CeO 2 The content is 2%, the weight after isostatic pressing is 1000g, and the tungsten billet with a length of 500mm is sent into the cavity of the intermediate frequency induction furnace, and hydrogen flow is introduced into the cavity; the intermediate frequency sintering furnace is started at 100°C per hour The temperature rise rate is increased to 1400°C, the temperature is kept for 2 hours, and the temperature is continued to 2400°C, and the temperature is kept for 2 hours; cut off the power supply and take out the sintered body after the temperature in the cavity reaches normal temperature.
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[0030] Example 3: First, La 2 O 3 , Y 2 O 3 , CeO 2 The total content of the three rare earth oxides is 2.2%, the weight after isostatic pressing is 1500g, and the tungsten billet with a length of 400mm is sent into the cavity of the intermediate frequency induction furnace, and hydrogen flow is introduced into the cavity; the intermediate frequency sintering furnace is started , The temperature is increased at a heating rate of 200°C per hour, the temperature is increased to 1200°C, the temperature is kept for 2 hours, the temperature is continued to 2200°C, and the temperature is kept for 3 hours; cut off the power supply, and after the temperature in the cavity reaches normal temperature, take out the sintered body.
[0031] According to the rare earth tungsten electrode blanks obtained in the above three embodiments, the following table shows the test density of the rare earth tungsten electrode blanks obtained in the above three embodiments:
[0032] Table 1
[0033]
[0034] Su...
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