Negative electrode material for high intensity discharge lamp and manufacturing method thereof
A high-intensity discharge lamp and cathode material technology, applied in the field of metal material manufacturing, can solve the problems of serious discharge arc, reduce the life of the discharge lamp, complicated steps, etc., achieve slow grain growth, maintain shape stability, increase The effect of service life
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Embodiment 1
[0025] The manufacturing process of a discharge lamp cathode with a specification of Ф15mm is as follows
[0026] (1) Doping: Thorium nitrate, potassium aluminum silicon and blue tungsten powder are mixed and dried in the doping pot, and then enter the reduction furnace;
[0027] (2) Reduction: The reduction furnace adopts a 5-stage temperature-controlled reduction process. The temperatures of the five stages are 550°C, 650°C, 750°C, 850°C, and 950°C, and the holding time of each stage is 60-80min. 300-350g / boat, the reducing atmosphere is hydrogen, and the hydrogen flow is 3-5m 3 / h, reduction to obtain thoriated tungsten powder containing trace potassium elements, and the powder particle size is controlled at 1.5-1.9 μm;
[0028] (4) High-energy ball milling: put the reduced thorium-doped tungsten powder into a ball mill tank containing a polyurethane lining for high-energy ball milling for 3-5 hours, the ball milling medium is tungsten balls, and the ball-to-material ratio...
Embodiment 2
[0034] The manufacturing process of the cathode of a discharge lamp with a specification of Ф25mm is as follows:
[0035] (1) Doping: Thorium nitrate, potassium aluminum silicon and blue tungsten powder are mixed and dried in the doping pot, and then enter the reduction furnace;
[0036] (2) Reduction: The reduction furnace adopts a 5-stage temperature-controlled reduction process. The temperatures of the five stages are 550, 650, 750, 850, and 950°C respectively. The holding time of each stage is 60-80min, and the loading capacity is 300-350g / boat, the reducing atmosphere is hydrogen, and the hydrogen flow is 3-5m 3 / h, reduction to obtain thoriated tungsten powder containing trace potassium elements, and the powder particle size is controlled at 1.5-1.9 μm;
[0037] (4) High-energy ball milling: Put the reduced doped thorium-tungsten powder into a ball-milling tank with a polyurethane lining for high-energy ball milling for 3-5 hours.
[0038] (5) Pressing: isostatic pres...
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