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Thorium tungsten wire used for winding microwave oven magnetron and manufacturing method of thorium tungsten wire

A manufacturing method and magnetron technology, applied in the field of metal material manufacturing, can solve the problems of low creep resistance, easy brittle fracture, fast growth rate, etc. stable effect

Active Publication Date: 2013-10-09
威海多晶钨钼科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, during the carbonization process of microwave oven magnetrons made of traditional thoriated tungsten wires, since the carbonization temperature is higher than the recrystallization temperature of thoriated tungsten wires (about 2000°C), the tungsten grains grow rapidly, resulting in The brittleness of the microwave oven increases, so that it is prone to brittle fracture during the assembly and transportation of the microwave oven magnetron, reducing the yield of the microwave oven magnetron in the production process
In addition, due to the low creep resistance of traditional thoriated tungsten wires, microwave oven magnetrons made of traditional thoriated tungsten wires will be deformed during use, reducing their service life

Method used

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  • Thorium tungsten wire used for winding microwave oven magnetron and manufacturing method of thorium tungsten wire
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  • Thorium tungsten wire used for winding microwave oven magnetron and manufacturing method of thorium tungsten wire

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Embodiment 1

[0025] A method for manufacturing a thoriated tungsten wire for winding a microwave oven magnetron, comprising the following steps:

[0026] Step 1: Doping, mix and dry thorium nitrate solution, potassium nitrate solution, aluminum silicate solution and blue tungsten powder in the doping pot, and then send it to the reduction furnace.

[0027] Step 2: Reduction. The reduction furnace adopts a 5-stage temperature-controlled reduction process. The temperatures of the 4 stages are 550°C, 750°C, 850°C, and 950°C. / boat, the reducing atmosphere is hydrogen, and the flow rate of hydrogen is 3-5m 3 / h, reducing to obtain thoriated tungsten powder containing trace potassium elements, the powder particle size range is 1.3-1.5μm,

[0028] Step 3: High-energy ball milling, put the thoriated tungsten powder into a ball mill tank with polyurethane lining for high-energy ball milling for 3-5 hours, the ball milling medium is tungsten balls, the ball-to-material ratio is 5:1,

[0029] Ste...

Embodiment 2

[0037] A method for manufacturing a thoriated tungsten wire for winding a microwave oven magnetron, comprising the following steps:

[0038] Step 1: Doping, mix and dry the thorium nitrate solution, potassium nitrate solution, aluminum silicate solution and blue tungsten powder in the doping pot, then send them to the reduction furnace.

[0039] Step 2: Reduction, use 5-stage temperature-controlled reduction process to reduce the raw materials in the furnace, the 5-stage temperature is 550°C, 650°C, 750°C, 850°C, 950°C, and the holding time of each stage is 60-80min , the loading capacity is 300-350g / boat, the reducing atmosphere is hydrogen, and the flow rate of hydrogen is 3-5m 3 / h, reducing to obtain thoriated tungsten powder containing trace potassium elements, the powder fineness range is 1.3-1.5μm,

[0040] Step 3: High-energy ball milling, put the thoriated tungsten powder obtained in step 2 into a ball mill tank with polyurethane lining for high-energy ball milling f...

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Abstract

The invention belongs to the technical field of metal material manufacturing, and particularly relates to a thorium tungsten wire used for winding a microwave oven magnetron and a manufacturing method of the thorium tungsten wire. The thorium tungsten wire is characterized by comprising 0.5-1.5% of thorium oxide, 0.0020-0.0080% of potassium and 97-98% of tungsten. Compared with the prior art, the thorium tungsten wire and the manufacturing method have the advantages that (1) according to the thorium tungsten wire, though 0.0020-0.0080% of the potassium is added, thorium oxide particles are still fine and uniform; (2) the thorium tungsten wire contains microelement potassium in content, after coils of the microwave oven magnetron wound through the thorium tungsten wire are carbonized at a high temperature, crystal grains cannot grow larger easily, organization stability is maintained, and the situation that the microwave oven magnetron cannot break due to shaking in the packaging and delivery transportation processes after being produced is guaranteed.

Description

technical field [0001] The invention relates to the technical field of metal material manufacturing, in particular to a thoriated tungsten wire for winding a microwave oven magnetron and a manufacturing method thereof. Background technique [0002] In the prior art, the magnetron used in the microwave oven is wound with thoriated tungsten wire. In order to improve the stability of magnetron emission, it is required to carbonize the magnetron wound with thoriated tungsten wire. Carbonization is to place the shaped and assembled magnetron in hydrocarbon vapor and heat it to 2200-2500°C. When hydrocarbon vapor contacts high-temperature tungsten, carbon and hydrogen are decomposed, and carbon is attached to thorium. The surface of the tungsten wire forms tungsten carbide with tungsten and diffuses into the tungsten. Since the binding force between thorium atoms and tungsten carbide is stronger than that of tungsten, tungsten carbide will reduce thorium oxide to thorium atoms ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J23/05H01J9/02C22C27/04B22F9/04
Inventor 李猛进张海坡袁瑞杰
Owner 威海多晶钨钼科技有限公司
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