Solder and production method thereof

A production method and solder technology, applied in welding/cutting media/materials, welding media, welding equipment, etc., can solve the problem of affecting the stability and reliability of magnetrons, reduce the vacuum degree of vacuum tubes, and restrict the wide application of ruthenium-molybdenum solder and other problems, to achieve the effect of low saturated vapor pressure, easy access, and large fluctuations

Inactive Publication Date: 2016-01-27
GUANGDONG WITOL VACUUM ELECTRONICS MFR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, ruthenium-molybdenum or ruthenium-molybdenum-nickel solder is generally used in the magnetron industry to weld thorium-tungsten alloy wire and molybdenum support through high-frequency brazing. However, the content of ruthenium in ruthenium-molybdenum solder exceeds 40%, and ruthenium is a precious metal. , high price and large fluctuations, these unfavorable factors restrict the wide application of ruthenium molybdenum solder
On the other hand, in the process of magnetron manufacturing, production and use, the working temperature of thoriated tungsten alloy wire exceeds 1800°C, while the melting points of iron and nickel in the iron-molybdenum-nickel solder composition are both lower than 1600°C, which will inevitably lead to The slight volatilization of nickel reduces the vacuum degree of the vacuum tube, which affects the stability and reliability of the magnetron.

Method used

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Experimental program
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Effect test

Embodiment 1

[0066] According to the mass content ratio of the molybdenum powder and the boron powder being 96.5%: 3.5%, the molybdenum powder and the boron powder are weighed and poured into a ball mill jar. Add agate balls with different diameters according to the ratio of ball to material ratio of 4:1, and add absolute ethanol ball mill for 6 hours according to the ratio of solid to liquid ratio of 3:1. After the ball milling, the agate balls were taken out, and the remaining powder was dried in an oven at 60° C. for 2 hours. The dried powder is then added with a molding agent, formed into a blank by static pressure, and finally sintered in a hydrogen atmosphere sintering furnace at 1450-1500°C for 60-90 minutes to become a welding ring of a certain specification.

[0067] In this embodiment, molybdenum powder and boron powder are mixed according to a certain ratio, and a binary alloy is formed by ball milling. The melting point of the alloy is about 1950-2100°C. High, the solder produ...

Embodiment 2

[0069] According to the mass content ratio of the molybdenum powder, boron powder and carbon powder being 96.7%: 2.5%: 0.8%, the boron powder, carbon powder and molybdenum powder are weighed and poured into a ball mill jar. Add agate balls with different diameters according to the ratio of ball to material 6:1, and add absolute ethanol ball mill for 9 hours according to the ratio of solid to liquid 3:1. After the ball milling, the agate balls were taken out, and the remaining powder was dried in an oven at 60° C. for 2 hours. The dried powder is then added with a molding agent, formed into a blank by static pressure, and finally sintered in a hydrogen atmosphere sintering furnace at 1450-1500°C for 60-90 minutes to become a welding ring of a certain specification.

Embodiment 3

[0071] According to the mass content ratio of the molybdenum powder, boron powder and carbon powder being 97.5%: 2.0%: 0.5%, the boron powder, carbon powder and molybdenum powder are weighed and poured into a ball mill jar. Add agate balls with different diameters according to the ratio of ball to material 6:1, and add absolute ethanol ball mill for 9 hours according to the ratio of solid to liquid 3:1. After the ball milling, the agate balls were taken out, and the remaining powder was dried in an oven at 60° C. for 2 hours. The dried powder is then added with a molding agent, formed into a blank by static pressure, and finally sintered in a hydrogen atmosphere sintering furnace at 1450-1500°C for 60-90 minutes to become a welding ring of a certain specification.

[0072] In the above two embodiments, molybdenum powder, carbon powder and boron powder are mixed according to a certain ratio, and a ternary alloy is formed by ball milling. The melting point of the alloy is about ...

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Abstract

The invention provides solder and a production method thereof. The solder is composed of, by mass, 0.1%-5% of boron, 95%-98.8% of molybdenum and 0%-3% of carbon. According to the solder, a small amount of boron or the mixture of boron and carbon is added into high-temperature molybdenum alloy solder, so the solder is low in price and simple in manufacturing technology. Binary or ternary eutectic alloy solder is formed after the solder is subject to ball milling, so the working requirements of magnetron cathode components can be completely satisfied.

Description

technical field [0001] The present invention relates to the technical field of soldering, in particular to a solder and a production method of the solder. Background technique [0002] Magnetron is a vacuum electron tube that generates microwaves. Due to its high oscillation efficiency and high microwave output power, magnetrons are widely used as microwave sources for household microwave ovens, industrial microwave ovens, and other equipment. The cathode assembly composed of thoriated tungsten alloy wire and molybdenum support in the magnetron is the electron source that maintains the continuous oscillation of electrons, while the thoriated tungsten alloy wire emits electrons in a direct thermal manner through the molybdenum support and relies on an external power source. Both thoriated tungsten alloy wire and molybdenum are refractory metals, and the maximum working temperature of thoriated tungsten alloy wire in the magnetron exceeds 1800°C. Therefore, suitable high-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/32B23K35/40
CPCB23K35/32B23K35/40
Inventor 葛春桥
Owner GUANGDONG WITOL VACUUM ELECTRONICS MFR
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