Novel cathode high-temperature brazing material and preparation method thereof

A technology of brazing material and cathode, which is applied in welding equipment, welding/cutting medium/material, welding medium, etc., can solve the problem of high melting point, and achieve the effect of uniform composition, fine particles, and uniform particle size

Active Publication Date: 2014-06-18
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this system is cheap, the problem of high melting point still exists (melting point is about 2000°C)

Method used

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  • Novel cathode high-temperature brazing material and preparation method thereof
  • Novel cathode high-temperature brazing material and preparation method thereof
  • Novel cathode high-temperature brazing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Solder composition (mass fraction): 92.0%Ru-6.5%B-1.5%C

[0036] The preparation method of solder powder is as follows: weigh according to the above-mentioned solder composition ratio, Ru powder, B powder, and C powder are preferably high-purity (purity ≥ 99.9% by weight), ultrafine (particle size ≤ 50 μm) powder (the following examples The same), the three powders are burned with hydrogen to remove impurities at 800°C, the hydrogen dew point is -60°C, and the hydrogen flow rate is 70ml / min; the treated powders are mixed and granulated. Under the pressure of 280MPa, the solder preform was made by cold isostatic pressing; under the conditions of hydrogen flow rate of 80ml / min, dew point -60°C, and temperature of 420°C, the preform was kept for 1h for dewaxing treatment, and then the temperature was raised to 1100 ℃ for high-temperature sintering (the hydrogen flow rate remains unchanged); the sintered solder preform needs to be electron beam vacuum smelted to remove impu...

Embodiment 2

[0039] Solder composition (mass fraction): 94.0%Ru-3.5%Ru-2.5%C

[0040] The preparation method of the solder powder is as follows: weighing according to the above-mentioned solder composition ratio, burning hydrogen to remove impurities at 750°C for the three powders, the hydrogen dew point is -60°C, and the hydrogen flow rate is 75ml / min, and the processed powders are mixed. powder, granulation. Under the pressure of 300MPa, the solder preform is made by cold isostatic pressing; under the conditions of hydrogen flow rate of 70ml / min, dew point -60°C, and temperature of 450°C, the preform is kept for 1h for dewaxing treatment, and then the temperature is raised to High-temperature sintering at 1000°C (hydrogen flow rate increased to 100ml / min); the sintered solder preform needs to be cleaned of impurities (gas and high vapor pressure impurities, etc.) at 5×10 -3 Pa, the electron gun vacuum is better than 5×10 -4 Pa; The solder alloy ingot (Ф30mm alloy rod) obtained by elec...

Embodiment 3

[0043] Solder composition (mass fraction): 89.0%Ru-10.0%Ru-1.0%C

[0044] The preparation method of solder powder is as follows: weigh according to the above-mentioned solder composition ratio, burn hydrogen to remove impurities at 780°C for the three powders, the hydrogen dew point is -60°C, and the hydrogen flow rate is 100ml / min. Powder mixing and granulation. Under the pressure of 330MPa, the solder preform is made by cold isostatic pressing; under the conditions of hydrogen flow rate of 100ml / min, dew point -60°C, and temperature of 500°C, the preform is kept for 1h for dewaxing treatment, and then the temperature is raised to High temperature sintering at 1050°C (hydrogen flow rate remains unchanged); after sintering, the solder preform needs to be cleaned of impurities (gas and high vapor pressure impurities, etc.) 10 -3 Pa, the electron gun vacuum is better than 5×10 -4 Pa; The solder alloy ingot (Ф30mm alloy rod) obtained by electron beam smelting is powdered (coar...

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Abstract

The invention relates to a novel cathode high-temperature brazing material and a preparation method thereof, in particular to Ru-B-C alloy component brazing powder and a manufacturing method thereof. The brazing material mainly comprises Ru-B-C alloy powder, in weight percent, 89.0-97.5wt% of Ru, 2.0-10.0wt% of B and 0.5-3.0wt% of C, and the elementary substance content of the Ru, the B and the C is lower than 2wt%. The brazing material is prepared by the aid of an electron beam smelting purification-plasma rotating electrode atomization powder manufacturing-airflow grinding crushing method. Prepared brazing powder particles are fine and uniform in granularity and composition, so that the problems of high welding temperature, composition segregation, large solid-liquid phase line temperature difference, poor welding process and the like of an existing brazing material can be solved.

Description

technical field [0001] The present invention relates to a new type of cathode high temperature brazing material and its preparation method, specifically a kind of brazing material powder with Ru-B-C alloy composition and its manufacturing method, especially related to the new brazing material composition and electron beam smelting purification-plasma rotating electrode The preparation process of atomization pulverization-jet milling to produce ultra-fine Ru-B-C solder powder. Background technique [0002] Cathode is known as the heart of vacuum electronic devices. It is mainly divided into cold cathode and hot cathode. The working temperature of hot cathode is generally above 1100°C. Moreover, during the working process of the hot cathode, most of the heat of the heater is conducted to the electron emission component (W-based sponge) through the Mo support tube, so the welding between the W-based sponge of the hot cathode and the Mo support tube is the cathode key process i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30C22C5/04C22C1/04
CPCB22F1/0003B22F9/04B22F9/08B22F2301/00B22F2301/25B22F2302/00B22F2302/40B22F2302/45B22F2303/00B22F2303/01B22F2999/00B23K35/0244B23K35/40C22C1/10C22C5/04
Inventor 张小勇李锴陆艳杰李新成
Owner GRIMAT ENG INST CO LTD
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