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Preparation method of Mo-Ru brazing filler metal powder

A powder preparation and mo-ru technology, which is used in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problem of uneven composition of Mo-Ru solder powder, insufficient mixing by mechanical mixing method, and large particle size of Mo-Ru powder. and other problems, to achieve the effect of improving the use process performance, good process characteristics and high uniformity

Active Publication Date: 2021-01-05
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Mo-Ru solder powder prepared by the above method has the following disadvantages: the mechanical mixing method is insufficiently mixed, resulting in uneven composition of the prepared Mo-Ru solder powder, poor melting properties, and affecting the brazing effect
The Mo-Ru powder prepared by the crushing-grinding method has a large particle size, which makes it difficult to coat precision components, and the manufacturability is not good
Although the Mo-Ru powder prepared by the chemical co-precipitation method has uniform composition and small particle size, the raw material ruthenium trichloride is expensive and cost-effective, and is not suitable for industrial mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of Mo-Ru solder powder has the following steps:

[0035] Step 1 Primary Mix

[0036] According to the composition of the Mo-43.27Ru solder that needs to prepare, take by weighing pure ruthenium powder and ammonium molybdate and place in the stainless steel ball mill jar, add the 60% stainless steel grinding ball of pure ruthenium powder and ammonium molybdate gross weight, mixing time is 12h;

[0037] Step 2 Roasting

[0038] Roasting after mixing, the roasting temperature is 350°C, and the time is 2h, so that the ammonium molybdate is completely deaminated and dehydrated to obtain ruthenium and molybdenum trioxide powder;

[0039] The above deamination and dehydration chemical reactions: 5(NH 4 ) 4 Mo 4 o 13 →20MoO 3 +10NH 3 +5H 2 O.

[0040] Step 3 Compounding

[0041] Step 2) The powder obtained is placed in a stainless steel ball mill tank, the amount of stainless steel balls added is 60% of the total powder, an alcohol medium is ad...

Embodiment 1

[0052] Embodiment 1 prepares 57%Mo-43%Ru solder powder

[0053] The solder composition is according to the above-mentioned composition, according to the atomic weights of the two elements in the molecular formula of ruthenium and ammonium molybdate, calculate the required mass respectively. According to the above-mentioned preparation method of Mo-Ru solder powder, the solder powder is prepared.

[0054] The solder powder prepared by the above method is measured by a laser particle size analyzer, and 80% of the powder particle size is ≤ 40 microns, and the maximum particle size is not more than 80 microns, and 80% of the particle powder is composed of molybdenum ruthenium compound.

[0055] The chemical composition of the brazing filler metal powder prepared above is detected by chemical analysis method, and its melting point is detected by DSC differential scanning calorimeter.

Embodiment 2

[0056] Embodiment 2 prepares 55%Mo-45%Ru solder powder

[0057] According to the above-mentioned composition, according to the atomic weights of the two elements in the molecular formula of ruthenium and ammonium molybdate, calculate the required mass respectively. According to the above-mentioned preparation method of Mo-Ru solder powder, the solder powder is prepared.

[0058] The solder powder prepared by the above method is measured by a laser particle size analyzer, and 70% of the powder has a particle size of ≤40 microns, and the maximum particle size does not exceed 100 microns, and 70% of the powder particles are composed of molybdenum-ruthenium compounds.

[0059] The chemical composition of the brazing filler metal powder prepared above is detected by chemical analysis method, and its melting point is detected by DSC differential scanning calorimeter.

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Abstract

The invention relates to a preparation method of Mo-Ru brazing filler metal powder. The method is used for preparing the Mo-Ru brazing filler metal powder by roasting and reducing pure ruthenium powder and ammonium molybdate, and the Mo-Ru brazing filler metal powder is uniform in component, small in particle size (the particle size range is 10-100 microns, and the grain size of 90% of brazing filler metal powder particles is less than or equal to 40 microns), high in apparent density, good in melting characteristic, excellent in process characteristic, high in cost performance, and suitable for industrial mass production.

Description

technical field [0001] The invention relates to a method for preparing materials, in particular to a method for preparing Mo-Ru solder powder. Background technique [0002] The melting point of molybdenum-ruthenium alloy brazing material is generally as high as 1900 ° C, and it has small high-temperature penetration and diffusion to high-melting point alloy base materials such as tungsten, molybdenum, and rhenium, and has good wettability and spreadability. Weld seams for firm bonding. A high-temperature Mo-Ru solder widely used in the field of electric vacuum device manufacturing, the composition is located at the eutectic point Mo-43.27Ru, the melting point is 1920 ~ 1980 ° C, because the solder is in the eutectic point composition, at the corresponding fixed brazing temperature The lower solder powder is all melted into liquid phase, melted by eutectic reaction, and then the welding to the base metal is completed. [0003] The Mo-Ru alloy with this component has a high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F9/04B22F1/00B23K35/32
CPCB22F1/0003B22F9/22B22F9/04B23K35/32B22F2009/043
Inventor 韩校宇王小宇刘奇薄新维姚志远王焱辉何浩然陈喜刘晓芸
Owner CHONGQING MATERIALS RES INST
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