CN101392346A

CN101392346A - Method for producing special type tungsten electrode

Info

Publication number: CN101392346A
Application number: CNA2007101519059A
Authority: CN
Inventors: 祝朝晖
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-20
Filing date: 2007-09-20
Publication date: 2009-03-25

Abstract

The invention aims at improving the brittleness of a pure tungsten electrode so as to resolve the problem that the pure tungsten electrode is easy to emerge brittle failure during the welding process. According to that copper and tungsten have good wettability in a certain atmosphere, the method that 0.5 wt percent to 5 wt percent of copper is added into tungsten briquette with communication holes after the sintering at the high temperature of 1,500 DEG C to 3,000 DEG C is adopted, thus greatly improving the obdurability of the electrode. Such an electrode emerges plastic deformation in an impact test, which is obviously different from brittle failure of the pure tungsten electrode, and has good welding property.

Description

The manufacture method of special type tungsten electrode

As resistance welding, electrode materials is very crucial, and it should withstand ablation in welding process, avoid again and the welding material seam.So the requirement of counter electrode material is also very high, withstand high temperature ablation, at first just requires very high fusing point, the fusing point of tungsten is the highest (reaching 3400 ℃) in metallic substance, and its electrical property is also fine, thus tungsten also just usually selected be electrode materials.

In welding process, electrode will be pressed on the welding material, and certain pressure is arranged, so electrode materials must have certain obdurability.But tungsten has a very big shortcoming, i.e. cold-shortness, and this just makes it often rupture in actual use, and influence is produced normally.Even adopt the tungsten of strengthening through the press working after strain also can produce brittle failure,, do not change its cold-shortness though, intensity is greatly improved because it is strengthened through distortion.

Adopt to add the alloying element that can form Solid solution, can improve the obdurability of tungsten, but may damage its electrical property, influence welding quality with tungsten.Because being these alloying elements, its principle adds the bonding phase of back formation, and it with the crystal boundary of tungsten particle near form sosoloid, make and bondingly closely link together with tungsten particle, thereby obdurability is greatly improved, but the crystal boundary that was communicated with in the past is by the higher bonding blocking-up mutually of resistivity.

The objective of the invention is in order to find a kind of method, it can improve the obdurability of tungsten, does not influence welding property again.The present invention has selected copper for use, and copper can only form so-called pseudoalloy because of not forming sosoloid with tungsten between them, seldom is used for improving the obdurability of tungsten at ordinary times.But consider that it can become very good with the wetting property of tungsten in certain atmosphere, copper liquid even can be tiled in the surface of tungsten in hydrogen, this good wetting property makes copper and tungsten can produce effective complex effect, mould hard complementation, thereby can improve the obdurability of electrode materials, and the adding of copper can not damage its electrical property, because copper has the favorable conductive rate.

Concrete technology of the present invention is: is granularity that the tungsten powder of 1-10 μ m is sneaked into forming agent, compression moulding, and knot in advance in 1000-1200 ℃ of hydrogen sinters the tungsten base that contains communicating aperture into then in 1500 ℃-3000 ℃ vertical sintering furnace or induction furnace.Copper is placed on the tungsten base again, be heated to 1100-1600 ℃, at this moment liquid copper will spread all over whole tungsten base under the effect of capillary force, and the add-on of copper is controlled between the 5-15% (wt).Experimental results show that the atmosphere of oozing copper is very crucial, because if in vacuum, the wetting property of copper and tungsten is not fine, and the infiltration angle is bigger, and copper and tungsten can not well be combined with each other, sometimes even can not infiltrate the tungsten base.But in hydrogen, nitrogen or their mixed gas, the wetting property of copper and tungsten is very good, and Suo Yi Seepage copper needs to carry out in hydrogen, nitrogen or their mixed gas.

The electrode materials that the present invention makes, its obdurability is greatly improved, and impact experiment at room temperature proves that this material can produce certain viscous deformation, when sharp corner knocks, can produce the mushroom viscous deformation, the fragility that obviously is different from pure tungsten material generation when impacting is burst apart.

The electrode of manufacturing of the present invention has obtained successful application in actual production.

The welding of tungsten and copper in addition, also can utilize above mentioned in certain atmosphere copper with tungsten good wetting property is arranged, through the welding of 1100-1600 ℃ of realization tungsten and copper.With the weldment that this weldprocedure obtains, copper and tungsten welding strength are very high, and in destructive test, fracture is on the copper matrix, and face of weld is excellent.If tungsten and copper weld with electron beam, ionic fluid, cost can be very high, and technology is also complicated.Utilize the tungsten and the brazing electrode of this technology manufacturing also in actual production, to obtain successful application.

Embodiment: granularity is the tungsten powder compression moulding of 1-10 μ m, pre-knot back sintering in 2000 ℃ vertical sintering furnace, the copper of infiltration 10% in 1300 ℃ hydrogen then, the electrode materials that makes, obdurability is greatly improved, and when making impact experiment, material can produce certain viscous deformation.

Claims

1. the manufacture method of special type tungsten electrode, it is characterized in that: behind 1500-3000 ℃ of high temperature sintering, have in the tungsten base of communicating aperture, infiltrate the copper of 5-15% (wt), utilize copper and tungsten that good wetting property is arranged, make it and can produce effective complex effect by tungsten, can greatly improve the obdurability of electrode.

2. according to claim 1, it is characterized in that: when high temperature oozes copper, should in hydrogen, nitrogen or their mixed atmosphere, carry out.

3. according to claim 1, it is characterized in that: have the tungsten base of communicating aperture in 1500-3000 ℃ of high temperature, to make at vertical sintering furnace or induction furnace.

4. in nitrogen, copper and tungsten can weld together under 1100-1600 ℃ of high temperature well.