CN112570714B - Preparation method of composite tungsten-copper contact tube - Google Patents

Preparation method of composite tungsten-copper contact tube Download PDF

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CN112570714B
CN112570714B CN202011406549.2A CN202011406549A CN112570714B CN 112570714 B CN112570714 B CN 112570714B CN 202011406549 A CN202011406549 A CN 202011406549A CN 112570714 B CN112570714 B CN 112570714B
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copper
tungsten
nozzle
infiltration
contact tube
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CN112570714A (en
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冯基伟
梁永仁
丁辉
王贤青
吴引江
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Xi'an Baode Jiutu New Materials Co ltd
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Xi'an Baode Jiutu New Materials Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/04—Casting by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating

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  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention discloses a preparation method of a composite tungsten-copper contact tube, which comprises the following steps: mixing tungsten powder with an alcohol solution dissolved with stearic acid, pouring the mixture into a stirrer for stirring, and drying the mixture after uniformly stirring; filling the treated tungsten powder into a rubber sleeve, and pressing the tungsten powder into a shape by using a cold isostatic press to obtain a green body; placing the green body in a hydrogen sintering furnace for skeleton molding sintering to obtain a mouth end; arranging a plurality of grooves at the bottom of the graphite boat side by side, placing the nozzle end in the grooves, and reserving a nozzle body space; spreading electrolytic copper above the mouth end for copper infiltration to enable liquid copper to infiltrate the mouth end and fill the reserved space, and obtaining an infiltration rough blank of the composite tungsten-copper conductive mouth; and processing the infiltration rough blank of the composite tungsten-copper contact tube to obtain the composite tungsten-copper contact tube. The defects of holes, solid inclusions, incomplete penetration and the like generated by a welding method are avoided, and the mechanical property of the composite tungsten-copper conductive nozzle is greatly improved.

Description

Preparation method of composite tungsten-copper contact tube
Technical Field
The invention belongs to the technical field of a contact tube preparation method, and relates to a preparation method of a composite tungsten-copper contact tube.
Background
A contact tip is typically positioned at the tail of the welding gun for guiding the welding wire. The common conductive nozzle is composed of a nozzle body and a nozzle end, wherein the nozzle body is made of common materials such as brass, aluminum, chromium-copper alloy, zirconium-chromium-copper alloy or phosphor bronze; common materials for the tip include copper, chrome copper alloy, zirconium chrome copper alloy, milled copper alloy, silver tungsten alloy, copper tungsten alloy, alumina dispersed copper, beryllium copper alloy, or nickel beryllium copper alloy. For the contact tip material, not only is it required to have excellent conductivity, but also it is required to maintain high strength, abrasion resistance and corrosion resistance at high temperatures. The common material is poor in wear resistance, so that adhesion and splashing are easy to occur in the welding process, the welding nozzle is blocked, or the welding wire and the contact nozzle are bonded. The milled copper alloy, the silver-tungsten alloy and the beryllium copper alloy are expensive and difficult to prepare, so that the application range of the milled copper alloy, the silver-tungsten alloy and the beryllium copper alloy is limited. The composite tungsten-copper contact tube has high hardness, good hot hardness, good wear resistance, strong arc ablation resistance and adhesion resistance, and becomes a contact tube material with wide application prospect.
In order to overcome the technical problem of preparing the upper and lower combined type tungsten-copper conductive nozzle, the invention patent publication No. CN107309532A discloses a preparation method of the upper and lower combined type tungsten-copper conductive nozzle, which provides that a nozzle body and a nozzle end of the conductive nozzle are respectively prepared, and then the nozzle body and the nozzle end are connected through high-temperature friction welding. It can be seen that the patent mainly connects the nozzle body and the nozzle end by high-speed friction welding, but the method has the welding defects such as holes, solid inclusions, incomplete penetration and the like, which cause incomplete fusion of a connection interface, reduction of the cross-sectional area of a welding seam, reduction of the bearing capacity, reduction of the conductivity, the heat conductivity and the strength, and influence on the service life of the contact nozzle.
Disclosure of Invention
The invention aims to provide a preparation method of a composite tungsten-copper contact nozzle, which solves the problem of defects generated at a connecting interface in the welding process of a nozzle body and a nozzle end in the prior art.
The technical scheme adopted by the invention is that the preparation method of the composite tungsten-copper contact tube comprises the following steps:
step 1, mixing tungsten powder with an alcohol solution dissolved with stearic acid, pouring the mixture into a stirrer for stirring, uniformly stirring, and drying, wherein the content of the stearic acid is 0.5-1.8 wt%;
step 2, filling the tungsten powder treated in the step 1 into a rubber sleeve, and pressing the tungsten powder into a shape by using a cold isostatic press to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton molding sintering to obtain a mouth end;
step 4, arranging a plurality of grooves at the bottom of the graphite boat side by side, wherein the length of each groove is at least the sum of the lengths of the nozzle end and the nozzle body, placing the nozzle end in the groove, and reserving a nozzle body space;
step 5, spreading electrolytic copper on the upper part of the nozzle end for copper infiltration, so that liquid copper infiltrates into the nozzle end and fills the reserved space to obtain an infiltration rough blank of the composite tungsten-copper conductive nozzle;
and 6, processing the infiltration rough blank of the composite tungsten-copper contact tube to obtain the composite tungsten-copper contact tube.
The invention is also characterized in that:
the Fisher size of the tungsten powder in the step 1 is 2-10 um.
The preparation process of the rubber sleeve in the step 2 comprises the following steps: preparing 800-1200g of polyvinyl chloride resin, 2-12g of zinc stearate, 2-12g of calcium stearate and 500-1300ml of dibutyl phthalate into slurry, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold coated with the slurry in an oven at 150-230 ℃ for 10-60min, and stripping after cooling to obtain the rubber sleeve.
And (3) the pressing pressure of the cold isostatic press in the step (2) is 180-250MPa, and the pressure maintaining time is 50-230s.
In the step 3, the sintering temperature in the sintering and forming process of the framework is 1800-2500 ℃, and the heat preservation time is 2-8h.
The length of the groove is integral multiple of the sum of the lengths of the mouth end and the mouth body, and the length between the adjacent mouth ends is the length of the mouth body.
In the step 5, the infiltration temperature in the copper infiltration process is 1200-1600 ℃, and the heat preservation time is 2-8h.
The beneficial effects of the invention are:
according to the preparation method of the composite tungsten-copper contact tube, the rubber sleeve and the infiltration mold can be used repeatedly, and the preparation method is suitable for large-scale batch production; compared with the traditional single welding method, the welding procedure of the nozzle body and the nozzle end is saved in the infiltration process, and the production efficiency is greatly improved; when the porous tungsten skeleton is infiltrated with copper, the copper solution is combined with the tungsten skeleton more tightly by capillary action, so that the defects of holes, solid inclusions, incomplete penetration and the like generated by a welding method are avoided, the mechanical property of the composite tungsten-copper conductive nozzle is greatly improved, and the arc ablation resistance and the adhesion resistance are further optimized.
Drawings
FIG. 1 is a schematic structural diagram of a copper infiltration mold for a method for manufacturing a composite tungsten-copper contact tip according to the present invention;
FIG. 2 is a distribution diagram of the contact tip in the copper infiltration mold according to the method for manufacturing the composite tungsten-copper contact tip of the present invention.
In the figure: 1. groove, 2 graphite boat.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A preparation method of a composite tungsten-copper contact tube comprises the following steps:
step 1, powder pretreatment: firstly, placing tungsten powder with the Fisher particle size of 2-10 um in a vacuum drying oven for drying and preheating, simultaneously dissolving 0.5-1.8 wt% of stearic acid in alcohol to serve as an additive, then placing the preheated tungsten powder and the additive in a stirrer for stirring for 10-90 min, fully volatilizing the alcohol, and placing the tungsten powder uniformly stirred in the vacuum drying oven for drying for later use;
step 2, preparing a rubber sleeve: preparing 800-1200g of polyvinyl chloride resin, 2-12g of zinc stearate, 2-12g of calcium stearate and 500-1300ml of dibutyl phthalate into slurry, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold in an oven at 150-230 ℃ for 10-60min, and cooling and stripping to obtain a rubber sleeve; filling the tungsten powder treated in the step 1 into a rubber sleeve, pressing the tungsten powder into a shape by using a cold isostatic press, wherein the pressing pressure is 180-250MPa, and the pressure maintaining time is 50-230s, so as to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton forming sintering to obtain a porous tungsten rod, namely a mouth end; the temperature in the framework forming and sintering process is 1800-2500 ℃, and the heat preservation time is 2-8 h;
step 4, using a graphite boat as an infiltration mold, as shown in fig. 1, arranging a plurality of grooves 1 at the bottom of the graphite boat side by side, wherein the length of each groove 1 is at least the sum of the lengths of a mouth end and a mouth body, placing the mouth end into the groove 1, and reserving a mouth body space; the reserved nozzle body space aims at infiltrating copper and filling the reserved space with liquid copper to form the combination of tungsten copper and nozzle body copper; as shown in figure 2 of the drawings, in which,
preferably, the length of the groove 1 is an integral multiple of the sum of the lengths of the mouth end and the mouth body, a plurality of mouth ends and mouth bodies can be placed in one groove 1, and the length between the adjacent mouth ends is the length of the mouth body;
step 5, according to the pre-calculated copper consumption, the copper consumption needs to meet the sum of the copper infiltration consumption of the mouth end and the quality of the mouth body, the electrolytic copper is flatly paved above the mouth end for copper infiltration, so that the liquid copper infiltrates the mouth end and fills the reserved space, and an infiltration rough blank of the composite tungsten-copper conductive mouth is obtained, wherein the temperature in the copper infiltration process is 1200-1600 ℃, and the heat preservation time is 2-8 hours;
and 6, machining the infiltration rough blank of the composite tungsten-copper conductive nozzle, removing redundant copper at the edge of the infiltration rough blank, performing single turning according to a tungsten-copper/copper mode, and then performing thread turning at the end of the nozzle body to obtain the composite tungsten-copper conductive nozzle.
Through the mode, according to the preparation method of the composite tungsten-copper contact tube, the rubber sleeve and the infiltration mold can be used repeatedly, and the preparation method is suitable for large-scale batch production; compared with the traditional single welding method, the welding procedure of the nozzle body and the nozzle end is saved in the infiltration process, and the production efficiency is greatly improved; when the porous tungsten skeleton is infiltrated with copper, the copper solution is combined with the tungsten skeleton more tightly by capillary action, so that the defects of holes, solid inclusions, incomplete penetration and the like generated by a welding method are avoided, the mechanical property of the composite tungsten-copper conductive nozzle is greatly improved, and the arc ablation resistance and the adhesion resistance are further optimized.
Example 1
Step 1, firstly, 50kg of tungsten powder with the Fisher size of 1.2um is placed in a vacuum drying oven for drying and preheating, 0.6wt% of stearic acid is dissolved in alcohol to be used as an additive, then the preheated tungsten powder and a molding agent are placed in a stirrer for stirring for 20min, the alcohol is fully volatilized at the moment, and the uniformly stirred tungsten powder is placed in the vacuum drying oven for drying again;
step 2, preparing slurry from 1000g of polyvinyl chloride resin, 5g of zinc stearate, 5g of calcium stearate and 1000ml of dibutyl phthalate, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold in a baking oven at 200 ℃ for 40min, cooling and stripping to obtain a rubber sleeve; filling the tungsten powder treated in the step 1 into a rubber sleeve, pressing the tungsten powder into a shape by using a cold isostatic press, wherein the pressing pressure is 180MPa, and the pressure maintaining time is 200s, so as to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton forming sintering to obtain a porous tungsten rod, namely a mouth end; the temperature in the framework molding and sintering process is 1800 ℃, and the heat preservation time is 4h;
step 4, using a graphite boat as an infiltration mold, arranging 6 grooves 1 at the bottom of the graphite boat side by side, wherein the length of each groove 1 is 3 of the sum of the lengths of a mouth end and a mouth body, placing the mouth end into the groove 1, and reserving a mouth body space;
step 5, according to the pre-calculated copper consumption, 57.3kg of copper consumption, spreading electrolytic copper above the mouth end for copper infiltration to enable liquid copper to infiltrate the mouth end and fill the reserved space to obtain an infiltration rough blank of the composite tungsten-copper conductive mouth, wherein the temperature in the copper infiltration process is 1300 ℃, and the heat preservation time is 4 hours;
and 6, machining the infiltration rough blank of the composite tungsten-copper conductive nozzle, removing redundant copper at the edge of the tungsten rod, turning and separating the tungsten rod and the copper rod singly according to a tungsten-copper/copper mode, and then turning threads at the end of the nozzle body to obtain the composite tungsten-copper conductive nozzle.
Example 2
Step 1, firstly, placing 60kg of tungsten powder with the Fisher particle size of 3.0um in a vacuum drying oven for drying and preheating, simultaneously dissolving 0.9wt% of stearic acid in alcohol to be used as an additive, then placing the preheated tungsten powder and a molding agent in a stirrer for stirring for 20min, fully volatilizing the alcohol at the moment, and placing the uniformly stirred tungsten powder in the vacuum drying oven for drying again;
step 2, preparing slurry from 1000g of polyvinyl chloride resin, 5g of zinc stearate, 5g of calcium stearate and 1000ml of dibutyl phthalate, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold in a baking oven at 200 ℃ for 40min, and cooling and stripping to obtain a rubber sleeve; filling the tungsten powder treated in the step 1 into a rubber sleeve, and pressing the tungsten powder into a shape by using a cold isostatic press, wherein the pressing pressure is 200MPa, and the pressure maintaining time is 180s, so as to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton forming sintering to obtain a porous tungsten rod, namely a mouth end; the temperature in the framework forming and sintering process is 1900 ℃, and the heat preservation time is 4h;
step 4, using a graphite boat as an infiltration mold, arranging 8 grooves 1 at the bottom of the graphite boat side by side, wherein the length of each groove 1 is 4 of the sum of the lengths of a nozzle end and a nozzle body, placing the nozzle end in each groove 1, and reserving a nozzle body space;
step 5, according to the pre-calculated copper consumption, the copper consumption is 68.6kg, electrolytic copper is flatly laid above the mouth end for copper infiltration, so that liquid copper infiltrates the mouth end and fills the reserved space, and an infiltration rough blank of the composite tungsten-copper conductive mouth is obtained, wherein the temperature in the copper infiltration process is 1300 ℃, and the heat preservation time is 4h;
and 6, machining the infiltration rough blank of the composite tungsten-copper conductive nozzle, removing redundant copper at the edge of the tungsten rod, turning and separating the tungsten rod and the copper rod singly according to a tungsten-copper/copper mode, and then turning threads at the end of the nozzle body to obtain the composite tungsten-copper conductive nozzle.
Example 3
Step 1, firstly, placing 70kg of tungsten powder with Fisher granularity of 4.5um in a vacuum drying oven for drying and preheating, simultaneously dissolving 1.2wt% of stearic acid in alcohol to be used as an additive, then placing the preheated tungsten powder and a molding agent in a stirrer for stirring for 45min, fully volatilizing the alcohol at the moment, and placing the uniformly stirred tungsten powder in the vacuum drying oven for drying again;
step 2, preparing slurry from 1000g of polyvinyl chloride resin, 5g of zinc stearate, 5g of calcium stearate and 1000ml of dibutyl phthalate, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold in a baking oven at 200 ℃ for 40min, cooling and stripping to obtain a rubber sleeve; filling the tungsten powder treated in the step 1 into a rubber sleeve, and pressing the tungsten powder into a shape by using a cold isostatic press, wherein the pressing pressure is 200MPa, and the pressure maintaining time is 180s, so as to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton forming sintering to obtain a porous tungsten rod, namely a mouth end; the temperature in the framework forming and sintering process is 2000 ℃, and the heat preservation time is 3 hours;
step 4, using a graphite boat as an infiltration mold, arranging 10 grooves 1 at the bottom of the graphite boat side by side, wherein the length of each groove 1 is 5 of the sum of the lengths of a nozzle end and a nozzle body, placing the nozzle end in the groove 1, and reserving a nozzle body space;
step 5, according to the pre-calculated copper consumption and 80kg of copper consumption, spreading electrolytic copper above the mouth end for copper infiltration to enable liquid copper to infiltrate the mouth end and fill the reserved space to obtain an infiltration rough blank of the composite tungsten-copper conductive mouth, wherein the temperature in the copper infiltration process is 1300 ℃, and the heat preservation time is 4 hours;
and 6, machining the infiltration rough blank of the composite tungsten-copper conductive nozzle, removing redundant copper at the edge of the tungsten rod, singly turning and separating according to a tungsten-copper/copper mode, and then turning threads at the end of the nozzle body to obtain the composite tungsten-copper conductive nozzle.
Example 4
Step 1, firstly, placing 80kg of tungsten powder with Fisher's particle size of 6.0um in a vacuum drying oven for drying and preheating, simultaneously dissolving 1.5wt% of stearic acid in alcohol to serve as an additive, then placing the preheated tungsten powder and a forming agent in a stirrer for stirring for 45min, fully volatilizing the alcohol at the moment, and placing the uniformly stirred tungsten powder in the vacuum drying oven for drying again;
step 2, preparing slurry from 1000g of polyvinyl chloride resin, 5g of zinc stearate, 5g of calcium stearate and 1000ml of dibutyl phthalate, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold in a baking oven at 200 ℃ for 40min, cooling and stripping to obtain a rubber sleeve; filling the tungsten powder treated in the step 1 into a rubber sleeve, and pressing the tungsten powder into a shape by using a cold isostatic press, wherein the pressing pressure is 250MPa, and the pressure maintaining time is 120s, so as to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton forming sintering to obtain a porous tungsten rod, namely a mouth end; the temperature in the framework molding and sintering process is 2200 ℃, and the heat preservation time is 5h;
step 4, using a graphite boat as an infiltration mold, arranging 12 grooves 1 at the bottom of the graphite boat side by side, wherein the length of each groove 1 is 6 of the sum of the lengths of a mouth end and a mouth body, placing the mouth end into the groove 1, and reserving a mouth body space;
step 5, according to the pre-calculated copper consumption, the copper consumption is 91kg, electrolytic copper is flatly laid above the mouth end for copper infiltration, so that liquid copper infiltrates the mouth end and fills the reserved space, and an infiltration rough blank of the composite tungsten-copper conductive mouth is obtained, wherein the temperature in the copper infiltration process is 1300 ℃, and the heat preservation time is 4h;
and 6, machining the infiltration rough blank of the composite tungsten-copper conductive nozzle, removing redundant copper at the edge of the tungsten rod, turning and separating the tungsten rod and the copper rod singly according to a tungsten-copper/copper mode, and then turning threads at the end of the nozzle body to obtain the composite tungsten-copper conductive nozzle.
Example 5
Step 1, firstly, placing 90kg of tungsten powder with the Fisher particle size of 7.5um in a vacuum drying oven for drying and preheating, simultaneously dissolving 1.8wt% of stearic acid in alcohol to be used as an additive, then placing the preheated tungsten powder and a molding agent in a stirrer for stirring for 60min, fully volatilizing the alcohol at the moment, and placing the uniformly stirred tungsten powder in the vacuum drying oven for drying again;
step 2, preparing slurry from 1000g of polyvinyl chloride resin, 5g of zinc stearate, 5g of calcium stearate and 1000ml of dibutyl phthalate, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold in a baking oven at 200 ℃ for 40min, cooling and stripping to obtain a rubber sleeve; filling the tungsten powder treated in the step 1 into a rubber sleeve, and pressing the tungsten powder into a shape by using a cold isostatic press, wherein the pressing pressure is 250MPa, and the pressure maintaining time is 120s, so as to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton molding sintering to obtain a porous tungsten rod, namely a mouth end; the temperature in the framework forming and sintering process is 2400 ℃, and the heat preservation time is 6 hours;
step 4, using a graphite boat as an infiltration mold, arranging 14 grooves 1 at the bottom of the graphite boat side by side, wherein the length of each groove 1 is 6 of the sum of the lengths of a mouth end and a mouth body, placing the mouth end into the groove 1, and reserving a mouth body space;
step 5, according to the pre-calculated copper consumption, the copper consumption is 102.7kg, electrolytic copper is flatly paved above the mouth end for copper infiltration, so that liquid copper infiltrates the mouth end and fills the reserved space, and an infiltration rough blank of the composite tungsten-copper conductive mouth is obtained, wherein the temperature in the copper infiltration process is 1300 ℃, and the heat preservation time is 4 hours;
and 6, machining the infiltration rough blank of the composite tungsten-copper conductive nozzle, removing redundant copper at the edge of the tungsten rod, turning and separating the tungsten rod and the copper rod singly according to a tungsten-copper/copper mode, and then turning threads at the end of the nozzle body to obtain the composite tungsten-copper conductive nozzle.

Claims (7)

1. A preparation method of a composite tungsten-copper contact tube is characterized by comprising the following steps:
step 1, mixing tungsten powder and an alcohol solution dissolved with stearic acid, pouring the mixture into a stirrer for stirring, uniformly stirring, and drying, wherein the content of the stearic acid is 0.5-1.8 wt%;
step 2, filling the tungsten powder treated in the step 1 into a rubber sleeve, and pressing the tungsten powder into a shape by using a cold isostatic press to obtain a green body;
step 3, placing the green body in a hydrogen sintering furnace for skeleton forming sintering to obtain a mouth end;
step 4, arranging a plurality of grooves at the bottom of the graphite boat side by side, wherein the length of each groove is at least the sum of the lengths of the nozzle end and the nozzle body, placing the nozzle end in the groove, and reserving a nozzle body space;
step 5, spreading electrolytic copper above the mouth end for copper infiltration to enable liquid copper to infiltrate the mouth end and fill the reserved space, and obtaining an infiltration rough blank of the composite tungsten-copper conductive mouth;
and 6, processing the infiltration rough blank of the composite tungsten-copper contact tube to obtain the composite tungsten-copper contact tube.
2. The method as claimed in claim 1, wherein the Fisher size of the tungsten powder in step 1 is 2-10 um.
3. The method for preparing a composite tungsten-copper contact tube according to claim 1, wherein the step 2 comprises the following steps: preparing 800-1200g of polyvinyl chloride resin, 2-12g of zinc stearate, 2-12g of calcium stearate and 500-1300ml of dibutyl phthalate into slurry, coating the slurry on the outer side of a stainless steel mold, baking the stainless steel mold coated with the slurry in an oven at 150-230 ℃ for 10-60min, and stripping after cooling to obtain the rubber sleeve.
4. The method for preparing a composite W-Cu contact tube as claimed in claim 1, wherein the pressing pressure of the isostatic cooling press in step 2 is 180-250MPa, and the dwell time is 50-230s.
5. The method for preparing a composite W-Cu contact tube as claimed in claim 1, wherein the temperature in the skeleton forming and sintering process in step 3 is 1800-2500 ℃, and the heat preservation time is 2-8h.
6. The method as claimed in claim 1, wherein the length of the groove is an integral multiple of the sum of the lengths of the nozzle ends and the nozzle body, and the length between adjacent nozzle ends is the length of the nozzle body.
7. The method for preparing a composite W-Cu contact tube as claimed in claim 1, wherein the temperature of the copper infiltration process in step 5 is 1200-1600 ℃ and the holding time is 2-8h.
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CN100566917C (en) * 2008-07-04 2009-12-09 冯发桂 The production method of copper-tungsten alloy conducting nozzle of cylindrical form
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