CN104972133B

CN104972133B - Method for preparing Cu-based SiC composite micro powder for electrode of electric spark tool

Info

Publication number: CN104972133B
Application number: CN201510421795.8A
Authority: CN
Inventors: 李丽; 魏修亭; 田忠强; 王东
Original assignee: Shandong University of Technology
Current assignee: Shandong University of Technology
Priority date: 2015-07-18
Filing date: 2015-07-18
Publication date: 2017-01-25
Anticipated expiration: 2035-07-18
Also published as: CN104972133A

Abstract

The invention discloses a method for preparing Cu-based SiC composite micro powder for an electrode of an electric spark tool and belongs to the technical field of electric discharge machining. The method relates to a funnel. The method is characterized in that electroless copper plating and drying are conducted on the surface of SiC particles, so that SiC copper-plated particles are obtained; molten Cu is poured into the funnel, the SiC copper-plated particles are added into a uniform feeder, the SiC copper-plated particles enter a guide pipe evenly by means of a feeding pipe and are blown out of the guide pipe under the constant-speed wind force of a high-pressure nitrogen source, the peripheries of the SiC copper-plated particles are wrapped in the molten Cu, the SiC copper-plated particles drip down from a discharge spout together with the molten Cu, and the SiC copper-plated particles wrapped by the molten Cu are atomized into composite micro powder by means of gas. According to the method, the SiC particles are blown into the molten Cu in a dispersed mode by means of nitrogen, and thus the distribution uniformity of the SiC particles is improved; meanwhile, by increasing the feeding speed of the SiC copper-plated particles, the content of the SiC particles can be flexibly increased, and the electric corrosion resistance can be improved easily.

Description

A kind of edm tool electrode preparation method of cu base sic composite micro-powder

Technical field

The invention belongs to spark discharge processing technique field is and in particular to a kind of edm tool electrode cu base sic The preparation method of composite micro-powder.

Background technology

Because spark technology has other adding at aspects such as processing property material, labyrinth and micro-workpieces The incomparable superiority of work method, is gradually obtained popularization and application in recent years.During spark discharge processing, quilt Scrupulously and respectfully change, gasify, workpiece material candle is not only removed by the electrode material dished out that explodes, also Tool-electrode material candle being removed simultaneously Fall, this has just been inevitably generated the loss of tool-electrode, and the loss of tool-electrode maps directly on workpiece, affects it Formed precision.

In order to improve the formed precision of workpiece, some experts and scholars have put into the research to tool-electrode.Wherein, this Shen Inventor associate professor Li Li please have developed a kind of combination electrode it is intended to can be improving workpiece by improving the electrical erosion resistance of electrode Forming Quality, and propose application for a patent for invention to China, its Application No. 201410130305.4, this electrode is to adopt table Sic and tib of face electroless copper₂Micropowder by be electrodeposited in Copper substrate formed although improve instrument to a certain extent The electrical erosion resistance energy of electrode, but sic and tib adding in electrode₂Distribution is simultaneously uneven, and addition is not easy to control, this A little serviceabilities that all largely have impact on electrode.

Inventor after further research, finds that the second phase microgranule of interpolation to be made can relatively evenly be distributed in Metal Substrate In body, the preparation of the second phase microgranule is the technical problem first having to solve.

Content of the invention

The technical problem to be solved is to provide a kind of system of edm tool electrode cu base sic composite micro-powder Preparation Method, it is possible to increase the distributing homogeneity of the second phase microgranule.

For solving above-mentioned technical problem, the technical scheme is that a kind of edm tool electrode cu base sic of invention The preparation method of composite micro-powder, including funnel it is characterised in that: step is as follows:

(1) electroless copper: sic is made the microgranule that particle diameter is 3～5um, electroless copper is carried out to sic microparticle surfaces and does Dry, prepared sic copper facing microgranule；

(2) prepare liquation: pure for metal cu is heated to 1150～1180 DEG C, prepared cu liquation；

(3) microgranule implantation: conduit is set in funnel, and the lower end of conduit is located at the place of leting slip a remark of funnel bottom, upper end connection Elevated pressure nitrogen source of the gas, conduit also connects feed pipe, and the other end of feed pipe connects uniform feed appliance；The bottom of funnel arranges dress of supplying gas Put, the gas outlet of air supply plant is towards place of leting slip a remark；

The cu liquation that step (2) is obtained is poured in funnel, and the sic copper facing microgranule that step (1) is obtained is added to uniform feeding In device, open elevated pressure nitrogen source of the gas, uniform feed appliance and air supply plant simultaneously, sic copper facing microgranule pass through feed pipe evenly into Conduit, and be blown conduit under the at the uniform velocity wind-force of elevated pressure nitrogen source of the gas, cu liquation is coated on the periphery together of sic copper facing microgranule From leting slip a remark, composite micro-powder is become by gas atomization；

(4) screen: the composite micro-powder that step (3) is obtained crosses 100～150 mesh sieves, takes lower part of screen to divide.

Preferably, in step (1), the operating temperature of electroless copper is 80 DEG C, and the electroless copper time is 3 hours.

Preferably, in step (1) chemical plating solution used by 14～16 mass parts copper sulphate pentahydrate, 25～32 mass parts first Aldehyde and 10～12 mass parts sodium hydroxide are dissolved in 1000 mass parts water and making.

Preferably, sic microgranule and the mass ratio of chemical plating solution are 1:10.

Preferably, in step (3), the aspirated pressure of air supply plant is 1.2～1.4mpa.

Compared with prior art, the invention has the beneficial effects as follows:

1st, the present invention using high pressure nitrogen, the sic uniformly sending copper facing microgranule is blown in cu liquation to be spilt, quilt Cu liquation is coated, and together spills from let slip a remark with cu liquation, is cooled to cu base sic composite micro-powder through gas atomization, makes height Fusing point sic microgranule is evenly distributed in spherical substrate copper, improves the uniformity of sic Particle Distribution；Pass through to increase sic plating simultaneously The feeding speed of copper microgranule can flexibly improve the content of sic microgranule, beneficial to raising electrical erosion resistance energy；In addition sic microgranule passes through Electroless copper increases the bond strength with cu liquation so as to give full play to electrical erosion resistance energy after processing.

2nd, contain sic microgranule due in cu matrix, improve the absorbance to laser for the cu, be to utilize laser sintering and moulding Electrode provides favourable technical support.

Brief description

Fig. 1 is the structure chart of powder manufacturing apparatus.

Reference is: 1, funnel；2nd, conduit；3rd, elevated pressure nitrogen source of the gas；4th, uniform feed appliance；5th, feed pipe；6th, supply gas dress Put；7th, gas outlet；8th, let slip a remark.

Specific embodiment

With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.

Embodiment one

A kind of edm tool electrode cu base sic composite micro-powder be obtained according to following steps successively:

(1) sic is made the microgranule that particle diameter is 3um, by the copper sulphate pentahydrate of 14 mass parts, the formaldehyde of 25 mass parts and 10 The sodium hydroxide of mass parts is dissolved in the water of 1000 mass parts makes chemical plating solution, and sic microgranule is put in chemical plating solution Row Electroless copper is simultaneously dried, and sic microgranule is 1:10 with the mass ratio of chemical plating solution, prepared sic copper facing microgranule；Chemical plating The operating temperature of copper is 80 DEG C, and the time is 3 hours；

(2) pure for metal cu is heated to 1150 DEG C, prepared cu liquation；

(3) conduit 2 is set in funnel 1, the lower end of conduit 2 be located at funnel 1 bottom let slip a remark at 8, upper end connection high pressure Source nitrogen 3, conduit 2 also connects feed pipe 5, and the other end of feed pipe 5 connects uniform feed appliance 4；The bottom setting of funnel 1 is supplied gas Device 6, the gas outlet 7 of air supply plant 6 is towards leting slip a remark at 8；

The cu liquation that step (2) is obtained is poured in funnel 1, and the sic copper facing microgranule that step (1) is obtained is added to uniform feeding In device 4, open elevated pressure nitrogen source of the gas 3, uniform feed appliance 4 and air supply plant 6, sic copper facing microgranule passes through feed pipe 5 equably simultaneously Enter conduit 2, and be blown conduit 2 under the at the uniform velocity wind-force of elevated pressure nitrogen source of the gas 3, cu liquation is coated on the outer of sic copper facing microgranule Week simultaneously together 8 leaks down from leting slip a remark, and the gas atomization being sprayed by air supply plant 6 becomes composite micro-powder；Wherein, the supplying gas of air supply plant 6 Pressure is 1.2mpa

(4) composite micro-powder that step (3) is obtained crosses 100 mesh sieves, takes lower part of screen to divide.

Embodiment two

The present embodiment is with the difference of embodiment one: in step (1), the particle diameter of sic microgranule is 4um, and chemical plating is molten In liquid, the mass fraction of copper sulphate pentahydrate is 15 parts, and the mass fraction of formaldehyde is 28 parts, and the mass fraction of sodium hydroxide is 11 parts； In step (2), the heating-up temperature of the pure cu of metal is 1165 DEG C；In step (3), the aspirated pressure of air supply plant 6 is 1.3mpa；Step (4) in, the grit number of crossing of composite micro-powder is 125 mesh.

Embodiment three

The present embodiment is with the difference of embodiment one: in step (1), the particle diameter of sic microgranule is 5um, and chemical plating is molten In liquid, the mass fraction of copper sulphate pentahydrate is 16 parts, and the mass fraction of formaldehyde is 32 parts, and the mass fraction of sodium hydroxide is 12 parts； In step (2), the heating-up temperature of the pure cu of metal is 1180 DEG C；In step (3), the aspirated pressure of air supply plant 6 is 1.4mpa；Step (4) in, the grit number of crossing of composite micro-powder is 150 mesh.

Using high pressure nitrogen, sic microgranule is blown in the cu liquation of funnel 1 bottom using said method, on the one hand avoids The rising phenomenon of sic microgranule；On the other hand sic microgranule is dispelled out, increase its distributing homogeneity.And can be by adjusting sic The feeding amount of copper facing microgranule, flexibly controls the content of sic microgranule, thus preparing the tool-electrode of different demands.

The above, be only presently preferred embodiments of the present invention, is not the restriction that the present invention is made with other forms, appoints What those skilled in the art is combined, changes or retrofits possibly also with the technology contents of the disclosure above and is the present invention Equivalent embodiments.But every without departing from technical solution of the present invention content, the technical spirit according to the present invention is implemented to above Any simple modification, equivalent variations and remodeling that example is made, still fall within the protection domain of technical solution of the present invention.

Claims

1. a kind of edm tool electrode preparation method of cu base sic composite micro-powder, including funnel it is characterised in that: step As follows:

(1) electroless copper: sic is made the microgranule that particle diameter is 3～5um, sic microparticle surfaces is carried out with electroless copper and is dried, Prepared sic copper facing microgranule；

(3) microgranule implantation: conduit is set in funnel, and the lower end of conduit is located at the place of leting slip a remark of funnel bottom, upper end connection high pressure Source nitrogen, conduit also connects feed pipe, and the other end of feed pipe connects uniform feed appliance；The bottom setting air supply plant of funnel, The gas outlet of air supply plant is towards place of leting slip a remark；

The cu liquation that step (2) is obtained is poured in funnel, and the sic copper facing microgranule that step (1) is obtained is added in uniform feed appliance, Open elevated pressure nitrogen source of the gas, uniform feed appliance and air supply plant, sic copper facing microgranule passes through feed pipe evenly into conduit simultaneously, And it is blown conduit under the at the uniform velocity wind-force of elevated pressure nitrogen source of the gas, cu liquation is coated on the periphery of sic copper facing microgranule and together from leakage Mouth leaks down, and is become composite micro-powder by gas atomization；

2. the edm tool electrode according to claim 1 preparation method of cu base sic composite micro-powder, its feature exists In: in step (1), the operating temperature of electroless copper is 80 DEG C, and the electroless copper time is 3 hours.

3. the edm tool electrode according to claim 2 preparation method of cu base sic composite micro-powder, its feature exists In: in step (1), chemical plating solution used is by 14～16 mass parts copper sulphate pentahydrate, 25～32 mass parts formaldehyde and 10～12 matter Amount part sodium hydroxide is dissolved in 1000 mass parts water to be made.

4. the edm tool electrode according to claim 3 preparation method of cu base sic composite micro-powder, its feature exists In: sic microgranule is 1:10 with the mass ratio of chemical plating solution.

5. according to Claims 1-4 arbitrary described edm tool electrode preparation method of cu base sic composite micro-powder, its It is characterised by: in step (3), the aspirated pressure of air supply plant is 1.2～1.4mpa.