CN112760513B - Silver tin oxide electrical contact material and preparation process thereof - Google Patents
Silver tin oxide electrical contact material and preparation process thereof Download PDFInfo
- Publication number
- CN112760513B CN112760513B CN202011605269.4A CN202011605269A CN112760513B CN 112760513 B CN112760513 B CN 112760513B CN 202011605269 A CN202011605269 A CN 202011605269A CN 112760513 B CN112760513 B CN 112760513B
- Authority
- CN
- China
- Prior art keywords
- powder
- tin oxide
- driving motor
- controller
- tantalum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/06—Alloys based on silver
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
- H01H1/023—Composite material having a noble metal as the basic material
- H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
Abstract
The invention relates to the technical field of electric contact material manufacturing, in particular to a silver tin oxide electric contact material and a preparation process thereof, wherein the silver tin oxide electric contact material comprises the following components in percentage by mass: 92-80%, tin oxide (SnO 2): 4-17%, niobium pentoxide (Nb2O 5): 0.1-4%, tantalum pentoxide (Ta2O 5): 0.1-4%; the method comprises the steps of ball-milling tin oxide powder, tantalum pentoxide powder and niobium pentoxide powder, then reducing and diffusing under hydrogen, calcining at high temperature in air, crushing to obtain tin-tantalum-niobium composite oxide powder, mechanically mixing silver powder and the tantalum-niobium-tin composite oxide powder, ball-milling, pressing, sintering, and re-pressing to obtain the silver tin oxide material electrical contact.
Description
Technical Field
The invention relates to the technical field of electric contact material manufacturing, in particular to a silver tin oxide electric contact material and a preparation process thereof.
Background
In the prior art, a method for preparing an electrical contact material is to put tin (Sn), bismuth (Bi), copper (Cu), indium (In), nickel (Ni) and silver (Ag) into an intermediate frequency smelting furnace to smelt into an alloy melt, so as to prepare an Ag alloy; and sintering at high temperature in an oxygen-containing atmosphere to obtain the silver tin oxide material.
The silver tin oxide material electrical contact material prepared by the method has certain defects, 1. the center of the material has a poor oxidation area, so that local components are not uniform, and main metal oxide additives with low melting points such as bismuth (Bi), indium (In) and the like are easy to melt and volatilize at high temperature of an electric arc, wherein the melting point of bismuth trioxide (Bi 2O 3) is as follows: 824 degrees celsius, indium trioxide (In 2O 3): volatilization point 850 ℃, below silver (Ag) melting point: 960 ℃, the adding proportion of copper and nickel is limited, and the excessive adding amount of the above elements causes the mechanical processing performance of the material to be deteriorated; 2. because the melting point of silver (Ag) is 960 ℃, special additives beneficial to improving the electrical performance, such as tantalum (the melting point of Ta is 2995 ℃) and niobium (the melting point of Nb is 2477 ℃) and other high-temperature metal elements cannot be added during alloy smelting.
Disclosure of Invention
Aiming at the current situation of the prior art, the invention provides a silver tin oxide electrical contact material and a preparation process thereof in order to develop a powder metallurgy silver tin oxide material containing tantalum (Ta) and niobium (Nb) high-temperature elements and improve the adhesion resistance of the silver tin oxide electrical contact material manufactured by the current internal oxidation process under the high-temperature electric arc environment.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a silver tin oxide electrical contact material comprises the following components in percentage by mass: 92-80%, tin oxide (SnO 2): 4-17%, niobium pentoxide (Nb2O 5): 0.1-4%, tantalum pentoxide (Ta2O 5): 0.1-4%; and after mechanically mixing the silver powder and the tantalum-niobium-tin composite oxide powder, performing ball milling, pressing, sintering and repressing to prepare the silver-tin oxide material electric contact.
A preparation process of a silver tin oxide electrical contact material comprises the following steps:
(1) the ingredient proportion is that the ingredient proportion is silver (Ag): 90%, tin oxide (SnO 2): 8.8%, niobium pentoxide (Nb2O 5): 0.6%, tantalum pentoxide (Ta2O 5): 0.6 percent;
(2) adding niobium pentoxide powder and tantalum pentoxide powder into tin oxide powder, ball-milling for 24 hours, keeping the temperature in a hydrogen annealing furnace at 700 ℃ for 2 hours, keeping the temperature in air atmosphere for 3 hours, crushing, and sieving with a 325-mesh sieve to prepare tin-tantalum-niobium composite oxide powder;
(3) mixing the tin-tantalum-niobium composite oxide powder prepared in the step (2) with silver powder for 4 hours, and ball-milling for 12 hours after the mixing is finished;
(4) pressing: pressing the powder particles into blanks by a pressing machine, wherein the size specification is 5.0mm in diameter and 1.0mm in thickness;
(5) and (3) sintering: sintering in air for 4 hours at 900 ℃;
(7) repressing: sizing the contact to a diameter of 5.0mm and a thickness of 0.89mm
(8) And (3) detection: and detecting the density, the hardness, the conductivity, the metallographic phase and the electrical property.
Preferably, the press in step (4) is a novel automatic press, which can realize high-efficiency pressing, and is characterized by comprising a press body, wherein a lower pressing device is installed on an upper cover plate in the press body, a first driving motor and a distance detection sensor are arranged in the lower pressing device, the first driving motor is used for driving a punch on the lower pressing device to perform pressing movement, the first driving mechanism and the distance detection sensor are both connected with a controller, the controller is installed in the press body, the controller is powered by an electric cabinet box installed outside the press body, an upper jacking device is installed on the lower cover plate of the press body relative to the lower pressing device, a second driving motor and an obstacle detection sensor are arranged in the upper jacking device, and the second driving motor and the obstacle detection sensor are both connected with the controller, the ejection head on the ejecting device is driven by the second driving motor to eject upwards, the surface of the ejecting device is connected with a die mounting seat, a cavity is formed in the die mounting seat, a press-fitting die is mounted in the cavity and used for placing powder particles, the powder particles are pressed into a blank under the downward pressing motion of the punch, and the blank is ejected under the upward ejecting motion of the ejection head.
By adopting the technical scheme, the automatic on-off of the first driving motor and the second driving motor can be realized under the action of the controller, the upper jacking device is internally provided with the obstacle detection sensor, when the situation that the material in the press-fitting die reaches the induction value is detected, the obstacle detection sensor transmits the obtained signal to the controller, the controller controls the upper jacking device to operate after analysis, the distance detection sensor in the upper jacking device is started firstly during operation, the initial height is detected, the placing height of the punch and the powder particles in the press-fitting die is measured, the upper jacking device cannot be started when the distance is smaller than the set value, unsafe factors caused by the interference of other objects or manual operation between the punch and the press-fitting die are avoided, if the distance is the set value, the controller controls the punch to press a blank, and after the upper jacking device senses impact, the obstacle detection sensor feeds back a signal to the controller, thereby controlling the ejection of the ejector head to realize the automatic demoulding of the blank.
The pushing device is further arranged in the press body and fixed in a first mounting seat, the first mounting seat is fixed on the inner wall of the press, the pushing device comprises a third driving motor, the third driving motor is connected to a controller, a toothed cylinder is sleeved at a rotating shaft end of the third driving mechanism and used for driving a toothed belt meshed on two rotating shafts, the rotating shafts are connected in second mounting seats at two ends of the pushing device and driven by the rotating shafts to rotate in an annular mode, a side gear of the toothed belt is connected with a sliding block, the sliding block is clamped in a first slide way of the pushing mechanism, so that the sliding block can move back and forth on one side of the toothed belt under the driving of the toothed belt, the sliding block is connected to one end of a pushing rod, and the other end of the pushing rod is connected with a material discharging box, the material placing box is connected with the second slide way of the die mounting seat in a clamping mode through a limiting block, a stress sensor is arranged in the limiting block and connected with the controller, and the material placing box is driven by the sliding block to slide back and forth in the second slide way, so that the blank is pushed out of the machine body.
By adopting the technical scheme, after demoulding is finished, the blank can be ejected to the same horizontal height with the mould mounting seat, the obstacle detection sensor transmits an ejection signal to the controller, the controller controls the third driving motor of the ejecting device to operate after data analysis, thereby, under the drive of the dentate column, the toothed belt rotates around the rotating shaft and drives the slide block to move forwards in the first sliding direction, the push-out rod drives the discharging box to push forwards under the action of the second slideway, so that the blank is pushed into the discharging basket which is arranged well, because the bottom of blowing box is equipped with the stopper, the stopper can restrict the blowing box and release the distance, and the blowing box receives the effect of stopper and can receive a power of going back when releasing, and produced power is through the force sensor who is equipped with in the stopper with atress signal feedback to controller to control third driving motor reversal, thereby realize that the blowing box pushes back.
Further set up as, open on the top of blowing box has the feed inlet, open the bottom of blowing box has a plurality of discharge gates, the feed inlet is connected with the pipeline, the other end of pipeline is connected in feed arrangement's discharge gate, feed arrangement be embedded in the roof of briquetting machine pours into the powder granule in the feed arrangement, via the pipeline falls into in the blowing box, the blowing box is in push down of the drive of slider extremely on the pressure equipment mould, the powder granule in the blowing box passes through the discharge gate falls into in the pressure equipment mould to realize automatic material conveying.
By adopting the technical scheme, the feeding hole at the top end of the discharging box is connected with the feeding device through the pipeline, automatic feeding can be realized by reducing materials in the discharging box, the bottom end of the discharging box is provided with a plurality of discharging holes, and after the blank is pushed out by the discharging box, feeding can be automatically carried out in the press-fitting die, so that automatic feeding is realized.
Compared with the prior art, the invention has the advantages that:
by adopting the technical scheme, after the tantalum-niobium element is added into the electric contact material prepared by the invention, the adhesion resistance of the silver tin oxide electric contact material prepared by the existing internal oxidation process under the high-temperature environment of an electric arc can be effectively improved, and after an electric property test, the adhesion times of the material are all 0 through repeated connection, and the material has good electric property.
The novel automatic pressing machine adopted by the invention can realize high-efficiency blank manufacturing, has high safety factor, and realizes the orderly operation of each large functional module in the pressing machine through the setting of each sensor and the algorithm calculation of the controller, thereby improving the efficiency.
Drawings
FIG. 1 is a gold phase diagram of a conventional internal oxidation process;
FIG. 2 is a gold phase diagram of the material of the present invention;
FIG. 3 is a gold phase diagram prepared in example 1 of the present invention;
FIG. 4 is a gold phase diagram prepared in example 2 of the present invention;
FIG. 5 is a gold phase diagram prepared in example 3 of the present invention;
FIG. 6 is a gold phase diagram prepared in example 4 of the present invention;
fig. 7 is a schematic view of the overall structure of the press.
Which comprises the following steps: 1. a body; 11. a stamping device; 111. a punch; 12. a controller; 13. a jacking device; 131. ejecting the head; 14. a die mounting seat; 141. a cavity; 142. pressing a mould; 143. a second slideway; 15. a push-out device; 151. a first mounting seat; 152. a toothed cylinder; 153. a rotating shaft; 154. a toothed belt; 155. a second mounting seat; 156. a slider; 157. a first slideway; 158. pushing out the rod; 16. placing a material box; 17. a feeding device; 2. an electric cabinet box.
Detailed Description
As shown in fig. 1 to 7, the invention discloses a silver tin oxide electrical contact material and a preparation process thereof.
A silver tin oxide electrical contact material comprises the following components in percentage by mass: 92-80%, tin oxide (SnO 2): 4-17%, niobium pentoxide (Nb2O 5): 0.1-4%, tantalum pentoxide (Ta2O 5): 0.1-4%; and after mechanically mixing the silver powder and the tantalum-niobium-tin composite oxide powder, performing ball milling, pressing, sintering and repressing to prepare the silver-tin oxide material electric contact.
A preparation process of a silver tin oxide electrical contact material comprises the following steps:
example 1
The preparation method comprises the following steps:
(1) the ingredient proportion is that the ingredient proportion is silver (Ag): 90%, tin oxide (SnO 2): 8.8%, niobium pentoxide (Nb2O 5): 0.4%, tantalum pentoxide (Ta2O 5): 0.6 percent;
(2) adding niobium pentoxide powder and tantalum pentoxide powder into tin oxide powder, ball-milling for 24 hours, keeping the temperature in a hydrogen annealing furnace at 700 ℃ for 2 hours, keeping the temperature in air atmosphere for 3 hours, crushing, and sieving with a 325-mesh sieve to prepare tin-tantalum-niobium composite oxide powder;
(3) mixing the tin-tantalum-niobium composite oxide powder prepared in the step (2) with silver powder for 4 hours, and ball-milling for 12 hours after the mixing is finished;
(4) pressing: pressing the powder particles into blanks by a pressing machine, wherein the size specification is 5.0mm in diameter and 1.0mm in thickness;
(5) and (3) sintering: sintering in air for 4 hours at 900 ℃;
(7) repressing: sizing the contact to a diameter of 5.0mm and a thickness of 0.89mm
(8) And (3) detection: and detecting the density, the hardness, the conductivity, the metallographic phase and the electrical property.
Example 2
The preparation method comprises the following steps:
(1) the ingredient proportion is that the ingredient proportion is silver (Ag): 88%, tin oxide (SnO 2): 10%, niobium pentoxide (Nb2O 5): 1%, tantalum pentoxide (Ta2O 5): 1 percent;
(2) adding niobium pentoxide powder and tantalum pentoxide powder into tin oxide powder, ball-milling for 24 hours, keeping the temperature in a hydrogen annealing furnace at 700 ℃ for 2 hours, keeping the temperature in air atmosphere for 3 hours, crushing, and sieving with a 325-mesh sieve to prepare tin-tantalum-niobium composite oxide powder;
(3) mixing the tin-tantalum-niobium composite oxide powder prepared in the step (2) with silver powder for 4 hours, and ball-milling for 12 hours after the mixing is finished;
(4) pressing: pressing the powder particles into blanks by a pressing machine, wherein the size specification is 5.0mm in diameter and 1.0mm in thickness;
(5) and (3) sintering: sintering in air for 4 hours at the temperature of 910 ℃;
(7) repressing: sizing the contact to a diameter of 5.0mm and a thickness of 0.89mm
(8) And (3) detection: and detecting the density, the hardness, the conductivity, the metallographic phase and the electrical property.
Example 3
The preparation method comprises the following steps:
(1) the ingredient proportion is that the ingredient proportion is silver (Ag): 85%, tin oxide (SnO 2): 12%, niobium pentoxide (Nb2O 5): 1.5%, tantalum pentoxide (Ta2O 5): 1.5 percent;
(2) adding niobium pentoxide powder and tantalum pentoxide powder into tin oxide powder, ball-milling for 24 hours, keeping the temperature in a hydrogen annealing furnace at 700 ℃ for 2 hours, keeping the temperature in air atmosphere for 3 hours, crushing, and sieving with a 325-mesh sieve to prepare tin-tantalum-niobium composite oxide powder;
(3) mixing the tin-tantalum-niobium composite oxide powder prepared in the step (2) with silver powder for 4 hours, and ball-milling for 12 hours after the mixing is finished;
(4) pressing: pressing the powder particles into blanks by a pressing machine, wherein the size specification is 5.0mm in diameter and 1.0mm in thickness;
(5) and (3) sintering: sintering in air for 5 hours at 920 ℃;
(7) repressing: sizing the contact to a diameter of 5.0mm and a thickness of 0.89mm
(8) And (3) detection: and detecting the density, the hardness, the conductivity, the metallographic phase and the electrical property.
Example 4
The preparation method comprises the following steps:
(1) the ingredient proportion is that the ingredient proportion is silver (Ag): 80%, tin oxide (SnO 2): 17%, niobium pentoxide (Nb2O 5): 1.5%, tantalum pentoxide (Ta2O 5): 1.5 percent;
(2) adding niobium pentoxide powder and tantalum pentoxide powder into tin oxide powder, ball-milling for 24 hours, keeping the temperature in a hydrogen annealing furnace at 700 ℃ for 2 hours, keeping the temperature in air atmosphere for 3 hours, crushing, and sieving with a 325-mesh sieve to prepare tin-tantalum-niobium composite oxide powder;
(3) mixing the tin-tantalum-niobium composite oxide powder prepared in the step (2) with silver powder for 4 hours, and ball-milling for 12 hours after the mixing is finished;
(4) pressing: pressing the powder particles into blanks by a pressing machine, wherein the size specification is 5.0mm in diameter and 1.0mm in thickness;
(5) and (3) sintering: sintering in air for 5 hours at 930 ℃;
(7) repressing: sizing the contact to a diameter of 5.0mm and a thickness of 0.89mm
(8) And (3) detection: and detecting the density, the hardness, the conductivity, the metallographic phase and the electrical property.
The technical effects are as follows:
the test standard refers to the technical conditions for the wire for the GB/T8633-2006 rivet type electrical contact; a JB/T8985-1999 electric contact material metallographic examination method; GB 10963-1 overcurrent protection circuit breaker for electric accessories household and similar places part 1 circuit breaker for alternating current
As known from the table, after the silver tin oxide electrical contact material prepared by the preparation method is subjected to electrical property tests, the bonding times of the material are all 0 through repeated connection, the anti-bonding performance of the silver tin oxide electrical contact material manufactured by the conventional internal oxidation process under the high-temperature electric arc environment can be effectively improved, and the silver tin oxide electrical contact material has good electrical property.
The press of the invention is a novel automatic press, can realize high-efficiency pressing, and comprises a machine body 1, wherein a lower pressing device 11 is arranged on an upper cover plate in the machine body 1, a first driving motor and a distance detection sensor are arranged in the lower pressing device 11, the first driving motor is used for driving a punch 111 on the lower pressing device to perform pressing movement, the first driving mechanism and the distance detection sensor are both connected with a controller 12, the controller 12 is arranged in the machine body 1, the controller 12 is powered by a control cabinet arranged outside the machine body 1, an upper jacking device 13 is arranged on the lower cover plate of the machine body 1 relative to the lower pressing device, a second driving motor and an obstacle detection sensor are arranged in the upper jacking device 13, the second driving motor and the obstacle detection sensor are both connected with the controller 12, a jacking head 131 on the upper jacking device 13 is driven by the second driving motor to realize upward jacking, the surface of the upper jacking device 13 is connected with a die mounting seat 14, a cavity 141 is formed in the die mounting seat 14, a press-fitting die 142 is arranged in the cavity 141, particles prepared in the step (4) are placed in the press-fitting die 142, a blank is pressed by the downward pressing motion of the punch 111, the blank is ejected by the upward ejecting motion of the ejector 131, the automatic opening and closing of the first driving motor and the second driving motor can be realized under the action of the controller 12, an obstacle detection sensor is arranged in the upward ejecting device 13, when the material in the press-fitting die 142 is detected to reach a sensing value, the obstacle detection sensor transmits an obtained signal to the controller 12, the controller 12 controls the upward ejecting device 13 to operate after analysis, the distance detection sensor in the upward ejecting device 13 is started firstly during operation, the initial height is detected, the placing height of the punch 111 and the material in the press-fitting die 142 is measured, and the distance cannot be started when the distance is smaller than a set value, the unsafe factors between the punch 111 and the press-fitting die 142, such as interference of other objects or manual operation, are avoided, if the unsafe factors are in a set value, the controller 12 controls the punch 111 to press downwards so as to press the blank, and after the jacking device 13 senses impact, the obstacle detection sensor feeds back a signal to the controller 12 so as to control the jacking head 131 to jack out, so that automatic demoulding of the blank is realized.
The pushing-out device 15 is arranged in the machine body 1, the pushing-out device 15 is fixed in the first mounting seat 151, the first mounting seat 151 is fixed on the inner wall of the pressing machine, the pushing-out device 15 comprises a third driving motor, the third driving motor is connected to the controller 12, a toothed cylinder 152 is sleeved at the rotating shaft end of the third driving mechanism, the toothed cylinder 152 is used for driving a toothed belt 154 meshed on two rotating shafts 153, the rotating shafts 153 are connected in second mounting seats 155 at two ends of the pushing-out device 15 through shafts, the toothed belt 154 rotates circularly under the driving of the rotating shafts 153, a side gear of the toothed belt 154 is connected with a sliding block 156, the sliding block 156 is clamped in a first slideway 157 of the pushing-out mechanism, so that the sliding block 156 moves back and forth on one side of the toothed belt 154 under the driving of the toothed belt 154, the sliding block 156 is connected to one end of a pushing-out rod 158, the other end of the pushing-out rod 158 is connected with a material discharging box 16, the material discharging box 16 is clamped in a second slideway 143 of the die mounting seat 14 through a limiting block, a force sensor is arranged in the limiting block, the force sensor is connected with the controller 12, the material receiving box 16 is driven by the sliding block 156 to slide back and forth in the second slide way 143, so that the blank is pushed out of the machine body 1, after demoulding is completed, the blank is pushed to the same horizontal height as the die mounting seat 14, the obstacle detection sensor transmits a push-out signal to the controller 12, the controller 12 controls the third driving motor of the push-out device 15 to operate after data analysis, so that the toothed belt 154 rotates around the rotating shaft 153 under the drive of the toothed cylinder 152 and drives the sliding block 156 to move forward in the first slide way, the push-out rod 158 drives the material receiving box 16 to push forward under the action of the second slide way 143, so that the blank is pushed into the placed material basket, the limiting block is arranged at the bottom of the material receiving box 16 and can limit the push-out distance of the material receiving box 16, and the force of the limiting block can be applied to return when the material receiving box 16 is pushed out, the generated force feeds back the stress signal to the controller 12 through a stress sensor arranged in the limiting block, so that the third driving motor is controlled to rotate reversely, and the material discharging box 16 is pushed back.
The top end of the material placing box 16 is provided with a feeding hole, the bottom end of the material placing box 16 is provided with a plurality of discharging holes, the feeding hole is connected with a pipeline, the other end of the pipeline is connected with the discharging holes of the feeding device 17, the feeding device 17 is a top plate embedded in a pressing machine, the particles prepared in the step (4) are poured into the feeding device 17 and fall into the material placing box 16 through the pipeline, the material placing box 16 is pushed to the press-fitting die 142 under the driving of the slider 156, the particles in the material placing box 16 fall into the press-fitting die 142 through the discharging holes, so that automatic feeding is realized, the feeding hole at the top end of the material placing box 16 is connected with the feeding device 17 through the pipeline, automatic feeding can be realized as soon as the material in the material placing box 16 is reduced, the plurality of discharging holes are formed at the bottom end of the material placing box, and the blank can be automatically fed into the press-fitting die 142 after the material pushing box pushes out, so that automatic feeding is realized.
The implementation principle of the novel automatic pressing machine in the embodiment is as follows: the material to be pressed is poured into the feeding device 17, the material can fall into the discharging box 16 from the feeding hole of the discharging box 16 along a pipeline, when the obstacle detection sensor in the upper jacking device 13 detects that no material exists in the press-fitting mold 142, the information can be fed back to the controller 12, the controller 12 controls the operation of a third driving motor in the pushing device 15, so that the discharging box 16 is pushed forward under the driving of the sliding block 156, in the pushing process, the material can fall into the press-fitting mold 142 from a plurality of discharging holes in the bottom end of the discharging box 16, and automatic feeding is realized, the pushing distance of the discharging box 16 can be limited by the arrangement of the limiting block, the discharging box 16 can be subjected to a backward force under the action of the limiting block when being pushed out, the generated force feeds back a stress signal to the controller 12 through a stress sensor arranged in the limiting block, so that the third driving motor is controlled to rotate reversely, and the discharging box 16 is pushed back, when an obstacle detection sensor in the upper jacking device 13 detects that the material in the press-fitting die 142 reaches an induction value, a signal is transmitted to the controller 12, the controller 12 controls a distance sensor of the punching device 11 to start, detects the distance from the jacking head 131 to the press-fitting die 142, if the distance does not reach the induction value, the signal is fed back to the controller 12, the controller 12 controls the pushing device 15 to push out again, after the distance sensor detects a distance value in a specified range, the first driving motor is driven to operate under the control of the controller 12, so that blanks are manufactured through automatic punching, if the distance value exceeds or is lower than the distance value, the punch 111 is not controlled to punch, so that the blank quality is not over, or the machine is damaged, or people are prevented from being injured when the upper jacking device 13 is punched, the obstacle detection sensor feeds back a signal to the controller 12, the ejector 131 is controlled to eject, so that automatic demolding of the blank is realized, after demolding is completed, the blank can be ejected to the same horizontal height as the die mounting seat 14, the obstacle detection sensor transmits an ejection signal to the controller 12, the controller 12 controls the ejection device 15, the material discharge box 16 is ejected, the blank is ejected to the material placing frame, and therefore automatic and efficient blank pressing is realized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A preparation process of a silver tin oxide electrical contact material is characterized by comprising the following steps: the silver tin oxide electrical contact material comprises the following components in percentage by mass: 92-80%, tin oxide (SnO 2): 4-17%, niobium pentoxide (Nb2O 5): 0.1-4%, tantalum pentoxide (Ta2O 5): 0.1-4%; after ball milling, carrying out reduction and diffusion on tin oxide powder, tantalum pentoxide powder and niobium pentoxide powder under hydrogen, calcining at high temperature in air, and crushing to obtain tin-tantalum-niobium composite oxide powder; the preparation process specifically comprises the following steps: (1) adding niobium pentoxide powder and tantalum pentoxide powder into tin oxide powder, ball-milling for 24 hours, keeping the temperature in a hydrogen annealing furnace at 700 ℃ for 2 hours, keeping the temperature in air atmosphere for 3 hours, crushing, and sieving with a 325-mesh sieve to prepare tin-tantalum-niobium composite oxide powder; (2) mixing the tin-tantalum-niobium composite oxide powder prepared in the step (1) with silver powder for 4 hours, and ball-milling for 12 hours after the mixing is finished; (3) pressing: pressing the powder particles into blanks by a pressing machine, wherein the size specification is 5.0mm in diameter and 1.0mm in thickness; (4) and (3) sintering: sintering in air for 4 hours at 900 ℃; (5) repressing: the dimensions of the contacts were finished, with dimensions of 5.0mm diameter and 0.89mm (6) thickness: detecting the density, hardness, conductivity, metallographic phase and electrical property; the pressing machine comprises a machine body (1), wherein a lower pressing device (11) is installed on an upper cover plate in the machine body (1), a first driving motor and a distance detection sensor are arranged in the lower pressing device (11), the first driving motor is used for driving a punch (111) on the lower pressing device to perform lower pressing movement, the first driving motor and the distance detection sensor are both connected with a controller (12), the controller (12) is installed in the machine body (1), the controller (12) is powered by an electric cabinet box (2) installed outside the machine body (1), an upper jacking device (13) is installed on the lower cover plate of the machine body (1) relative to the lower pressing device, a second driving motor and an obstacle detection sensor are arranged in the upper jacking device (13), and the second driving motor and the obstacle detection sensor are both connected with the controller (12), the ejection head (131) on the upper ejection device (13) is driven by the second driving motor to eject upwards, the surface of the upper ejection device (13) is connected with a die mounting seat (14), a cavity (141) is formed in the die mounting seat (14), a press-fitting die (142) is mounted in the cavity (141), powder particles are placed in the press-fitting die (142), a blank is punched under the downward punching motion of the punch (111), and the blank is ejected under the upward ejecting motion of the ejection head (131); the pushing device (15) is arranged in the machine body (1), the pushing device (15) is fixed in a first mounting seat (151), the first mounting seat (151) is fixed on the inner wall of the pressing machine, the pushing device (15) comprises a third driving motor, the third driving motor is connected to a controller (12), a rotating shaft end of the third driving motor is sleeved with a toothed cylinder (152), the toothed cylinder (152) is used for driving toothed belts (154) meshed with two rotating shafts (153), the rotating shafts (153) are connected in second mounting seats (155) at two ends of the pushing device (15) in a shaft connecting mode, the toothed belts (154) rotate in an annular mode under the driving of the rotating shafts (153), one side of each toothed belt (154) is connected with a sliding block (156), and each sliding block (156) is clamped in a first sliding way (157) of the pushing device, the slider (156) is driven by the toothed belt (154) to move back and forth on one side of the toothed belt (154), the slider (156) is connected to one end of an ejection rod (158), the other end of the ejection rod (158) is connected with a material placing box (16), the material placing box (16) is clamped in a second slide way (143) of the die mounting seat (14) through a limiting block, a stress sensor is arranged in the limiting block and connected with the controller (12), and the material placing box (16) is driven by the slider (156) to slide back and forth in the second slide way (143), so that a blank is ejected out of the machine body (1); the top of putting magazine (16) is opened there is the feed inlet, open the bottom of putting magazine (16) has a plurality of discharge gates, the feed inlet is connected with the pipeline, the other end of pipeline is connected in the discharge gate of feed arrangement (17), feed arrangement (17) be embedded in the roof of briquetting machine, in feed arrangement (17) was poured into to the powder granule, via the pipeline falls into in putting magazine (16), put magazine (16) be in push down to under the drive of slider (156) on pressure equipment mould (142), the powder granule in putting magazine (16) passes through the discharge gate falls into in pressure equipment mould (142) to realize automatic material conveying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011605269.4A CN112760513B (en) | 2020-12-30 | 2020-12-30 | Silver tin oxide electrical contact material and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011605269.4A CN112760513B (en) | 2020-12-30 | 2020-12-30 | Silver tin oxide electrical contact material and preparation process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112760513A CN112760513A (en) | 2021-05-07 |
| CN112760513B true CN112760513B (en) | 2022-04-15 |
Family
ID=75697354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011605269.4A Active CN112760513B (en) | 2020-12-30 | 2020-12-30 | Silver tin oxide electrical contact material and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112760513B (en) |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0152606B1 (en) * | 1984-01-30 | 1987-09-09 | Siemens Aktiengesellschaft | Contact material and production of electric contacts |
| JPH0896643A (en) * | 1994-09-28 | 1996-04-12 | Matsushita Electric Works Ltd | Electric contact point material |
| DE19543222C1 (en) * | 1995-11-20 | 1997-02-20 | Degussa | Silver@-iron material contg. oxide additives |
| CN101241804B (en) * | 2007-11-23 | 2010-04-21 | 中南大学 | A silver-ZnO electric contact and its making method |
| CN201177151Y (en) * | 2008-03-13 | 2009-01-07 | 苏州托克斯冲压设备有限公司 | Small-sized single machine stamping equipment security device |
| JP5342931B2 (en) * | 2009-06-05 | 2013-11-13 | マブチモーター株式会社 | Sliding contact material, clad composite material and motor |
| CN102290261B (en) * | 2011-05-27 | 2014-04-09 | 张树堂 | Silver copper based metal oxide electrical contact material containing adding elements and preparation method thereof |
| CN103276234B (en) * | 2013-06-14 | 2015-07-08 | 西安工程大学 | Preparation method of silver tin oxide electrical contact material |
| CN204366034U (en) * | 2014-12-25 | 2015-06-03 | 江西宏科特种合金有限公司 | For the semi-automatic press of alloy addition |
| CN105374598A (en) * | 2015-11-05 | 2016-03-02 | 福达合金材料股份有限公司 | Manufacturing method for coarse oxide particle silver-based electric contact materials |
| CN106057526A (en) * | 2016-06-27 | 2016-10-26 | 温州中希电工合金有限公司 | Laminated silver-copper-brazing-filler-metal three-composite electrical contact material manufactured by coating and sleeving method and manufacturing method thereof |
| CN205798438U (en) * | 2016-07-18 | 2016-12-14 | 安徽奥泰粉末冶金有限公司 | A kind of Full-automatic powder metallurgy formation punching machine |
| US10290434B2 (en) * | 2016-09-23 | 2019-05-14 | Honeywell International Inc. | Silver metal oxide alloy and method of making |
| CN208450603U (en) * | 2018-06-29 | 2019-02-01 | 河南飞孟金刚石工业有限公司 | A kind of pressure setting of automatic loading/unloading |
| CN109252064B (en) * | 2018-10-15 | 2020-05-22 | 浙江工业大学 | Doped modified Ag/SnO2Composite electric contact material and preparation method thereof |
| CN110499435B (en) * | 2019-09-20 | 2021-07-09 | 昆明贵金属研究所 | Silver-based electric contact material and preparation method thereof |
| CN111834135B (en) * | 2020-07-15 | 2022-08-09 | 安徽工业大学 | MAX @ MOm/AOn electrical contact enhanced phase material, composite electrical contact material and preparation method |
-
2020
- 2020-12-30 CN CN202011605269.4A patent/CN112760513B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112760513A (en) | 2021-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3954459A (en) | Method for making sintered silver-metal oxide electric contact material | |
| CN101944441B (en) | Silver zinc oxide electric contact material and preparation method thereof | |
| CN112760513B (en) | Silver tin oxide electrical contact material and preparation process thereof | |
| US4452652A (en) | Electrical contact materials and their production method | |
| CN112831681B (en) | Powder metallurgy method silver cadmium oxide electrical contact material and manufacturing process thereof | |
| CN109593981B (en) | Preparation method of silver tin oxide contact material for improving sintering property of ingot blank | |
| KR20160062411A (en) | METHOD FOR PREPARING OF Ag-OXIDE BASED ELECTRICAL CONTACT MATERIAL FOR ELECTRIC SWITCH | |
| CN209349379U (en) | It is a kind of precision hardware production use stamping die | |
| CN202683846U (en) | Automatic cold-punching, extruding and forming device of T-shaped nut | |
| CN112151291B (en) | Silver metal oxide electric contact material with long service life and preparation method thereof | |
| CN109500392B (en) | Preparation method of silver zinc oxide contact material for improving sintering property of ingot blank | |
| CN1278015A (en) | Electric contact material alloy based on silver-titanium and prodn. process therefor | |
| CN210435821U (en) | Scrap iron cleaning device of round steel cutting machine | |
| CN112768263A (en) | Silver oxide indium oxide electrical contact and production process thereof | |
| CN112853140A (en) | Silver oxide indium oxide electrical contact and production process thereof | |
| CN112536383A (en) | Energy-concerving and environment-protective automatic punch press mould device of collecting waste material | |
| CN219233772U (en) | Terminal precision small hole stamping die | |
| CN116833356B (en) | Novel forging die for transmission shaft sliding fork forge piece | |
| CN104637711B (en) | A kind of rivet contacts processing technology | |
| CN111531099A (en) | Composite sheet cold heading equipment | |
| CN218975397U (en) | Novel eutectic machine | |
| CN219113509U (en) | Metal flake cutting tool | |
| CN117139627B (en) | Hard alloy sealing ring and preparation method and preparation device thereof | |
| CN213070909U (en) | Can effectively prevent being stained with inductance stitch hot pressing welding mechanism of line | |
| CN218946088U (en) | Uninterrupted continuous stamping mechanism for processing electronic connector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |