CN113737049A - Silver-platinum bonding wire with high platinum-containing metal and preparation method thereof - Google Patents

Abstract

The invention discloses a silver-platinum bonding wire with high platinum-containing metal content and a preparation method thereof, relating to the technical field of bonding wire materials and comprising 85-99% of silver, 15-5% of platinum, 0.1-0.2% of copper, 0.2-0.35% of calcium, 0.003-0.01% of chromium and 0.01-0.02% of other doping elements by mass percent. The invention can avoid the damage of the inner atmosphere of the upper heating chamber and the lower heating chamber, can also avoid the gas waste, can preheat silver, copper, chromium and iridium and silver, calcium and lanthanum in the subsequent silver-platinum alloy preparation process, and can preheat silver, calcium and lanthanum for the second time in the silver-copper-chromium alloy preparation process, thereby effectively shortening the time required by the silver-copper-chromium alloy and the silver-calcium alloy preparation and improving the processing efficiency.

Description

Silver-platinum bonding wire with high platinum-containing metal and preparation method thereof

Technical Field

The invention relates to the technical field of bonding wire materials, in particular to a silver-platinum bonding wire with high platinum-containing metal and a preparation method thereof.

Background

The bonding alloy material is widely applied to the integrated circuit packaging industry and the LED industry due to excellent chemical stability, the development of the bonding gold wire material tends to be the limit after years of research and development, at present, the alloy wire material with excellent performance and low price becomes the research and development trend, the cost of the silver wire is lower than that of the gold wire, and the bonding process does not need protective gas, so the silver wire becomes another bonding wire material which replaces the gold wire besides the copper wire, and the copper and silver bonding materials gradually replace the gold bonding material along with the development of high density, high speed and miniaturization of electronic packaging.

An issued patent application publication No. CN 111593223B discloses a silver-platinum bonding wire material with high platinum-containing metal and a preparation process thereof. The components of the silver-platinum bonding wire material comprise silver, platinum, copper, calcium, chromium and other doping elements of indium, lanthanum and iridium; the adoption of silver metal and platinum metal is beneficial to enhancing the strength and the elongation of the wire, the tensile force and the thrust force can meet corresponding requirements, and the wire has excellent welding performance and mechanical performance.

In view of the above-mentioned processes, those skilled in the art will think of completing the preparation of silver-platinum alloy, silver-copper-chromium alloy and silver-calcium alloy with one apparatus in order to reduce the equipment cost, but those skilled in the art will find some disadvantages when completing the above-mentioned preparation operations using a single heating furnace:

it is comparatively obvious that at the in-process of ejection of compact for the first time, the feeding for the second time, the ejection of compact for the second time, the feeding for the third time and the ejection of compact for the third time, all can cause the destruction to the gas atmosphere in the furnace body, and then lead to follow-up need to make the gas atmosphere in the furnace body again, simultaneously owing to adopt the mode of successively feeding to process, consequently the raw materials metal of secondary operation and the raw materials of processing for the third time all need the longer time to preheat the back, just can accomplish the founding operation, whole process time is longer.

Therefore, it is necessary to invent a silver-platinum bonding wire with high platinum-containing metal and a preparation method thereof to solve the above problems.

Disclosure of Invention

The invention aims to provide a silver-platinum bonding wire with high platinum-containing metal and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a silver-platinum bonding wire with high platinum-containing metal comprises, by mass, 85-99% of silver, 15-5% of platinum, 0.1-0.2% of copper, 0.2-0.35% of calcium, 0.003-0.01% of chromium and 0.01-0.02% of other doping elements;

the other doping elements comprise 0.004-0.008% of indium, 0.004-0.008% of lanthanum and 0.003-0.009% of iridium.

Preferably, the preparation method is realized by using preparation equipment, the preparation equipment comprises a heating furnace, two sealing components are arranged in the heating furnace, a first driving mechanism is arranged at the rear side of the heating furnace and is used for driving the sealing plates in the two sealing components to be closed or opened respectively, a second driving mechanism is fixedly arranged at the top of the heating furnace, a crucible bearing mechanism is arranged in the middle of an inner cavity of the heating furnace and is arranged on the second driving mechanism in a lifting manner, a seal releasing component is arranged at the bottom of the inner cavity of the heating furnace, a third bevel gear in the second driving mechanism drives a second reciprocating screw rod in the seal releasing component to drive an insertion rod to move left or right, the insertion rod in the seal releasing component pulls a sealing plate in the crucible bearing mechanism after entering a linkage hole in the crucible bearing mechanism, make the closing plate among the crucible bearing mechanism remove the sealing of bearing the seat in bearing the mechanism to the crucible, the equal fixedly connected with exhaust mechanism in heating furnace right side and both sides behind one's back is located the right side exhaust mechanism carries out the evacuation to business turn over material cavity in the heating furnace, is located the heating furnace left behind one's back exhaust mechanism with inside argon input of business turn over material cavity in the heating furnace under the heating chamber inside, be located the heating furnace right behind one's back exhaust mechanism with inside hydrogen input of business turn over material cavity in the heating furnace heating chamber inside.

Preferably, the heating furnace includes furnace body, sealing door, goes up heating cavity, business turn over material cavity and lower heating cavity, the sealing door passes through hinge swing joint in the positive middle part of furnace body, go up heating cavity, business turn over material cavity and lower heating cavity from top to bottom set up inside the furnace body, it all is provided with the heating pipe with heating cavity inside down to go up the heating cavity, it has hydrogen to go up the inside packing of heating cavity, the inside packing of heating cavity has argon gas, two down the seal assembly is located respectively between heating cavity and the business turn over material cavity and between business turn over material cavity and the lower heating cavity, the sealing door is located business turn over material cavity openly.

Preferably, the sealing assembly comprises two groups of sealing mechanisms which are identical in structure and symmetrically arranged, each sealing mechanism comprises a sealing plate, a guide frame, a first connecting rod, a first spring, a connecting plate, a first reciprocating screw rod, a transmission rod, a first bevel gear and a first fixing plate, the guide frames are arranged on the outer side of the sealing plate in a sliding sleeved mode, the guide frames are fixedly nested on the outer wall of the furnace body, the first connecting rods are fixedly arranged at the outer end of the sealing plate, the first springs and the connecting plates are both arranged on the outer side of the first connecting rods in a sliding sleeved mode, one end of each first spring is fixedly connected with the sealing plate, the other end of each first spring is fixedly connected with the connecting plate, the first reciprocating screw rods penetrate through the connecting plates and are in threaded connection with the connecting plates, the transmission rods are arranged at the inner ends of the first reciprocating screw rods in a transmission mode through overrunning clutches, the first bevel gears are fixedly arranged at the inner ends of the transmission rods, the first fixing plate is rotatably sleeved outside the transmission rod through a bearing and is fixedly connected with the furnace body;

the first driving mechanism comprises a first motor, a rotating shaft and two second bevel gears, the first motor is fixedly arranged at the top of the rear side of the furnace body, the rotating shaft is in transmission arrangement with the bottom of the first motor, the two second bevel gears are arranged in two, the two second bevel gears are fixedly sleeved and arranged on the outer side of the rotating shaft, and the two second bevel gears are respectively meshed with four first bevel gears in four groups of sealing mechanisms in the two sealing assemblies.

Preferably, the second driving mechanism comprises a second motor, a screw rod and a third bevel gear, the second motor is fixedly arranged at the top of the furnace body, the screw rod is positioned in the furnace body, the top end of the screw rod is in transmission connection with the screw rod, and the third bevel gear is fixedly sleeved at the bottom of the outer side of the screw rod;

the crucible bearing mechanism comprises a bearing disc, bearing seats, mounting plates, second springs, sealing plates and linkage holes, the bearing disc is sleeved on the outer side of a screw rod and is in threaded connection with the screw rod, guide rods penetrate through the rear side of the top of the bearing disc in a sliding mode in the vertical direction, two ends of each guide rod are fixedly connected with the inner wall of a furnace body, the number of the bearing seats is three, the three bearing seats are respectively fixedly nested on two sides of the top of the bearing disc and on the front side of the top, the number of the mounting plates, the number of the second springs and the number of the sealing plates are two, the two mounting plates are respectively fixedly arranged on the bearing seats on two sides, the two sealing plates are respectively placed on the tops of the two bearing seats, one end of each second spring is fixedly connected with the mounting plate, and the other end of each second spring is fixedly connected with the corresponding sealing plate;

the seal removing assembly comprises two groups of removing mechanisms which have the same structure and are symmetrically arranged, the removing mechanisms comprise a second fixing plate, a second reciprocating screw rod, a fourth bevel gear, a sliding block, a third spring, a second connecting rod and an inserting rod, the second fixing plate is fixedly connected with the inner wall of the lower heating chamber, the second reciprocating screw rod penetrates through the second fixing plate in the horizontal direction and is rotatably connected with the second fixing plate through a bearing, the fourth bevel gear is fixedly arranged at the inner end of the second reciprocating screw rod, the slide block is sleeved at the outer side of the second reciprocating screw rod and is in threaded connection with the second reciprocating screw rod, the third spring and the second connecting rod are sleeved outside the second reciprocating screw rod in a sliding manner, the left end of the third spring is fixedly connected with the sliding block, and the right end is fixedly connected with the second connecting rod, and the inserting rod is fixedly arranged at the top of the second connecting rod.

Preferably, exhaust mechanism includes blast pipe and air pump, be provided with the check valve on the blast pipe, the air pump sets up on the blast pipe, is located in the exhaust mechanism on right side the blast pipe runs through the furnace body outer wall and extends to inside the business turn over material cavity, is located in left exhaust mechanism behind one's back the blast pipe both ends all run through the furnace body outer wall and extend to business turn over material cavity and heat the cavity down inside respectively, are located in the exhaust mechanism on right side behind one's back the blast pipe both ends all run through the furnace body outer wall and extend to inside business turn over material cavity and the last heating cavity respectively.

Preferably, the preparation equipment further comprises a sealing reinforcing mechanism, the sealing reinforcing mechanism is fixedly arranged at the top of the inner cavity of the heating furnace, the sealing reinforcing mechanism comprises an annular pressing plate and two springs, the annular pressing plate is sleeved and arranged outside the screw rod and located above the two sealing plates, the four springs are arranged and two of the four springs are respectively fixedly connected to two sides of the top of the annular pressing plate and two of the top of the four springs are fixedly connected with the inner wall of the upper heating cavity.

Preferably, the preparation method specifically comprises the following steps:

s1, cleaning the metal raw material, and drying for later use after cleaning;

s2, opening the sealing door, putting the crucible with the silver, platinum and indium in the bearing seat on the front side, putting the crucible with the silver, copper, chromium and iridium in the bearing seat on the left side, putting the crucible with the silver, calcium and lanthanum in the mounting plate on the right side, closing the sealing door, simultaneously enabling the air pump in the right side exhaust mechanism to work, and vacuumizing the interior of the feeding and discharging chamber;

s3, enabling a first motor to drive a rotating shaft to rotate forwards, enabling the rotating shaft to drive two first reciprocating screw rods positioned above to rotate through a second bevel gear due to the limitation of an overrunning clutch, further enabling the first reciprocating screw rods to drive two closing plates positioned above to open through a connecting plate, a first spring and a first connecting rod, enabling hydrogen in an upper heating chamber to enter the feeding and discharging chamber at the moment, enabling a second motor to drive the screw rods to rotate forwards, further enabling the screw rods to drive a crucible bearing mechanism to integrally enter the upper heating chamber, then starting a heating pipe in the upper heating chamber, and raising the temperature of the upper heating chamber and the temperature of the feeding and discharging chamber to 1170-1200 ℃ through the heating pipe, wherein at the moment, silver, platinum and indium in a crucible in a front bearing seat are completely melted, silver, copper, chromium and iridium in a crucible in a left bearing seat and silver, chromium and iridium in a crucible in a right bearing seat are completely melted, Calcium and lanthanum are preheated;

s4, enabling the second motor to drive the screw rod to rotate reversely, enabling the crucible bearing mechanism to move to the inside of the feeding and discharging chamber from the inside of the upper heating chamber again, enabling the first motor to drive the rotating shaft to rotate forwardly, enabling the two sealing plates located above to be folded, blocking the upper heating chamber and the feeding and discharging chamber, inputting hydrogen in the feeding and discharging chamber into the upper heating chamber by using an air pump in an exhaust mechanism on the left side behind the heating furnace, enabling a technician to open the sealing door at the moment, taking out the crucible in the front bearing seat, performing water-cooling pouring to obtain a silver-platinum alloy, finally closing the sealing door, enabling an air pump in the right exhaust mechanism to work again, and performing vacuum pumping treatment on the inside of the feeding and discharging chamber;

s5, the first motor continues to drive the rotation shaft to rotate reversely, due to the limitation of the overrunning clutch, the rotation shaft drives the two first reciprocating screw rods positioned below to rotate through the second bevel gear, so that the first reciprocating screw rods drive the two sealing plates positioned below to open through the connecting plate, the first spring and the first connecting rod, at the moment, argon in the lower heating chamber enters the feeding and discharging chamber, so that the second motor drives the screw rods to continue to rotate reversely, so that the whole crucible bearing mechanism descends to the inside of the lower heating chamber from the inside of the feeding and discharging chamber, in the descending process of the crucible bearing mechanism, the linkage holes in the sealing plate are sleeved outside the insertion rods, meanwhile, when the screw rods rotate, the screw rods drive the second reciprocating screw rods to rotate through the third bevel gears and the fourth bevel gears, so that the sliding blocks drive the insertion rods to move towards the direction far away from the screw rods through the third spring and the second connecting rod, the inserting rod transversely pulls the sealing plates at the moment, so that the second spring extends, the sealing of the two bearing seats is relieved by the two sealing plates at the moment, the obtained metal in the two crucibles can be in contact with argon gas, then the heating pipe in the lower heating chamber is started, the heating pipe raises the temperature of the lower heating chamber and the temperature of the interior of the feeding and discharging chamber to 1700-1850 ℃, at the moment, the silver, the copper, the chromium and the iridium in the crucible in the bearing seat on the left side are completely melted, and the silver, the calcium and the lanthanum in the crucible in the bearing seat on the right side are secondarily preheated;

s6, enabling the second motor to drive the screw rod to rotate in the forward direction, enabling the whole crucible bearing mechanism to move from the interior of the lower heating chamber to the interior of the feeding and discharging chamber again, enabling the first motor to drive the rotating shaft to rotate reversely, enabling the two sealing plates located below to be folded, blocking the lower heating chamber and the feeding and discharging chamber, inputting argon gas in the feeding and discharging chamber into the lower heating chamber by using a gas pump in an exhaust mechanism on the rear right side of the heating furnace, enabling a technician to open the sealing door at the moment, taking out the crucible in the bearing seat on the left side, performing water-cooling pouring to obtain silver-copper-chromium alloy, finally closing the sealing door, enabling a gas pump in the exhaust mechanism on the right side to work again, and performing vacuum pumping treatment on the interior of the feeding and discharging chamber;

s7, repeating the step S5, so that the whole crucible bearing mechanism enters the lower heating chamber from the inside of the feeding and discharging chamber, meanwhile, argon in the lower heating chamber enters the inside of the feeding and discharging chamber, then the heating pipe raises the temperature of the lower heating chamber and the inside of the feeding and discharging chamber to 2650-2830 ℃, and at the moment, silver, calcium and lanthanum in the crucible in the right bearing seat are completely melted;

s8, repeating the step S6, enabling the crucible bearing mechanism to move from the lower heating chamber to the interior of the feeding and discharging chamber, enabling the two sealing plates located below to be folded, then utilizing the exhaust mechanism on the right side of the back of the heating furnace to convey argon back into the feeding and discharging chamber, enabling technicians to open the sealing door, then taking out the crucible in the bearing seat on the right side, performing water-cooling pouring to obtain silver-calcium alloy, and finally closing the sealing door;

s9, carrying out vacuum continuous casting process on the silver-platinum alloy, the silver-copper-chromium alloy and the silver-calcium alloy at 2240-.

The invention has the technical effects and advantages that:

the invention is provided with the sealing components, the crucible bearing mechanism and the three groups of exhaust mechanisms, so that the two groups of sealing components are utilized to separate the upper heating chamber from the feeding and discharging chamber and the lower heating chamber from the feeding and discharging chamber, further the damage to the gas atmosphere in the upper heating chamber and the lower heating chamber during feeding is avoided, the arrangement of the sealing plate in the crucible bearing mechanism can avoid the contact of silver, copper, chromium and iridium and silver, calcium and lanthanum with argon during preheating, the three groups of exhaust mechanisms can respectively evacuate the feeding and discharging chambers, and recycle the hydrogen and the argon, further the damage to the atmosphere in the upper heating chamber and the lower heating chamber is avoided, and the waste of gas can be avoided, in addition, after the single complete feeding, the silver, copper, chromium, iridium and silver can be subjected to the subsequent silver-platinum alloy preparation process, Calcium and lanthanum are preheated, silver, calcium and lanthanum can be preheated for the second time in the process of preparing the silver-copper-chromium alloy, so that the time required by preparing the silver-copper-chromium alloy and the silver-calcium alloy is effectively shortened, and the processing efficiency is improved.

Drawings

Fig. 1 is a schematic overall front view structure of the present invention.

Fig. 2 is an overall front sectional structural view of the present invention.

Fig. 3 is an overall rear view structure diagram of the present invention.

FIG. 4 is a schematic front view of the crucible carrying mechanism of the present invention.

FIG. 5 is a schematic top view of the crucible supporting mechanism of the present invention.

Fig. 6 is a front view of the seal releasing mechanism of the present invention.

FIG. 7 is a schematic process flow diagram of the present invention.

In the figure: 1. heating furnace; 11. a furnace body; 12. a sealing door; 13. an upper heating chamber; 14. a feeding and discharging chamber; 15. a lower heating chamber; 2. a closure assembly; 21. a closing plate; 22. a guide frame; 23. a first connecting rod; 24. a first spring; 25. a connecting plate; 26. a first reciprocating screw rod; 27. a transmission rod; 28. a first bevel gear; 29. a first fixing plate; 3. a first drive mechanism; 31. a first motor; 32. a rotating shaft; 33. a second bevel gear; 4. a second drive mechanism; 41. a second motor; 42. a screw rod; 43. a third bevel gear; 5. a crucible carrying mechanism; 51. a carrier tray; 52. a bearing seat; 53. mounting a plate; 54. a second spring; 55. a sealing plate; 56. a linkage hole; 6. a seal-release assembly; 61. a second fixing plate; 62. a second reciprocating screw rod; 63. a fourth bevel gear; 64. a slider; 65. a third spring; 66. a second connecting rod; 67. an insertion rod; 7. an exhaust mechanism; 71. an exhaust pipe; 72. an air pump; 8. a seal reinforcement mechanism; 81. an annular pressure plate; 82. and a fourth spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The invention provides a silver-platinum bonding wire with high platinum-containing metal, which comprises 85-99% of silver, 15-5% of platinum, 0.1-0.2% of copper, 0.2-0.35% of calcium, 0.003-0.01% of chromium and 0.01-0.02% of other doping elements by mass percent;

the other doping elements comprise 0.004-0.008% of indium, 0.004-0.008% of lanthanum and 0.003-0.009% of iridium.

As shown in fig. 1-6, the preparation method is implemented by using preparation equipment, the preparation equipment includes a heating furnace 1, two sealing assemblies 2 are arranged inside the heating furnace 1, a first driving mechanism 3 is arranged at the rear side of the heating furnace 1, the first driving mechanism 3 drives the sealing plates 21 in the two sealing assemblies 2 to close or open respectively, a second driving mechanism 4 is fixedly arranged at the top of the heating furnace 1, a crucible carrying mechanism 5 is arranged in the middle of the inner cavity of the heating furnace 1, the crucible carrying mechanism 5 is arranged on the second driving mechanism 4 in a lifting manner, a seal releasing assembly 6 is arranged at the bottom of the inner cavity of the heating furnace 1, a third bevel gear 43 in the second driving mechanism 4 drives a second reciprocating screw 62 in the seal releasing assembly 6 to drive an insertion rod 67 to move left or right, after the insertion rod 67 in the seal releasing assembly 6 enters a linkage hole 56 in the crucible carrying mechanism 5, draw the closing plate 55 in the crucible bearing mechanism 5 for closing plate 55 in the crucible bearing mechanism 5 removes the sealed of bearing seat 52 in the crucible bearing mechanism 5, the equal fixedly connected with exhaust mechanism 7 in both sides behind and on the right side of heating furnace 1 exhaust mechanism 7 carries out the evacuation to business turn over material cavity 14 in to heating furnace 1, is located heating furnace 1 left behind it is inside business turn over material cavity 14 inside argon gas input heating furnace 1 in business turn over material cavity 15 in with heating furnace 1 that exhaust mechanism 7 will be in heating furnace 1, is located heating furnace 1 right side behind it the back exhaust mechanism 7 inputs heating furnace 1 in business turn over material cavity 14 inside hydrogen inside heating furnace 13 inside.

As shown in fig. 2, the heating furnace 1 includes a furnace body 11, a sealing door 12, an upper heating chamber 13, a charging and discharging chamber 14, and a lower heating chamber 15.

More specifically, sealing door 12 passes through hinge swing joint in furnace body 11 positive middle part, it sets up inside furnace body 11 from top to bottom to go up heating cavity 13, business turn over material cavity 14 and lower heating cavity 15, it all is provided with the heating pipe with heating cavity 15 inside down to go up heating cavity 13, it has hydrogen to go up the inside packing of heating cavity 13, 15 inside packings of lower heating cavity have argon gas, two the seal assembly 2 is located respectively between heating cavity 13 and the business turn over material cavity 14 and between business turn over material cavity 14 and the lower heating cavity 15, sealing door 12 is located business turn over material cavity 14 openly to during the in-service use, can open sealing door 12, then add the raw materials into business turn over material cavity 14 inside.

As shown in fig. 2 and 3, the closing assembly 2 includes two sets of closing mechanisms with the same structure and arranged symmetrically, and the closing mechanisms include a closing plate 21, a guide frame 22, a first connecting rod 23, a first spring 24, a connecting plate 25, a first reciprocating screw rod 26, a transmission rod 27, a first bevel gear 28 and a first fixing plate 29.

More specifically, the guide frame 22 is slidably sleeved on the outer side of the sealing plate 21, the guide frame 22 is fixedly nested on the outer wall of the furnace body 11, the first connecting rod 23 is fixedly arranged at the outer end of the sealing plate 21, the first spring 24 and the connecting plate 25 are both slidably sleeved on the outer side of the first connecting rod 23, one end of the first spring 24 is fixedly connected with the sealing plate 21 and the other end is fixedly connected with the connecting plate 25, the first reciprocating screw rod 26 penetrates through the connecting plate 25 and is in threaded connection with the connecting plate 25, the transmission rod 27 is arranged at the inner end of the first reciprocating screw rod 26 through transmission of an overrunning clutch, the first bevel gear 28 is fixedly arranged at the inner end of the transmission rod 27, the first fixing plate 29 is rotatably sleeved on the outer side of the transmission rod 27 through a bearing and is fixedly connected with the furnace body 11, so that the two sealing plates 21 above are opened, and hydrogen in the upper heating chamber 13 enters the feeding and discharging chamber 14, or the two lower closing plates 21 are opened, so that argon in the lower heating chamber 15 enters the feeding and discharging chamber 14, meanwhile, after the two upper closing plates 21 are opened, the crucible bearing mechanism 5 can enter the upper heating chamber 13 from the feeding and discharging chamber 14, and after the two lower closing plates 21 are opened, the crucible bearing mechanism 5 can enter the lower heating chamber 15 from the feeding and discharging chamber 14.

As shown in fig. 3, the first drive mechanism 3 includes a first motor 31, a rotary shaft 32, and a second bevel gear 33.

More specifically, the first motor 31 is fixedly arranged at the top of the rear side of the furnace body 11, the rotating shaft 32 is arranged at the bottom of the first motor 31 in a transmission manner, the number of the second bevel gears 33 is two, the second bevel gears 33 are fixedly sleeved on the outer side of the rotating shaft 32, and the two second bevel gears 33 are respectively engaged with four first bevel gears 28 in four groups of sealing mechanisms in the two sealing assemblies 2, so that the first motor 31 drives the two second bevel gears 33 to rotate through the rotating shaft 32, and then the two second bevel gears 33 respectively drive the four first bevel gears 28, and further control the opening and closing of the two upper sealing plates 21 and the two lower sealing plates 21.

As shown in fig. 2, the second driving mechanism 4 includes a second motor 41, a lead screw 42, and a third bevel gear 43.

More specifically, the second motor 41 is fixedly arranged at the top of the furnace body 11, the screw rod 42 is located inside the furnace body 11, the top end of the screw rod 42 is in transmission connection with the screw rod 42, and the third bevel gear 43 is fixedly sleeved at the bottom of the outer side of the screw rod 42, so that the second motor 41 drives the screw rod 42 to rotate, and the crucible bearing mechanism 5 is further lifted or lowered.

As shown in fig. 4 and 5, the crucible supporting mechanism 5 includes a supporting plate 51, a supporting seat 52, a mounting plate 53, a second spring 54, a sealing plate 55, and a linking hole 56.

More specifically, the bearing disc 51 is sleeved on the outer side of the screw rod 42 and is in threaded connection with the screw rod 42, the rear side of the top of the bearing disc 51 is provided with guide rods in a sliding and penetrating manner in the vertical direction, two ends of each guide rod are fixedly connected with the inner wall of the furnace body 11, three bearing seats 52 are provided, the three bearing seats 52 are respectively fixedly and nestedly arranged on two sides of the top of the bearing disc 51 and on the front side of the top, two mounting plates 53, two second springs 54 and two sealing plates 55 are respectively and fixedly arranged on the bearing seats 52 on two sides, two sealing plates 55 are respectively arranged on the tops of the two bearing seats 52, one end of each second spring 54 is fixedly connected with the mounting plate 53, and the other end is fixedly connected with the sealing plate 55, so that the three bearing seats 52 are utilized to respectively place raw materials of silver platinum alloy, silver copper chromium alloy and silver calcium alloy, the left and right carrier blocks 52 are sealed by two sealing plates 55.

As shown in fig. 6, the seal releasing assembly 6 includes two sets of releasing mechanisms having the same structure and being symmetrically disposed, and the releasing mechanisms include a second fixing plate 61, a second reciprocating screw 62, a fourth bevel gear 63, a slider 64, a third spring 65, a second connecting rod 66 and an inserting rod 67.

More specifically, the second fixing plate 61 is fixedly connected to the inner wall of the lower heating chamber 15, the second reciprocating screw 62 horizontally penetrates through the second fixing plate 61 and is rotatably connected to the second fixing plate 61 through a bearing, the fourth bevel gear 63 is fixedly disposed at the inner end of the second reciprocating screw 62, the slider 64 is sleeved on the outer side of the second reciprocating screw 62 and is in threaded connection with the second reciprocating screw 62, the third spring 65 and the second connecting rod 66 are both slidably sleeved on the outer side of the second reciprocating screw 62, the left end of the third spring 65 is fixedly connected to the slider 64, the right end of the third spring is fixedly connected to the second connecting rod 66, the inserting rod 67 is fixedly disposed at the top of the second connecting rod 66, so that when the linkage hole 56 is sleeved on the outer side of the inserting rod 67, the screw 42 drives the second reciprocating screw 62 to rotate through the third bevel gear 43 and the fourth bevel gear 63, the slider 64 further moves the insertion rod 67 in a direction away from the lead screw 42 by the third spring 65 and the second link 66, and at this time, the insertion rod 67 pulls the seal plate 55 in the lateral direction, and the second spring 54 extends, and at this time, the two seal plates 55 release the seal with respect to the two carrier seats 52.

As shown in fig. 3, the exhaust mechanism 7 includes an exhaust pipe 71 and an air pump 72.

More specifically, a check valve is arranged on the exhaust pipe 71, the air pump 72 is arranged on the exhaust pipe 71, the exhaust pipe 71 in the exhaust mechanism 7 on the right side penetrates through the outer wall of the furnace body 11 and extends into the feeding and discharging chamber 14, both ends of the exhaust pipe 71 in the exhaust mechanism 7 on the left side behind penetrate through the outer wall of the furnace body 11 and respectively extend into the feeding and discharging chamber 14 and the lower heating chamber 15, both ends of the exhaust pipe 71 in the exhaust mechanism 7 on the right side behind all penetrate through the outer wall of the furnace body 11 and respectively extend into the feeding and discharging chamber 14 and the upper heating chamber 13, so that when the air pump 72 in the exhaust mechanism 7 on the right side behind works, the inside of the feeding and discharging chamber 14 can be vacuumized, and when the air pump 72 in the exhaust mechanism 7 on the left side behind the heating furnace 1 works, the hydrogen in the feeding and discharging chamber 14 can be input into the upper heating chamber 13, the air pump 72 in the exhaust mechanism 7 on the right side of the back of the heating furnace 1 can input the argon gas inside the charging and discharging chamber 14 into the lower heating chamber 15 when in operation.

As shown in fig. 7, the preparation method specifically includes the following steps:

s1, cleaning the metal raw material, and drying for later use after cleaning;

s2, opening the sealing door 12, putting the crucible with the silver, platinum and indium in the bearing seat 52 on the front side, putting the crucible with the silver, copper, chromium and iridium in the bearing seat 52 on the left side, putting the crucible with the silver, calcium and lanthanum in the mounting plate 53 on the right side, closing the sealing door 12, and simultaneously enabling the air pump 72 in the right side exhaust mechanism 7 to work to vacuumize the interior of the feeding and discharging chamber 14;

s3, the first motor 31 drives the rotating shaft 32 to rotate forward, due to the limitation of the overrunning clutch, the rotating shaft 32 drives the two first reciprocating screw rods 26 located above to rotate through the second bevel gear 33, and further the first reciprocating screw rods 26 drive the two closing plates 21 located above to open through the connecting plate 25, the first spring 24 and the first connecting rod 23, at this time, hydrogen in the upper heating chamber 13 enters the feeding and discharging chamber 14, the second motor 41 drives the screw rod 42 to rotate forward, and further the screw rod 42 drives the crucible bearing mechanism 5 to integrally enter the upper heating chamber 13, then the heating pipe in the upper heating chamber 13 is started, the heating pipe raises the temperature in the upper heating chamber 13 and the feeding and discharging chamber 14 to 1170 ℃ and 1200 ℃, at this time, silver, platinum and indium in the crucible in the front side bearing seat 52 are completely melted, silver, platinum and indium in the crucible in the left side bearing seat 52 are completely melted, silver, platinum, indium and indium in the crucible in the left side bearing seat 52 are completely melted, Copper, chromium and iridium and silver, calcium and lanthanum in the crucible in the right bearing seat 52 are preheated;

s4, enabling the second motor 41 to drive the screw rod 42 to rotate reversely, further enabling the whole crucible bearing mechanism 5 to move from the inside of the upper heating chamber 13 to the inside of the feeding and discharging chamber 14 again, then enabling the first motor 31 to drive the rotating shaft 32 to rotate forwardly, further enabling the two sealing plates 21 located above to be folded, blocking the upper heating chamber 13 and the feeding and discharging chamber 14, then utilizing the air pump 72 in the exhaust mechanism 7 on the left side behind the heating furnace 1 to input hydrogen in the feeding and discharging chamber 14 into the upper heating chamber 13, at the moment, a technician can open the sealing door 12, then taking out the crucible in the front side bearing seat 52, performing water-cooling pouring to obtain a silver-platinum alloy, finally closing the sealing door 12, enabling the air pump 72 in the right side exhaust mechanism 7 to work again, and performing vacuum pumping treatment on the inside of the feeding and discharging chamber 14;

s5, the first motor 31 continuously drives the rotating shaft 32 to rotate reversely, due to the limitation of the overrunning clutch, the rotating shaft 32 drives the two first reciprocating screw rods 26 located below to rotate through the second bevel gear 33, and further the first reciprocating screw rods 26 drive the two sealing plates 21 located below to open through the connecting plate 25, the first spring 24 and the first connecting rod 23, at this time, argon gas inside the lower heating chamber 15 enters into the feeding and discharging chamber 14, so that the second motor 41 drives the screw rods 42 to rotate continuously in the reverse direction, and further the whole crucible bearing mechanism 5 descends from the inside of the feeding and discharging chamber 14 to the inside of the lower heating chamber 15, in the descending process of the crucible bearing mechanism 5, the linkage holes 56 on the sealing plate 55 are sleeved outside the insertion rods 67, and simultaneously, when the screw rods 42 rotate, the screw rods 42 drive the second reciprocating screw rods 62 to rotate through the third bevel gears 43 and the fourth bevel gears 63, the slide block 64 drives the insertion rod 67 to move in a direction away from the screw rod 42 through the third spring 65 and the second connecting rod 66, at this time, the insertion rod 67 pulls the sealing plate 55 transversely, so that the second spring 54 extends, at this time, the two sealing plates 55 release the sealing of the two bearing seats 52, at this time, the obtained metal in the two crucibles can be in contact with argon gas, then the heating pipe in the lower heating chamber 15 is started, the heating pipe raises the temperature in the lower heating chamber 15 and the feeding and discharging chamber 14 to 1700-1850 ℃, at this time, the silver, copper, chromium and iridium in the crucible in the left bearing seat 52 are completely melted, and the silver, calcium and lanthanum in the crucible in the right bearing seat 52 are preheated for a second time;

s6, enabling the second motor 41 to drive the screw rod 42 to rotate in the forward direction, further enabling the whole crucible bearing mechanism 5 to move from the inside of the lower heating chamber 15 to the inside of the feeding and discharging chamber 14 again, then enabling the first motor 31 to drive the rotating shaft 32 to rotate reversely, further enabling the two sealing plates 21 located below to be folded, blocking the lower heating chamber 15 and the feeding and discharging chamber 14, then utilizing the air pump 72 in the exhaust mechanism 7 on the back and right side of the heating furnace 1 to input argon gas in the feeding and discharging chamber 14 into the lower heating chamber 15, at the moment, a technician can open the sealing door 12, then taking out the crucible in the left bearing seat 52, performing water-cooling pouring to obtain silver-copper-chromium alloy, finally closing the sealing door 12, enabling the air pump 72 in the right exhaust mechanism 7 to work again, and performing vacuum pumping treatment on the inside of the feeding and discharging chamber 14;

s7, repeating the step S5, so that the whole crucible bearing mechanism 5 enters the lower heating chamber 15 from the inside of the feeding and discharging chamber 14, meanwhile, argon in the lower heating chamber 15 enters the inside of the feeding and discharging chamber 14, then the heating pipe raises the temperature of the lower heating chamber 15 and the inside of the feeding and discharging chamber 14 to 2650-2830 ℃, and at the moment, silver, calcium and lanthanum in the crucible in the right bearing seat 52 are completely melted;

s8, repeating the step S6, so that the crucible bearing mechanism 5 moves from the lower heating chamber 15 to the interior of the feeding and discharging chamber 14, meanwhile, the two sealing plates 21 positioned below are folded, then argon is fed back into the feeding and discharging chamber 14 by using the exhaust mechanism 7 on the right side of the back of the heating furnace 1, at the moment, a technician can open the sealing door 12, then take out the crucible in the right bearing seat 52, perform water-cooling pouring to obtain silver-calcium alloy, and finally close the sealing door 12;

s9, carrying out vacuum continuous casting process on the silver-platinum alloy, the silver-copper-chromium alloy and the silver-calcium alloy at 2240-.

Example 2

Different from the above embodiment, in order to prevent the two sealing plates 55 from having an unsatisfactory sealing effect on the bearing seats 52 on the left and right sides, as shown in fig. 2, the manufacturing apparatus further includes a sealing reinforcing mechanism 8, the sealing reinforcing mechanism 8 is fixedly disposed at the top of the inner cavity of the heating furnace 1, the sealing reinforcing mechanism 8 includes an annular pressing plate 81 and four springs 82, the annular pressing plate 81 is sleeved on the outer side of the lead screw 42 and located above the two sealing plates 55, the four springs 82 are provided with two, the two fourth springs 82 are respectively and fixedly connected to two sides of the top of the annular pressing plate 81, and top ends of the two fourth springs 82 are both fixedly connected to the inner wall of the upper heating chamber 13;

in combination with the above, when the crucible carrying mechanism 5 moves integrally to the top of the upper heating chamber 13, the annular pressing plate 81 can be pressed on the top of the two sealing plates 55, so that the sealing plates 55 and the carrying seats 52 are attached more tightly, and hydrogen gas is prevented from entering the carrying seats 52 through the gaps between the sealing plates 55 and the carrying seats 52 in the heating process.

According to the invention, the sealing components 2, the crucible bearing mechanism 5 and the three groups of exhaust mechanisms 7 are arranged, so that the upper heating chamber 13 and the feeding and discharging chamber 14 and the lower heating chamber 15 and the feeding and discharging chamber 14 are conveniently separated by the two groups of sealing components 2, further the damage to the gas atmosphere in the upper heating chamber 13 and the lower heating chamber 15 during feeding is avoided, the arrangement of the sealing plate 55 in the crucible bearing mechanism 5 can avoid the contact of silver, copper, chromium and iridium and silver, calcium and lanthanum with argon during preheating, the three groups of exhaust mechanisms 7 can respectively evacuate the feeding and discharging chamber 14, hydrogen and argon are recovered, further the damage to the atmosphere in the upper heating chamber 13 and the lower heating chamber 15 is avoided, gas waste can also be avoided, in addition, after the single complete feeding is completed, silver and platinum alloy can be recovered in the subsequent silver and platinum alloy preparation process, Copper, chromium and iridium and silver, calcium and lanthanum are preheated, and silver, calcium and lanthanum can be preheated for the second time in the process of preparing the silver-copper-chromium alloy, so that the time required by preparing the silver-copper-chromium alloy and the silver-calcium alloy is effectively shortened, and the processing efficiency is improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (8)

1. A silver platinum bonding wire with high platinum-containing metal is characterized in that: calculated by mass fraction, the silver-platinum alloy comprises 85-99% of silver, 15-5% of platinum, 0.1-0.2% of copper, 0.2-0.35% of calcium, 0.003-0.01% of chromium and 0.01-0.02% of other doping elements;

the other doping elements comprise 0.004-0.008% of indium, 0.004-0.008% of lanthanum and 0.003-0.009% of iridium.

2. The method for preparing the silver-platinum bonding wire with high platinum metal content according to claim 1, wherein the method comprises the following steps: the preparation method is realized by using preparation equipment, the preparation equipment comprises a heating furnace (1), two sealing components (2) are arranged in the heating furnace (1), a first driving mechanism (3) is arranged on the rear side of the heating furnace (1), the first driving mechanism (3) respectively drives the sealing plates (21) in the two sealing components (2) to fold or open, a second driving mechanism (4) is fixedly arranged at the top of the heating furnace (1), a crucible bearing mechanism (5) is arranged in the middle of the inner cavity of the heating furnace (1), the crucible bearing mechanism (5) is arranged on the second driving mechanism (4) in a lifting manner, a sealing releasing component (6) is arranged at the bottom of the inner cavity of the heating furnace (1), a third bevel gear (43) in the second driving mechanism (4) drives a second reciprocating screw rod (62) in the sealing releasing component (6) to drive an insertion rod (67) to move left or right, insert rod (67) in the seal removing component (6) enters into linkage hole (56) in crucible bearing mechanism (5) and then pulls sealing plate (55) in crucible bearing mechanism (5), so that sealing plate (55) in crucible bearing mechanism (5) removes the seal of bearing seat (52) in crucible bearing mechanism (5), exhaust mechanism (7) is fixedly connected to right side and back side of heating furnace (1), exhaust mechanism (7) on right side vacuumizes charging and discharging chamber (14) in heating furnace (1), exhaust mechanism (7) on back side of heating furnace (1) inputs argon in charging and discharging chamber (14) in heating furnace (1) into heating furnace (1) and inside heating chamber (15) in lower side of heating furnace (1), exhaust mechanism (7) on back right side of heating furnace (1) inputs hydrogen in charging and discharging chamber (14) in heating furnace (1) into heating furnace (1) Inside the upper middle heating chamber (13).

3. The method for preparing the silver-platinum bonding wire with high platinum metal content according to claim 2, wherein the method comprises the following steps: the heating furnace (1) comprises a furnace body (11), a sealing door (12), an upper heating chamber (13), a feeding and discharging chamber (14) and a lower heating chamber (15), the sealing door (12) is movably connected with the middle part of the front surface of the furnace body (11) through a hinge, the upper heating chamber (13), the feeding and discharging chamber (14) and the lower heating chamber (15) are arranged in the furnace body (11) from top to bottom, heating pipes are arranged in the upper heating chamber (13) and the lower heating chamber (15), the hydrogen is filled in the upper heating chamber (13), argon is filled in the lower heating chamber (15), the two sealing assemblies (2) are respectively positioned between the upper heating chamber (13) and the feeding and discharging chamber (14) and between the feeding and discharging chamber (14) and the lower heating chamber (15), and the sealing door (12) is positioned on the front surface of the feeding and discharging chamber (14).

4. The method for preparing the silver-platinum bonding wire with high platinum metal content according to claim 3, wherein the method comprises the following steps: the sealing assembly (2) comprises two groups of sealing mechanisms which are identical in structure and symmetrically arranged, each sealing mechanism comprises a sealing plate (21), a guide frame (22), a first connecting rod (23), a first spring (24), a connecting plate (25), a first reciprocating screw rod (26), a transmission rod (27), a first bevel gear (28) and a first fixing plate (29), the guide frame (22) is arranged on the outer side of the sealing plate (21) in a sliding and sleeved mode, the guide frame (22) is fixedly nested on the outer wall of the furnace body (11), the first connecting rod (23) is fixedly arranged at the outer end of the sealing plate (21), the first spring (24) and the connecting plate (25) are arranged on the outer side of the first connecting rod (23) in a sliding and sleeved mode, one end of the first spring (24) is fixedly connected with the sealing plate (21) and the other end of the first spring is fixedly connected with the connecting plate (25), and the first reciprocating screw rod (26) penetrates through the connecting plate (25) and is in threaded connection with the connecting plate (25), the transmission rod (27) is arranged at the inner end of the first reciprocating screw rod (26) in a transmission way through an overrunning clutch, the first bevel gear (28) is fixedly arranged at the inner end of the transmission rod (27), and the first fixing plate (29) is rotatably sleeved outside the transmission rod (27) through a bearing and is fixedly connected with the furnace body (11);

first actuating mechanism (3) include first motor (31), rotation axis (32) and second bevel gear (33), first motor (31) are fixed to be set up in furnace body (11) rear side top, rotation axis (32) transmission sets up in first motor (31) bottom, second bevel gear (33) are provided with two, two second bevel gear (33) are all fixed the cup joint and are set up in rotation axis (32) outside, and two second bevel gear (33) mesh with four first bevel gear (28) in the four group's of closing mechanism in two closing components (2) respectively.

5. The method for preparing the silver-platinum bonding wire with high platinum metal content according to claim 4, wherein the method comprises the following steps: the second driving mechanism (4) comprises a second motor (41), a screw rod (42) and a third bevel gear (43), the second motor (41) is fixedly arranged at the top of the furnace body (11), the screw rod (42) is positioned inside the furnace body (11), the top end of the screw rod is in transmission connection with the screw rod (42), and the third bevel gear (43) is fixedly sleeved at the bottom of the outer side of the screw rod (42);

the crucible bearing mechanism (5) comprises a bearing disc (51), bearing seats (52), mounting plates (53), second springs (54), sealing plates (55) and linkage holes (56), wherein the bearing disc (51) is sleeved on the outer side of the screw rod (42) and is in threaded connection with the screw rod (42), guide rods are arranged in the vertical direction of the rear side of the top of the bearing disc (51) in a sliding and penetrating mode, two ends of each guide rod are fixedly connected with the inner wall of the furnace body (11), three bearing seats (52) are arranged, the three bearing seats (52) are respectively fixedly nested on two sides of the top of the bearing disc (51) and the front side of the top of the bearing disc, two mounting plates (53), two second springs (54) and two sealing plates (55) are respectively fixedly arranged on the bearing seats (52) on two sides, and the two sealing plates (55) are respectively arranged on the tops of the two bearing seats (52), one end of the second spring (54) is fixedly connected with the mounting plate (53) and the other end of the second spring is fixedly connected with the sealing plate (55);

the seal releasing assembly (6) comprises two groups of releasing mechanisms which are identical in structure and symmetrically arranged, each releasing mechanism comprises a second fixing plate (61), a second reciprocating screw rod (62), a fourth bevel gear (63), a sliding block (64), a third spring (65), a second connecting rod (66) and an inserting rod (67), the second fixing plate (61) is fixedly connected with the inner wall of the lower heating chamber (15), the second reciprocating screw rod (62) penetrates through the second fixing plate (61) in the horizontal direction and is rotatably connected with the second fixing plate (61) through a bearing, the fourth bevel gear (63) is fixedly arranged at the inner end of the second reciprocating screw rod (62), the sliding block (64) is sleeved on the outer side of the second reciprocating screw rod (62) and is in threaded connection with the second reciprocating screw rod (62), and the third spring (65) and the second connecting rod (66) are both slidably sleeved on the outer side of the second reciprocating screw rod (62), and the left end of the third spring (65) is fixedly connected with the sliding block (64), the right end of the third spring is fixedly connected with the second connecting rod (66), and the inserting rod (67) is fixedly arranged at the top of the second connecting rod (66).

6. The method for preparing the silver-platinum bonding wire with high platinum metal content according to claim 5, wherein the method comprises the following steps: exhaust mechanism (7) include blast pipe (71) and air pump (72), be provided with the check valve on blast pipe (71), air pump (72) set up on blast pipe (71), be located in exhaust mechanism (7) on right side blast pipe (71) run through furnace body (11) outer wall and extend to business turn over material cavity (14) inside, be located left exhaust mechanism (7) behind one's back blast pipe (71) both ends all run through furnace body (11) outer wall and extend to business turn over material cavity (14) and heating cavity (15) under and inside respectively, are located behind one's back exhaust mechanism (7) on right side blast pipe (71) both ends all run through furnace body (11) outer wall and extend to business turn over material cavity (14) and upper heating cavity (13) inside respectively.

7. The method for preparing the silver-platinum bonding wire with high platinum metal content according to claim 7, wherein the method comprises the following steps: the preparation equipment further comprises a sealing reinforcing mechanism (8), wherein the sealing reinforcing mechanism (8) is fixedly arranged at the top of an inner cavity of the heating furnace (1), the sealing reinforcing mechanism (8) comprises an annular pressing plate (81) and a fourth spring (82), the annular pressing plate (81) is sleeved and arranged on the outer side of the screw rod (42) and located above the two sealing plates (55), the fourth spring (82) is provided with two springs, the fourth spring (82) is fixedly connected to two sides of the top of the annular pressing plate (81) respectively, and two tops of the fourth spring (82) are fixedly connected with the inner wall of the upper heating cavity (13).

8. The method for preparing the silver-platinum bonding wire with high platinum metal content according to any one of claims 1 to 7, characterized by comprising the following steps:

s1, cleaning the metal raw material, and drying for later use after cleaning;

s2, opening the sealing door (12), putting the crucible with the silver, platinum and indium in the bearing seat (52) on the front side, putting the crucible with the silver, copper, chromium and iridium in the bearing seat (52) on the left side, putting the crucible with the silver, calcium and lanthanum in the mounting plate (53) on the right side, closing the sealing door (12), and simultaneously enabling the air pump (72) in the right side exhaust mechanism (7) to work to vacuumize the interior of the feeding and discharging chamber (14);

s3, enabling a first motor (31) to drive a rotating shaft (32) to rotate forwardly, enabling the rotating shaft (32) to drive two first reciprocating screw rods (26) located above to rotate through a second bevel gear (33) due to the limitation of an overrunning clutch, further enabling the first reciprocating screw rods (26) to drive two closing plates (21) located above to open through a connecting plate (25), a first spring (24) and a first connecting rod (23), enabling hydrogen in an upper heating chamber (13) to enter a feeding and discharging chamber (14), enabling a second motor (41) to drive screw rods (42) to rotate forwardly, further enabling the screw rods (42) to drive a crucible bearing mechanism (5) to integrally enter the upper heating chamber (13), then starting heating pipes in the upper heating chamber (13), and lifting the temperatures of the upper heating chamber (13) and the feeding and discharging chamber (14) to 1170 ℃ by the heating pipes, at the moment, the silver, the platinum and the indium in the crucible in the front bearing seat (52) are completely melted, and the silver, the copper, the chromium and the iridium in the crucible in the left bearing seat (52) and the silver, the calcium and the lanthanum in the crucible in the right bearing seat (52) are preheated;

s4, enabling the second motor (41) to drive the screw rod (42) to rotate reversely, further enabling the whole crucible bearing mechanism (5) to move to the inside of the feeding and discharging chamber (14) again from the inside of the upper heating chamber (13), then enabling the first motor (31) to drive the rotating shaft (32) to rotate forward, further enabling the two sealing plates (21) positioned above to be folded, blocking the upper heating chamber (13) and the feeding and discharging chamber (14), then utilizing an air pump (72) in an exhaust mechanism (7) on the left side behind the heating furnace (1) to input hydrogen in the feeding and discharging chamber (14) into the upper heating chamber (13), at the moment, a technician can open the sealing door (12), then taking out the crucible in the front bearing seat (52), performing water-cooling pouring to obtain a silver-platinum alloy, finally closing the sealing door (12), and enabling the air pump (72) in the right exhaust mechanism (7) to work again, vacuumizing the interior of the feeding and discharging chamber (14);

s5, the first motor (31) continues to drive the rotating shaft (32) to rotate reversely, due to the limitation of the overrunning clutch, the rotating shaft (32) drives the two first reciprocating screw rods (26) located below to rotate through the second bevel gear (33), the first reciprocating screw rods (26) further drive the two sealing plates (21) located below to open through the connecting plates (25), the first springs (24) and the first connecting rods (23), argon in the lower heating chamber (15) enters the feeding and discharging chamber (14), the second motor (41) drives the screw rods (42) to continue to rotate reversely, the whole crucible bearing mechanism (5) is enabled to descend from the inside of the feeding and discharging chamber (14) to the inside of the lower heating chamber (15), and in the descending process of the crucible bearing mechanism (5), the linkage holes (56) in the sealing plate (55) are sleeved outside the insertion rods (67), meanwhile, when the screw rod (42) rotates, the screw rod (42) drives the second reciprocating screw rod (62) to rotate through the third bevel gear (43) and the fourth bevel gear (63), so that the sliding block (64) drives the inserting rod (67) to move in the direction away from the screw rod (42) through the third spring (65) and the second connecting rod (66), at the moment, the inserting rod (67) transversely pulls the sealing plate (55), so that the second spring (54) extends, at the moment, the two sealing plates (55) release the sealing of the two bearing seats (52), at the moment, metal obtained in the two crucibles can be in contact with argon, then a heating pipe in the lower heating chamber (15) is started, the heating pipe raises the temperature in the lower heating chamber (15) and the feeding and discharging chamber (14) to 1850 ℃, at the moment, the silver in the crucible in the left bearing seat (52) can be brought into contact with argon at 1700, Copper, chromium and iridium are completely melted, and silver, calcium and lanthanum in the crucible in the right bearing seat (52) are secondarily preheated;

s6, enabling the second motor (41) to drive the screw rod (42) to rotate in the forward direction, further enabling the whole crucible bearing mechanism (5) to move from the interior of the lower heating chamber (15) to the interior of the feeding and discharging chamber (14) again, then enabling the first motor (31) to drive the rotating shaft (32) to rotate reversely, further enabling the two sealing plates (21) located below to be folded, blocking the lower heating chamber (15) and the feeding and discharging chamber (14), then utilizing an air pump (72) in an exhaust mechanism (7) on the back right side of the heating furnace (1) to input argon in the feeding and discharging chamber (14) into the lower heating chamber (15), enabling a technician to open the sealing door (12), then taking out the crucible in the bearing seat (52) on the left side, performing water-cooling pouring to obtain a silver-copper-chromium alloy, finally closing the sealing door (12), and enabling the air pump (72) in the exhaust mechanism (7) on the right side to work again, vacuumizing the interior of the feeding and discharging chamber (14);

s7, repeating the step S5, so that the whole crucible carrying mechanism (5) enters the lower heating chamber (15) from the inside of the feeding and discharging chamber (14), meanwhile, argon in the lower heating chamber (15) enters the inside of the feeding and discharging chamber (14), then the heating pipe raises the temperature of the lower heating chamber (15) and the inside of the feeding and discharging chamber (14) to 2650-2830 ℃, and at the moment, silver, calcium and lanthanum in the crucible in the right-side carrying seat (52) are completely melted;

s8, repeating the step S6, enabling the crucible bearing mechanism (5) to move to the interior of the feeding and discharging chamber (14) from the lower heating chamber (15), enabling the two sealing plates (21) located below to be folded, then utilizing the exhaust mechanism (7) on the back right side of the heating furnace (1) to feed argon back into the feeding and discharging chamber (14), enabling a technician to open the sealing door (12), then taking out the crucible in the right bearing seat (52), performing water cooling pouring to obtain a silver-calcium alloy, and finally closing the sealing door (12);

s9, carrying out vacuum continuous casting process on the silver-platinum alloy, the silver-copper-chromium alloy and the silver-calcium alloy at 2240-.

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