CN104498762A - Processing method of silver tin oxide electrical contact material containing additives - Google Patents
Processing method of silver tin oxide electrical contact material containing additives Download PDFInfo
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- CN104498762A CN104498762A CN201410840392.2A CN201410840392A CN104498762A CN 104498762 A CN104498762 A CN 104498762A CN 201410840392 A CN201410840392 A CN 201410840392A CN 104498762 A CN104498762 A CN 104498762A
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Abstract
The invention discloses a processing method of a silver tin oxide electrical contact material containing additives. The processing method specifically comprises the following steps: calculating the use level of metal tin, metal additives and silver required according to the material ratio of a silver tin oxide electrical contact required to be prepared, and smelting and atomizing one part with the metal tin and metal additives together in form of metal silver to prepare silver tin alloy powder; after mixing the other part with the prepared silver tin alloy powder in form of silver nitrate, carrying out reaction with sodium hydroxide to obtain composite powder of silver oxide and silver tin alloy; washing the obtained composite powder to be neutral, drying and crushing and putting in an oxygen atmosphere to be oxidized to obtain silver tin oxide composite powder containing the additives; and carrying out isostatic compaction and sintering on the composite powder, carrying out hot extrusion on a silver zinc oxide billet to process a strip or a wire rod, and then machining to obtain the silver tin oxide electrical contact material containing additives. The contact prepared by the method is uniform in metallographic structure and good in processing performance.
Description
Technical field
The present invention relates to a kind of working method of the siller tin oxide electric contact material containing additive, belong to field of metal matrix composite.
Background technology
In recent years, siller tin oxide contact has been widely used in various low-voltage apparatus as the best replacer of poisonous silver cadmium oxide contact.Sliver oxidized tin contactor materials has excellent wear resistance, resistance fusion welding and resistance to arc erosion, but it exists the shortcomings such as contact resistance is large, temperature rise is high, has had a strong impact on the electric property of electrical equipment.
Study discovery through forefathers, the siller tin oxide electric contact material being added with one or more oxide compounds in bismuth oxide, cupric oxide and Indium sesquioxide not only has good wear resistance, resistance fusion welding and resistance to arc erosion, improves the electric property of electrical equipment well.As a rule, the preparation technology containing the siller tin oxide electric contact of additive mainly contains three kinds: powder mixing method, internal oxidation and Chemical coating method.Powder mixing method by mechanically mixing mode, silver powder, putty powder and additive powder is mixed, and then powder mix carried out a series of processing such as shaping, sintering, extruding, finally obtains the siller tin oxide electric contact containing additive.This method preparation technology is simple, the process-cycle is short, but easily occurs the problem that additive is assembled.Internal oxidation refers to will containing the silver-colored tin alloy of Addition ofelements by the obtained silver tin oxide material containing additive of oxidation, then carries out a series of processing such as shaping, sintering, extruding, finally obtains the siller tin oxide electric contact containing additive.The shortcoming of this kind of method easily in material structure, occurs poor oxide region, affects the electrical property of material.Chemical coating method refers to prepares siller tin oxide electric contact material containing additive by chemical clading process.The deficiency of this kind of method to need to adopt to the toxic substance of human body and bad environmental as the reductive agent of reaction process, is unfavorable for the Sustainable development of society.
Through retrieving prior art, publication number is the patent of invention of CN102389981A, discloses a kind of method that continuous uniform prepares silver tin oxide material.The method be first by ultrasonic wave Homogenization Treatments after stannic oxide slurry and silver nitrate solution mix, then got in reactor by two pumps together with ascorbic acid solution and react, obtain elemental silver and be compounded in equably on the surface of stannic oxide.Do not relate to the interpolation of metallic additions in the method, be not dispersed in the method in matrix to additive of sening as an envoy to yet.
Publication number is the patent of invention of CN1234591A, discloses a kind of synthesis method for preparing silver-tin dioxide electric contact materials.Pressed compact after shaping through batch mixing aftershaping, is then pressed into silver-colored liquation and carries out Reactive Synthesis by silver, silver suboxide, tin, stannic oxide, stannous sulfate and Addition ofelements by this invention, then carry out extruding after ingot casting, wire drawing etc. is processed into siller tin oxide electric contact.But easily there is the deficiency that additive is assembled in the method existence.
Summary of the invention
The technical problem to be solved in the present invention is to provide the working method of the siller tin oxide electric contact material containing additive that a kind of technique is simple, additive is evenly distributed in body material, siller tin oxide electric contact metallographic structure obtained by this method evenly, there is excellent processing characteristics.
The working method of the siller tin oxide electric contact material containing additive of the present invention, comprises the following steps:
1) calculate according to the material mixture ratio of the siller tin oxide electric contact of required preparation needed for the consumption of metallic tin, metallic additions and silver, required silver is divided into two portions, a part is together placed in mid-frequency melting furnace with the form of argent and metallic tin and metallic additions and is smelted into uniform alloy molten solution, then makes silver-colored tin alloy powder through being atomized; Another part takes for subsequent use with the form of Silver Nitrate, and generates the consumption of the sodium hydroxide needed for silver suboxide according to the Dosage calculation Silver Nitrate of Silver Nitrate and sodium hydroxide reaction, takes for subsequent use; Get the silver nitrate solution that Silver Nitrate water dissolution is made into 20 ~ 40w/w%, silver-colored tin alloy powder and silver nitrate solution are placed in reactor, stir, obtain the suspension of Silver Nitrate and silver-colored tin alloy powder; Described metallic additions is one or more the combination be selected from bismuth, copper and indium;
2) get the sodium hydroxide solution that sodium hydroxide water dissolution is made into 10 ~ 30w/w%, join step 1) stirring reaction in the suspension of gained, there is precipitation to generate, filter, obtain the composite powder of silver suboxide and silver-colored tin alloy;
3) composite powder of the silver suboxide of gained and silver-colored tin alloy is washed to neutrality, dry, pulverizing is placed in oxygen-containing atmosphere and is oxidized, and then pulverizes, and obtains the siller tin oxide composite powder containing additive;
4) by gained containing the siller tin oxide composite powder isostatic pressing of additive, and then be placed in oxygen-containing atmosphere and sinter, obtain the siller tin oxide billet containing additive;
5) gained siller tin oxide billet through hot extrusion be processed into band or wire rod, after through Rolling compund or drawing, then through punch process or rivet driver processing, namely obtain sheet or the rivet type siller tin oxide electric contact material containing additive.
Required silver is divided into two portions by the present invention, and a part is together placed in mid-frequency melting furnace with the form of argent and metallic tin and metallic additions and is smelted into uniform alloy molten solution, then through silver-colored tin alloy powder that atomization is made containing additive; Another part silver is obtained by reacting the composite powder of silver suboxide and silver-colored tin alloy again with sodium hydroxide after mixing with the obtained silver-colored tin alloy powder containing additive with the form of Silver Nitrate, because the density of silver-colored tin alloy powder (is about 8.5 ~ 9.6g/cm
3) and react the silver suboxide (7.143g/cm generated
3) density relatively, silver suboxide and silver-colored tin alloy powder thus can be made to be mixed to get evenly, silver oxide particle is more evenly distributed in silver-colored tin alloy powder, thus makes gained contact material have uniform metallographic structure; On the other hand, the oxygen that silver-colored tin alloy powder is produced by silver suboxide decomposes in oxidising process and silver-colored tin alloy generation reaction in－situ, decrease the diffusion of tin element to particle top layer, accelerate the oxidation of silver-colored tin alloy powder; Simultaneously, because silver-colored tin alloy particles plays the effect of reacting intermediary in the reaction process of Silver Nitrate and sodium hydroxide, make to react the surface that a part of silver suboxide generated can cover silver-colored tin alloy particles, improve the bonding force between second-phase (i.e. stannic oxide phase), avoid the direct contact between the brittlement phase (i.e. stannic oxide phase) that exists in prior art, thus make contact material have better processing characteristics.
The step 1 of aforesaid method) in, containing in the siller tin oxide electric contact material of additive of described needs preparation, stannic oxide content is 8 ~ 18wt%, and the content of metallic additions is 0.1 ~ 2.5wt%, and surplus is silver; The preferred stannic oxide content that is chosen as is 10 ~ 12wt%, and the content of metallic additions is 0.5 ~ 1wt%, and surplus is silver.In this step, preferably Silver Nitrate is mixed with the silver nitrate solution of 30 ~ 40w/w%, is more preferably the silver nitrate solution being mixed with 30 ~ 35w/w%, the metallographic structure of gained electrical contact material can be made so more even.In this step, the consumption of sodium hydroxide is generally 4/17 ~ 5/17 of Silver Nitrate consumption, is more preferably 4.4/17.When metallic additions is the two or more combination in bismuth, copper and indium, when meeting the total add-on of metallic additions and accounting within the scope of 0.1 ~ 2.5wt% containing the siller tin oxide electric contact material total mass of additive, the proportioning between them can be any proportioning.
The step 1 of aforesaid method) in, be describedly together placed in argent form and metallic tin and metallic additions the ratio that the argent of melting in mid-frequency melting furnace accounts for the total consumption of silver and be generally 10 ~ 80wt%.
The step 2 of aforesaid method) in, the speed that adds of described sodium hydroxide solution is preferably 0.1 ~ 1L/min; The concentration of described sodium hydroxide solution is preferably 15 ~ 25w/w%, and the metallographic structure of gained electrical contact material can be made so more even.In this step, stirring reaction carries out usually under normal temperature condition, and the time of stirring reaction is generally 0.3 ~ 1h.
The step 3 of aforesaid method) in, operation that is dry and that pulverize is same as the prior art, and in the application, preferably drying is until dry the composite powder of silver suboxide and silver-colored tin alloy under 100 ~ 150 DEG C of conditions, usually needs the time of 12 ~ 18h; Normally the composite powder pulverizing of dried silver suboxide and silver-colored tin alloy is crossed 100 ~ 200 eye mesh screens afterwards, extracting screen underflow enters next process.Described oxidation preferably oxygen pressure be 0.1 ~ 1.0MPa, temperature carries out under being 400 ~ 800 DEG C of conditions, the time of oxidation is 6 ~ 12h.
The step 4 of aforesaid method) in, described isostatic pressing is identical with existing routine operation with sintering operation, and particularly, the forming pressure of isostatic pressing is generally 100 ~ 150MPa; Normally the pressed compact after isostatic pressing is placed in oxygen-containing atmosphere and sinters 4 ~ 8h under 880 ~ 920 DEG C of temperature condition, to obtain the siller tin oxide billet containing additive.
The step 5 of aforesaid method) in, the operation such as described hot extrusion is all identical with existing routine operation, and particularly, the temperature of hot extrusion is generally 750 ~ 900 DEG C, and extrusion ratio is 10 ~ 200.When by when being processed into band containing the siller tin oxide billet hot extrusion of additive, gained band through repeatedly Rolling compund, to be annealed to after desired size through punch ram, obtain the siller tin oxide electric contact material containing additive of sheet.When by when being processed into wire rod containing the siller tin oxide billet hot extrusion of additive, gained wire rod through repeatedly drawing, to be annealed to after desired size through rivet driver processing, obtain the siller tin oxide electric contact material containing additive of rivet type.
Compared with prior art, feature of the present invention is:
1, required silver is divided into two portions by the present invention, and a part is together placed in mid-frequency melting furnace with the form of argent and metallic tin and metallic additions and is smelted into uniform alloy molten solution, then through silver-colored tin alloy powder that atomization is made containing additive; Another part silver is obtained by reacting the composite powder of silver suboxide and silver-colored tin alloy again with sodium hydroxide after mixing with the obtained silver-colored tin alloy powder containing additive with the form of Silver Nitrate, because the density of silver-colored tin alloy powder (is about 8.5 ~ 10.5g/cm
3) and react the silver suboxide (7.143g/cm generated
3) density relatively, silver suboxide and silver-colored tin alloy powder thus can be made to be mixed to get evenly, silver oxide particle is more evenly distributed in silver-colored tin alloy powder, thus makes gained contact material have uniform metallographic structure; On the other hand, the oxygen that silver-colored tin alloy powder is produced by silver suboxide decomposes in oxidising process and silver-colored tin alloy generation reaction in－situ, decrease the diffusion of tin element to particle top layer, accelerate the oxidation of silver-colored tin alloy powder; Simultaneously, because silver-colored tin alloy particles plays the effect of reacting intermediary in the reaction process of Silver Nitrate and sodium hydroxide, make to react the surface that a part of silver suboxide generated can cover silver-colored tin alloy particles, improve the bonding force between second-phase (i.e. stannic oxide phase), avoid the direct contact between the brittlement phase (i.e. stannic oxide phase) that exists in prior art, thus make contact material have better processing characteristics.
2, the method for the invention technique is simple, to human body and environmental pollution little, be applicable to suitability for industrialized production.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure (200 ×) of the contact material that the embodiment of the present invention 1 obtains;
Fig. 2 is the metallographic structure figure (200 ×) of the contact material that the embodiment of the present invention 2 obtains;
Fig. 3 is the metallographic structure figure (200 ×) of the contact material that the embodiment of the present invention 3 obtains;
Fig. 4 is the metallographic structure figure (200 ×) of the contact material that the embodiment of the present invention 4 obtains.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and to understand content of the present invention better, but the present invention is not limited to following examples.
Embodiment 1
1) first according to preparation 10kg Ag-SnO
2(11)-In
2o
3(1.5) material mixture ratio calculates the consumption of required indium metal, silver, tin, take pure indium block 0.012kg, block tin 0.866kg for subsequent use, the total amount of silver is divided into two parts, wherein a part is the fine silver block of 4.896kg, another part is the Silver Nitrate of 6.066kg, take for subsequent use, then according to the consumption weighing sodium hydroxide 1.57kg of Silver Nitrate, for subsequent use;
2) the pure indium block, block tin and the fine silver block that take are placed in mid-frequency melting furnace are smelted into uniform alloy molten solution, be then atomized through hydraulic atomized equipment, the powder slurries obtained is dried, crosses 200 mesh sieves, obtain silver-colored tin-indium alloy powder;
3) get the silver nitrate solution that Silver Nitrate water dissolution is made into 40w/w%, the silver-colored tin-indium alloy powder of gained and silver nitrate solution are placed in reactor, stir, obtain the suspension of Silver Nitrate and silver-colored tin-indium alloy powder;
4) sodium hydroxide solution that sodium hydroxide water is made into 30w/w% is got, under agitation condition, in above-mentioned gained suspension, add the sodium hydroxide solution (drop rate is 0.3L/min) of 30w/w%, reaction 0.5h, obtains the composite powder of silver suboxide and silver-colored tin-indium alloy after filtration;
5) by the above-mentioned silver suboxide that is obtained by reacting and silver-colored tin-indium alloy composite powder washed with de-ionized water to neutral, 15h is dried in an oven subsequently with 120 DEG C of temperature, then the silver suboxide of oven dry and silver-colored tin-indium alloy composite powder are placed in bipyramid blender broken (rotating speed 25r/min, time 1h); It is that the oxygen atmosphere of 0.5MPa is oxidized 10h under 750 DEG C of conditions that gained powder is placed in oxygen pressure, crosses 200 mesh sieves, obtains silver-tin oxide or indium oxide composite powder;
6) gained composite powder shaping on isostatic pressing machine (forming pressure is 150MPa), and the pressed compact after shaping is placed in air with 880 DEG C of temperature sintering 4h, obtain silver-tin oxide or indium oxide billet;
7) wire rod is processed in the hot extrusion of gained silver-tin oxide or indium oxide billet, and extrusion temperature is 850 DEG C, and mold preheating temperature is 150 DEG C, and extrusion ratio is 190; Gained wire rod again through repeatedly drawing, be annealed to required size after to be processed into the silver-tin oxide or indium oxide (Ag-SnO of rivet type with rivet driver
2(11)-In
2o
3(1.5)) electrical contact.
Carry out metallographic structure analysis to gained contact material, as shown in Figure 1, the metallographic structure of contact product prepared of technical scheme is even as seen from the figure, and tiny stannic oxide and indium oxide particles are evenly distributed in silver matrix.
Embodiment 2
1) first according to preparation 10kg Ag-SnO
2(11)-Bi
2o
3(1.5)-CuO (1.0) material mixture ratio calculates the consumption of required bismuth metal, copper, silver, tin, take pure bismuth block 0.013kg, fine copper block 0.008kg, block tin 0.866kg are for subsequent use, the total amount of silver is divided into two parts, wherein a part is the fine silver block of 4.887kg, another part is the Silver Nitrate of 5.923kg, take for subsequent use, then according to the consumption weighing sodium hydroxide 1.533kg of Silver Nitrate, for subsequent use;
2) the bismuth block taken, fine copper block, block tin and fine silver block are placed in mid-frequency melting furnace are smelted into uniform alloy molten solution, then be atomized through hydraulic atomized equipment, the powder slurries obtained is dried, crosses 200 mesh sieves, obtain silver-colored tin bismuth copper alloy powder;
3) get the silver nitrate solution that Silver Nitrate water dissolution is made into 30w/w%, the silver-colored tin bismuth copper alloy powder of gained and silver nitrate solution are placed in reactor, stir, obtain the suspension of Silver Nitrate and Yin Xi bismuth copper alloy powder;
4) sodium hydroxide solution that sodium hydroxide water is made into 10w/w% is got, under agitation condition, in above-mentioned gained suspension, add the sodium hydroxide solution (drop rate is 1L/min) of 10w/w%, reaction 0.8h, obtains the composite powder of silver suboxide and Yin Xi bismuth copper after filtration;
5) by the above-mentioned silver suboxide that is obtained by reacting and Yin Xi bismuth copper alloy composite powder washed with de-ionized water to neutral, 18h is dried in an oven subsequently with 100 DEG C of temperature, then the silver suboxide of oven dry and Yin Xi bismuth copper alloy composite powder are placed in bipyramid blender broken (rotating speed 25r/min, time 1h); It is that the oxygen atmosphere of 1.0MPa is oxidized 6h under 720 DEG C of conditions that gained powder is placed in oxygen pressure, crosses 200 mesh sieves, obtains siller tin oxide bismuth oxide cupric oxide composite powder;
6) gained composite powder shaping on isostatic pressing machine (forming pressure is 120MPa), and the pressed compact after shaping is placed in air with 900 DEG C of temperature sintering 6h, obtain siller tin oxide bismuth oxide cupric oxide billet;
7) band is processed in the hot extrusion of gained siller tin oxide bismuth oxide cupric oxide billet, and extrusion temperature is 850 DEG C, and mold preheating temperature is 150 DEG C, and extrusion ratio is 160; Again by band through repeatedly Rolling compund, be annealed to required size after to be processed into the siller tin oxide bismuth oxide cupric oxide (Ag-SnO of sheet with punch press
2(11)-Bi
2o
3(1.5)-CuO (1.0)) electrical contact.
Carry out metallographic structure analysis to gained contact material, as shown in Figure 2, the metallographic structure of contact product prepared of technical scheme is even as seen from the figure, and tiny stannic oxide, bismuth oxide and copper oxide particle are evenly distributed in silver matrix.
Embodiment 3
1) first according to preparation 10kg Ag-SnO
2(18)-CuO (0.1) material mixture ratio calculates the consumption of required metallic copper, silver, tin, take fine copper block 0.008kg, block tin 1.417kg for subsequent use, the total amount of silver is divided into two parts, wherein a part is the fine silver block of 5.66kg, another part is the Silver Nitrate of 3.982kg, take for subsequent use, then according to the consumption weighing sodium hydroxide 1.031kg of Silver Nitrate, for subsequent use;
2) the fine copper block taken, block tin and fine silver block are placed in mid-frequency melting furnace are smelted into uniform alloy molten solution, be then atomized through hydraulic atomized equipment, the powder slurries obtained is dried, crosses 200 mesh sieves, obtain silver-colored gun-metal powder;
3) get the silver nitrate solution that Silver Nitrate water dissolution is made into 25w/w%, the silver-colored gun-metal powder of gained and silver nitrate solution are placed in reactor, stir, obtain the suspension of Silver Nitrate and silver-colored gun-metal powder;
4) sodium hydroxide solution that sodium hydroxide water is made into 20w/w% is got, under agitation condition, in above-mentioned gained suspension, add the sodium hydroxide solution (drop rate is 1L/min) of 20w/w%, reaction 0.5h, obtains the composite powder of silver suboxide and Yin Xi copper after filtration;
5) by the above-mentioned silver suboxide that is obtained by reacting and silver-colored gun-metal composite powder washed with de-ionized water to neutral, 18h is dried in an oven subsequently with 100 DEG C of temperature, then the silver suboxide of oven dry and silver-colored gun-metal composite powder are placed in bipyramid blender broken (rotating speed 25r/min, time 1h); It is that the oxygen atmosphere of 0.8MPa is oxidized 12h under 680 DEG C of conditions that gained powder is placed in oxygen pressure, crosses 200 mesh sieves, obtains siller tin oxide cupric oxide composite powder;
6) gained composite powder shaping on isostatic pressing machine (forming pressure is 150MPa), and the pressed compact after shaping is placed in air with 920 DEG C of temperature sintering 6h, obtain siller tin oxide cupric oxide billet;
7) band is processed in the hot extrusion of gained siller tin oxide cupric oxide billet, and extrusion temperature is 850 DEG C, and mold preheating temperature is 150 DEG C, and extrusion ratio is 150; Again by band through repeatedly Rolling compund, be annealed to required size after to be processed into the siller tin oxide cupric oxide (Ag-SnO of sheet with punch press
2(18)-CuO (0.1)) electrical contact.
Carry out metallographic structure analysis to gained contact material, as shown in Figure 3, the metallographic structure of contact product prepared of technical scheme is even as seen from the figure, and tiny stannic oxide and copper oxide particle are evenly distributed in silver matrix.
Embodiment 4
1) first according to preparation 10kg Ag-SnO
2(12)-In
2o
3(0.5)-Bi
2o
3(0.5)-CuO (0.5) material mixture ratio calculates the consumption of required indium metal, bismuth metal, metallic copper, silver, tin, take fine copper block 0.04kg, pure bismuth block 0.045kg, pure indium block 0.041kg, block tin 0.945kg are for subsequent use, the total amount of silver is divided into two parts, wherein a part is the fine silver block of 5.228kg, another part is the Silver Nitrate of 5.386kg, take for subsequent use, then according to the consumption weighing sodium hydroxide 1.394kg of Silver Nitrate, for subsequent use;
2) the pure indium block taken, pure bismuth block, fine copper block, block tin and fine silver block are placed in mid-frequency melting furnace are smelted into uniform alloy molten solution, then be atomized through hydraulic atomized equipment, the powder slurries obtained is dried, crosses 200 mesh sieves, obtain silver-colored tin indium bismuth copper alloy powder;
3) get the silver nitrate solution that Silver Nitrate water dissolution is made into 30w/w%, the silver-colored tin indium bismuth copper alloy powder of gained and silver nitrate solution are placed in reactor, stir, obtain the suspension of Silver Nitrate and Yin Xi indium bismuth copper alloy powder;
4) sodium hydroxide solution that sodium hydroxide water is made into 25w/w% is got, under agitation condition, in above-mentioned gained suspension, add the sodium hydroxide solution (drop rate is 1L/min) of 25w/w%, reaction 0.5h, obtains the composite powder of silver suboxide and Yin Xi indium bismuth copper after filtration;
5) by the above-mentioned silver suboxide that is obtained by reacting and Yin Xi indium bismuth copper alloy composite powder washed with de-ionized water to neutral, 15h is dried in an oven subsequently with 120 DEG C of temperature, then the silver suboxide of oven dry and Yin Xi indium bismuth copper alloy composite powder are placed in bipyramid blender broken (rotating speed 25r/min, time 1h); It is that the oxygen atmosphere of 0.1MPa is oxidized 8h under 700 DEG C of conditions that gained powder is placed in oxygen pressure, crosses 200 mesh sieves, obtains silver-tin oxide or indium oxide bismuth oxide cupric oxide composite powder;
6) gained composite powder shaping on isostatic pressing machine (forming pressure is 150MPa), and the pressed compact after shaping is placed in air with 920 DEG C of temperature sintering 6h, obtain silver-tin oxide or indium oxide bismuth oxide cupric oxide billet;
7) band is processed in the hot extrusion of gained silver-tin oxide or indium oxide bismuth oxide cupric oxide billet, and extrusion temperature is 850 DEG C, and mold preheating temperature is 150 DEG C, and extrusion ratio is 150; Again by band through repeatedly Rolling compund, be annealed to required size after to be processed into the silver-tin oxide or indium oxide bismuth oxide cupric oxide (Ag-SnO of sheet with punch press
2(12)-In
2o
3(0.5)-Bi
2o
3(0.5)-CuO (0.5)) electrical contact.
Carry out metallographic structure analysis to gained contact material, as shown in Figure 4, the metallographic structure of contact product prepared of technical scheme is even as seen from the figure, and tiny stannic oxide, Indium sesquioxide, bismuth oxide and copper oxide particle are evenly distributed in silver matrix.
The contact material that embodiment 1 is obtained carries out Performance Detection, and compares with the contact product that existing routine mixes the siller tin oxide of the interpolation Indium sesquioxide that powder-extrusion process obtains, and result is as shown in following table 1 and table 2:
Table 1: embodiment 1 and existing routine mix wire product performance prepared by powder-extrusion process
Table 2 embodiment 1 and existing routine mix the electric life of rivet type contact prepared by powder-extrusion process
From table 1 and table 2, the performance of sliver oxidized tin contactor materials prepared by technical scheme is better than existing routine and mixes powder-extrusion process sliver oxidized tin contactor materials performance.
Claims (6)
1., containing a working method for the siller tin oxide electric contact material of additive, it is characterized in that comprising the following steps:
1) calculate according to the material mixture ratio of the siller tin oxide electric contact of required preparation needed for the consumption of metallic tin, metallic additions and silver, required silver is divided into two portions, a part is together placed in mid-frequency melting furnace with the form of argent and metallic tin and metallic additions and is smelted into uniform alloy molten solution, then makes silver-colored tin alloy powder through being atomized; Another part takes for subsequent use with the form of Silver Nitrate, and generates the consumption of the sodium hydroxide needed for silver suboxide according to the Dosage calculation Silver Nitrate of Silver Nitrate and sodium hydroxide reaction, takes for subsequent use; Get the silver nitrate solution that Silver Nitrate water dissolution is made into 20 ~ 40w/w%, silver-colored tin alloy powder and silver nitrate solution are placed in reactor, stir, obtain the suspension of Silver Nitrate and silver-colored tin alloy powder; Described metallic additions is one or more the combination be selected from bismuth, copper and indium;
2) get the sodium hydroxide solution that sodium hydroxide water dissolution is made into 10 ~ 30w/w%, join step 1) stirring reaction in the suspension of gained, there is precipitation to generate, filter, obtain the composite powder of silver suboxide and silver-colored tin alloy;
3) composite powder of the silver suboxide of gained and silver-colored tin alloy is washed to neutrality, dry, pulverizing is placed in oxygen-containing atmosphere and is oxidized, and then pulverizes, and obtains the siller tin oxide composite powder containing additive;
4) by gained containing the siller tin oxide composite powder isostatic pressing of additive, and then be placed in oxygen-containing atmosphere and sinter, obtain the siller tin oxide billet containing additive;
5) gained siller tin oxide billet through hot extrusion be processed into band or wire rod, after through Rolling compund or drawing, then through punch process or rivet driver processing, namely obtain sheet or the rivet type siller tin oxide electric contact material containing additive.
2. working method according to claim 1, is characterized in that: step 1) in, need in the siller tin oxide electric contact material of preparation, stannic oxide content is 8 ~ 18wt%, and the content of metallic additions is 0.1 ~ 2.5wt%, and surplus is silver.
3. working method according to claim 1, is characterized in that: step 1) in, be describedly together placed in argent form and metallic tin and metallic additions 10 ~ 80wt% that the argent of melting in mid-frequency melting furnace accounts for the total consumption of silver.
4. working method according to claim 1, is characterized in that: step 1) in, step 1) in, get the silver nitrate solution that Silver Nitrate water dissolution is made into 30 ~ 40w/w%.
5. working method according to claim 1, is characterized in that: step 1) in, the consumption of sodium hydroxide is 4/17 ~ 5/17 of Silver Nitrate consumption.
6. working method according to claim 1, is characterized in that: step 2) in, the concentration of sodium hydroxide solution is 15 ~ 25w/w%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109500391A (en) * | 2019-01-05 | 2019-03-22 | 桂林电器科学研究院有限公司 | A kind of preparation method of high ductility silver zinc oxide contact material |
| CN109500392A (en) * | 2019-01-05 | 2019-03-22 | 桂林电器科学研究院有限公司 | A kind of preparation method for the silver zinc oxide contact material improving ingot blank agglutinating property |
| CN109593981A (en) * | 2018-12-25 | 2019-04-09 | 桂林金格电工电子材料科技有限公司 | A kind of preparation method for the sliver oxidized tin contactor materials improving ingot blank agglutinating property |
| CN114438359A (en) * | 2021-12-28 | 2022-05-06 | 温州中希电工合金有限公司 | Preparation method of silver tin oxide electrical contact material |
| CN115637349A (en) * | 2022-09-17 | 2023-01-24 | 浙江福达合金材料科技有限公司 | Silver tin oxide electric contact material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109593981A (en) * | 2018-12-25 | 2019-04-09 | 桂林金格电工电子材料科技有限公司 | A kind of preparation method for the sliver oxidized tin contactor materials improving ingot blank agglutinating property |
| CN109500391A (en) * | 2019-01-05 | 2019-03-22 | 桂林电器科学研究院有限公司 | A kind of preparation method of high ductility silver zinc oxide contact material |
| CN109500392A (en) * | 2019-01-05 | 2019-03-22 | 桂林电器科学研究院有限公司 | A kind of preparation method for the silver zinc oxide contact material improving ingot blank agglutinating property |
| CN109500392B (en) * | 2019-01-05 | 2021-03-16 | 桂林电器科学研究院有限公司 | Preparation method of silver zinc oxide contact material for improving sintering property of ingot blank |
| CN114438359A (en) * | 2021-12-28 | 2022-05-06 | 温州中希电工合金有限公司 | Preparation method of silver tin oxide electrical contact material |
| CN115637349A (en) * | 2022-09-17 | 2023-01-24 | 浙江福达合金材料科技有限公司 | Silver tin oxide electric contact material and preparation method thereof |
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Address after: 541004 Dongcheng Road, Guilin, the Guangxi Zhuang Autonomous Region 8 Patentee after: Guilin Jinge Electrotechnical Electronic Material Science & Technology Co., Ltd. Address before: 541004 Dongcheng Road, Seven Star District, Guilin, the Guangxi Zhuang Autonomous Region 8 Patentee before: Guilin Jinge Electrotechnical Electronic Material Science & Technology Co., Ltd. |