CN103247450B - Electrical contact - Google Patents
Electrical contact Download PDFInfo
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- CN103247450B CN103247450B CN201310140001.1A CN201310140001A CN103247450B CN 103247450 B CN103247450 B CN 103247450B CN 201310140001 A CN201310140001 A CN 201310140001A CN 103247450 B CN103247450 B CN 103247450B
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Abstract
The invention relates to an electrical contact and a preparation method thereof. The preparation method of the electrical contact comprises the process steps of weighing, mixing, granulation, initial pressing, infiltration, re-pressing, cleaning, inspection and packaging which are specifically as follows: a, weighing: weighing Ag powder, Cu powder, infiltration copper sheets and W powder according to the proportion of 28%-34% : 2% : 16% - 20% : 48%-52%; b, mixing: uniformly mixing the Ag powder, Cu powder and W powder weighed in the step a and filling into a graphite boat, putting the graphite boat into a furnace with the temperature of 880-920 DEG C for heat preservation for 2-3 hours, then cooling and taking out the graphite boat; and c, infiltration: placing the formed blank through initial pressing on a graphite plate, laying infiltration copper sheets on the surface of the formed blank, performing infiltration with the furnace temperature of 1180-1220 DEG C, then after 8-10 min, pushing away half of the graphite boat and introducing hydrogen for protection. The electrical contact prepared by the invention saves silver, and is large in density and hardness, and lower in resistivity.
Description
Technical field
The present invention relates to a kind of electrical contact, be specifically related to a kind of electrical contact and preparation method thereof.
Background technology
Contact material is used as the contact material such as appliance switch, instrument and meter, is responsible for the task of joint weldment electric current, and therefore, its performance quality directly affects reliability service and the useful life of appliance switch and instrument and meter.The phenomenon that electrical contact produces in opening and closing process is extremely complicated, and influencing factor is more, and desirable contact material must possess good physical property, electrical contact performance, processing and manufacturing performance etc.
Contact material many employings fine silver of drought period, but because silver point is low, hardness is not high and not wear-resisting, in the medium of sulfur-bearing or sulfide, table and easily form silver sulfide film; Under direct current effect, volatile, easily form electroerosion spine, silver-colored contact element easily forms electric arc, makes its welding.In order to overcome the various shortcoming of fine silver contact material, develop silver alloy, in silver, namely add other element a small amount of as Cu, Cd, Pd, Au, Mg, In, V, Zr etc. can overcome the naturally flexible of silver, improve mechanical property and corrosion resistance, and still keep higher conductance.
Along with the history of industrialized fast development and electronic product is newly regenerated, more and more higher requirement is proposed to the research and development of contact material.
When current electrical contact on the market makes, silver content is higher, which greatly enhances the production cost of electrical contact, makes its price costly.
Summary of the invention
According to the deficiencies in the prior art, the invention provides and a kind ofly save silver, density is large, hardness is large, resistivity is lower electrical contact.
According to the deficiencies in the prior art, technical scheme provided by the invention is: a kind of electrical contact, composed of the following components, and the ratio of each component is:
Ag：Cu：W=28%～34%：18%～22%：48%～52%。
A kind of electrical contact: composed of the following components, and the ratio of each component is: Ag:Cu:W=28%:22%:50%.
A preparation method for electrical contact, comprises weighing-mixing-granulation-first pressing-infiltration-multiple pressure-cleaning-inspection-packaging, comprises following processing step:
A weighs: Ag powder, Cu powder, infiltration copper sheet and the W powder ratio in 28% ~ 34%:2%:16% ~ 20%:48% ~ 52% weighed;
B mixes: by load weighted for step a Ag powder, Cu powder and W powder, loads in graphite boat after mixing, and puts into stove insulation cooling taking-up after 2 ~ 3 hours of 880 DEG C ~ 920 DEG C;
C infiltration: first pressing shaping block is emitted on graphite cake, above lay infiltration copper sheet, carry out infiltration, furnace temperature is 1180 DEG C ~ 1220 DEG C, within 8 ~ 10 minutes, pushes away half boat, and passes into hydrogen shield.
Described silver powder: Ag%>=99.5, apparent density is 1.5 ~ 3.0 g/cm
2; Copper powder: Cu%>=99.5; Tungsten powder: W%>=99.9, granularity is 2.5 ~ 5.5 μ; Copper sheet: Cu %>=99.9.
The invention has the beneficial effects as follows: the present invention adopts Ag, Cu and W tri-kinds of raw materials to prepare electrical contact, saves silver, and the electrical contact density of preparation is large, hardness large, resistivity is lower.
Embodiment
Embodiment one
A kind of electrical contact, composed of the following components, and the ratio of each component is:
Ag：Cu：W=28%：22%：50%。
This preparation method, comprises weighing-mixing-granulation-first pressing-infiltration-multiple pressure-cleaning-inspection-packaging, comprises following processing step:
1, weigh: Ag powder, Cu powder, infiltration copper sheet and the W powder ratio in 28%:2%:20%:50% is weighed; Choose silver powder: Ag%>=99.5, apparent density is 1.5 ~ 3.0 g/cm
2; Copper powder: Cu%>=99.5; Tungsten powder: W%>=99.9, granularity is 2.5 ~ 5.5 μ; Copper sheet: Cu %>=99.9.
2, mix: by load weighted for step a Ag powder, Cu powder and W powder, load in graphite boat after mixing, put into stove insulation cooling taking-up after 2 ~ 3 hours of 880 DEG C ~ 920 DEG C.
3, granulation: make with granulator the particle that particle diameter is about about 0.5mm again.
4, first pressing: according to product drawing check and correction mould and regarding sizes, according to product weight, pressure embryo height, the pressure in unit are etc. are suppressed, and check at any time, instant adjustment of pinpointing the problems.
5, infiltration: first pressing shaping block is emitted on graphite cake, above lay infiltration copper sheet, carry out infiltration, furnace temperature is 1180 DEG C, within 8 minutes, pushes away half boat, and passes into hydrogen shield.
6, multiple pressure: product size after pressure testing, density through head examine qualified after, the more multiple pressure of batch.And require without burr, surface should be smooth, without depression and projection.
7, clean: deburring polishing, makes product surface uniform color consistent.
8, check: the presentation quality of product, also can by magnifying glass (10X), tool microscope observation generally with range estimation.The vernier caliper of size accuracy value 0.02mm and scale division value are that the outside micrometer of 0.01mm is tested, and often criticize and randomly draw 3 ~ 5 (points 8 ~ 12) and send physics and chemistry to carry out physico-chemical analysis.
Packaging: after the assay was approved, just can pack, product must be placed in the polybag of sealing.Prepared electrical contact detects its physical and mechanical property in table 1.
Embodiment two
A kind of electrical contact, composed of the following components, and the ratio of each component is:
Ag：Cu：W=30%：18%：52%。
This preparation method, comprises weighing-mixing-granulation-first pressing-infiltration-multiple pressure-cleaning-inspection-packaging, comprises following processing step:
1, weigh: Ag powder, Cu powder, infiltration copper sheet and the W powder ratio in 30%:2%:16%:52% is weighed; Choose silver powder: Ag%>=99.5, apparent density is 1.5 ~ 3.0 g/cm
2; Copper powder: Cu%>=99.5; Tungsten powder: W%>=99.9, granularity is 2.5 ~ 5.5 μ; Copper sheet: Cu %>=99.9.
2, mix: by load weighted for step a Ag powder, Cu powder and W powder, load in graphite boat after mixing, put into stove insulation cooling taking-up after 2 ~ 3 hours of 880 DEG C ~ 920 DEG C.
3, granulation: make with granulator the particle that particle diameter is about about 0.5mm again.
4, first pressing: according to product drawing check and correction mould and regarding sizes, according to product weight, pressure embryo height, the pressure in unit are etc. are suppressed, and check at any time, instant adjustment of pinpointing the problems.
5, infiltration: first pressing shaping block is emitted on graphite cake, above lay infiltration copper sheet, carry out infiltration, furnace temperature is 1220 DEG C, within 10 minutes, pushes away half boat, and passes into hydrogen shield.
6, multiple pressure: product size after pressure testing, density through head examine qualified after, the more multiple pressure of batch.And require without burr, surface should be smooth, without depression and projection.
7, clean: deburring polishing, makes product surface uniform color consistent.
8, check: the presentation quality of product, also can by magnifying glass (10X), tool microscope observation generally with range estimation.The vernier caliper of size accuracy value 0.02mm and scale division value are that the outside micrometer of 0.01mm is tested, and often criticize and randomly draw 3 ~ 5 (points 8 ~ 12) and send physics and chemistry to carry out physico-chemical analysis.
Packaging: after the assay was approved, just can pack, product must be placed in the polybag of sealing.Prepared electrical contact detects its physical and mechanical property in table 1.
Embodiment three
A kind of electrical contact, composed of the following components, and the ratio of each component is:
Ag：Cu：W=34%：18%：48%。
This preparation method, comprises weighing-mixing-granulation-first pressing-infiltration-multiple pressure-cleaning-inspection-packaging, comprises following processing step:
1, weigh: Ag powder, Cu powder, infiltration copper sheet and the W powder ratio in 32%:2%:16%:48% is weighed; Choose silver powder: Ag%>=99.5, apparent density is 1.5 ~ 3.0 g/cm
2; Copper powder: Cu%>=99.5; Tungsten powder: W%>=99.9, granularity is 2.5 ~ 5.5 μ; Copper sheet: Cu %>=99.9.
2, mix: by load weighted for step a Ag powder, Cu powder and W powder, load in graphite boat after mixing, put into stove insulation cooling taking-up after 2 ~ 3 hours of 880 DEG C ~ 920 DEG C.
3, granulation: make with granulator the particle that particle diameter is about about 0.5mm again.
4, first pressing: according to product drawing check and correction mould and regarding sizes, according to product weight, pressure embryo height, the pressure in unit are etc. are suppressed, and check at any time, instant adjustment of pinpointing the problems.
5, infiltration: first pressing shaping block is emitted on graphite cake, above lay infiltration copper sheet, carry out infiltration, furnace temperature is 1200 DEG C, within 9 minutes, pushes away half boat, and passes into hydrogen shield.
6, multiple pressure: product size after pressure testing, density through head examine qualified after, the more multiple pressure of batch.And require without burr, surface should be smooth, without depression and projection.
7, clean: deburring polishing, makes product surface uniform color consistent.
8, check: the presentation quality of product, also can by magnifying glass (10X), tool microscope observation generally with range estimation.The vernier caliper of size accuracy value 0.02mm and scale division value are that the outside micrometer of 0.01mm is tested, and often criticize and randomly draw 3 ~ 5 (points 8 ~ 12) and send physics and chemistry to carry out physico-chemical analysis.
Packaging: after the assay was approved, just can pack, product must be placed in the polybag of sealing.Prepared electrical contact detects its physical and mechanical property in table 1.
| Embodiment | Density (g/cm 3） | Resistivity (μ Ω .cm) | Hardness HB (kgf/mm2) |
| Embodiment one | 12.40 | 3.2 | 110 |
| Embodiment two | 12.41 | 3.1 | 112 |
| Embodiment three | 12.45 | 3.0 | 114 |
As known from Table 1, the electrical contact that prepared by the present invention has the advantage that density is higher, resistivity is lower, hardness is large.
Claims (3)
1. an electrical contact, is characterized in that: composed of the following components, and the ratio of each component is:
Ag:Cu:W=28% ~ 34%:18% ~ 22%:48% ~ 52%, described electrical contact is prepared by following processing step:
A weighs: Ag powder, Cu powder, infiltration copper sheet and the W powder ratio in 28% ~ 34%:2%:16% ~ 20%:48% ~ 52% weighed;
B mixes: by load weighted for step a Ag powder, Cu powder and W powder, loads in graphite boat after mixing, and puts into stove insulation cooling taking-up after 2 ~ 3 hours of 880 DEG C ~ 920 DEG C;
C infiltration: first pressing shaping block is emitted on graphite cake, above lay infiltration copper sheet, carry out infiltration, furnace temperature is 1180 DEG C ~ 1220 DEG C, within 8 ~ 10 minutes, pushes away half boat, and passes into hydrogen shield.
2. a kind of electrical contact as claimed in claim 1, is characterized in that: composed of the following components, and the ratio of each component is: Ag:Cu:W=28%:22%:50%.
3.
an electrical contact as claimed in claim 1, is characterized in that: described in
Silver powder: Ag%>=99.5, apparent density is 1.5 ~ 3.0 g/cm
2;
Copper powder: Cu% >=99.5;
Tungsten powder: W% >=99.9, granularity is 2.5 ~ 5.5 μ;
Copper sheet: Cu % >=99.9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310140001.1A CN103247450B (en) | 2013-04-22 | 2013-04-22 | Electrical contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310140001.1A CN103247450B (en) | 2013-04-22 | 2013-04-22 | Electrical contact |
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| Publication Number | Publication Date |
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| CN103247450A CN103247450A (en) | 2013-08-14 |
| CN103247450B true CN103247450B (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310140001.1A Expired - Fee Related CN103247450B (en) | 2013-04-22 | 2013-04-22 | Electrical contact |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103824710B (en) * | 2014-03-10 | 2015-10-28 | 温州中希电工合金有限公司 | A kind of method of silver-colored cladded wolfram carbide powder preparation silver-tungsten carbide contact material and products thereof |
| CN104078249A (en) * | 2014-05-16 | 2014-10-01 | 浙江天银合金技术有限公司 | Silver copper tungsten electrical contact and processing technology thereof |
| CN114318100A (en) * | 2021-12-13 | 2022-04-12 | 合肥工业大学 | Silver-doped tungsten-copper composite material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1022424C (en) * | 1990-12-28 | 1993-10-13 | 中南工业大学 | Spindle alloy of tungsten-copper-silver-nickel by powder metallurgy |
| WO2012076281A1 (en) * | 2010-12-06 | 2012-06-14 | Abb Research Ltd | Electrical contact element and an electrical contact |
| CN102392170B (en) * | 2011-11-11 | 2013-03-13 | 扬州乐银合金科技有限公司 | Processing method for manufacturing silver tungsten composite contact material |
| CN102522229B (en) * | 2011-12-30 | 2014-10-29 | 浙江天银合金技术有限公司 | Production process of silver-tungsten carbide and silver-nickel-copper compounded electric contact |
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