CN102737863B - Silver nickel graphite composite contact terminal material and processing method thereof - Google Patents
Silver nickel graphite composite contact terminal material and processing method thereof Download PDFInfo
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- CN102737863B CN102737863B CN201210226205.2A CN201210226205A CN102737863B CN 102737863 B CN102737863 B CN 102737863B CN 201210226205 A CN201210226205 A CN 201210226205A CN 102737863 B CN102737863 B CN 102737863B
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Abstract
The invention discloses a processing method of a silver nickel graphite composite contact terminal material, and the processing method is characterized by comprising the steps of preparing silver powder, nickel powder and graphite powder contained by the silver nickel graphite composite contact terminal material, respectively preparing the silver powder and the nickel powder into nickel nitrate solution and silver nitrate solution, placing the nickel nitrate solution and the silver nitrate solution into a reactor vessel, injecting sodium hydroxide (NaOH) solution under the blending situation, precipitating silver oxide (Ag2O) plus nickelous hydroxide (Ni(OH)2) co-precipitated powder, after the co-precipitated powder is washed, dried and reduced, graphite powder is placed in to the co-precipitated powder, and finally the silver nickel graphite composite contact terminal material is obtained through steps of wet ball milling, vacuum drying, annealing, primary press forming, sintering, re-pressing, annealing, re-pressing and surface treatment. The distribution of nickel and graphite particles in a silver substrate can be improved by utilizing chemical co-precipitation process and wet ball milling process, the physical combination strength of wet materials can be improved, and the mechanical performance, the physical performance and electric performance of the material can be improved. The metallographic structure of the material is uniform and fine, the produced contact terminal material has large density, the conductivity is greatly optimized, and the electric arc corrosion resistance can be improved.
Description
Technical field
The present invention relates to a kind of manufacturing technique method of silver-colored nickel graphite contact material of the electrical contact for the manufacture of appliance switch uses such as various breaker of plastic casing, frame universal circuit breakers.
Background technology
In low-voltage electrical apparatus electrical contact material, silver-colored nickel graphite contact material is mainly used on all kinds of breaker of plastic casing, frame universal circuit breaker.This is because this material has good resistance fusion welding and conductivity, low and stable contact resistance.The effect of graphite is the bonding and the melting welding that stop contact, and does not form any insulant and make contact resistance become large.But graphite has the inclination of stable arc and aerial poor heat stability, because existing silver-colored nickel graphite contact material does not pay attention to the technique of content of graphite and processing in the course of processing, thus arc resistant corrosive power difference is the greatest drawback of this material.At present, generally adopt powder mixing machine explained hereafter, this is simple for process, flow process is few, low for equipment requirements, stock utilization is high, production cost is low, but obtained contact uneven microstructure, compactness are poor, arc erosion rate is high.
Summary of the invention
The object of the invention is for solving existing silver-colored nickel graphite contact material above shortcomings, a kind of new silver-colored nickel graphite composite contact terminal material and processing method thereof are provided.
Technical scheme of the present invention is: silver-colored nickel graphite composite contact terminal material contains silver 65 ~ 75%, nickel 23% ~ 32%, graphite 2% ~ 3%.
The processing method of above-mentioned silver-colored nickel graphite composite contact terminal material, is characterized in that, comprise the following steps:
(1) be equipped with the silver powder of described silver-colored nickel graphite composite contact terminal material ingredient, nickel powder and graphite powder, the percentage by weight of silver powder, nickel powder and graphite powder is silver powder 65 ~ 75%, nickel powder 23% ~ 32%, graphite powder 2% ~ 3%;
(2) silver powder and nickel powder are all prepared into that concentration is 20 ~ 100g/l nickel nitrate solution, concentration is 50 ~ 300g/l liquor argenti nitratis ophthalmicus respectively;
(3) in reaction vessels, add the 20 ~ 100g/l nickel nitrate solution prepared by step (2) and 50 ~ 300g/l liquor argenti nitratis ophthalmicus, slowly spraying into concentration is under agitation 10 ~ 50g/l sodium hydroxide solution, makes the nickel ion in solution, silver ion all generates Ag
2o+Ni (OH)
2coprecipitated starch;
(4) by Ag
2o+Ni (OH)
2after coprecipitated starch wash to neutral drying, cleaning is to neutral dry, reduction again; Described baking temperature is 250 ~ 350 DEG C, and drying time is 20 ~ 25 hours; The protective atmosphere of described reduction is hydrogen or decomposed ammonia, and reduction temperature is 400 ~ 500 DEG C, and the recovery time is 3 ~ 5 hours;
(5) Ag after step (2) reduction
2o+Ni (OH)
2powder, adds the described graphite powder 2% ~ 3% of step (1), in wet mixing ball mill, carries out ball-milling treatment;
(6) by the wet-milling after step (5) ball-milling treatment through 50 ~ 100 DEG C of vacuum dryings 3 ~ 5 hours, be anneal in the atmosphere of hydrogen or decomposed ammonia at protective atmosphere, annealing temperature is 600 ~ 720 DEG C, and temperature retention time is 2 ~ 3 hours, obtained silver-colored nickel graphite mixed powder after annealing in process;
(7) to silver-colored nickel graphite mixed powder just pressing formation, first pressing formation unit pressure is 3 ~ 6T/cm
2, be 850 ~ 900 DEG C of sintering through temperature under protective atmosphere is hydrogen or decomposed ammonia protection, temperature retention time is, after 3 ~ 4 hours, anneal, and annealing temperature is 650 ~ 750 DEG C, and temperature retention time is 2 ~ 3 hours;
(8) material obtained step (7) carries out multiple repoussage shape, obtained silver-colored nickel graphite composite contact terminal material; The pressure of multiple repoussage shape is 10 ~ 12T/cm
2.
Abrading-ball in the wet mixing ball mill of step (5) described ball-milling treatment and powder weight ratio are 5 ~ 10:10, and alcohol and powder weight ratio are 2 ~ 5:10, and Ball-milling Time is 10 ~ 15 hours.
Present invention process is advanced, material mixture ratio is reasonable, (1) utilize chemical coprecipitation, wet mixing ball-milling technology can improve the distribution in silver matrix of nickel, graphite granule, improve the physical bond intensity of nonwetting storeroom, thus acquisition alloying powder, improve the mechanical performance, physical property, electrical property etc. of material.(2) metallographic structure of silver-colored nickel graphite contact material is evenly tiny, has excellent mechanical and physical performance, and the contact material density made is large, and conductance is significantly optimized, and improves arc resistant corrosive power.
Embodiment
The silver-colored nickel graphite composite contact terminal material of preparation 500kg, its technological process is: liquor argenti nitratis ophthalmicus, nickel nitrate solution → NaOH solution → Ag
2o+Ni (OH)
2→ cleaning is to neutral → oven dry → cleaning to neutrality → oven dry → reduction → wet mixing ball milling → vacuum drying → annealing in process → first pressing formation → sintering → once pressure → annealing in process → secondary presses → surface treatment → silver-colored nickel graphite composite contact terminal material again again.
Concrete technology step is as follows:
(1) be equipped with silver powder, nickel powder and the graphite powder contained by described silver-colored nickel graphite composite contact terminal material, the percentage by weight of silver powder, nickel powder and graphite powder is silver powder 65 ~ 75%, nickel powder 23% ~ 32%, graphite powder 2% ~ 3%;
(2) silver powder and nickel powder are all prepared into that concentration is 20 ~ 100g/l nickel nitrate solution, concentration is 50 ~ 300g/l liquor argenti nitratis ophthalmicus respectively;
(3) in reaction vessels, add the 20 ~ 100g/l nickel nitrate solution prepared by step (2) and 50 ~ 300g/l liquor argenti nitratis ophthalmicus, slowly spraying into concentration is under agitation 10 ~ 50g/l sodium hydroxide solution, makes the nickel ion in solution, silver ion all generates Ag
2o+Ni (OH)
2coprecipitated starch;
(4) by Ag
2o+Ni (OH)
2after coprecipitated starch wash to neutral drying, cleaning is to neutral dry, reduction again; Described baking temperature is 250 ~ 350 DEG C, and drying time is 20 ~ 25 hours; The protective atmosphere of described reduction is hydrogen or decomposed ammonia, and reduction temperature is 400 ~ 500 DEG C, and the recovery time is 3 ~ 5 hours;
(5) Ag after step (2) reduction
2o+Ni (OH)
2powder, adds the described graphite powder 2% ~ 3% of step (1), in wet mixing ball mill, carries out ball-milling treatment; Abrading-ball in the wet mixing ball mill of described ball-milling treatment and powder weight ratio are 5 ~ 10:10, and alcohol and powder weight ratio are 2 ~ 5:10, and Ball-milling Time is 10 ~ 15 hours;
(6) by the wet-milling after step (5) ball-milling treatment through 50 ~ 100 DEG C of vacuum dryings 3 ~ 5 hours, be anneal in the atmosphere of hydrogen or decomposed ammonia at protective atmosphere, annealing temperature is 600 ~ 720 DEG C, and temperature retention time is 2 ~ 3 hours, obtained silver-colored nickel graphite mixed powder after annealing in process;
(7) to silver-colored nickel graphite mixed powder just pressing formation, first pressing formation unit pressure is 3 ~ 6T/cm
2, be 850 ~ 900 DEG C of sintering through temperature under protective atmosphere is hydrogen or decomposed ammonia protection, temperature retention time is, after 3 ~ 4 hours, anneal, and annealing temperature is 650 ~ 750 DEG C, and temperature retention time is 2 ~ 3 hours;
(8) it is 10 ~ 12T/cm that the material obtained step (7) carries out pressure
2multiple pressure, annealing, then to carry out a pressure be 10 ~ 12T/cm
2after multiple pressure, carry out surface treatment, obtained silver-colored nickel graphite composite contact terminal material, this contact material contain silver, nickel, graphite percentage by weight be silver 65 ~ 75%, nickel 23% ~ 32%, graphite 2% ~ 3%.
Claims (1)
1. a processing method for silver-colored nickel graphite composite contact terminal material, is characterized in that, comprise the following steps:
(1) be equipped with the silver powder of described silver-colored nickel graphite composite contact terminal material ingredient, nickel powder and graphite powder, the percentage by weight of silver powder, nickel powder and graphite powder is silver powder 75%, nickel powder 23%, graphite powder 2%;
(2) silver powder and nickel powder are all prepared into that concentration is 20 ~ 100g/l nickel nitrate solution, concentration is 50 ~ 300g/l liquor argenti nitratis ophthalmicus respectively;
(3) in reaction vessels, add the 20 ~ 100g/l nickel nitrate solution prepared by step (2) and 50 ~ 300g/l liquor argenti nitratis ophthalmicus, slowly spraying into concentration is under agitation 10 ~ 50g/l sodium hydroxide solution, makes the nickel ion in solution, silver ion all generates Ag
2o+Ni (OH)
2coprecipitated starch;
(4) by Ag
2o+Ni (OH)
2after coprecipitated starch wash to neutral drying, cleaning is to neutral dry, reduction again; Baking temperature is 250 ~ 350 DEG C, and drying time is 20 ~ 25 hours; The protective atmosphere of described reduction is hydrogen or decomposed ammonia, and reduction temperature is 400 ~ 500 DEG C, and the recovery time is 3 ~ 5 hours;
(5) Ag after step (4) reduction
2o+Ni (OH)
2powder, adds the described graphite powder 2% of step (1), in wet mixing ball mill, carries out ball-milling treatment; Abrading-ball in wet mixing ball mill and powder weight ratio are 5:10 ~ 10:10, and alcohol and powder weight ratio are 2:10 ~ 5:10, and Ball-milling Time is 10 ~ 15 hours;
(6) by the wet-milling after step (5) ball-milling treatment through 50 ~ 100 DEG C of vacuum dryings 3 ~ 5 hours, be anneal in the atmosphere of hydrogen or decomposed ammonia at protective atmosphere, annealing temperature is 720 DEG C, and temperature retention time is 3 hours, obtained silver-colored nickel graphite mixed powder after annealing in process;
(7) to silver-colored nickel graphite mixed powder just pressing formation, first pressing formation unit pressure is 3 ~ 6T/cm
2, be 850 ~ 900 DEG C of sintering through temperature under protective atmosphere is hydrogen or decomposed ammonia protection, temperature retention time is, after 4 hours, anneal, and annealing temperature is 750 DEG C, and temperature retention time is 3 hours;
(8) material obtained step (7) carries out multiple repoussage shape, obtained silver-colored nickel graphite composite contact terminal material; The pressure of multiple repoussage shape is 10 ~ 12T/cm
2.
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| CN201210226205.2A CN102737863B (en) | 2012-07-03 | 2012-07-03 | Silver nickel graphite composite contact terminal material and processing method thereof |
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| CN102737863B true CN102737863B (en) | 2015-01-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104493170A (en) * | 2014-12-30 | 2015-04-08 | 桂林电器科学研究院有限公司 | Preparation method of flakey or rivet-shaped silver and tungsten electrical contact material |
| CN104525968A (en) * | 2014-12-30 | 2015-04-22 | 桂林电器科学研究院有限公司 | Flaky silver-tungsten electrical contact material preparation method |
| CN104439249A (en) * | 2014-12-30 | 2015-03-25 | 桂林电器科学研究院有限公司 | Method for processing sheet silver nickel electric contact material |
| CN108054031B (en) * | 2017-09-11 | 2019-10-25 | 大连大学 | A kind of sheet iron reticulates the Ag-based electrical contact material of distribution reinforcing |
| CN112501464B (en) * | 2020-11-18 | 2021-11-09 | 中国科学院金属研究所 | Silver-nickel composite material and preparation method thereof |
| CN113245547B (en) * | 2021-04-23 | 2022-06-10 | 浙江福达合金材料科技有限公司 | Preparation method of silver-nickel graphite electrical contact with continuous decarburized layer on side surface |
| CN115483049A (en) * | 2022-09-20 | 2022-12-16 | 苏州西门子电器有限公司 | Preparation method and preparation system of silver graphite contact |
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| CN1555074A (en) * | 2003-12-23 | 2004-12-15 | 哈尔滨东大电工有限责任公司 | Electric contact material for low voltage electric appliance |
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