CN101332512B - Preparation method of chromium powder for producing copper-chromium contact - Google Patents
Preparation method of chromium powder for producing copper-chromium contact Download PDFInfo
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- CN101332512B CN101332512B CN2008100637762A CN200810063776A CN101332512B CN 101332512 B CN101332512 B CN 101332512B CN 2008100637762 A CN2008100637762 A CN 2008100637762A CN 200810063776 A CN200810063776 A CN 200810063776A CN 101332512 B CN101332512 B CN 101332512B
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Abstract
The invention relates to a preparation method of chromium powder for manufacturing a copper-chromium contact. The preparation method mainly comprises the steps as follows: selection of raw chromium block, coarse crushing, vortex fine crushing, vacuum ball milling and vibrating sieving and obtaining the chromium powder; the coarse crushing is carried out by a special hydraulic coarse crusher with a water cooling plant in a room which is provided with an air conditioner and a dehumidifier, after the coarse crushing, the largest particle diameter is less than 3mm, the chromium can be effectively prevented from heating and oxidation in the course of the coarse crushing, the vortex fine crushing is carried out in a closed system which consists of an automatic feeder, a turbo-mill, a powder collector, a vacuum pump, an argon inlet and a cooler, after the vortex fine crushing, the chromium powder is put into a vacuum ball mill for ball milling with the ball-material ratio being 2:1-3:1, the rotary speed of the ball mill is controlled to ensure that the material ball is in a rolling state, and the ball milling time is 91-101 hours. The preparation method has the advantages that the quality of the chromium powder is stable, the production efficiency is high, the energy consumption is low, the powder yield is high, etc.
Description
Technical field
What the present invention relates to is a kind of chromium powder manufacture method that is exclusively used in the vacuum switch copper-chromium contact material, belongs to the processing technique field of metal material.
Background technology
Copper chromium contact has good electrical and thermal conductivity performance, lower shut off value, higher proof voltage level, good arc resistant ablation and excellent anti-melting welding ability, thereby has obtained a large amount of uses in the manufacturing of mesohigh vacuum switch tube.The granular size of chromium powder, shape and oxygen, nitrogen content are the principal elements that influences the copper chromium contact performance.At present the chromium powder that uses in copper chromium contact is produced adopts the manufacturing of standard machinery comminuting method, and grain shape is irregular, the particle size distribution broad, oxygen, nitrogen content are higher, thus cause oxygen in the copper-chromium contact material, nitrogen is higher and microcosmic under copper chromium skewness.The chromium powder of electrolysis manufacturing is owing to production cost and oxygen content is too high does not have to use in the production of copper chromium contact.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, and a kind of efficient preparation method feasible, that can satisfy the chromium powder for producing copper-chromium contact of copper chromium contact premium properties is provided.
The objective of the invention is to finish by following technical solution, described chromium powder preparation technology flow process comprises: raw material chromium piece, coarse crushing, eddy current are in small, broken bits, vacuum ball milling, vibration screening, chromium powder; Described coarse crushing process is to carry out in the room that air-conditioning and dehumidifier are housed, and uses the hydraulic pressure boulder crusher of special-purpose band water cooling plant to carry out coarse crushing, and the largest particles diameter after the coarse crushing is less than 3mm; It can effectively avoid chromium heating, oxidation in the coarse crushing process.
Described eddy current is in small, broken bits to be to carry out in the closed system of being made up of automatic feeder, turbine type pulverizer, powder collector, vavuum pump, argon gas import and cooler; it can guarantee that chromium powder is not oxidized; abrading block in the turbine type pulverizer is made with steel bonded carbide; vavuum pump is used for pulverizing the front-seat air that removes in the system; the protective gas of argon gas when pulverizing, cooler is used for taking away the heat that produces when pulverizing.
The present invention is the ball milling in the vacuum sphere grinding machine of packing into of the chromium powder after in small, broken bits with eddy current, ratio of grinding media to material=(2-3): 1, the control drum's speed of rotation makes pellet be in rolling condition, and the ball milling time was at 96 ± 5 hours.
Chromium powder behind the vacuum ball milling is carried out vibration screening, and after screening, it is in small, broken bits that+120 purpose chromium powders turn back to eddy current, and-200 purpose chromium powders are used for other occasion (as the manufacturing of diamond), and-120～+ 200 purpose chromium powders are used for making contact material of vacuum switch.
The present invention can mix with the copper powder desired proportions-120～+ 200 order hafnium metal powfers that prepare under vacuum, suppress, sintering, multiple pressure, resintering and subsequent treatment again, makes the vacuum switch contact material.
The chromium piece disintegrating process that the present invention adopts can not increase by 0, impurity such as N, AI, Si, S, P in crushing process; The chromium powder particle is spherical in shape, particle size distribution :-120～+ 200 orders account for more than 85%, and surplus is-200 orders; The chromium powder that uses chromium powder technology of preparing of the present invention to make is used powder metallurgical technique, and as sintering or infiltration process, the copper chromium contact of producing has advantages such as electrical conductivity height, even tissue, anti-melting welding and arc resistant ablation.
The present invention compared with prior art has following technique effect: the one, chromium powder steady quality, production efficiency height, energy consumption be low, powder rate height; The 2nd, controlled with the chromium powder particle size distribution that chromium powder technology of preparing of the present invention is made, grain shape is spherical in shape; The 3rd, can not increase oxygen, nitrogen content and other objectionable impurities of chromium powder with chromium powder technology of preparing of the present invention; The 4th, the chromiumcopper that mixes with copper powder, obtains after compacting, sintering and the follow-up densification with the chromium powder of chromium powder technology of preparing of the present invention manufacturing has density height, even tissue, electrical conductivity height, resistance fusion welding can be good.
The specific embodiment
The present invention will be described in detail below in conjunction with specific embodiment:
The chromium piece composition that the present invention uses is as follows:
| Main component % | Cr | Fe | Si | Al | S | C | P | O | N |
| The chromium piece | 99.80 | 0.049 | 0.018 | 0.018 | 0.005 | 0.006 | 0.0011 | 0.025 | 0.0012 |
Chromium powder preparation technology flow process of the present invention is as follows: raw material chromium piece → coarse crushing → eddy current is in small, broken bits → and vacuum ball milling → vibration screening → chromium powder.
For fear of the heating of chromium in the coarse crushing process, oxidation, coarse crushing process of the present invention is to carry out in the room that air-conditioning and dehumidifier are housed, and uses the hydraulic pressure boulder crusher of special-purpose band water cooling plant to carry out coarse crushing, and the largest particles diameter after the coarse crushing is less than 3mm.
Eddy current is in small, broken bits to be to carry out in the closed system of being made up of automatic feeder, turbine type pulverizer, powder collector, vavuum pump, argon gas import and cooler; can guarantee that chromium powder is not oxidized; abrading block in the turbine type pulverizer is made with steel bonded carbide; vavuum pump is used for pulverizing the front-seat air that removes in the system; the protective gas of argon gas when pulverizing, cooler is used for taking away the heat that produces when pulverizing.
Chromium powder with eddy current after the in small, broken bits ball milling in the vacuum sphere grinding machine of packing into, ratio of grinding media to material=(2-3): 1, the control drum's speed of rotation makes pellet be in rolling condition, and the ball milling time was at 96 ± 5 hours.
Chromium powder behind the vacuum ball milling is sieved, and it is in small, broken bits that+120 purpose chromium powders turn back to eddy current, and-200 purpose chromium powders are used for other occasion (as the manufacturing of diamond), and-120～+ 200 purpose chromium powders are used for making contact material of vacuum switch.
Under vacuum, mix with the copper powder desired proportions with above-mentioned-120～+ 200 order hafnium metal powfers that prepare, suppress again, sintering, multiple pressure, resintering and subsequent treatment, make the vacuum switch contact material.
Embodiment
Technological process of the present invention comprises: raw material chromium piece → coarse crushing → eddy current is in small, broken bits → and vacuum ball milling → vibration screening → chromium powder;
1, takes by weighing the chromium piece 20kg of (as composition as described in 5.1) aforementioned composition.
2, above-mentioned 20kg chromium piece is put into the water-cooled hydraulic boulder crusher and carry out coarse crushing, the largest particles diameter after the coarse crushing gets weight 19.95kg in fact less than 3mm.
3, it is in small, broken bits to place the turbine type pulverizer to carry out less than the thin chromium grain of 3mm above-mentioned 19.95kg diameter ,-100 purpose chromium powder 19.75kg.
4, above-mentioned 19.75kg-100 purpose chromium powder is put into vacuum sphere grinding machine ball milling, ratio of grinding media to material=2.5: 1, the control drum's speed of rotation makes pellet be in rolling condition, and the ball milling time is 96 hours.
5, the powder behind the ball milling is sieved, 1.85kg+120 purpose chromium powder can return use, and-200 purpose chromium powder 2.75kg deposit in addition and do other application, gets the spherical chromium powder 15.1kg of-120～+ 200 orders; The recovery rate of chromium powder is 98.5%, and the chromium powder recovery rate that can be used for producing copper chromium contact is 75.5%.
6, the 15.1kg chromium powder to above-mentioned gained carries out particle size distribution, and the powder in-120～+ 200 order particle size ranges accounts for more than 85%.
7, the spherical chromium powder of above-mentioned 15.1kg-120～+ 200 orders mixed with-100 order electrolytic copper powders that 15.1kg reduces, compacting, sintering, answer pressure, resintering and subsequent treatment, make the CuCr50 contact material, this contact material has density height, even tissue, electrical conductivity height, resistance fusion welding and can wait advantage, its performance to satisfy the performance requirement of vacuum switch to contact material fully well.
8, the chromium powder that makes is carried out chemical composition analysis, the result is as follows:
| Main component % | Cr | Fe | Si | Al | S | C | P | O | N |
| Chromium powder | 99.80 | 0.051 | 0.018 | 0.018 | 0.005 | 0.006 | 0.0011 | 0.025 | 0.0012 |
Other embodiment of the present invention, those skilled in the art can select arbitrarily to obtain in aforementioned range by the understanding of the foregoing description or the technology that obtains are enlightened.Therefore protection scope of the present invention is not limited to the scope of the foregoing description, and all by understanding of the present invention, any technical replacement that can access all belongs within protection scope of the present invention.
Claims (3)
1. the preparation method of a chromium powder for producing copper-chromium contact is characterized in that, this method comprises following operation: prepare that raw material chromium piece, coarse crushing, eddy current are in small, broken bits, vacuum ball milling, vibration screening, make chromium powder; Described coarse crushing process is to carry out in the room that air-conditioning and dehumidifier are housed, and uses the hydraulic pressure boulder crusher of special-purpose band water cooling plant to carry out coarse crushing, and the largest particles diameter after the coarse crushing is less than 3mm; Described eddy current is in small, broken bits to be to carry out in the closed system of being made up of automatic feeder, turbine type pulverizer, powder collector, vavuum pump, argon gas import and cooler; abrading block in the turbine type pulverizer is made with steel bonded carbide; vavuum pump is used for pulverizing the front-seat air that removes in the system; the protective gas of argon gas when pulverizing, cooler is used for taking away the heat that produces when pulverizing.
2. the preparation method of chromium powder for producing copper-chromium contact according to claim 1, it is characterized in that with eddy current chromium powder after the in small, broken bits ball milling in the vacuum sphere grinding machine of packing into, ratio of grinding media to material=3: 1, control drum's speed of rotation, make pellet be in rolling condition, the ball milling time was at 96 hours.
3. the preparation method of chromium powder for producing copper-chromium contact according to claim 2, it is characterized in that the chromium powder behind the vacuum ball milling is carried out vibration screening, after screening, it is in small, broken bits that+120 purpose chromium powders turn back to eddy current,-200 purpose chromium powders are used for other occasion, and-120～+ 200 orders are used for making contact material of vacuum switch.
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| CN2008100637762A CN101332512B (en) | 2008-07-29 | 2008-07-29 | Preparation method of chromium powder for producing copper-chromium contact |
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| CN101332512B true CN101332512B (en) | 2011-03-30 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102784919A (en) * | 2011-05-16 | 2012-11-21 | 湖南省益浩新材料有限公司 | Method for preparing high-purity superfine chromium powder |
| CN102489374A (en) * | 2011-12-09 | 2012-06-13 | 云南铜业科技发展股份有限公司 | Process for producing crude selenium powder |
| CN104070171B (en) * | 2014-06-12 | 2016-03-16 | 陕西斯瑞工业有限责任公司 | A kind of preparation method of ultrafine chromium powder |
| CN106350683A (en) * | 2016-08-31 | 2017-01-25 | 陕西斯瑞新材料股份有限公司 | Method for preparing CuCr contact materials by means of vacuum self-consuming arc melting |
| CN109182833B (en) * | 2018-08-28 | 2020-11-06 | 合肥工业大学 | Copper-based powder metallurgy pantograph pan material taking spherical chromium powder as strengthening phase and preparation method thereof |
| CN110014158A (en) * | 2019-04-22 | 2019-07-16 | 西安斯瑞先进铜合金科技有限公司 | A kind of method that aerosolization prepares spherical chromium powder |
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| CN2173656Y (en) * | 1993-04-12 | 1994-08-10 | 杨木苍 | Water cooling structure of disintegrator |
| CN1227202A (en) * | 1998-12-18 | 1999-09-01 | 锦州铁合金工商实业公司冶金建材厂 | Technical process for producing refractory material Al-Cr brick by using chromium smelting sludge |
| CN1410206A (en) * | 2001-09-21 | 2003-04-16 | 吴庆林 | Metallic aluminium powder deep processing technology |
| CN101125367A (en) * | 2007-09-26 | 2008-02-20 | 西安理工大学 | Mechanical alloyed method for manufacturing CrW alloy powder |
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