CN103394700B - The prealloy diffusion method of production tin bronze powder - Google Patents
The prealloy diffusion method of production tin bronze powder Download PDFInfo
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- CN103394700B CN103394700B CN201310365219.7A CN201310365219A CN103394700B CN 103394700 B CN103394700 B CN 103394700B CN 201310365219 A CN201310365219 A CN 201310365219A CN 103394700 B CN103394700 B CN 103394700B
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Abstract
The invention discloses a kind of prealloy diffusion method of producing tin bronze powder, it comprises the steps: that 86% ~ 90%-200 order water atomization pure copper powder ,-300 order zinc powders of 5% ~ 7% and-300 order glass puttys of 5% ~ 7% are put into V-type mixing machine to be mixed, add lithium stearate and 15% ~ 25% steel ball in mixed process and carry out conjunction batches 50 ~ 70 minutes, box atmosphere furnace diffusion-sintering is adopted, sintering temperature 450 DEG C, 30 minutes diffusion-sintering time after mixing.After have employed this method, good stability in production process, be easy to shaping, sintered dimensions is easy to control, without lamination, the crushing strength after goods sintering is good, the applied range of finished product.
Description
Technical field
The present invention relates to the prealloy diffusion method of production tin bronze powder, the prealloy diffusion method of especially a kind of production 660 tin bronze powder.
Background technology
660 tin bronze powder refer to copper to be matrix, the copper alloy powder being main adding elements with 5% to 7% zinc ﹑ 5% to 7% tin.Along with the fast development of powder metallurgy, application in the industry is at present more and more extensive.660 tin bronze powder at present mainly for the manufacture of oiliness bearing (self-lubricating bearing), high-grade diamond tool, powder metallurgy sintered steel cement copper, incrustation (surface of steel, wood-based product) etc.Produce at present that 660 tin bronze powder mainly adopt hybrid technique, atomized alloy technique two kinds of modes of production are produced in the world, because the difference of technique, the performance of 660 tin bronze powder therefore produced also is distinguished to some extent, through investigation and the experimental analysis in market, the technique of producing 660 tin bronze powder respectively has pluses and minuses, 660 tin bronze powder of wherein water atomization explained hereafter are owing to have employed water as atomizing medium, and the cooling velocity of water atomization is higher than the cooling velocity of common gas atomization.Advantage is cheap, and quenching is effective.Shortcoming is that the oxygen content of the powder of gained is higher, and the 660 tin bronze powder apparent densitys adopting water atomization to produce are high, are unfavorable for the shaping of powder, and 660 tin bronze powder therefore adopting water atomization to produce are very restricted in application aspect; 660 tin bronze powder that mixing method is produced, intensity is relatively low, shrinkage factor inconvenience controls, and therefore promotes difficulty in high-end market comparatively large, and the powder prepared of mixing method is due to the density of raw material, granularity and shape difference, inevitably vibrate in shaping or transportation, cause powder local to occur segregation phenomena, affect properties of product, because which limit the large-scale production of enterprise, be unfavorable for the efficiency improving enterprise's production.
Summary of the invention
The method that the object of the invention is to solve existing production 660 tin bronze powder is unfavorable for the shaping problem of powder.
The technical solution used in the present invention is: the prealloy diffusion method of production tin bronze powder, it comprises the steps: that 86% ~ 90%-200 order water atomization pure copper powder ,-300 order zinc powders of 5% ~ 7% and-300 order glass puttys of 5% ~ 7% are put into V-type mixing machine to be mixed, add lithium stearate and 15% ~ 25% steel ball in mixed process and carry out conjunction batches 50 ~ 70 minutes, box atmosphere furnace diffusion-sintering is adopted, sintering temperature 450 DEG C, 30 minutes diffusion-sintering time after mixing.
As a further improvement on the present invention, 88%-200 order water atomization pure copper powder ,-300 order zinc powders of 6% and-300 order glass puttys of 6% are put into V-type mixing machine and mixes, in mixed process, add the lithium stearate of 1% and the steel ball of 20% carry out conjunctions and criticize 60 minutes.
The beneficial effect that the present invention adopts is: after have employed this method, good stability in production process, be easy to shaping, sintered dimensions is easy to control, without lamination, the crushing strength after goods sinter is good, the applied range of finished product.
Detailed description of the invention
The present invention is described further below.
The general embodiment of the present invention: the prealloy diffusion method of production tin bronze powder, it comprises the steps: that 90%-200 order water atomization pure copper powder ,-300 order zinc powders of 5% and-300 order glass puttys of 5% are put into V-type mixing machine to be mixed, add lithium stearate and 15% steel ball in mixed process and carry out conjunction batches 50 minutes, box atmosphere furnace diffusion-sintering is adopted, sintering temperature 450 DEG C, 30 minutes diffusion-sintering time after mixing.
Preference of the present invention: the prealloy diffusion method of production tin bronze powder, it comprises the steps: that 88%-200 order water atomization pure copper powder ,-300 order zinc powders of 6% and-300 order glass puttys of 6% are put into V-type mixing machine to be mixed, in mixed process, add the lithium stearate of 1% and the steel ball of 20% carry out conjunctions and criticize 60 minutes, box atmosphere furnace diffusion-sintering is adopted, sintering temperature 450 DEG C, 30 minutes diffusion-sintering time after mixing.
The effect of-200 order water atomization pure copper powder in the present invention: in prealloy diffusion technique, copper, tin, zinc powder granule, under the effect of high temperature, to be reunited, the situation of particle growth.Through our test ,-200 order water atomization pure copper powder at high temperature spread, and through diffusion technique, degree of growing up, 50%, reaches the requirement of finished product.
The effect of V-type mixing machine in the present invention: save enterprise's production cost, make production product mechanical property reach optimization, thus produce 660 more excellent tin bronze powder products.
The effect of-300 order zinc powders and-300 order glass puttys in the present invention: in prealloy diffusion technique, because the ratio difference of zinc powder, glass putty and copper powder is apart from very big, if want to reach mixing of relative particle uniform amount in prealloy diffusion, then require zinc powder, degree that the quantity of glass putty reaches copper powder.Therefore zinc powder, powder particles demand are little, reach close quantity.
The effect of lithium stearate in mixed process in the present invention: lithium stearate belongs to organic salt, foamy white material, the surface of powder can be bonded in the process of copper powder, zinc powder, glass putty mixing, strengthen the cementability of powder surface, impel powder granule to bond together better, reduce the phenomenon occurring segregation in the process of transport.Through test of many times research, when the addition of lithium stearate is 1% time, the most obvious, the anti-segregation effect of adhesive effect is best, and the lithium stearate effect promoting of more than 1% is not obvious.
The effect of steel ball in mixed process in the present invention: in hybrid technique process, we adopt steel ball to be mainly used for breaking in copper powder, zinc powder, glass putty mixed process because the large-scale particle of bonding formation.The effect of steel ball is conducive to the effect improving copper powder, zinc powder, glass putty mixing, reduces the probability of copper powder, zinc powder, the large-scale dough generation of glass putty.When steel ball content accounts for gross mass less than 15%, abundant broken powder granule group effect cannot be reached, powder homogenising degree is affected, when steel ball content accounts for gross mass more than 20%, the effect promoting of the broken powder granule group that steel ball plays is not obvious, considers, from the angle of entreprise cost and production operation convenience degree when the addition that test of many times research finds steel ball is 20%, crushing effect is the most obvious, is convenient to the carrying out produced most.
The determination of incorporation time of the present invention: when incorporation time is greater than 60 minutes, be unfavorable for the carrying out produced, when incorporation time is less than 60 minutes, mixed effect is not obvious.
In diffusion-sintering process of the present invention; when fusing point (231.9 DEG C) of diffusion temperature lower than tin;-solid solution mechanism is mainly spread in the formation of partially-alloyed powder; wherein Zn is because of its highly volatile; High temperature diffusion under protective atmosphere, extremely with in powder, the oxygen of copper particle surface reacts; remove impurity, promote the carrying out of diffusion.When alloy phase at solution of tin to copper particle, after zinc particle infiltration reaches capacity, separate out at copper powder and zinc particle surface in situ with the form of solid phase alloy, and be closely linked with copper powder zinc powder, rely on diffusion-solid solution machine-processed.When under the effect of temperature at driving force, Cu, Sn, Zn tri-kinds of powder particles to the counterdiffusion of granule interior phase, forming section alloying powder.When diffusion temperature is higher than zinc fusing point (419.5 DEG C), two kinds of mechanism exist simultaneously, but mainly carry out with fusing-dissolving-precipitation mechanism, and what now Sn can be preferential produces alloy phase, phase counterdiffusion between homophase element with Zn.Meanwhile, copper, to tin zinc solution diffusion dissolution, forms ternary alloy three-partalloy phase.After alloy phase reaches capacity in tin zinc solution, then rely on diffusion-solid solution mechanism, tin Zn-ef ficiency continues to copper powder particle diffusion inside, to improve alloying level.Through test, diffusion 660 tin bronze powder 30 minutes diffusion-sintering time under 450 degree that prealloy diffusion technique is produced, the disperse state of product requirement can be reached, and be beneficial to the carrying out of production most.
660 tin bronze powder processing performances are spread for prealloy, need the checking carrying out product, by different process produce 660 tin bronze powder make 3 groups of rings, 6 groups of cylinders carry out test mechanical property, specifically see the following form
The crushing strength that 660 tin bronze powder adopting prealloy diffusion method to produce make product reaches more than 27MPa, far away higher than professional standard 18MPa; 660 tin bronze powder make the stable contraction rate of product within 6 ‰.Shrinkage factor rate of change is more stable, and product changing value is less; 660 tin bronze powder make the oil content 25% of product far above professional standard.
Box atmosphere furnace service condition: what adopt in production is QFL series atmosphere furnace, main reducing atmosphere, the ammonia dissolving atmosphere adopted.Rated temperature is respectively 1300 DEG C, size of burner hearth D × W × H(400 × 300 × 300mm).In the diffusion 660 tin bronze powder sintering process that prealloy diffusion technique is produced, be laid in burner hearth by the powder mixed, THICKNESS CONTROL, at 5 ~ 7cm, is conducive to the carrying out of spreading.
By comparing the performance of mixed powder, atomized powder and diffusion pre-alloyed powder three kinds of powder, find the advantage of the comprehensive mixed powder of diffusion pre-alloyed powder, atomized powder, the performance of powder is further enhanced.The diffusion 660 tin bronze powder partially alloyed powder art that the inventive method is produced has the irregular feature of atomized powder, compares with atomized powder, has the features such as low pine ratio, high fluidity, compares, have high fluidity with mixed powder.The diffusion pre-alloyed powder that this technique is developed is very suitable for the manufacture of high accuracy, low-noise micro-size, high rotating speed oil bearing.The 660 tin bronze powder compact strengths that the inventive method is produced are higher, homogeneity of ingredients, and briquettability is good, the sintering strength of pressed compact is also higher, control the change of pressed compact sintered dimensions, are of great practical significance in precise miniature bearing production process.During copper tin mixing briquet sintering, its size may be grown up, and can shrink phenomenon during prealloy powder briquet sintering.Prealloy diffusion technique overcomes the limitation of mixed powder and complete alloyed powder, combine coalescent for the segregation-free of easy for mixing method formability and complete alloyed powder, thus use compacting-sintering process can produce high strength, high tenacity, stablize the powder metallurgical component of mechanical property, be an important breakthrough of Powder Metallurgy Industry.For the 660 tin bronze powder performances that checking the inventive method is produced, 660 tin bronze powder of employing three kinds of explained hereafter compare by we.The 660 tin bronze powder performance compacting products being three kinds of different process are produced as shown in the table compare.
In sum, after have employed this method, be easy to shaping in production process, sintered dimensions is easy to control, without lamination, the crushing strength after goods sintering is good, the good stability of finished product, applied range.
Those skilled in the art should know; protection scheme of the present invention is not limited only to the above embodiments; various permutation and combination and conversion can also be carried out on the basis of above-described embodiment; under the prerequisite without prejudice to spirit of the present invention, the various conversion that the present invention carries out all are dropped in protection scope of the present invention.
Claims (1)
1. the prealloy diffusion method of production tin bronze powder, it is characterized in that it comprises the steps: that-200 order water atomization pure copper powder ,-300 order zinc powders of 6% and-300 order glass puttys of 6% of 88% are put into V-type mixing machine and mixed, in mixed process, add the lithium stearate of 1% and the steel ball of 20% carry out conjunctions and criticize 60 minutes, box atmosphere furnace diffusion-sintering is adopted, sintering temperature 450 DEG C, 30 minutes diffusion-sintering time after mixing.
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| CN105057681B (en) * | 2015-07-29 | 2018-03-30 | 昆山德泰新材料科技有限公司 | A kind of preparation method of tungsten-copper-nickel alloy powder |
| CN105033270A (en) * | 2015-08-18 | 2015-11-11 | 昆山德泰新材料科技有限公司 | Preparation method of porous copper-tin alloy powder |
| CN105382253B (en) * | 2015-12-10 | 2018-01-30 | 湖南省天心博力科技有限公司 | A kind of production method for being pre-mixed the bronze of copper and tin 10 |
| CN109500399A (en) * | 2018-12-10 | 2019-03-22 | 广东省材料与加工研究所 | A kind of preparation method of copper-based oiliness bearing |
| CN110102771B (en) * | 2019-03-25 | 2023-05-26 | 安徽鑫佳铜业有限公司 | Preparation method of high-green-body high-stability environment-friendly diffusion type tin-zinc copper powder |
| CN111331129A (en) * | 2020-04-26 | 2020-06-26 | 杭州屹通新材料股份有限公司 | Preparation method of CuSn10 powder with low apparent density |
| CN113878123B (en) * | 2021-04-15 | 2023-06-23 | 芜湖松合新材料科技有限公司 | Preparation method of high-quality copper-tin powder |
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| KR100305327B1 (en) * | 1998-12-31 | 2001-11-22 | 배창환 | Diffusion bronze powder manufacturing method for precision parts manufacturing |
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| CN1345643A (en) * | 2000-09-26 | 2002-04-24 | 湖南省顶立新材料工程中心有限公司 | Method for producing Cu-Sn10 alloy powder |
| CN101696478A (en) * | 2009-10-23 | 2010-04-21 | 吴棕洋 | Lead-free copper-based alloy powder material and preparation method thereof |
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Owner name: ANHUI MINGYUE XINTONG POWDER NEW MATERIAL HIGH-TEC Free format text: FORMER OWNER: TONGLING ZHUOCHENG METAL POWDER NEW MATERIAL TECHNOLOGY CO., LTD. Effective date: 20150730 |
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Effective date of registration: 20150730 Address after: The three economic and Technological Development Zone in Anhui province Tongling City Road 244000 No. 892 Applicant after: Tongling Zhuocheng Metal Powder New Material Technology Co., Ltd. Address before: The three economic and Technological Development Zone in Anhui province Tongling City Road 244000 No. 892 Applicant before: Tongling Zhuocheng Metal Powder New Material Technology Co., Ltd. |
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