CN103394700A - Pre-alloyed diffusion method for producing tin bronze powder - Google Patents
Pre-alloyed diffusion method for producing tin bronze powder Download PDFInfo
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- CN103394700A CN103394700A CN2013103652197A CN201310365219A CN103394700A CN 103394700 A CN103394700 A CN 103394700A CN 2013103652197 A CN2013103652197 A CN 2013103652197A CN 201310365219 A CN201310365219 A CN 201310365219A CN 103394700 A CN103394700 A CN 103394700A
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Abstract
The invention discloses a pre-alloyed diffusion method for producing tin bronze powder. The method comprises the steps as follows: 86%-90% of water atomized pure copper powder smaller than 200 meshes, 5%-7% of zinc powder smaller than 300 meshes and 5%-7% of tin powder smaller than 300 meshes are placed in a V-shaped blending machine for mixing; during a mixing process, lithium stearate and 15%-25% of steel balls are added and blended for 50-70 minutes; and after the mixing is performed, a box type atmosphere furnace is adopted for diffusion sintering at the temperature of 450 DEG C for 30 minutes. With the adoption of the method, during a production process, the stability is good, the forming is easy, the sintering size is easy to control, the layering phenomenon is prevented, the crushing strength of the sintered product is good, and the application range of the finished product is wide.
Description
Technical field
The present invention relates to produce the prealloy diffusion method of 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 take copper as matrix, and take 5% to 7% zinc ﹑ 5% to 7% tin is the copper alloy powder of main adding elements.Along with the fast development of powder metallurgy, present application in the industry is more and more extensive.660 tin bronze powder are 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.Producing in the world at present 660 tin bronze powder mainly adopts hybrid technique, two kinds of modes of production of atomized alloy technique to produce, because the difference of technique, the performance of the 660 tin bronze powder of therefore producing is difference to some extent also, investigation and experimental analysis through 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 having adopted 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 powder of gained is higher, and the 660 tin bronze powder apparent densitys that adopt water atomization to produce are high, are unfavorable for the moulding of powder, and the 660 tin bronze powder that therefore adopt water atomization to produce are very restricted in application facet; The 660 tin bronze powder that mixing method is produced, intensity is relatively low, shrinkage factor inconvenience is controlled, and therefore in high-end market, promotes difficulty larger, and the powder for preparing of mixing method is due to the density of raw material, granularity and shape difference, inevitably vibration, cause the powder part segregation phenomena to occur in shaping or transportation, affects properties of product, therefore limit the large-scale production of enterprise, be unfavorable for improving the efficiency that enterprise produces.
Summary of the invention
The objective of the invention is to solve the problem that existing method of producing 660 tin bronze powder is unfavorable for the moulding of powder.
The technical solution used in the present invention is: the prealloy diffusion method of producing the tin bronze powder, it comprises the steps: that-300 order glass puttys of 86%～90%-200 order water atomization pure copper powder, 5%～7%-300 order zinc powders and 5%～7% are put into to the V-type mixing machine to be mixed, in mixed process, interpolation lithium stearate and 15%～25% steel ball close and criticized 50～70 minutes, after mixing, adopt box atmosphere furnace diffusion-sintering, 450 ℃ of sintering temperatures, 30 minutes diffusion-sintering time.
As a further improvement on the present invention ,-200 order water atomization pure copper powder by 88%, 6%-300 order zinc powders and 6%-300 order glass puttys are put into the V-type mixing machine and are mixed, and the steel ball that adds 1% lithium stearate and 20% in mixed process closes batches 60 minutes.
The beneficial effect that the present invention adopts is: after having adopted this method, good stability in production process, be easy to moulding, sintered dimensions easy to control, without lamination, the crushing strength after the goods sintering is good, the applied range of finished product.
The specific embodiment
Below the present invention is described further.
The general embodiment of the present invention: the prealloy diffusion method of producing the tin bronze powder, it comprises the steps: that-300 order glass puttys of 90%-200 order water atomization pure copper powder, 5%-300 order zinc powders and 5% are put into to the V-type mixing machine to be mixed, in mixed process, interpolation lithium stearate and 15% steel ball close and criticized 50 minutes, after mixing, adopt box atmosphere furnace diffusion-sintering, 450 ℃ of sintering temperatures, 30 minutes diffusion-sintering time.
Preference of the present invention: the prealloy diffusion method of producing the tin bronze powder, it comprises the steps: that-300 order glass puttys of 88%-200 order water atomization pure copper powder, 6%-300 order zinc powders and 6% are put into to the V-type mixing machine to be mixed, the steel ball that adds 1% lithium stearate and 20% in mixed process closes batches 60 minutes, after mixing, adopt box atmosphere furnace diffusion-sintering, 450 ℃ of sintering temperatures, 30 minutes diffusion-sintering time.
The effect of-200 order water atomization pure copper powder in the present invention: in the prealloy diffusion technique, copper, tin, zinc powder body particle under the effect of high temperature, the situation of can reunite, particle being grown up.Through our test ,-200 order water atomization pure copper powder at high temperature spread, and through diffusion technique, the 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, thereby 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 the prealloy diffusion technique, because the ratio difference of zinc powder, glass putty and copper powder is apart from very big, if want to reach in prealloy diffusion amounts of particles relatively, mix uniformly, require the quantity of zinc powder, glass putty to reach the degree of copper powder.Therefore zinc powder, glass putty particle demand are little, reach close quantity.
The effect of lithium stearate in mixed process in the present invention: lithium stearate belongs to organic salt, the foam-like whiteness, in the process that copper powder, zinc powder, glass putty mix, can be bonded in the surface of powder, strengthen the cementability of powder surface, impel powder granule to bond together better, reduce the phenomenon that occurs segregation in the process of transportation.Through test of many times research, 1% the time, adhesive effect the most obviously, anti-segregation effect is best when the addition of lithium stearate, and the lithium stearate effect promoting more than 1% is not obvious.
The effect of steel ball in mixed process in the present invention: in the hybrid technique process, we adopt steel ball is mainly for breaking copper powder, zinc powder, glass putty mixed process because the large-scale particle of bonding formation.The effect of steel ball is conducive to improve the effect of 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 15% when following, can't reach abundant broken powder granule and roll into a ball effect, powder homogenising degree is affected, when steel ball content accounts for gross mass 20% when above, the effect promoting that the broken powder granule that steel ball plays is rolled into a ball is not obvious, from the angle of entreprise cost and production operation convenience degree, considers, while through test of many times research, finding that the addition of steel ball is 20%, crushing effect is the most obvious, is convenient to the carrying out that produces most.
Determining of incorporation time of the present invention: in incorporation time, during greater than 60 minutes, be unfavorable for the carrying out that produces, during less than 60 minutes, mixed effect is not obvious in incorporation time.
In diffusion-sintering process of the present invention; when diffusion temperature during lower than the fusing point (231.9 ℃) of tin; the formation of partially-alloyed powder is mainly diffusion-solid solution mechanism; wherein Zn is because of its highly volatile; High temperature diffusion under protective atmosphere, extremely with powder in, the oxygen of copper particle surface reacts; remove impurity, promote the carrying out of diffusion.When alloy phase at solution of tin to the copper particle, after zinc particle infiltration reaches capacity, with the form of solid phase alloy, at copper powder and zinc particle surface in situ, separate out, and be closely linked with the copper powder zinc powder, rely on diffusion-solid solution mechanism.Under the effect of temperature at driving force, Cu, Sn, tri-kinds of powder particles of Zn are to the counterdiffusion of granule interior phase, forming section alloying powder.During higher than zinc fusing point (419.5 ℃), two kinds of mechanism exist simultaneously when diffusion temperature, but mainly melting-to dissolve-mechanism of separating out carries out, and what this moment, Sn can be preferential produces alloy phase, phase counterdiffusion between the homophase element with Zn.Simultaneously, copper, to tin zinc solution diffusion dissolution, forms the ternary alloy three-partalloy phase.When alloy phase reaches capacity in the tin zinc solution after, then rely on diffusion-solid solution mechanism, tin zinc element continues to the copper powder particle diffusion inside, to improve alloying level.Through test, the diffusion 660 tin bronze powder that the prealloy diffusion technique is produced are 30 minutes diffusion-sintering time under 450 degree, can reach the disperse state of product requirement, and be beneficial to the carrying out of production most.
For prealloy diffusion 660 tin bronze powder craft performances, need to carry out the checking of product, 3 groups of rings of 660 tin bronze powder making of different process production, 6 groups of cylinders are tested to mechanical property, specifically see the following form
More than the crushing strength that the 660 tin bronze powder that adopt the prealloy diffusion method to produce are made product reaches 27MPa, far away higher than industry standard 18MPa; 660 tin bronze powder are made the stable contraction rate of product in 6 ‰.The shrinkage factor rate of change is more stable, and the product changing value is less; 660 tin bronze powder are made the oil content 25% of product far above industry standard.
Box atmosphere furnace service condition: what in production, adopt is QFL series atmosphere furnace, main reducing atmosphere, the ammonia dissolving atmosphere that adopts.Rated temperature is respectively 1300 ℃, size of burner hearth D * W * H(400 * 300 * 300mm).In the diffusion 660 tin bronze powder sintering processes that the prealloy diffusion technique is produced, the powder that mixes is laid in burner hearth, THICKNESS CONTROL, at 5～7cm, is conducive to the carrying out of spreading.
By comparing the performance of mixed powder, atomized powder and three kinds of powder of diffusion pre-alloyed 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 arts that the inventive method is produced have the irregular feature of atomized powder, with atomized powder, compare, and have the characteristics such as low pine ratio, high fluidity, with mixed powder, compare, and have high fluidity.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, controls the pressed compact sintered dimensions and changes, and in the precise miniature bearing production process, is of great practical significance.During copper tin mixing briquet sintering, its size may be grown up, and can shrink phenomenon during prealloy powder briquet sintering.The prealloy diffusion technique has overcome the limitation of mixed powder and complete alloyed powder, by coalescent the combining of segregation-free of the easy formability of mixing method and complete alloyed powder, thereby use compacting-sintering process can produce high strength, high tenacity, stablize the powder metallurgical component of mechanical property, is an important breakthrough of Powder Metallurgy Industry.For the 660 tin bronze mealiness energy that checking the inventive method is produced, we will adopt 660 tin bronze powder of three kinds of explained hereafter to compare.The 660 tin bronze mealiness that are three kinds of different process are produced as shown in the table can be suppressed product relatively.
In sum, after having adopted this method, in production process, be easy to moulding, sintered dimensions easy to control, without lamination, the crushing strength after the 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; can also on the basis of above-described embodiment, carry out various permutation and combination and conversion; under the prerequisite without prejudice to spirit of the present invention, the various conversion that the present invention is carried out all drop in protection scope of the present invention.
Claims (2)
1. produce the prealloy diffusion method of tin bronze powder, it is characterized in that it comprises the steps: that-300 order glass puttys of 86%～90%-200 order water atomization pure copper powder, 5%～7%-300 order zinc powders and 5%～7% are put into to the V-type mixing machine to be mixed, in mixed process, interpolation lithium stearate and 15%～25% steel ball close and criticized 50～70 minutes, after mixing, adopt box atmosphere furnace diffusion-sintering, 450 ℃ of sintering temperatures, 30 minutes diffusion-sintering time.
2. the prealloy diffusion method of production tin bronze powder according to claim 1, it is characterized in that-300 order glass puttys of 88%-200 order water atomization pure copper powder, 6%-300 order zinc powders and 6% are put into to the V-type mixing machine to be mixed, the steel ball that adds 1% lithium stearate and 20% in mixed process closes batches 60 minutes.
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Cited By (7)
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| 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 |
| CN105057681A (en) * | 2015-07-29 | 2015-11-18 | 昆山德泰新材料科技有限公司 | Preparation method for tungsten copper nickel alloy powder |
| CN105382253A (en) * | 2015-12-10 | 2016-03-09 | 湖南省天心博力科技有限公司 | Method for producing premixed copper-tin 10 bronze |
| 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 |
| CN110102771A (en) * | 2019-03-25 | 2019-08-09 | 安徽鑫佳铜业有限公司 | A kind of preparation method of high green compact high stability environmental protection 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 |
| CN113878123A (en) * | 2021-04-15 | 2022-01-04 | 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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057681A (en) * | 2015-07-29 | 2015-11-18 | 昆山德泰新材料科技有限公司 | Preparation method for 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 |
| CN105382253A (en) * | 2015-12-10 | 2016-03-09 | 湖南省天心博力科技有限公司 | Method for producing premixed copper-tin 10 bronze |
| 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 |
| CN110102771A (en) * | 2019-03-25 | 2019-08-09 | 安徽鑫佳铜业有限公司 | A kind of preparation method of high green compact high stability environmental protection diffusion type tin zinc-copper powder |
| 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 |
| CN113878123A (en) * | 2021-04-15 | 2022-01-04 | 芜湖松合新材料科技有限公司 | Preparation method of high-quality copper-tin powder |
| 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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