CN101709406B - Manganese dioxide unleaded cutting brass and preparation method thereof - Google Patents
Manganese dioxide unleaded cutting brass and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a manganese dioxide unleaded cutting brass and a preparation method thereof, wherein the mass fraction of the elements in the brass of the invention is: copper 48.0% to 70.0%, aluminum 0.2% to 0.4%, stibium 2.2% to 4.0%, manganese 0.4% to 2.7%, cerium 0.02% to 0.2%, lanthanum 0.001% to 0.1%. The rest is zinc and impurity less than 0.05%. The powders and the bonder are mixed with mass fraction as follows: manganese dioxide powder 0.4% to 2.4%, sintering activator stibium powder 2% to 4%, bonder zinc stearate 1% and the rest being copper powder. Powders are mixed with a planetary ball mill frame and the weight ratio of pellet is 10:1. Mix materials for 6 hours and then press the mixed powder. The sintering process is to heat from room temperature to a sintering temperature for 5 hours in order to fully remove the bonder. The sintering temperature is 830 to 850 DEG C and the sintering time is 4 to 6 hours. The sintering atmosphere is hydrogen. Cool to room temperature by adding water after finishing sintering. The alloy of the invention contains no lead, is environment-friendly, has simple production process and is applied to large-scale quantity production.
Description
Technical field the present invention is a kind of metallic substance and preparation method thereof.
The background technology leaded brass has characteristics such as good cold and hot working performance, fabulous cutting ability and self-lubricating, can satisfy the machining of different shape component, so Winn bronze is once by universally acknowledged foundry goods and the fields such as accessory, electronics, automobile and machinofacture thereof that are widely applied to the domestic water supply system for important base mateiral.Plumbous solubleness in the brass melt is very big, and the solid solubility in copper is almost nil, so when the leaded brass melt solidifying, plumbous meeting precipitates and forms disperse and fine plumbous particle.Lead has more crisp and not hard characteristics, on the other hand, plumbous fusing point has only 327.5 ℃, the intensification that produces when leaded brass is carried out machining can make plumbous particle softer, when leaded brass was cut, the refined lead particle of these disperses was equivalent to a cavity in brass, becomes stress raiser, produce so-called " notched effect ", thereby cause smear metal to be easy in this fracture.In addition, cutter head and smear metal contact the part because of the machining instant melting that is heated, help to change the shape of smear metal, and play the effect of lubricated cutter, can make tool bit abrasion reduce to minimum.Therefore, plumbous cracked smear metal, minimizing bonding and seam and the raising cutting speed of playing a part in the cutting process of free-cutting brass material can improve the efficient of machining greatly, and increase the work-ing life of cutter.Plumbous have conclusive effect at the existence that easily cuts in the leaded brass to its cutting ability, but on the other hand, its existence is unfavorable to the use properties of leaded brass.After the leaded brass spare and accessory parts were scrapped, a lot of smallclothes were used as rubbish and abandon, and have only to be recovered utilization on a small quantity.The depleted leaded brass contacts with soil, and its contained lead enters soil under rainwater and atmospheric long term, thus contaminated soil and water source.When discarded leaded brass was taken as waste incineration, plumbous steam distributed among atmosphere, human body is produced greatly harm, thereby it used the restriction that is subjected to strictness day by day.The i.e. not solid solution of lead does not form intermetallic compound with copper yet, but is present in crystal boundary with the particle form of simple substance in copper.Lead under the effect of impurity in tap water and organic acid etc. in the copper alloy containing lead is slowly separated out with the ionic form, and existing copper alloy containing lead is difficult to satisfy the requirement of environmental protection act.In order to reduce plumbous deleterious effect, the scientific research personnel with regard to tap water to the mechanism of corrosion of brass and add element the corrosive effects of brass has been carried out systematic research, and taked multiple measure, as add the corrosion resisting property that alloying elements such as tin, nickel improve leaded brass, or the lead of solubility removed metals such as covering chromium then on the surface of deleading again or take other method to suppress plumbous leaching etc.Owing to exist lead all the time in the brass, these methods can't fundamentally be eliminated plumbous deleterious effect.
No matter, still, valueless to the improvement that leaded brass is patched up again from the angle of Technological Economy from environmental protection laws and regulations both domestic and external, have exploitation plumbous novel brass of generation only.People have the process of a long-term accumulation to the research of metal, alloy, compound, and are quite abundant to the understanding of its characteristic.Elements such as bismuth, antimony, magnesium, phosphorus, sulphur join that the improvement to cutting ability has obtained common recognition in the brass, and a large amount of patent disclosures is all arranged both at home and abroad, as: leadless free-cutting brass alloy material and its manufacture method, 02121991.5; Leadless free-cutting brass alloy, 200310109162.0; Ecological, environmental protective new type leadless easy cutting low antimony bismuth brass alloys and manufacture method thereof, 200510050425.4; Pb-free copper-alloy, 200610005689.2; A kind of unleaded easy-cutting magnesium-bismuth-brass alloys, 200710098481.4; A kind of leadless free-cutting magnesium silicon brass 2009-2-25200910042723.7; A kind of casting non-leaded easily-cutting brass 200910044315.5.It must be noted that compare with easy cutting leaded brass, the cutting ability of all at present non-leaded easily-cutting brass is all undesirable, also existing processing characteristics and use properties simultaneously has the phenomenon that descends in various degree.Especially in the processing of the small-sized spare and accessory parts of brass, abnormal member, far can not satisfy scientific research, production practice to performance demands such as its casting, machining.Currently press for the process requirements that a kind of novel brass material satisfies brass small articles, abnormal member.The present invention considers this demand just and develops.
Summary of the invention
The objective of the invention is to effectively solve the leaded brass problem of environment pollution caused, for the small-scale structure spare in fields such as electron device, hot-water heating bathroom, clock and watch provides a kind of non-leaded easily-cutting brass and preparation method thereof cheaply.
Particular content of the present invention:
The massfraction of each element is respectively in the brass powder of the present invention: copper 54.0%-70.0%, and aluminium 0.3%-0.4%, manganese 0.1%-0.3%, cerium 0.03%-0.09%, lanthanum 0.01%-0.03%, all the other are zinc.Sintering activator is to contain the antimony powder that mixes rare earth 2%-5%, and mishmetal is respectively cerium 75% by massfraction and lanthanum 25% is formed.Brass powder and sintering activator antimony powder granularity≤74 μ m; The granularity of manganese dioxide powder≤10 μ m.Various powder and binding agent massfraction are respectively: manganese dioxide powder 0.4%-2.4%, and sintering activator antimony powder 2.2%-4%, binding agent Zinic stearas 1%, surplus is a brass powder.
Technical process of the present invention is as follows:
Non-leaded easily-cutting brass of the present invention adopts powder activated sintering method to produce.Various powder and binding agent prepare by following massfraction ratio: manganese dioxide powder 0.4%-2.4%, and sintering activator antimony powder 2.2%-4%, binding agent Zinic stearas 1%, surplus is a brass powder.The planetary type ball-milling frame mixes powder, pellet mass ratio 10: 1, mixing time 6 hours, compacting immediately behind the mixed powder.Sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent.Sintering temperature 830-850 ℃, sintering time 4-6 hour.Sintering atmosphere is a nitrogen atmosphere.The intact back water flowing of sintering cool to room temperature.
Principle of the present invention is as follows:
Aluminium significantly dwindles alpha phase zone, when aluminium content is high, the γ phase can occur, improves the intensity and the hardness of alloy, but reduces plasticity significantly.In aluminum brass, the surface ion tendency of aluminium is bigger than district's zinc, preferentially forms fine and close and firm pellumina can prevent the further oxidation of alloy.Aluminium improves its castability by improving its flowability in brass, but aluminium is unfavorable to the dezincify ability that improves brass.The low price of aluminium can reduce the cost of brass, improves its market competitiveness.Aluminium content of the present invention is controlled at 0.2%-0.4%, can reach intensity, hardness and the plasticity that makes brass, anti-dezincify ability so that the balance between the cost.
The solubleness of antimony in copper sharply reduces along with decrease of temperature, is less than at 0.1% o'clock at its content, will the crisp Cu of formation property
2Sb is net distribution in crystal boundary, and the cold-forming property of brass is descended significantly.At high temperature the solubleness in copper is bigger owing to antimony, thereby solution treatment can improve the cold-forming property that contains merimee's yellow copper.On the other hand, add a spot of rare earth element, can make and improve Cu
2The reticulated structure of Sb reduces its disadvantageous effect to the brass cold-forming property.Brittle Cu
2The Sb particle is favourable to chip breaking, thereby antimony is highly beneficial to the machining ability that improves brass.Antimony also makes copper alloy produce red brittleness, and too high antimony worsens the hot workability of brass, is unfavorable for hot-work, causes the cost of goods to improve.In the present invention, antimony powder is used as the activated sintering agent, distributional pattern in sinterred brass has following feature: produce liquid phase in sintering process, open in that the effect lower edge of capillary force Manganse Dioxide particle and crystal boundary are auxilliary, because of Manganse Dioxide partitioned portion antimony forms alternate antimony particle, the solid solution of part antimony enters intracrystalline, and other has part antimony then to form intermetallic compound particle with alloying element such as copper.Antimony content of the present invention is controlled at 2.2%-4.0%, has obviously optimized the machinability of brass, the cost market competitiveness as rich as Croesus.
Though manganese is an element that dwindles alpha phase zone, its effect is not obvious, and is also little to the influence of brass tissue.Manganese has the solution strengthening effect to brass, and can strengthen the corrosion resistance of brass to seawater, muriate and superheated vapour greatly.Manganese brass has goodish processing characteristics.Add manganese and mainly be in order to improve corrosion resistance of alloy, and utilize the solution strengthening effect of manganese brass.In casting technique, manganese content is unsuitable too high, preferably be controlled at below 0.4%, otherwise more high-load manganese causes alloy rigidity to increase, and can generate the big blocky Mn of high rigidity with pasc reaction
5Si
3Compound is unfavorable for the machining of alloy.Among the present invention, brass is prepared to powder, also can avoid occurring big blocky Mn even add more manganese
5Si
3Compound can not worsen the machinability of alloy.Manganese mainly is to exist with the Manganse Dioxide particle form among the present invention, for main contribution is made in the raising of cutting ability.
But rare earth metal is modifying-refining γ phase also, it is evenly distributed and improves cutting ability, reduces the detrimentally affect of the relative plasticity of γ; It also has the effect that purifies crystal boundary in addition, reduces the harmful effect that is positioned at impurity on the crystal boundary.But rare earth is oxidation very easily, even add the flowability that trace also obviously reduces alloy.Rare earth element is a very big series, and the action effect of different rare earth elements in brass, cost etc. are obviously different, how to choose suitable rare earth element, how to choose optimum content, and extensive work is very huge.The present invention has optimized the content cerium 0.02%-0.2% of rare earth, and lanthanum 0.001%-0.1% has reached the best of breed of content, effect and cost.
Manganse Dioxide is a kind of intermediate oxide.It is black or a brown ceramic powder shape solid highly stable under a kind of normal temperature, is the main component of pyrolusite.The skeleton structure of Manganse Dioxide is octahedra, and Sauerstoffatom is on top, octahedra angle, and manganese atom is in octahedron, octahedra rib altogether is connected to form strand or two strands, and these chains and other chain push up interstitial tunnel structure altogether, octahedron or one-tenth hexagonal closs packing, or become cubic close packing.This particular structure of Manganse Dioxide makes it also have more crisp, softer characteristics.The Manganse Dioxide disperse that particle is tiny is distributed in the brass, when brass is carried out machining, can play the effect of chip breaking.Simultaneously, the Manganse Dioxide that particle is tiny can also play lubrication to cutting tool, improves stock-removing efficiency.The Manganse Dioxide sinterred brass is a kind of outstanding non-leaded easily-cutting brass, and great application prospect is arranged.
Powder metallurgy is suitable for producing same shape and the many products of quantity, particularly to the product of smallclothes, abnormal member.Tend to stay certain hole in the sintered metal product, and its porosity can be controlled under proper technical conditions.Easily keeping certain porosity to the mechanical property influence not quite in the machining brass, but its processing characteristics is produced favorable influence, the porosity of optimizing in the powder metallurgy free-cutting brass has important and practical meanings.When brass was carried out machining, smear metal will disconnect at the hole place.So the existence of hole is very favorable to improving cutting ability.If but hole is too much, the mechanical property of brass is reduced significantly, and also not obvious to the raising effect of cutting ability.Activated sintering is meant adopts measure some physics or chemistry in sintering process, sintering temperature is reduced greatly, and sintering time significantly shortens, and the performance of sintered compact improves and improves.Produce non-leaded easily-cutting brass spare with the activated sintering method, will produce good economic benefit and social benefit.
The machinability that the present invention improves brass mainly contains following three kinds of mechanism: the one, and the Manganse Dioxide that particle is tiny and more crisp, softer has the chip breaking effect in alloy.When brass is carried out machining, under the effect of cutting tool, smear metal just is equivalent to run into a hole at the Manganse Dioxide place, can disconnect herein.The 2nd, the crisp and soft microparticle that antimony forms in the activated sintering process and and the friable metal that generates of reaction such as copper between compound particle all obviously improve the cutting ability of brass; The 3rd, hole an amount of in the sintered metal product is very favourable to machining, and micropore can play the chip breaking effect in the cutting process of brass ware.We can say that micropore is all more far better than other all particulate chip breaking effects, the resistance that smear metal is subjected to herein is almost nil.Under the comprehensive action of these three kinds of chip breaking mechanism, cutting ability is greatly enhanced just in the present invention.
Materials respectively Brinell hardness, cutting ability and the porosity of beta alloy.
Cutting technology parameter to brass is: 4 ° of tool orthogonal rakes; Cutting speed 1.5mm/min; Amount of feed 1.5mm/min; Speed of mainshaft 600r/min.During machining all smear metals are collected, then smear metal is crossed 30 mesh sieves, take by weighing the quality of all smear metals and sieve the quality of fines down, calculate fines per-cent.With the density of Archimedes's drainage mensuration brass,, calculate the porosity of brass then according to theoretical density and actual density.
Advantage of the present invention:
1) realized the unleaded of free-cutting brass, not leaded, environmentally friendly in the alloying constituent.
2) utilized the antimony element of effective raising brass cutting ability, under the multiple comprehensive action of Manganse Dioxide, antimony and hole, alloy has excellent machinability.
3) production technique is simple, reliable, is suitable for large-scale mass production, and especially at smallclothes, abnormal member, production cost is very low.
Embodiment
Embodiment 1:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 54.0%, aluminium (Al) 0.4%, manganese (Mn) 0.1%, cerium (Ce) 0.09%, lanthanum (La) 0.03%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 0.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the planetary type ball-milling frame to mix powder, put into the ball milling pearl by 10% of powder total mass before the pellet mass ratio 10: 1, ball milling, the ball milling time is 6 hours, compacting immediately behind the mixed powder.Sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent.830 ℃ of sintering temperatures, sintering time 5 hours.Sintering atmosphere is a nitrogen atmosphere.Be cooled fast to room temperature after sintering is intact.By Brinell hardness experiment, density measurement experiment, cutting experiment contrast, found that the Brinell hardness of this sintered leadless free-cutting brass is HB95.3, fines per-cent is 21.5%, and porosity is 5.6%, and cutting ability is equivalent to 67% of HPb59-1.
Embodiment 2:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 54.0%, aluminium (Al) 0.2%, manganese (Mn) 0.2%, cerium (Ce) 0.09%, lanthanum (La) 0.03%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.0% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the planetary type ball-milling frame to mix powder, put into the ball milling pearl by 10% of powder total mass before the pellet mass ratio 10: 1, ball milling, the ball milling time is 6 hours, compacting immediately behind the mixed powder.Sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent.840 ℃ of sintering temperatures, sintering time 6 hours.Sintering atmosphere is a nitrogen atmosphere.Be cooled fast to room temperature after sintering is intact.By Brinell hardness experiment, density measurement experiment, cutting experiment contrast, found that the Brinell hardness of this sintered leadless free-cutting brass is HB96.9, fines per-cent is 22.6%, and porosity is 5.4%, and cutting ability is equivalent to 71% of HPb59-1.
Embodiment 3:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 54.0%, aluminium (Al) 0.4%, manganese (Mn) 0.1%, cerium (Ce) 0.06%, lanthanum (La) 0.02%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.6% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the planetary type ball-milling frame to mix powder, put into the ball milling pearl by 10% of powder total mass before the pellet mass ratio 10: 1, ball milling, the ball milling time is 6 hours, compacting immediately behind the mixed powder.Sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent.830 ℃ of sintering temperatures, sintering time 6 hours.Sintering atmosphere is a nitrogen atmosphere.Be cooled fast to room temperature after sintering is intact.By Brinell hardness experiment, density measurement experiment, cutting experiment contrast, found that the Brinell hardness of this sintered leadless free-cutting brass is HB95.9, fines per-cent is 21.8%, and porosity is 5.5%, and cutting ability is equivalent to 68% of HPb59-1.
Embodiment 4:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 54.0%, aluminium (Al) 0.4%, manganese (Mn) 0.1%, cerium (Ce) 0.03%, lanthanum (La) 0.01%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 2.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 2.2%, and surplus is the brass powder.Adopt the planetary type ball-milling frame to mix powder, put into the ball milling pearl by 10% of powder total mass before the pellet mass ratio 10: 1, ball milling, the ball milling time is 6 hours, compacting immediately behind the mixed powder.Sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent.830 ℃ of sintering temperatures, sintering time 4 hours.Sintering atmosphere is a nitrogen atmosphere.Be cooled fast to room temperature after sintering is intact.By Brinell hardness experiment, density measurement experiment, cutting experiment contrast, found that the Brinell hardness of this sintered leadless free-cutting brass is HB95.5, fines per-cent is 20.9%, and porosity is 5.6%, and cutting ability is equivalent to 66% of HPb59-1.
Embodiment 5:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 59%, aluminium (Al) 0.4%, manganese (Mn) 0.3%, cerium (Ce) 0.06%, lanthanum (La) 0.02%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 0.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 4%, and surplus is the brass powder.Adopt the planetary type ball-milling frame to mix powder, put into the ball milling pearl by 10% of powder total mass before the pellet mass ratio 10: 1, ball milling, the ball milling time is 6 hours, compacting immediately behind the mixed powder.Sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent.840 ℃ of sintering temperatures, sintering time 4 hours.Sintering atmosphere is a nitrogen atmosphere.Be cooled fast to room temperature after sintering is intact.By Brinell hardness experiment, density measurement experiment, cutting experiment contrast, found that the Brinell hardness of this sintered leadless free-cutting brass is HB96.2, fines per-cent is 20.8%, and porosity is 5.8%, and cutting ability is equivalent to 70% of HPb59-1.
Embodiment 6:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 59%, aluminium (Al) 0.3%, manganese (Mn) 0.2%, cerium (Ce) 0.09%, lanthanum (La) 0.03%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.0% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 4%, and surplus is the brass powder.Adopt the planetary type ball-milling frame to mix powder, put into the ball milling pearl by 10% of powder total mass before the pellet mass ratio 10: 1, ball milling, the ball milling time is 6 hours, compacting immediately behind the mixed powder.Sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent.840 ℃ of sintering temperatures, sintering time 5 hours.Sintering atmosphere is a nitrogen atmosphere.Be cooled fast to room temperature after sintering is intact.By Brinell hardness experiment, density measurement experiment, cutting experiment contrast, found that the Brinell hardness of this sintered leadless free-cutting brass is HB96.9, fines per-cent is 22.5%, and porosity is 5.8%, and cutting ability is equivalent to 72% of HPb59-1.
Embodiment 7:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 59%, aluminium (Al) 0.4%, manganese (Mn) 0.1%, cerium (Ce) 0.09%, lanthanum (La) 0.03%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.6% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 4%, and surplus is the brass powder.Adopt the technology of embodiment 5, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB95.1, and fines per-cent is 21.2%, porosity is 5.4%, and cutting ability is equivalent to 71% of HPb59-1.
Embodiment 8:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 59%, aluminium (Al) 0.4%, manganese (Mn) 0.3%, cerium (Ce) 0.03%, lanthanum (La) 0.01%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 2.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the technology of embodiment 2, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB95.0, and fines per-cent is 21.0%, porosity is 5.5%, and cutting ability is equivalent to 69% of HPb59-1.
Embodiment 9:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 65%, aluminium (Al) 0.4%, manganese (Mn) 0.2%, cerium (Ce) 0.06%, lanthanum (La) 0.02%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 0.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the technology of embodiment 1, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB94.8, and fines per-cent is 21.1%, porosity is 5.5%, and cutting ability is equivalent to 68% of HPb59-1.
Embodiment 10:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 65%, aluminium (Al) 0.4%, manganese (Mn) 0.2%, cerium (Ce) 0.09%, lanthanum (La) 0.03%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.0% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 4%, and surplus is the brass powder.Adopt the technology of embodiment 3, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB95.9, and fines per-cent is 21.4%, porosity is 5.7%, and cutting ability is equivalent to 70% of HPb59-1.
Embodiment 11:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 65%, aluminium (Al) 0.4%, manganese (Mn) 0.1%, cerium (Ce) 0.06%, lanthanum (La) 0.02%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.6% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the technology of embodiment 2, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB96.0, and fines per-cent is 20.9%, porosity is 5.5%, and cutting ability is equivalent to 69% of HPb59-1.
Embodiment 12:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 65%, aluminium (Al) 0.4%, manganese (Mn) 0.1%, cerium (Ce) 0.03%, lanthanum (La) 0.01%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 2.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the technology of embodiment 1, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB95.4, and fines per-cent is 21.4%, porosity is 5.6%, and cutting ability is equivalent to 67% of HPb59-1.
Embodiment 13:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 70%, aluminium (Al) 0.4%, manganese (Mn) 0.3%, cerium (Ce) 0.03%, lanthanum (La) 0.01%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 0.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 2.2%, and surplus is the brass powder.Adopt the technology of embodiment 1, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB95.1, and fines per-cent is 21.1%, porosity is 5.5%, and cutting ability is equivalent to 66% of HPb59-1.
Embodiment 14:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 70%, aluminium (Al) 0.4%, manganese (Mn) 0.2%, cerium (Ce) 0.06%, lanthanum (La) 0.01%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.0% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the technology of embodiment 3, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB95.6, and fines per-cent is 21.6%, porosity is 5.7%, and cutting ability is equivalent to 68% of HPb59-1.
Embodiment 15:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 70%, aluminium (Al) 0.4%, manganese (Mn) 0.3%, cerium (Ce) 0.03%, lanthanum (La) 0.01%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 1.6% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 3%, and surplus is the brass powder.Adopt the technology of embodiment 3, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB95.5, and fines per-cent is 21.4%, porosity is 5.6%, and cutting ability is equivalent to 67% of HPb59-1.
Embodiment 16:
The composition of sintered leadless free-cutting brass powder (being massfraction), copper (Cu) 70%, aluminium (Al) 0.4%, manganese (Mn) 0.1%, cerium (Ce) 0.03%, lanthanum (La) 0.01%, all the other are zinc (Zn).The massfraction of manganese dioxide powder is 2.4% when joining powder, and the massfraction of binding agent Zinic stearas is 1%, sintering activator antimony powder 2.2%, and surplus is the brass powder.Adopt the technology of embodiment 1, by Brinell hardness experiment, density measurement experiment, cutting experiment contrast, the Brinell hardness of this sintered leadless free-cutting brass is HB94.8, and fines per-cent is 20.7%, porosity is 5.3%, and cutting ability is equivalent to 65% of HPb59-1.
Claims (1)
1. the preparation method of a manganese dioxide unleaded cutting brass, it is characterized in that: various powder and binding agent prepare by following massfraction ratio: manganese dioxide powder 0.4%-2.4%, sintering activator antimony powder 2.2%-4%, binding agent Zinic stearas 1%, surplus is a brass powder, the massfraction of each element is respectively in the brass powder: copper 54.0%-70.0%, aluminium 0.3%-0.4%, manganese 0.1%-0.3%, cerium 0.03%-0.09%, lanthanum 0.01%-0.03%, all the other are zinc, the planetary type ball-milling frame mixes powder, pellet mass ratio 10: 1, mixing time 6 hours, suppress immediately after mixing powder, sintering process is: begin to be heated to sintering temperature from room temperature, 5 hours heat-up times are so that fully remove binding agent, sintering temperature 830-850 ℃, sintering time 4-6 hour, sintering atmosphere was a nitrogen atmosphere, the intact back water flowing of sintering cool to room temperature.
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| CN106167861A (en) * | 2016-08-09 | 2016-11-30 | 洛阳名力科技开发有限公司 | A kind of copper alloy for electronic material |
| CN115305382A (en) * | 2021-05-13 | 2022-11-08 | 湖南特力新材料有限公司 | Lead-free-cutting brass and preparation method thereof |
| CN115305381A (en) * | 2021-05-13 | 2022-11-08 | 湖南特力新材料有限公司 | Lead-free-cutting brass alloy and manufacturing process thereof |
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| JP2004263298A (en) * | 2003-02-28 | 2004-09-24 | Wieland Werke Ag | Lead-free copper alloy and method for using the same |
| CN101157998A (en) * | 2007-11-13 | 2008-04-09 | 浙江海亮股份有限公司 | Tin-brass alloy containing rare earth |
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| JP2004263298A (en) * | 2003-02-28 | 2004-09-24 | Wieland Werke Ag | Lead-free copper alloy and method for using the same |
| CN101157998A (en) * | 2007-11-13 | 2008-04-09 | 浙江海亮股份有限公司 | Tin-brass alloy containing rare earth |
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