CN106435256B - A kind of easy-cutting lead-free graphite brass and preparation method thereof - Google Patents
A kind of easy-cutting lead-free graphite brass and preparation method thereof Download PDFInfo
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- CN106435256B CN106435256B CN201610898581.4A CN201610898581A CN106435256B CN 106435256 B CN106435256 B CN 106435256B CN 201610898581 A CN201610898581 A CN 201610898581A CN 106435256 B CN106435256 B CN 106435256B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F2003/145—Both compacting and sintering simultaneously by warm compacting, below debindering temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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Abstract
The invention discloses a kind of easy-cutting lead-free graphite brass, including：Copper 53.25 59.85%, zinc 38 41%, graphite 0.5 3%, chromium 0.55 0.75%, iron 0.1 0.3%, tin 0.50 1.00%, titanium 0.5 0.7%.Its preparation method is：Cu powder, Fe powder, Sn powder, Ti powder, Cr powder and Zn powder are melted under 1600 1700K, and are incubated 50 70min of solid solution, obtains super saturated solid solution brass alloys；Then alloy powder is prepared into, then is mixed with graphite powder, the 40min of hot pressed sintering 20 under the conditions of 1000 1100K, furnace cooling to 350 below 400K；Last forged successively, hot pressing, drawing, obtain unleaded graphite brass.The unleaded graphite brass of the present invention is entirely free of lead, safe and non-toxic, and with very high at present tensile strength and cutting ability.
Description
Technical field
The invention belongs to brass preparing technical field, and in particular to a kind of easy-cutting lead-free graphite brass, further relate to this
The preparation method of unleaded graphite brass.
Background technology
Ledrite is a kind of complex brass being most widely used, and it has excellent cutting ability, anti-wear performance and high-strength
Degree, it is mainly used in various connectors in mechanical engineering, valve, stem bearing holding.In Cutting free ledrite, tiny lead
Grain is in Dispersed precipitate, plays lubrication and chip breaking function, so as to improve production efficiency, reduces the effect of processing cost.However, work as lead
When brass is used as the drinking water pipeline accessories such as tap, pipe joint, lead can be leached and entered in water, seriously endanger health；
Lead in parts easily enters people's soil, and air can also be entered so as to seriously pollute environment by being such as incinerated, thus its application should be by
To strict limitation.Harm of the lead to the mankind is mainly shown as：Damaged brain maincenter and peripheral nervous system；Destroy hemopoietic system,
The synthesis of ferroheme is hindered, causes anaemia；Influence function of digestive system etc..The U.S. and European Union《ROHS is instructed》New standard and method
Order regulation：By 2006, the lead dissolution standard of water channel must be reduced to 0.01mg/L from present 0.05mg/L.China at present
Water channel lead release is significantly larger than 0.05mg/L, generally 0.1mg/L.From the aspect of environmental protection and personal safety, use
Brass should be low lead or unleaded environment-protective free-cutting copper alloy.
2005, the patent of invention of Japanese Mikoshi Metal Co., Ltd.'s application《Brass》(China Patent No.
200580001492.5 publication number：1906317, publication date：2007.01.31), there is provided forging and decay resistance are preferable
Lead-free reflow, it is characterized in 0.5-2.5wt.% containing Bi.However, this flavonod, during on probation, easily cracking causes product
Larger accident, use has been stopped at present.2008, the patent of invention of ningbo of china Bo Wei groups application《It is a kind of resistance to de-
The low-stibium aluminum yellow brass alloy and its manufacture method of zine corrosion》(patent No. 200810163233.8, publication number：101440443 disclosures
Day：2009.05.27 in), there is provided the low-stibium aluminum yellow brass alloy and its manufacture method of a kind of Dezincification corrosion resistant, it is micro- by adding
Antimony and aluminium are measured, with reference to the technique of alloy refining-continuous casting-extruding-stretching-heat treatment-pickling-stress relief annealing-finished product
Flow, technological process length, Dezincification corrosion resistant performance is bad, and production cost is high.
In current existing material and technology of preparing, existing subject matter is：Still micro lead is added in brass, separately
The bismuth of outer addition is also easy to produce Dezincification corrosion and cracking and triggers security incident during brass use；And Dezincification corrosion resistant
Still micro lead and antimony are contained in low-stibium aluminum yellow brass alloy, Dezincification corrosion resistant performance is also undesirable.Therefore, it is necessary to develop one kind
Environmental protection, high-strength brass alloy simultaneously study its preparation method.
The content of the invention
It is an object of the invention to provide a kind of easy-cutting lead-free graphite brass, solve that existing Winn bronze is poisonous and tension
The problem of intensity and cutting ability can not be taken into account.
It is a further object of the present invention to provide the preparation method of above-mentioned easy-cutting lead-free graphite brass.
The technical solution adopted in the present invention is a kind of easy-cutting lead-free graphite brass, including following mass percent
Element：Copper 53.25-59.85wt.%, zinc 38-41wt.%, graphite 0.5-3wt.%, chromium 0.55-0.75wt.%, iron 0.1-
0.3wt.%, tin 0.50-1.00wt.%, titanium 0.5-0.7%, above element mass percent summation are 100%.
Another technical scheme of the present invention is the preparation method of above-mentioned easy-cutting lead-free graphite brass, including
Following steps：
Step 1, solution treatment
Material powder is weighed respectively, wherein, Cu powder 53.25-59.85wt.%, Zn powder 38-41wt.%, graphite powder 0.5-
3wt.%, Cr powder 0.55-0.75wt.%, Sn powder 0.50-1.00wt.%, Ti powder 0.5-0.7% and Fe powder 0.1-
0.3wt.%.Cu powder, Fe powder, Sn powder, Ti powder, Cr powder and Zn powder are melted under 1600-1700K, and are incubated solid solution 50-
70min, obtain CuZnCrFeSnTi super saturated solid solution brass alloys.
Step 2, powder processed
CuZnCrFeSnTi super saturated solid solution alloys are prepared into super saturated solid solution Braze alloy powder, by super saturated solid solution
Braze alloy powder mixes with graphite powder, and finely dispersed mixed-powder is made.
Step 3, hot pressed sintering
Mixed-powder is first pressed into bar stock, places into and sinters 20-40min in Muffle furnace under the conditions of 1000-1100K, so
Furnace cooling is to below 350-400K afterwards.
Step 4, forged, hot pressing, drawing successively, obtains the unleaded graphite brass.
The characteristics of this method, also resides in：
Preferably, in step 2 particle diameter of super saturated solid solution Braze alloy powder at 150-250 μm.
Preferably, super saturated solid solution Braze alloy powder uses water atomization in step 2, and its pressure is 8-10MPa, temperature
For 1273K-1673K DEG C, jet size 10mm.
Preferably, the particle diameter of mixed-powder is not more than 10 μm in step 2.
Preferably, super saturated solid solution Braze alloy powder prepares mixed powder with graphite powder using vibratory milling method in step 2
End, ball milling 1-3 hours, rotating speed 300-450rpm, ratio of grinding media to material 1-3：1.
Preferably, forged in step 4 specifically, in 950-1150K heats forgeds, 773-873K homogenizing annealings.
Preferably, in step 1 particle diameter of material powder at 30-50 μm.
The invention has the advantages that the unleaded graphite brass of the present invention is entirely free of lead, it is safe and non-toxic, and with current
Very high tensile strength and cutting ability, solves that traditional brass is leaded, and asking of can not taking into account of tensile strength and cutting ability
Topic.The intensity of graphite brass of the present invention is twice of existing market sale ledrite, reaches the ad eundem level of 316 stainless steels,
And cutting ability is two to three times of stainless steel product, the miniaturization, lighting and cost degradation of product are realized, has obtained the country
The extensive concern of international counterparts.
Brief description of the drawings
Fig. 1 is easy-cutting lead-free graphite brass preparation method flow road of the present invention figure；
Fig. 2 is easy-cutting lead-free graphite brass cutting swarf SEM-EDS energy spectrum diagrams of the present invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description, but the present invention is not limited to
These embodiments.
The easy-cutting lead-free graphite brass of the present invention includes copper, zinc, graphite, chromium, iron, tin, titanium and impurity element；Its each member
Element and content are：Copper 53.25-59.85wt.%, zinc 38-41wt.%, graphite 0.5-3wt.%, chromium 0.55-0.75wt.%, iron
0.1-0.3wt.%, tin 0.50-1.00wt.%, titanium 0.5-0.7%, impurity element are less than 0.4wt.%.
In above-mentioned element, graphite particle is a kind of kollag, has good wearability, can be played in brass
Lubrication and the effect of chip breaking, lead can be substituted and improve cutting ability, there is the characteristics of small environmental pollution, inexpensive, aboundresources.Tin
Have the function that to improve Dezincification corrosion resistant performance, cutting ability and mechanical performance, when Theil indices are less than 0.50wt.%, solid solution is strong
Change and the DeGrain of resistance to dezincification, when Theil indices are more than 1.00wt.%, the processability of this alloy can be influenceed, therefore Theil indices are
0.50-1.00wt.%.Chromium, iron rise in this alloy improves Dezincification corrosion resistant performance, crystal grain thinning, increase alloy strength, plasticity
And stress corrosion resistant ability.
The preparation of the unleaded graphite brass is as shown in figure 1, be specially：
Particle size range is weighed in 30-50 μm of each material powder, copper powder 53.25-59.85wt.%, zinc powder 38-
41wt.%, graphite powder 0.5-3wt.%, chromium powder 0.55-0.75wt.%, iron powder 0.1-0.3wt.%, glass putty 0.50-
1.00wt.%, titanium valve 0.5-0.7% (total impurities are less than 0.4wt.%)；By Cu powder, Fe powder, Sn powder, Ti powder, Cr powder and Zn
Powder adds intermediate frequency furnace, is melted under 1600-1700K and is incubated solid solution 50-70min, obtains CuZnCrFeSnTi supersaturation
It is dissolved brass alloys.Using water atomization, metal drop is sprayed to using high-pressure water mist, liquid dissolved drip is under the impact of high-pressure water mist
It is broken for tiny drop and cools down rapidly, solidifies, is prepared into Braze alloy powder.The present invention is in pressure 8-10MPa, temperature
Under the conditions of 1273-1673K, jet size 10mm, CuZnCrFeSnTi super saturated solid solution alloys are prepared into super saturated solid solution Huang
Copper alloy powder, powder diameter are controlled at 150-250 μm.Braze alloy powder is mixed into 1- with graphite powder using vibratory milling method
3 hours, rotating speed 300-450rpm, ratio of grinding media to material 1-3：1, obtain the mixed-powder that particle diameter is not more than 10 μm.Using hydraulic press,
Mixed-powder is pressed into bar stock under 500-700MPa, 673-873K, by the blank suppressed in the Muffle furnace for thering is nitrogen to protect
20-40min is sintered under the conditions of middle 1000-1100K, then furnace cooling to below 350-400K.Heat and forge in 950K-1150K
Make, 773-873K homogenizing annealings.Blank by annealing is preheated to 800-900K, hot extrusion is carried out and is extruded
Base, then unleaded graphite brass rod of the invention is made by drawing.
The preparation method of easy-cutting lead-free graphite brass of the present invention is further illustrated with embodiment below.
Embodiment 1
Particle diameter is weighed in 30-50 μm of copper powder 59.85wt.%, zinc powder 38wt.%, graphite powder 0.5wt%, chromium powder
0.55wt%, iron powder 0.1wt.%, glass putty 0.5wt.%, titanium valve 0.5wt.%.By Cu powder, Fe powder, Sn powder, Cr powder, Zn powder and
Ti powder is added in intermediate frequency furnace, is melted in 1600K, and is incubated 50min and is carried out solution treatment.Then in pressure 8MPa, temperature
Under the conditions of 1673K, jet size 10mm, particle size is prepared in 150-250 μm of super saturated solid solution by water atomization
CuZnCrFeSnTi brass powders；Prepared Braze alloy powder is mixed 3 hours with graphite powder using vibratory milling method, turned
Fast 450rpm, ratio of grinding media to material 1：1.Using 200t hydraulic presses, mixed powder is pressed into diameter under the conditions of pressure 500MPa, temperature 873K
50mm bar stock, the blank suppressed is sintered into 20min in the Muffle furnace for having nitrogen to protect under the conditions of 1000K, then with stove
It is cooled to below 350K.Blank after hot pressed sintering is in 950K heats forgeds, the processing of 773K homogenizing annealings.Base after heat treatment
Material is preheated to 800K, by being extruded in 2500T extruders, obtains diameter 30mm extruded stock, then obtain diameter by drawing
28mm drawing bar.
The specific component content of the alloy is：Copper 59.85wt.%, zinc 38wt.%, graphite 0.5wt%, chromium 0.55wt%,
Iron 0.1wt.%, tin 0.5wt.%, titanium 0.5wt.%.
Embodiment 2
The preparation method and process of unleaded graphite brass are same as Example 1, weigh particle diameter in 30-50 μm of copper powder
56.89wt.%, zinc powder 40wt.%, graphite powder 0.9wt%, chromium powder 0.75wt%, iron powder 0.2wt.%, glass putty 0.6wt.%,
Titanium valve 0.66wt.%.Cu powder, Fe powder, Sn powder, Cr powder, Zn powder and Ti powder are added in intermediate frequency furnace, melted under 1673K,
60min solution treatment is incubated, the supersaturated brass alloys that solution treatment obtains are passed through into water atomization, pressure 9MPa, temperature
1373K, jet size 10mm, particle diameter 150-250um Braze alloy powder is made, by prepared Braze alloy powder with
0.9wt% graphite powders are mixed 3 hours, rotating speed 400rpm using vibratory milling method, ratio of grinding media to material 2：1.Using 200t hydraulic presses, pressing
Mixed powder is pressed into diameter 50mm bar stock, by the blank suppressed in the Muffle furnace for thering is nitrogen to protect under the conditions of power 600MPa
30min is sintered under the conditions of 1050K, then furnace cooling to below 380K.Blank after hot pressed sintering in 973K heats forgeds,
The processing of 805K homogenizing annealings.Blank after heat treatment is preheated to 873k, by being extruded in 2500T extruders, obtains diameter
30mm extruded stock, then obtain diameter 28mm drawing bar by drawing.
The concrete content of the alloy is：Copper 56.89wt.%, zinc 40wt.%, graphite 0.9wt%, chromium 0.75wt%, iron
0.2wt.%, tin 0.6wt.%, titanium 0.66wt.%.
Embodiment 3
The preparation method and process of unleaded graphite brass are same as Example 1, weigh particle diameter in 30-50 μm of copper powder
56.84wt.%, zinc powder 40wt.%, graphite powder 1.0wt%, chromium powder 0.7wt%, iron powder 0.2wt.%, glass putty 0.6wt.%, titanium
Powder 0.66wt.%, Cu powder, Fe powder, Sn powder, Cr powder, Zn powder and Ti powder are added in intermediate frequency furnace, melted under 1673K, protected
Warm 60min solution treatment, the supersaturated brass alloys that solution treatment obtains are passed through into water atomization, pressure 9MPa, temperature
1373K, jet size 10mm, particle diameter 150-250um Braze alloy powder is made, by prepared Braze alloy powder with
1.0wt% graphite powders are mixed 2 hours, rotating speed 400rpm using vibratory milling method, ratio of grinding media to material 2：1.Using 200t hydraulic presses, pressing
Mixed powder is pressed into diameter 50mm bar stock, by the blank suppressed in the Muffle furnace for thering is nitrogen to protect under the conditions of power 600MPa
30min is sintered under the conditions of 1050K, then furnace cooling to below 380K.Blank after hot pressed sintering in 973K heats forgeds,
The processing of 803K homogenizing annealings.Blank after heat treatment is preheated to 873k, by being extruded in 2500T extruders, obtains diameter
30mm extruded stock, then obtain diameter 28mm drawing bar by drawing.
The concrete content of the alloy is：Copper 56.84wt.%, zinc 40wt.%, graphite 1.0wt%, chromium 0.7wt%, iron
0.2wt.%, tin 0.6wt.%, titanium 0.66wt.%.
Embodiment 4
The preparation method and process of unleaded graphite brass are same as Example 1, weigh particle diameter in 30-50 μm of copper powder
53.25wt.%, zinc powder 41wt.%, graphite powder 3wt%, chromium powder 0.75wt%, iron powder 0.3wt.%, glass putty 1wt.%, titanium valve
0.7wt.%, Cu powder, Fe powder, Sn powder, Cr powder, Zn powder and Ti powder are added in intermediate frequency furnace, melted under 1700K, be incubated
70min solution treatment, by the supersaturated brass alloys that solution treatment obtains by water atomization, pressure 10MPa, temperature 1273K,
Jet size 10mm, particle diameter 150-250um Braze alloy powder is made, by prepared Braze alloy powder and 3wt% stones
Ink powder is mixed 3 hours, rotating speed 300rpm using vibratory milling method, ratio of grinding media to material 3：1.Using 200t hydraulic presses, in pressure 700MPa,
Mixed powder is pressed into diameter 50mm bar stock, by the blank suppressed in the Muffle furnace for thering is nitrogen to protect under the conditions of temperature 673K
40min is sintered under the conditions of 1100K, then furnace cooling to below 400K.Blank after hot pressed sintering in 1150K heats forgeds,
The processing of 873K homogenizing annealings.Blank after heat treatment is preheated to 900K, by being extruded in 2500T extruders, obtains diameter
30mm extruded stock, then obtain diameter 28mm drawing bar by drawing.
The concrete content of the alloy is：Copper 53.25wt.%, zinc 41wt.%, graphite 3wt%, chromium 0.75wt%, iron
0.3wt.%, tin 1wt.%, titanium 0.7wt.%.
By the detection and analysis to drawing bar of the present invention, the tensile strength for obtaining prepared unleaded graphite brass exists
740-795MPa, yield strength are better than 316L stainless steels in 670-700MPa, elongation after fracture 9%-12%, mechanical property
(the tensile strength 620MPa, yield strength 310MPa of 316L stainless steels), cutting rate 0.2-0.4mm/s is the 2-3 of stainless steel
Again (stainless steel is in 0.12-0.2mm/s).Cutting obtained stratiform copper scale has good chip removal ability, by the microcosmic of copper scale
Tissue carries out EDS energy spectrum analysis, as shown in Fig. 2 graphite is uniformly dispersed in alloy, is advantageous to improve the machinability of alloy
Energy.
When content of graphite is 0.9wt.%, the tensile strength of drawing bar is 767MPa, elongation after fracture 10.2%, is cut
Cut speed 0.23mm/s.When content of graphite is 1wt.%, the tensile strength of lead-free reflow is 750MPa, elongation after fracture 9.9%,
Cutting rate 0.30mm/s.As can be seen that as content of graphite raises, elongation after fracture and mechanical property have declined but still
Higher level is maintained at, cutting ability is obviously improved so that when content of graphite is higher, the lead-free reflow is more suitable for doing Big Steel Castings
Part.
Claims (6)
1. a kind of preparation method of easy-cutting lead-free graphite brass, it is characterised in that comprise the following steps：
Step 1, solution treatment
Weigh material powder respectively, wherein, Cu powder 53.25-59.85wt.%, Zn powder 38-41wt.%, graphite powder 0.5-3wt.%,
Cr powder 0.55-0.75wt.%, Sn powder 0.50-1.00 wt.%, Ti powder 0.5-0.7% and Fe powder 0.1-0.3wt.%, by Cu powder,
Fe powder, Sn powder, Ti powder, Cr powder and Zn powder melt under 1600-1700K, and are incubated solid solution 50-70min, obtain
CuZnCrFeSnTi super saturated solid solution brass alloys；
Step 2, powder processed
CuZnCrFeSnTi super saturated solid solution alloys are prepared into super saturated solid solution Braze alloy powder, by super saturated solid solution brass
Alloy powder mixes with graphite powder, and the mixed-powder of uniform particle sizes is made；
Step 3, hot pressed sintering
Mixed-powder is first pressed into bar stock, places into and sinters 20-40min in Muffle furnace under the conditions of 1000-1100K, Ran Housui
Stove is cooled to below 350-400K；
Step 4, forged, hot pressing, drawing successively, obtains unleaded graphite brass, the unleaded graphite brass includes following quality
The element of percentage：Copper 53.25-59.85wt.%, zinc 38-41wt.%, graphite 0.5-3wt.%, chromium 0.55-0.75wt.%, iron
0.1-0.3wt.%, tin 0.50-1.00 wt.%, titanium 0.5-0.7 wt.%, above element mass percent summation is 100%, described
Forging is specially：In 950-1150K heats forgeds, 773-873K homogenizing annealings.
2. the preparation method of easy-cutting lead-free graphite brass according to claim 1, it is characterised in that mistake described in step 2
The particle diameter of saturation solid solution Braze alloy powder is at 150-250 μm.
3. the preparation method of easy-cutting lead-free graphite brass according to claim 2, it is characterised in that mistake described in step 2
Saturation solid solution Braze alloy powder uses water atomization, and its pressure is 8-10MPa, temperature 1273-1673K, and jet size is
10mm。
4. the preparation method of easy-cutting lead-free graphite brass according to claim 1, it is characterised in that mixed described in step 2
The particle diameter for closing powder is not more than 10 μm.
5. the preparation method of easy-cutting lead-free graphite brass according to claim 4, it is characterised in that mistake described in step 2
Saturation is dissolved Braze alloy powder and prepares mixed-powder, ball milling 1-3 hours, rotating speed 300- using vibratory milling method with graphite powder
450rpm, ratio of grinding media to material 1-3：1.
6. the preparation method of easy-cutting lead-free graphite brass according to claim 1, it is characterised in that former described in step 1
The particle diameter at feed powder end is at 30-50 μm.
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| US11440094B2 (en) | 2018-03-13 | 2022-09-13 | Mueller Industries, Inc. | Powder metallurgy process for making lead free brass alloys |
| US11459639B2 (en) | 2018-03-13 | 2022-10-04 | Mueller Industries, Inc. | Powder metallurgy process for making lead free brass alloys |
| CN108893647B (en) * | 2018-07-18 | 2020-09-01 | 上海电机学院 | High-strength corrosion-resistant wear-resistant copper-based composite material |
| CN110499436A (en) * | 2019-08-22 | 2019-11-26 | 西安理工大学 | Unleaded high-strength Cutting free titanium enhancing graphite brass of one kind and preparation method thereof |
| IT202000004480A1 (en) * | 2020-03-03 | 2021-09-03 | A L M A G S P A Azienda Lavorazioni Metallurgiche E Affini Gnutti | PROCESS FOR OBTAINING A BRASS BILLET WITH A REDUCED LEAD CONTENT AND BILLET SO OBTAINED |
| CN114369739B (en) * | 2021-12-14 | 2022-08-26 | 江西理工大学 | Preparation method and device of lead-free graphite brass composite material |
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| US4191564A (en) * | 1977-11-24 | 1980-03-04 | Chuetsu Metal Works Co., Ltd. | Brass having superior adhesion and wear resistant properties |
| CN102844451A (en) * | 2010-04-23 | 2012-12-26 | 株式会社栗本铁工所 | Copper alloy for sliding member |
| CN104372199A (en) * | 2014-11-25 | 2015-02-25 | 浙江三瑞铜业有限公司 | Lead-free environment-friendly silicon brass |
| CN104911395A (en) * | 2015-06-29 | 2015-09-16 | 南昌大学 | Lead-free free-cutting manganese-containing graphite brass and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4191564A (en) * | 1977-11-24 | 1980-03-04 | Chuetsu Metal Works Co., Ltd. | Brass having superior adhesion and wear resistant properties |
| CN102844451A (en) * | 2010-04-23 | 2012-12-26 | 株式会社栗本铁工所 | Copper alloy for sliding member |
| CN104372199A (en) * | 2014-11-25 | 2015-02-25 | 浙江三瑞铜业有限公司 | Lead-free environment-friendly silicon brass |
| CN104911395A (en) * | 2015-06-29 | 2015-09-16 | 南昌大学 | Lead-free free-cutting manganese-containing graphite brass and preparation method thereof |
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