CN115305382A - Lead-free-cutting brass and preparation method thereof - Google Patents
Lead-free-cutting brass and preparation method thereof Download PDFInfo
- Publication number
- CN115305382A CN115305382A CN202110521119.3A CN202110521119A CN115305382A CN 115305382 A CN115305382 A CN 115305382A CN 202110521119 A CN202110521119 A CN 202110521119A CN 115305382 A CN115305382 A CN 115305382A
- Authority
- CN
- China
- Prior art keywords
- lead
- brass
- weight percent
- cutting
- free
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 119
- 229910001369 Brass Inorganic materials 0.000 title claims abstract description 106
- 239000010951 brass Substances 0.000 title claims abstract description 106
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 51
- 239000010949 copper Substances 0.000 claims abstract description 48
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 31
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052802 copper Inorganic materials 0.000 claims abstract description 30
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 27
- 239000011230 binding agent Substances 0.000 claims abstract description 27
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 27
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 27
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 20
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000011701 zinc Substances 0.000 claims abstract description 8
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 239000011593 sulfur Substances 0.000 claims abstract description 6
- 239000011812 mixed powder Substances 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 31
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 20
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical group [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 18
- 239000012190 activator Substances 0.000 claims description 17
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 150000002910 rare earth metals Chemical class 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000000956 alloy Substances 0.000 abstract description 20
- 229910045601 alloy Inorganic materials 0.000 abstract description 19
- 238000010923 batch production Methods 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 description 44
- 239000011572 manganese Substances 0.000 description 42
- 238000012360 testing method Methods 0.000 description 34
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 24
- 229910052748 manganese Inorganic materials 0.000 description 24
- 230000008569 process Effects 0.000 description 22
- 238000007546 Brinell hardness test Methods 0.000 description 16
- 238000001739 density measurement Methods 0.000 description 16
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 16
- 238000012545 processing Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 10
- 230000002829 reductive effect Effects 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000004663 powder metallurgy Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910001181 Manganese brass Inorganic materials 0.000 description 1
- 241001275902 Parabramis pekinensis Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- FAWGZAFXDJGWBB-UHFFFAOYSA-N antimony(3+) Chemical compound [Sb+3] FAWGZAFXDJGWBB-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- SKKNACBBJGLYJD-UHFFFAOYSA-N bismuth magnesium Chemical compound [Mg].[Bi] SKKNACBBJGLYJD-UHFFFAOYSA-N 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0089—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with other, not previously mentioned inorganic compounds as the main non-metallic constituent, e.g. sulfides, glass
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to lead-free-cutting brass and a preparation method thereof, wherein the brass comprises the following components: 48.0 to 70.0 weight percent of copper, 0.2 to 0.4 weight percent of aluminum, 2.2 to 4.0 weight percent of antimony, 0.4 to 2.7 weight percent of manganese, 0.02 to 0.2 weight percent of cerium, 0.001 to 0.1 weight percent of lanthanum, 0.1 to 0.2 weight percent of sulfur, and the balance of zinc and impurities with the content not more than 0.5 weight percent. During preparation, various powders and the binder are mixed, ball-milled, immediately pressed and sintered to obtain a lead-free-cutting brass finished product. The alloy disclosed by the invention does not contain lead, is environment-friendly, has a simple production process, and is suitable for large-scale batch production.
Description
Technical Field
The invention relates to lead-free-cutting brass and a preparation method thereof, belonging to the field of metal material preparation.
Background
The lead brass has the characteristics of excellent cold and hot processability, excellent cutting performance, self-lubrication and the like, and can meet the machining requirements of parts in various shapes, so the lead brass is widely accepted as an important basic material all the time and widely applied to the fields of castings and accessories of civil water supply systems, electronics, automobiles, mechanical manufacturing and the like. The solubility of lead in brass melts is high and the solid solubility in copper is almost zero, so that when the lead brass melt solidifies, lead precipitates to form dispersed and fine lead particles. Lead has the characteristic of being brittle but not hard, on the other hand, it has a melting point of only 327.5 ℃, and when lead brass is machined, the resulting temperature rise makes the lead particles softer, and when lead brass is machined, these dispersed soft lead particles act as a void in the brass, acting as a stress concentration source, creating a so-called "notch effect" which results in the chips being prone to fracture there. In addition, the contact part of the cutting head and the cutting chips is instantly melted due to the heat generated by the cutting process, which is helpful for changing the shape of the cutting chips and plays a role of lubricating the cutter, thereby reducing the abrasion of the cutting head to the minimum. Therefore, the lead plays the roles of chip breaking, bonding and welding reducing and cutting speed increasing in the cutting process of the free-cutting brass material, the cutting efficiency can be greatly improved, and the service life of the cutter can be prolonged. The presence of lead in free-cutting lead brass is decisive for its cutting properties, but on the other hand is detrimental to the use properties of lead brass. After the lead brass spare and accessory parts are scrapped, a plurality of small parts are discarded as garbage, and only a small amount of small parts are recycled. The waste lead brass is in contact with soil, and lead contained in the waste lead brass enters the soil under the long-term action of rainwater and atmosphere, so that the soil and a water source are polluted. When the waste lead brass is used as garbage for incineration, lead vapor is emitted into the atmosphere, which causes great harm to human bodies, so that the application of the waste lead brass is increasingly strictly limited. Lead is neither solid-soluble in copper nor forms intermetallic compounds with copper, but exists in the form of elemental particles at grain boundaries. Lead in the lead-containing copper alloy is slowly precipitated in the form of ions under the action of impurities, organic acid and the like in drinking water, and the existing lead-containing copper alloy is difficult to meet the requirements of environmental protection laws. In order to reduce the harmful effect of lead, researchers have conducted systematic studies on the corrosion mechanism of drinking water on brass and the corrosive influence of additive elements on brass, and have taken various measures, such as adding alloy elements such as tin and nickel to improve the corrosion resistance of lead brass, or removing soluble lead and then covering the surface of the removed lead with metals such as chromium or adopting other methods to inhibit the leaching of lead. These methods do not fundamentally eliminate the deleterious effects of lead, due to the presence of lead in brass throughout.
From both environmental laws and regulations at home and abroad and from the perspective of technical economy, the improvement of repairing and mending the lead brass has no value, and only the development of novel lead-substituting brass is provided. The research on metals, alloys and compounds has a long-term accumulated process, and the characteristics of the research are quite rich. The addition of bismuth, antimony, magnesium, phosphorus, sulfur and other elements to brass has been well recognized for improving cutting performance, and numerous patents have been published at home and abroad, such as: a lead-free-cutting brass alloy material and a manufacturing method thereof, CN02121991.5; lead-free-cutting brass alloy, CN200310109162.0; an ecological environment-friendly novel leadless free-cutting low-stibium-bismuth brass alloy and a manufacturing method thereof, CN200510050425.4; lead-free copper alloy, CN200610005689.2; a lead-free-cutting magnesium bismuth brass alloy, CN200710098481.4; a lead-free-cutting magnesium silicon brass CN200910042723.7; a cast leadless free-cutting brass CN200910044315.5. It should be noted that all of the lead-free-cutting brasses currently have unsatisfactory cutting properties, and have a phenomenon that the workability and the usability are reduced to different degrees, as compared with free-cutting lead brass. Especially, in the processing of brass small-sized spare parts and special-shaped parts, the requirements of scientific research and production practice on the properties of casting, cutting and the like of the brass are far from being met. There is a need for a new brass material to meet the processing requirements of brass small-sized pieces and shaped pieces. The present invention has been developed in view of this need.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the lead-free-cutting brass with good cutting performance; the invention also aims to provide a preparation method of the lead-free-cutting brass.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the lead-free-cutting brass comprises the following components:
48.0 to 70.0 weight percent of copper,
0.2 to 0.4 weight percent of aluminum,
2.2 to 4.0 weight percent of antimony,
0.4 to 2.7 weight percent of manganese,
0.02 to 0.2 weight percent of cerium,
0.001 to 0.1wt% of lanthanum,
0.1-0.2wt% of sulfur, and the balance of zinc and impurities with the content not more than 0.5 wt%.
Further, the lead-free-cutting brass comprises the following components:
50.0-68.0wt% of copper,
0.25 to 0.35 weight percent of aluminum,
0.5 to 2.5 weight percent of manganese,
0.04-0.18wt% of cerium,
0.002-0.09wt% of lanthanum,
0.12 to 0.18 weight percent of sulfur, and the balance of zinc and impurities with the content of not more than 0.5 weight percent.
A preparation method of lead-free-cutting brass comprises the following steps:
s1, providing mixed powder, wherein the mixed powder comprises the following components: 54.0 to 70.0 weight percent of copper, 0.3 to 0.4 weight percent of aluminum, 0.1 to 0.3 weight percent of manganese, 0.03 to 0.09 weight percent of cerium, 0.01 to 0.03 weight percent of lanthanum and the balance of zinc;
providing an activator consisting of: 2-5wt% of mixed rare earth and 95-98wt% of antimony powder, wherein the mixed rare earth is prepared from cerium and lanthanum according to the weight ratio of 3:1 by mass ratio;
s2, mixing the mixed powder, the manganese sulfide powder, the activator and the binder according to a ratio of 92.6-96.4:0.4-2.4:2.2-4:1, ball-milling for 4-8h, further ball-milling for 6h to obtain raw material powder, and then pressing and forming to obtain a pressed blank;
wherein, during ball milling, the mass ratio of the material balls is 8-12;
and S3, placing the pressed blank obtained in the step S2 in a protective atmosphere, heating to 830-850 ℃, preserving heat for 4-6h, and then cooling with water (cooling to room temperature) to obtain a lead-free-cutting brass finished product.
Further, in S1, the particle size of the mixed powder is not more than 74 μm, and is further not more than 64 μm.
Further, in S1, the particle size of the activator is 74 μm or less, and further 64 μm or less.
In S2, the granularity of the manganese sulfide powder is less than or equal to 10 mu m, and is further less than or equal to 8 mu m.
Further, in S2, the binder is zinc stearate.
Further, in S3, the time for raising the temperature to the target temperature is controlled to be 4-6 hours, and further 5 hours.
Further, in S3, the temperature is raised to 835-845 ℃, and the temperature is kept for 4.5-5.5h.
Further, the protective atmosphere is a hydrogen atmosphere.
The invention can effectively solve the problem that lead brass pollutes the environment, and provides the low-cost lead-free-cutting brass and the preparation method thereof for small structural members in the fields of electronic devices, water heating bathrooms, clocks and watches and the like.
The applicant's principle of the invention is intended to be explained as follows:
the alpha phase region is obviously reduced by the aluminum, and when the aluminum content is high, the gamma phase appears, so that the strength and the hardness of the alloy are improved, but the plasticity is greatly reduced. In the aluminum brass, the surface ionization tendency of aluminum is greater than that of zinc, and a dense and strong aluminum oxide film is preferentially formed, which prevents further oxidation of the alloy. Aluminum improves the castability of brass by increasing its fluidity, but aluminum is detrimental to improving the dezincification ability of brass. The aluminum is cheap, the cost of the brass can be reduced, and the market competitiveness of the brass is improved. The aluminum content of the invention is controlled between 0.2wt% and 0.4wt%, and the balance between the strength, the hardness, the plasticity and the dezincification resistance of the brass and the cost can be achieved.
The solubility of antimony in copper decreases rapidly with decreasing temperature, and if the content of antimony is less than 0.1%, brittle Cu is formed 2 Sb is distributed in a network shape in a crystal boundary, so that the cold processing performance of the brass is greatly reduced. The solution treatment improves the cold workability of the antimony-containing brass due to the greater solubility of antimony in copper at high temperatures. On the other hand, the addition of a small amount of rare earth elements can improve Cu 2 The net structure of Sb reduces the adverse effect on the cold processing performance of brass. Brittle Cu 2 Sb particles are advantageous for chip breaking, and thus antimony is very advantageous for improving the cutting workability of brass. Antimony also causes hot brittleness of the copper alloy, and excessively high antimony deteriorates hot workability of brass, which is disadvantageous for hot working, resulting in an increase in the cost of the article. In the invention, antimony powder is used as an activated sintering agent, and the distribution form in the sintered brass has the following characteristics: liquid phase is generated in the sintering process, and the liquid phase is separated along manganese sulfide particles and a crystal boundary under the action of capillary force, partial antimony is separated by the manganese sulfide to form discontinuous antimony particles, partial antimony is dissolved in the crystal, and other part of antimony forms intermetallic compound particles with alloy elements such as copper. The content of antimony in the brass alloy is controlled to be 2.2-4.0wt%, so that the cutting processing performance of brass is obviously optimized, and the cost is very high in market competitiveness.
Although manganese is an element for reducing the alpha phase region, the effect is not obvious, and the influence on the brass structure is not large. Manganese has a solid solution strengthening effect on brass and can greatly enhance the corrosion resistance of brass to seawater, chlorides and superheated steam. The manganese brass has quite good processing performance. Manganese is added mainly for improving the corrosion resistance of the alloy and the solid solution strengthening effect of manganese on brass is utilized. The manganese content should not be too high during the casting process, and is preferably controlled below 0.4%, otherwise higher manganese content leads to increased alloy hardness and reaction with silicon to form high hardness bulk Mn 5 Si 3 The compound is not favorable for cutting processing of the alloy. In the present invention, the brass is made into powder, and even if more manganese is added, the occurrence of large particles can be avoidedBulk Mn 5 Si 3 The compound does not deteriorate the machinability of the alloy. In the invention, part of manganese mainly exists in the form of manganese sulfide particles, and makes a main contribution to the improvement of the cutting performance.
The rare earth metal can also be modified and refined to be a gamma phase, so that the gamma phase is uniformly distributed, the cutting performance is improved, and the adverse effect of gamma phase on plasticity is reduced; in addition, the method also has the function of purifying grain boundaries and reducing the harmful effect of impurities on the grain boundaries. However, rare earth is extremely easy to oxidize, and even a trace amount of rare earth is added, the fluidity of the alloy is obviously reduced. The rare earth elements are a large series, different rare earth elements have obviously different effects, costs and the like in brass, and how to select proper rare earth elements and the optimal content is huge in a large amount of work. The invention optimizes the contents of cerium and lanthanum of 0.02-0.2wt% and 0.001-0.1wt% of rare earth, and achieves the optimal combination of content, effect and cost.
Manganese sulfide has the characteristics of being relatively brittle and relatively soft. The manganese sulfide particles with fine particles are dispersed in the brass, and can play a role of chip breaking when the brass is subjected to cutting processing. Meanwhile, the manganese sulfide particles with fine particles can also play a role in lubricating the cutting tool, so that the cutting efficiency is improved. The manganese sulfide sintered brass is excellent lead-free-cutting brass and has great application prospect.
Powder metallurgy is suitable for producing products with the same shape and a large number of products, particularly products in small and special shapes. Powder metallurgy products often leave a certain amount of porosity, and the porosity can be controlled under appropriate process conditions. The free-cutting brass has small influence on mechanical properties due to certain porosity, but has favorable influence on the processing properties, and the optimization of the porosity in the powder metallurgy free-cutting brass has important practical significance. When brass is machined, the chips break at the hole. The presence of pores is very advantageous for improving cutting performance. However, if the porosity is too large, the mechanical properties of the brass are greatly reduced, and the effect of improving the cutting performance is not significant. The activation sintering is to adopt certain physical or chemical measures in the sintering process, so that the sintering temperature is greatly reduced, the sintering time is obviously shortened, and the performance of a sintered body is improved. The lead-free-cutting brass piece produced by the activation sintering method has good economic and social benefits.
The invention mainly has the following three mechanisms for improving the cutting processing performance of the brass: one is the fine, brittle, softer manganese sulfide particles, which have a chip-breaking effect in the alloy. When brass is machined, the chips hit a hole in the manganese sulfide powder under the action of the cutting tool, and the chips are broken. Secondly, the brittle and soft microparticles formed in the activation sintering process of antimony and the brittle intermetallic compound particles generated by the reaction with copper and the like obviously improve the cutting performance of brass; thirdly, a proper amount of pores in the powder metallurgy product are very beneficial to cutting processing, and the micropores can play a chip breaking role in the cutting processing process of the brass product. It can be said that the micropores act much better as chip breakers than all the other particles, where the chip is subjected to almost zero resistance. The invention greatly improves the cutting performance under the comprehensive action of the three chip breaking mechanisms.
And respectively taking a test sample to test the Brinell hardness, the cutting performance and the porosity of the alloy.
The parameters of the cutting processing technology for brass are as follows: the front angle of the cutter is 4 degrees; the cutting speed is 1.5mm/min; the feeding amount is 1.5mm/min; the rotating speed of the main shaft is 600r/min. Collecting all cuttings during cutting, sieving the cuttings with a 30-mesh sieve, weighing the mass of all the cuttings and the mass of undersize fines, and calculating the percentage of the fines. The density of the brass is measured by an Archimedes drainage method, and then the porosity of the brass is calculated according to the theoretical density and the measured density.
Compared with the prior art, the invention has the following beneficial effects:
1) Realizes the lead-free of the free-cutting brass, does not contain lead in the alloy components, and is environment-friendly.
2) The antimony element which effectively improves the cutting performance of the brass is utilized, and the alloy has excellent cutting processing performance under the multiple comprehensive action of manganese sulfide, antimony and pores.
3) The production process is simple and reliable, is suitable for large-scale batch production, and is particularly suitable for small pieces and special-shaped pieces, and the production cost is very low.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 54.0% of copper (Cu), 0.4% of aluminum (Al), 0.1% of manganese (Mn), 0.09% of cerium (Ce), 0.03% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 0.4%, the mass fraction of the binder zinc stearate is 1%, the activator (formed by mixing antimony powder and mixed rare earth according to the mass ratio of 97.5 to 2.5, wherein the mixed rare earth consists of 75% of cerium and 25% of lanthanum, the same below) is 3%, and the balance is mixed powder. Mixing powder by adopting a planetary ball mill, wherein the mass ratio of material balls is 10. The sintering process comprises the following steps: heating is carried out from room temperature to the sintering temperature for 5 hours so as to sufficiently remove the binder. The sintering temperature is 830 ℃, and the sintering time is 5 hours. The sintering atmosphere is hydrogen atmosphere. And after sintering, quickly cooling to room temperature. Through comparison of a Brinell hardness test, a density measurement test and a cutting test, the sintered lead-free-cutting brass has the Brinell hardness of HB95.3, the percentage of fine chips of 21.5 percent, the porosity of 5.6 percent and the cutting performance equivalent to 67 percent of HPb 59-1.
Example 2:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 54.0% of copper (Cu), 0.2% of aluminum (Al), 0.2% of manganese (Mn), 0.09% of cerium (Ce), 0.03% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.0%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 3%, and the balance is mixed powder. Mixing powder by adopting a planetary ball mill, wherein the mass ratio of material balls is 10. The sintering process comprises the following steps: heating was started from room temperature to the sintering temperature for 5 hours to sufficiently remove the binder. The sintering temperature is 840 ℃ and the sintering time is 6 hours. The sintering atmosphere is hydrogen atmosphere. And after sintering, rapidly cooling to room temperature. Through comparison of a Brinell hardness test, a density measurement test and a cutting test, the sintered lead-free-cutting brass has the Brinell hardness of HB96.9, the percentage of fine chips of 22.6 percent, the porosity of 5.4 percent and the cutting performance equivalent to 71 percent of HPb 59-1.
Example 3:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 54.0% of copper (Cu), 0.4% of aluminum (Al), 0.1% of manganese (Mn), 0.06% of cerium (Ce), 0.02% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.6%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 3%, and the balance is mixed powder. Mixing powder by adopting a planetary ball mill, wherein the mass ratio of material balls is 10. The sintering process comprises the following steps: heating was started from room temperature to the sintering temperature for 5 hours to sufficiently remove the binder. The sintering temperature is 830 ℃, and the sintering time is 6 hours. The sintering atmosphere is hydrogen atmosphere. And after sintering, rapidly cooling to room temperature. Through comparison of a Brinell hardness test, a density measurement test and a cutting test, the sintered lead-free-cutting brass has the Brinell hardness of HB95.9, the percentage of fine chips of 21.8 percent, the porosity of 5.5 percent and the cutting performance equivalent to 68 percent of HPb 59-1.
Example 4:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 54.0% of copper (Cu), 0.4% of aluminum (Al), 0.1% of manganese (Mn), 0.03% of cerium (Ce), 0.01% of lanthanum (La) and the balance of zinc (Zn). The powder preparation comprises 2.4% of manganese sulfide powder, 1% of binder zinc stearate, 2.2% of activating agent and the balance of mixed powder. Mixing powder by adopting a planetary ball mill, wherein the mass ratio of material balls is 10. The sintering process comprises the following steps: heating was started from room temperature to the sintering temperature for 5 hours to sufficiently remove the binder. The sintering temperature is 830 ℃, and the sintering time is 4 hours. The sintering atmosphere is hydrogen atmosphere. And after sintering, quickly cooling to room temperature. Through comparison of a Brinell hardness test, a density measurement test and a cutting test, the sintered lead-free-cutting brass has the Brinell hardness of HB95.5, the percentage of fine chips of 20.9 percent, the porosity of 5.6 percent and the cutting performance equivalent to 66 percent of HPb 59-1.
Example 5:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 59% of copper (Cu), 0.4% of aluminum (Al), 0.3% of manganese (Mn), 0.06% of cerium (Ce), 0.02% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 0.4%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 4%, and the balance is mixed powder. Mixing powder by adopting a planetary ball mill, wherein the mass ratio of material balls is 10. The sintering process comprises the following steps: heating was started from room temperature to the sintering temperature for 5 hours to sufficiently remove the binder. The sintering temperature is 840 ℃ and the sintering time is 4 hours. The sintering atmosphere is hydrogen atmosphere. And after sintering, rapidly cooling to room temperature. Through comparison of a Brinell hardness test, a density measurement test and a cutting test, the sintered lead-free-cutting brass has the Brinell hardness of HB96.2, the percentage of fine chips of 20.8 percent, the porosity of 5.8 percent and the cutting performance of 70 percent equivalent to that of HPb 59-1.
Example 6:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 59% of copper (Cu), 0.3% of aluminum (Al), 0.2% of manganese (Mn), 0.09% of cerium (Ce), 0.03% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.0%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 4%, and the balance is mixed powder. Mixing powder by adopting a planetary ball mill, wherein the mass ratio of material balls is 10. The sintering process comprises the following steps: heating was started from room temperature to the sintering temperature for 5 hours to sufficiently remove the binder. The sintering temperature is 840 ℃ and the sintering time is 5 hours. The sintering atmosphere is hydrogen atmosphere. And after sintering, quickly cooling to room temperature. Through comparison of a Brinell hardness test, a density measurement test and a cutting test, the sintered lead-free-cutting brass has the Brinell hardness of HB96.9, the percentage of fine chips of 22.5 percent, the porosity of 5.8 percent and the cutting performance equivalent to 72 percent of HPb 59-1.
Example 7:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 59% of copper (Cu), 0.4% of aluminum (Al), 0.1% of manganese (Mn), 0.09% of cerium (Ce), 0.03% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.6%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 4%, and the balance is mixed powder. By adopting the process of example 5 and through comparison of a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB95.1, the percentage of fine chips is 21.2%, the porosity is 5.4%, and the cutting performance is equivalent to 71% of that of HPb 59-1.
Example 8:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 59% of copper (Cu), 0.4% of aluminum (Al), 0.3% of manganese (Mn), 0.03% of cerium (Ce), 0.01% of lanthanum (La) and the balance of zinc (Zn). The powder preparation comprises 2.4% of manganese sulfide powder, 1% of binder zinc stearate, 3% of activating agent and the balance of mixed powder. By adopting the process of example 2 and comparing a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB95.0, the percentage of fine chips is 21.0%, the porosity is 5.5%, and the cutting performance is equivalent to 69% of that of HPb 59-1.
Example 9:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 65% of copper (Cu), 0.4% of aluminum (Al), 0.2% of manganese (Mn), 0.06% of cerium (Ce), 0.02% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 0.4%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 3%, and the balance is mixed powder. By adopting the process of example 1 and through comparison of a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB94.8, the percentage of fine chips is 21.1%, the porosity is 5.5%, and the cutting performance is equivalent to 68% of that of HPb 59-1.
Example 10:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 65% of copper (Cu), 0.4% of aluminum (Al), 0.2% of manganese (Mn), 0.09% of cerium (Ce), 0.03% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.0%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 4%, and the balance is mixed powder. By adopting the process of example 3 and through comparison of a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB95.9, the percentage of fine chips is 21.4%, the porosity is 5.7%, and the cutting performance is equivalent to 70% of that of HPb 59-1.
Example 11:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 65% of copper (Cu), 0.4% of aluminum (Al), 0.1% of manganese (Mn), 0.06% of cerium (Ce), 0.02% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.6%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 3%, and the balance is mixed powder. By adopting the process of example 2 and through comparison of a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB96.0, the percentage of fine chips is 20.9%, the porosity is 5.5%, and the cutting performance is equivalent to 69% of that of HPb 59-1.
Example 12:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 65% of copper (Cu), 0.4% of aluminum (Al), 0.1% of manganese (Mn), 0.03% of cerium (Ce), 0.01% of lanthanum (La) and the balance of zinc (Zn). The powder preparation comprises 2.4% of manganese sulfide powder, 1% of binder zinc stearate, 3% of activating agent and the balance of mixed powder. By adopting the process of example 1 and comparing a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB95.4, the percentage of fine chips is 21.4%, the porosity is 5.6%, and the cutting performance is equivalent to 67% of HPb 59-1.
Example 13:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 70% of copper (Cu), 0.4% of aluminum (Al), 0.3% of manganese (Mn), 0.03% of cerium (Ce), 0.01% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 0.4%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 2.2%, and the balance is mixed powder. By adopting the process of example 1 and through comparison of a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB95.1, the percentage of fine chips is 21.1%, the porosity is 5.5%, and the cutting performance is equivalent to 66% of HPb 59-1.
Example 14:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 70% of copper (Cu), 0.4% of aluminum (Al), 0.2% of manganese (Mn), 0.06% of cerium (Ce), 0.01% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.0%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 3%, and the balance is mixed powder. By adopting the process of example 3 and through comparison of a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB95.6, the percentage of fine chips is 21.6%, the porosity is 5.7%, and the cutting performance is equivalent to 68% of that of HPb 59-1.
Example 15:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 70% of copper (Cu), 0.4% of aluminum (Al), 0.3% of manganese (Mn), 0.03% of cerium (Ce), 0.01% of lanthanum (La) and the balance of zinc (Zn). When the powder is prepared, the mass fraction of the manganese sulfide powder is 1.6%, the mass fraction of the binder zinc stearate is 1%, the mass fraction of the activator is 3%, and the balance is mixed powder. By adopting the process of example 3 and comparing a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB95.5, the percentage of fine chips is 21.4%, the porosity is 5.6%, and the cutting performance is equivalent to 67% of HPb 59-1.
Example 16:
the mixed powder of the embodiment comprises the following components (all in mass fraction): 70% of copper (Cu), 0.4% of aluminum (Al), 0.1% of manganese (Mn), 0.03% of cerium (Ce), 0.01% of lanthanum (La) and the balance of zinc (Zn). The powder preparation comprises 2.4% of manganese sulfide powder, 1% of binder zinc stearate, 2.2% of activating agent and the balance of mixed powder. By adopting the process of example 1 and through comparison of a Brinell hardness test, a density measurement test and a cutting test, the Brinell hardness of the sintered lead-free-cutting brass is HB94.8, the percentage of fine chips is 20.7%, the porosity is 5.3%, and the cutting performance is equivalent to 65% of that of HPb 59-1.
The above examples are set forth so that this disclosure will be understood in all instances to be considered illustrative and not restrictive, and that various modifications and equivalent arrangements may be devised by those skilled in the art after reading this disclosure and are intended to be included within the scope of the appended claims.
Claims (8)
1. The lead-free-cutting brass is characterized by comprising the following components:
48.0 to 70.0 weight percent of copper,
0.2 to 0.4 weight percent of aluminum,
2.2 to 4.0 weight percent of stibium,
0.4 to 2.7 weight percent of manganese,
0.02 to 0.2 weight percent of cerium,
0.001 to 0.1wt% of lanthanum,
0.1-0.2wt% of sulfur, and the balance of zinc and impurities with the content not more than 0.5 wt%.
2. The lead-free-cutting brass according to claim 1, wherein the lead-free-cutting brass consists of the following components:
50.0-68.0wt% of copper,
0.25 to 0.35 weight percent of aluminum,
0.5 to 2.5 weight percent of manganese,
0.04-0.18wt% of cerium,
0.002-0.09wt% of lanthanum,
0.12 to 0.18 weight percent of sulfur, and the balance of zinc and impurities with the content of not more than 0.5 weight percent.
3. A preparation method of lead-free-cutting brass is characterized by comprising the following steps:
s1, providing mixed powder, wherein the mixed powder comprises the following components: 54.0-70.0wt% of copper, 0.3-0.4wt% of aluminum, 0.1-0.3wt% of manganese, 0.03-0.09wt% of cerium, 0.01-0.03wt% of lanthanum and the balance of zinc;
providing an activator consisting of: 2-5wt% of mixed rare earth and 95-98wt% of antimony powder, wherein the mixed rare earth is prepared from cerium and lanthanum according to the weight ratio of 3:1 by mass ratio;
s2, mixing the mixed powder, the manganese sulfide powder, the activating agent and the binder according to a ratio of 92.6-96.4:0.4-2.4:2.2-4:1, ball-milling for 4-8 hours to obtain raw material powder, and then pressing and forming to obtain a pressed blank;
wherein, during ball milling, the mass ratio of the material balls is 8-12;
and S3, placing the pressed blank obtained in the step S2 in a protective atmosphere, heating to 830-850 ℃, preserving heat for 4-6 hours, and cooling by water to obtain a lead-free-cutting brass finished product.
4. The method according to claim 3, wherein the particle size of the mixed powder in S1 is 74 μm or less.
5. The method according to claim 3, wherein the particle size of the activator in S1 is 74 μm or less.
6. The method according to claim 3, wherein the manganese sulfide powder in S2 has a particle size of 10 μm or less.
7. The production method according to any one of claims 3 to 6, wherein in S2, the binder is zinc stearate.
8. The method according to any one of claims 3 to 6, wherein the time for raising the temperature to the target temperature in S3 is controlled to be 4 to 6 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521119.3A CN115305382A (en) | 2021-05-13 | 2021-05-13 | Lead-free-cutting brass and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521119.3A CN115305382A (en) | 2021-05-13 | 2021-05-13 | Lead-free-cutting brass and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115305382A true CN115305382A (en) | 2022-11-08 |
Family
ID=83854238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110521119.3A Pending CN115305382A (en) | 2021-05-13 | 2021-05-13 | Lead-free-cutting brass and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115305382A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709406A (en) * | 2009-11-23 | 2010-05-19 | 路达(厦门)工业有限公司 | Manganese dioxide unleaded cutting brass and preparation method thereof |
| CN101805841A (en) * | 2009-11-23 | 2010-08-18 | 中南大学 | Rare earth oxide unleaded free-cutting brass and preparation method thereof |
| CN102634688A (en) * | 2011-02-10 | 2012-08-15 | 湖南特力新材料有限公司 | Leadless free-cutting copper alloy and preparation method |
| CN105518163A (en) * | 2013-09-04 | 2016-04-20 | 湖南特力新材料有限公司 | Lead-free high-sulphur easy-cutting alloy containing manganese and copper and preparation method therefor |
| CN112567057A (en) * | 2018-08-27 | 2021-03-26 | 湖南特力新材料有限公司 | Lead-free superhard self-lubricating copper alloy and manufacturing method thereof |
-
2021
- 2021-05-13 CN CN202110521119.3A patent/CN115305382A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709406A (en) * | 2009-11-23 | 2010-05-19 | 路达(厦门)工业有限公司 | Manganese dioxide unleaded cutting brass and preparation method thereof |
| CN101805841A (en) * | 2009-11-23 | 2010-08-18 | 中南大学 | Rare earth oxide unleaded free-cutting brass and preparation method thereof |
| CN102634688A (en) * | 2011-02-10 | 2012-08-15 | 湖南特力新材料有限公司 | Leadless free-cutting copper alloy and preparation method |
| CN105518163A (en) * | 2013-09-04 | 2016-04-20 | 湖南特力新材料有限公司 | Lead-free high-sulphur easy-cutting alloy containing manganese and copper and preparation method therefor |
| CN112567057A (en) * | 2018-08-27 | 2021-03-26 | 湖南特力新材料有限公司 | Lead-free superhard self-lubricating copper alloy and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6239767B2 (en) | Lead-free, high-sulfur and easy-to-cut copper-manganese alloy and method for preparing the same | |
| CN101285137B (en) | Leadless and free-cutting brass containing magnesium and manufacturing method for manufactures | |
| CN101768683B (en) | High-strength corrosion-resistant free-machining brass alloy and manufacturing method thereof | |
| JP2007517981A (en) | Lead-free free-cutting brass alloy containing antimony | |
| CN105624463A (en) | Lead-free free-cutting brass alloy and preparation method thereof | |
| EP3360982B1 (en) | Aluminum oxide dispersion strengthened (ods) non-lead free cutting brass and manufacturing method therefor | |
| CN103789574A (en) | Low-copper alloy, and production method and use thereof | |
| CN102477496B (en) | Method for preparing unleaded free-cutting brass | |
| CN110747369A (en) | Lead-free-cutting silicon-magnesium-calcium brass alloy and preparation method thereof | |
| CN101805841B (en) | Rare earth oxide unleaded free-cutting brass and preparation method thereof | |
| TWI550105B (en) | Lead - free bismuth - free silicon - brass alloy | |
| CN101709406B (en) | Manganese dioxide unleaded cutting brass and preparation method thereof | |
| CN115305382A (en) | Lead-free-cutting brass and preparation method thereof | |
| CN101812610B (en) | Low-lead and easy-cutting casting brass | |
| KR100864909B1 (en) | A free-cutting copper alloy | |
| CN102796917A (en) | High-strength brass alloy and preparation method thereof | |
| KR100555854B1 (en) | Lead-Free cutting bronze alloy | |
| CN101624667B (en) | Sintered leadless free-cutting brass and preparation method thereof | |
| CN115305381A (en) | Lead-free-cutting brass alloy and manufacturing process thereof | |
| KR100519556B1 (en) | Brass alloys which maintain a golden color and manufacturing method thereof | |
| CN110938761B (en) | Low-lead free-cutting magnesium brass alloy and preparation method thereof | |
| JP2020050914A (en) | Lead-free free-cutting phosphor bronze rod wire | |
| KR20070101916A (en) | Composition of unleaded free cutting brass with advanced dezincification resistance | |
| KR20120042483A (en) | Brass alloy with corrosion resistance containing little lead | |
| CN115652141B (en) | Preparation method of low-cost free-cutting antibacterial titanium alloy and titanium alloy faucet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20221108 |