CN101265531A - Method for producing granule structure hard alloy with multiple groups of different components - Google Patents
Method for producing granule structure hard alloy with multiple groups of different components Download PDFInfo
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- CN101265531A CN101265531A CNA2007100486113A CN200710048611A CN101265531A CN 101265531 A CN101265531 A CN 101265531A CN A2007100486113 A CNA2007100486113 A CN A2007100486113A CN 200710048611 A CN200710048611 A CN 200710048611A CN 101265531 A CN101265531 A CN 101265531A
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Abstract
The invention relates to a method for producing hard alloy with multiple crumb structures of different components. The method comprises the steps of ball milling, compounding, preparing prealloy bulk and prealloy powder, adding Co and sintering, ball milling, and adding Co and sintering. In the inventive method, the Co is added after compounding and sintering to obtain prealloy powder, so as to overcome the shortcomings including follow-up sintering difficulty, and high porosity and high friability of product due to spray granulation and sintered alloy crumbs; and then sintering, crushing, ball milling, Co adding and sintering are performed, so as to obtain hard alloy product with high Co content, in which the metallurgical structure is multiple crumb structures of different components. Therefore, the inventive method can produce hard alloy product with 2 or 3 crumb structures of different components; and the obtained product has the advantages of wide application range, high hardness, high abrasion resistance (good consistency with high ductility), good anti-fracture performance and integrated mechanical performance, and low production equipment investment and production cost.
Description
Technical field
The invention belongs to the production method of hard metal article, particularly a kind of production method of the Wimet that constitutes by the granule of many groups of (multistage) different ratios hard phases, bonding phase.The hard metal article that adopts this method to produce can be widely used as cast iron class cutting tool, metal stretching mould and press tool, wear-resisting part, measurer in addition, and petroleum geology probing, mine and colliery digging instrument etc.
Background technology
Conventional WC-Co based hard alloy material, WC be mutually disperse be distributed in Co mutually in, its metallographic structure is even, mechanical property is consistent.And along with the refinement of hard phase (WC) granularity, intensity, hardness increase substantially.Correspondingly because hard is mutually too thin, cobalt phase average free path is little, thereby deformability is poor, and metallographic structure is even in addition, and resistance to fracture is lower.Thereby the uniform Wimet based article of this structure exists the contradiction that is difficult to coordinate between high rigidity, high-wearing feature and the obdurability.Promptly the content of cobalt (Co) is when improving its hardness and wear resistance in reducing alloy, and the toughness of alloy body promptly descends thereupon, otherwise then influences its hardness and wear resistance.As for hard metal articles such as cutting tip, metal stretching mould and press tool, mine and colliery digging instrument, petroleum geology boring tools, in use not only required to have very high hardness and wear resistance, but also required to possess stronger toughness.In case and the goods of metallographic structure unanimity in use crack on the surface, its crackle is with very fast expansion and cause whole worker, mold breakdown and scrap.At my Ba Ma university (ALABMA) of the above-mentioned defective U.S. in Ph D dissertation " relation between its microtexture-performance of dual structure Wimet " (author XIN DENG 2002), disclose a kind of WC and Co powder of at first adopting and mix, mix wax, be made into contain Co 6wt% mix the wax compound; To mix the wax compound then and adopt spray method to make the granule of band wax, through 250～500 ℃ of pre-burning dewaxings, the granule after the dewaxing becomes the alloying granule at 1200 ℃ of sintering temperatures again; Gained alloying granule simply mixes to be made into the Co powder again and always contains the compound that Co amount reaches 16wt%, at last this compound is placed in the hot-pressed sintering furnace, sinters the Wimet that contains Co 6wt% and contain dual (2 groups) crumb structure of Co16wt% under temperature that is lower than liquid phase and 35MPa pressure.The hard metal article that this method is produced with dual microcosmic crumb structure, in case though overcome to a certain extent be difficult between the existing high rigidity of hard metal article, high-wearing feature and the obdurability that metallographic structure is even, mechanical property is consistent coordinate and in use the surface crack, its crackle causes disadvantages such as alloy body breaks, scraps with very fast expansion.But have one, can only prepare the Wimet of dual (2 groups) different components crumb structure, the gradient (gap) of Co content can not be too big in two compositions of forming a team between the grain, improves otherwise influence the goods over-all properties; Two, adopt spray method to make the granule of band wax, again through pre-burning dewaxing and alloying sintering, gained alloying granule is hollow structure, has both increased the difficulty of subsequent technique alloy sintering, will cause the porosity height of alloy product, fragility to strengthen again; Three, granulate its facility investment costliness, production cost height of spray method; Etc. defective.Therefore, adopt the also difficult better goods of comprehensive mechanical performance that obtain of this method.
Summary of the invention
The objective of the invention is defective, a kind of production methods of research and design with many group different components crumb structure Wimet at the background technology existence.With the contradiction that is difficult to coordinate between the existing high rigidity of the conventional hard metal article of balance, high-wearing feature and the obdurability, reduce the porosity and the fragility of goods, under the hardness of goods, condition that wear resistance does not descend, increase substantially its fracture toughness property; Reach the comprehensive mechanical performance and the range of application of effective raising goods, reduce purposes such as investment in production equipment and production cost
Solution of the present invention is at first to adopt raw material WC powder and Co powder to be made into low Co content powder mix, again through sintering the prealloy piece into, then its broken also ball milling is made first group of prealloy powder with low Co crumb structure; And then in prealloy powder, add Co powder to the second and form a team after the burl reconstruct contains Co amount, mixes, hot pressed sintering becomes alloy block (or really connect hot pressed sintering become to have two groups of different hard metal articles that become to do crumb structure directly use) in the graphite jig of packing into; Again ball milling after the alloy block fragmentation is become powder and in powder, add the Co powder and finally contain the Co amount, place the graphite jig vacuum heating-press sintering to make hard metal article mixed powder after mixing with three groups of different components crumb structure to intend producing alloy product; Thereby realize its purpose.Thereby the inventive method comprises;
A, ball milling batching: in total dosage, the industrial WC powder of 90-96wt% and the Co powder of 4-10wt% are placed in the ball mill, the ball milling mixing got mixed powder in 36-76 hour;
B, system prealloy piece: be pressed into briquet after forming agent, the ball milling that adds the heavy 1-2wt% of powder in mixed powder mixes, send into then in the sintering oven, under 1380-1460 ℃ of temperature and vacuum or hydrogen shield sintering 6-12 hour, the prealloy piece;
C, system prealloy powder: behind the head with gained prealloy piece Mechanical Crushing to≤5mm, send into then in the ball mill after ball milling 12-24 hour, the prealloy powder selected between the 80-160 order of sieving is stand-by;
D, secondary are joined Co and sintering: adding Co powder to total Co content in the prealloy powder is that 12-18wt%, ball milling mixing are after 8-12 hour, pack in the graphite jig and send in the sintering oven, under 10-25MPa pressure and vacuum or hydrogen shield solid state sintering 1-3 hour, must have the hard alloy blocks of 2 groups of different components crumb structure or the hard metal article that can directly use;
E, ball milling: will be by D operation gained alloy block Mechanical Crushing to≤5.0mm, send in the ball mill after ball milling 16-24 hour again, sieve and select the powder between the 100-180 order stand-by;
F, join Co and sintering three times: with the mixing of E operation gained powder ball milling after 6-12 hour; placing powder mix in the ball mill and adding Co powder to total Co content is that 20-28wt%, ball milling mixing are after 6-12 hour; powder mix is placed graphite jig and send in the sintering oven; under 10-25MPa and vacuum or hydrogen shield solid state sintering 1-3 hour, furnace cooling, the alloy product that must have 3 groups of different components crumb structure.
Above-mentioned E operation is heated 750-900 ℃ and carries out carrying out Mechanical Crushing again after the Water Quenching, to improve its crushing efficiency before alloy block carries out Mechanical Crushing.And described solid state sintering, its sintering temperature is 1100-1280 ℃.
The present invention is owing to sintering the prealloy piece into after WC and the Co powder batching, become prealloy powder to join Co again through broken, ball milling; Effectively overcome background technology and ooze cured mixed powder, mist projection granulating, dewaxing pre-burning,, must join Co behind the alloying granule at 1200 ℃ of left and right sides sintering temperatures because of employing.Existing facility investment is big, and it is bigger that the alloying granule is hollow ball structure, follow-up sintering difficulty, goods porosity height, fragility, and can only be used for the defectives such as goods that fixture has two groups of different or part crumb structure; The inventive method is joined Co, sintering by sintering crushing, ball milling again, has the hard metal articles that high cobalt content and metallographic structure are many group different components crumb structure thereby make.Thereby, the present invention has institute's article of manufacture applied range, high conformity between high rigidity, high-wearing feature and obdurability, anti-fracture toughness property and comprehensive mechanical performance are good, investment in production equipment and production cost are low, both can produce and had 2 groups, can produce characteristics such as Wimet again with 3 groups of different components crumb structure.
Embodiment
Embodiment 1:A, ball milling batching: 188kgWC powder and 12kgCo powder (being the industrial production powder) were placed the interior ball milling of ball mill 48 hours, get mixed powder;
B, system prealloy piece: adding concentration is 10% forming agent rubber solutions 3.0kg in A operation gained mixed powder, after mixing, ball milling is pressed into 10 * 4 * 5mm (long * wide * thick) briquet, send into then in the sintering oven, got the prealloy piece in 10 hours at hydrogen shield and 1420 ℃ ± 20 ℃ sintering temperatures;
C, system prealloy powder: at first gained prealloy piece is sent into alligator and be crushed to granularity≤5mm, send into ball milling in the ball mill after 24 hours then, the powder 198.0kg that selects between the 80-160 order of sieving is stand-by;
D, join Co and sintering: will send in the ball mill by C operation gained prealloy powder and 23.5kgCo powder, ball mill mixes after 10 hours, pack in the graphite jig and send in the vacuum heating-press sintering stove, 18MPa pressure and 1200 ℃ of sintering temperatures 2.0 hours, must have 2 groups of different components crumb structure, always contain the Co amount and be the hard alloy blocks of 16wt%;
E, ball milling: after at first will sending into 30 minutes to 800 ℃ of retort furnace internal heating, place quenching-in water to handle immediately by D operation gained alloy block, be crushed to≤5mm through alligator then, send into the interior ball milling of ball mill 20 hours again, sieve and select 100-180 purpose powder 219kg;
F, join Co and sintering: send into E operation gained powder in the ball mill and add 16.3kg Co powder, ball milling mixed after 8 hours, place graphite to bore the tooth mould powder mix and send in the vacuum heating-press sintering stove, 20MPa pressure and 1250 ℃ of sintering temperatures 2 hours, always contain the Co amount and be 22wt%, carbide drill tooth goods with 3 groups of different components crumb structure.
These goods are after testing: density 13.0g/cm
3, bending strength 2200kg/mm
2, hardness (HRA) is 82.6, fracture toughness property 25.0MPa.m
1/2
Embodiment 2: wherein A, B, C operation and parameter thereof are all identical with embodiment 1;
D, secondary are joined Co and sintering: the C operation gained prealloy powder and the 23.5kgCo sphere of powder were ground mixing after 10 hours, place the pricker sheet graphite jig, send in the vacuum sintering furnace, 20MPa pressure and 1250 ℃ of sintering temperatures 2.0 hours, always contain the Co amount and be the carbide filler sheet articles of 16wt%.
These goods are after testing: density 13.9g/cm
3, bending strength 1800kg/mm
2Hardness (HRA) 84.0, fracture toughness property 22.0MPam
1/2
Claims (3)
1. one kind has the production methods of organizing different components crumb structure Wimet more, comprising:
A, ball milling batching: in total dosage, the industrial WC powder of 90-96wt% and the Co powder of 4-10wt% are placed in the ball mill, in the ball mill, ball milling mixings 36-76 hour, must mixed powder;
B, system prealloy piece: be pressed into briquet after forming agent, the ball milling that adds powder 1-2wt% in mixed powder mixes, send into then in the sintering oven, under 1380-1460 ℃ of temperature and vacuum or hydrogen shield sintering 6-12 hour, the prealloy piece;
C, system prealloy powder: first trip will be by B operation gained prealloy piece Mechanical Crushing to≤5mm, sends into ball mill endosphere mill in the ball mill after 12-36 hour then, the prealloy powder selected between the 80-160 order of sieving is stand-by;
D, secondary are joined Co and sintering: adding Co powder to total Co content in the prealloy powder is 12-18wt%, after ball milling mixing 8-12 hour, pack in the graphite jig and send in the sintering oven, under 10-25MPa pressure and vacuum or hydrogen shield solid state sintering 1-3 hour, must have the hard alloy blocks of 2 groups of different components crumb structure or the hard metal article that can directly use;
E, ball milling: will send in the ball mill again by D operation gained alloy block Mechanical Crushing to≤5.0mm, behind the ball milling 16-24 hour, sieve and select the powder between the 100-180 order stand-by:
F, join Co and sintering three times: placing E operation gained powder in the ball mill and adding Co powder to total Co content is 20-28wt%; after ball milling mixing 6-12 hour; powder mix is placed graphite jig and send in the sintering oven; under 10-25MPa and vacuum or hydrogen shield solid state sintering 1-3 hour, furnace cooling promptly got the alloy product with 3 groups of different components crumb structure.
2. by the production method of the described Wimet of claim 1, it is characterized in that before alloy block carries out Mechanical Crushing, being heated 750-900 ℃ in the E operation, carry out carrying out Mechanical Crushing again after the Water Quenching;
3. by the production method of the described Wimet of claim 1, it is characterized in that described solid state sintering temperature is 1100-1280 ℃.
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| CN 200710048611 CN101265531B (en) | 2007-03-13 | 2007-03-13 | Method for producing granule structure hard alloy with multiple groups of different components |
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| CN 200710048611 CN101265531B (en) | 2007-03-13 | 2007-03-13 | Method for producing granule structure hard alloy with multiple groups of different components |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102319903A (en) * | 2011-08-05 | 2012-01-18 | 北京北矿锌业有限责任公司 | Preparation method for hollow microspheres |
| CN103014872A (en) * | 2012-12-12 | 2013-04-03 | 江西旭阳雷迪高科技股份有限公司 | Crushing method of solar silicon wafer doping agent |
| CN106498256A (en) * | 2016-10-31 | 2017-03-15 | 四川理工学院 | A kind of hard alloy of the non-homogeneous composition of microcosmic and structure and preparation method thereof |
| CN111185591A (en) * | 2020-02-18 | 2020-05-22 | 北京科技大学广州新材料研究院 | TiC high manganese steel composite material and preparation method thereof |
| CN111270121A (en) * | 2020-03-27 | 2020-06-12 | 赣州有色冶金研究所 | Preparation method and application of hard alloy with net-shaped structure |
| CN111926204A (en) * | 2020-08-10 | 2020-11-13 | 河南荣泰耐火材料有限公司 | Microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy product |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280438C (en) * | 2003-10-13 | 2006-10-18 | 中国科学院金属研究所 | Process for preparing superfine carboloy |
| CN100390312C (en) * | 2006-07-14 | 2008-05-28 | 北京工业大学 | Prepn process of high-performance superfine crystal hard WC-10 wt.% Co alloy |
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2007
- 2007-03-13 CN CN 200710048611 patent/CN101265531B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319903A (en) * | 2011-08-05 | 2012-01-18 | 北京北矿锌业有限责任公司 | Preparation method for hollow microspheres |
| CN102319903B (en) * | 2011-08-05 | 2013-04-03 | 北京北矿锌业有限责任公司 | Preparation method for hollow microspheres |
| CN103014872A (en) * | 2012-12-12 | 2013-04-03 | 江西旭阳雷迪高科技股份有限公司 | Crushing method of solar silicon wafer doping agent |
| CN106498256A (en) * | 2016-10-31 | 2017-03-15 | 四川理工学院 | A kind of hard alloy of the non-homogeneous composition of microcosmic and structure and preparation method thereof |
| CN106498256B (en) * | 2016-10-31 | 2017-12-19 | 四川理工学院 | A kind of microcosmic non-homogeneous composition and the hard alloy of structure and preparation method thereof |
| CN111185591A (en) * | 2020-02-18 | 2020-05-22 | 北京科技大学广州新材料研究院 | TiC high manganese steel composite material and preparation method thereof |
| CN111185591B (en) * | 2020-02-18 | 2022-05-10 | 北京科技大学广州新材料研究院 | TiC high manganese steel composite material and preparation method thereof |
| CN111270121A (en) * | 2020-03-27 | 2020-06-12 | 赣州有色冶金研究所 | Preparation method and application of hard alloy with net-shaped structure |
| CN111270121B (en) * | 2020-03-27 | 2021-01-05 | 赣州有色冶金研究所 | Preparation method and application of hard alloy with net-shaped structure |
| CN111926204A (en) * | 2020-08-10 | 2020-11-13 | 河南荣泰耐火材料有限公司 | Microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy product |
| CN111926204B (en) * | 2020-08-10 | 2021-11-16 | 河南荣泰耐火材料有限公司 | Microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy product |
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