CN102443714A - Preparation method for superfine hard alloy - Google Patents
Preparation method for superfine hard alloy Download PDFInfo
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- CN102443714A CN102443714A CN2010105009485A CN201010500948A CN102443714A CN 102443714 A CN102443714 A CN 102443714A CN 2010105009485 A CN2010105009485 A CN 2010105009485A CN 201010500948 A CN201010500948 A CN 201010500948A CN 102443714 A CN102443714 A CN 102443714A
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Abstract
The invention discloses a preparation method for a superfine hard alloy, comprising the following specific steps of: mixing superfine powders according to a certain ratio at first, then performing a high-energy ball milling and a press-moulding, finally sintering at 1420 DEG C in a vacuum sintering furnace. The hard alloy prepared by the method disclosed by the invention has the performances of high strength, high hardness, high wear resistance, high red hardness, high thermal conductivity and the like, and is suitable for the electronic industry, metal cutting tools and the products obtained by grinding-machining with a high precision etc.
Description
Technical field
The present invention relates to a kind of preparation method of wimet, belong to field of powder metallurgy.
Background technology
Wimet is to produce with powder metallurgy process; The wimet of forming by the carbide and the soft bonded metal of hard; Carbide is that alloy provides the ability and the wear resistance of bearing load, and bonded metal then gives wimet impact-resistant toughness because of the viscous deformation under its room temperature.Insoluble metal carbide and the ductility that it has combined high firmness is the advantage of bonded metal preferably, thereby has high intensity and hardness, a series of premium propertiess such as wear resistance is good, and red hardness is good, and thermal expansivity is little, and Young's modulus height and chemicalstability are good.Its primary process is the preparation powder, suppresses, and is configured as the pressed compact of certain size, becomes required finished product at the sintering temperature that is lower than its basic constituent element fusing point then.Wimet is a hard brittle material, exists contradiction between its hardness and the intensity: hardness height then intensity is low, and intensity height then hardness is low.Germany scientist H.Gleiter successfully developed nano crystal material first in 1984; Opened up new era of material history; Discover, under the constant situation of the bonding phase content of cobalt, when WC grain drops to 1 μ m when following; Hardness and intensity improve simultaneously, and the amplitude that improves is more obvious along with reducing of grain fineness number.This be because, the wimet grain fineness number is more little, the mfp of bonding phase is short more, the intensity of matrix and hardness are high more, reach (being ultra-fine size) after 0.1～0.6 μ m as if grain fineness number, its hardness and intensity will have big breakthrough.
Ultra-fine cemented carbide is because of having premium propertiess such as HS, high firmness, high-wearing feature, high red hardness, and its Application Areas constantly enlarges.But because the raw materials used WC powder granularity of ultra-fine cemented carbide is very thin, have very high chemistry, be easy to nature and reunite; Be unfavorable for that in the ball milling of powder ball milling is even; Ultrafine powder has high sintering activity, in sintering process, is prone to the inhomogeneous problems such as grow up of WC grain, and its ingredient requirement is high; The production difficulty is big, has a strong impact on applying of ultra-fine cemented carbide.
The method of making ultra-fine cemented carbide at present is mainly takes the superfine WC powder, superfine Co powder, and add a certain amount of grain inhibitor.Wherein the preparation method of ultrafine WC powder mainly contains direct carborization, hydrogen reducing WO
XCarborization, fluid bed reduction and carbonization method, the grain inhibitor of interpolation mainly contains: VC, Cr
3C
2, NbC, TaC, TiC, ZrC, Mo
2C and HfC etc.The present invention is through a large amount of experiments, and the integrated practice experience, sums up out a kind of ultrafine hard alloy preparation method.
Summary of the invention
The present invention is primarily aimed at ultra-fine cemented carbide and in mechanical milling process, reunites easily, and characteristics such as problem such as in sintering process, be prone to grow up are taked different measures, and its process mainly comprises the preparation of powder, high-energy ball milling, and four steps of compression moulding and vacuum sintering:
(1) earlier ultrafine powder is carried out a certain proportion of mixed powder that is mixed with;
(2) mixed powder being carried out high-energy ball milling handles;
(3) powder compression after the ball-milling processing is become green compact;
(4) green compact are carried out vacuum sintering;
Further being characterized as of ultrafine hard alloy preparation method of the present invention:
(1) ultrafine powder is the ultrafine WC powder, and granularity is 0.4 μ m, ultra-fine Co powder, and granularity is 1.0 μ m, suppressor factor (VC, Cr
3C
2, mass ratio is 1: 1), wherein the Co powder is 8.0wt%, and suppressor factor is 0.4～0.6%, and all the other are ultrafine WC;
(2) with the mixed powder for preparing; In planetary ball mill, carrying out high-energy ball milling handles; Ball-milling medium is an absolute ethyl alcohol, and drum's speed of rotation is 200～400r/min, and milling time is 24～36h; Mill ball is the ultra-fine cemented carbide ball of diameter of phi 6mm, and ball-to-powder weight ratio (wt%) is 50: 1～100: 1;
(3) powder for drying after utilizing vacuum drying oven with ball milling is pressed on the 200T pressing machine after adding 80% DS rubber-moulding agent drying;
(4) green compact of compression moulding sinter molding in vacuum sintering furnace, wherein vacuum tightness is 1～5Pa, sintering temperature is 1420 ℃, insulation 30min;
The invention has the advantages that: the wimet that this method is produced has high firmness; HS; H.T.; High heat conductance and high wear resisting property are suitable for the processing of boring, timber and the composite floor board of printed substrate in the processing, electronic industry of the superalloy in the aeronautical material, the high strength and high hardness fields such as syringe needle of dot-matrix printer.
Embodiment
Instance 1: take by weighing ultrafine WC powder 91.5g, the Co powder is 8.0g, and suppressor factor (VC, Cr3C2, mass ratio are 1: 1) 0.5g is mixed with mixed powder.With the mixed powder for preparing, in planetary ball mill, carry out high-energy ball milling and handle, wherein ball-milling medium is an absolute ethyl alcohol; Drum's speed of rotation is 400r/min; Milling time is 36h, and mill ball is a diameter of phi 8mm ultra-fine cemented carbide ball, and ball-to-powder weight ratio (wt%) is 100: 1.Powder for drying after utilizing vacuum drying oven with ball milling adds 80% DS rubber-moulding agent, and dry back is pressed on the 200T pressing machine.The green compact of compression moulding sinter molding in vacuum sintering furnace, wherein vacuum tightness is 1～5Pa, sintering temperature is 1420 ℃, insulation 30min.
Instance 2: take by weighing ultrafine WC powder 183.0g, the Co powder is 16.0g, and suppressor factor (VC, Cr3C2, mass ratio are 1: 1) 1g is mixed with mixed powder.With the mixed powder for preparing, in planetary ball mill, carry out high-energy ball milling and handle, wherein ball-milling medium is an absolute ethyl alcohol; Drum's speed of rotation is 200r/min; Milling time is 24h, and mill ball is the ultra-fine cemented carbide ball of diameter of phi 8mm, and ball-to-powder weight ratio (wt%) is 50: 1.Powder for drying after utilizing vacuum drying oven with ball milling is added 80% DS rubber-moulding agent, and dry back is pressed on the 200T pressing machine.The green compact of compression moulding sinter molding in vacuum sintering furnace, wherein vacuum tightness is 1～5Pa, sintering temperature is 1420 ℃, insulation 30min.
Claims (2)
1. a ultrafine hard alloy preparation method is characterized in that process mainly comprises the preparation of powder, high-energy ball milling, and four steps of compression moulding and vacuum sintering:
(1) earlier ultrafine powder is carried out a certain proportion of mixed powder that is mixed with;
(2) mixed powder being carried out high-energy ball milling handles;
(3) powder compression after the ball-milling processing is become green compact;
(4) green compact are carried out vacuum sintering.
2. ultrafine hard alloy preparation method process according to claim 1, its further characteristic is:
(1) ultrafine powder is the ultrafine WC powder, and granularity is 0.4 μ m, ultra-fine Co powder, and granularity is 1.0 μ m, suppressor factor (VC, Cr
3C
2, mass ratio is 1: 1), wherein the Co powder is 8.0wt%, and suppressor factor is 0.4～0.6%, and all the other are ultrafine WC;
(2) with the mixed powder for preparing; In planetary ball mill, carrying out high-energy ball milling handles; Ball-milling medium is an absolute ethyl alcohol, and drum's speed of rotation is 200～400r/min, and milling time is 24～36h; Mill ball is the ultra-fine cemented carbide ball of diameter of phi 6mm, and ball-to-powder weight ratio (wt%) is 50: 1～100: 1;
(3) powder for drying after utilizing vacuum drying oven with ball milling is pressed on the 200T pressing machine after adding 80% DS rubber-moulding agent drying;
(4) green compact of compression moulding sinter molding in vacuum sintering furnace, wherein vacuum tightness is 1～5Pa, sintering temperature is 1420 ℃, insulation 30min.
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|---|---|---|---|
| CN2010105009485A CN102443714A (en) | 2010-10-09 | 2010-10-09 | Preparation method for superfine hard alloy |
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| CN2010105009485A CN102443714A (en) | 2010-10-09 | 2010-10-09 | Preparation method for superfine hard alloy |
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|---|---|---|---|---|
| CN102806346A (en) * | 2012-07-16 | 2012-12-05 | 株洲同一实业有限公司 | Forming method for hard alloy anvil |
| CN103911536A (en) * | 2014-04-02 | 2014-07-09 | 成都工具研究所有限公司 | Cr containing high-grade steel hard alloy cutter material for petroleum pipeline thread machining |
| CN104480336A (en) * | 2014-12-11 | 2015-04-01 | 陕西理工学院 | Preparation method of high temperature-resistant high-strength WC-Co-Ti3SiC2 hard alloy material |
| CN104480334A (en) * | 2014-11-28 | 2015-04-01 | 江西稀有稀土金属钨业集团有限公司 | Preparation method of nanoscale hard alloy |
| CN106032555A (en) * | 2015-03-18 | 2016-10-19 | 中国科学院宁波材料技术与工程研究所 | Granular material and preparation method thereof |
| CN106271489A (en) * | 2016-08-29 | 2017-01-04 | 河源富马硬质合金股份有限公司 | A kind of carbide bit and manufacture method thereof |
| CN107447154A (en) * | 2017-07-06 | 2017-12-08 | 徐州市瑜擎工程机械有限公司 | A kind of mining instrument hard alloy and preparation method thereof |
| CN108103344A (en) * | 2018-01-11 | 2018-06-01 | 湖南科技大学 | One kind (W, Mo2)C-Al2O3Composite granule and preparation method thereof |
| CN108117392A (en) * | 2017-12-04 | 2018-06-05 | 株洲夏普高新材料有限公司 | Corrosion resistant non-bond cemented carbide and preparation method thereof |
| CN111139389A (en) * | 2020-01-10 | 2020-05-12 | 株洲金剑硬质合金有限公司 | Preparation method of hard alloy cutter material for processing plates |
| CN114250396A (en) * | 2021-11-19 | 2022-03-29 | 成都美奢锐新材料有限公司 | Superfine low-cobalt hard alloy material for wood processing and preparation method thereof |
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2010
- 2010-10-09 CN CN2010105009485A patent/CN102443714A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102806346A (en) * | 2012-07-16 | 2012-12-05 | 株洲同一实业有限公司 | Forming method for hard alloy anvil |
| CN103911536B (en) * | 2014-04-02 | 2016-03-16 | 成都工具研究所有限公司 | Containing Cr high-steel level oil gas thread sintered carbide tool material for processing |
| CN103911536A (en) * | 2014-04-02 | 2014-07-09 | 成都工具研究所有限公司 | Cr containing high-grade steel hard alloy cutter material for petroleum pipeline thread machining |
| CN104480334A (en) * | 2014-11-28 | 2015-04-01 | 江西稀有稀土金属钨业集团有限公司 | Preparation method of nanoscale hard alloy |
| CN104480336B (en) * | 2014-12-11 | 2016-10-26 | 陕西理工学院 | A kind of high-temperature-resistant high WC-Co-Ti3siC2the preparation method of Hardmetal materials |
| CN104480336A (en) * | 2014-12-11 | 2015-04-01 | 陕西理工学院 | Preparation method of high temperature-resistant high-strength WC-Co-Ti3SiC2 hard alloy material |
| CN106032555A (en) * | 2015-03-18 | 2016-10-19 | 中国科学院宁波材料技术与工程研究所 | Granular material and preparation method thereof |
| CN106032555B (en) * | 2015-03-18 | 2018-01-19 | 中国科学院宁波材料技术与工程研究所 | A kind of pellet and preparation method thereof |
| CN106271489A (en) * | 2016-08-29 | 2017-01-04 | 河源富马硬质合金股份有限公司 | A kind of carbide bit and manufacture method thereof |
| CN107447154A (en) * | 2017-07-06 | 2017-12-08 | 徐州市瑜擎工程机械有限公司 | A kind of mining instrument hard alloy and preparation method thereof |
| CN108117392A (en) * | 2017-12-04 | 2018-06-05 | 株洲夏普高新材料有限公司 | Corrosion resistant non-bond cemented carbide and preparation method thereof |
| CN108103344A (en) * | 2018-01-11 | 2018-06-01 | 湖南科技大学 | One kind (W, Mo2)C-Al2O3Composite granule and preparation method thereof |
| CN108103344B (en) * | 2018-01-11 | 2019-07-26 | 湖南科技大学 | One kind (W, Mo2)C-Al2O3Composite granule and preparation method thereof |
| CN111139389A (en) * | 2020-01-10 | 2020-05-12 | 株洲金剑硬质合金有限公司 | Preparation method of hard alloy cutter material for processing plates |
| CN114250396A (en) * | 2021-11-19 | 2022-03-29 | 成都美奢锐新材料有限公司 | Superfine low-cobalt hard alloy material for wood processing and preparation method thereof |
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Application publication date: 20120509 |