CN1216171C - Process for preparing ultra-fine cemented carbide - Google Patents
Process for preparing ultra-fine cemented carbide Download PDFInfo
- Publication number
- CN1216171C CN1216171C CN 200310110521 CN200310110521A CN1216171C CN 1216171 C CN1216171 C CN 1216171C CN 200310110521 CN200310110521 CN 200310110521 CN 200310110521 A CN200310110521 A CN 200310110521A CN 1216171 C CN1216171 C CN 1216171C
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- Prior art keywords
- powder
- sintering
- hard alloy
- super fine
- improved
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- 238000004519 manufacturing process Methods 0.000 title description 2
- 239000000843 powder Substances 0.000 claims abstract description 37
- 238000005245 sintering Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000000748 compression moulding Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 6
- 238000001238 wet grinding Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 239000003082 abrasive agent Substances 0.000 claims 1
- 239000004615 ingredient Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 229910003470 tongbaite Inorganic materials 0.000 abstract 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- 238000003754 machining Methods 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 238000000498 ball milling Methods 0.000 description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 241001074085 Scophthalmus aquosus Species 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 2
- 229910009043 WC-Co Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Powder Metallurgy (AREA)
Abstract
The present invention discloses a method for making a super fine hard alloy, which comprises the procedures of compounding material, wetly grinding the compounded material, pressing the obtained matter for forming, sintering the formed products, etc.; super fine WC powder whose Fisher particle size is from 0.3 to 0.7 mum, (5.5 to 7.0)wt% of Co powder, (0.2 to 0.5)wt% of VC powder and (0.2 to 0.8)wt% of Cr3C2 powder are adopted when material is compounded; sintering operation is carried out at the low pressure of 5 to 10MPas; an optimal proportion of the Cr3C2 to the VC is form 2.2 to 1.1. The super fine hard alloy obtained by the method of the present invention has the characteristics that the minimum mean grain size of the WC is equal to (0.2 to 0.4)mum; the hardness is improved to Hv<30>2000 to 2200 under the condition of the basic invariableness of bending strength (3000 to 3800 N/mm<2>); consequently, abrasion resistance is greatly improved; the service life of a prepared product is extended; the machining precision is improved.
Description
Technical field
The present invention relates to a kind of preparation method of Wimet, particularly the WC-Co ultrafine hard alloy preparation method.
Background technology
Wimet has purposes widely with its high rigidity and high strength.Domestic in the past generally is that Fisher particle size is that the WC powder of 0.8～1.0 μ m and weight percent are 6%～10% Co powder making the little brill of PCB and little material of milling employing, and to add weight percent be 0.5% inhibitor C r
3C
2, make through operations such as wet-milling, drying, compression moulding and vacuum sinterings; The Wimet hardness that makes with this method is lower, Hv
301550～1650, wear resistance is relatively poor.
Summary of the invention
The present invention is directed to the deficiency of above-mentioned preparation ultra-fine cemented carbide method, a kind of new preparation method is provided,, increase its wear resistance to improve the hardness of ultra-fine cemented carbide.
For achieving the above object, ultrafine hard alloy preparation method of the present invention comprises batching, wet-milling, drying, compression moulding and sintering circuit; The time selecting Fisher particle size for use in batching is that the ultrafine WC powder of 0.3～0.7 μ m and weight percent are 5.5～7.0% Co powder, 0.2～0.5%VC powder, 0.2～0.8%Cr
3C
2Powder; Sintering circuit adopts the low pressure sintering of 5～10MPa.
As a further improvement on the present invention, Cr
3C
2With the proportion scale of VC be Cr
3C
2: VC=2.2～1.1.
Since selected for use Fisher particle size be the ultrafine WC powder of 0.3～0.7 μ m as raw material, adopt proper C r simultaneously
3C
2With VC as grain inhibitor, by the low pressure sintering of 5～10MPa, make the mean grain size of WC in the ultra-fine cemented carbide of the present invention that finally obtains little, at the constant substantially (3000～3800N/mm of bending strength to 0.2～0.4 μ m
2) situation under, hardness is brought up to Hv
302000～2200, thus wear resistance is also improved greatly, and the little brill of the PCB of manufacturing and the prolongation in work-ing life of little milling cutter, working accuracy improve.And by further controlling Cr
3C
2With the proportion scale of VC, both can reach preferable inhibition grain growth effect, can improve its resistance of oxidation again, more help the use of the little brill of PCB and little milling cutter.
Embodiment
Embodiment 1: selecting weight percent during batching for use is 6.0% Co powder, 0.44% Cr
3C
2Powder, 0.2% VC powder (Cr
3C
2: VC=2.2), surplus is the WC powder, and its Fisher particle size is 0.7 μ m; As ball-milling medium, liquid-solid ratio is 500ml/Kg with alcohol, and ratio of grinding media to material is 4.5: 1, and the ball milling time is 82 hours, and the spray-dried compound that makes after the compression molding, places in the low pressure sintering stove and carries out sintering with 1380 ℃, and sintering pressure is 5MPa.With the bar of the Φ 3.25 * 38.5mm after the corase grind standard prod (following examples are identical) as the ultra-fine cemented carbide of check the inventive method preparation, its WC mean grain size is 0.40 μ m, and bending strength is 3800N/mm
2, hardness Hv
302000.
Embodiment 2: selecting weight percent during batching for use is 6.5% Co powder, 0.8% Cr
3C
2Powder, 0.5% VC powder (Cr
3C
2: VC=1.6)., surplus is the WC powder, its Fisher particle size is 0.7 μ m; As ball-milling medium, liquid-solid ratio is 500ml/Kg with alcohol, and ratio of grinding media to material is 5.2: 1, and the ball milling time is 87 hours, and the spray-dried compound that makes after the compression molding, places in the low pressure sintering stove and carries out sintering with 1410 ℃, and sintering pressure is 5MPa.The WC mean grain size of product is 0.25 μ m, and bending strength is 3000N/mm
2, hardness Hv
302200.
Embodiment 3: selecting weight percent during batching for use is 6.2% Co powder, 0.6% Cr
3C
2Powder, 0.4% VC powder (Cr
3C
2: VC=1.5), surplus is the WC powder, and its Fisher particle size is 0.34 μ m; As ball-milling medium, liquid-solid ratio is 500ml/Kg with alcohol, and ratio of grinding media to material is 4.8: 1, and the ball milling time is 80 hours, and the spray-dried compound that makes after the compression molding, places in the low pressure sintering stove and carries out sintering with 1400 ℃, and sintering pressure is 8MPa.The WC mean grain size of product is 0.30 μ m, and bending strength is 3400N/mm
2, hardness Hv
302150.
Embodiment 4: selecting weight percent during batching for use is 6.0% Co powder, 0.5% Cr
3C
2Powder, 0.45% VC powder (Cr
3C
2: VC=1.1)., surplus is the WC powder, its Fisher particle size is 0.51 μ m; As ball-milling medium, liquid-solid ratio is 500ml/Kg with alcohol, and ratio of grinding media to material is 5.0: 1, and the ball milling time is 90 hours, and the spray-dried compound that makes after the compression molding, places in the low pressure sintering stove and carries out sintering with 1400 ℃, and sintering pressure is 10MPa.The WC mean grain size of product is 0.35 μ m, and bending strength is 3500N/mm
2, hardness Hv
302110.
Embodiment 5: selecting weight percent during batching for use is 5.9% Co powder, 0.4% Cr
3C
2Powder, 0.3% VC powder (Cr
3C
2: VC=1.333)., surplus is the WC powder, its Fisher particle size is 0.43 μ m; As ball-milling medium, liquid-solid ratio is 500ml/Kg with alcohol, and ratio of grinding media to material is 5.5: 1, and the ball milling time is 90 hours, and the spray-dried compound that makes after the compression molding, places in the low pressure sintering stove and carries out sintering with 1380 ℃, and sintering pressure is 10MPa.The WC mean grain size of product is 0.35 μ m, and bending strength is 3600N/mm
2, hardness Hv
302050.
Claims (2)
1, a kind of ultrafine hard alloy preparation method, comprise batching, wet-milling, drying, compression moulding and sintering circuit, the ratio of grinding media to material of wet-milling is 4.5～5.5: 1, liquid-solid ratio is 500ml/Kg, the abrasive material time is 80～90h, 1380～1410 ℃ of sintering temperatures is characterized in that: ingredients by weight per-cent is 5.5～7.0% Co powder, 0.2～0.5%VC powder, 0.2～0.8%Cr
3C
2Powder, surplus are the ultrafine WC powder of Fisher particle size 0.3～0.7 μ m, and it is the low pressure sintering of 5～10MPa that sintering adopts pressure.
2, ultrafine hard alloy preparation method as claimed in claim 1 is characterized in that: Cr
3C
2The proportion scale of powder and VC powder is Cr
3C
2: VC=2.2～1.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110521 CN1216171C (en) | 2003-11-17 | 2003-11-17 | Process for preparing ultra-fine cemented carbide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110521 CN1216171C (en) | 2003-11-17 | 2003-11-17 | Process for preparing ultra-fine cemented carbide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1544675A CN1544675A (en) | 2004-11-10 |
| CN1216171C true CN1216171C (en) | 2005-08-24 |
Family
ID=34335642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310110521 Expired - Lifetime CN1216171C (en) | 2003-11-17 | 2003-11-17 | Process for preparing ultra-fine cemented carbide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1216171C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI494444B (en) * | 2011-12-14 | 2015-08-01 |
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| CN100387737C (en) * | 2005-11-21 | 2008-05-14 | 株洲硬质合金集团有限公司 | Method for preparing super fine hard alloy |
| CN100439011C (en) * | 2006-01-20 | 2008-12-03 | 华南理工大学 | Tungsten carbide base hard alloy powder metallurgical material and its preparation method |
| CN101629263B (en) * | 2009-08-06 | 2011-11-02 | 江西稀有稀土金属钨业集团有限公司 | Ultrafine cemented carbide and preparation method and application thereof |
| US8173561B2 (en) * | 2009-11-10 | 2012-05-08 | Kennametal Inc. | Inert high hardness material for tool lens production in imaging applications |
| CN101812621A (en) * | 2010-04-22 | 2010-08-25 | 株洲硬质合金集团有限公司 | Submicron hard alloy and preparation method |
| CN101824575B (en) * | 2010-05-27 | 2011-09-07 | 中南大学 | Ultrafine grain wolfram carbide/ cobalt hard alloy and preparation method thereof |
| CN102728710A (en) * | 2012-07-06 | 2012-10-17 | 济南市冶金科学研究所 | Hard alloy plunger chip |
| CN102896319B (en) * | 2012-10-27 | 2015-01-28 | 株洲美特优硬质合金有限公司 | Manufacture method for micropore wiredrawing die and manufacture mould |
| CN103042257A (en) * | 2013-01-17 | 2013-04-17 | 河南省大地合金股份有限公司 | Micro drill for printed circuit board (PCB) and preparation method thereof |
| CN103045887B (en) * | 2013-01-17 | 2015-05-06 | 中南大学 | Fine pure plate-shaped grain cemented carbide and preparation method thereof |
| CN103614603A (en) * | 2013-12-09 | 2014-03-05 | 株洲硬质合金集团有限公司 | Hard alloy with grain size of less than 200nm and preparation method thereof |
| CN104308230B (en) * | 2014-09-18 | 2017-05-03 | 宁波市荣科迈特数控刀具有限公司 | Side fixed type shovel drill |
| 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 |
| CN104439233B (en) * | 2014-12-15 | 2016-09-21 | 技锋精密刀具（马鞍山）有限公司 | A kind of material of hard alloy cutting tool |
| CN104831101A (en) * | 2015-05-25 | 2015-08-12 | 江西稀有稀土金属钨业集团有限公司 | Preparation method and system of hard alloy material |
| CN105296834B (en) * | 2015-11-04 | 2017-05-17 | 北京有色金属研究总院 | High-hardness and high-tenacity hard alloy and preparation method thereof |
| CN109161772B (en) * | 2018-09-10 | 2019-11-19 | 晋城鸿刃科技有限公司 | The preparation method of ultra-fine cemented carbide |
| CN112877578A (en) * | 2019-11-29 | 2021-06-01 | 株洲钻石切削刀具股份有限公司 | Ultra-fine grain hard alloy and preparation method thereof |
| CN111088445B (en) * | 2019-12-31 | 2022-04-01 | 株洲硬质合金集团有限公司 | Hard alloy and preparation method and application thereof |
| CN113201677A (en) * | 2021-05-07 | 2021-08-03 | 四川坤天硬质合金有限责任公司 | Production process for producing ultrafine grain hard alloy by using sub-fine tungsten carbide |
| CN115896519A (en) * | 2022-11-16 | 2023-04-04 | 河南大地合金有限公司 | Method for preparing hard alloy from WC ultrafine powder and hard alloy |
-
2003
- 2003-11-17 CN CN 200310110521 patent/CN1216171C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI494444B (en) * | 2011-12-14 | 2015-08-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1544675A (en) | 2004-11-10 |
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