CN1207121C - Method for preventing super fine hard alloy from oxidation in producing process - Google Patents
Method for preventing super fine hard alloy from oxidation in producing process Download PDFInfo
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- CN1207121C CN1207121C CN02139710.4A CN02139710A CN1207121C CN 1207121 C CN1207121 C CN 1207121C CN 02139710 A CN02139710 A CN 02139710A CN 1207121 C CN1207121 C CN 1207121C
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- oxidation
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- hard alloy
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Abstract
The present invention discloses a method for preventing oxidation in the preparation process of ultrafine hard alloys. In the method, Tween 60 is added to wet grinding media, and the adding quantity of the Tween 60 is from 3 to 12 ml in per kilogram of mixed materials. The method can shorten the oxidizing time of raw material powder and prevent the oxidation of the mixed materials, and the oxygen content in the mixed materials can be decreased to be 0.65 to 0.73% from the previous ratio of 1.00 to 1.30% of the present invention by weight percentage. Therefore, the porosity of the ultrafine hard alloys can be decreased, and the bending resisting strength is increased.
Description
Technical field
The present invention relates to a kind of method that prevents oxidation in the ultra-fine cemented carbide preparation process.
Background technology
Ultra-fine cemented carbide is widely used in difficult-to-machine material field, microelectronics industry and precision die processing industry because of having higher bending strength and hardness simultaneously.The preparation of ultra-fine cemented carbide generally adopts the tungsten carbide powder of (0.2～0.28) μ m and the cobalt powder of (0.70～0.95) μ m to make raw material, because raw material powder has huge surface energy, very easily oxidation, and the powder of oxidation densification degree when sintering reduces, porosity increases, in the brittle decarburization phase of the inner easily generation of Wimet, the intensity of alloy is significantly reduced simultaneously, have a strong impact on the use properties of superfine alloy.
Summary of the invention
The purpose of this invention is to provide a kind of method that prevents oxidation in the ultra-fine cemented carbide preparation process, solve the problem that the ultra-fine cemented carbide bending strength is reduced because of the raw material powder oxidation.
In order to achieve the above object, technical scheme of the present invention is: being wet grinding media with acetone, is compound with tungsten carbide powder and cobalt powder, adds polysorbate60 in wet grinding media, and its add-on is to add (3～12) ml in every kilogram of compound.
Because polysorbate60 is added wet grinding media, can reduce the viscosity of slip, the ball milling mixing time of ultra-fine feed stock powder was shortened more than 24 hours, thereby shortened oxidization time, prevent the compound oxidation.Oxygen level can be reduced to (0.65～0.73) % from (1.00～1.30) % (weight percent) before the present invention in the compound.
As a further improvement on the present invention, can adopt acetone to make wet grinding media.Because acetone is than other wet grinding media, as alcohol, water content is low, so oxygen level reduces in the compound, can further prevent the raw material powder oxidation effectively.
Embodiment
Be mixed with compound by weight 9: 1 with the tungsten carbide powder of nitrogen absorption granularity 0.21 μ m and the cobalt powder of Fisher particle size 0.85 μ m, add 360ml acetone by every kilogram of compound again, dry down through ball milling 72 hours and 160 ℃, table 1 listed by above-mentioned technical qualification preparation not adding polysorbate60 and add the different content polysorbate60 compound and through ball milling and dry after oxygen level.
Table 2 listed corresponding with table 14 kinds through ball milling and the exsiccant compound physicals through mixing forming agent, compression moulding, taking off the ultra-fine cemented carbide that forming agent and 1380 ℃ of vacuum sintering made in 60 minutes again.As seen from Table 2, the porosity of the ultra-fine cemented carbide that employing the inventive method is made descends, and bending strength obviously improves.
Table 1
| Numbering | Tween dosage (ml/kg compound) | Oxygen level (weight percent) |
| 1 | 0 | 1.04 |
| 2 | 3 | 0.70 |
| 3 | 8 | 0.72 |
| 4 | 12 | 0.67 |
Table 2
| Numbering | Density (g/cm 3) | Hardness (HRA) | Porosity | Bending strength (N/mm 2) |
| 1 | 14.43 | 93.1 | A04B00 | 2578 |
| 2 | 14.44 | 93.1 | A02B00 | 2805 |
| 3 | 14.45 | 93.1 | A02B00 | 2930 |
| 4 | 14.45 | 93.1 | A02B00 | 3100 |
Claims (1)
1, a kind of method that prevents oxidation in the ultra-fine cemented carbide preparation process is characterized in that: being wet grinding media with acetone, is compound with tungsten carbide powder and cobalt powder, adds polysorbate60 in wet grinding media, and its add-on is to add 3～12ml in every kilogram of compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02139710.4A CN1207121C (en) | 2002-10-30 | 2002-10-30 | Method for preventing super fine hard alloy from oxidation in producing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02139710.4A CN1207121C (en) | 2002-10-30 | 2002-10-30 | Method for preventing super fine hard alloy from oxidation in producing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1425522A CN1425522A (en) | 2003-06-25 |
| CN1207121C true CN1207121C (en) | 2005-06-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02139710.4A Expired - Fee Related CN1207121C (en) | 2002-10-30 | 2002-10-30 | Method for preventing super fine hard alloy from oxidation in producing process |
Country Status (1)
| Country | Link |
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| CN (1) | CN1207121C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427245C (en) * | 2006-08-28 | 2008-10-22 | 苏州江钻新锐硬质合金有限公司 | Control method of powder oxygen content in manufacturing process of ultrafine hard alloy |
| CN100469919C (en) * | 2007-07-10 | 2009-03-18 | 株洲钻石切削刀具股份有限公司 | Hard alloy material powder dispersing agent |
| CN109365823B (en) * | 2018-10-25 | 2021-02-02 | 上海材料研究所 | Integral hard alloy hob and manufacturing process thereof |
-
2002
- 2002-10-30 CN CN02139710.4A patent/CN1207121C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1425522A (en) | 2003-06-25 |
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Granted publication date: 20050622 Termination date: 20211030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |