CN100469919C - Hard alloy material powder dispersing agent - Google Patents
Hard alloy material powder dispersing agent Download PDFInfo
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- CN100469919C CN100469919C CNB2007100353501A CN200710035350A CN100469919C CN 100469919 C CN100469919 C CN 100469919C CN B2007100353501 A CNB2007100353501 A CN B2007100353501A CN 200710035350 A CN200710035350 A CN 200710035350A CN 100469919 C CN100469919 C CN 100469919C
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Abstract
The invention provides a compound dispersant for evenly dispersing ultra-fine cemented carbides powders, consisting of Tween 60, stearic acid and lauryl trimethyl ammonium bromide, which respectively account for 0.01 to 0.2percent, 0.01 to 0.1percent and 0.01 to 0.05percent of the powder weight. The invention solves the problem of uneven structure of ultra-fine cemented carbides caused by unevenly spread powder.
Description
Technical field
The present invention relates to a kind of homodisperse dispersion agent of hard alloy material powder that makes, in particular for the homodisperse composite dispersion agent of superfine hard alloy raw material powder.
Background technology
When preparation ultra-fine cemented carbide compound, mechanical milling process is to make ultrafine WC powder, Co powder and grain growth inhibitor uniform distribution.Because the polycomponent powder size is thin, specific surface area is big, the surface energy height, and reactive behavior height, powder granule have mutual reunion, to reduce the trend of surface energy.This coacervate is heterogeneous, and in the starting stage of sintering densification, growing up rapidly of WC grain will be taken place in the zone of powder high Co or poor grain growth inhibitor in pressed compact; Along with the carrying out of densification, discontinuous growing up these zones of control so just produce thick WC grain and Co pond, waited uneven weave construction.
Summary of the invention
The purpose of this invention is to provide a kind of homodisperse composite dispersion agent of superfine hard alloy raw material powder that makes, solution causes the uneven problem of ultra-fine cemented carbide weave construction because of the raw material powder uneven distribution.
In order to achieve the above object, the composite dispersion agent that the present invention adopts is made up of polysorbate60, stearic acid and Trimethyllaurylammonium bromide, the amount of polysorbate60 be the material powder quality 0.01%～0.2%, stearic amount be the material powder quality 0.01%～0.1%, the amount of Trimethyllaurylammonium bromide is 0.01%～0.05% of material powder quality.
During the compound ball milling, add above-mentioned composite dispersion agent in slip, wherein anionic dispersing agent stearic acid and cationic dispersing agent Trimethyllaurylammonium bromide make static charge on the raw material powder particle surface band, make between the raw material powder particle to repel each other; The non-ionic dispersing agent polysorbate60 stops intergranular approaching mutually by surface adsorption.Two kinds of mechanism make each component homodisperse in slip in conjunction with producing Coulomb repulsion and space steric effect, make finally to obtain the uniform alloy of weave construction.
Description of drawings
Fig. 1 is the SEM picture that the embodiment of the invention 1 composite dispersion agent adds the ultra-fine cemented carbide of back preparation;
Fig. 2 is the SEM picture that the embodiment of the invention 2 composite dispersion agents add the ultra-fine cemented carbide of back preparation;
Fig. 3 is the SEM picture that the embodiment of the invention 3 composite dispersion agents add the ultra-fine cemented carbide of back preparation.
Fig. 4 is the SEM picture that does not add the ultra-fine cemented carbide of composite dispersion agent preparation of the present invention;
Embodiment
Embodiment 1: 9: 1 be configured to compound 1Kg less than 2.0 Co powder by mass ratio less than 0.4 WC powder and Fsss granularity with the BET granularity.Employing alcohol is wet grinding media, 2% forming agent PEG4000 (following examples all with), in mixed slurry, press the per kilogram compound and add 0.4g polysorbate60,0.2g stearic acid, 0.1g Trimethyllaurylammonium bromide, be respectively 0.04%, 0.02% and 0.01% of powder quality.Above-mentioned material carries out the wet-milling more than 48 hours, again drying, sieve, compression moulding and 1410 ℃ of low pressure sinterings, make ultra-fine cemented carbide.Fig. 1 is for to add the SEM picture that composite dispersion agent is made alloy by above-mentioned condition; Fig. 4 is not for adding the SEM picture that dispersion agent is made alloy.Table 1 has been listed and has not been added dispersion agent and make alloy and add the physicals that composite dispersion agent is made alloy by above-mentioned condition.
Embodiment 2: press the per kilogram compound and add 0.8g polysorbate60,0.3g stearic acid, 0.1g Trimethyllaurylammonium bromide in mixed slurry, be respectively 0.08%, 0.03% and 0.01% of powder quality.Above-mentioned material through same wet-milling, drying, sieve, compression moulding and low pressure sintering, make ultra-fine cemented carbide.Fig. 2 is for to add the SEM picture that composite dispersion agent is made alloy by above-mentioned condition.Table 1 has been listed by above-mentioned condition and has been added the physicals that composite dispersion agent is made alloy.
Embodiment 3: press the per kilogram compound and add 2.0g polysorbate60,1.0g stearic acid, 0.3g Trimethyllaurylammonium bromide in mixed slurry, be respectively 0.2%, 0.1% and 0.03% of powder quality.Above-mentioned material through same wet-milling, drying, sieve, compression moulding and low pressure sintering, make ultra-fine cemented carbide.Fig. 3 is for to add the SEM picture that composite dispersion agent is made alloy by above-mentioned condition.Table 1 has been listed by above-mentioned condition and has been added the physicals that composite dispersion agent is made alloy.
Table 1
| The numbering number | Density | Hardness | Intensity | Porosity | |
| 1 | Do not add dispersion agent | 14.47 | 1660 | 2500 | A02B00 |
| 2 | Add dispersion agent: embodiment 1 | 14.48 | 1660 | 2700 | A02B00 |
| 3 | Add dispersion agent: embodiment 2 | 14.48 | 1670 | 2750 | A02B00 |
| 4 | Add dispersion agent: embodiment 3 | 14.48 | 1670 | 2680 | A02B00 |
From Fig. 1～Fig. 4 and table 1 as can be seen, add the alloy of composite dispersion agent when the compound ball milling, weave construction is more even, bending strength high about 10%.
Claims (1)
1, a kind of composite dispersion agent of hard alloy raw material powder body, it is characterized in that: this composite dispersion agent is made up of polysorbate60, stearic acid and Trimethyllaurylammonium bromide, the amount of polysorbate60 be the material powder quality 0.01%～0.2%, stearic amount be the material powder quality 0.01%～0.1%, the amount of Trimethyllaurylammonium bromide is 0.01%～0.05% of material powder quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100353501A CN100469919C (en) | 2007-07-10 | 2007-07-10 | Hard alloy material powder dispersing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100353501A CN100469919C (en) | 2007-07-10 | 2007-07-10 | Hard alloy material powder dispersing agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101121973A CN101121973A (en) | 2008-02-13 |
| CN100469919C true CN100469919C (en) | 2009-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100353501A Active CN100469919C (en) | 2007-07-10 | 2007-07-10 | Hard alloy material powder dispersing agent |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365823B (en) * | 2018-10-25 | 2021-02-02 | 上海材料研究所 | Integral hard alloy hob and manufacturing process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425522A (en) * | 2002-10-30 | 2003-06-25 | 株洲硬质合金集团有限公司 | Method for preventing super fine hard alloy from oxidation in producing process |
| CN1597885A (en) * | 2004-07-23 | 2005-03-23 | 袁美和 | Coating for producing hard alloy |
| CN1804067A (en) * | 2006-01-17 | 2006-07-19 | 武汉理工大学 | Preparation process of tungsten carbide/inhibitor composite powder and superfine hard alloy thereof |
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2007
- 2007-07-10 CN CNB2007100353501A patent/CN100469919C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425522A (en) * | 2002-10-30 | 2003-06-25 | 株洲硬质合金集团有限公司 | Method for preventing super fine hard alloy from oxidation in producing process |
| CN1597885A (en) * | 2004-07-23 | 2005-03-23 | 袁美和 | Coating for producing hard alloy |
| CN1804067A (en) * | 2006-01-17 | 2006-07-19 | 武汉理工大学 | Preparation process of tungsten carbide/inhibitor composite powder and superfine hard alloy thereof |
Non-Patent Citations (2)
| Title |
|---|
| 硬质合金混合料制备新工艺特征分析. 张立等.中国有色金属学报，第15卷第2期. 2005 |
| 硬质合金混合料制备新工艺特征分析. 张立等.中国有色金属学报，第15卷第2期. 2005 * |
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| CN101121973A (en) | 2008-02-13 |
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