CN103060055A - Special powder metallurgy lubricant for stainless steel and preparation method thereof - Google Patents
Special powder metallurgy lubricant for stainless steel and preparation method thereof Download PDFInfo
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- CN103060055A CN103060055A CN2013100244336A CN201310024433A CN103060055A CN 103060055 A CN103060055 A CN 103060055A CN 2013100244336 A CN2013100244336 A CN 2013100244336A CN 201310024433 A CN201310024433 A CN 201310024433A CN 103060055 A CN103060055 A CN 103060055A
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Abstract
The invention relates to a special powder metallurgy lubricant for a stainless steel and a preparation method thereof, and belongs to the technical field of additives for powder metallurgy materials. According to the special powder metallurgy lubricant for the stainless steel and the preparation method thereof, provided by the invention, a stearate, a vinyl-based distearic amide and an oleamide are adopted as the raw materials, the raw materials are uniformly mixed and heated to reach a certain temperature, and then the mixture is cooled, grinded, crushed and screened, thus obtaining the finished product of the special powder metallurgy lubricant for the stainless steel. The special powder metallurgy lubricant for the stainless steel, provided by the invention, is suitable for being used for pressing powders of stainless steels 304 and 316; and the special powder metallurgy lubricant is low in capacity of pressing and demoulding, low in production cost and high in production efficiency, and can ensure the safety of a mould in use.
Description
Technical field
The present invention relates to mmaterial additive technology field, particularly relate to metallurgical lubricant of a kind of stainless steel special powder and preparation method thereof.
Background technology
The lubricant that uses on the present domestic powder metallurgy market mainly contains the lubricant of micro mist wax (Acrawax), Zinic stearas, lithium stearate and some complex class, for example product of He Genasi Kenolube P11.But these lubricants all exist problem more or less, major embodiment in the following areas:
Micro mist wax series products in use volatile performance is relatively good, but the flow velocity of product and suppression performance aspect are undesirable to the improvement of sintered metal product, sometimes also can reduce the flowing property of powder, causes the filling of mixed powder unstable.
Zinic stearas and lithium stearate are the lubricants of commonly using, but because the reason of the chemical property of product own, can cause the residual a large amount of carbon in product sintering rear surface, sintering zinc oxide later also can cause the pollution of sintering oven, and is larger on the green strength impact of product.
Although import the advantage of He Genasi Kenolube P11 over-all properties apparent in view, but the dress powder height that just is confined to some product is high, for the large product of size, or can affect product stripping, and Kenolube P11 contains metallic zinc, so still can have some surperficial carbon distributions in the process of sintering, can produce stove simultaneously and pollute.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, proposes a kind of compounded lubricant and solves the problem that existing lubricant exists, the metallurgical lubricant of the stainless steel special powder that this invention proposes, the compacting knockout press is low, production cost is low, and production efficiency is high, can guarantee the safe handling of mould simultaneously.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The metallurgical lubricant of a kind of stainless steel special powder is comprised of the starting material of following weight percent:
Stearate 10%～40%,
Amine hydroxybenzene 10%～40%,
Vinyl bis-stearamides 40%～70%.
Preferably, the weight percent of described stearate is 20%.
Further, described stearate is lithium stearate.
Preferably, the weight percent of described amine hydroxybenzene is 20%; The weight percent of described vinyl bis-stearamides is 60%.
Preferably, its granularity is≤200 orders.
The preparation method of the metallurgical lubricant of a kind of stainless steel special powder, concrete steps are: described starting material in 20 ℃～25 ℃ lower mixing of normal temperature, are heated to temperature T
1Be 150 ℃～170 ℃, behind thermostatically heating 20min～40min, described mixture of raw material be cooled to temperature T
2Be 20 ℃～30 ℃, grind, pulverize and sieve, namely get the metallurgical lubricant finished product of described stainless steel special powder.
The invention has the beneficial effects as follows:
1, production technique of the present invention is simple, and is easy to operate, is beneficial to heavy industrialization;
2, excellent through the metallurgical flow velocity of the mixed powder behind the lubricant of the present invention, can guarantee flow velocity and the filling of powder;
3, excellent volatility, temperature≤500 ℃ can be volatilized fully, and residual ash content is few;
4, the compacting knockout press is low, reduces production costs low, greatly enhances productivity, and guarantees the safe handling of mould.
Embodiment
Example of the present invention is can not limit the present invention to explanation of the present invention, in the implication suitable with the present invention and any change and the adjustment in the scope, all should think within the scope of the invention.
The present invention will be further described below in conjunction with embodiment.
Embodiment 1
The preparation method of the metallurgical lubricant of a kind of stainless steel special powder, concrete operation step is: starting material stearate, amine hydroxybenzene and vinyl bis-stearamides in 20 ℃～25 ℃ lower mixing of normal temperature, are heated to temperature T
1Be 150 ℃～170 ℃, behind thermostatically heating 20min～40min, treat that starting material mix, the mixture of raw material that mixes is cooled to temperature T
2Be 20 ℃～30 ℃, grind, pulverize and sieve, namely get the metallurgical lubricant finished product of stainless steel special powder.
The mass percent of stearate is 10%～40%, and the weight percent of amine hydroxybenzene is 10%～40%, and the weight percent of described vinyl bis-stearamides is 40%～70%.
Stearate lubricant commonly used has Zinic stearas, Magnesium Stearate, barium stearate, sodium stearate, calcium stearate, aluminum stearate, 12-hydroxy lithium stearate and lithium stearate, thereby because Zinic stearas can residually have zinc oxide that stove is polluted in production technique; Calcium stearate has the deficiency of water absorbability and other aspect of performances; It is unstable for Magnesium Stearate, can affect the stability of product.The preferred lithium stearate of stearate among the present invention, the weight percent of preferred lithium stearate is 10% in the present embodiment.
The vinyl bis-stearamides also claims ethylene bis stearamide (EBS), is one of powder metallurgy lubricant commonly used.This compound is hard and crisp white high melting-point wax, its industrial goods are for being slightly yellowy fine particle, nontoxic, human body is had no side effect, be insoluble to most of solvents under the normal temperature, stable to soda acid and water medium, can be dissolved in hot chlorinated hydrocarbons and aromatic hydrocarbon solvent, its meal soapy feeling is stronger, more than 80 ℃ glassware for drinking water is had wetting properties.The weight percent of vinyl bis-stearamides is 50% in the present embodiment.
Amine hydroxybenzene, claim again oleylamide or (Z)-9-octadecenic acid acid amides, it is a kind of inside and outside lubricated all than more excellent powder, can make the demoulding easy as the releasing agent of polyolefine injection moulding, thereby increase output, improve the surface luster of goods, the weight percent of preferred amine hydroxybenzene is 40% in the present embodiment.
Wherein mixture of raw material is cooled to temperature T
2When being 20 ℃～30 ℃, mixture is carried out slicing treatment, then grind and be ground into fine powder, sieve by high frequency shale shaker again, order number wherein selects the metallurgical lubricant granularity of the stainless steel special powder after the screening to be≤200 orders, and what draw at last is the metallurgical lubricant finished product of stainless steel special powder.
The KH-1 type high-frequency vibration screening filter that high frequency shale shaker selects Shanghai Kai He Electromechanical Technology Co., Ltd to produce, selection standard order number is 200 purpose reciprocating sieves during screening, wherein the order number refers to the mesh count that has on screen cloth per inch (25.4mm) length, size of mesh: 0.0750mm.
Embodiment 2
Identical with embodiment 1, difference is:
The weight percent of lithium stearate is 20%, and the weight percent of amine hydroxybenzene is 20%, and the weight percent of vinyl bis-stearamides is 60%.
Embodiment 3
Identical with embodiment 1, difference is:
The weight percent of lithium stearate is 40%, and the weight percent of amine hydroxybenzene is 10%, and the weight percent of vinyl bis-stearamides is 50%.
Embodiment 4
Identical with embodiment 1, difference is:
The weight percent of lithium stearate is 40%, and the weight percent of amine hydroxybenzene is 20%, and the weight percent of vinyl bis-stearamides is 40%.
Embodiment 5
Identical with embodiment 1, difference is:
The weight percent of lithium stearate is 15%, and the weight percent of amine hydroxybenzene is 15%, and the weight percent of vinyl bis-stearamides is 70%.
Embodiment 6
Powder behind the interpolation embodiment 1～5 is done following performance test:
Flow of powder speed: the flow of powder velocity measuring device is selected TBX-50, and TBX-50 is applicable to Free-flow and crosses the powder that the aperture is the 5.0mm standard funnel, all flowability of available this apparatus measures powder.Concrete method of calculation represent flow of powder speed for spending the needed time of standard funnel with the 50g flow of powder, and wherein powder refers to add respectively the powder behind the lubricant of embodiment 1～5 preparation.
Loose density: loose density is to characterize the important parameter that powder particle pine dress is piled up, and it refers to the powder density that powder records during natural filling container under prescribed condition, and unit is g/cm3.The measuring method of apparent density of powder has 3 kinds: funnel method, Scott volumeter method, Vibrating funnel method.
(1) funnel method: powder freely falls by certain altitude from funnel hole and is full of cup;
(2) Scott volumeter method: be that powder is put on the screen cloth of top combination funnel, free or outer power flows into the cloth hopper, alternately be 25 ° sheet glass and square-shaped hopper through 4 pitch angle in the cloth hopper, freely fall by certain altitude from funnel hole at last and be full of cup;
(3) Vibrating funnel method: be that powder is packed in the funnel with vibrating device, vibrate under certain condition, powder is by means of vibration, freely falls by certain altitude from funnel hole to be full of cup.
Wherein powder refers to add respectively the powder behind the lubricant of embodiment 1～5 preparation, and table 1 is for adding respectively the powder property test chart behind the embodiment 1～5, and is as shown in table 1.
Table 1
As can be seen from Table 1, the velocity of flow of embodiment 2 is faster than the velocity of flow of other embodiment under the same terms, and the loose density of embodiment 2, knockout press and green strength are best.Therefore embodiment 2 be most preferred embodiment, and the weight percent of lithium stearate is 20% among the embodiment 2, and the weight percent of amine hydroxybenzene is 20%, and the weight percent of vinyl bis-stearamides is 60% to be best raw material ratio.
Comparative Examples 1
Performance and micro mist wax, lithium stearate to the metallurgical lubricant of resulting stainless steel special powder among the embodiment 2 compare, select raw material: iron powder ASC100.2950Kg, lubricant addition 0.8%, wherein lubricant addition per-cent is the amounts of lubrication take iron powder as benchmark, adds the lubricant kind: embodiment 2, micro mist wax, lithium stearate; Its concrete operation step is for taking by weighing at first first the iron powder of the ASC100.29 of 10Kg, after lubricant to be tested, graphite mix 10 minutes, the iron powder that adds again remaining 40Kg ASC100.29, mix after 20 minutes, the mixed powder that obtains is carried out experiment of pressing, on the experiment press of 100T, pressed density is to 7.0g/cm
3, the sample length and width of experiment are high: the standard cylinder that is respectively 30mm * 13mm * 7mm.Table 2 is the performance test after iron powder ASC100.29 adds respectively lubricant to be tested, and is as shown in table 2.
Table 2
| Performance test | The lubricant addition | Embodiment 2 | Micro mist wax | Lithium stearate |
| Velocity of flow (s) | 0.8% | 26.3 | 34.4 | 27.7 |
| Loose density (g/cm 3） | 0.8% | 3.19 | 3.23 | 3.34 |
| Knockout press (KN) | 0.8% | 28 | 60.4 | 46.5 |
| Green strength (Mpa) | 0.8% | 14.32 | 15.45 | 11.45 |
As can be seen from Table 2, the velocity of flow that iron powder ASC100.29 interpolation embodiment 2 makes behind the metallurgical lubricant of stainless steel special powder can improve 8.1 seconds than micro mist wax, improved nearly 1.4 seconds than lithium stearate, three products in loose density aspect that iron powder ASC100.29 adds behind above-mentioned three kinds of lubricants are more or less the same.The knockout press that embodiment 2 makes the metallurgical lubricant of stainless steel special powder can reduce by 43% than micro mist wax, and lower by 30.8% than lithium stearate, its green strength is higher by 25% than lithium stearate.
Comparative Examples 2
Performance and micro mist wax, lithium stearate to the metallurgical lubricant of resulting stainless steel special powder among the embodiment 2 compare, select raw material: iron powder Kobelco300MA50Kg, copper powder 2%, graphite 0.8%, lubricant addition 0.8%, wherein copper powder, graphite and lubricant addition per-cent are the amounts of lubrication take iron powder as benchmark, add the lubricant kind: embodiment 2, micro mist wax, lithium stearate; Its concrete operation step is: the iron powder that takes by weighing at first first the Kobelco300MA of 10Kg, with lubricant 0.8% to be tested, graphite 0.8%, copper powder 2% mixed after 10 minutes, added remaining 40Kg Kobelco300MA iron powder again, mixed after 20 minutes, the mixed powder that obtains is carried out experiment of pressing, on the experiment press of 100T, pressed density is to 7.0g/cm3, and the sample length and width of experiment are high: the standard cylinder that is respectively 30mm*13mm*7mm.Table 3 is the performance test after iron powder Kobelco300MA adds respectively lubricant to be tested, and is as shown in table 3.
Table 3
| Performance test | The lubricant addition | Embodiment 2 | Micro mist wax | Lithium stearate |
| Velocity of flow (s) | 0.8% | 28.2 | 31.4s | 35.8 |
| Loose density (g/cm 3） | 0.8% | 3.22 | 3.06 | 3.32 |
| Knockout press (KN) | 0.8% | 26.8 | 30.2 | 29.3 |
| Green strength (Mpa) | 0.8% | 10.72 | 12.11 | 8.82 |
As can be seen from Table 3, after having added powdered alloy copper powder and graphite, iron powder Kobelco300MA adds embodiment 2 and makes velocity of flow behind the metallurgical lubricant of stainless steel special powder than micro mist wax fast 3.2 seconds, than lithium stearate fast 7.6 seconds, the loose density that iron powder Kobelco300MA adds behind the above-mentioned lubricant is more or less the same, the knockout press that iron powder Kobelco300MA interpolation embodiment 2 makes behind the metallurgical lubricant of stainless steel special powder reduces by 12.7% than micro mist wax knockout press, lower by 12.2% than lithium stearate, its green strength improves 21.5% than lithium stearate.
The metallurgical lubricant of the stainless steel special powder that the present invention proposes, it is specially for the stainless powder development and production of powder metallurgy, is suitable for the compacting of stainless steel 304,316 powder.It can increase substantially the compressibility of stainless steel product, improves the demolding performace of product.Its use properties is far above in the market employed micro mist wax and lithium stearate.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the metallurgical lubricant of a stainless steel special powder is characterized in that, is comprised of the starting material of following weight percent:
Stearate 10%～40%,
Amine hydroxybenzene 10%～40%,
Vinyl bis-stearamides 40%～70%.
2. the metallurgical lubricant of stainless steel special powder as claimed in claim 1, it is characterized in that: the weight percent of described stearate is 20%.
3. the metallurgical lubricant of stainless steel special powder as claimed in claim 2, it is characterized in that: described stearate is lithium stearate.
4. the metallurgical lubricant of stainless steel special powder as claimed in claim 1, it is characterized in that: the weight percent of described amine hydroxybenzene is 20%.
5. the metallurgical lubricant of stainless steel special powder as claimed in claim 1, it is characterized in that: the weight percent of described vinyl bis-stearamides is 60%.
6. the metallurgical lubricant of stainless steel special powder as claimed in claim 1, it is characterized in that: granularity is≤200 orders.
7. the preparation method such as the metallurgical lubricant of each described stainless steel special powder of claim 1～6 is characterized in that, concrete steps are: described starting material in 20 ℃～25 ℃ lower mixing of normal temperature, are heated to temperature T
1Be 150 ℃～170 ℃, behind thermostatically heating 20min～40min, described mixture of raw material be cooled to temperature T
2Be 20 ℃～30 ℃, grind, pulverize and sieve, namely get the metallurgical lubricant finished product of described stainless steel special powder.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104371804A (en) * | 2014-10-23 | 2015-02-25 | 苏州莱特复合材料有限公司 | Powder metallurgy lubricant and preparation method thereof |
| CN104388154A (en) * | 2014-10-24 | 2015-03-04 | 苏州莱特复合材料有限公司 | Powder metallurgy lubricant and preparation method thereof for stainless steel |
| CN109266421A (en) * | 2018-09-12 | 2019-01-25 | 天津百世康科技发展有限公司 | Powder used in metallurgy low temperature lubricant |
| CN110982584A (en) * | 2019-12-19 | 2020-04-10 | 广州庆帆翔材料科技有限公司 | Nano-scale lubricant and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104371804A (en) * | 2014-10-23 | 2015-02-25 | 苏州莱特复合材料有限公司 | Powder metallurgy lubricant and preparation method thereof |
| CN104388154A (en) * | 2014-10-24 | 2015-03-04 | 苏州莱特复合材料有限公司 | Powder metallurgy lubricant and preparation method thereof for stainless steel |
| CN109266421A (en) * | 2018-09-12 | 2019-01-25 | 天津百世康科技发展有限公司 | Powder used in metallurgy low temperature lubricant |
| CN110982584A (en) * | 2019-12-19 | 2020-04-10 | 广州庆帆翔材料科技有限公司 | Nano-scale lubricant and preparation method thereof |
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Application publication date: 20130424 |