CN1074841A - The manufacture method of compacted articles of aluminium powder - Google Patents
The manufacture method of compacted articles of aluminium powder Download PDFInfo
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- CN1074841A CN1074841A CN 92100719 CN92100719A CN1074841A CN 1074841 A CN1074841 A CN 1074841A CN 92100719 CN92100719 CN 92100719 CN 92100719 A CN92100719 A CN 92100719A CN 1074841 A CN1074841 A CN 1074841A
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- aluminium powder
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Abstract
Make the method for aluminium powder rolled-up stock.Before nitrogenize, fluoridize earlier, make the passivity oxide compound coating layer on the aluminium powder grain change fluoride layer into, and by the protection particle surface.Even be separated by the long period to nitridation process from forming fluoride layer, fluoride layer also can protect and keep the aluminium powder surface to be in good condition, prevents that particle surface from forming oxide skin again.Next step nitridation process decomposes fluoride layer and removes, and exposes the activatory surface, and the N atom evenly and in depth is dispersed in the aluminium upper layer when nitrogenize, forms thick and uniform hard nitride layer at the aluminium upper layer.Made rolled-up stock tool exceptional strength and tenacity.
Description
The present invention relates to manufacture method with the goods of aluminium powder compacting.
In recent years, utilize the aluminium powder rolled-up stock of heating isopressing method manufacturing to be used as the part of automobile chassis and so on to improve its performance, such as intensity and tenacity.Described heating isopressing method is to utilize H.I.P. device 20 as schematically shown in Figure 3 to carry out.The thin metal vessel 26 of want shape (for example, the parts such as chassis of automobile) is placed among the stove 21.The aluminium powder 11 that will be mixed with titanium valve, magnesium powder or the like with vacuum mode is encased among 26.Apply 100MPa or bigger pressure by means of injecting inert gas (as argon etc.) to this metal vessel, simultaneously its temperature is utilized well heater 25 to be raised to be higher than 1000 ℃, make the aluminium powder 11 within the container 26 be pressed into the shape identical, thereby obtain this Al-alloy products with this container.22 and 23 upper and lower covers that are respectively stove among the figure.
The aluminium powder 11 that is mixed with various metal-powders is before being encased in metal vessel 26 with vacuum mode, and the oxide skin that forms on need the surface with aluminium powder 11 is removed.Because this will be mixed with aluminium powder 11 heating of different powder.If with aluminium powder 11 mutually the blended powder be low-melting, then this low melting point powder will melt when above-mentioned heating, and the material after the fusing is just attached on the aluminium powder 11, so become the hamper when removing above-mentioned oxide skin.The problem that is caused is that intensity by the Al-alloy products of above-mentioned H.I.P device 20 gained is low like this, tenacity and other character is bad.
Therefore, the purpose of this invention is to provide a kind of method of making aluminium powder compacting product, make gained Al-alloy products tool good intensity and tenacity.
For achieving the above object, method by manufacturing aluminium powder compacting product of the present invention comprises such step: (1) contacts aluminium powder particle with fluorine-containing or fluoride gas under heating condition, (2) make through the fluorizated aluminium powder particle and under heating condition, contact with nitriding gas, make the surface of aluminium powder particle form hard nitride layer, (3) aluminium powder form of this via nitride is directly suppressed, obtained pressed ware.
In the method for manufacturing compacted articles of aluminium powder of the present invention, aluminium powder is before carrying out pressing process, contact at the gas of heated condition with fluorine-containing or fluoride, make the aluminium powder surface form fluoride layer, this aluminium powder is contacted with nitriding gas under heating condition, become hard nitride layer to remove this fluoride layer, to make the part of having removed (upper layer of this aluminum particle).In manufacture method of the present invention, owing to the aluminum particle surface was cleaned and activated through fluoridizing, can form even and deep nitride layer before nitrogenize, this nitride layer is very hard, and the excellent resistance to fatigue of tool, and thickness is big and even.Like this, do not form oxide skin on the aluminum particle surface of suppressing, and form hard nitride layer.Owing to this reason, the compacting product that makes at last is being very superior aspect the intensity particularly such as tenacity.
Used in the present invention fluorine-containing or fluoride gas is a kind of rare gas element, N for example, and contain at least a of following various fluorine source: such as NF
3, BF
3, CF
4, HF, SF
6, F
2Consider from reactivity, easy handling and other character, wherein with NF
3For preferably.
As previously mentioned, in the method for the invention, aluminium powder (independent or with the mixture of the powder of other metals such as titanium, magnesium) (for example, is being used NF under heating condition
3The time, 250-400 ℃) contact with above-mentioned gas fluorine-containing or fluoride, make the aluminum particle surface fluorination, carry out nitrogenize (or nitrogenize carbonization) with known nitriding gas such as ammonia then.In described fluorine-containing or fluoride gas, this fluorine source components contents for example is 1000-100000ppm, preferred 20000-70000ppm, preferably 30000-50000ppm.Can select the duration of contact of aluminium powder and fluorine-containing or fluoride gas according to following situation: the kind of aluminium powder, and the powder of being sneaked into, Heating temperature or the like, generally speaking, the time is several minutes.
With reference to Fig. 1, aluminium powder is sent into the gas treatment chamber of being located among the heat treatment furnace 19, make it to contact with fluorine-containing or fluoride gas.Process furnace 1 is a kind of pit furnace, comprises shell 2, establishes well heater 3 in it, and inner jar 4 is set within well heater 3.Vent pipe 6 is passed within the inner jar 4 outside stove 1, and airway 5 is sent into wherein by inner jar 4 and from the bottom of gas treatment chamber 9, and powder dispatch tube 8 feeds wherein via the top of inner jar 4 by gas treatment chamber 9.Gas comes out from steel cylinder 15,16, and through under meter 17, valve 18 is sent into airway 5.13 is vacuum pump, and 14 is the objectionable impurities eliminator.
The inside of gas treatment chamber 9 is heated to predetermined temperature of reaction, and with fluorine-containing or fluoride gas, for example NF
3With N
2Mixed gas inject by the gas inlet 5a that is positioned at gas duct 5 ends.Simultaneously, the open and close valve (not shown) of being located on the powder tank 7 is opened, made the aluminium powder form 11 that exists in the jar 7 enter dust outlet pipe 8, thereby make aluminium powder form fall into gas treatment chamber 9 by the dust outlet 8a of outlet pipe 8 ends.Above-mentioned NF
3Produce active fluorine at 250-400 ℃, these fluorine hit the particle of aluminium powder form 11, remove the inorganic and organic pollutant on the particle surface, simultaneously with the oxide compound on aluminium powder particle surface, as Al
2O
3, Al(OH)
3React (as shown in the formula represented), at particle surface formation fluoride layer AlF as thin as a wafer
3
These reactions are removed the oxide skin of the particle surface of aluminium powder form 11, and remove the O that is adsorbed on particle surface
2This fluoride layer is not having O
2, H
2, H
2It is stable being lower than 600 ℃ of temperature down that O exists, and prevents to form on the matrix material of aluminium powder form 11 oxide compound and absorption O
2, remain to and carry out till next step nitridation process.In addition, in fluorination process, owing on the surface of initial period material in stove, formed fluoride layer, can prevent owing to use fluorine-containing thereafter or fluoride gas makes in the stove material surface further destroy.Among suitably fluorizated aluminium powder form 11 is stored in the powder container 10 that is positioned at the gas treatment chamber bottom.
The aluminium powder form 11 that will be stored in then among the powder container 10 carries out nitriding treatment, uses the heat treatment furnace that is similar to above-mentioned heat treatment furnace 1 during processing.Specifically be that the gas processing chamber interior among this heat treatment furnace is to be heated to 450-550 ℃ nitriding temperature.In the case, with NH
3Gas or NH
3Inject with the gas mixture of the gas of a kind of carbonaceous sources (as RX gas) pneumatic outlet, and aluminium powder form 11 falls into by the powder dispatch tube, come in contact with this gas, thereby above-mentioned fluoride layer is by H by the airway end
2Or the water of trace reduces or destroys (can be represented by following formula), makes this active matrix of aluminium powder form 11 particle surfaces form and comes out.
In this way, the active matrix of described aluminium powder form 11 forms, and has active N atom to enter and be dispersed in the particle of aluminium powder form 11 simultaneously, and the result forms the composite bed (nitride layer) that contains AlN in the upper layer of the matrix of aluminium powder form 11.
Conventional nitriding method can also form similar nitride layer as above-mentioned.Yet in conventional formula method, the activation degree on the surface of this nitride layer is because form oxide skin thereon and reduce when being warming up to nitriding temperature by room temperature, and/or because this time adsorbed O
2And reduce, so the N atom is low and inhomogeneous at this surperficial degree of absorption.Owing to be difficult to remain on NH in the stove actually
3The homogeneity of degree of decomposition, also make above-mentioned inequality expansion.According to manufacture method of the present invention, the absorption of N atom on each particle surface of aluminium powder form 11 not only evenly but also rapid, therefore can be avoided above-mentioned problem.
Its upper layer of each particle of the aluminium powder form 11 of gained all is thin and uniform hard nitride layer A, as shown in Figure 2.
Then, use known H.I.P device 20 gained aluminium powder form 11 is carried out the pressure compacting, obtain the articles made of aluminium alloy of the shape of wanting.
In this way, in manufacture method of the present invention, before carrying out press process with H.I.P device 20, the formed oxide skin of the particle surface of aluminium powder form 11 is removed.Therefore, the aluminium powder form 11 that is mixed with different powder no longer needs heating, so even be mixed with low-melting powder in this aluminium powder form 11, the compacting product of gained still has excellent mechanical properties, because the particle surface layer of aluminium powder form 11 comprises hard nitride layer, so the excellent intensity of tool.
As mentioned above, make by the present invention in the method for aluminium powder form compacting product, before nitridation process, carry out fluorination process, make and inactive coating layer on the aluminium powder particle, change fluoride layer into as oxide skin, and by the particle surface of protection aluminium powder form.Therefore, even forming fluoride layer on the aluminum particle to will be every the long period between the nitridation process, this fluoride layer also can protect and keep the surface of aluminium powder form to be in good condition, can prevent to form oxide skin again at particle surface.In next step nitridation process, this fluoride layer decomposes and is removed, and the particle surface of aluminium powder form is come out.Because the aluminium powder particle surface that exposes is an activatory, the N atom is in the dispersive situation that is easy in nitridation process, so they evenly and in depth are dispersed in the upper layer of aluminium powder form.Because this forms thicker and uniform hard nitride layer at the upper layer of aluminium powder form.Therefore, the made superior mechanical properties of compacting product tool, for example intensity and tenacity.
Fig. 1 is the diagrammatic cross-section of heat treatment furnace used in the one embodiment of the invention.
Fig. 2 is the sectional view in the formed nitride layer situation in aluminium powder particle surface.
Fig. 3 is the H.I.P schematic representation of apparatus.
Hereinafter the present invention is described by an embodiment.
Embodiment
Aluminium powder is earlier through the trichloroethane washing, then in heat treatment furnace shown in Figure 11 in 300 ℃ with contain 5000ppmNF
3N
2Atmosphere contact number minute.Then, with this aluminium powder form in this heat treatment furnace 1 in 530 ℃ with containing 50%NH
3+ 50%N
2Mixed gas carry out nitrogenize number minute, take out with air cooling and from stove 1 then.The thickness of gained nitride layer is 5-10 μ m on this aluminium powder particle, and the surface hardness of this nitride layer is 1900-2100Hv.This hardness ratio is much higher with conventional nitriding method gained person.Then, the aluminium powder form of process nitrogenize is processed in the P device by aforementioned at this H.I, obtains the articles made of aluminium alloy of the shape of wanting.The articles made of aluminium alloy of gained is compared with adopting the routine techniques person, has more superior intensity and tenacity.
Claims (1)
1, a kind of method by aluminium powder form manufacturing compacting product, this method may further comprise the steps:
(1) aluminium powder particle is contacted under heating condition with fluorine-containing or fluoride gas,
(2) make through the fluorizated aluminium powder particle and under heating condition, contact, make the surface of aluminium powder particle form hard nitride layer with nitriding gas,
(3) aluminium powder form of this via nitride is directly suppressed the goods that obtain suppressing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100719 CN1032411C (en) | 1992-01-31 | 1992-01-31 | Process for manufacturing compacted articles of aluminium powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100719 CN1032411C (en) | 1992-01-31 | 1992-01-31 | Process for manufacturing compacted articles of aluminium powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1074841A true CN1074841A (en) | 1993-08-04 |
| CN1032411C CN1032411C (en) | 1996-07-31 |
Family
ID=4938758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92100719 Expired - Fee Related CN1032411C (en) | 1992-01-31 | 1992-01-31 | Process for manufacturing compacted articles of aluminium powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1032411C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050035740A (en) * | 2003-10-14 | 2005-04-19 | 삼성전자주식회사 | Variable capacity rotary compressor |
-
1992
- 1992-01-31 CN CN 92100719 patent/CN1032411C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032411C (en) | 1996-07-31 |
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