CN103658668A - Method for preparing iron-based prealloy powder - Google Patents
Method for preparing iron-based prealloy powder Download PDFInfo
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- CN103658668A CN103658668A CN201310655469.4A CN201310655469A CN103658668A CN 103658668 A CN103658668 A CN 103658668A CN 201310655469 A CN201310655469 A CN 201310655469A CN 103658668 A CN103658668 A CN 103658668A
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- 239000000843 powder Substances 0.000 title claims abstract description 80
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 24
- 238000002360 preparation method Methods 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 9
- 238000009692 water atomization Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000011812 mixed powder Substances 0.000 claims abstract description 4
- 239000011701 zinc Substances 0.000 claims description 13
- 229910052725 zinc Inorganic materials 0.000 claims description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 238000000889 atomisation Methods 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 238000011946 reduction process Methods 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 20
- 229910003460 diamond Inorganic materials 0.000 description 16
- 239000010432 diamond Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 6
- 229910052745 lead Inorganic materials 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004523 agglutinating effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The invention discloses a method for preparing iron-based prealloy powder. The method includes the steps that (1) iron-based bulk metal is prepared, the content of Fe is 30wt%-90wt%, the content of Cu is 10wt%-70wt%, and the melting point is no more than 1,800 DEG C; (2) smelting water atomization powder process treatment is conducted on the metal, so that the iron-based prealloy powder is obtained; (3) the treated powder is dried; (4) after drying of the atomization powder is completed, low-melting metal simple substance powder is added, the melting point is no more than 500 DEG C, and the content is no more than 15wt%; (5) the low-melting metal powder and the dried powder are evenly mixed; (6) reduction treatment is carried out on the mixed powder through a reduction furnace, hydrogen flow is controlled to be 20m<3>/h-30m<3>/h, and reduction time is no less than 2h; (7) large particles are sieved and removed to obtain the iron-based prealloy powder. The method is easy to implement and simple and convenient to operate, by the aid of a high-temperature diffusion and evaporation cohesion principle in the reduction process, the content of produced Zn is 2-15% that of the iron-based prealloy powder, and the iron-based prealloy powder has the advantages of being low in oxygen content, simple in preparation mode and good in cold pressing formability.
Description
Technical field
The present invention relates to diamond carcass material field, be specifically related to a kind of preparation method of iron-based prealloy powder, be applicable in Diamond Tools Industry, diamond adds with low melting point element in iron-based prealloy powder.
Technical background
Prealloy powder is defined as: a kind of metal powder is comprised of two kinds or more element, and these elements are by mechanical means or the fusion completely of other means.In iron-based prealloy powder preparation process, the plumbous grade in the preparation of low-melting-point metal wet method of zinc is difficult for adding because not reducing after being very easily oxidized, being oxidized, present stage is all to adopt simple substance powder to add, and in dry production process, because these metal boiling points are lower, in fusion process, volatilization is serious, also very easily oxidation simultaneously, can not add, low-melting-point metal has a segregation phenomena in diamond tool is made, and it easily runs off in diamond tool sintering process simultaneously.
Tradition diamond tool is mainly produced by mechanical mixture simple substance powder, development along with technology, the present stage production of diamond tool enters the production model with simple substance powder mixing prealloy powder completely, in the pre-alloyed process of these simple substance powder, should not add the low boiling elements such as Zn, Pb.Diamond tool iron-based prealloy powder is produced in water atomization, and the low-melting-point metals such as zinc, lead add difficulty, and the application postscript of these elements in diamond tool it is extensive.Water atomization is at present produced prealloyed powder for diamond tools and is had following shortcoming
1) cold moudling ability;
2) metal such as Zn, Pb adds difficulty, mainly with simple substance powder, add at present, and its skewness, product stability is poor;
3) sintering process is more complicated, need at high temperature carry out diffusion-alloying, then just enters sintering stage sintering temperature wayward;
4) powder size needs strict control;
5) in sintering process, loss is large.
Summary of the invention
The object of the invention is to be to provide a kind of preparation method of iron-based prealloy powder, easy to implement the method, easy and simple to handle, take water atomization iron-based prealloy powder as basis, by High temperature diffusion, evaporation-condensation principle in reduction process, produce zinc content at 2%～15% iron-based prealloy powder, the advantage such as it is low that it has oxygen content, and processing performance is superior, preparation method is simple, cold moudling is good.
In order to realize above-mentioned object, the present invention adopts following technical measures:
A preparation method for iron-based prealloy powder, the steps include:
1) preparation iron-based prealloy powder, comprises following composition: Fe content 30wt%～90wt%, and Cu content 10wt%～70wt%, all the other metals add arbitrarily, and fusing point is no more than 1800 ℃;
2) to the powder of above-mentioned preparation, utilize atomization plant to carry out water atomization processing;
3) vacuum desiccator is to step 2) powder after processing dries, and bake out temperature is controlled at 150～200 ℃, and drying time is controlled at 2～4h;
4) atomized powder, after drying, adds low-melting-point metal simple substance powder, and fusing point is no more than 500 ℃, and its content is no more than 15wt%;
5) metal powder with low melting point mixes with oven dry powder;
6) utilize reduction furnace to do reduction to mixed powder and process, reduction temperature is 400～800 ℃, and hydrogen flowing quantity is controlled at 20m
3/ h～30m
3/ h, the recovery time can not be lower than 2h;
7) bulky grain, iron-based prealloy powder are removed in screening.
All the other metals described in step 1) are a kind of or 2 to the 3 kinds of any combination in Co, Ni, Sn.
Described low-melting-point metal is zinc or lead.
In step 7) ,-200 mesh sieve are used in screening.
The present invention adds the low boiling elements such as Zn, Pb in prealloy powder, make the low boiling elements such as Zn, Pb melt completely with prealloy powder in, form a kind of containing Zn, the New Pre alloyed powder of Pb, its performance characteristics compared with prior art, has the following advantages and effect:
1) cold moudling ability is good;
2) element such as Zn, Pb is evenly distributed, and product is stable;
3) sintering process is simple, easily controls;
4) powder size claimed range is wide, does not need strictly to control granularity;
5) in sintering process, lose little.
The specific embodiment
Embodiment 1:
For a better understanding of the present invention, below in conjunction with embodiment, further illustrate content of the present invention, a kind of preparation method of iron-based prealloy powder, the steps include:
1) prealloy powder is prepared in water atomization, constituent content in alloyed powder: Fe quality percentage composition is 30% or 40% or 60% or 90%, Cu quality percentage composition is 10% or 40% or 55% or 70%, all the other add arbitrarily Co, Ni, Sn metallic element, preparation 100～200kg, fusing point is no more than 1800 ℃, and the water atomization complete set of equipments that adopts Handan blue moral powder by atomization equipment Co., Ltd to produce is prepared iron-based prealloy powder;
2) utilize SZG series double cone rotating vacuum drier to carry out drying and processing to prealloy powder, bake out temperature is
150 ℃ or 180 ℃ or 200 ℃, drying time is 2h or 3h or 4h;
3) low melting point simple substance zinc metal dust mixes with oven dry powder;
4) utilize RDTQ-20-8 model reduction furnace to do reduction to mixed powder and process, reduction temperature is 400 or 450 or 500 or 560 or 610 or 670 or 720 or 780 or 800 ℃, and hydrogen flowing quantity is 20m
3/ h or 25m
3/ h or 30m
3/ h, the recovery time is 2h or 2.5h;
5) adopt the screening of XF triple unit vibration screen to remove bulky grain, obtain meeting-200 order prealloy powder of demand.
The present invention, according to principles such as diffusion, evaporation-condensations, is prepared.Three kinds of powder of invention preparation are as detecting contrast test, in Table 1:
Table 1
Take equally simple substance powder Zn to mix with prealloy powder, test specimen as a comparison, the composition of pre-alloyed powder is:
Table 2
No. 1 powder and the zinc powder that adds 10%, obtain premix powder No. 1;
No. 2 powder and the zinc powder that adds 8%, obtain premix powder No. 2;
No. 1 powder and the zinc powder that adds 12%, obtain premix powder No. 3;
Its method of testing and comparing result are as described below:
Diamond tool powder, its oxygen content has important effect to the performance of carcass, in the present invention, adopts RO-306 nitrogen oxygen analyzer to measure oxygen content.
Table 3
Therefore oxygen content in power of the present invention is obviously better than premixed powder.
Utilize abrasion test to measure the green strength of carcass, forming ability namely, concrete mode is the pressure that adopts 35mpa, 10mm is high in compacting, the cylinder that diameter is 10mm, putting into the gap that thin Fe silk is worked out is 1mm
2prototype rotary barrel in (long 92mm, diameter is 95mm), with the 1200 speed rotations 12min that turn, using the loss of weight as intensity index, wear intensity account form is as follows:
Adopting the cold press compacting appearance and size that the Changjiang river Seiko is produced is 55x10x10mm
3caking, pressing pressure is 80Mpa, carries out wear test:
Table 4
As can be seen here, green strength is obviously strengthened, and the inventive method is produced its forming ability of powder and is better than premixed powder.
In powder metallurgy, a sintering reaction performance that important index is metal dust, good sintering character is exactly that powder can be at a lower temperature or reach at short notice higher density.The powder that sintering character is good, its minimum sintering temperature is not preferably higher than 850 ℃, and high sintering temperature can cause the reduction in sintered body life-span, and diamond carbonization comes off and high energy consumption.A raising that good index is its relative density of agglutinating property, its relative density at least should arrive solid density 96% or higher, its account form:
Appearance and size is 55x10x10mm
3clavate complex in graphite grinding tool, carry out hot pressed sintering 1min, temperature is 820 ℃, pressure is 35mpa, measures density, its result is as table 5:
Table 5
As can be seen here, the powder that the inventive method is produced, its density and sintering character obviously increase.
During diamond tool is produced, most hardness all adopts Rockwell hardness to carry out the test of hardness, according to GB/T230-91 standard, tests.Appearance and size is 55x10x10mm
3clavate complex in graphite grinding tool, carry out hot pressed sintering 1min, temperature is 820 degrees Celsius, pressure is 35mpa, measures hardness, result is as table 6:
Table 6
According to hardness, detect, it is substantially little that its hardness differs, and its hardness number is applicable to the demand of diamond tool;
Mass loss in diamond tool sintering process is called diamond tool flow, and powder mass flow of the present invention obviously reduces, as shown in table 7, and this has also illustrated that sintering character is stable simultaneously.
Appearance and size is 55x10x10mm
3clavate complex in graphite grinding tool, carry out hot pressed sintering 1min, temperature is 820 degrees Celsius, pressure is 35mpa, measurement quality loss: result is as table 7:
Table 7
As seen from the above table: sintering loss, obviously reduce, further illustrating sintering stability increases.
Claims (4)
1. a preparation method for iron-based prealloy powder, the steps include:
1) preparation iron-based reguline metal, comprises following composition: Fe content 30 wt % ~ 90wt%, and Cu content 10 wt % ~ 70 wt %, all the other metals add arbitrarily, and fusing point is no more than 1800 ℃;
2) metal of above-mentioned preparation is carried out to the processing of melting water atomization pulverization, obtain iron-based prealloyed powder;
3) to step 2) powder after processing dries, and bake out temperature is controlled at 150 ~ 200 ℃, and drying time is 2 ~ 4h;
4) atomized powder, after drying, adds low-melting-point metal simple substance powder, and fusing point is no more than 500 ℃, and its content is no more than 15 wt %;
5) metal powder with low melting point mixes with oven dry powder;
6) utilize reduction furnace to do reduction to mixed powder and process, reduction temperature is 400 ~ 800 ℃, and hydrogen flowing quantity is controlled at 20m3/h ~ 30m3/h, and the recovery time is not less than 2h;
7) bulky grain is removed in screening, obtains iron-based prealloy powder.
2. the preparation method of a kind of iron-based prealloy powder as claimed in claim 1, is characterized in that: all the other metals described in step 1) are a kind of or 2 to the 3 kinds of any combination in Co, Ni, Sn.
3. the preparation method of a kind of iron-based prealloy powder as claimed in claim 1, is characterized in that: described low-melting-point metal is zinc or lead.
4. the preparation method of a kind of iron-based prealloy powder as claimed in claim 1, is characterized in that: in described step 7) ,-200 mesh sieve are used in screening.
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