CN103084569B - A kind of low-alloy content iron-based powder of additive activating and prepare the method for agglomerated material - Google Patents
A kind of low-alloy content iron-based powder of additive activating and prepare the method for agglomerated material Download PDFInfo
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Abstract
The invention discloses a kind of low-alloy content iron-based powder of additive activating and prepare the method for agglomerated material.It with the addition of the superfines of a small amount of copper and copper phosphide in the alloyed powder such as atomized iron powder and nickel, and the preparation method of this ferrous alloy agglomerated material is for sintering this powder mixed uniformly pressing one-time, or first low temperature presintering, then repressing and re-sintering.Ultra-fine copper phosphide powder in iron base powder mixture end of the present invention effectively can increase the compacting lubricity of iron powder, promotes the nodularization of matrix mesopore under relatively lower temp, improves the density of sintered body.Employing 600 ~ 700MPa suppresses next time and once sintered extrudate density can reach 7.22g/cm
3, under 700 ~ 800MPa, the extrudate density of multiple pressure and resintering can reach 7.52g/cm
3, and there is higher mechanical property.
Description
Technical field
The invention belongs to the preparation method of iron-base powder metallurgy material, particularly relate to and prepare the low-alloy content iron-based powder of superior performance and the method for agglomerated material thereof by the selection of additive with design.
Background technology
PM technique have material-saving, energy-conservation, low cost can produce features such as to have nearly whole form and dimensional precision part in enormous quantities, be typical green manufacture technology.
The powdered metallurgical material that iron-base powder metallurgy material one class is important, iron-based powder and goods account for 70% of powder metallurgy market, and with regard to iron-base powder metallurgical product, gear is that application quantity is maximum, widest in area, the representational type component of most.Powder metallurgic method manufactures gear and has the advantages that stock utilization is high, density is controlled, noise grade is little, cost is low, applies widely in the various Gear Production such as automobile, motorcycle, electromechanics.Adopt the conventional powder metallurgical explained hereafter component density out of a press/sintering generally lower than 7.2g/cm
3, still can not be directly used in car transmissions.When density reaches more than 7.2g/cm, the mechanical properties such as its tensile strength, hardness, fatigue strength all can increase in geometric progression with the increase of density.Inefficacy major part due to gear is that surface contact is tired, therefore when density reaches 7.2g/cm
3above, the heart portion of sintered gear(s) can reach certain requirement of strength, and gear surface improves its anti-fatigue performance by various surface densification technology.
The development of ferrous based powder metallurgical depends primarily on the technology that can provide the more high product of density now, extrudate density improves that main so far what rely on is the improvement of powder preparation and pressing process, comprises high-compressibility material powder, repressing and re-sintering, power forging, temperature and pressure, high velocity compacted etc.Repressing and re-sintering technology is corresponding due to extra operation adds cost, and should control at reduced levels by cost increase by improving, the iron-base powder metallurgical product density usually adopting repressing and re-sintering to prepare is 7.3 ~ 7.4g/cm
3, the space be still improved.Power forging can be prepared close to fully dense sintered metal product, but owing at high temperature carrying out, require higher, and the surface smoothness of goods is poor to mould.T-P environment is utilize organic thawing and fill the lubricant effect increased between powder particle, and organic discharge is unfavorable for improving sintered density, and easily causes environmental pollution.High velocity compacted is restricted when preparing the goods of shape relative complex.
Sintering uses the widest a kind of alloy strengthening mode, in ferrous based powder metallurgical, also improves the density of sintered article by liquid-phase sintering.Phosphide is (as Cu
3p, Fe
3p etc.) be a kind of typical sintering activator, in high alloy content ferrous based powder metallurgical especially powder stainless steel and Powder High-speed Steels, having more research, (main literature has: R M German.Supersolidus liquid phase sintering, part I: process review.International Journal of PowderMetallurgy, 1990,26 (1): 23, S K Jensen, E Maahn.Sintering additive for liquid phase sintering ofAISI316L stainless steel.Powder Metallurgy World Congress, 1994, VIII:2113-2116, A Molinari, G Straffelini, T Pieczonka, J Kazior.Persistent liquid phase sintering of316L stainless steel.International Journal of Powder Metallurgy, 1998,34 (2): 21-28, H Preusse, J D Bolton.Use ofphosphide phase additions to promote liquid phase sintering in316L stainless steels.PowderMetallurgy, 1999,42 (1): 51-62, F Akhtar, S J Guo, K A Shah.Effect of Cu
3p addition on sinteringbehaviour ofelemental powders in the composition of465stainless steel.Powder Metallurgy, 2006, 49 (1): 28-33.), also mention copper phosphide in patent " a kind of reinforced sintering method of powder stainless steel " (number of patent application 200510053521.4) and prepare 316L stainless steel as sintering activator, but the addition of copper phosphide is at least about 0.3wt.% at the content of 2wt.%(and P usually) more than, be preferably 4 ~ 8wt.%, and report is rarely had in low-alloy content (total alloy content≤5wt.%) iron-base powder metallurgy material.Because phosphorus (P) has the effect (P content is closed higher than γ-Fe phase region during 0.6wt.%) of expansion α-Fe phase region and closed γ-Fe phase region, and the self-diffusion coefficient of iron atom in α-Fe is than high about 100 times in γ-Fe, utilizes Fe
3there is the feature of eutectic reaction at 1050 DEG C in P-Fe, the vacuum-sintering at 1150 DEG C such as the high-speed steel T15 of interpolation 9.4wt.% (Cu-8.5%P) eutectic alloy powder obtains fully dense material.It is generally acknowledged that phosphorus too high levels in fine and close ferrous materials can cause the cold short of steel, reduce plasticity, belong to harmful element, although the impact in iron-base powder metallurgy material mesopore on matrix mechanical property is greater than the effect of phosphorus, but carrying highdensity while, also should control the content of phosphorus, eliminate the adverse effect of phosphorus.In addition, patent " a kind of low-temperature sintering method of high-performance Fe-based powder metallurgy parts " (number of patent application: the method by adding copper nanoparticle in common iron powder end 201110070535.2) significantly reduces its sintering temperature, but the solubility of copper in iron matrix is greater than the solubility of iron in copper at a sintering temperature, adding separately copper nanoparticle, to play liquid-phase sintering effect very limited.
Summary of the invention
Technical problem to be solved by this invention avoids weak point existing in above-mentioned prior art, a kind of low-alloy content iron-based powder of additive activating is provided and prepares the method for agglomerated material, the raw material providing this material is selected, Composition Design, and its manufacturing process.
A low-alloy content iron-based powder for additive activating,
By iron(-)base powder, copper phosphide (Cu
3p), copper powder and lubricant composition, wherein copper accounts for 0.5 ~ 1.5wt.%, and copper phosphide accounts for 20 ~ 80wt.% of copper powder and copper phosphide powder gross mass; The granulometric range of copper powder is: 0.05 ~ 10 μm, and the granulometric range of copper phosphide powder is: 0.05 ~ 10 μm.
Described iron(-)base powder is made up of water-atomized iron powder, carbonyl nickel powder, molybdenum powder and graphite, and in the low-alloy content iron-based powder of additive activating, the mass content of nickel is 1.5 ~ 2wt.%, the mass content of molybdenum is 0.3 ~ 0.5wt.%, the mass content of carbon is 0.4 ~ 0.8wt.%, lubricant accounts for 0.2-0.8wt.%.
Also water atomization iron molybdenum prealloy powder can be contained in described iron(-)base powder.
In the low-alloy content iron-based powder of above-mentioned additive activating, copper preferably accounts for 0.6 ~ 1.2wt.% of the low-alloy content iron-based powder quality of additive activating, and copper phosphide preferably accounts for 30 ~ 70wt.% of copper powder and copper phosphide powder gross mass; The granulometric range of copper powder is preferably 0.2 ~ 5 μm, and the granulometric range of copper phosphide powder is preferably 0.2 ~ 5 μm.
Described carbonyl nickel powder granularity≤15 μm; Described molybdenum powder granularity≤45 μm; The particle size range of described water-atomized iron powder is 20 ~ 300 μm, and granularity is not less than the 80wt.% of water-atomized iron powder gross weight at the particle of 45 ~ 180 μm, and apparent density is not less than 2.8g/cm
3, mobility is not more than 29s/50g.
In described water atomization iron molybdenum prealloy powder, molybdenum content is 0.5 ~ 0.8wt.%, and water atomization iron molybdenum prealloy powder particle size range is 20 ~ 200 μm, and apparent density is not less than 2.8g/cm
3, mobility is not more than 30s/50g.
Described lubricant comprises one or more the combination in lithium stearate, zinc stearate, metallic soap, ethylene bis stearamide, fatty acid amide.
The low-alloy content iron-based powder of above-mentioned additive activating prepares the method for low-alloy content ferrous alloy agglomerated material, by a pressing one-time sintering after the low-alloy content iron-based powder Homogeneous phase mixing of described additive activating, or first low temperature presintering, more namely repressing and re-sintering obtains; Specifically by the low-alloy content iron-based powder of described additive activating, mixing, suppress under the pressure of 600 ~ 700MPa, is 400 ~ 500 DEG C of insulations 0.5 hour in temperature, be warming up to 650 ~ 850 DEG C of pre-burnings 0.5 ~ 1 hour again, then with any one preparation in following two kinds of modes:
1) be directly be warming up to 1050 ~ 1200 DEG C of insulations 0.5 ~ 1.5 hour, namely complete a pressing one-time sintering, obtain agglomerated material;
2) be by pre-burning after base substrate be cooled to room temperature, under the pressure of 600 ~ 800MPa, carry out multiple pressure, then at 1050 ~ 1200 DEG C sinter 0.5 ~ 1.5 hour, namely complete repressing and re-sintering, obtain agglomerated material.
Described pre-burning and sintering are all carry out in nitrogen atmosphere sintering furnace.
Why the present invention can improve iron-based powder metallurgy parts performance, its original creation part is: one, because copper phosphide is a kind of brittle substance, the ultra-fine copper phosphide be distributed in around matrix iron powder has certain lubricant effect, is conducive to the rearrangement of iron matrix particle in pressing process.Its two, the superfine powder activity of copper and copper phosphide is higher, can, in reaction solution phase under relatively lower temp, make iron matrix obtain rapid diffusion at α-Fe phase region, impels the nodularization of the densified of matrix and hole.Its three, although the interpolation total amount of copper and copper phosphide superfine powder is less, the highest 1.4wt.% that is about of copper phosphide, its particle mean size is little, can more be evenly distributed in matrix powder, is conducive to more sintering neck and is formed under relatively lower temp.In addition, the alloying element such as nickel, molybdenum density is close with iron, easily mixes, and adds thin carbonyl nickel powder and is more conducive to solid solution in iron-based body, and can accelerate the diffusion of iron, molybdenum can expand α-Fe phase region, better can play the effect of phosphorous liquid-phase sintering simultaneously.
The present invention utilizes a small amount of superfine powder to provide the feature of low-temp liquid-phase sintering, can reach 7.22g/cm by the extrudate density of the pressing one-time sintering preparation of routine
3, adopt the extrudate density of repressing and re-sintering to reach 7.52g/cm
3, and there is higher mechanical property.The present invention has that preparation technology is simple, production efficiency is high, extrudate density and mechanical property and dimensional accuracy high.
Accompanying drawing explanation
Fig. 1 is the density of ferrous alloy mixed powder once pressing blank on 600MPa that the present invention adds the ultra-fine copper phosphide of different content;
Fig. 2 does not add ultra-fine copper phosphide the present invention and the microstructure of adding iron-based presintered compact prepared by ultra-fine copper phosphide.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, but should not limit the scope of the invention with this.
Adopt water-atomized iron powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), carbonyl nickel powder, graphite, ultra-fine copper phosphide powder and copper powder and lubricant to be that raw material is made into mixed powder, wherein nickel (Ni) 1.5 ~ 2wt.%, molybdenum (Mo) 0.3 ~ 0.5wt.%, graphite 0.4 ~ 0.8wt.%, copper 0.5 ~ 1.5wt%, copper phosphide account for 20 ~ 80wt.% of copper powder and copper phosphide powder gross mass; The addition of lubricant is 0.2 ~ 0.8wt% of raw material gross mass.By each raw material with to load in mixing machine and to seal, planetary batch mixer mixes.Then be pressed under the pressure of 600MPa, compacting green compact are placed in nitrogen atmosphere sintering furnace, be 400 ~ 500 DEG C in temperature and be incubated 0.5 hour, be warming up to 650 ~ 850 DEG C of pre-burnings 0.5 ~ 1 hour again, obtain the microscopic structure of presintered compact as shown in Figure 2 b, (Fig. 2 a) contrasts, and between the presintered compact iron-based grains that simultaneously with the addition of ultra-fine copper phosphide powder and copper powder, fine gap is less with the non-acid gilding phase constitution of the presintered compact that only with the addition of superfine cupper powder, hole is less, close to nodularization.
Sinter at the base substrate of 650 ~ 850 DEG C of pre-burnings can directly be warming up to 1050 ~ 1200 DEG C, temperature retention time 0.5 ~ 1.5 hour, promotes the complete alloying of each alloying element, and the density of the iron based material obtained can reach 7.22g/cm
3, bending strength is 900 ~ 960MPa, and hardness is 54 ~ 58HRB.Presintered compact also can carry out multiple pressure under the pressure of 600 ~ 800MPa, then sintering at 1050 ~ 1200 DEG C under a hydrogen atmosphere, and temperature retention time 0.5 ~ 1.5 hour, the density of the iron based material obtained can reach 7.52g/cm
3, bending strength is 1150 ~ 1260MPa, and hardness is 75 ~ 82HRB.
Embodiment 1
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.2wt% is accounted for by nickel 1.5wt.%, molybdenum 0.3wt.%, graphite 0.4wt.%, copper 0.5wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.05 ~ 0.2 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Then be pressed under the pressure of 600MPa, compacting green compact are placed in nitrogen atmosphere sintering furnace, be 400 ~ 500 DEG C of pre-burnings 0.5 hour in temperature, be warming up to 650 ~ 850 DEG C of insulations 0.5 ~ 1 hour again, sinter 0.5 ~ 1.5 hour at being finally warming up to 1050 ~ 1200 DEG C, the density of the iron based material obtained is 7.20g/cm
3, bending strength is 900MPa, and hardness is 54.2HRB.
Embodiment 2
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.4wt% is accounted for by nickel 1.5wt.%, molybdenum 0.4wt.%, graphite 0.5wt.%, copper 0.7wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.1 ~ 1 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 1, and the density of the iron based material obtained is 7.20g/cm
3, bending strength is 908MPa, and hardness is 54.6HRB.
Embodiment 3
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.6wt% is accounted for by nickel 1.5wt.%, molybdenum 0.5wt.%, graphite 0.6wt.%, copper 0.9wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.2 ~ 5 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 1, and the density of the iron based material obtained is 7.21g/cm
3, bending strength is 916MPa, and hardness is 55.1HRB.
Embodiment 4
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.8wt% is accounted for by nickel 2wt.%, molybdenum 0.3wt.%, graphite 0.4wt.%, copper 1.1wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.5 ~ 5 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 1, and the density of the iron based material obtained is 7.23g/cm
3, bending strength is 932MPa, and hardness is 56.1HRB.
Embodiment 5
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 1.0wt% is accounted for by nickel 2wt.%, molybdenum 0.4wt.%, graphite 0.6wt.%, copper 1.3wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 1 ~ 10 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 1, and the density of the iron based material obtained is 7.22g/cm
3, bending strength is 955MPa, and hardness is 57.2HRB.
Embodiment 6
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 1.2wt% is accounted for by nickel 2wt.%, molybdenum 0.5wt.%, graphite 0.8wt.%, copper 1.5wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 1 ~ 10 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 1, and the density of the iron based material obtained is 7.20g/cm
3, bending strength is 961MPa, and hardness is 58.3HRB.
Embodiment 7
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.2wt% is accounted for by nickel 1.5wt.%, molybdenum 0.3wt.%, graphite 0.4wt.%, copper 0.5wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.05 ~ 0.2 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Then be pressed under the pressure of 600MPa, compacting green compact are placed in nitrogen atmosphere sintering furnace, be 400 ~ 500 DEG C of pre-burnings 0.5 hour in temperature, be warming up to 650 ~ 850 DEG C of insulations again and obtain presintered compact in 0.5 ~ 1 hour, presintered compact is carried out multiple pressure under the pressure of 800MPa, sintering 0.5 ~ 1.5 hour at 1050 ~ 1200 DEG C under a hydrogen atmosphere again, the density of the iron based material obtained can reach 7.48g/cm
3, bending strength is 1151MPa, and hardness is 75.2HRB.
Embodiment 8
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.4wt% is accounted for by nickel 1.5wt.%, molybdenum 0.4wt.%, graphite 0.5wt.%, copper 0.7wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.1 ~ 1 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 7, and the density of the iron based material obtained is 7.51g/cm
3, bending strength is 1172MPa, and hardness is 75.9HRB.
Embodiment 9
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.6wt% is accounted for by nickel 1.5wt.%, molybdenum 0.5wt.%, graphite 0.6wt.%, copper 0.9wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.2 ~ 5 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 7, and the density of the iron based material obtained is 7.53g/cm
3, bending strength is 1199MPa, and hardness is 76.8HRB.
Embodiment 10
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 0.8wt% is accounted for by nickel 2wt.%, molybdenum 0.3wt.%, graphite 0.4wt.%, copper 1.1wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 0.5 ~ 5 μm, is mixed by each raw material on planetary batch mixer.Other condition is with embodiment 7, and the density of the iron based material obtained is 7.52g/cm
3, bending strength is 1225MPa, and hardness is 78.1HRB.
Embodiment 11
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 1.0wt% is accounted for by nickel 2wt.%, molybdenum 0.4wt.%, graphite 0.6wt.%, copper 1.3wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 1 ~ 10 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 7, and the density of the iron based material obtained is 7.51g/cm
3, bending strength is 1246MPa, and hardness is 79.9HRB.
Embodiment 12
Employing water-atomized iron powder, carbonyl nickel powder, molybdenum powder (or water atomization iron molybdenum prealloy powder replaces part water-atomized iron powder and molybdenum powder), graphite, ultra-fine copper phosphide powder and copper powder are raw material, 1.2wt% is accounted for by nickel 2wt.%, molybdenum 0.5wt.%, graphite 0.8wt.%, copper 1.5wt%, copper phosphide, prepare burden with the lubricant of 0.6wt.%, wherein the particle size range of copper phosphide and copper is 1 ~ 10 μm, each raw material to be loaded in mixing machine and to seal, planetary batch mixer mixes.Other condition is with embodiment 7, and the density of the iron based material obtained is 7.50g/cm
3, bending strength is 1260MPa, and hardness is 82.1HRB.
Claims (9)
1. a low-alloy content iron-based powder for additive activating, is characterized in that,
Be made up of iron(-)base powder, copper phosphide powder, copper powder and lubricant, wherein copper accounts for 0.5 ~ 1.5wt.%, and copper phosphide accounts for 20 ~ 80wt.% of copper powder and copper phosphide powder gross mass; The granulometric range of copper powder is: 0.05 ~ 10 μm, and the granulometric range of copper phosphide powder is: 0.05 ~ 10 μm;
Described iron(-)base powder is made up of water-atomized iron powder, carbonyl nickel powder, molybdenum powder and graphite, in the low-alloy content iron-based powder of additive activating, the mass content of nickel is 1.5 ~ 2wt.%, the mass content of molybdenum is 0.3 ~ 0.5wt.%, the mass content of carbon is 0.4 ~ 0.8wt.%, and lubricant addition is the 0.2-0.8wt.% of the low-alloy content iron-based powder of additive activating.
2. the low-alloy content iron-based powder of additive activating according to claim 1, is characterized in that,
Also containing water atomization iron molybdenum prealloy powder in described iron(-)base powder.
3. the low-alloy content iron-based powder of additive activating according to claim 1, it is characterized in that, copper accounts for 0.6 ~ 1.2wt.% of the low-alloy content iron-based powder quality of additive activating, and copper phosphide accounts for 30 ~ 70wt.% of copper powder and copper phosphide powder gross mass; The granulometric range of copper powder is 0.2 ~ 5 μm, and the granulometric range of copper phosphide powder is 0.2 ~ 5 μm.
4. the low-alloy content iron-based powder of additive activating according to claim 1, is characterized in that, described carbonyl nickel powder granularity≤15 μm; Described molybdenum powder granularity≤45 μm; The particle size range of described water-atomized iron powder is 20 ~ 300 μm, and granularity is not less than the 80wt.% of water-atomized iron powder gross weight at the particle of 45 ~ 180 μm, and apparent density is not less than 2.8g/cm
3, mobility is not more than 29s/50g.
5. the low-alloy content iron-based powder of additive activating according to claim 2, it is characterized in that, in described water atomization iron molybdenum prealloy powder, molybdenum content is 0.5 ~ 0.8wt.%, and water atomization iron molybdenum prealloy powder particle size range is 20 ~ 200 μm, and apparent density is not less than 2.8g/cm
3, mobility is not more than 30s/50g.
6. the low-alloy content iron-based powder of additive activating according to claim 1, is characterized in that, described lubricant comprises one or more the combination in lithium stearate, zinc stearate, metallic soap, ethylene bis stearamide, fatty acid amide.
7. the low-alloy content iron-based powder of the additive activating described in any one of claim 1-6 prepares the method for low-alloy content ferrous alloy agglomerated material, it is characterized in that, by a pressing one-time sintering after the low-alloy content iron-based powder Homogeneous phase mixing of described additive activating, or first low temperature presintering, more namely repressing and re-sintering obtains.
8. method according to claim 7, it is characterized in that: by the low-alloy content iron-based powder of described additive activating, mix, suppress under the pressure of 600 ~ 700MPa, be 400 ~ 500 DEG C in temperature and be incubated 0.5 hour, be warming up to 650 ~ 850 DEG C of pre-burnings 0.5 ~ 1 hour again, then with any one preparation in following two kinds of modes:
1) be directly be warming up to 1050 ~ 1200 DEG C of insulations 0.5 ~ 1.5 hour, namely complete a pressing one-time sintering, obtain agglomerated material;
2) be by pre-burning after base substrate be cooled to room temperature, under the pressure of 600 ~ 800MPa, carry out multiple pressure, then at 1050 ~ 1200 DEG C sinter 0.5 ~ 1.5 hour, namely complete repressing and re-sintering, obtain agglomerated material.
9. method according to claim 8, is characterized in that, described pre-burning and sintering are all carry out in nitrogen atmosphere sintering furnace.
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| CN109128189B (en) * | 2018-07-16 | 2021-08-27 | 扬州海昌新材股份有限公司 | Manufacturing method of speed-regulating three-jaw inner gear ring |
| CN112453387A (en) * | 2020-11-27 | 2021-03-09 | 深圳市日东科技发展有限公司 | Powder metallurgy-based high-density stainless steel product formula and process thereof |
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