CN101837462B - Method for preparing iron-based powder metallurgy material by using manganiferous reduced iron powder - Google Patents
Method for preparing iron-based powder metallurgy material by using manganiferous reduced iron powder Download PDFInfo
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- CN101837462B CN101837462B CN2010102019004A CN201010201900A CN101837462B CN 101837462 B CN101837462 B CN 101837462B CN 2010102019004 A CN2010102019004 A CN 2010102019004A CN 201010201900 A CN201010201900 A CN 201010201900A CN 101837462 B CN101837462 B CN 101837462B
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Abstract
The invention discloses a method for preparing an iron-based powder metallurgy material by using manganiferous reduced iron powder. The method comprises the following steps of: according to the specified components of the iron-based powder metallurgy material and the mixture ratio of the components, weighing each of the components; at the same time, adding the copper-titanium alloy powder into the components and uniformly mixing the copper-titanium alloy powder and the components; and then sintering and cooling the mixture to the normal temperature to obtain the iron-based powder metallurgy material prepared by using manganiferous reduced iron powder of the invention. In the method, as the activity of the titanium in the copper-titanium alloy is decreased, while the chemical activity of titanium is higher than that of manganese, when the sintering temperature exceeds the liquidus temperature of the copper-titanium alloy, the copper alloy powder is molten and reacts with iron powder particles to be dissolved in the iron powder particles; and after the temperature reaches the reaction temperature of the titanium and magnesium oxide, a reduction reaction is performed to reduce and dissolve the magnesium in the iron particles to realize the solid solution strengthening of an iron substrate. The method has the advantages of simple process, convenient operation, low cost and suitability for industrial production, thereby realizing the preparation of raw materials by using manganese iron scale as the iron-based powder metallurgy material.
Description
Technical field
The invention discloses a kind of utilization and contain the method that the manganese reduced iron powder prepares iron-base powder metallurgy material; Belong to the powdered metallurgical material preparing technical field.
Background technology
The manufacturing raw material of tradition iron-base powder metallurgy material mainly contains reduced iron powder and atomized iron powder.Density is lower than 6.8g/cm
3Iron-base powder metallurgy material adopt the cheaper reduced iron powder of price to make raw material usually.Iron powder enterprise adopts the raw material of the steel scale of steel rolling of low silicomanganese as reduced iron powder usually.But along with industrial circle more improved requirement of strength day of steel, be one of best alloying element of strengthening effect and the most cheap metal alloy element in the ferrous materials based on manganese, manganese is modal alloying element in the ferrous materials in high strength steel.Therefore, manganese is ever-present element in the steel scale of steel rolling of iron company.The raw material that the iron scale that employing contains manganese is made reduced iron powder can bring the suppression performance of reduced iron powder to reduce significantly, and then causes the mechanical property of final iron-base powder metallurgy material to worsen significantly.And the manganese in the iron scale generally exists with oxide form, and is evenly distributed in the ferriferous oxide, even after iron is reduced, also can not Mn oxide be separated by magnetic separation and improve iron powder purity.Therefore, with the steel scale of steel rolling be in the reduced iron powder produced of raw material usually manganese content reach about 0.45%.Adopt powdered metallurgical material density that the reduced iron powder of such purity makes generally at 6.5g/cm
3About, mechanical property is very low, and application is very limited.So under existing technical merit, the reduced iron powder that is prepared by the including Mn-Fe squama does not have too many industrial application value in powdered metallurgical material manufacturing field.For the potential economic worth of developing this class including Mn-Fe squama with satisfy the growing needs of iron-base powder metallurgy material industry to reduced iron powder, development and use contain the manganese reduced iron powder and become very urgent.
Goal of the invention
The objective of the invention is to overcome the deficiency of prior art and provide a kind of process simple, the utilization easy to operate, that cost is low contains the method that the manganese reduced iron powder prepares iron-base powder metallurgy material, the present invention not only can effectively utilize the manganese element in the including Mn-Fe squama, improves the iron-base powder metallurgy material intensity of including Mn-Fe squama preparation; And making the including Mn-Fe squama make raw material as iron-base powder metallurgy material becomes possibility.
A kind of utilization of the present invention contains the method that the manganese reduced iron powder prepares iron-base powder metallurgy material, comprises the steps:
The first step: batching
Iron-base powder metallurgy material component and proportioning according to design take by weighing each component, simultaneously, in described component, add the Cu-Ti alloy powder, described Cu-Ti alloy powder addition according to the manganese content in the reduced iron powder in the component in mass ratio: Mn: Cu: Ti=1: (3-5): ratio (0.4-0.6) is added, and mixes;
Second step: sintering
First step gained mixture was heated to 1100-1150 ℃ of sintering 45-60 minute, is chilled to normal temperature, promptly obtain the iron-base powder metallurgy material that utilization of the present invention contains the preparation of manganese reduced iron powder.
Among the present invention, described reduced iron powder is directly reduced by the including Mn-Fe squama and makes.
Among the present invention, describedly be sintered to a kind of in vacuum-sintering, cracked ammonium protective atmosphere sintering, the nitrogen protection atmosphere sintering.
The present invention is owing to adopt above-mentioned process, utilize the activity of titanium in copper-titanium alloy to reduce, and the chemism of Titanium is than manganese height, after sintering temperature surpasses the liquidus temperature of copper-titanium alloy, copper alloy powder melt immediately and rapidly and ferrous powder granules generation solid-liquid alloying reaction be dissolved in the ferrous powder granules, reduce the touch opportunity of oxygen in Titanium and the sintering atmosphere.Reach the reaction temperature of Titanium and Mn oxide when temperature after, reduction reaction takes place manganese metal is restored.The manganese metal that restores is dissolved in the solution strengthening that realizes in the iron particle the iron-based body.Because very high, the easy oxidation of Titanium activity adopts the copper-titanium alloy form of powder to add, utilize the activity of titanium in copper-titanium alloy to reduce the oxidation that can alleviate titanium in sintering process significantly.In addition, to compare price more cheap for titanium and other active strong element.The present invention has not only made full use of the strongization effect of alloying element manganese to the iron-based body, and makes the including Mn-Fe squama become possibility as iron-base powder metallurgy material manufacturing raw material.
Major advantage of the present invention and good effect are:
1, utilize Titanium than the higher affinity between manganese metal and the oxygen, with the reduction of the Mn oxide in the manganese metal reduced iron powder, manganese metal has been realized reinforcement to the iron-based body in the iron-base part sintering process.
2, the reduced iron powder that contains 0.45%Mn does not possess industrial application value in the iron-base powder metallurgy material field of making because of suppression performance is very poor, and the present invention has utilized manganese element wherein the reinforcement of iron-based body to be improved the intensity of ferrous based powder metallurgical, solve the big application difficult problem of iron scale in powdered metallurgical material of this class stock number, improved the use value of this class iron scale.
3, intensity and the Fe-3Ni-2Cu-0.6C of the iron-base powder metallurgy material of being made by the present invention (Fe-1.5Ni-2Cu-0.45Mn-0.5C) are suitable, and material cost reduction by 20%, and the consumption of having saved rare metal Ni.
In sum, process of the present invention is simple, and is easy to operate, cost is low, is suitable for suitability for industrialized production, makes full use of the strongization effect of alloying element manganese to the iron-based body, and makes the including Mn-Fe squama make raw material as iron-based powder metallurgy parts to become possibility.
The specific embodiment
Embodiment 1:
The powdered metallurgical material of preparation is: Fe-1.5Ni-2Cu-0.45Mn-0.5C-0.22Ti;
The first step: batching
-100 orders are prepared by the design composition by the reduced iron powder that contains 0.45%Mn and metal nickel powder, Cu-10Ti alloyed powder, graphite powder that the direct reduction of including Mn-Fe squama makes, wherein Mn: Cu: Ti=0.45: 2: 0.22; The zinc stearate of interpolation 0.6% is made lubricant, mixes;
Second step: sintering
First step gained mixture is heated to 1100 ℃ of sintering 45 minutes at cracked ammonium protective atmosphere sintering furnace, is chilled to normal temperature, promptly obtain the iron-base powder metallurgy material that utilization of the present invention contains the preparation of manganese reduced iron powder.
After tested, the tensile strength of the sintered iron base material of present embodiment preparation is 417MPa, and hardness is HRB66.And composition is the tensile strength of Fe-3Ni-2Cu-0.6C material is 310MPa, and hardness is HRB63.Therefore, the Fe-1.5Ni-2Cu-0.45Mn-0.5C-0.22Ti strength of materials has improved 34.5% than Fe-3Ni-2Cu-0.6C material, and the nickel powder use amount has reduced 50%, and material cost reduces by 20%.
Embodiment 2
The powdered metallurgical material of preparation is: Fe-1.5Ni-3Cu-0.45Mn-0.5C-0.22Ti;
The first step: batching
-100 orders are prepared by the design composition by the reduced iron powder that contains 0.45Mn and metal nickel powder, Cu-10Ti alloyed powder, graphite powder that the direct reduction of including Mn-Fe squama makes, wherein Mn: Cu: Ti=0.45: 3: 0.3; The zinc stearate of interpolation 0.6% is made lubricant, mixes;
Second step: sintering
First step gained mixture is heated to 1120 ℃ of sintering 50 minutes at vacuum sintering furnace, is chilled to normal temperature, promptly obtain the iron-base powder metallurgy material that utilization of the present invention contains the preparation of manganese reduced iron powder.
After tested, the tensile strength of the sintered iron base material of present embodiment preparation is 423MPa, and hardness is HRB68.And composition is the tensile strength of Fe-3Ni-2Cu-0.6C material is 310MPa, and hardness is HRB63.Therefore, the Fe-1.5Ni-3Cu-0.45Mn-0.5C-0.22Ti strength of materials has improved 36.45% than Fe-3Ni-2Cu-0.6C material, and the nickel powder use amount has reduced 50%, and material cost reduces by 18%.
Claims (3)
1. a utilization contains the method that the manganese reduced iron powder prepares iron-base powder metallurgy material, comprises the steps:
The first step: batching
Iron-base powder metallurgy material component and proportioning according to design take by weighing each component, simultaneously, in described component, add the Cu-Ti alloy powder, described Cu-Ti alloy powder addition according to the manganese content in the reduced iron powder in the component in mass ratio: Mn: Cu: Ti=1: (3-5): ratio (0.4-0.6) is added, and mixes;
Second step: sintering
First step gained mixture was heated to 1100-1150 ℃ of sintering 45-60 minute, is chilled to normal temperature, promptly obtain utilizing the iron-base powder metallurgy material that contains the preparation of manganese reduced iron powder.
2. a kind of utilization according to claim 1 contains the method that the manganese reduced iron powder prepares iron-base powder metallurgy material, it is characterized in that: described reduced iron powder is directly reduced by the including Mn-Fe squama and makes.
3. a kind of utilization according to claim 2 contains the method that the manganese reduced iron powder prepares iron-base powder metallurgy material, it is characterized in that: describedly be sintered to a kind of in vacuum-sintering, cracked ammonium protective atmosphere sintering, the nitrogen protection atmosphere sintering.
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| CN2010102019004A CN101837462B (en) | 2010-06-17 | 2010-06-17 | Method for preparing iron-based powder metallurgy material by using manganiferous reduced iron powder |
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| CN2010102019004A CN101837462B (en) | 2010-06-17 | 2010-06-17 | Method for preparing iron-based powder metallurgy material by using manganiferous reduced iron powder |
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| CN101837462B true CN101837462B (en) | 2011-09-07 |
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| CN1132711C (en) * | 2001-01-04 | 2003-12-31 | 中南大学 | Method for making warm-pressing iron powder |
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