WO2015182398A1 - Mixed powder for powder metallurgy - Google Patents
Mixed powder for powder metallurgy Download PDFInfo
- Publication number
- WO2015182398A1 WO2015182398A1 PCT/JP2015/063889 JP2015063889W WO2015182398A1 WO 2015182398 A1 WO2015182398 A1 WO 2015182398A1 JP 2015063889 W JP2015063889 W JP 2015063889W WO 2015182398 A1 WO2015182398 A1 WO 2015182398A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- powder
- iron
- graphite
- mixed
- less
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/12—Metallic powder containing non-metallic particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0207—Using a mixture of prealloyed powders or a master alloy
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F2003/023—Lubricant mixed with the metal powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/10—Copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/35—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
- B22F2302/40—Carbon, graphite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2303/00—Functional details of metal or compound in the powder or product
- B22F2303/01—Main component
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the present invention relates to a powder metallurgy technique for producing a sintered body by molding and sintering a mixed powder whose main raw material is an iron-based powder, and in particular, a molded body obtained by improving the filling property of the mixed powder into a mold.
- the present invention relates to a powder mixture for powder metallurgy that can reduce the weight variation of the powder.
- powder metallurgy for producing a sintered body using iron powder or copper powder as a main raw material usually powder of the main raw material, graphite powder for improving the physical properties of the sintered body, auxiliary raw material powder such as an alloy component, A mixed powder containing a lubricant or the like is used.
- a carbon supply component such as graphite is added, that is, a carbon source is added, and the carbon source is subsequently formed during the heating and sintering process. Is generally diffused and permeated into the iron powder.
- the first method is a method in which a liquid additive such as tall oil is added to the mixed powder as described in Patent Documents 1 and 2, for example.
- a liquid additive such as tall oil
- Patent Documents 1 and 2 for example.
- the second method is a method in which a solid binder such as a polymer is dissolved in a solvent and uniformly mixed, and then the solvent is evaporated and graphite is attached to the surface of the iron powder as in Patent Documents 3 and 4 and the like. is there.
- This method has the advantage that graphite can be reliably attached and the choice of lubricant to be used is wide, but depending on the amount and type, the flowability of the mixed powder is insufficient or the compressibility is low. There is a problem of lowering.
- the third method is a so-called hot melt method in which a relatively low molecular weight lubricant such as a fatty acid is heated and melted during mixing with iron powder as disclosed in Patent Document 5 and the like.
- Patent Document 6 filed by the present applicant, unlike the above-described three methods, graphite having a controlled average particle diameter is mixed with iron-based powder while applying a shearing force without adding a binder.
- the technique describes that the fluidity of the mixed powder is also excellent.
- the powder metallurgy method when the mixed powder is discharged from the storage hopper and filled into the mold, the flowability of the mixed powder is one of the important characteristics.
- the fluidity of the mixed powder stipulated in JIS Z2502 is used as an index of fluidity.
- the mixed powder is discharged from the hopper through a hose and put into a mold.
- Good filling that is, mold filling property is also an important characteristic. When the filling property of the mold is lowered, the weight variation of the molded body is caused.
- An object of the present invention is to provide a mixed powder for powder metallurgy that can improve the filling property of the mold and reduce the weight variation of the molded body.
- the mixed powder for powder metallurgy according to the present invention that has achieved the above-mentioned problems is obtained by adding graphite powder having an average particle diameter D50 of 1.0 ⁇ m or more and 3.0 ⁇ m or less and D90 of 10 ⁇ m or less without adding a binder, It is obtained by mixing with iron-based powder while applying a shearing force.
- the mixed powder for powder metallurgy of the present invention thus obtained is a mixed powder for powder metallurgy characterized by including an iron-based powder and a graphite powder that is present in the recesses of the iron-based powder. is there.
- the graphite powder preferably has an average particle diameter D50 of 1.6 ⁇ m or more and 2.7 ⁇ m or less, and the iron-based powder is preferably atomized iron powder or reduced iron powder.
- the graphite powder having D50 and D90 in a predetermined range is mixed with the iron-based powder while applying a shearing force without adding a binder, the graphite powder is in the recess of the iron-based powder. As a result, it is possible to ensure good mold filling properties and reduce the weight variation of the molded body.
- FIG. 1 is a schematic view of a mold filling property evaluation apparatus used in Examples described later
- FIG. 1 (a) is a front view
- FIGS. 1 (b) to 1 (d) are sectional views showing operating states. It is.
- FIG. 2 is a scanning electron micrograph of the mixed powder of the present invention observed in the examples described later.
- FIG. 3 is a scanning electron micrograph of the mixed powder of the present invention observed in the examples described later.
- Graphite powder obtained by pulverization iron powder (manufactured by Kobe Steel, Atmel 300M, particle size: 180 ⁇ m or less, average particle size: 70 ⁇ m), copper powder (manufactured by Fukuda Metals, CuAtw-250), lubricant
- zinc stearate made by ADEKA, ZNS-730 was mixed to obtain a mixed powder.
- the mixing ratio is 0.8 parts by mass of graphite powder, 2 parts by mass of copper powder, and 0.75 parts by mass of lubricant with respect to 97.2 parts by mass of iron powder.
- Mixing was performed at 300 rpm for 4 minutes using a high-speed mixer having a stirring blade.
- the present inventors conceived of adjusting not only the average particle diameter D50 of the graphite powder proposed in Patent Document 6, but also D90.
- the graphite powder adjusted for D50 and D90 is mixed with the iron-based powder while applying a shearing force, so that the graphite powder can be rubbed into the recesses existing on the surface of the iron-based powder.
- the mold filling property can be improved, and the weight variation of the molded product can be reduced.
- the D50 of the graphite powder is set to 3.0 ⁇ m or less.
- D50 is preferably 2.7 ⁇ m or less, and more preferably 2.5 ⁇ m or less.
- the D50 of the graphite powder is small.
- the D50 of the graphite powder is set to 1.0 ⁇ m or more.
- the D50 of the graphite powder is preferably 1.1 ⁇ m or more, more preferably 1.6 ⁇ m or more. From the viewpoint of achieving all of the reduction in the variation in the weight of the molded body, the improvement of the mold filling property, and the improvement of the density of the molded body, the D50 of the graphite powder may be 1.6 ⁇ m or more and 2.7 ⁇ m or less. preferable. In addition, when D50 of graphite powder is less than 1.0 micrometer, it is thought that the reason for the density reduction of the compact is that the layered structure of graphite is broken by excessive grinding and the lubricity of graphite is impaired.
- the graphite powder of the present invention with D50 adjusted to the above range can be obtained by pulverizing commercially available natural graphite or artificial graphite, and an ordinary pulverizer may be used for pulverization.
- the atmosphere of pulverization is not particularly limited, and the pulverization atmosphere may be dry or pulverized wet.
- a normal pulverizer can be used, and examples thereof include a roll crusher, a cutter mill, a rotary crusher, a hammer crusher, a jet mill, a vibration mill, a pin mill, a wing mill, a ball mill, and a planetary mill.
- the pulverized graphite powder has a large specific surface area, and it is considered that a physical force such as static electricity acts as well as a chemical force. That is, it is considered that the finely pulverized graphite pulverized surface contains a lot of functional groups such as hydrogen groups, and intermolecular force is generated between the iron powder and the graphite powder via the functional groups, It is thought that adhesion between graphite powder and iron-based powder increases.
- the presence or absence of the functional group and the content thereof can be grasped to some extent by heating the graphite powder in a nitrogen atmosphere and measuring the weight change rate from room temperature to 950 ° C. The rate of temperature increase when the temperature is raised from room temperature to 950 ° C.
- the type of gas generated from the graphite powder differs for each heating temperature range, and the type of functional group removed in that temperature range can be estimated from the type of generated gas.
- a carboxyl group (—COOH) and a hydroxy group (—OH) are removed at 150 to 500 ° C.
- an oxo group ( ⁇ O) is removed at 500 to 900 ° C.
- a hydrogen group (—H) is removed at 900 ° C. and above. It is generally known.
- D90 of the graphite powder is preferably 9.5 ⁇ m or less, more preferably 9.0 ⁇ m or less, and particularly preferably 8.5 ⁇ m or less.
- the lower D90 of the graphite powder is preferable, but the lower limit is usually about 3.5 ⁇ m.
- airflow classification may be performed after pulverization by the above pulverizer.
- both D50 and D90 of graphite powder can be measured by a laser diffraction particle size distribution measuring device, D50 means a volume-based cumulative particle size equivalent to 50%, and D90 means a volume-based cumulative particle size equivalent to 90%. Means.
- the content of the graphite powder is usually 0.1 to 2.5 parts by mass with respect to 100 parts by mass of the total amount of the iron base powder, the graphite powder, and the strength improver described later.
- a blending ratio of 0.2 to 1.2 parts by mass is often used, and is preferably used within this range.
- the absence of a binder means that the density of the molded body when molded at the same molding pressure and the density of the sintered body obtained by sintering the molded body are higher than when the binder is added. There is also an effect that the strength of the bonded body is improved. Furthermore, the mixed powder of the present invention to which no binder is added can omit or simplify the dewaxing process performed between the molding process and the sintering process, contributing to improved productivity of sintered parts and environmental measures. To do.
- the mixing method giving shearing force is a method different from a convection mixing method represented by a V-type mixer or a double cone mixer, a mixing method using a vibration mill such as a vibro mill or an electromagnetic mill, or a ball mill.
- Mixing that gives a shearing force can be realized, for example, by using a mixer equipped with a stirring blade.
- the stirring blade is preferably one that moves so as to cut powder, and examples of the shape include a paddle, a turbine, a ribbon, a screw, a multistage blade, an anchor type, a horseshoe type, and a gate type.
- the container of the mixer may be a fixed type or a rotary type.
- the mixer provided with the stirring blade include a high speed mixer, a plow mixer, a nauter mixer, etc. manufactured by Henschel.
- the mixing time is generally 1 to 20 minutes, although it depends on the type of mixer used and the amount of mixed powder.
- the mixing of the graphite powder and the iron-based powder may be performed dry or wet.
- the mixing procedure of the graphite powder and the iron-based powder is not particularly limited, and these powders may be simultaneously mixed in a mixer, or one of the powders may be first charged in the mixer and the other powder. May be added later.
- the mixing of the graphite powder and the iron-based powder is not performed by heating to a temperature at which the lubricant or the like melts as in the so-called hot melt method, but may be performed at room temperature, for example.
- the atmosphere of mixing is not specifically limited, For example, it is in air
- the powder for powder metallurgy according to the present invention contains, in addition to graphite powder and iron-based powder, at least one of a lubricant and a physical property improver such as a strength improver, an abrasion resistance improver, and a machinability improver. You may contain. These may be added at the time of mixing the graphite powder and the iron-base powder, and the order of addition is not particularly limited.
- the graphite powder and the iron-base powder may be added to the mixer at the same time and mixed.
- the graphite powder and the iron-based powder are mixed in advance, and then the lubricant and the physical property improver are added to the mixer one by one or two or more while mixing, for example, by operating a stirring blade. May be.
- the lubricant examples include metal soap, alkylene bis fatty acid amide, fatty acid and the like, and these may be used alone or in combination of two or more.
- a fatty acid salt can be used.
- a fatty acid salt having 12 or more carbon atoms, particularly zinc stearate is preferably used.
- the alkylene bis fatty acid amide include C 2-6 alkylene bis C 12-24 carboxylic acid amide, and ethylene bisstearyl amide is preferably used.
- Examples of the fatty acids, for example, the R 1 hydrocarbon group, compounds exemplified in R 1 COOH can be used, preferably a carboxylic acid of about 16-22 carbon atoms, used in particular stearic acid, oleic acid preferably It is done.
- the content of the lubricant is, for example, 0.3 parts by mass or more and 1.5 parts by mass or less, more preferably 0.1 parts by mass or less with respect to 100 parts by mass of the total amount of iron-based powder, graphite powder, and strength improver. 5 parts by mass or more and 1.0 part by mass or less.
- the strength improver examples include powders containing at least one of copper, nickel, chromium, molybdenum, manganese, and silicon. Specifically, copper powder, nickel powder, chromium-containing powder, molybdenum powder, manganese-containing powder And silicon-containing powder.
- a strength improver may be used independently and may use 2 or more types together.
- the addition amount of the strength improver is, for example, 0.2 parts by mass or more and 5 parts by mass or less, more preferably 0.8 parts by mass with respect to 100 parts by mass of the total amount of the iron-based powder, the graphite powder, and the strength improver. 3 parts by mass or more and 3 parts by mass or less.
- wear resistance improver examples include hard particles such as carbide, silicide, and nitride, and these may be used alone or in combination of two or more.
- machinability improver examples include manganese sulfide, talc, calcium fluoride, and the like. These may be used alone or in combination of two or more.
- the iron-based powder used in the present invention may be either pure iron powder or iron alloy powder.
- the iron alloy powder may be a partial alloy powder in which, for example, an alloy powder such as copper, nickel, chromium, and molybdenum is diffusely adhered to the surface of the iron-based powder, and contains the same alloy components as the above alloy powder. It may be a pre-alloy powder obtained from molten iron or molten steel.
- the iron-based powder may be atomized iron powder obtained by atomizing molten iron or steel, or reduced iron powder obtained by reducing iron ore or mill scale. As the iron-based powder, an iron powder usually used for machine parts can be used.
- the average particle diameter D50 is 70 to 100 ⁇ m, and the maximum particle diameter is 250 ⁇ m or less, preferably 180 ⁇ m or less.
- An iron-based powder is preferred.
- the average particle size of the iron-based powder is the particle size of 50% of the cumulative sieving amount when the particle size distribution is measured according to Japan Powder Metallurgy Industry Standard JPMA P 02-1992 (metal powder sieving analysis test method). means.
- the mold filling property can be improved and the weight variation of the molded body can be reduced.
- the weight variation evaluated by the maximum value and the minimum value of the molded body weight when a plurality of molded bodies are molded using the mixed powder of the present invention can be 4% or less with respect to the target weight.
- the mixing ratio is 0.8 parts by mass of graphite powder, 2 parts by mass of copper powder, and 0.75 parts by mass of lubricant with respect to 97.2 parts by mass of iron powder.
- Mixing was performed at 300 rpm for 4 minutes using a high-speed mixer having a stirring blade. Using the obtained mixed powder, the following evaluations (1) to (3) were performed.
- FIG. 1 shows a base 1 that accommodates a cavity container 3, an air cylinder 5 that is fixed on the base on the other side of the cavity container 3, and a tip of a rod 4 of the air cylinder 5.
- This is a powder mold filling property evaluation apparatus composed of a powder supply box 2.
- the powder supply box 2 is a bottomless box, and reciprocates on the cavity container 3 by the operation of the air cylinder 5 with the upper surface of the base 1 being almost airtight.
- the cavity container 3 has a slit-like cavity having a width of several mm that is elongated in a direction perpendicular to the reciprocating direction of the powder supply box 2.
- FIG. 1A is a front view of the evaluation apparatus
- FIGS. 1B to 1D are cross-sectional views showing a state in which the powder supply box is moving.
- the measurement procedure is as follows. First, as shown in FIG. 1B, a predetermined amount of powder is charged into the powder supply box 2 with the rod 4 of the air cylinder 5 extended. Next, the rod 4 of the air cylinder 5 is shortened, and the powder supply box 2 is passed over the slit-shaped cavity of the cavity container 3 at a predetermined speed. By this passage, the powder in the powder supply box 2 falls into the cavity container 3 as shown in FIG. Then, as shown in FIG. 1 (d), the powder is filled into the cavity container 3 after passing through the powder supply box 2.
- the size of the powder supply box 2 is 80 ⁇ 80 ⁇ 70 mm
- the size of the cavity container 3 is 80 ⁇ 60 ⁇ 55 mm
- the slit size is 2 ⁇ 60 mm
- the shoe speed that is, the passing speed of the powder supply box 2 is 100 mm / s.
- the amount of powder (mg) filled for each test was divided by 120 mm 2 which is the area of the slit-shaped cavity, and the average value of these values was determined for each No. 1 test. Mold filling property (mg / mm 2 ).
- Atmel 300M, 300NH, or 250M which are iron-based powders used, are as shown in Tables 2 and 3.
- the apparent density described in Tables 2 and 3 is the method specified in JIS Z2504 (metal powder-apparent density test method), and the fluidity is a method specified in JIS Z2502 (fluidity test method for metal powder). It is the result measured by.
- 300NH has a large apparent density and 250M has a small apparent density. That is, based on the Atmel 300M, 300NH has less irregularities on the surface of the iron powder and has a lower irregularity, and 250M has more irregularities and a higher irregularity.
- the apparent density of 250M is substantially equivalent to the apparent density of the reduced iron powder.
- Tables 4 to 6 The results of the above (1) to (3) are shown in Tables 4 to 6.
- Atmel 300M (average particle size: about 70 ⁇ m) is used as the iron-based powder.
- Atmel 300NH (apparent density is 3.10 g / cm 3 , average particle size: about 90 ⁇ m).
- Atmel 250M (apparent density was 2.42 g / cm 3 , average particle size: about 85 ⁇ m) was used.
- FIG. 2 is a scanning electron micrograph obtained by observing 2-3. It can be seen from FIG. 2 that the graphite powder is gathered in the recesses of the iron powder. Also, FIG. 3-3 is a scanning electron micrograph observing 3-3, and in FIG. 3, it was observed that graphite powder was gathered and existed in the recesses.
- a molded object density is influenced also by the shape of an iron-based powder, it is appropriate to evaluate a molded object density for every kind of iron-based powder. That is, no. No. 1-17 is No.1. Compared with Nos. 1-9, 1-11, 1-12, and 1-14 to 1-16, the molded body density is smaller. 2-5, No. 2 Compared with 2-3 and 2-4, the compact density is small. 3-5 is No.3. It can be evaluated that the compact density is smaller than that of 3-3 and 3-4.
- the present invention it is possible to stabilize quality by minimizing dimensional change by miniaturizing graphite powder and to realize energy saving and cost saving in the production of sintered parts such as reduction of sintering temperature and shortening of sintering time.
- the mixed powder of the present invention can be applied to sintered parts for machine structures and the like, and particularly applicable to complicated and thin-walled parts. And since it can be reduced in weight, it is suitable also for a high-strength material.
- Base 2 Powder supply box 3: Cavity container 4: Rod 5: Air cylinder
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
得られた混合粉末を用い、機械式粉末成形プレスで、目標重量51g、外径30mm、内径10mmのリング状試験片を300個連続成形し、得られた成形体の重量ばらつきを評価した。重量ばらつきは、300個の成形体のうち、最大の重量と最小の重量の差R(g)で評価した。 (1) Measurement of weight variation of molded body Using the obtained mixed powder, 300 ring-shaped test pieces having a target weight of 51 g, an outer diameter of 30 mm, and an inner diameter of 10 mm were continuously molded using a mechanical powder molding press. The weight variation of the molded body was evaluated. The weight variation was evaluated by the difference R (g) between the maximum weight and the minimum weight among the 300 molded bodies.
金型充填性は図1に示す評価装置を用いて評価した。図1は、キャビティ容器3を収容する基台1と、キャビティ容器3とは他方側の基台上に固定して設けられたエアシリンダ5と、エアシリンダ5のロッド4の先端に取り付けられた粉末供給箱2から構成される、粉末の金型充填性評価装置である。粉末供給箱2は、無底の箱であり、基台1の上面をほぼ気密状態で、上記エアシリンダ5の作動により、上記キャビティ容器3上を往復運動する。また、キャビティ容器3は、粉末供給箱2の往復移動方向と直交する方向に細長く形成された幅数mmのスリット状キャビティを有する。図1(a)は該評価装置の正面図であり、(b)~(d)は粉末供給箱の移動中の状態を表す断面図である。 (2) Measurement of mold filling property The mold filling property was evaluated using the evaluation apparatus shown in FIG. FIG. 1 shows a
得られた混合粉末を、所定の金型に投入して490MPa及び686MPaのプレス圧で成形して、φ11.28mmのタブレット状試験片を作製し、得られた成形体密度を測定した。 (3) Measurement of molded body density The obtained mixed powder was put into a predetermined mold and molded at a press pressure of 490 MPa and 686 MPa to produce a tablet-shaped test piece of φ11.28 mm, and the obtained molding Body density was measured.
2:粉末供給箱
3:キャビティ容器
4:ロッド
5:エアシリンダ 1: Base 2: Powder supply box 3: Cavity container 4: Rod 5: Air cylinder
Claims (4)
- 平均粒径D50が1.0μm以上、3.0μm以下であり、D90が10μm以下である黒鉛粉末を、
バインダーを添加することなく、
せん断力を与えながら鉄基粉末と混合することによって得られることを特徴とする粉末冶金用混合粉末。 A graphite powder having an average particle diameter D50 of 1.0 μm or more and 3.0 μm or less and D90 of 10 μm or less,
Without adding binder
A mixed powder for powder metallurgy obtained by mixing with an iron-based powder while applying a shearing force. - 鉄基粉末と、
前記鉄基粉末の凹部に集まって存在する黒鉛粉末とを含むことを特徴とする粉末冶金用混合粉末。 Iron-based powder,
A mixed powder for powder metallurgy, characterized by comprising graphite powder that collects and exists in the recesses of the iron-based powder. - 前記黒鉛粉末の平均粒径D50が、1.6μm以上、2.7μm以下である請求項1に記載の粉末冶金用混合粉末。 The mixed powder for powder metallurgy according to claim 1, wherein an average particle diameter D50 of the graphite powder is 1.6 µm or more and 2.7 µm or less.
- 前記鉄基粉末が、アトマイズ鉄粉または還元鉄粉である請求項1~3のいずれかに記載の粉末冶金用混合粉末。
The mixed powder for powder metallurgy according to any one of claims 1 to 3, wherein the iron-based powder is atomized iron powder or reduced iron powder.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1651450A SE541766C2 (en) | 2014-05-29 | 2015-05-14 | Mixed powder for powder metallurgy |
US15/309,947 US20170266723A1 (en) | 2014-05-29 | 2015-05-14 | Mixed powder for powder metallurgy |
KR1020167036059A KR20170010829A (en) | 2014-05-29 | 2015-05-14 | Mixed powder for powder metallurgy |
CN201580022712.6A CN106255563B (en) | 2014-05-29 | 2015-05-14 | Mixed powder for powder metallurgy |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014111418A JP6262078B2 (en) | 2014-05-29 | 2014-05-29 | Mixed powder for powder metallurgy |
JP2014-111418 | 2014-05-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015182398A1 true WO2015182398A1 (en) | 2015-12-03 |
Family
ID=54698735
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/063889 WO2015182398A1 (en) | 2014-05-29 | 2015-05-14 | Mixed powder for powder metallurgy |
Country Status (6)
Country | Link |
---|---|
US (1) | US20170266723A1 (en) |
JP (1) | JP6262078B2 (en) |
KR (1) | KR20170010829A (en) |
CN (1) | CN106255563B (en) |
SE (1) | SE541766C2 (en) |
WO (1) | WO2015182398A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6648779B2 (en) * | 2017-06-16 | 2020-02-14 | Jfeスチール株式会社 | Powder mixture for powder metallurgy and method for producing the same |
KR102660345B1 (en) * | 2018-12-28 | 2024-04-23 | 현대자동차주식회사 | Iron-based powder for powder metallurgy and method for producing same |
US11992880B1 (en) * | 2019-07-22 | 2024-05-28 | Keystone Powdered Metal Company | Acoustical dampening powder metal parts |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5256060A (en) * | 1975-11-04 | 1977-05-09 | Nippon Kokuen Kogyo Kk | Method to manufacture ferroussgraphite composite powder for powder metallurgy |
JP2004190051A (en) * | 2002-12-06 | 2004-07-08 | Jfe Steel Kk | Iron based powdery mixture for power metallurgy, and production method therefor |
JP2012102355A (en) * | 2010-11-09 | 2012-05-31 | Kobe Steel Ltd | Mixed powder for powder metallurgy |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE438275B (en) | 1983-09-09 | 1985-04-15 | Hoeganaes Ab | MIX-FREE IRON-BASED POWDER MIX |
JPH01219101A (en) | 1988-02-25 | 1989-09-01 | Kobe Steel Ltd | Iron powder for powder metallurgy and production thereof |
JP2898461B2 (en) | 1991-04-22 | 1999-06-02 | 株式会社神戸製鋼所 | Mixed powder and binder for powder metallurgy |
JP2778410B2 (en) | 1992-06-04 | 1998-07-23 | 株式会社神戸製鋼所 | Anti-segregation mixed powder for powder metallurgy |
JPH07173503A (en) | 1993-11-04 | 1995-07-11 | Kobe Steel Ltd | Binder for powder metallurgy and powdery mixture for powder metallurgy |
US20030219617A1 (en) * | 2002-05-21 | 2003-11-27 | Jfe Steel Corporation, A Corporation Of Japan | Powder additive for powder metallurgy, iron-based powder mixture for powder metallurgy, and method for manufacturing the same |
JP2004218041A (en) * | 2003-01-17 | 2004-08-05 | Jfe Steel Kk | Sintered member, and production method therefor |
US20090041608A1 (en) * | 2006-02-15 | 2009-02-12 | Jfe Steel Corporation A Corporation Of Japan | Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body |
US8589732B2 (en) * | 2010-10-25 | 2013-11-19 | Microsoft Corporation | Consistent messaging with replication |
JP5617529B2 (en) * | 2010-10-28 | 2014-11-05 | Jfeスチール株式会社 | Iron-based mixed powder for powder metallurgy |
-
2014
- 2014-05-29 JP JP2014111418A patent/JP6262078B2/en active Active
-
2015
- 2015-05-14 CN CN201580022712.6A patent/CN106255563B/en active Active
- 2015-05-14 SE SE1651450A patent/SE541766C2/en unknown
- 2015-05-14 US US15/309,947 patent/US20170266723A1/en not_active Abandoned
- 2015-05-14 KR KR1020167036059A patent/KR20170010829A/en active Search and Examination
- 2015-05-14 WO PCT/JP2015/063889 patent/WO2015182398A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5256060A (en) * | 1975-11-04 | 1977-05-09 | Nippon Kokuen Kogyo Kk | Method to manufacture ferroussgraphite composite powder for powder metallurgy |
JP2004190051A (en) * | 2002-12-06 | 2004-07-08 | Jfe Steel Kk | Iron based powdery mixture for power metallurgy, and production method therefor |
JP2012102355A (en) * | 2010-11-09 | 2012-05-31 | Kobe Steel Ltd | Mixed powder for powder metallurgy |
Also Published As
Publication number | Publication date |
---|---|
CN106255563B (en) | 2018-12-21 |
JP6262078B2 (en) | 2018-01-17 |
US20170266723A1 (en) | 2017-09-21 |
SE541766C2 (en) | 2019-12-10 |
SE1651450A1 (en) | 2016-11-03 |
CN106255563A (en) | 2016-12-21 |
JP2015224379A (en) | 2015-12-14 |
KR20170010829A (en) | 2017-02-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5552031B2 (en) | Mixed powder for powder metallurgy | |
JP4379535B1 (en) | Iron-base powder for powder metallurgy and method for improving fluidity thereof | |
TWI392747B (en) | Iron powder for powder metallurgy and powder sintered body | |
US8992659B2 (en) | Metal powder composition | |
CA2632411C (en) | Lubricant for powder metallurgical compositions | |
WO2009075042A1 (en) | Iron based powder for powder metallurgy | |
CN107835864B (en) | The manufacturing method of iron-based powder for powder metallurgy and iron-based powder for powder metallurgy | |
WO2015182398A1 (en) | Mixed powder for powder metallurgy | |
WO2007119346A1 (en) | Mixed powder for powder metallurgy, green compact thereof and sintered compact | |
WO2010150920A1 (en) | Iron-based mixed powder for powder metallurgy | |
JP2012052167A (en) | Iron-based mixed powder for sintering and iron-based sintered alloy | |
WO2020196401A1 (en) | Lubricant, powdered mixture, and method for producing sintered body | |
CN107614159A (en) | Ferrous based powder metallurgical mixed powder and its manufacture method and the sintered body using its making | |
WO2022260009A1 (en) | Lubricant, combination of lubricants, powder mixture, combination of raw materials for powder mixture and production method for sintered body | |
WO2022259548A1 (en) | Combination of lubricants, powder mixture, combination of raw materials for powder mixture and production method for sintered body | |
JP2020132973A (en) | Iron-based powder metallurgy mixed powder, iron-based sintered alloy, and sintered machine component | |
WO2019146310A1 (en) | Mixed powder for powder metallurgy |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15798932 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15309947 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: IDP00201608852 Country of ref document: ID |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020167036059 Country of ref document: KR |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15798932 Country of ref document: EP Kind code of ref document: A1 |