WO2018181107A1 - Matériau d'alliage d'aluminium fritté et son procédé de production - Google Patents

Matériau d'alliage d'aluminium fritté et son procédé de production Download PDF

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Publication number
WO2018181107A1
WO2018181107A1 PCT/JP2018/011997 JP2018011997W WO2018181107A1 WO 2018181107 A1 WO2018181107 A1 WO 2018181107A1 JP 2018011997 W JP2018011997 W JP 2018011997W WO 2018181107 A1 WO2018181107 A1 WO 2018181107A1
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WO
WIPO (PCT)
Prior art keywords
powder
aluminum alloy
sintered
green compact
alloy material
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Application number
PCT/JP2018/011997
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English (en)
Japanese (ja)
Inventor
安田　健
大平　晃也
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Ntn株式会社
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Publication of WO2018181107A1 publication Critical patent/WO2018181107A1/fr

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    • 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
    • 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
    • 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
    • B22F3/10—Sintering only
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent

Definitions

  • the present invention relates to a sintered aluminum alloy material and a manufacturing method thereof.
  • Typical lightweight metal materials include aluminum and magnesium.
  • Aluminum and magnesium are alloyed with other metals to improve properties such as strength, toughness, corrosion resistance, and workability, and are mainly used for the above-mentioned applications.
  • aluminum alloys are suitably used for machine parts because of their good formability. This aluminum alloy is mostly manufactured by stretching and casting, but is also mass-produced by a powder metallurgy method that solidifies rapidly solidified powder obtained by a gas atomization method.
  • Powder metallurgy methods include a hot extrusion method, a powder forging method, and a sintering method.
  • the sintering method has an advantage that it can be formed into a net shape or a near net shape at a low cost. Therefore, it is suitable for mass production of machine parts.
  • Patent Document 1 warm molding is used together with mold lubrication when molding a green compact. This makes it possible to form a high-density green compact while preventing the powder from adhering to the mold.
  • Patent Document 2 a nitrogen compound is generated on the powder surface by heat-treating an aluminum alloy powder compact containing magnesium in a nitrogen atmosphere to which a reducing gas component is added. This nitrogen compound promotes sintering.
  • Patent Document 1 uses warm forming, it is less economical than cold forming.
  • the powder hardness is lowered by pre-annealing the powder at 250 to 450 ° C. in order to increase the density of the green compact.
  • the powder hardness cannot be lowered as compared with pure aluminum powder. Therefore, it is insufficient for densification of the green compact.
  • the introduction of reducing gas requires special atmosphere management, which leads to higher costs, which is problematic in terms of mass productivity.
  • this sintered material is formed by compacting a raw powder containing aluminum alloy powder containing 1 to 30% by weight of magnesium and pure aluminum powder to form a green compact, and sintering the green compact. Characterized by the fact that the proportion of pure aluminum powder in the raw material powder is set to 70 to 95% by weight and the proportion of aluminum alloy powder to 5 to 30% by weight, respectively. It is done.
  • magnesium contained in the green compact diffuses into the sintered aluminum alloy material in the sintering process and becomes highly concentrated in the surface layer portion.
  • magnesium has a lower free energy of formation of oxide than aluminum and forms an oxide film of magnesium.
  • the aluminum oxide film is reduced at the surface layer portion of the green compact, thereby causing a strong necking bond, resulting in a result. It is speculated that a high-strength sintered body can be obtained.
  • the present invention has been made on the basis of the above knowledge, and decided to compress and sinter a raw material powder containing an aluminum alloy powder containing 1 to 30% by weight of magnesium and a pure aluminum powder. Thereby, a strong necking bond can be produced
  • the ratio of pure aluminum powder to the raw material powder is set to 70 to 95% by weight, and the ratio of aluminum alloy powder to 5 to 30% by weight, respectively. If it is small, the green compact is deformed during heat treatment (sintering), and in some cases, there is an increased risk of cracking. Moreover, it is because it becomes difficult to generate
  • the magnesium concentration in a region within 0.3 mm from the surface may be higher than the magnesium concentration in a region deeper than 0.3 mm from the surface.
  • the magnesium oxide film is highly concentrated, so that the oxide film of aluminum is sufficiently reduced. Therefore, it is possible to generate a stronger necking bond and to further increase the strength of the sintered body.
  • the relative density may be 90% or more by weight.
  • the relative density referred to here is obtained by dividing the density of the sintered aluminum alloy material measured according to the Archimedes method in accordance with JIS Z 2501: 2000 by the true density of the raw material powder of the sintered aluminum alloy material. It shall refer to the value obtained.
  • the sintered aluminum alloy material of the present invention by containing pure aluminum powder, it is possible to form a very dense green compact while containing the aluminum alloy powder. Therefore, by setting the relative density of the sintered aluminum alloy material to 90% or more by weight, the mechanical strength of the green compact itself that becomes the base of the sintered body can be ensured. Therefore, it is possible to sufficiently and stably develop the high strength of the sintered body.
  • the crushing strength may be 120 MPa or more.
  • the crushing strength here refers to the crushing strength evaluated according to JIS Z 2507 “Sintered bearing—crushing strength test method”.
  • a very high strength sintered body can be obtained by strong necking bonding. Therefore, by setting the crushing strength to 120 MPa or more, it is possible to exhibit the mechanical strength of a level required as a machine part.
  • this manufacturing method includes a mixing step in which an aluminum alloy powder containing 1 to 30% by weight of magnesium and a pure aluminum powder are mixed to produce a raw material powder containing the aluminum alloy powder and the pure aluminum powder;
  • a method for producing a sintered aluminum alloy material comprising a green compacting step of forming a green compact by compression molding, and a sintering step of obtaining a sintered body by sintering the green compact, It is characterized in that the aluminum alloy powder and the pure aluminum powder are mixed so that the proportion of the pure aluminum powder in the raw material powder is 70 to 95% by weight and the proportion of the aluminum alloy powder is 5 to 30% by weight in the mixing step. Attached.
  • the raw material powder containing magnesium alloy powder containing 1 to 30% by weight of magnesium and pure aluminum powder it is strong like the sintered aluminum alloy material according to the present invention.
  • a high-strength sintered body can be obtained by generating a simple necking bond.
  • the green compact can be molded at a high density even in the case of cold molding.
  • this sintered body sintered aluminum alloy material
  • this sintered body can be manufactured without performing processing that leads to cost increase such as warm forming or introduction of reducing gas, the manufacturing cost can be reduced. This enables mass production.
  • the green compact may be formed from the raw material powder by cold forming in the green compact forming step.
  • the sintered aluminum alloy material of the present invention by containing pure aluminum powder, it is possible to form a very dense green compact while containing the aluminum alloy powder. Therefore, even when the green compact is formed from the raw material powder by cold forming, a very dense green compact can be stably formed.
  • the green compact may be sintered at a maximum temperature of 560 to 640 ° C. in the sintering step.
  • the maximum temperature is set in the range of 560 to 640 ° C., and the details will be shown in the experimental results to be described later. Bonding) is promoted, and a strong sintered body can be stably produced.
  • the green compact may be sintered in a nitrogen atmosphere in the sintering step.
  • Aluminum tends to generate oxides more easily than other metals. Therefore, by sintering in a nitrogen atmosphere, the generation of oxide can be suppressed and the progress of sintering can be promoted. Therefore, the strength of the sintered body can be improved.
  • a dense green compact can be formed, and a high-strength sintered aluminum alloy material can be manufactured at low cost.
  • the pure aluminum powder according to the present invention it is possible to use a high-purity aluminum metal manufactured by the gas atomization method.
  • Pure aluminum powder may contain inevitable impurities.
  • the particle size distribution of the pure aluminum powder is not particularly limited, but is preferably a fine powder capable of forming a dense green compact. The average particle size is 100 ⁇ m or less.
  • the production method is not limited to the gas atomization method, and various powder methods such as a centrifugal atomization method, a known powder production technique such as a mechanical alloying method and a reduction method can be applied.
  • the aluminum alloy powder according to the present invention can have any alloy composition as long as it contains 1 to 30% by weight of magnesium.
  • a molten metal prepared to have a predetermined alloy composition and manufactured by a gas atomizing method can be used. Since magnesium easily burns, it is preferable to prepare the composition within a range not exceeding 30% by weight.
  • a metal other than magnesium may be added to the alloy composition as long as the effects of the present invention are not impaired.
  • a lubricant may be blended for the purpose of preventing adhesion to the mold when the green compact is formed. This type of lubricant may be added to the alloy composition, or may be added to a mixed powder of pure aluminum powder and aluminum alloy powder described later.
  • the particle size distribution of the aluminum alloy powder is not particularly limited, but is preferably a fine powder capable of forming a dense green compact.
  • the average particle size is preferably 100 ⁇ m or less.
  • the production method is not limited to the gas atomization method, and it is possible to apply known powder production techniques such as mechanical alloying method and reduction method, including various atomization methods such as centrifugal atomization method. It is.
  • Pure aluminum powder and aluminum alloy powder can be mixed by a known mixing method to obtain a raw material powder according to the present invention (mixing step).
  • Specific examples of the mixing method include a V-type mixer and a double cone type mixer.
  • a green compact is formed by cold forming using a press die (compact forming process).
  • a lubricant may be applied to the surface of the press mold to be used.
  • the molding pressure is set, for example, to 400 to 800 MPa, preferably 550 to 650 MPa. If the molding pressure is too high (for example, 800 MPa or more), the mass productivity is poor from the viewpoint of the mold life. Therefore, the molding pressure is preferably set to less than 800 MPa in consideration of mass productivity.
  • the formed green compact is sintered, for example, by heat treatment in a nitrogen atmosphere (sintering process).
  • a heat treatment furnace a batch type furnace is preferable, and the green compact is heated in a state where the inside of the furnace is sufficiently replaced with nitrogen.
  • the flow rate of nitrogen is preferably 1 L / min or more.
  • the temperature pattern in the main sintering process is arbitrary in principle, but, for example, one having a temperature increase and a heat retention in one stage or two stages or more is used.
  • the temperature T1 and the holding time t1 are the temperature and holding time at which the lubricant adhering to the surface of the green compact can be degreased. (For example, 380 to 420 ° C., 50 to 70 min).
  • the temperature T2 and the holding time t2 are set to a temperature and holding time suitable for sintering of the green compact (preferably 560 to 640 ° C., holding time 30 min or more, Preferably, the temperature is set to 580 to 620 ° C. and the holding time is 60 minutes or more.
  • the temperature T2 here corresponds to the maximum temperature during sintering.
  • the sintering temperature is lower than 560 ° C. at the maximum temperature, the sintering action is not sufficiently generated, and if it is higher than 640 ° C., there is a possibility that deformation that cannot be ignored occurs in the sintered body.
  • the maximum temperature during sintering is not limited to a nitrogen atmosphere, and may be performed in other atmospheres as long as various conditions are satisfied.
  • the density of the obtained sintered aluminum alloy material is measured in accordance with, for example, the Archimedes method according to JIS Z 2501: 2000. Then, the relative density is calculated by dividing the density measured by the Archimedes method by the true density.
  • the crushing strength of the obtained sintered aluminum alloy material is measured in accordance with, for example, a test method based on JIS Z 2507: 2000.
  • the sintered aluminum alloy material according to the present invention is obtained by compression-molding and sintering an aluminum alloy powder containing 1 to 30% by weight of magnesium and a pure aluminum powder. It is possible to generate a strong necking bond and increase the strength of the sintered body. Further, by allowing pure magnesium powder to be contained, the green compact can be molded at a high density even in the case of cold molding. In addition, since this sintered body (sintered aluminum alloy material) can be manufactured without performing processing that leads to cost increase such as warm forming or introduction of reducing gas, the manufacturing cost can be reduced. This enables mass production.
  • the maximum temperature (that is, the sintering temperature) is set in the range of 560 to 640 ° C., and the sintering (necking bonding) is sufficiently promoted without causing deformation.
  • the sintering necking bonding
  • the sintered aluminum alloy material and its manufacturing method which concern on this invention are not limited to the form of the said illustration, It can take arbitrary forms within the scope of the present invention. Of course.
  • Example 1 In each of Examples (Examples 1 to 10) and Comparative Examples (Comparative Examples 1 to 9), pure aluminum powder and any one of the aluminum alloy powders (alloy powders 1 to 3) shown in Table 1 were mixed in a V shape.
  • the powder mixed by the machine was used as the raw material powder.
  • all of the alloy powders 1 to 3 are produced by a gas atomizing method.
  • the raw material powder having the above composition was formed into a predetermined cylindrical shape by cold forming. More specifically, a fatty acid amide-based lubricant was applied to the molding die, and compacting was performed in the mold lubrication state. After pressing at a molding pressure of 620 MPa and a holding time of 5 seconds, a green compact having an inner diameter of 8 mm, an outer diameter of 16 mm, and an axial dimension of 5 mm was obtained by taking out the green compact from the molding die.
  • the density was measured in accordance with the Archimedes method based on JIS Z 2501: 2000. Furthermore, the crushing strength of the sintered body was measured in accordance with a test method based on JIS Z 2507: 2000.
  • the crushing strength was measured for only Comparative Example 1 and Comparative Example 3 in which the compacting and sintering processes could be performed without deformation or cracking. The results are shown in Tables 2 to 4. In each table, the value of the crushing strength in parentheses indicates the stress value when the strain amount is 1 mm when the fracture amount is not broken until the strain amount reaches 5 mm.
  • the sintered aluminum alloy material according to the present invention is dense and has high strength, for example, machine parts having sliding parts (sliding parts) and machine parts for various applications. Widely applicable to.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

Cette invention concerne un matériau d'alliage d'aluminium fritté obtenu par moulage par compression d'une poudre de matériau de départ, qui contient une poudre d'aluminium pur et une poudre d'alliage d'aluminium qui contient de 1 à 30 % en poids de magnésium, en un comprimé de poudre et par frittage subséquent du comprimé de poudre. Les proportions de la poudre d'aluminium pur et de la poudre d'alliage d'aluminium dans la poudre de matériau de départ sont établies à 70-95 % en poids et 5-30 % en poids, respectivement.
PCT/JP2018/011997 2017-03-29 2018-03-26 Matériau d'alliage d'aluminium fritté et son procédé de production WO2018181107A1 (fr)

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JP2017-065456 2017-03-29
JP2017065456A JP2018168403A (ja) 2017-03-29 2017-03-29 焼結アルミニウム合金材およびその製造方法

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WO2018181107A1 true WO2018181107A1 (fr) 2018-10-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115044793A (zh) * 2022-06-16 2022-09-13 江苏精研科技股份有限公司 一种采用粉末注射成形制备两相高熵合金制作方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04202601A (ja) * 1990-11-30 1992-07-23 Showa Denko Kk Ａｌ合金混合粉末およびＡｌ合金焼結体の製造方法
JP2012505312A (ja) * 2008-10-10 2012-03-01 ジーケーエヌ シンター メタルズ、エル・エル・シー アルミニウム合金粉末金属の混合体
JP2015004098A (ja) * 2013-06-20 2015-01-08 株式会社豊田中央研究所 鉄基焼結材およびその製造方法
JP2015068185A (ja) * 2013-09-27 2015-04-13 住友電工焼結合金株式会社 オイルポンプ用ロータ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04202601A (ja) * 1990-11-30 1992-07-23 Showa Denko Kk Ａｌ合金混合粉末およびＡｌ合金焼結体の製造方法
JP2012505312A (ja) * 2008-10-10 2012-03-01 ジーケーエヌ シンター メタルズ、エル・エル・シー アルミニウム合金粉末金属の混合体
JP2015004098A (ja) * 2013-06-20 2015-01-08 株式会社豊田中央研究所 鉄基焼結材およびその製造方法
JP2015068185A (ja) * 2013-09-27 2015-04-13 住友電工焼結合金株式会社 オイルポンプ用ロータ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115044793A (zh) * 2022-06-16 2022-09-13 江苏精研科技股份有限公司 一种采用粉末注射成形制备两相高熵合金制作方法
CN115044793B (zh) * 2022-06-16 2023-09-08 江苏精研科技股份有限公司 一种采用粉末注射成形制备两相高熵合金制作方法

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