CN108220835A - Lightweight metal polyporous material intensifying method based on single diameter high duty metal ball - Google Patents
Lightweight metal polyporous material intensifying method based on single diameter high duty metal ball Download PDFInfo
- Publication number
- CN108220835A CN108220835A CN201711273123.2A CN201711273123A CN108220835A CN 108220835 A CN108220835 A CN 108220835A CN 201711273123 A CN201711273123 A CN 201711273123A CN 108220835 A CN108220835 A CN 108220835A
- Authority
- CN
- China
- Prior art keywords
- metal
- polyporous material
- high duty
- metal ball
- metal polyporous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- 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
- B22F3/11—Making porous workpieces or articles
- B22F3/1103—Making porous workpieces or articles with particular physical characteristics
- B22F3/1118—Making porous workpieces or articles with particular physical characteristics comprising internal reinforcements
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of lightweight metal polyporous material intensifying methods based on single diameter high duty metal ball, utilize the inside and outside space of high duty metal ball filling metal polyporous material of single diameter, by squeezing metal ball, metal polyporous material is made locally to receive extruding, and then metal polyporous material tissue is made more to refine and fine and close, so as to promote its mechanical property.
Description
Technical field
The invention belongs to materials science field, in particular to the lightweight metal based on single diameter high duty metal ball is more
Porous materials intensifying method.
Background technology
Porous media plays irreplaceable function in nature animal and plant body.Many natural structure materials are inherently
It is porosu solid, such as timber, bone and coral, dead load and fatigue load can be born for a long time.In aerospace, ship
The industrial circles such as oceangoing ship, automobile, high intensity, low weight material be always engineers and technicians' focus of attention.Occur in recent years
Artificial metal porous material also there is very high porosity, while there is high specific strength, high specific stiffness, high tough, shock resistance
Etc. excellent mechanical property, in addition to this also there is the characteristic of multifunctional unit, such as shield electromagnetic radiation, damping and heat-insulation noise-reduction
Etc..
Metal polyporous material can be divided into unordered and orderly two major class by the regular degree of its micro-structure, the former mainly includes bubble
Foam material, the latter refer mainly to lattice material, i.e., the space truss structure that rod piece is formed by certain regular repeated arrangement.It is but logical at present
Metal polyporous material prepared by model casting or 3D printing is crossed, mostly not fine and close there are tissue, the problem of performance is undesirable.
To solve the above problems, at present the reinforcing means of metal polyporous material have it is following several：(1) material composition is adjusted：
Matrix material ingredients are adjusted, that is, adds intensified element and plays the role of solid solution or second-phase strength.Addition alterant plays refinement
The effect of tissue；(2) change porous structure, such as the adjustment voidage of foam metal material and bar diameter, optimize metal porous material
The lattice structure of material：Bar diameter, bar length, angle etc.；(3) later stage reinforcing is carried out by hot isostatic pressing, it is (general to eliminate internal flaw
For hole).
For the schedule of reinforcement of (1) and (2), can only be carried out before prepared by metal polyporous material, when metal polyporous material quilt
After preparing, then the reinforcing means of metal polyporous material cannot be re-used as.Mode (3) can to prepare molding metal material into
Row is strengthened, but hot isostatic apparatus is expensive, and generally more than million.Hip treatment technique is also complex simultaneously.
Above-mentioned 2 points limit its application.
Invention content
The goal of the invention of the present invention be overcome in the prior art for the metal polyporous material tissue prepared it is not fine and close,
The problem of performance is undesirable, and hip treatment equipment is expensive, complex process, and provide a kind of based on the high-strength of single diameter
The intensifying method of the lightweight metal polyporous material of metal ball is spent, so as to improve its material property.
To achieve the above object, the technical scheme is that the high duty metal ball filling metal using single diameter is more
The inside and outside space of Porous materials squeezes metal ball by mold, metal polyporous material is made locally to be squeezed, and then make metal
Porous material tissue more refines and densification.
Specifically include following steps：
(1) using metal polyporous material, wherein aperture >=1.5mm, bar diameter >=0.5mm, meanwhile, the ratio of aperture and bar diameter
≥3；
(2) metal polyporous material is put into compression mould, the inner wall of compression mould and the distance of metal polyporous material are big
In equal to 1.5 times of metal polyporous material bar diameter；
(3) the high duty metal ball of single diameter is filled while swing die, wherein high duty metal ball hardness is
The 2 times or more of metal polyporous material hardness, 0.5~1.5 times of a diameter of metal polyporous material bar diameter of high duty metal ball, gold
Must be surrounded on the surrounding of genus polyporus material especially compression direction by high duty metal ball, ensure metal polyporous material not with
Compression mould and pressure head are in direct contact；
(4) using with the matched pressure head of compression mould, the distance between pressure head and mold is less than high duty metal bulb diameter
0.5 times so that gap that high duty metal ball will not be between compression mould and pressure head overflow；
(5) it is compressed downwards with the speed of 0.1~0.5mm/s, it is metal porous to make the compressive strength in compression mould
0.1~0.5 times of the matrix used Yield Strength of Metals of material, the compressive strength are the cross-sectional area in pressure/mold, and
Pressurize 10 seconds~30 seconds, makes high duty metal ball be filled into the inner space of metal polyporous material；
(6) it is compressed downwards with the speed of 0.1~3mm/s, the compressive strength in compression mould is more than metal porous material
Expect the yield strength of matrix used metal material, pressurize 30 seconds~60 seconds, wherein compressive strength are the cross section in pressure/mold
Product；
(7) unloading pressure loosens metal polyporous material of the taking-up Jing Guo intensive treatment after high duty metal ball.
Further setting is to repeat (2)~(7) step 1 to 3 times.
The present invention proposes a kind of schedule of reinforcement of innovation：Using high duty metal ball filling metal polyporous material inside and
Exterior space by squeezing metal ball, makes metal polyporous material locally receive extruding, and then make metal polyporous material tissue more
Refinement and densification, so as to promote its mechanical property.
It is an advantage of the invention that：
(1) common press and mold are used, equipment cost is low, and relative to millions of hot isostatic apparatus, the present invention is more
Promotion and application is added to be worth.
(2) it is simple for process, safe operation.Relative to the high temperature and pressure of hip treatment, the present invention is only by extruding
High duty metal ball can be such that metal polyporous material tissue more refines and fine and close.
(4) high duty metal ball can Reusability, reduce cost.
(5) strengthen effect protrude, can be promoted 1.5~2 times of metal polyporous material yield strength in addition more than.
(6) since metal polyporous material is surrounded by high duty metal ball, when squeezing, macro-size variation is little.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These attached drawings obtain other attached drawings and still fall within scope of the invention.
Fig. 1 places the schematic diagram of metal polyporous material in mold；
Fig. 2 fills the schematic diagram of high duty metal ball；
Fig. 3 continues to fill up high duty metal ball to the schematic diagram for surrounding metal polyporous material in mold；
Fig. 4 pressure heads are pressed down against the schematic diagram of high duty metal ball；
Fig. 5 embodiment of the present invention 1 squeeze it is primary after fine aluminium porous material electron scanning micrograph；
1 original sample of Fig. 6 embodiment of the present invention squeezes fine aluminium porous material Compressive Mechanical Properties primary, after extruding three times
Curve.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
The reinforcing of 1 fine aluminium porous material of embodiment
As shown in Figures 1 to 6, in the embodiment of the present invention 1, to include the following steps：
(1) using fine aluminium porous material, wherein aperture 6mm, bar diameter 2mm, the ratio of aperture and bar diameter is equal to 3.Preparation side
Method is model casting, and the yield strength for casting fine aluminium is about 30Mpa.
(2) fine aluminium porous material is put into compression mould, the distance of the inner wall and fine aluminium porous material of compression mould is
4mm, referring to Fig. 1；
(3) the high duty metal ball of single diameter is filled while swing die, using 304 stainless steel balls, hardness
It is worth 4 times for 175HV, about casting fine aluminium hardness.It is fine aluminium porous material bar diameter using a diameter of 1mm of 304 stainless steel balls
0.5 times.Referring to Fig. 2, Fig. 3；
(4) using with the matched pressure head of compression mould, the distance between pressure head and mold is less than 0.1mm.
(5) to carry out the compressive strength being compressed in the compression mould (cross section in pressure/mold under 0.1mm/s speed
Product) for 10MPa, about cast 0.33 times of fine aluminium yield strength, and pressurize 20 seconds.Referring to Fig. 4；
(6) compressive strength (cross-sectional area in pressure/mold) for carrying out downwards being compressed in compression mould with 1mm/s is
1.5 times of 45MPa, about casting fine aluminium yield strength, pressurize 60 seconds.
(7) unloading pressure takes out fine aluminium porous material after loosening 304 stainless steel balls, obtains squeezing a sample.
(8) (2)~(7) step 2 time is repeated, obtains squeezing sample three times.
The fine aluminium porous material prepared by the embodiment of the present invention, investment casting, can after being squeezed by metal ball
Find out that apparent metal ball squeezes impression.Meanwhile with the increase of extrusion passes, the impression distribution that metal ball squeezes is more intensive.
Fig. 5 is the fine aluminium porous material electron scanning micrograph after squeezing once, it can be seen that bar diameter is golden
Belong to ball to squeeze.Fig. 6 is original sample, it is primary to squeeze, squeeze three times after fine aluminium porous material Compressive Mechanical Properties curve, can be with
It was found that after being squeezed by metal ball, the mechanical property of fine aluminium porous material is obviously improved, and the mesh of the present invention is fully achieved
's.
The reinforcing of 2 magnesium base alloy porous material of embodiment
(1) using magnesium base alloy porous material, wherein aperture 4mm, bar diameter 1mm, the ratio of aperture and bar diameter is 4.
(2) magnesium base alloy porous material is put into compression mould, inner wall and the magnesium base alloy porous material of compression mould
Distance be 3mm；
(3) the high duty metal ball of single diameter is filled while swing die, using 304 stainless steel balls, hardness
It is worth 4 times for 175HV, about casting magnesium base alloy hardness.It is that magnesium base alloy is more using a diameter of 1.5mm of 304 stainless steel balls
1.5 times of Porous materials bar diameter.
(4) using with the matched pressure head of compression mould, the distance between pressure head and mold is less than 0.1mm.
(5) to be compressed under 0.5mm/s speed, make the compressive strength (cross section in pressure/mold in compression mould
Product) reach casting 0.5 times of magnesium base alloy yield strength, and pressurize 30 seconds.
(6) compressive strength (cross-sectional area in pressure/mold) for carrying out downwards being compressed in compression mould with 3mm/s is
Cast 1.5 times of magnesium base alloy yield strength, pressurize 30 seconds.
(7) unloading pressure takes out magnesium base alloy porous material after loosening 304 stainless steel balls, obtains squeezing a sample.
The reinforcing of 3 aluminum base alloy porous material of embodiment
(1) using aluminum base alloy porous material, wherein aperture 1.5mm, bar diameter 0.5mm, the ratio of aperture and bar diameter is 3.
(2) aluminum base alloy porous material is put into compression mould, the inner wall and aluminum base alloy porous material of compression mould
Distance be 3mm；
(3) the high duty metal ball of single diameter is filled while swing die, using 304 stainless steel balls, hardness
It is worth for 175HV, about the 3 of cast aluminum base alloy rigidity times.It is aluminium-based porous material using a diameter of 0.5mm of 304 stainless steel balls
Expect bar diameter 1 times.
(4) using with the matched pressure head of compression mould, the distance between pressure head and mold is less than 0.1mm.
(5) to be compressed under 0.1mm/s speed, make the compressive strength (cross section in pressure/mold in compression mould
Product) reach 0.1 times of cast aluminum base alloy yield strength, and pressurize 10 seconds.
(6) compressive strength (cross-sectional area in pressure/mold) being compressed in compression mould is carried out downwards with 0.1mm/s
It is 1.5 times of cast aluminum base alloy yield strength, pressurize 60 seconds.
(7) unloading pressure takes out aluminum base alloy porous material after loosening 304 stainless steel balls, obtains squeezing a sample.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent variations made according to the claims of the present invention, is still within the scope of the present invention.
Claims (3)
1. a kind of lightweight metal polyporous material intensifying method based on single diameter high duty metal ball, it is characterised in that：Profit
With the inside and outside space of high duty metal ball filling metal polyporous material of single diameter, metal ball is squeezed by mold, is made
Metal polyporous material locally receives extruding, and then metal polyporous material tissue is made more to refine and fine and close, so as to promote its mechanics
Performance.
2. according to the method described in claim 1, characterized by the following steps：
(1) using metal polyporous material, wherein aperture >=1.5mm, bar diameter >=0.5mm, meanwhile, ratio >=3 of aperture and bar diameter；
(2) metal polyporous material is put into compression mould, the inner wall of compression mould and the distance of metal polyporous material are more than etc.
In 1.5 times of metal polyporous material bar diameter；
(3) while swing die single diameter filling high duty metal ball, wherein high duty metal ball hardness for metal it is more
The 2 times or more of Porous materials hardness, it is 0.5~1.5 times of a diameter of metal polyporous material bar diameter of high duty metal ball, metal porous
It must be surrounded on the surrounding of material especially compression direction by high duty metal ball, ensure metal polyporous material not with compressing mould
Tool and pressure head are in direct contact；
(4) using with the matched pressure head of compression mould, the distance between pressure head and mold is less than the 0.5 of high duty metal bulb diameter
Times so that it overflows in the gap that high duty metal ball will not be between compression mould and pressure head；
(5) it is compressed downwards with the speed of 0.1~0.5mm/s, it is metal polyporous material to make the compressive strength in compression mould
0.1~0.5 times of matrix used Yield Strength of Metals, the compressive strength are the cross-sectional area in pressure/mold, and pressurize
10 seconds~30 seconds, high duty metal ball is made to be filled into the inner space of metal polyporous material；
(6) it is compressed downwards with the speed of 0.1~3mm/s, the compressive strength in compression mould is more than metal polyporous material institute
With the yield strength of parent metal material, pressurize 30 seconds~60 seconds, wherein compressive strength are the cross-sectional area in pressure/mold；
(7) unloading pressure loosens metal polyporous material material of the taking-up Jing Guo intensive treatment after high duty metal ball.
3. according to the method described in claim 2, it is characterized in that：(2)~(7) step 1 is repeated to 3 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711273123.2A CN108220835B (en) | 2017-12-06 | 2017-12-06 | Lightweight metal polyporous material intensifying method based on single diameter high duty metal ball |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711273123.2A CN108220835B (en) | 2017-12-06 | 2017-12-06 | Lightweight metal polyporous material intensifying method based on single diameter high duty metal ball |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108220835A true CN108220835A (en) | 2018-06-29 |
| CN108220835B CN108220835B (en) | 2019-08-20 |
Family
ID=62653854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711273123.2A Active CN108220835B (en) | 2017-12-06 | 2017-12-06 | Lightweight metal polyporous material intensifying method based on single diameter high duty metal ball |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108220835B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120491A (en) * | 1994-07-13 | 1996-04-17 | 斯托克·斯格瑞姆股份有限公司 | Foam product |
| CN101386949A (en) * | 2007-09-12 | 2009-03-18 | 中国科学院金属研究所 | High-strength and high damping compound material and preparation method thereof |
| EP2243757A1 (en) * | 2009-04-25 | 2010-10-27 | Messier Bugatti | Apparatus and method of densifying porous articles |
| CN102189261A (en) * | 2011-05-30 | 2011-09-21 | 华中科技大学 | Densification method of porous workpiece |
| CN102586642A (en) * | 2012-03-08 | 2012-07-18 | 浙江工贸职业技术学院 | Preparation method and production device for foam metal |
| CN104630527A (en) * | 2014-12-30 | 2015-05-20 | 北京安泰钢研超硬材料制品有限责任公司 | Method for preparing copper-based diamond composite material |
| CN104858430A (en) * | 2014-02-25 | 2015-08-26 | 通用电气公司 | Manufacturing method of three-dimensional part |
| CN104858394A (en) * | 2015-05-27 | 2015-08-26 | 杨文澍 | Metal ceramic composite material preparation method |
| CN107130133A (en) * | 2017-05-26 | 2017-09-05 | 哈尔滨工业大学 | A kind of ceramic/metal composite materials of gradient bicontinuous structure with and its preparation method and application |
-
2017
- 2017-12-06 CN CN201711273123.2A patent/CN108220835B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120491A (en) * | 1994-07-13 | 1996-04-17 | 斯托克·斯格瑞姆股份有限公司 | Foam product |
| CN101386949A (en) * | 2007-09-12 | 2009-03-18 | 中国科学院金属研究所 | High-strength and high damping compound material and preparation method thereof |
| EP2243757A1 (en) * | 2009-04-25 | 2010-10-27 | Messier Bugatti | Apparatus and method of densifying porous articles |
| CN102189261A (en) * | 2011-05-30 | 2011-09-21 | 华中科技大学 | Densification method of porous workpiece |
| CN102586642A (en) * | 2012-03-08 | 2012-07-18 | 浙江工贸职业技术学院 | Preparation method and production device for foam metal |
| CN104858430A (en) * | 2014-02-25 | 2015-08-26 | 通用电气公司 | Manufacturing method of three-dimensional part |
| CN104630527A (en) * | 2014-12-30 | 2015-05-20 | 北京安泰钢研超硬材料制品有限责任公司 | Method for preparing copper-based diamond composite material |
| CN104858394A (en) * | 2015-05-27 | 2015-08-26 | 杨文澍 | Metal ceramic composite material preparation method |
| CN107130133A (en) * | 2017-05-26 | 2017-09-05 | 哈尔滨工业大学 | A kind of ceramic/metal composite materials of gradient bicontinuous structure with and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108220835B (en) | 2019-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103614586B (en) | Al 2o 3the preparation method that hollow ball/aluminium is composite porous | |
| CN103589891B (en) | Containing Al 2o 3the preparation method of the magnesium-base porous compound material of hollow ball | |
| ZA200301474B (en) | A method of producing a multilayer body by coalescence and the multilayer body produced. | |
| CN107803626A (en) | A kind of manufacture method of Stainless-steel fibre aluminum connecting rod | |
| CN114807683B (en) | Titanium alloy lattice reinforced aluminum-based composite material and preparation method thereof | |
| CN107552793A (en) | A kind of foamed aluminium filling in situ light-wall pipe and preparation method thereof | |
| CN107326208A (en) | A kind of foam magnesium or foam aluminum alloy and preparation method thereof | |
| CN106311946A (en) | Die-forming method taking non-maximal cross section as die parting face based on combined die | |
| JP5500541B2 (en) | Method for producing molded body of plant material and molded body thereof | |
| CN108220835B (en) | Lightweight metal polyporous material intensifying method based on single diameter high duty metal ball | |
| CN105234405B (en) | A kind of preparation method of the iron-based powder metallurgy parts with densified surface | |
| CN109706337A (en) | A kind of preparation method of tungsten particle reinforced aluminum matrix composites | |
| JP4048251B2 (en) | Method for producing porous metal body, porous metal body and porous metal body structure | |
| CN107740004A (en) | The manufacture method of Stainless-steel fibre aluminum connecting rod | |
| CN108220836B (en) | Lightweight metal polyporous material intensifying method based on different-diameter high duty metal ball | |
| CN108160730A (en) | A kind of pressing method of low volume fraction ceramic particle reinforced aluminium base composite material bar | |
| CN104070164A (en) | Method for sintering and synthesizing powder into porous titanium aluminum intermetallic compound | |
| CN110885934A (en) | Process for squeeze casting of magnesium alloy casting | |
| JP4524426B2 (en) | Manufacturing method of low elastic modulus amorphous carbon fiber reinforced aluminum composites | |
| CN106048324A (en) | Carbon nano tube reinforced aluminum-magnesium composite alloy material for automobile electronic packaging and preparation method of alloy material | |
| CN1327014C (en) | Method for preparing aluminium based composite material enhanced by AlCuFe through extrusion casting method | |
| US10850328B1 (en) | Method of making iron matrix composite | |
| CN111055084B (en) | Method for manufacturing annular special-shaped part combined by multiple alloy materials | |
| CN105057676B (en) | Metal fiber porous material with surface reticular sintering film structure and manufacturing method | |
| JP6942434B2 (en) | Manufacturing method of high-density iron-based sintered material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20180629 Assignee: ZHEJIANG WUMA REDUCER Co.,Ltd. Assignor: ZHEJIANG INDUSTRY & TRADE VACATIONAL College Contract record no.: X2023330000071 Denomination of invention: Strengthening Method of Lightweight Metal Porous Materials Based on Single Diameter High Strength Metal Balls Granted publication date: 20190820 License type: Common License Record date: 20230308 |