CN108927514A - A kind of production method of powder metallurgy spherolite - Google Patents
A kind of production method of powder metallurgy spherolite Download PDFInfo
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- CN108927514A CN108927514A CN201810942462.3A CN201810942462A CN108927514A CN 108927514 A CN108927514 A CN 108927514A CN 201810942462 A CN201810942462 A CN 201810942462A CN 108927514 A CN108927514 A CN 108927514A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 99
- 238000012216 screening Methods 0.000 claims abstract description 32
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 238000005245 sintering Methods 0.000 claims abstract description 26
- 239000008188 pellet Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000000280 densification Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 abstract description 20
- 229910052751 metal Inorganic materials 0.000 abstract description 20
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 12
- 238000010923 batch production Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229940095674 pellet product Drugs 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
-
- B22F1/0003—
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of production methods of powder metallurgy spherolite, are related to pellet production technical field, it includes the following steps S1: being granulated, powder is poured into pelletizer, produces spherolite by pelletizer；S21: medium mixing: powder medium and the spherolite placement in S1 are sufficiently mixed in a reservoir, spherolite is surrounded by powder medium, forms ball powder mixture；S22: fine and close: the ball powder mixture that will be mixed in S21 is placed on press device and is suppressed, and forms fine and close spherolite；S23: the ball powder mixture suppressed in S22 is put into screening plant and is sieved, obtains spherolite by spherolite screening；S3: spherolite obtained in S23 is put into sintering furnace and calcines, obtains sintered spherolite by sintering.The production method of powder metallurgy spherolite of the invention is compared with existing technology, at low cost, production capacity is big, in the prior art, the technical issues of small metal ball grain can not be produced in batches.
Description
Technical field
The present invention relates to pellet production technical field, especially a kind of production method of powder metallurgy spherolite.
Background technique
Metal spherolite can wide model be used in oil drilling drilling rod surface built-up welding to solve wear-resistant, the corrosion resistant of drilling rod
Erosion (needing to select wear-resisting, corrosion-resistant metal) effectively prolongs its service life to reach；Ball pen ball can also be used in
Manufacture；Manufacture of surfacing welding electrode etc. field.
And when prior art production pellet, usually all it is first to melt metal powder, metal strip is then made, then draws again
Silk, finally shearing forms metal stock.
As in existing ball pen production process, using a setting is first made in prepared metal powder after high temperature melting
Then this metal strip is carried out the metal for being drawn into required size by the metal strip of shape after certain temperature is softened again
Silk, then this wire cut into the metal stock of required size, it finally carries out being finish-machined to gold used in ballpoint pen
Belong to bead.
The deficiency of the production method is: be first production process is too long, energy consumption is excessive, it is used utilize set
Standby cost is excessively high.One converter (being not less than 1,000,000 yuan) energy consumption it is minimum will not be lower than 500KW/h, squeeze wire-drawing equipment
A set of (being not less than 500,000 yuan) energy consumption is also not less than 50 KW/h.
Therefore, through inventor for a long time the study found that metal pellet product individual is too small, usually on a 0.1-0.18 millimeters of left sides
The right side, liquid phase cannot sufficiently infiltrate every metal grain of filling in sintering process, cause the interiors of products metallurgical structure in more
Poroid tissue defects are unable to complete the densification requirement of its metal, are not able to satisfy the use condition of product, therefore it is produced in batches
Difficulty it is big, there is presently no batch production pellet production method.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology, provides a kind of high production efficiency, the at low cost, quality of production
It is good and can batch production batch production powder metallurgy spherolite production method.
The purpose of the present invention is achieved through the following technical solutions: a kind of production method of powder metallurgy spherolite, it includes
Following steps:
S1: it is granulated, powder is put into pelletizer, spherolite is produced by pelletizer；
S2: compacting is fine and close, and the spherolite in S1 is carried out compacting densification, the specific steps of which are as follows:
S21: medium mixing: powder medium and the spherolite placement in S1 are sufficiently mixed in a reservoir, make spherolite by powder medium
It surrounds, forms ball powder mixture；
S22: fine and close: the ball powder mixture that will be mixed in S21 is placed on press device and is suppressed, and forms fine and close ball
Grain；
S23: the ball powder mixture suppressed in S22 is put into screening plant and is sieved, obtains spherolite by spherolite screening；
S3: spherolite obtained in S23 is put into sintering furnace and calcines, obtains sintered spherolite by sintering.
Preferably, the S1 step granulation the following steps are included:
S11: powder is put into pelletizer, produces spherolite by pelletizer by spherolite processed；
S12: partial size overstriking continues to add powder into pelletizer, and adds auxiliary material, so that the partial size overstriking of spherolite；
S13: spherolite obtained in S12 is put into screening plant and is sieved, obtains meeting size requirements by partial size screening
Spherolite.
Preferably, the partial size sifted out in the S13 spherolite less than normal, is re-introduced into S12 step, and to pellet into
Row partial size overstriking processing.
Preferably, the partial size sifted out in the S13 spherolite bigger than normal, then enter in attrition mill wipe it is broken, wipe it is broken after
Powder be re-introduced into step S11 and carry out spherolite processed.
Preferably, the volume of the powder medium in the S21 is greater than the volume of spherolite.
Preferably, the press device in the S22 is hydraulic press or cold isostatic press.
Preferably, the S3 sintering the following steps are included:
S31: spherolite obtained in S23 is put into container, then adds high-temperature resistant medium powder by addition high-temperature resistant medium powder
Then end is uniformly mixed, so that spherolite is surrounded by high-temperature resistant medium powder, form ball powder mixture；
S32: high temperature sintering: the ball powder mixture in the container in S31 is put into high temperature sintering furnace and is calcined；
S33: the ball powder mixture calcined is cooled down, is then sieved, obtained in being put into screening plant by screening
Spherolite.
Preferably, the fusing point of the high-temperature resistant medium powder is higher than the fusing point of spherolite.
The invention has the following advantages that
1, pelletizer, screening machine used by this method, press device and high temperature sintering furnace are traditional equipment, so that
The workshop for producing the powder metallurgy spherolite is easy to set up, and the equipment cost expended is low.
2, compared with traditional processing method, processing step is simplified this method, and metal powder fusing is omitted and manufactures
Metal strip and the process that metal strip is made to wire, and the production method is able to produce 50 public affairs of hard alloy for each person every day
Jin or more, 30 kilograms of steel ball grain or more are able to produce, compared to the prior art, production capacity is substantially enhanced, and is able to achieve work
Industryization batch production.
3, this method is granulated by traditional equipment, suppresses the little particle ball that fine and close, sintering production goes out fine and close high rigidity
Grain, and can be realized batch production batch production, to solve in the prior art, the technology that small metal ball grain can not be produced in batches
Problem.
Detailed description of the invention
Fig. 1 is the stress diagram of ball powder mixture when hydraulic press is suppressed；
Fig. 2 is the stress diagram of ball powder mixture when cold isostatic press is suppressed；
Fig. 3 is stress diagram of the spherolite when suppressing fine and close；
Fig. 4 is the crystalline phase figure without the spherolite after compacting sintering；
Fig. 5 is the crystalline phase figure of spherolite of this method after suppressing dense sintering.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, a kind of production method of powder metallurgy spherolite, it the following steps are included:
S1: it is granulated, powder is put into pelletizer, spherolite is produced by pelletizer；
Being granulated powder used is the powder with spherolite with medium, and during powder is made, and is contained centainly in powder
The liquid phase medium of ratio does not have to according to the medium of spherolite, and ratio shared by selected liquid phase medium and liquid phase medium is not yet
It is identical, and also contain powder compacting agent in the powder.
In the present embodiment, be granulated the following steps are included:
S11: powder is put into pelletizer by spherolite processed, is produced spherolite by pelletizer, i.e., is being made between powder and powder
Mutually it polymerize under the action of grain machine, forms pellet；
S12: partial size overstriking continues to add powder into pelletizer, and adds auxiliary material, so that the partial size overstriking of spherolite；This
The powder in place is identical as powder used in S11, and auxiliary material is spray, and spray makes powder wet, so that
Wet powder in the spherolite and movement in movement agglomerates, so that the size of spherolite is gradually increased, to complete ball
The partial size overstriking of grain.
S13: spherolite obtained in S12 is put into screening plant and is sieved, obtains meeting size and want by partial size screening
The spherolite asked, screening plant are existing equipment, it can sift out the bulky grain spherolite more than production requirement, can also sift out not
Meet the pellet of production requirement, therefore screening plant used herein can be two-stage screening plant, can sift out bulky grain
Spherolite can sift out little particle spherolite again, or use two screening plants, a screening bulky grain spherolite, and another is sieved small
Grain spherolite, in the present embodiment, preferred use can disposably sift out bulky grain and short grained two-stage screening plant.
In the present embodiment, the partial size sifted out in S13 spherolite less than normal, is re-introduced into S12 step, and to pellet
Partial size overstriking processing is carried out, until meeting the requirements, and the spherolite that the partial size that sifts out in S13 is bigger than normal, then enter attrition mill
In wipe it is broken, wipe it is broken after powder be re-introduced into step S11 and carry out spherolite processed so that powder being capable of abundant benefit
With avoiding the waste of raw material.
The pellet come is screened out, internal structure is more open, and intensity is inadequate, it is easily dispersed under external force,
And during the sintering process, since the gap in spherolite is bigger, liquid phase medium can not just fill the gap in spherolite at all,
Therefore requirement is not achieved in spherolite its physical property that sintering comes out completely, amplify 2000 times, brilliant as scheming such as Fig. 4 institute
Show, ball interior gap is larger, therefore before sintering, and following S2 step is carried out to pellet.
S2: compacting is fine and close, and the spherolite in S1 is carried out compacting densification, the specific steps of which are as follows:
S21: medium mixing: powder medium and the spherolite placement in S1 are sufficiently mixed in a reservoir, make spherolite by powder medium
It surrounds, forms ball powder mixture；Powder medium used herein can use same metal, other metals or nonmetallic powder
End, and forming agent is not contained in the powder medium, after compression moulding, rapid dispersion and powder can be formed under external force
End, after powder medium is mixed with spherolite, the volume of powder medium is greater than the volume of spherolite, so that powder medium will be several
Pellet is surrounded, and make between two neighboring spherolite it is again mutually isolated, it is in the present embodiment, preferred to use and spherolite
The sphere of powder ratio of the powder of same material, medium powder and spherolite is between 1.1 ~ 1.5.
S22: fine and close: the ball powder mixture that will be mixed in S21 is placed on press device and is suppressed, and is formed fine and close
Spherolite；When compacting, adoptable press device is hydraulic press or cold isostatic press.
As shown in Figure 1, being suppressed using hydraulic press, ball powder mixture is placed in pressing mold, it is preferred that use 100T
Hydraulic press, the pressing time is 50S ~ 70S, preferably 60S, as shown in figure 3, press machine transfers the pressure in powder medium,
Powder medium transmits pressure again between each other, finally pellet surface is under pressure, so that spherolite is compressed, thus
So that spherolite is fine and close.
As shown in Fig. 2, being suppressed using cold isostatic press, sphere of powder mixture is placed in soft container, and will be soft
Body container is sealed, which can be rubber bag, then soft container is placed on to the compression of cold isostatic press
It is intracavitary, then start cold isostatic press, as shown in figure 3, pressure is transmitted to pellet surface by powder, so that spherolite is pressed
Contracting, so that spherolite is fine and close, the preferred cold pressure for waiting smoothing press is 200T ~ 1000T.
In compaction process, the surrounding of single spherolite is surrounded by powder medium, and external force is transmitted to spherolite by powder medium
Surface, spherolite to centre of sphere compressing and compacting, ensure that the shape of sphere under force, and powder medium separates sphere,
Sphere unbalance stress brought by contacting between sphere and sphere is also solved, the technical issues of sphere compressive deformation.
In the present embodiment, it is preferably suppressed using cold isostatic press, because cold isostatic press is to sphere of powder mixture
When compacting, sphere of powder mixture surface uniform force, therefore every spherolite, in compacting, the size of institute's stress is also identical, thus more
It is easily guaranteed that the densification effects of spherolite.
S23: the ball powder mixture suppressed in S22 is put into screening plant and is sieved, obtains ball by spherolite screening
Grain；After suppressing densification in S22 step, powder medium is also compacted, and is difficult to be dispersed under not by external force, therefore will
It is put into screening plant, by the vibration and rotation of screening plant so that powder medium is loose, it is loose after powder
Medium is sized equipment and sifts out, and powder is collected, for use as next fine and close.The spherolite obtained by the screening machine, then
For the spherolite after densification.
S3: spherolite obtained in S23 is put into sintering furnace and calcines, obtains sintered spherolite by sintering.
Further, the S3 sintering the following steps are included:
S31: spherolite obtained in S23 is put into container, then adds high-temperature resistant medium powder by addition high-temperature resistant medium powder
Then end is uniformly mixed, so that spherolite is surrounded by high-temperature resistant medium powder, form ball powder mixture；High-temperature resistant medium powder
Fusing point is higher than the fusing point of spherolite
S32: high temperature sintering: the ball powder mixture in the container in S31 is put into high temperature sintering furnace and is calcined；In high temperature
When sintering, high-temperature resistant medium surrounds spherolite, and spherolite is avoided to contact with spherolite, so that the liquid between spherolite and spherolite
Phase medium after thawing not in contact with, and avoid spherolite bonding.
S33: the ball powder mixture calcined is cooled down, is then sieved in being put into screening plant by screening,
Obtain spherolite；When screening, the high-temperature medium powder screened out is recycled, the spherolite collected after screening is to meet production requirement
Spherolite, spherolite amplification 2000 times after, crystalline phase figure is as shown in Figure 5.
By the production method of this powder metallurgy spherolite, production efficiency is greatly improved, to produce hard conjunction
For golden or iron-based, the spherolite is produced with traditional mold compression moulding method, by taking diameter is the spherolite of 1mm as an example, every YG6 board
Number the weight of hard alloy be 0.0078 gram, production is with iron-based similar steel ball grain, then every weight is 0.004 gram, adopts
With traditional method, an artificial work can only produce 1000 spherolites in 8 hours, therefore a people can produce YG6 hard alloy in one day
7.8 gram；4 grams of steel class spherolite can be produced.If worker uses automatic press, efficiency can be improved, but everyone one day
Production YG6 hard alloy and steel class spherolite do not exceed 1 kilogram respectively yet.And use this method produces spherolite, into our company excessively
It was verified that the weight of people's darg 8 hours production YG6 hard alloy is more than 50 kilograms, and produce the weight of steel ball grain
More than 30 kilograms, efficiency has obtained greatly enhancing amount, can be produced in batches completely with batch production.
" one embodiment ", " another embodiment ", " embodiment ", " preferred implementation spoken of in the present specification
Example " etc., referring to combining specific features, structure or the feature of embodiment description includes describing extremely in the application generality
In few one embodiment.It is not centainly to refer to the same embodiment that statement of the same race, which occur, in multiple places in the description.Into one
For step, when describing a specific features, structure or feature in conjunction with any embodiment, what is advocated is to combine other implementations
Example realizes that this feature, structure or feature are also fallen within the scope of the present invention.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations will fall in this Shen
It please be within disclosed scope and spirit.More specifically, disclose in the application, drawings and claims in the range of, can
With the building block and/or a variety of variations and modifications of layout progress to theme combination layout.In addition to building block and/or layout
Outside the modification and improvement of progress, to those skilled in the art, other purposes also be will be apparent.
Claims (8)
1. a kind of production method of powder metallurgy spherolite, it the following steps are included:
S1: it is granulated, powder is put into pelletizer, spherolite is produced by pelletizer；
S2: compacting is fine and close, and the spherolite in S1 is carried out compacting densification, the specific steps of which are as follows:
S21: medium mixing: powder medium and the spherolite placement in S1 are sufficiently mixed in a reservoir, make spherolite by powder medium
It surrounds, forms ball powder mixture；
S22: fine and close: the ball powder mixture that will be mixed in S21 is placed on press device and is suppressed, and forms fine and close ball
Grain；
S23: the ball powder mixture suppressed in S22 is put into screening plant and is sieved, obtains spherolite by spherolite screening；
S3: spherolite obtained in S23 is put into sintering furnace and calcines, obtains sintered spherolite by sintering.
2. a kind of production method of powder metallurgy spherolite according to claim 1, it is characterised in that: the S1 step is made
Grain the following steps are included:
S11: powder is put into pelletizer, produces spherolite by pelletizer by spherolite processed；
S12: partial size overstriking continues to add powder into pelletizer, and adds auxiliary material, so that the partial size overstriking of spherolite；
S13: spherolite obtained in S12 is put into screening plant and is sieved, obtains meeting size requirements by partial size screening
Spherolite.
3. a kind of production method of powder metallurgy spherolite according to claim 2, it is characterised in that: sifted out in the S13
Partial size spherolite less than normal, be re-introduced into S12 step, and partial size overstriking processing is carried out to pellet.
4. a kind of production method of powder metallurgy spherolite according to claim 2, it is characterised in that: sifted out in the S13
Partial size spherolite bigger than normal, then enter in attrition mill wipe it is broken, wipe it is broken after powder be re-introduced into step S11 and carry out
Spherolite processed.
5. a kind of production method of powder metallurgy spherolite according to claim 1, it is characterised in that: the powder in the S21
The volume of last medium is greater than the volume of spherolite.
6. a kind of production method of powder metallurgy spherolite according to claim 1, it is characterised in that: the pressure in the S22
Power equipment is hydraulic press or cold isostatic press.
7. a kind of production method of powder metallurgy spherolite according to claim 1, it is characterised in that: the sintering packet of the S3
Include following steps:
S31: spherolite obtained in S23 is put into container, then adds high-temperature resistant medium powder by addition high-temperature resistant medium powder
Then end is uniformly mixed, so that spherolite is surrounded by high-temperature resistant medium powder, form ball powder mixture；
S32: high temperature sintering: the ball powder mixture in the container in S31 is put into high temperature sintering furnace and is calcined；
S33: the ball powder mixture calcined is cooled down, is then sieved, obtained in being put into screening plant by screening
Spherolite.
8. a kind of production method of powder metallurgy spherolite according to claim 7, it is characterised in that: the high-temperature resistant medium
The fusing point of powder is higher than the fusing point of spherolite.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114632930A (en) * | 2022-03-16 | 2022-06-17 | 成都亿特金属制品有限公司 | Isostatic pressing die for thin-wall conical part and production method |
| CN115636674A (en) * | 2022-10-27 | 2023-01-24 | 广东工业大学 | High-hardness and high-toughness silicon nitride bearing ball and preparation method and application thereof |
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| CN87103970A (en) * | 1986-06-02 | 1987-12-16 | 联合工艺公司 | The goods of nickel-base heat resisting superalloy and manufacture method |
| JPH01181502A (en) * | 1988-01-12 | 1989-07-19 | Seiko Epson Corp | Manufacture of rare earth permanent magnet |
| CN101224500A (en) * | 2007-12-17 | 2008-07-23 | 金堆城钼业股份有限公司 | Super particle size molybdenum powder preparing method |
| CN101386524A (en) * | 2008-10-28 | 2009-03-18 | 安徽工业大学 | Method for preparing porcelain granule from waste paper-making sludge |
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| CN114632930A (en) * | 2022-03-16 | 2022-06-17 | 成都亿特金属制品有限公司 | Isostatic pressing die for thin-wall conical part and production method |
| CN114632930B (en) * | 2022-03-16 | 2024-03-26 | 成都亿特金属制品有限公司 | Isostatic pressing die for thin-wall conical part and production method |
| CN115636674A (en) * | 2022-10-27 | 2023-01-24 | 广东工业大学 | High-hardness and high-toughness silicon nitride bearing ball and preparation method and application thereof |
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