CN108149101A - A kind of manufacturing process of high-density large-area tungsten-copper alloy life slab - Google Patents
A kind of manufacturing process of high-density large-area tungsten-copper alloy life slab Download PDFInfo
- Publication number
- CN108149101A CN108149101A CN201711132714.8A CN201711132714A CN108149101A CN 108149101 A CN108149101 A CN 108149101A CN 201711132714 A CN201711132714 A CN 201711132714A CN 108149101 A CN108149101 A CN 108149101A
- Authority
- CN
- China
- Prior art keywords
- powder
- copper alloy
- warm
- rolling
- tungsten
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
-
- 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
- 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
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
-
- 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
- C22C1/045—Alloys based on refractory metals
-
- 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
Abstract
A kind of manufacturing process of high-density large-area tungsten-copper alloy life slab, its main feature is that：First, according to certain mass than weighing W powder and Cu powder, and organic additive is weighed according to certain mass ratio, the wherein mass ratio of W powder and Cu powder is 4:1；Then, the mixture that load weighted W powder, Cu powder and organic additive are formed after mixing is heated to warm-rolling temperature 60 C~150 DEG C, and keeps the temperature 1 hour；Then, the roll of powder rolls is heated to the warm-rolling temperature identical with mixture, and after adjusting roller gap, the forming of warm-rolling strip green compact is carried out to mixture, high-density large-area tungsten-copper alloy life slab is made.Simple production process of the present invention, it is at low cost, by using a small amount of organic additive in W, Cu powder, it can effectively improve the formability and relative density of sheet alloy green compact.Meanwhile the organic additive added in during warm-rolling, it is easily removed in follow-up low temperature heat treatment, ensure that the purity of powder raw material.
Description
Technical field
The invention belongs to hard alloy dense sheet material preparing technical fields more particularly to one kind to be used on a large scale
The high-density large-area tungsten-copper alloy of electronic package material and W-Cu alloy electric discharging machining electrode materials gives birth to the forming of slab
Method.
Background technology
W-Cu alloys rely on its good thermal conductivity and conductivity, the coefficient of thermal expansion of stabilization, excellent chemical stability
And the resistance to ablation characteristics of arc resistant, particularly prepare the pass that tungsten-copper alloy plank receives numerous scientific research scholars and industrial producers
Note.Early in the sixties in 19th century, foreign countries just have researcher to start to grind Cu alloy powders rolling progress correlation theory with system
Study carefully.However, powder rolling research in China's is started late, just there is preliminary understanding to the research of powder rolling until nineteen sixty,
By 50 years of researches and development, do not allow to neglect although in terms of powder rolling technology research with process equipment manufacture view having
Depending on achievement, such as：For preparing porous Strip, more metal layer composite board bands, high purity metal plank and preliminary
Powder rolling process technical modelling calculating etc..However, compared with external production technology, the key technology point of powder rolling process is still
So there are many problems, and much research still rests on laboratory stage, can not carry out large-scale industrial production.Especially
It is for preparing for tungsten-copper alloy plank, the domestic mode of production mainly includes at present：Blocky tungsten copper after traditional melting infiltration sintering
Alloy is sliced, powder warm compactingprocess, it is powder injection-molded the methods of, but can not due to being limited by mold for the above method
It is made that plane is larger, more continuous tungsten-copper alloy plank.
At abroad, there is part researcher to start to prepare tungsten-copper alloy using the processing method of powder rolling, and
Shape and the larger tungsten-copper alloy green compact of surface area can be prepared by powder rolling, but in subsequent transportation and is processed sintered
Cheng Zhong, since the density of green compact is smaller, intensity is relatively low, is extremely easily deformed, fragmentation.
In order to overcome the above problem, on the basis of original powder rolling preparation process, it is proposed that " metal powder warm-rolling work
This concept of skill ", i.e.,：A certain proportion of additive is added in, and properly increase powder rolling process before alloy powder rolling
The temperature of middle roll and powder.
The effect of additive is most important, and type and the dosage of additive directly affect tungsten-copper alloy powder in warm-rolling process
In morphotropism and mouldability, also influence the compactness and uniformity of the sintering of final tungsten-copper alloy slab.The additive of addition,
Mainly comprising lubricant component with bonding constituent element, lubricant component causes the rheological property of itself to change due to affected by temperature
Become, may advantageously facilitate the mutual lubrication between metal powder, enhance the flowing of powder particle, effectively reduce alloy powder and roll
Macroscopic deformation drag during system, further improves the density of rolled slab, while reduces raw slab after rolling deformation
The characteristics of internal stress is unevenly distributed.Bonding constituent element helps to promote the strength and toughness of rolled slab, in advantageous subsequent process
Transport and processing.
Ideal additive can lenitively crack in tungsten-copper alloy slab sintering process in lower temperature range
With volatilization, decompose the gas that releases must it is non-corrosive, nontoxic, non-combustible, without bad smell, it is general to select additive most
It is low molecular weight organic compound（Such as：Paraffin, stearic acid, oleic acid, polyvinyl alcohol, low density polyethylene (LDPE) etc.）, and be not easy and close
Gold element chemically reacts.
During tungsten-copper alloy powder warm-rolling, general control temperature is between 60 DEG C to 180 DEG C, so the addition used
The most of of agent are liquid additive：Based on atoleine and polyvinyl alcohol, and such additive is burnt in tungsten-copper alloy slab
During knot, temperature rise will crack, volatilize to before 300 DEG C~400 DEG C.
Invention content
It is above-mentioned there are problem and shortage it is an object of the invention to be directed to, provide it is a kind of simple for process, easy to operate, in tungsten copper
A small amount of organic liquid phase additive is added in alloy powder, and on the basis of original powder rolling, by roll and alloyed powder
End is heated to the mutually synthermal tungsten-copper alloy life plate for being rolled, can obtaining slab density bigger, intensity higher, shape bigger
The manufacturing process of base.
The technical proposal of the invention is realized in this way：
The manufacturing process of high-density large-area tungsten-copper alloy life slab of the present invention, its main feature is that including the following steps：
Step 1）, according to certain mass weigh organic additive than weighing W powder and Cu powder, and according to certain mass ratio,
Wherein the mass ratio of W powder and Cu powder is 4:1；
Step 2）, the mixture that load weighted W powder, Cu powder and organic additive are formed after mixing is heated to warm-rolling
Temperature 60 C~150 DEG C, and keep the temperature 1 hour；
Step 3）, the roll of powder rolls is heated to the warm-rolling temperature identical with mixture, and after adjusting roller gap, it is right
Mixture carries out the forming of warm-rolling strip green compact, and high-density large-area tungsten-copper alloy life slab is made.
Wherein, above-mentioned organic additive is paraffin, stearic acid, oleic acid, zinc stearate, polyvinyl alcohol, low density polyethylene (LDPE)
In one kind or at least two composition；Preferably, organic additive is formed by atoleine and polyvinyl alcohol, and organic
The addition of additive is the 0.1%~2.0% of W powder and Cu powder gross masses.
Above-mentioned steps 2）Middle W powder, Cu powder and organic additive need to be sufficiently mixed for 24 hours.
Above-mentioned steps 3）The mill speed of middle roll is 0.3m/min~1.5m/min.
Above-mentioned steps 3）Middle roller gap is 0.3mm~0.7mm.
Compared with prior art, the present invention with following remarkable advantage：
1st, the present invention in tungsten-copper alloy powder by adding in a small amount of organic liquid phase additive, and make it abundant with alloy powder
Mixing, then on the basis of original powder rolling, is heated to 60 DEG C to 150 DEG C to roll and alloy powder and rolls.
With conventional powder room temperature roll compared with, by this method improved technique can obtain slab density bigger, intensity higher,
The tungsten-copper alloy green compact of shape bigger；
2nd, simple production process of the present invention, it is easy to operate, it is at low cost, by using a small amount of organic additive in W, Cu powder,
The formability and relative density of sheet alloy green compact can effectively be improved.Meanwhile the organic additive added in during warm-rolling,
It is easily removed in follow-up low temperature heat treatment, ensure that the purity of powder raw material.
Specific embodiment
Technical solution of the present invention is further described below by specific embodiment.
Embodiment 1：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.5% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 60 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 60 DEG C, and adjusts roller gap to 0.7mm, then carries out metal powder warm-rolling, mill speed
For 1.5m/min.Tungsten-copper alloy obtained gives birth to slab, density 11.296g/cm3。
Embodiment 2：
First, it is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.5% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 80 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 80 DEG C, and adjusts roller gap to 0.7mm, then carries out metal powder warm-rolling, mill speed
For 1m/min.Tungsten-copper alloy obtained gives birth to slab, density 11.789g/cm3。
Embodiment 3：
First, it is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.5% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 110 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 110 DEG C, and adjusts roller gap to 0.7mm, then carries out metal powder warm-rolling, mill speed
For 0.5m/min.Tungsten-copper alloy obtained gives birth to slab, density 12.287g/cm3。
Embodiment 4：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.5% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 135 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 135 DEG C, and adjusts roller gap to 0.7mm, then carries out metal powder warm-rolling, mill speed
For 0.3m/min.Tungsten-copper alloy obtained gives birth to slab, density 12.659g/cm3。
Embodiment 5：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.5% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 150 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 150 DEG C, and adjusts roller gap to 0.7mm, then carries out metal powder warm-rolling, mill speed
For 0.2m/min.Tungsten-copper alloy obtained gives birth to slab, density 13.362g/cm3。
Embodiment 6：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.1% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 110 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 110 DEG C, and adjusts roller gap to 0.3mm, then carries out metal powder warm-rolling, mill speed
For 0.8m/min.Tungsten-copper alloy obtained gives birth to slab, density 12.202g/cm3。
Embodiment 7：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.3% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 110 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 110 DEG C, and adjusts roller gap to 0.3mm, then carries out metal powder warm-rolling, mill speed
For 0.7m/min.Tungsten-copper alloy obtained gives birth to slab, density 12.287g/cm3。
Embodiment 8：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.6% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 110 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 110 DEG C, and adjusts roller gap to 0.3mm, then carries out metal powder warm-rolling, mill speed
For 0.6m/min.Tungsten-copper alloy obtained gives birth to slab, density 12.227g/cm3。
Embodiment 9：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 0.9% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 110 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 110 DEG C, and adjusts roller gap to 0.3mm, then carries out metal powder warm-rolling, mill speed
For 0.4m/min.Tungsten-copper alloy obtained gives birth to slab, density 12.013g/cm3。
Embodiment 10：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 1.5% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 110 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 110 DEG C, and adjusts roller gap to 0.3mm, then carries out metal powder warm-rolling, mill speed
For 0.4m/min.Tungsten-copper alloy obtained gives birth to slab, density 11.921g/cm3。
Embodiment 11：
First choice is in mass ratio 4:1 proportioning weighs W powder and Cu powder respectively, according to mass ratio 2.0% weigh atoleine with
The additive of polyvinyl alcohol composition.Then, load weighted W powder, Cu powder are uniformly mixed with additive formed afterwards for 24 hours it is mixed
It closes object and is heated to 110 DEG C, and keep the temperature 1h.Then, the mixture after heating is sent into the feeding funnel of powder rolls, simultaneously will
The roll of powder rolls is heated to 110 DEG C, and adjusts roller gap to 0.3mm, then carries out metal powder warm-rolling, mill speed
For 0.5m/min.Tungsten-copper alloy obtained gives birth to slab, density 11.228g/cm3。
The present invention is described by embodiment, but is not limited the invention, with reference to description of the invention, institute
Other variations of disclosed embodiment, are such as readily apparent that the professional person of this field, such variation should belong to
Within the scope of the claims in the present invention limit.
Claims (5)
1. a kind of manufacturing process of high-density large-area tungsten-copper alloy life slab, it is characterised in that include the following steps：
Step 1）, according to certain mass weigh organic additive than weighing W powder and Cu powder, and according to certain mass ratio,
Wherein the mass ratio of W powder and Cu powder is 4:1；
Step 2）, the mixture that load weighted W powder, Cu powder and organic additive are formed after mixing is heated to warm-rolling
Temperature 60 C~150 DEG C, and keep the temperature 1 hour；
Step 3）, the roll of powder rolls is heated to the warm-rolling temperature identical with mixture, and after adjusting roller gap, it is right
Mixture carries out the forming of warm-rolling strip green compact, and high-density large-area tungsten-copper alloy life slab is made.
2. the manufacturing process of high-density large-area tungsten-copper alloy life slab according to claim 1, it is characterised in that：It is above-mentioned to have
Machine additive is paraffin, stearic acid, oleic acid, zinc stearate, polyvinyl alcohol, one kind in low density polyethylene (LDPE) or at least two groups
Into, and 0.1%~2.0% that the addition of organic additive is W powder and Cu powder gross masses.
3. the manufacturing process of high-density large-area tungsten-copper alloy life slab according to claim 1, it is characterised in that：Above-mentioned step
Rapid 2）Middle W powder, Cu powder and organic additive need to be sufficiently mixed for 24 hours.
4. the manufacturing process of high-density large-area tungsten-copper alloy life slab according to claim 1, it is characterised in that：Above-mentioned step
Rapid 3）The mill speed of middle roll is 0.3m/min~1.5m/min.
5. the manufacturing process of high-density large-area tungsten-copper alloy life slab according to claim 1, it is characterised in that：Above-mentioned step
Rapid 3）Middle roller gap is 0.3mm~0.7mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017106886749 | 2017-08-13 | ||
| CN201710688674 | 2017-08-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108149101A true CN108149101A (en) | 2018-06-12 |
Family
ID=62468868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711132714.8A Pending CN108149101A (en) | 2017-08-13 | 2017-11-15 | A kind of manufacturing process of high-density large-area tungsten-copper alloy life slab |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108149101A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462168A (en) * | 2007-12-18 | 2009-06-24 | 上海大学 | Method for preparing high-density large-area ultrathin tungsten-copper alloy powder green compact |
| CN104226978A (en) * | 2014-05-26 | 2014-12-24 | 上海瑞钼特金属新材料有限公司 | Application of polyvinyl alcohol water solution in metal powder metallurgy forming |
| CN106756376A (en) * | 2016-11-24 | 2017-05-31 | 深圳市圆梦精密技术研究院 | tungsten-copper alloy and its processing method and application |
-
2017
- 2017-11-15 CN CN201711132714.8A patent/CN108149101A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462168A (en) * | 2007-12-18 | 2009-06-24 | 上海大学 | Method for preparing high-density large-area ultrathin tungsten-copper alloy powder green compact |
| CN104226978A (en) * | 2014-05-26 | 2014-12-24 | 上海瑞钼特金属新材料有限公司 | Application of polyvinyl alcohol water solution in metal powder metallurgy forming |
| CN106756376A (en) * | 2016-11-24 | 2017-05-31 | 深圳市圆梦精密技术研究院 | tungsten-copper alloy and its processing method and application |
Non-Patent Citations (1)
| Title |
|---|
| 杨东麟等: "粉末温轧工艺对W-20Cu合金密度和显微组织的影响", 《粉末冶金材料科学与工程》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106498205B (en) | A kind of manufacture method of the CuCr alloys of large scale high-compactness high uniformity | |
| CN101667498B (en) | Preparation method of W-Cu electrical contact | |
| CN103170616B (en) | Molybdenum copper alloy foil sheet and preparation method thereof | |
| CN104630527B (en) | A kind of method preparing copper base diamond composite | |
| CN105063403A (en) | Preparation method of copper matrix graphene alloy | |
| CN105063402A (en) | Preparation method of aluminum base graphene alloy | |
| CN108220703A (en) | A kind of cast Al-Si alloy of graphene and rare earth cooperative reinforcing and preparation method thereof | |
| CN101338389A (en) | Preparation process of rare-earth copper alloy material for preparing integral dispersion copper | |
| CN109536771A (en) | A kind of preparation method of dispersion strengthened copper oxygen sheet alloy | |
| CN110355363B (en) | Preparation method of alumina chromium zirconium copper composite material | |
| CN101293317B (en) | Preparation technique for high-strength high conductivity integral dispersion copper spot-welding electrode | |
| CN106521250A (en) | Novel large-current-carrying heat-resistant aluminum alloy wire and preparation method thereof | |
| CN103567452B (en) | A kind of tungsten-copper alloy preparation of plates method | |
| CN101135011A (en) | New method for preparing AgSnO2 electrical contact material | |
| CN107557704A (en) | A kind of hot forming dies materials and preparation method thereof | |
| CN108913927A (en) | The heat sink method for mixing raw materials of molybdenum-copper, preparation process and product | |
| CN107217168A (en) | A kind of infiltration method zirconium oxide copper composite metal ceramics and preparation method thereof | |
| CN110106419A (en) | A kind of device and method preparing composite material of molybdenum and copper | |
| CN104911383B (en) | Method for preparing Al2O3 dispersion strengthening copper alloy | |
| CN103789592A (en) | Tungsten alloy material and preparation method and application thereof in preparation of molten aluminum filter disc | |
| CN104550979B (en) | A kind of preparation method of molybdenum niobium alloy target plate | |
| CN106191499B (en) | The method that powder metallurgic method prepares silumin | |
| CN103864436B (en) | The aluminium oxide miniature parts prepared based on multiple physical field activated sintering and sintering method | |
| CN105803283A (en) | Nb-Si-Ti-W-Cr alloy bar and production method thereof | |
| CN108149101A (en) | A kind of manufacturing process of high-density large-area tungsten-copper alloy life slab |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180612 |
|
| RJ01 | Rejection of invention patent application after publication |