CN115401217A - Electron beam selective powder bed preheating process parameter development method - Google Patents
Electron beam selective powder bed preheating process parameter development method Download PDFInfo
- Publication number
- CN115401217A CN115401217A CN202211232377.0A CN202211232377A CN115401217A CN 115401217 A CN115401217 A CN 115401217A CN 202211232377 A CN202211232377 A CN 202211232377A CN 115401217 A CN115401217 A CN 115401217A
- Authority
- CN
- China
- Prior art keywords
- preheating
- powder
- parameters
- powder bed
- electron beam
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Plasma & Fusion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a method for developing preheating process parameters of a powder bed in a selective electron beam area, which is characterized by comprising the following steps of: the invention comprises a cold powder experiment and a hot powder experiment, belongs to the technical field of powder bed preheating processes, can quickly find out the optimal powder bed preheating parameters through the cold and hot powder experiments, can effectively reduce the blowing of powder in the actual printing and forming process, has practical value, can quickly find out the powder bed preheating parameters through the cold and hot powder experiments, realizes the stable printing of metal material electron beam selective melting, can quickly and accurately find out the electron beam selective melting and forming preheating parameters, is difficult to blow powder in the actual printing process, can experiment dozens of groups of parameters through one furnace of the cold and hot powder experiments, and can find out the parameters in a relatively short time, thereby reducing the experiment cost and improving the experiment efficiency.
Description
Technical Field
The invention belongs to the technical field of powder bed preheating processes, and particularly relates to a method for developing preheating process parameters of a powder bed in an electron beam selective area.
Background
With the progress of science and technology, the 3D printing technology is widely applied in the fields of aerospace and biomedical science, but refractory metals such as intermetallic compounds cannot be manufactured by a traditional selective laser melting and forming method, and most of the refractory metals are manufactured by a traditional casting method at present, but the casting cost is high and the precision is poor. The selective melting and forming of the electron beam has the advantages of high energy utilization rate, no reflection, high power density, high scanning speed, no pollution in a vacuum environment, low residual stress and the like, is particularly suitable for direct forming of active, refractory and brittle metal materials, and has wide application prospects in the fields of aerospace, biomedical treatment, automobiles, molds and the like. The main factor restricting the wide application of electron beam selective melting is the complex process, especially the powder bed preheating process. The electron beam selective powder bed has more preheating parameters, all the parameters are mutually coupled, and the traditional full-scale test method and the orthogonal method are adopted, so that the workload is large, and a large number of parameters consume a large amount of manpower and material resources. In addition, the traditional method is adopted to heat the substrate to the temperature required by the printing part, and then the test parameters are started, the temperature of the substrate chamber is raised to the high temperature required by the printing part, so that 1 hour is generally spent, a large amount of electric energy and time are consumed, powder blowing can be inhibited under the high-temperature condition, and the risk of powder blowing can be caused when the temperature of the test preheating parameters is reduced in the printing process.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for developing preheating process parameters of a powder bed in a selective area of an electron beam, which can quickly find the preheating parameters of the powder bed through a cold-hot powder experiment and realize the selective melting and stable printing of a metal material in the selective area of the electron beam.
The invention adopts the following technical scheme for solving the technical problems:
a method for developing preheating process parameters of a powder bed in an electron beam selective area comprises a cold powder experiment and a hot powder experiment, and is used for quickly finding the preheating parameters of the powder bed in the cold powder experiment and realizing the melting and stable printing of the metal material in the electron beam selective area;
the cold powder experiment specifically comprises the following steps:
step 1, preparing conditions: removing the thermocouple and the grounding wire, lowering the forming cylinder, adding sufficient powder into the forming cylinder, scraping the powder pile by using a scraper, selecting a process file to be printed, and only keeping a preheating process without a MELT process;
step 2, finding a process forming window:
step 2.1, opening the high-pressure unit, directly pointing an equipment starting button, and starting preheating the powder bed without selecting a preheating substrate option;
step 2.2, adjusting parameters such as starting current, preheating average current, preheating scanning speed, preheating electron beam defocusing amount, preheating branch line number, scanning line spacing and the like;
step 2.3, when the powder blowing phenomenon occurs in the parameter changing process, the base plate is lowered by 1 mm, manual powder taking is carried out, the powder bed is scraped flat, and then the test is continued;
the hot powder test specifically comprises the following steps:
step A, equipment preparation: selecting a printing preparation device according to a normal electron beam;
step B, selecting a file: selecting a process file to be printed, and only reserving a preheating process without a MELT process;
step C, finding a process forming window:
step C1, preheating the powder on the powder bed according to the parameters found in a cold powder experiment after the substrate is preheated to 700-1150 ℃, observing whether the preheated powder bed cracks through an observation window, and increasing preheating current, repetition times and scanning speed parameters until the powder bed cracks if the powder bed does not crack normally;
and step C2, adjusting the preheating parameters according to the printing condition in the subsequent printing process as long as the adjusting parameters do not exceed the process windows of the cold and hot powder experiments.
As a further preferable scheme of the method for developing the preheating process parameters of the powder bed in the electron beam selective area, in the step 1, a certain distance is 40-50mm.
As a further preferable scheme of the method for developing the preheating process parameters of the powder bed in the electron beam selective area, in step 2.2, in the preheating process, the preheating current is increased to the maximum current from the minimum current through a set number of times of repetition, and then the maximum current is kept until the whole heat input reaches the set average current level, and the optimal preheating parameters are found until no powder blowing occurs in the three-layer preheating.
As a further preferable scheme of the method for developing the preheating process parameters of the powder bed in the electron beam selective area, in the step C1, the parameter of the occurrence of the crack is an upper limit parameter of the preheating of the powder bed.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. according to the invention, the optimal powder bed preheating parameter can be rapidly found out through cold and hot powder experiments, and the preheating parameter found out by the method can effectively reduce powder blowing in the actual printing and forming process, so that the method has practical value;
2. according to the invention, when a certain metal material is subjected to selective melting printing by an electron beam, the preheating parameters of the powder bed are difficult to find, and the preheating parameters of the powder bed can be quickly found through a cold and hot powder experiment, so that stable melting printing of the selective melting of the electron beam of the metal material is realized;
3. according to the invention, through an experimental method, the selective melting and forming preheating parameters of the electron beam are quickly and accurately found out, and stable preheating is realized in the actual printing process, and powder blowing is difficult;
4. the invention can test dozens of groups of parameters through one furnace of cold powder and hot powder tests, and finds the parameters in a relatively short time, thereby greatly reducing the test cost and improving the test efficiency.
Drawings
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
FIG. 1 is a flow chart of selective electron beam melting according to the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the electron beam selective melting flow chart includes the processes of searching for powder preheating stability parameters and entity printing;
the method comprises a cold powder experiment and a hot powder experiment, and is used for rapidly finding the preheating parameters of the powder bed of the metal material through the cold powder experiment and realizing the selective melting and stable printing of the metal material electron beam;
the method can quickly find out the optimal preheating parameters of the powder bed through cold and hot powder experiments, and the preheating parameters found out by the method can effectively reduce powder blowing in the actual printing and forming process, so that the method has practical value; according to the invention, when a certain metal material is subjected to selective melting printing by an electron beam, the preheating parameters of the powder bed are difficult to find, and the preheating parameters of the powder bed can be quickly found through a cold and hot powder experiment, so that stable melting printing of the selective melting of the electron beam of the metal material is realized; according to the invention, through an experimental method, the selective melting and forming preheating parameters of the electron beam are quickly and accurately found out, and stable preheating is realized in the actual printing process, and powder blowing is difficult; the invention can test dozens of groups of parameters through one furnace of cold powder and hot powder tests, and finds the parameters in a relatively short time, thereby greatly reducing the test cost and improving the test efficiency.
The cold powder experiment specifically comprises the following steps:
step 1, preparing conditions: removing the thermocouple and the grounding wire, lowering the forming cylinder, and adding sufficient quantity of the molding cylinder
Scraping the powder pile by using a scraper, selecting a process file to be printed, and only keeping a preheating process without a MELT process; the certain distance is 40-50mm.
Step 2, finding a process forming window:
step 2.1, turning on the high-voltage unit, directly pointing an equipment start button, and starting preheating the powder bed without selecting a preheating substrate option;
and 2.2, adjusting parameters such as starting current, preheating average current, preheating scanning speed, defocusing amount of a preheating electron beam, the number of preheating branch lines, scanning line spacing and the like as shown in table 1. In the actual preheating process, the preheating current is increased from the minimum current to the maximum current through the set repetition times, the maximum current is kept until the whole heat input reaches the set average current level, and the optimal preheating parameter is found until no powder blowing occurs in the three-layer preheating.
TABLE 1
Step 2.3, when the powder blowing phenomenon occurs in the parameter changing process, the base plate is lowered by 1 mm, manual powder taking is carried out, the powder bed is scraped flat, and then the test is continued;
the hot powder experiment specifically comprises the following steps:
step A, equipment preparation: selecting a printing preparation device according to a normal electron beam;
step B, selecting a file: selecting a process file to be printed, and only reserving a preheating process without a MELT process;
step C, finding a process forming window:
step C1, preheating the powder on the powder bed according to the parameters found in a cold powder experiment after the substrate is preheated to 700-1150 ℃, observing whether the preheated powder bed cracks through an observation window, and increasing preheating current, repetition times and scanning speed parameters until the powder bed cracks if the powder bed does not crack normally; the parameter for the occurrence of cracks is the upper limit parameter for the preheating of the powder bed.
And step C2, adjusting the preheating parameters according to the printing condition in the subsequent printing process as long as the adjusting parameters do not exceed the process windows of the cold and hot powder experiments.
The solid printing process comprises substrate preheating, powder spreading, powder preheating, solid melting, and post-preheating as shown in fig. 1.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for developing preheating process parameters of a powder bed in a selective electron beam area is characterized by comprising the following steps: the method comprises a cold powder experiment and a hot powder experiment, and is used for rapidly finding the preheating parameters of a powder bed of the metal material through the cold powder experiment and realizing selective melting and stable printing of the metal material by an electron beam;
the cold powder experiment specifically comprises the following steps:
step 1, preparing conditions: removing the thermocouple and the grounding wire, lowering the forming cylinder, adding sufficient powder into the forming cylinder, scraping the powder pile by using a scraper, selecting a process file to be printed, and only keeping a preheating process without a MELT process;
step 2, finding a process forming window:
step 2.1, opening the high-pressure unit, directly pointing an equipment starting button, and starting preheating the powder bed without selecting a preheating substrate option;
step 2.2, adjusting parameters such as starting current, preheating average current, preheating scanning speed, defocusing amount of a preheating electron beam, the number of preheating branch lines, scanning line spacing and the like;
step 2.3, when the powder blowing phenomenon occurs in the parameter changing process, the base plate is lowered by 1 mm, manual powder taking is carried out, the powder bed is scraped flat, and then the test is continued;
the hot powder test specifically comprises the following steps:
step A, equipment preparation: selecting a printing preparation device according to a normal electron beam;
step B, selecting a file: selecting a process file to be printed, and only reserving a preheating process without a MELT process;
step C, finding a process forming window:
step C1, preheating the powder on the powder bed according to the parameters found in a cold powder experiment after the substrate is preheated to 700-1150 ℃, observing whether the preheated powder bed cracks through an observation window, and increasing preheating current, repetition times and scanning speed parameters until the powder bed cracks if the powder bed does not crack normally;
and step C2, adjusting the preheating parameters according to the printing condition in the subsequent printing process as long as the adjusting parameters do not exceed the process windows of the cold and hot powder experiments.
2. The method for developing preheating process parameters of powder bed in selected area by electron beam as claimed in claim 1, wherein: in step 1, the certain distance is 40-50mm.
3. The method for developing preheating process parameters of powder bed in selected area by electron beam as claimed in claim 1, wherein: in step 2.2, in the preheating process, the preheating current is increased to the maximum current from the minimum current through the set repetition times, the maximum current is kept until the whole heat input reaches the set average current level, and the optimal preheating parameter is found until no powder blowing occurs in the three-layer preheating.
4. The method for developing preheating process parameters of the powder bed in the selected area by the electron beam as claimed in claim 1, wherein: in step C1, the parameter for the occurrence of cracks is the upper limit parameter for preheating of the powder bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211232377.0A CN115401217B (en) | 2022-10-10 | 2022-10-10 | Method for developing preheating process parameters of electron beam selective powder bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211232377.0A CN115401217B (en) | 2022-10-10 | 2022-10-10 | Method for developing preheating process parameters of electron beam selective powder bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115401217A true CN115401217A (en) | 2022-11-29 |
| CN115401217B CN115401217B (en) | 2023-07-11 |
Family
ID=84168679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211232377.0A Active CN115401217B (en) | 2022-10-10 | 2022-10-10 | Method for developing preheating process parameters of electron beam selective powder bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115401217B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115533123A (en) * | 2022-12-06 | 2022-12-30 | 西安赛隆增材技术股份有限公司 | Method for forming three-dimensional part through additive manufacturing |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2013245537A1 (en) * | 2013-01-31 | 2014-08-14 | Far Eastern New Century Corporation | Method for producing heat shrinkable polyester film |
| CN107379527A (en) * | 2017-07-25 | 2017-11-24 | 华中科技大学 | A kind of pre-heating mean and device suitable for powdering formula increasing material manufacturing |
| CN108705083A (en) * | 2018-05-31 | 2018-10-26 | 华中科技大学 | A kind of real-time pre-heating system of selective melting powder and method based on multi-laser |
| CN110125398A (en) * | 2019-05-27 | 2019-08-16 | 航发优材(镇江)增材制造有限公司 | A kind of selective laser fusing forming test method suitable for a small amount of metal powder |
| WO2020059184A1 (en) * | 2018-09-19 | 2020-03-26 | 技術研究組合次世代３Ｄ積層造形技術総合開発機構 | Evaluation method, evaluation program, and production method for powder for metal additive manufacturing, information processing device, and metal additive manufacturing device |
| CN111570792A (en) * | 2020-06-16 | 2020-08-25 | 广州赛隆增材制造有限责任公司 | Method for inhibiting powder splashing of powder bed electron beam 3D printing |
| CN112974854A (en) * | 2021-04-28 | 2021-06-18 | 天津清研智束科技有限公司 | Electron beam additive manufacturing device and method |
| CN113329833A (en) * | 2019-01-29 | 2021-08-31 | 弗里曼特有限公司 | Spot preheating |
| GB202113000D0 (en) * | 2021-09-13 | 2021-10-27 | Xaar 3D Ltd | The method for determining a set point for a thermal sensor in an apparatus for the manufacture of 3D objects |
| CN113798515A (en) * | 2021-09-17 | 2021-12-17 | 成都先进金属材料产业技术研究院股份有限公司 | Process method for adjusting and controlling electron beam additive manufacturing alloy structure in real time |
| CN114406288A (en) * | 2022-03-29 | 2022-04-29 | 西安赛隆金属材料有限责任公司 | Control method for graded preheating of powder bed and additive manufacturing device |
| CN114850498A (en) * | 2022-07-05 | 2022-08-05 | 西安赛隆金属材料有限责任公司 | Control method for uniformly preheating powder bed and additive manufacturing device |
| CN115003489A (en) * | 2019-11-22 | 2022-09-02 | 戴弗根特技术有限公司 | Powder bed fusion recoater with heat source for thermal management |
-
2022
- 2022-10-10 CN CN202211232377.0A patent/CN115401217B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2013245537A1 (en) * | 2013-01-31 | 2014-08-14 | Far Eastern New Century Corporation | Method for producing heat shrinkable polyester film |
| CN107379527A (en) * | 2017-07-25 | 2017-11-24 | 华中科技大学 | A kind of pre-heating mean and device suitable for powdering formula increasing material manufacturing |
| CN108705083A (en) * | 2018-05-31 | 2018-10-26 | 华中科技大学 | A kind of real-time pre-heating system of selective melting powder and method based on multi-laser |
| WO2020059184A1 (en) * | 2018-09-19 | 2020-03-26 | 技術研究組合次世代３Ｄ積層造形技術総合開発機構 | Evaluation method, evaluation program, and production method for powder for metal additive manufacturing, information processing device, and metal additive manufacturing device |
| CN113329833A (en) * | 2019-01-29 | 2021-08-31 | 弗里曼特有限公司 | Spot preheating |
| CN110125398A (en) * | 2019-05-27 | 2019-08-16 | 航发优材(镇江)增材制造有限公司 | A kind of selective laser fusing forming test method suitable for a small amount of metal powder |
| CN115003489A (en) * | 2019-11-22 | 2022-09-02 | 戴弗根特技术有限公司 | Powder bed fusion recoater with heat source for thermal management |
| CN111570792A (en) * | 2020-06-16 | 2020-08-25 | 广州赛隆增材制造有限责任公司 | Method for inhibiting powder splashing of powder bed electron beam 3D printing |
| CN112974854A (en) * | 2021-04-28 | 2021-06-18 | 天津清研智束科技有限公司 | Electron beam additive manufacturing device and method |
| GB202113000D0 (en) * | 2021-09-13 | 2021-10-27 | Xaar 3D Ltd | The method for determining a set point for a thermal sensor in an apparatus for the manufacture of 3D objects |
| CN113798515A (en) * | 2021-09-17 | 2021-12-17 | 成都先进金属材料产业技术研究院股份有限公司 | Process method for adjusting and controlling electron beam additive manufacturing alloy structure in real time |
| CN114406288A (en) * | 2022-03-29 | 2022-04-29 | 西安赛隆金属材料有限责任公司 | Control method for graded preheating of powder bed and additive manufacturing device |
| CN114850498A (en) * | 2022-07-05 | 2022-08-05 | 西安赛隆金属材料有限责任公司 | Control method for uniformly preheating powder bed and additive manufacturing device |
Non-Patent Citations (3)
| Title |
|---|
| 岳航宇: "热处理工艺对电子束选区熔化成形TiAl合金显微组织和硬度的影响", 《江苏科技大学学报（自然科学版）》, vol. 036, no. 002, pages 22 - 26 * |
| 张建飞: "电子束熔粉成形的粉末床温度模拟与讨论", 《装备制造技术》, vol. 000, no. 001, pages 33 - 37 * |
| 韩建栋: "粉末预热对电子束选区熔化成形工艺的影响", 《焊接学报》, vol. 029, no. 010, pages 77 - 80 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115533123A (en) * | 2022-12-06 | 2022-12-30 | 西安赛隆增材技术股份有限公司 | Method for forming three-dimensional part through additive manufacturing |
| CN115533123B (en) * | 2022-12-06 | 2023-03-28 | 西安赛隆增材技术股份有限公司 | Method for forming three-dimensional part through additive manufacturing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115401217B (en) | 2023-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Butyagin et al. | Microplasma systems for creating coatings on aluminium alloys | |
| CN111872390B (en) | Method for preparing diamond metal matrix composite material by selective laser melting process | |
| CN104588810B (en) | The welding method of aluminium target material assembly | |
| CN115401217A (en) | Electron beam selective powder bed preheating process parameter development method | |
| KR101324729B1 (en) | Solid electrolyte composition for lithium secondary battery and method of forming the same | |
| CN107900334B (en) | Laser high-flux preparation method based on array type powder distribution | |
| CN109930148B (en) | Method for preparing copper water jacket based on low-pressure cold spraying additive manufacturing technology and powder | |
| CN102208615A (en) | Method for preparing carbon-carbon composite lithium ion battery cathode material | |
| CN105921887B (en) | A kind of device and method based on ultrafast laser manufacture three-dimensional structure battery | |
| CN109321766A (en) | A kind of aluminium-air cell anode material and preparation method thereof | |
| CN105908021A (en) | Pure aluminum cathode foil for capacitors and manufacturing method thereof | |
| CN108406029B (en) | Titanium-based composite brazing filler metal and preparation and brazing methods thereof | |
| CN113042753A (en) | Method for reducing SLM forming nickel-based superalloy cracks and improving mechanical property | |
| CN116618680A (en) | Laser Selective Melting Printing Method and Formed Workpiece | |
| CN108406223A (en) | A kind of welding repair method and device of thin wall component | |
| CN108220953A (en) | A kind of Laser Surface Treatment method for improving thermal barrier coating heat and corrosion resistant performance | |
| CN114525566B (en) | Surface micro-arc oxidation-high-temperature oxidation method for copper and copper alloy | |
| CN110184552A (en) | A kind of profound hypothermia manufacturing process of tough cathode | |
| CN114142101A (en) | Method for preparing LATP solid electrolyte with blocking electrode at low temperature in one step | |
| CN105177511B (en) | A kind of negative thermal expansion material Sc2Mo3O12The preparation method of film | |
| CN111193010A (en) | Lithium battery composite material | |
| Guo et al. | [Retracted] Mo‐Si‐B Alloy Formed by Optional Laser Melting Process | |
| CN107739856B (en) | A kind of preparation method of Ti-Y alloy block nano material | |
| CN110872661A (en) | High-temperature-resistant titanium alloy plate and preparation method thereof | |
| CN105810531A (en) | Preparation method of scandia-doped dispenser cathode material with turned surface |
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 |