CN112412287A - Laser cladding-based heat-insulation composite fireproof door core and preparation method thereof - Google Patents
Laser cladding-based heat-insulation composite fireproof door core and preparation method thereof Download PDFInfo
- Publication number
- CN112412287A CN112412287A CN202011207454.8A CN202011207454A CN112412287A CN 112412287 A CN112412287 A CN 112412287A CN 202011207454 A CN202011207454 A CN 202011207454A CN 112412287 A CN112412287 A CN 112412287A
- Authority
- CN
- China
- Prior art keywords
- aluminum alloy
- cladding
- core
- layer
- woven fabric
- 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
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/70—Door leaves
- E06B3/7015—Door leaves characterised by the filling between two external panels
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/70—Door leaves
- E06B3/7015—Door leaves characterised by the filling between two external panels
- E06B2003/703—Door leaves characterised by the filling between two external panels containing a metallic layer
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/70—Door leaves
- E06B3/7015—Door leaves characterised by the filling between two external panels
- E06B2003/7042—Door leaves characterised by the filling between two external panels with a fire retardant layer
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/70—Door leaves
- E06B2003/7049—Specific panel characteristics
- E06B2003/7051—Specific panel characteristics of layered construction involving different materials
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Securing Of Glass Panes Or The Like (AREA)
- Special Wing (AREA)
Abstract
The invention belongs to the technical field of fireproof doors and preparation thereof, and particularly relates to a laser cladding-based heat-insulation composite fireproof door core, which comprises an aluminum alloy middle core, an intermediate layer, a cladding layer and a non-woven fabric edge layer; the middle layers are arranged on two side parts of the aluminum alloy central core, the cladding layers are arranged on the side parts of the middle layers, and the non-woven fabric side layers are compounded on four sides of the aluminum alloy central core, the middle layers and the cladding layers; according to the invention, the nickel-based alloy powder and the silicon carbide are clad by laser on two sides of the aluminum alloy, the non-woven fabric is compounded on four sides of the aluminum alloy, and the effects of heat resistance, light weight and high strength of the nickel-based alloy powder, the silicon carbide and the aluminum alloy are achieved; the invention achieves the effects of light weight, good heat insulation performance and high hardness, and through the simple process of cutting the aluminum alloy central core, preprocessing, cladding the intermediate layer and the cladding layer and compounding the non-woven fabric side layer, the non-woven fabric has strong adhesive absorption, so that the core plate and the door plate of the fireproof door are bonded more firmly, the door plate can be rapidly molded, and the effect of high-efficiency production is achieved.
Description
Technical Field
The invention belongs to the technical field of fireproof doors and preparation thereof, and particularly relates to a laser cladding-based heat-insulation composite fireproof door core and a preparation method thereof.
Background
The existing fireproof door core is heavy in weight, poor in heat insulation performance and hardness, and cannot be efficiently produced, so that the research and development of the laser cladding-based heat insulation composite fireproof door core which is light in weight, good in heat insulation performance, high in hardness and capable of being efficiently produced and the preparation method thereof are urgently needed.
Disclosure of Invention
Technical problem to be solved
The invention provides a laser cladding-based heat-insulating composite fireproof door core which is light in weight, good in heat-insulating property, high in hardness and capable of being produced efficiently and a preparation method thereof.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides a laser cladding-based heat-insulation composite fireproof door core, which is characterized in that: comprises an aluminum alloy central core, a middle layer, a cladding layer and a non-woven fabric side layer; the middle layers are arranged on two side parts of the aluminum alloy central core, the cladding layers are arranged on the side parts of the middle layers, and the non-woven fabric side layers are compounded on four sides of the aluminum alloy central core, the middle layers and the cladding layers;
wherein, the intermediate layer: the paint comprises the following components in parts by mass: 100% nickel base alloy powder;
wherein, the cladding layer: the paint comprises the following components in parts by mass: 40% silicon carbide and 60% nickel base alloy powder.
Further, the thickness of the aluminum alloy central core is 3cm-6cm, the thickness of the middle layer is 0.08-0.15cm, the thickness of the cladding layer is 0.05-0.1cm, and the thickness of the non-woven fabric side layer is 0.08-0.15 cm.
A preparation method of a laser cladding-based heat-insulation composite fireproof door core comprises the following specific steps:
i. cutting the aluminum alloy middle core: obtaining an aluminum alloy raw material, and cutting the aluminum alloy raw material into an aluminum alloy middle core with a corresponding size according to the size of a fireproof door required by a client;
pretreatment: pretreating the surface of the aluminum alloy core, washing the aluminum alloy core for 2-3min by using purified water at normal temperature, and removing impurities on the outer surface of the aluminum alloy core;
cladding of the intermediate layer and the cladding layer: preheating an aluminum alloy central core at the temperature of 100-;
compounding the non-woven fabric side layers: smearing gel on four sides of the aluminum alloy central core, the middle layer and the cladding layer,
and at the moment, directly attaching the non-woven fabric, repeatedly extruding for 10-20 s by using a roller to prepare a non-woven fabric edge layer, and naturally cooling for 2-3min to obtain the door core of the heat-insulation composite fireproof door.
Further, in the step iii, the intermediate layer cladding process parameters are as follows: the laser power is 1600-1800w, the protective gas flow is 800-1000L/h, the scanning speed is 4-6 mm/s, and the spot diameter is 20 mm.
Further, in the step iii, the cladding process parameters of the cladding layer are as follows: the laser power is 2800-.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the nickel-based alloy powder and the silicon carbide are laser-clad on two sides of the aluminum alloy, the non-woven fabric is compounded on four sides of the aluminum alloy, and the SiC is used for preparing a high-grade refractory material, so that the high-grade refractory material is heat-resistant, small in size, light in weight, high in strength and good in energy-saving effect; the nickel-based alloy powder is an alloy powder with wide use amount in the market, and has the advantages of corrosion resistance, oxidation resistance, heat resistance, low-stress abrasive wear resistance and good impact toughness; the aluminum alloy has light weight and high hardness; the invention achieves the effects of light weight, good heat insulation performance and high hardness, and through the simple process of cutting the aluminum alloy central core, preprocessing, cladding the intermediate layer and the cladding layer and compounding the non-woven fabric edge layer, the non-woven fabric has strong adhesive absorption, so that the core plate and the door plate of the fireproof door are bonded more firmly, the door plate can be rapidly molded, and the effect of high-efficiency production is achieved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic view of the door core structure of the present invention.
FIG. 2 is a side view of the structure of FIG. 1 according to the present invention.
Detailed Description
In the technical scheme:
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b): as shown with reference to figures 1-2,
manufacturing the aluminum alloy core with the thickness of 4cm and the intermediate layer with the thickness of 0.08cm, and cladding
The thickness of the layer is 0.05cm, and the thickness of the non-woven fabric side layer is 0.08 cm;
a preparation method of a laser cladding-based heat-insulation composite fireproof door core comprises the following steps,
i. cutting the aluminum alloy middle core: obtaining an aluminum alloy raw material, and cutting the aluminum alloy raw material into an aluminum alloy middle core with a corresponding size according to the size of a fireproof door required by a client;
pretreatment: pretreating the surface of the aluminum alloy core, washing the aluminum alloy core for 3min by using purified water at normal temperature, and removing impurities on the outer surface of the aluminum alloy core;
cladding of the intermediate layer and the cladding layer: preheating an aluminum alloy central core at the temperature of 100 ℃ and 150 ℃, uniformly coating 100% of nickel-based alloy powder on the side part of the aluminum alloy central core by adopting a synchronous powder feeding method, cladding the 100% of nickel-based alloy powder on the side part of the aluminum alloy central core by utilizing a laser cladding process to form an intermediate layer, then, uniformly coating 40% of silicon carbide and 60% of nickel-based alloy powder on the surface of the intermediate layer by adopting the synchronous powder feeding method when the intermediate layer is naturally cooled to the temperature of 200 ℃ and 250 ℃, cladding the 40% of silicon carbide and 60% of nickel-based alloy powder on the outer surface of the intermediate layer by utilizing the laser cladding process to form a cladding layer, and finally, naturally cooling for 30 min;
compounding the non-woven fabric side layers: smearing gel on four sides of the aluminum alloy central core, the middle layer and the cladding layer,
at the moment, directly attaching the non-woven fabric, repeatedly extruding for 10s by using a roller to prepare a non-woven fabric edge layer, and naturally cooling to 2min to obtain the door core of the heat-insulation composite fireproof door;
in the step iii, the intermediate layer cladding process parameters are as follows: laser power is 1600w, protective gas
The flow rate is 800L/h, the scanning speed is 4mm/s, and the diameter of a light spot is 20 mm;
in the step iii, the cladding process parameters of the cladding layer are as follows: the laser power is 2800, the protective gas flow is 800L/h, the scanning speed is 2mm/s, and the spot diameter is 20 mm.
According to the invention, the nickel-based alloy powder and the silicon carbide are laser-clad on two sides of the aluminum alloy, the non-woven fabric is compounded on four sides of the aluminum alloy, and the SiC is used for preparing a high-grade refractory material, so that the high-grade refractory material is heat-resistant, small in size, light in weight, high in strength and good in energy-saving effect; the nickel-based alloy powder is an alloy powder with wide use amount in the market, and has the advantages of corrosion resistance, oxidation resistance, heat resistance, low-stress abrasive wear resistance and good impact toughness; the aluminum alloy has light weight and high hardness; the invention achieves the effects of light weight, good heat insulation performance and high hardness, and through the simple process of cutting the aluminum alloy central core, preprocessing, cladding the intermediate layer and the cladding layer and compounding the non-woven fabric edge layer, the non-woven fabric has strong adhesive absorption, so that the core plate and the door plate of the fireproof door are bonded more firmly, the door plate can be rapidly molded, and the effect of high-efficiency production is achieved.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (5)
1. The utility model provides a fire door core is prevented to adiabatic complex based on laser cladding which characterized in that: comprises an aluminum alloy central core, a middle layer, a cladding layer and a non-woven fabric side layer; the middle layers are arranged on two side parts of the aluminum alloy central core, the cladding layers are arranged on the side parts of the middle layers, and the non-woven fabric side layers are compounded on four sides of the aluminum alloy central core, the middle layers and the cladding layers;
wherein, the intermediate layer: the paint comprises the following components in parts by mass: 100% nickel base alloy powder;
wherein, the cladding layer: the paint comprises the following components in parts by mass: 40% silicon carbide and 60% nickel base alloy powder.
2. The laser cladding-based heat-insulating composite fireproof door core and the preparation method thereof according to claim 1 are characterized in that: the thickness of the aluminum alloy central core is 3cm-6cm, the thickness of the middle layer is 0.08-0.15cm, the thickness of the cladding layer is 0.05-0.1cm, and the thickness of the non-woven fabric side layer is 0.08-0.15 cm.
3. The preparation method of the laser cladding based heat insulation composite fireproof door core according to any one of claims 1-2, wherein: the method comprises the following specific steps:
i. cutting the aluminum alloy middle core: obtaining an aluminum alloy raw material, and cutting the aluminum alloy raw material into an aluminum alloy middle core with a corresponding size according to the size of a fireproof door required by a client;
pretreatment: pretreating the surface of the aluminum alloy core, washing the aluminum alloy core for 2-3min by using purified water at normal temperature, and removing impurities on the outer surface of the aluminum alloy core;
cladding of the intermediate layer and the cladding layer: preheating an aluminum alloy central core at the temperature of 100-;
compounding the non-woven fabric side layers: smearing gel on four sides of the aluminum alloy central core, the middle layer and the cladding layer, directly attaching the non-woven fabric, repeatedly extruding for 10-20 s by using a roller to prepare the non-woven fabric side layer, and naturally cooling for 2-3min to obtain the heat-insulation composite fireproof door core.
4. The preparation method of the laser cladding-based heat-insulating composite fireproof door core of claim 1: in the step iii, the intermediate layer cladding process parameters are as follows: the laser power is 1600-1800w, the protective gas flow is 800-1000L/h, the scanning speed is 4-6 mm/s, and the spot diameter is 20 mm.
5. The preparation method of the laser cladding-based heat-insulating composite fireproof door core of claim 1: in the step iii, the cladding process parameters of the cladding layer are as follows: the laser power is 2800-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011207454.8A CN112412287A (en) | 2020-11-03 | 2020-11-03 | Laser cladding-based heat-insulation composite fireproof door core and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011207454.8A CN112412287A (en) | 2020-11-03 | 2020-11-03 | Laser cladding-based heat-insulation composite fireproof door core and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112412287A true CN112412287A (en) | 2021-02-26 |
Family
ID=74827376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011207454.8A Pending CN112412287A (en) | 2020-11-03 | 2020-11-03 | Laser cladding-based heat-insulation composite fireproof door core and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112412287A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453909A (en) * | 2010-11-02 | 2012-05-16 | 沈阳大陆激光技术有限公司 | Method for manufacturing bimetallic composite board |
| CN102557758A (en) * | 2012-02-04 | 2012-07-11 | 徐林波 | Refractory material product with laser cladding surface layers |
| CN103244028A (en) * | 2013-05-22 | 2013-08-14 | 天津鼎鑫防火材料科技有限公司 | High-temperature resistant fireproof door core plate |
| CN103726048A (en) * | 2014-01-07 | 2014-04-16 | 张翀昊 | Special nickel base alloy powder for continuous wave fiber laser cladding |
| CN104005019A (en) * | 2014-04-29 | 2014-08-27 | 昆明理工大学 | Preparation method of aluminum alloy surface composite coating layer |
| CN105882046A (en) * | 2016-04-07 | 2016-08-24 | 孔德玲 | Production method of reinforced waterproof board and production method of reinforced waterproof decorative board |
| CN108642346A (en) * | 2018-07-10 | 2018-10-12 | 张文霞 | A kind of high fire resistant aluminum alloy construction material of intensity and its production method |
-
2020
- 2020-11-03 CN CN202011207454.8A patent/CN112412287A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453909A (en) * | 2010-11-02 | 2012-05-16 | 沈阳大陆激光技术有限公司 | Method for manufacturing bimetallic composite board |
| CN102557758A (en) * | 2012-02-04 | 2012-07-11 | 徐林波 | Refractory material product with laser cladding surface layers |
| CN103244028A (en) * | 2013-05-22 | 2013-08-14 | 天津鼎鑫防火材料科技有限公司 | High-temperature resistant fireproof door core plate |
| CN103726048A (en) * | 2014-01-07 | 2014-04-16 | 张翀昊 | Special nickel base alloy powder for continuous wave fiber laser cladding |
| CN104005019A (en) * | 2014-04-29 | 2014-08-27 | 昆明理工大学 | Preparation method of aluminum alloy surface composite coating layer |
| CN105882046A (en) * | 2016-04-07 | 2016-08-24 | 孔德玲 | Production method of reinforced waterproof board and production method of reinforced waterproof decorative board |
| CN108642346A (en) * | 2018-07-10 | 2018-10-12 | 张文霞 | A kind of high fire resistant aluminum alloy construction material of intensity and its production method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110665969B (en) | Preparation method of high-performance titanium/steel bimetal composite board | |
| CN106757010B (en) | Preparation method of fiber laser cladding nickel-based nickel-coated tungsten carbide cladding coating | |
| CN104209697B (en) | The preparation method of a kind of laminar titanium aluminum composite plate | |
| CN103866319B (en) | Zr alloy surface prepares the laser cladding method of nickel base heat resistant wear-resistant coating | |
| CN104372196B (en) | A kind of reaction in-situ generates the method for TiC dispersion-strengtherning Cu alloy | |
| CN104342575B (en) | Electrified railway chromium-zirconium-copper contact line and machining process thereof | |
| CN101799099A (en) | Nanometer multiple-layer composite thermal insulation material and preparation method thereof | |
| CN102925825A (en) | Preparation method for continuous fiber reinforced titanium-titanium aluminum hybrid matrix composite material | |
| CN104388927B (en) | Method for preparing high-hardness coating on aluminum alloy surface | |
| CN109576628B (en) | Preparation method of long-side copper plate composite coating of continuous casting crystallizer | |
| CN102205346A (en) | Method for preparing copper-aluminum-copper compound board | |
| CN102886599A (en) | Method for manufacturing multi-layer amorphous alloy and crystal metal composite structure through diffusion welding | |
| CN202764278U (en) | Cold rolling type copper-aluminum composite plate strip | |
| CN112412287A (en) | Laser cladding-based heat-insulation composite fireproof door core and preparation method thereof | |
| CN109943872B (en) | Preparation method of composite coating for protecting Cr-containing stainless steel in molten fluoride salt | |
| CN103409747A (en) | Method for preparing Ni-based WC hard alloy coating and inhibiting cracks and air holes therein | |
| CN103101246A (en) | Foamy carbon/metal-based photothermal composite material and preparation method thereof | |
| CN110358943A (en) | A kind of alterant and carbon nanomaterial coordinate system for aluminum matrix composite method | |
| CN103231057B (en) | The preparation method of Stirling engine regenerator | |
| CN101245461A (en) | Method of producing (FeAl+Cr7C3)/(gamma Fe, Ni) composite coating | |
| CN102400214A (en) | Quartz crucible with composite coating layers for preparing polycrystalline silicon ingot | |
| JP2004273314A (en) | Fuel cell metal separator, manufacturing method of the same, and fuel cell | |
| CN109834278A (en) | The preparation method of fibre reinforced parent metal laminate | |
| CN220099263U (en) | Heat preservation structure for crystal cooling device | |
| CN201962213U (en) | Hard carbon felt insulating cylinder with surface coating |
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: 20210226 |
|
| RJ01 | Rejection of invention patent application after publication |