CN109971994A - A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique - Google Patents
A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique Download PDFInfo
- Publication number
- CN109971994A CN109971994A CN201910408559.0A CN201910408559A CN109971994A CN 109971994 A CN109971994 A CN 109971994A CN 201910408559 A CN201910408559 A CN 201910408559A CN 109971994 A CN109971994 A CN 109971994A
- Authority
- CN
- China
- Prior art keywords
- copper
- degree
- voltage motor
- melting
- alloy
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/08—Alloys based on copper with lead as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Windings For Motors And Generators (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
It is copper-based from cold material and its technique that the invention discloses a kind of 200-300 degree high-voltage motor heat transmissions.By weight percentage, the composition of alloy are as follows: Mo:0.2-0.5wt.%, Ga:0.4-0.8wt.%, In:3.0-5.0wt.%, Co:2.0-3.0wt.%, V:1.0-1.5wt.%, Sb:4.0-5.0wt.%, Pb:8.0-10.0wt.%, Te:0.2-0.3wt.%, surplus are copper.The material provides the brand-new solution in a kind of materialogy for the extreme dissipation of high-voltage motor, that is, carries out high-end heat dissipation from coolant mechanism using material.Simple with process due to smelting, which can also obtain great social value and economic value while solving industry problems.
Description
Technical field
The present invention relates to technical field of alloy, specifically, being related to an Albatra metal.
Background technique
The power of motor is determined by the product of voltage and current.When low voltage motor power increase to a certain extent after
(such as 300KW/380V), since electric current is limited by the ability to bear of conducting wire and cannot be further increased.If obtained bigger
The motor of output power must just be realized using higher voltage.High-voltage motor refers to voltage rating in the electricity of 1000V or more
Machine, usually used high voltage are the voltages such as 6000V and 10000V.
The characteristics of high-voltage motor, clearly, in addition to high-power feature, can also have the very strong energy absorbed impact
Power.In general, high-voltage motor can be divided into: high voltage synchronous machine；High-voltage asynchronous motor；High-voltage asynchronous wound-rotor motor；
High pressure squirrel-cage motor etc..The application range of high-voltage motor is very extensive, can be used for that different machinery is driven to be used.Such as pressure
Contracting machine, water pump, crusher, stock-removing machine, Transport Machinery and other equipment, for mine, mechanical industry, petrochemical industry, hair
It is used as prime mover in the various industry such as motor.
High-voltage motor is big due to power, it is necessary to install very effective radiator.And relevant mechanism must height
Intelligence, can give warning in advance reduce loss.In general, the stator and bearing in high-voltage motor hold very much at work
Easily fever, if heat dissipation is not in time or radiating efficiency is not up to standard, it is easy to due to the bad stator for leading to high-voltage motor that radiates
It is in temperature exceeding standard with bearing, causes equipment damage.So the cooling requirements grade of high-voltage motor is very high.In addition, also
Further requirement, such as accidental internal short-circuit etc. may be proposed to heat dissipation due to the instantaneous generation of hot-fluid greatly.
Common heat dissipation is divided into active heat removal and passive heat dissipation.Active heat removal is exactly the material benefit using high thermal conductivity coefficient
The temperature gradient that the mount of using heat generates carries out heat transfer from inside to outside, thus by the heat derives generated in system into environment
It goes.Passive heat dissipation usually improves the heat derives of radiator portion using external mechanisms such as fans.Presently, passively radiate skill
Art is highly developed, very small in the space that the field is promoted.In comparison, pass through advanced design of material skill
It has been current the main direction of development that art, which carries out highly efficient active heat removal,.
Traditional active heat removal, through frequently with aluminium alloy and copper alloy.The heat dissipation performance of both materials, from traditional material
From the perspective of without very big room for promotion.In addition, although can be by the heat dissipation using the preparation of both materials
Device carries out shape optimum and power ascension, but for the radiating requirements of high-voltage motor, obtaining promotion far can not
Meets the needs of estimated.Thus, develop a kind of high-voltage motor active heat removal new alloy material be current industrial circle urgently
Problem to be solved.
For aluminium alloy, copper alloy is due to having more extensive use in field of radiating with higher heat transfer coefficient
On the way.Presently, the research and development and industrialization to high-voltage motor heat sink material have been carried out both at home and abroad.But these materials
Traditional alloy material range is still belonged to, that is, improves the thermal coefficient of material by the suitable alloying element of addition.It is this
Existing mentality of designing plays a good role in the heat dissipation performance under promoting high-voltage motor and usually working.But work as height
When thering is instantaneous big hot-fluid to generate in Medium-voltage Motor, such as internal short-circuit or the localized hyperthermia as caused by internal arc, extremely short
Apparent cooling effect can not be shown in time.In order to overcome these industry problems, this patent provides a kind of high-voltage electricity
Machine heat transmission is copper-based from coolant and its technique.
Summary of the invention
The purpose of the present invention is to overcome the deficiency in the prior art, and it is copper-based to provide a kind of 200-300 degree high-voltage motor heat transmission
From cold material and its technique.In the cooling procedure of melt, which is divided into two kinds since the spinodal decomposition of liquid phase has occurred
The different liquid of ingredient, both subsequent liquid cooleds form high-melting-point phase and low melting point phase.In the course of work of motor,
The generation meeting of big hot-fluid in short-term becomes the liquid being wrapped in the high-melting-point phase of skeletal like gold so that low melting point mutually melts
Belong to, constitute this patent from cooling effect.Meanwhile the liquid phase that the material is formed can carry out nature in infusible skeleton
Convection current and the efficiency for further increasing heat dissipation.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique.By weight percentage, the composition of alloy
Are as follows: Mo:0.2-0.5wt.%, Ga:0.4-0.8wt.%, In:3.0-5.0wt.%, Co:2.0-3.0wt.%, V:1.0-1.5wt.%,
Sb:4.0-5.0wt.%, Pb:8.0-10.0wt.%, Te:0.2-0.3wt.%, surplus are copper.
A kind of above-mentioned copper-based preparation and application from cold material of 200-300 degree high-voltage motor heat transmission, including it is as follows
The step of :(a) the weighing of raw material ingredient: is carried out according to mass percent as above；(b) it smelts: using the non-real of argon gas protection
Empty induction melting furnace carries out melting, and wherein crucible uses graphite crucible；10 minutes are kept the temperature in 1150-1200 degree and are stirred using electromagnetism
It mixes and alloy melt is sufficiently stirred, then carry out swage tool and cast, and be rapidly cooled using water cooling;(c) destressing
Annealing: 2.0-2.5 hours are kept the temperature in 200-250 degree in the antivacuum furnace of argon gas protection.
Compared with prior art, the invention has the following beneficial effects:
(1) high-voltage motor makes the demand to high-end heat dissipation very vigorous due to the characteristics of itself works, in design phase
The ingredient of alloy, tissue and performance must be designed when the heat sink material of pass according to the working condition under maximum conditions.By right
The regulation of microstructure is to improve the limit heat dissipation performance under operating condition.Currently used high heat-conducting copper alloy, was using
It is to carry out heat radiation performance by high heat transfer coefficient in journey, this is highly effective under the normal running conditions of high-voltage motor
, but a large amount of heat can not be absorbed or passed out under the situation of big hot-fluid in short-term in a short time when motor faces.
From the perspective of materialogy, at home and abroad there is no the copper-based heat dissipation alloy materials of a property innovation at present.Thus this patent
Proceeding from the reality, it is a kind of for the copper-based from coolant and its technique of high-voltage motor to propose.
(2) material consists of two parts, and a portion is high-melting-point phase, and another part is low melting point phase.This two
It is mutually that the liquid phase for two kinds of heterogeneities that spinodal decomposition generates occurs during cooling by liquid phase and is cooled into respectively.
Under the normal operating temperature of high-voltage motor, high-melting-point can't mutually occur fusing and exist in the material as skeleton.Meanwhile
Low melting point can occur to melt in the case where mutually generating high temperature for a short time stream in high-voltage motor and become can be in high-melting-point skeleton phase
The liquid metal of middle flowing.Low melting points of these flowings mutually can not only absorb a large amount of heat during fusing, also can be by
The efficiency of heat transfer is further speeded up in the performance (high heat transfer coefficient and the free convection generated due to temperature difference) of fluid.
(3) alloy material of present patent application protection, the melting range of liquid phase are 860-950 degree.When the liquid phase is cold
But spinodal decomposition occurs during in the two-phase that generates, wherein the melting range of high-melting-point phase is 650-800 degree, and low melting point
The melting range of phase is 205-280 degree.Meanwhile after solidification, the volume fraction that high-melting-point mutually accounts for is 75-80%.Thus in high pressure
In motor work, even if these high-melting-points are mutually used as skeleton after low melting point is mutually melted due to the generation of big hot-fluid in short-term
The generation of side leakage can be effectively prevented with the liquid metal (namely low melting point phase) of fully wrapped around firmly these fusings.
(4) due to having carried out the optimization in materialogy, low melting point mutually has very excellent fusing hot (28-32kJ/mol).?
High-voltage motor can be cracking very big by these heats in the case where generating big hot-fluid due to short circuit or induced current etc.
Degree sponges, to further decrease local temperature.The skeleton phase of the material, that is, high-melting-point phase have very
Excellent heat transfer property (heat transfer coefficient is 300-320 W/ (mK)).Thus after low melting point mutually melts, these skeletons are mutually gone back
It can be used as the export system that the hot-fluid big in short-term generated in system is exceedingly fast by the channel of high thermal conductivity.This mentality of designing is that this is special
The core content of benefit, and the working mechanism from coolant.
(5) in casting process, which is 1150-1200 degree, and the melting temperature of the alloy is
860-950 degree.Thus in the temperature-fall period of casting, which will not occur local rapid cooling and make two liquid phase hairs
It is estranged from.This ensure that in finally obtained tissue that high-melting-point phase with low melting point is mutually equally distributed on microcosmic.In addition, should
Material can overcome conventional cast copper alloy hot cracking tendency in casting big completely, cast hole and loose obvious and waste product
The technical problems such as material and slag charge reuse difference.It is simple with process due to smelting, existing production equipment can be made full use of
And tool.After industrialization, apparent economic benefit and social benefit can also be brought due to can solve industry problem.
Specific embodiment
Embodiment 1
A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique.By weight percentage, the composition of alloy
Are as follows: Mo:0.3wt.%, Ga:0.4wt.%, In:3.2wt.%, Co:2.1wt.%, V:1.4wt.%, Sb:4.5wt.%, Pb:
8.2wt.%, Te:0.2wt.%, surplus are copper.
A kind of above-mentioned copper-based preparation and application from cold material of 200-300 degree high-voltage motor heat transmission, including it is as follows
The step of :(a) the weighing of raw material ingredient: is carried out according to mass percent as above；(b) it smelts: using the non-real of argon gas protection
Empty induction melting furnace carries out melting, and wherein crucible uses graphite crucible；10 minutes are kept the temperature at 1150 degree and utilize electromagnetic agitation will
Alloy melt is sufficiently stirred, and then carries out swage tool and is cast, and is rapidly cooled using water cooling;(c) stress relief annealing:
2.0 hours are kept the temperature at 200 degree in the antivacuum furnace of argon gas protection.
The fusing point of its liquid phase of the alloy material is 890 degree.When in cooling procedure spinodal decomposition occurs for the liquid phase and generate
Two-phase in, wherein the fusing point of high-melting-point phase be 720 degree, and the fusing point of low melting point phase be 280 degree.Meanwhile after solidification, Gao Rong
The volume fraction that point mutually accounts for is 75%.Thus high-voltage motor work in, even if low melting point mutually due to the generation of big hot-fluid in short-term and
After melting, these high-melting-points are mutually used as skeleton can be with liquid metal (the namely eutectic of fully wrapped around firmly these fusings
Point phase), effectively prevent the generation of side leakage.Low melting point mutually has very excellent fusing hot (28kJ/mol).The material
Skeleton phase, that is, high-melting-point phase, with very excellent heat transfer property (heat transfer coefficient is 300W/ (mK)).Thus low
After fusing point mutually melts, the channel that these skeletons are mutually also used as high thermal conductivity is led what the hot-fluid big in short-term generated in system was exceedingly fast
System out.
Embodiment 2
A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique.By weight percentage, the composition of alloy
Are as follows: Mo:0.4wt.%, Ga:0.7wt.%, In:4.8wt.%, Co:2.6wt.%, V:1.4wt.%, Sb:4.5wt.%, Pb:
9.0wt.%, Te:0.3wt.%, surplus are copper.
A kind of above-mentioned copper-based preparation and application from cold material of 200-300 degree high-voltage motor heat transmission, including it is as follows
The step of :(a) the weighing of raw material ingredient: is carried out according to mass percent as above；(b) it smelts: using the non-real of argon gas protection
Empty induction melting furnace carries out melting, and wherein crucible uses graphite crucible；10 minutes are kept the temperature at 1150 degree and utilize electromagnetic agitation will
Alloy melt is sufficiently stirred, and then carries out swage tool and is cast, and is rapidly cooled using water cooling;(c) stress relief annealing:
2.0 hours are kept the temperature at 210 degree in the antivacuum furnace of argon gas protection.
The fusing point of its liquid phase of the alloy material is 920 degree.When in cooling procedure spinodal decomposition occurs for the liquid phase and generate
Two-phase in, wherein the fusing point of high-melting-point phase be 760 degree, and the fusing point of low melting point phase be 250 degree.Meanwhile after solidification, Gao Rong
The volume fraction that point mutually accounts for is 79%.Thus high-voltage motor work in, even if low melting point mutually due to the generation of big hot-fluid in short-term and
After melting, these high-melting-points are mutually used as skeleton can be with liquid metal (the namely eutectic of fully wrapped around firmly these fusings
Point phase), effectively prevent the generation of side leakage.Low melting point mutually has very excellent fusing hot (31kJ/mol).The material
Skeleton phase, that is, high-melting-point phase, with very excellent heat transfer property (heat transfer coefficient is 310W/ (mK)).Thus low
After fusing point mutually melts, the channel that these skeletons are mutually also used as high thermal conductivity is led what the hot-fluid big in short-term generated in system was exceedingly fast
System out.
Embodiment 3
A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique.By weight percentage, the composition of alloy
Are as follows: Mo:0.3wt.%, Ga:0.5wt.%, In:3.8wt.%, Co:2.6wt.%, V:1.3wt.%, Sb:4.5wt.%, Pb:
8.6wt.%, Te:0.2wt.%, surplus are copper.
A kind of above-mentioned copper-based preparation and application from cold material of 200-300 degree high-voltage motor heat transmission, including it is as follows
The step of :(a) the weighing of raw material ingredient: is carried out according to mass percent as above；(b) it smelts: using the non-real of argon gas protection
Empty induction melting furnace carries out melting, and wherein crucible uses graphite crucible；10 minutes are kept the temperature at 1150 degree and utilize electromagnetic agitation will
Alloy melt is sufficiently stirred, and then carries out swage tool and is cast, and is rapidly cooled using water cooling;(c) stress relief annealing:
2.0 hours are kept the temperature at 210 degree in the antivacuum furnace of argon gas protection.
The fusing point of its liquid phase of the alloy material is 900 degree.When in cooling procedure spinodal decomposition occurs for the liquid phase and generate
Two-phase in, wherein the fusing point of high-melting-point phase be 740 degree, and the fusing point of low melting point phase be 240 degree.Meanwhile after solidification, Gao Rong
The volume fraction that point mutually accounts for is 78%.Thus high-voltage motor work in, even if low melting point mutually due to the generation of big hot-fluid in short-term and
After melting, these high-melting-points are mutually used as skeleton can be with liquid metal (the namely eutectic of fully wrapped around firmly these fusings
Point phase), effectively prevent the generation of side leakage.Low melting point mutually has very excellent fusing hot (29kJ/mol).The material
Skeleton phase, that is, high-melting-point phase, with very excellent heat transfer property (heat transfer coefficient is 310W/ (mK)).Thus low
After fusing point mutually melts, the channel that these skeletons are mutually also used as high thermal conductivity is led what the hot-fluid big in short-term generated in system was exceedingly fast
System out.
Claims (2)
1. a kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique, it is characterised in that by weight percentage
Meter, the chemical component of alloy are as follows: Mo:0.2-0.5wt.%, Ga:0.4-0.8wt.%, In:3.0-5.0wt.%, Co:2.0-
3.0wt.%, V:1.0-1.5wt.%, Sb:4.0-5.0wt.%, Pb:8.0-10.0wt.%, Te:0.2-0.3wt.%, surplus are copper.
2. a kind of copper-based smelting and processing side from cold material of 200-300 degree high-voltage motor heat transmission according to claim 1
Method, characterized by comprising the steps of: (a) ingredient: the weighing of raw material is carried out according to mass percent as above；(b) it smelts:
Melting is carried out using the antivacuum induction melting furnace of argon gas protection, wherein crucible uses graphite crucible；It is kept the temperature in 1150-1200 degree
10 minutes and alloy melt is sufficiently stirred using electromagnetic agitation, then carries out swage tool and is cast, and carried out using water cooling
It is quickly cooled down;(c) 2.0-2.5 hours stress relief annealing: are kept the temperature in 200-250 degree in the antivacuum furnace of argon gas protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910408559.0A CN109971994A (en) | 2019-05-16 | 2019-05-16 | A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910408559.0A CN109971994A (en) | 2019-05-16 | 2019-05-16 | A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109971994A true CN109971994A (en) | 2019-07-05 |
Family
ID=67073809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910408559.0A Pending CN109971994A (en) | 2019-05-16 | 2019-05-16 | A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109971994A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000063968A (en) * | 1998-08-21 | 2000-02-29 | Kobe Steel Ltd | Copper alloy for electrical and electronic parts |
| EP1674587A1 (en) * | 2004-12-24 | 2006-06-28 | Kabushiki Kaisha Kobe Seiko Sho | Copper alloy having bendability and stress relaxation property |
| CN1930314A (en) * | 2004-03-12 | 2007-03-14 | 住友金属工业株式会社 | Copper alloy and process for producing the same |
| CN108866382A (en) * | 2018-08-23 | 2018-11-23 | 广州宇智科技有限公司 | A kind of green Riamb's alloy of the lead-free and mercury-free Tibet figure of buddha having spinodal decomposition feature |
-
2019
- 2019-05-16 CN CN201910408559.0A patent/CN109971994A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000063968A (en) * | 1998-08-21 | 2000-02-29 | Kobe Steel Ltd | Copper alloy for electrical and electronic parts |
| CN1930314A (en) * | 2004-03-12 | 2007-03-14 | 住友金属工业株式会社 | Copper alloy and process for producing the same |
| EP1674587A1 (en) * | 2004-12-24 | 2006-06-28 | Kabushiki Kaisha Kobe Seiko Sho | Copper alloy having bendability and stress relaxation property |
| CN108866382A (en) * | 2018-08-23 | 2018-11-23 | 广州宇智科技有限公司 | A kind of green Riamb's alloy of the lead-free and mercury-free Tibet figure of buddha having spinodal decomposition feature |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106884107B (en) | A kind of liquid metal thermal interface material with anti-molten characteristic and preparation method thereof | |
| CN106929733B (en) | A kind of compound liquid metal thermal interface material of foamed aluminium | |
| CN105609155B (en) | A kind of high-conductivity hard aluminum wire monofilament and preparation method thereof | |
| CN108359853A (en) | A kind of high heat conduction aluminium alloy and preparation method thereof | |
| CN106244874B (en) | A kind of dedicated heat-resisting aluminium alloy of high-speed EMUs gear case body and preparation method thereof | |
| CN101724771A (en) | Al-Mg-Si aluminium alloy material for pressed module heat radiator and machining process thereof | |
| CN107542629A (en) | A kind of cooling device and wind power generating set for wind power generating set | |
| CN107052308B (en) | A kind of liquid metal thermal interface material that foam copper is compound | |
| CN109234553A (en) | A kind of Al-Zr-Sc-B heat-resisting alloy monofilament and preparation method thereof | |
| CN111304489A (en) | Preparation and processing method of copper alloy plate strip for vapor chamber | |
| CN107083509B (en) | For the combined type liquid metal thermal interface material of IGBT heat dissipations | |
| CN109971994A (en) | A kind of 200-300 degree high-voltage motor heat transmission is copper-based from cold material and its technique | |
| CN109943748A (en) | A kind of 300-400 degree high-voltage motor heat transmission is copper-based from cold material and its technique | |
| CN109943747A (en) | A kind of 100-200 degree high-voltage motor heat transmission is copper-based from cold material and its technique | |
| CN103305714A (en) | Grain refiner for aluminum silicon alloy and method of refining aluminum silicon alloy | |
| CN109763024A (en) | A kind of cladded type 80-120 degree heat transmission tinbase liquid metal material | |
| CN109825751A (en) | A kind of high thermal conductivity strong mechanical performance magnesium alloy materials and preparation method thereof | |
| CN114150194A (en) | High-thermal-conductivity modified aluminum alloy material, preparation method and 5G communication equipment cavity | |
| CN104313426A (en) | Alkaline-earth element modified heat-resistant magnesium alloy and preparation method thereof | |
| CN211063461U (en) | Motor for sand making machine convenient to control temperature rise | |
| Geng et al. | Design of cooling system for high torque density permanent magnet synchronous motor based on heat pipe | |
| CN1411932B (en) | Ring initial crystal semi-solid metal or alloy slurry directly-forming method and device | |
| CN110387490A (en) | A kind of high thermal conductivity cast Al-Si alloy and preparation method thereof | |
| CN109763023A (en) | A kind of cladded type 120-160 degree heat transmission tinbase liquid metal material | |
| CN109759740A (en) | A kind of high thermal conductivity solder suitable for power semiconductor device package |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190705 |