CN109296643A - A kind of double-level-metal composite material and preparation method applied to sliding bearing - Google Patents
A kind of double-level-metal composite material and preparation method applied to sliding bearing Download PDFInfo
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- CN109296643A CN109296643A CN201811445551.3A CN201811445551A CN109296643A CN 109296643 A CN109296643 A CN 109296643A CN 201811445551 A CN201811445551 A CN 201811445551A CN 109296643 A CN109296643 A CN 109296643A
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- tin
- acieral
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- composite material
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/121—Use of special materials
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/003—Alloys based on aluminium containing at least 2.6% of one or more of the elements: tin, lead, antimony, bismuth, cadmium, and titanium
-
- 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
- C22C9/01—Alloys based on copper with aluminium as the next major constituent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/122—Multilayer structures of sleeves, washers or liners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/14—Special methods of manufacture; Running-in
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2204/00—Metallic materials; Alloys
- F16C2204/10—Alloys based on copper
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2204/00—Metallic materials; Alloys
- F16C2204/20—Alloys based on aluminium
- F16C2204/22—Alloys based on aluminium with tin as the next major constituent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2204/00—Metallic materials; Alloys
- F16C2204/30—Alloys based on one of tin, lead, antimony, bismuth, indium, e.g. materials for providing sliding surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/24—Shaping by built-up welding
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The present invention relates to a kind of double-level-metal composite material and preparation methods applied to sliding bearing, double-level-metal composite material bearing bed is made of copper alloy, antifriction alloy layer is made of middle high tin acieral, wherein, the content of tin element is 10wt%~50wt% in middle high tin acieral, the sum of mass percentage of aluminium element and tin element >=90%, aluminium element and tin element are main alloy element, and in high tin acieral be multicomponent alloy；Preparation method includes: to prepare bearing bed copper alloy as required and processed；Welding wire is made in middle high tin acieral；Using the welding wire built-up welding to copper alloy surface as antifriction alloy layer, the double-level-metal composite material applied to sliding bearing is obtained.Double-level-metal composite material of the invention has very high bond strength, and copper alloy has good fatigue strength, thermal conductivity and corrosion resistance, and middle high tin acieral has good fatigue strength, anti-bite and embedding hiding.
Description
Technical field
The present invention relates to a kind of double-level-metal composite material and preparation methods applied to sliding bearing specifically to relate to
And a kind of copper alloy is answered with middle high tin acieral by the combined double-level-metal applied to sliding bearing of built-up welding
Condensation material and preparation method thereof.
Background technique
Sliding bearing is the important spare part of rotor dynamic system, is played to the normal operation of industrial equipment extremely important
Effect.Heavily loaded field especially harsher in operating condition, to the mechanical performance of material for sliding bearing, more stringent requirements are proposed.
The mild steel being applied has limitation by the double-level-metal composite material in conjunction with centrifugal casting technique with babbit,
Its fatigue strength, bond strength, wearability, temperature tolerance and thermal conductivity are unable to satisfy harsher operating condition.It has been applied
Mild steel has limitation by the double-level-metal composite material in conjunction with bead-welding technology with babbit, and bond strength is shown
Write and improve, but its wearability, heat resistance are unable to satisfy the requirement of harsher operating condition, and babbit fatigue strength with
The raising of temperature have very big decline, heating conduction is also restrained in the application.The mild steel and copper being applied
The double-level-metal composite material that alloy is combined by bead-welding technology has limitation, with very poor anti-bite and embedding hiding,
It is easy occlusion or scratches work shaft, work shaft is caused to scrap the large-scale failure of even equipment.
Summary of the invention
For the defects in the prior art, it is multiple that the object of the present invention is to provide a kind of double-level-metals applied to sliding bearing
Condensation material and preparation method thereof.
The purpose of the present invention is achieved through the following technical solutions:
The present invention relates to a kind of double-level-metal composite material applied to sliding bearing, the double-level-metal composite material packets
The antifriction alloy layer for including bearing bed and being compounded on the bearing bed；The bearing bed is copper alloy layer, the antifriction alloy layer
For middle high tin acieral layer；In middle high tin acieral the mass percentage of tin element be 10%~50%, aluminium element with
The sum of mass percentage of tin element >=90%, aluminium element and tin element are main alloy element.When aluminium member in acieral
The sum of element and the mass percentage of tin element >=90%, and the mass percentage < 10% of tin element, belong to low tin aluminium base
Alloy scope, anti-bite and embedding hiding property are poor, when being used for sliding bearing antifriction alloy layer, need to increase in antifriction alloy layer surface
Coating increases technical process and cost to improve the anti-bite and embedding hiding of material for sliding bearing.When aluminium member in acieral
The sum of element and the mass percentage of tin element >=90%, and the mass percentage > 50% of tin element, it is not belonging to aluminium base conjunction
Golden scope, material is excessively soft, is not suitable for material for sliding bearing.When the mass percentage of tin element in mock silver is 10%
~50%, and the sum of mass percentage of aluminium element and tin element is less than 90%, then essential element removes aluminium element and tin element
Except, it may include other elements, be not belonging to high tin acieral scope in the present invention.
Preferably, the copper alloy of the copper alloy layer includes that brass, Allen's metal, tin bronze, aluminium bronze, silicon bronze or beryllium are green
Copper.
Preferably, the middle high tin acieral is multicomponent alloy.
Preferably, the middle high tin acieral also contains high tin acieral mechanical performance in one or more kinds of enhancings
Other chemical elements.
Preferably, the mechanical performance include yield strength, it is fatigue strength, bearing capacity, impact resistance, wearability, resistance to
Corrosivity, anti-bite, embedding hiding property, antifriction quality, thermal expansion coefficient, hardness, toughness, elasticity, plasticity, temperature tolerance, thermal conductivity, oleophylic
One of property is several.
Preferably, the middle high tin acieral also contains copper, nickel, silicon, iron, manganese, titanium, lead, chromium, zinc, magnesium, silver, indium, lithium
And one or more of rare earth element.The adding purpose of above-mentioned element is high tin acieral mechanicalness in enhancing
Energy.
It is furthermore preferred that the middle high tin acieral contains one or more of copper, nickel, silicon.
The invention further relates to a kind of preparation methods of the double-level-metal composite material of aforementioned any one, and the method includes such as
Lower step:
S1, prepare bearing bed copper alloy and process, make the table for needing to carry out built-up welding compound crown tin aluminum-based alloy material
Surface roughness reaches Ra0.01~Ra3.2；
S2, middle high tin acieral welding wire is made in middle high tin acieral；
S3, need to carry out built-up welding compound crown tin aluminium base for what middle high tin acieral welding wire built-up welding to step S1 processed
The copper alloy surface of alloy material is as antifriction alloy layer to get the double-level-metal composite material.
Preferably, step S1 further includes the greasy dirt on the good copper alloy removal surface of surface cleaning and the step of finely ground particles
Suddenly.
Preferably, step S2 further includes high tin acieral welding wire surface oil stain and finely ground particles in cleaning removal.
Preferably, in step S3, the method that the built-up welding uses is oxy-acetylene flame weldering, argon arc welding, cold metal transfer weldering
One of.
Sliding bearing made of aforementioned described in any item double-level-metal composite materials, institute are utilized the invention further relates to a kind of
Stating sliding bearing includes radial plain bearing, thrust slide bearing and integrated radial plain bearing and thrust slide bearing function
Sliding bearing.
Preferably, the sliding bearing is fixed sliding bearing or tilting bush formula sliding bearing.
Compared with the existing double-level-metal composite material and preparation method applied to sliding bearing, the present invention has as follows
The utility model has the advantages that
1. copper alloy of the present invention and middle high tin acieral all have excellent heating conduction, sliding bearing can be worked
The heat generated in the process conducts, avoid due to thermal expansion cause sliding bearing and work shaft locking, while avoid by
Lead to high temperature in a large amount of accumulated heats to cause sliding bearing and work shaft soldering, that is, kills；The excellent heating conduction of the present invention
Particularly suitable for generating the heavily loaded field of a large amount of sliding friction heats.
2. high tin acieral and copper alloy are combined by bead-welding technology in the present invention, have very high combination strong
Degree so that in high tin acieral during the work time can be firmly in conjunction in copper alloy surface as antifriction alloy layer；This
Excellent bond strength is invented particularly suitable for heavily loaded field.
3. present invention tin acieral high in copper alloy surface built-up welding, can make full use of the excellent of middle high tin acieral
Different anti-bite, embedding hiding property and fatigue strength.
Detailed description of the invention
It is described referring to the following drawings to made by non-limiting embodiment by reading, other feature of the invention, purpose
It will be become more apparent upon with advantage:
Fig. 1 is the double-level-metal composite material schematic diagram in the present invention；Wherein, 1 is bearing bed, and 2 be antifriction alloy layer.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Obviously, described specific embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.It is further that following embodiment will be helpful to those skilled in the art
Understand the present invention, but the invention is not limited in any way.It should be pointed out that those skilled in the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to protection model of the invention
It encloses.
Embodiment 1
The present embodiment is related to a kind of double metallic composite material, as shown in Figure 1, the double metallic composite material includes bearing bed
1 and antifriction alloy layer 2 compound thereon；Double metallic composite material bearing bed 1 is made of aluminium bronze, the matter of aluminium bronze essential element
Amount percentage composition is 85% copper, 10.0% aluminium element, 3.0% ferro element, 1.5% manganese element.Antifriction alloy
Layer 2 is made of middle high tin acieral, aluminium element that the mass percentage of middle high tin acieral essential element is 78%,
20% tin element, 1.0% copper.
The double-level-metal composite material and preparation method thereof applied to sliding bearing of the present embodiment:
The first step prepares bearing bed aluminum-bronze material and is processed, and the surface roughness that need to carry out built-up welding reaches
Ra0.8；
Bearing bed aluminum-bronze material after processing is put into acetone soln by second step, and with ultrasonic cleaning, removes table
The greasy dirt and finely ground particles in face；
Middle high tin acieral welding wire, high tin acieral welding wire in placement is made in middle high tin acieral by third step
In acetone soln, and with ultrasonic cleaning, surface and oil contaminant and finely ground particles are removed；
Middle high tin acieral welding wire is used argon arc welding welding method heap to be soldered to copper alloy surface as antifriction and closed by the 4th step
Layer gold obtains the double-level-metal composite material applied to sliding bearing.
The measurement of intensity is combined to the present embodiment according to GB/T 1174-92 " cast bearing alloy ", obtains bearing bed
Bond strength >=90MPa of material and antifriction alloy layer material.
Embodiment 2
The present embodiment is related to a kind of double metallic composite material, as shown in Figure 1, the double metallic composite material includes bearing bed
1 and antifriction alloy layer 2 compound thereon；Double metallic composite material bearing bed 1 is made of tin bronze, the matter of tin bronze essential element
Amount percentage composition be 88.5% copper, 10.0% tin element, 1.0% P elements.Antifriction alloy layer 2 is by middle high tin aluminium
Based alloy is made, the mass percentage of middle high tin acieral essential element be 59% aluminium element, 40% tin element,
0.5% copper.
The double-level-metal composite material and preparation method thereof applied to sliding bearing of the present embodiment:
The first step prepares bearing bed aluminum-bronze material and is processed, and the surface roughness that need to carry out built-up welding reaches
Ra0.8；
Bearing bed aluminum-bronze material after processing is put into acetone soln by second step, and with ultrasonic cleaning, removes table
The greasy dirt and finely ground particles in face；
Middle high tin acieral welding wire, high tin acieral welding wire in placement is made in middle high tin acieral by third step
In acetone soln, and with ultrasonic cleaning, surface and oil contaminant and finely ground particles are removed；
Middle high tin acieral welding wire is used argon arc welding welding method heap to be soldered to copper alloy surface as antifriction and closed by the 4th step
Layer gold obtains the double-level-metal composite material applied to sliding bearing.
The measurement of intensity is combined to the present embodiment according to GB/T 1174-92 " cast bearing alloy ", obtains bearing bed
Bond strength >=85MPa of material and antifriction alloy layer material.
In conclusion the present invention relates to a kind of double-level-metal composite material and preparation method applied to sliding bearing,
Bearing bed is copper alloy, and antifriction alloy layer is middle high tin acieral, is prepared using heap welding method.With traditional mild steel
Compared with the double-level-metal composite material that babbit is combined by centrifugal casting technique, since copper alloy has compared to mild steel
There is more excellent heating conduction, middle high tin acieral has more excellent heating conduction compared to babbit, thus
Bilayer of double-level-metal composite material of the copper alloy in conjunction with middle high tin acieral compared to mild steel in conjunction with babbit
The double-level-metal composite material of metallic composite, mild steel in conjunction with copper alloy has more excellent heat-sinking capability, can be with
The heat generated in sliding bearing operational process is more quickly conducted, sliding bearing is avoided to sting with work shaft
Conjunction or locking.Middle high tin acieral has higher fatigue strength compared to babbit, and as temperature is by 0 DEG C
During being raised to 160 DEG C, babbit decrease of fatigue strength amplitude reaches 60%, and under high tin acieral fatigue strength
Range of decrease degree is within 2%.Middle high tin acieral metallographic has higher temperature tolerance compared with babbit, thus can be applied to
Higher operating temperature.It is a discovery of the invention that tin element content is more than or equal to 10% and is less than or equal to high tin aluminium base in 50%
Alloy has excellent anti-bite and embedding hiding as babbit.In addition, the preparation of double-level-metal composite material of the present invention
Method has higher bond strength compared to conventional centrifugal casting process using bead-welding technology.The present invention enables to slide
Dynamic bearing is applied under harsher operating condition.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (10)
1. a kind of double-level-metal composite material applied to sliding bearing, which is characterized in that the double-level-metal composite material packet
The antifriction alloy layer for including bearing bed and being compounded on the bearing bed；The bearing bed is copper alloy layer, the antifriction alloy layer
For middle high tin acieral layer；In middle high tin acieral the mass percentage of tin element be 10%~50%, aluminium element with
The sum of mass percentage of tin element >=90%, aluminium element and tin element are main alloy element.
2. double-level-metal composite material according to claim 1, which is characterized in that the copper alloy of the copper alloy layer includes
Brass, Allen's metal, tin bronze, aluminium bronze, silicon bronze or beryllium-bronze.
3. double-level-metal composite material according to claim 1, which is characterized in that the middle high tin acieral is polynary
Alloy.
4. double-level-metal composite material according to claim 3, which is characterized in that the middle high tin acieral also contains
One or more of copper, nickel, silicon, iron, manganese, titanium, lead, chromium, zinc, magnesium, silver, indium, lithium and rare earth element.
5. double-level-metal composite material according to claim 4, which is characterized in that the middle high tin acieral contains
One or more of copper, nickel, silicon.
6. a kind of preparation method of double-level-metal composite material according to any one of claims 1 to 5, feature exist
In described method includes following steps:
S1, prepare bearing bed copper alloy and process, keep the surface for needing to carry out built-up welding compound crown tin aluminum-based alloy material thick
Rugosity reaches Ra0.01~Ra3.2；
S2, middle high tin acieral welding wire is made in middle high tin acieral；
S3, need to carry out built-up welding compound crown tin acieral for what middle high tin acieral welding wire built-up welding to step S1 processed
The copper alloy surface of material is as antifriction alloy layer to get the double-level-metal composite material.
7. preparation method according to claim 6, which is characterized in that the copper alloy that it is good that step S1 further includes surface cleaning is gone
Except surface greasy dirt and finely ground particles the step of.
8. preparation method according to claim 6, which is characterized in that step S2 further includes high tin aluminium base conjunction in cleaning removal
Golden welding wire surface oil stain and finely ground particles.
9. preparation method according to claim 6, which is characterized in that in step S3, the method that the built-up welding uses is oxygen-
One of acetylene torch weldering, argon arc welding, cold metal transfer weldering.
10. sliding bearing made of a kind of double-level-metal composite material according to any one of claims 1 to 5, special
Sign is that the sliding bearing includes that radial plain bearing, thrust slide bearing and integrated radial plain bearing and thrust are sliding
The sliding bearing of dynamic bearing function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811445551.3A CN109296643B (en) | 2018-11-29 | 2018-11-29 | Double-layer metal composite material applied to sliding bearing and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811445551.3A CN109296643B (en) | 2018-11-29 | 2018-11-29 | Double-layer metal composite material applied to sliding bearing and preparation method thereof |
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| CN109296643A true CN109296643A (en) | 2019-02-01 |
| CN109296643B CN109296643B (en) | 2020-07-14 |
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| CN201811445551.3A Expired - Fee Related CN109296643B (en) | 2018-11-29 | 2018-11-29 | Double-layer metal composite material applied to sliding bearing and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112908953A (en) * | 2021-02-03 | 2021-06-04 | 百色市彩虹铝业有限公司 | 5G base station chip heat dissipation plate and manufacturing method |
| CN112943800A (en) * | 2021-04-17 | 2021-06-11 | 宋振亚 | Manufacturing method of sliding oil film bearing bush |
| CN116121602A (en) * | 2023-01-05 | 2023-05-16 | 江苏科技大学 | Aluminum-based light bimetallic material, preparation method and application thereof |
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| CN104837621A (en) * | 2012-12-13 | 2015-08-12 | 联合莫古尔威斯巴登有限公司 | Plain bearing composite material |
| CN104889690A (en) * | 2015-06-01 | 2015-09-09 | 陈鹏 | Bearing bush of internal combustion engine |
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| CN1341157A (en) * | 1999-02-25 | 2002-03-20 | 曼B与W狄赛尔公司 | Method for producing a wear-resistant surface on components consisting of steel and machine with at least one component of this type |
| CN1524136A (en) * | 2001-03-13 | 2004-08-25 | Electrolyte media for the deposition of tin alloys and methods for depositing tin alloys | |
| CN101614241A (en) * | 2008-05-27 | 2009-12-30 | 株式会社东芝 | Soft alloy layer forming apparatus and soft alloy layer forming method |
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| CN112908953A (en) * | 2021-02-03 | 2021-06-04 | 百色市彩虹铝业有限公司 | 5G base station chip heat dissipation plate and manufacturing method |
| CN112908953B (en) * | 2021-02-03 | 2022-11-01 | 百色市彩虹铝业有限公司 | 5G base station chip heat dissipation plate and manufacturing method |
| CN112943800A (en) * | 2021-04-17 | 2021-06-11 | 宋振亚 | Manufacturing method of sliding oil film bearing bush |
| CN116121602A (en) * | 2023-01-05 | 2023-05-16 | 江苏科技大学 | Aluminum-based light bimetallic material, preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109296643B (en) | 2020-07-14 |
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