CN108679228A - It is a kind of for the powder metallurgy sealing ring and preparation method of dynamic sealing and application - Google Patents
It is a kind of for the powder metallurgy sealing ring and preparation method of dynamic sealing and application Download PDFInfo
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- CN108679228A CN108679228A CN201810466670.0A CN201810466670A CN108679228A CN 108679228 A CN108679228 A CN 108679228A CN 201810466670 A CN201810466670 A CN 201810466670A CN 108679228 A CN108679228 A CN 108679228A
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- 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
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- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
A kind of powder metallurgy sealing ring and the preparation method and application thereof for dynamic sealing, the powder metallurgy sealing ring for being used for dynamic sealing are made of following raw material：Matrix phase：Copper powder, 55~80wt%；Hardening constituent：At least one of iron powder, cobalt powder, nickel powder, glass putty, 0.5~5wt%；Solid lubrication phase：10~30wt% of graphite powder；Molybdenum disulphide powder, 1~6wt%；Curing tungsten powder, 0.2~3wt%；Boron nitride powder, 0.2~2wt%；The sum of each component percentage is 100%.The invention also includes the preparation method and applications of the powder metallurgy sealing ring for dynamic sealing.Powder metallurgy sealing ring of the present invention is particularly suited for use as being impermissible for adding lubricating oil or only allows the antifriction part for adding the boundary lubrication operating condition of a small amount of lubricating oil, can improve the secondary performance of friction, realize environmental protection and energy saving；The operating temperature for dropping low friction pair, reduces the wear rate of material.
Description
Technical field
The present invention relates to a kind of powder metallurgy sealing ring, more particularly to a kind of powder metallurgy sealing ring for dynamic sealing and
Preparation method and application.
Background technology
There is the sliding friction pair of lubrication to be possible to three kinds of lubricating status occur：Boundary lubrication, hydrldynamic pressure lubrication and unlubricated friction
Wiping state.Boundary lubrication condition is between hydrldynamic pressure lubrication and dry friction（Surface of friction pair is in direct contact）Between critical shape
State, on microcosmic rough contact surface, state that part surface is in direct contact.So-called boundary lubrication refers to being deposited on frictional interface
In one layer of film different from interface property, discontinuous, certain lubricating action, referred to as boundary lubrication are played in friction process
Film.But the formation of boundary lubricant film and holding are conditional.Since the secondary operating condition of friction, lubricating status are different, oil
Film is different in the distribution of frictional interface；With the variation of oil film thickness, wear extent can also change.When rubbing surface foot
Enough smooth, lubricating oil is abundant and has certain viscosity, and contact surface speed of related movement is higher, and frictional interface can be by hydrodynamic oil
Film is completely separated；There is hydrodynamic film continuous, that thickness is larger in interface at this time, the friction coefficient of system, wear rate are very low.
If the load on friction surface increases, temperature increases, and lubricant is insufficient or viscosity reduces, and oil film thickness can also be thinned；This
When oil film between rubbing surface easily rupture, form local dry friction, system friction coefficient increases, wear phenomenon aggravation.
Here it is boundary lubrication condition, skin covering of the surface is boundary lubricant film.Some boundary films are the active groups of oiliness improver in metal surface
Physical absorption and chemisorption are generated, stronger oil film is formed；Some are that kollag is adhered to frictional interface formation one
Layer friction film, protection frictional interface are damaged less.If the load in friction pair is larger, uneven surface, surface micro-bulge peak potion
Pressure is very big, when film strength is less than the frictional force at sliding contact, will lead to the rupture of boundary film, generates metal and directly connects
It touches.
Currently used conventional antifriction material mainly has following several：
First is disperse Hard Inclusion-lead base, tin-base babbit on soft base body（Sn,78-93%;Sb,4-14%;Cu,3-8%）；
Sn, 0-20% is added based on lead in lead-base babbitt;Sb,10-18%;Babbit bearing capacity is not strong, is suitable for speed
The not high occasion of low, temperature.Lead is to environment, harmful, general few use or disabling.
Second is that soft phase-tin bronze, Allen's metal, mock silver, Al-Pb alloy are distributed on strong basis body；Tin bronze contains
Sn5-15%;Also contain Zn, Pb, Ni etc.；Allen's metal lead tolerance reaches 30-45%；Also polynary bronze, then in the base of above-mentioned material
Ni, Sn etc. are added on plinth.In copper, lead casting alloy, lead is existed with the pure lead of dispersion.Allen's metal bearing capacity is stronger, resistance to tired
Labor performance is good, and mechanical performance is influenced by temperature small；Other than leaded bronze, the compliance of other materials, embedding Tibetan property are not
Good, wearability is poor.
Palium Al60-95%, Sn5-40%.Good thermal conductivity, fatigue strength is high, and high temperature hardness is higher.
But the coefficient of thermal expansion of material is high, preset clearance is big, otherwise easily kills.
Third is polymer, and lubricious polymeric object composite material, the fiber-reinforced polymer of filler are done with kollag
Material.Its is resistant to chemical etching to surpass metal material.The unlubricated coefficient of sliding friction is low；It is easier to realize elastomeric flow when having lubrication
Body lubricates.Intensity, elasticity modulus, creep resistance, coefficient of expansion etc. are not so good as metal.Polymer absorption liquid, accessory size
Variation is big, and shape retention is not so good.
4th is inlay self-lubricating composite bearing material, is to do skeleton by metal substrate, embedded solid in the hole of ground or slot
Body lubricant, the lubricant are a kind of novel anti-extrusion kollags.In friction process, metal substrate undertakes exhausted big portion
Divide load.In friction process, the kollag in hole or slot, which is shifted or inverted to rubbing surface, to be moved, and lubrication is formed on rubbing surface
Well, the solid transfer membrane of firm attachment and uniform fold, to reduce fretting wear.With the progress of friction, embedded solid
Lubricant is constantly provided in rubbing surface, ensure that good lubrication secondary to friction when longtime running.
The general solution of mixer end face dynamic sealing is the heap soldering iron on the rubbing surface of rotary packing ring and stationary seal ring
Based wear-resistant alloy is damaged less for protection rotating ring, and the chrome content of rotating ring surface overlaying ferroalloy is closed higher than stationary ring surface overlaying iron
The chrome content of gold.By using stiff dough to the friction pair of stiff dough, to ensure the wearability and sealing reliability of rotating ring and stationary ring.For
It is cooling and lower abrasion, it needs to inject larger amount of lubricating oil toward on rubbing surface.Due to the object meeting that leaks of banburying chamber's working media
Lubricating oil is polluted, lubricating oil is disposable.The lubricating oil polluted is discharged from sealing ring guide groove, it is necessary to conscientiously collect and careful
Weight landfill disposal.This way is continued to use for many years, which is condition maintenarnce, and stationary ring is used 1 year or more and replaced again, also has
It just fails less than half a year, it has to the case where replacing.The friction pair, which is replaced, to bother, heavy workload, and the parking period is long.Sometimes rotating ring
It all damages, replaces, maintenance needs tens of hours with stationary ring, maintenance cost is high, and parking loss is very big.Large and medium-sized mixer, it is single
Consume lubricating oil platform day and reach 200L, equipment cost of business operation is high, waste oil usually need it is buried fill out, processing cost height, environmental pressure weight.
Current technical solution has following deficiency：
1）Stiff dough is to stiff dough, and friction is secondary, and there may be break-in difficulties；Two faces all poor compliances, embedding Tibetan property is poor, foreign matter or mill
Bits enter frictional interface, it is easy to cause abrasive wear；Ferrous alloy is to ferrous alloy, it is also possible to due to two rubbing contact-materials
Intersolubility is good, it is possible to adhesive wear occurs；
2）End face dynamic sealing reliability is not high, and the service life is different in size；Sealing, which is replaced, causes shutdown loss larger；
3）Fuel consumption is high, improves operation costs, is caused compared with heavy burden to environment；
4）Drag ring surface build-up welding ferrous alloy easily causes product cracking；Bead-welding technology is complicated, and drag ring preparation flow is long, at
This height；Surface alloy crackle deteriorates the performance of product.
Invention content
The technical problem to be solved by the present invention is to：It overcomes the deficiencies of the prior art and provide a kind of suitable for being impermissible for adding
Oil only allows the self-lubricating operating condition that lubricating oil is added on a small quantity；The secondary performance of friction can be improved, realizes environmental protection section
Can, the low consumed powder metallurgy sealing ring and the preparation method and application thereof for dynamic sealing drops.
The technical solution adopted by the present invention to solve the technical problems is：A kind of powder metallurgy for dynamic sealing seals
Ring is made of following raw material：
Matrix phase：Copper powder, weight percent 55~80%；
Hardening constituent：At least one of iron powder, cobalt powder, nickel powder, glass putty, hardening constituent addition are weight percentage 0.5~5%；
Solid lubrication phase：Graphite powder, weight percent 10~30%；Molybdenum disulphide powder, weight percent 1~6%；Tungsten disulfide
Powder, weight percent 0.2~3%；Boron nitride powder, weight percent 0.2~2%；The sum of described each component weight percent is
100%。
Further, the copper powder is electrolytic copper powder or copper reduction, the mesh of the granularity of the copper powder >=200；It is preferred that the copper
The granularity of powder is 200~400 mesh.
Further, the mesh of the granularity of the hardening constituent powder >=300.
Further, the graphite powder is natural graphite powder and/or manufactured particles' graphite powder.
Further, the granularity of the natural graphite powder is 30~100 mesh；The granularity of manufactured particles' graphite powder be 50~
150 mesh.
The preparation method of the powder metallurgy sealing ring for dynamic sealing of the present invention, includes the following steps；
（1）Dispensing：Each component raw material is weighed by predetermined weight per distribution ratio, it is spare；
（2）Batch mixing：By step（1）The each component raw material weighed is placed in batch mixer and mixes 2~6 hours, obtains mixture；
（3）Die mould：To step（2）Gained mixture carries out mold die mould, and the pressure of die mould is 250~700MPa, ensures briquetting
Density reach 4.3~4.7g/cm3, the green body being pressed into is fixed on pedestal；
（4）Pressure sintering：By step（3）Gained green body is placed in together with the pedestal in sintering furnace, using hydraulic device and tooling
Pressurize to green body, sintering pressure maintains 1.0~2.5MPa, when heating logical hydrogen or nitrogen protection, sintering temperature control 850
~1050 DEG C（It is preferred that 860~1020 DEG C）, keep the temperature 1.0~4.5 hours（It is preferred that 1.5~4.0 hours）；Then adding sintering furnace
Heat cover is removed, to being sintered cover spraying cooling water, cover in green body be cooled to 200 DEG C hereinafter, come out of the stove, obtain semi-finished product；
（5）Finishing：By step（4）The sintered semi-finished product of gained are machined by design drawing to get close for moving
The powder metallurgy sealing ring of envelope.
The powder metallurgy layer and the bonding of the pedestal of powder metallurgy sealing ring produced by the present invention for dynamic sealing are strong
Spend >=30 MPa.
The powder metallurgy layer surface hardness of powder metallurgy sealing ring produced by the present invention for dynamic sealing be 10~
60HBW/10/250/30。
The invention also includes the powder metallurgy sealing ring for dynamic sealing mixer end face dynamic sealing application.
A kind of mixer shaft end moving seal, the mixer shaft end moving seal contain the powder for dynamic sealing of the present invention
Metallurgical seal ring.
Mixer end face dynamic sealing rotating speed is very low, and linear velocity is usually 1m/s or so；Apply machinery pressure with spring on stationary ring
Power or hydraulic pressure, two rubbing surfaces are close to before relative motion by precompression.Its operating condition determines the friction pair
It cannot be introduced into hydrldynamic pressure lubrication state；I.e. the friction vice division chief is in boundary lubrication condition.In order to improve the reliability of friction pair,
One is to ensure that lubricant being capable of engaging friction interface；Second is that rub pair can rapid break-in, into smaller steady of wear rate
Determine working stage.The condition of hydrodynamic is formed since the friction pair lacks, lubricating oil frictional interface more difficult to get access.The profit being pumped into
Lubricating oil can not form dynamic pressure oil film and play the role of effectively lubricating.PM self-lubricating material using the present invention for sealing
Sealing ring can be advantageous.
The present invention be used for dynamic sealing powder metallurgy sealing ring, select the copper metal material smaller to steel intersolubility as
Matrix；The matrix can suitably be strengthened by the way that other metal materials are added, and have intensity and wear-resisting property concurrently；Copper and structural alloy steel
Or high ferrochrome based alloy mating material intersolubility is small, has preferable block resistance energy；Material has polyphase microstructure knot
Structure, hard matrix phase are mutually arranged in pairs or groups with soft lubrication；Friction process, which can be formed, reduces the boundary lubricant film that micro-bulge is in direct contact, this layer
Boundary film can reduce the plow resistance of abrasive grain generation, reduce friction coefficient；To reduce abrasive wear, nonmetallic phase in material
Volume content almost accounts for the half of volume, can the external abrasive grain in embedding Tibetan or hard abrasive dust；To realize self-lubricating, in material
The self-lubricating material of cloth persistently realizes self-lubricating in friction process；Material component is practically free of low melting point, has high temperature resistant
Performance；Thermal conductivity of material is good, can prevent localized hyperthermia and preventing from killing and heel and toe wear.
Compared with prior art, the invention has the advantages that：
（1）The powder metallurgy sealing ring and friction pair material of the present invention is immiscible, and the rubbing surface of rotating ring is steel or ferroalloy,
The rubbing surface of stationary ring is the heterogeneous alloy using copper as major matrix material, and also graphite is as main solid lubricant；
Both copper and iron are substantially immiscible, and storeroom not will produce adhesion substantially；Graphite and other solid lubricants, on boundary when friction
Face forms one layer of friction film, is further reduced adhesion trend；This layer of friction film also protects surface, reduces generation abrasive wear
Risk；
（2）The copper-radicle antifriction material hardness of the powder metallurgy sealing ring of the present invention is less than antithesis, and compliance is good, to the embedding Tibetan of foreign matter
Property is good, and friction pair is made to be easy to break-in；Break-in is controlled, can reduce or prevents inordinate wear in advance occur and fail in advance
Possibility.The design of the antifriction self-lubricating material, kollag are evenly distributed among the antifriction material, to make friction pair
Contact interface on have the protection of friction film always.Lubricating oil is not noted, friction film can play lubrication protection；It injects on a small quantity
Lubricating oil, antifriction, greasy property are promoted, and are conducive to the wear rate for further decreasing friction secondary operating temperature and material.
Specific implementation mode
The present invention is described in further detail with reference to embodiments.
Embodiment 1
The present embodiment is used for the powder metallurgy sealing ring of dynamic sealing, is made of following raw material：
Matrix phase：The granularity of electrolytic copper powder, electrolytic copper powder is 200 mesh, weight percent 68%；
Hardening constituent：Iron powder, the granularity of iron powder are 300 mesh, and iron powder addition is weight percentage 5%；
Solid lubrication phase：The granularity of natural graphite powder, natural graphite powder is 100 mesh, weight percent 20%；Molybdenum disulphide powder, weight
Measure percentage 4%；Curing tungsten powder, weight percent 1%；Boron nitride powder, weight percent 2%；The each component weight percent
The sum of be 100%.
The preparation method of the powder metallurgy sealing ring for dynamic sealing of the present embodiment, includes the following steps；
（1）Dispensing：Each component raw material is weighed by above-mentioned predetermined weight per distribution ratio, it is spare；
（2）Batch mixing：By step（1）The each component raw material weighed is placed in batch mixer and mixes 4 hours, obtains mixture；
（3）Die mould：To step（2）Gained mixture carries out mold die mould, and the pressure of die mould is 700MPa, ensures the density of briquetting
Reach 4.7g/cm3, the green body being pressed into is fixed on pedestal；
（4）Pressure sintering：By step（3）Gained green body is placed in together with the pedestal in sintering furnace, using hydraulic device and tooling
Pressurize to green body, sintering pressure maintains 1.5MPa, when heating logical hydrogen shield, sintering temperature controls at 920 DEG C, and heat preservation 4 is small
When；Then the heating mantles of sintering furnace are removed, to being sintered cover spraying cooling water, cover in green body be cooled to 200 DEG C hereinafter, come out of the stove,
Obtain semi-finished product；
（5）Finishing：By step（4）The sintered semi-finished product of gained are machined by design drawing to get close for moving
The powder metallurgy sealing ring of envelope.
The powder metallurgy layer surface hardness of the present embodiment product, the powder metallurgy sealing ring for dynamic sealing is 35HBW/
10/250/30；The adhesion strength of powder metallurgy layer and the pedestal is 45 MPa.
The present embodiment products application is in mixer shaft end moving seal, and compared with existing steel-steel dynamic sealing, friction coefficient is only
It is the 1/2 of steel-steel friction coefficient, leakproofness is good；Service life extends 2 times.
Embodiment 2
The present embodiment is used for the powder metallurgy sealing ring of dynamic sealing, is made of following raw material：
Matrix phase：The granularity of copper reduction, copper reduction is 400 mesh, weight percent 80%；
Hardening constituent：Cobalt powder, the granularity of cobalt powder are 400 mesh, and cobalt powder addition is weight percentage 0.5%；
Solid lubrication phase：The granularity of manufactured particles' graphite powder is 150 mesh, weight percent 17%；Molybdenum disulphide powder, weight percent
Than 1%；Curing tungsten powder, weight percent 0.2%；Boron nitride powder, weight percent 1.3%；The each component weight percent it
Be 100%.
The preparation method of the powder metallurgy sealing ring for dynamic sealing of the present embodiment, includes the following steps；
（1）Dispensing：Each component raw material is weighed by above-mentioned predetermined weight per distribution ratio, it is spare；
（2）Batch mixing：By step（1）The each component raw material weighed is placed in batch mixer and mixes 2 hours, obtains mixture；
（3）Die mould：To step（2）Gained mixture carries out mold die mould, and the pressure of die mould is 250MPa, ensures the density of briquetting
Reach 4.3g/cm3, the green body being pressed into is fixed on pedestal；
（4）Pressure sintering：By step（3）Gained green body is placed in together with the pedestal in sintering furnace, using hydraulic device and tooling
Pressurize to green body, sintering pressure maintains 2.5MPa, when heating logical nitrogen protection, sintering temperature controls at 860 DEG C, heat preservation 1.5
Hour；Then the heating mantles of sintering furnace are removed, to being sintered cover spraying cooling water, covers interior green body and be cooled to 200 DEG C hereinafter, going out
Stove obtains semi-finished product；
（5）Finishing：By step（4）The sintered semi-finished product of gained are machined by design drawing to get close for moving
The powder metallurgy sealing ring of envelope.
The powder metallurgy layer surface hardness of the present embodiment product, the powder metallurgy sealing ring for dynamic sealing is 10HBW/
10/250/30, the adhesion strength of powder metallurgy layer and the pedestal is 35 MPa.
The present embodiment products application is in mixer end face dynamic sealing, and compared with existing steel-steel dynamic sealing, friction coefficient is only
It is the 1/2 of steel-steel friction coefficient, leakproofness is good；Service life extends 2.3 times.
Embodiment 3
The present embodiment is used for the powder metallurgy sealing ring of dynamic sealing, is made of following raw material：
Matrix phase：The granularity of electrolytic copper powder, electrolytic copper powder is 500 mesh, weight percent 55%；
Hardening constituent：Iron powder, nickel powder, the glass putty of 450 mesh, iron powder addition are weight percentage 1.5%, and nickel powder addition is weight
Percentage 1.5%, glass putty addition are weight percentage 1.5%；Hardening constituent addition adds up to 4.5%；
Solid lubrication phase：The granularity of natural graphite powder and manufactured particles' graphite powder, natural graphite powder is 80 mesh, weight percent
15%, the granularity of manufactured particles' graphite powder is 100 mesh, weight percent 15%；Graphite powder addition adds up to 30%；Molybdenum disulfide
Powder, weight percent 6%；Curing tungsten powder, weight percent 3%；Boron nitride powder, weight percent 1.5%；The each component weight
It is 100% to measure the sum of percentage.
The preparation method of the powder metallurgy sealing ring for dynamic sealing of the present embodiment, includes the following steps；
（1）Dispensing：Each component raw material is weighed by above-mentioned predetermined weight per distribution ratio, it is spare；
（2）Batch mixing：By step（1）The each component raw material weighed is placed in batch mixer and mixes 3 hours, obtains mixture；
（3）Die mould：To step（2）Gained mixture carries out mold die mould, and the pressure of die mould is 600MPa, ensures the density of briquetting
Reach 4.6g/cm3, the green body being pressed into is fixed on pedestal；
（4）Pressure sintering：By step（3）Gained green body is placed in together with the pedestal in sintering furnace, using hydraulic device and tooling
Pressurize to green body, sintering pressure maintains 1.0MPa, when heating logical hydrogen shield, sintering temperature controls at 1020 DEG C, heat preservation 2.5
Hour；Then the heating mantles of sintering furnace are removed, to being sintered cover spraying cooling water, covers interior green body and be cooled to 200 DEG C hereinafter, going out
Stove obtains semi-finished product；
（5）Finishing：By step（4）The sintered semi-finished product of gained are machined by design drawing to get close for moving
The powder metallurgy sealing ring of envelope.
The powder metallurgy layer surface hardness of the present embodiment, the powder metallurgy sealing ring for dynamic sealing is 13HBW/10/
250/30, the adhesion strength of powder metallurgy layer and the pedestal is 30 MPa.
The present embodiment is applied to mixer end face dynamic sealing, and compared with existing steel-steel dynamic sealing, friction coefficient is only
The 35% of steel-steel friction coefficient, leakproofness is good；Service life extends 1.8 times.
Embodiment 4
A kind of powder metallurgy sealing ring for dynamic sealing of the present embodiment, is made of following raw material：
Matrix phase：The granularity of copper reduction, electrolytic copper powder is 300 mesh, weight percent 75.5%；
Hardening constituent：Nickel powder, the glass putty of 500 mesh, nickel powder addition are weight percentage 2%, and glass putty addition is weight percentage
2%；Hardening constituent addition adds up to 4 %；
Solid lubrication phase：The granularity of natural graphite powder and manufactured particles' graphite powder, natural graphite powder is 30 mesh, weight percent
5%, the granularity of manufactured particles' graphite powder is 50 mesh, weight percent 10%；Graphite powder addition adds up to 15%；Molybdenum disulphide powder,
Weight percent 3.5%；Curing tungsten powder, weight percent 1.8%；Boron nitride powder, weight percent 0.2%；The each component weight
It is 100% to measure the sum of percentage.
The preparation method of the powder metallurgy sealing ring for dynamic sealing of the present embodiment, includes the following steps；
（1）Dispensing：Each component raw material is weighed by above-mentioned predetermined weight per distribution ratio, it is spare；
（2）Batch mixing：By step（1）The each component raw material weighed is placed in batch mixer and mixes 6 hours, obtains mixture；
（3）Die mould：To step（2）Gained mixture carries out mold die mould, and the pressure of die mould is 500MPa, ensures the density of briquetting
Reach 4.5g/cm3, the green body being pressed into is fixed on pedestal；
（4）Pressure sintering：By step（3）Gained green body is placed in together with the pedestal in sintering furnace, using hydraulic device and tooling
Pressurize to green body, sintering pressure maintains 2.0MPa, when heating logical hydrogen shield, sintering temperature controls at 980 DEG C, and heat preservation 3 is small
When；Then the heating mantles of sintering furnace are removed, to being sintered cover spraying cooling water, cover in green body be cooled to 200 DEG C hereinafter, come out of the stove,
Obtain semi-finished product；
（5）Finishing：By step（4）The sintered semi-finished product of gained are machined by design drawing to get close for moving
The powder metallurgy sealing ring of envelope.
The powder metallurgy layer surface hardness of the present embodiment, the powder metallurgy sealing ring for dynamic sealing is 60HBW/10/
250/30, the adhesion strength of powder metallurgy layer and the pedestal is 55MPa.
The present embodiment is applied to mixer end face dynamic sealing, and compared with existing steel-steel dynamic sealing, friction coefficient is only
The 40% of steel-steel friction coefficient, leakproofness is good；Service life extends 2.2 times.
The above is only presently preferred embodiments of the present invention, is not imposed any restrictions to the present invention, every according to the present invention
Technical spirit still belongs to protection scope of the present invention to any modification, change and equivalents made by above example.
Claims (10)
1. a kind of powder metallurgy sealing ring for dynamic sealing, which is characterized in that be made of following raw material：
Matrix phase：Copper powder, weight percent 55~80%；
Hardening constituent：At least one of iron powder, cobalt powder, nickel powder, glass putty, hardening constituent addition are weight percentage 0.5~5%；
Solid lubrication phase：Graphite powder, weight percent 10~30%；Molybdenum disulphide powder, weight percent 1~6%；Tungsten disulfide
Powder, weight percent 0.2~3%；Boron nitride powder, weight percent 0.2~2%；
The sum of described each component weight percent is 100%.
2. the powder metallurgy sealing ring according to claim 1 for dynamic sealing, which is characterized in that the copper powder is electrolysis
Copper powder or copper reduction, the mesh of the granularity of the copper powder >=200.
3. the powder metallurgy sealing ring according to claim 2 for dynamic sealing, which is characterized in that the granularity of the copper powder
For 200~400 mesh.
4. the powder metallurgy sealing ring for dynamic sealing according to one of claims 1 to 3, which is characterized in that described strong
Change granularity >=300 mesh of phase powder.
5. the powder metallurgy sealing ring for dynamic sealing according to one of Claims 1 to 4, which is characterized in that the stone
Ink powder is natural graphite powder and/or manufactured particles' graphite powder.
6. the powder metallurgy sealing ring according to claim 5 for dynamic sealing, which is characterized in that the natural graphite powder
Granularity be 30~100 mesh；The granularity of manufactured particles' graphite powder is 50~150 mesh.
7. a kind of preparation method of powder metallurgy sealing ring for dynamic sealing as described in one of claim 1~6, feature
It is, includes the following steps；
（1）Dispensing：Each component raw material is weighed by predetermined weight per distribution ratio, it is spare；
（2）Batch mixing：By step（1）The each component raw material weighed is placed in batch mixer and mixes 2~6 hours, obtains mixture；
（3）Die mould：To step（2）Gained mixture carries out mold die mould, and the pressure of die mould is 250~700MPa, ensures briquetting
Density reach 4.3~4.7g/cm3, the green body being pressed into is fixed on pedestal, the green body that must be fixed on pedestal；
（4）Pressure sintering：By step（3）Gained is fixed on the green body on pedestal, is placed in sintering furnace together with pedestal, uses
Hydraulic device and tooling pressurize to green body, and sintering pressure maintains 1.0~2.5MPa, when heating logical hydrogen or nitrogen protect
Shield, sintering temperature are controlled at 850~1050 DEG C, keep the temperature 1.0~4.5 hours；Then the heating mantles of sintering furnace are removed, to sintering
Green body in cover is cooled to 200 DEG C hereinafter, come out of the stove, obtains semi-finished product by cover spraying cooling water；
（5）Finishing：By step（4）Gained green body is machined together with the pedestal by design drawing requirement, until full
Sufficient design drawing requirement,.
8. the preparation method of the powder metallurgy sealing ring according to claim 7 for dynamic sealing, which is characterized in that step
（4）In, sintering temperature is controlled at 860~1020 DEG C.
9. the preparation method of the powder metallurgy sealing ring according to claim 7 or 8 for dynamic sealing, which is characterized in that
Step（4）In, soaking time is 1.5~4.0 hours.
10. a kind of mixer shaft end moving seal, which is characterized in that the mixer shaft end moving seal contains in claim 1 to 6
The powder metallurgy sealing ring for dynamic sealing described in arbitrary claim.
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| CN110788333A (en) * | 2019-11-23 | 2020-02-14 | 无锡市金属垫片有限公司 | Production process of metal winding gasket and metal winding gasket |
| CN111575524A (en) * | 2019-02-18 | 2020-08-25 | 红心科技有限公司 | Copper-based powder metallurgy brake pad friction block and preparation method thereof |
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