CN110015898A - A kind of graphite sealing material and preparation method thereof - Google Patents
A kind of graphite sealing material and preparation method thereof Download PDFInfo
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- CN110015898A CN110015898A CN201810020010.XA CN201810020010A CN110015898A CN 110015898 A CN110015898 A CN 110015898A CN 201810020010 A CN201810020010 A CN 201810020010A CN 110015898 A CN110015898 A CN 110015898A
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- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
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Abstract
The invention discloses a kind of graphite sealing materials and preparation method thereof.The graphite sealing material includes: 50~80 parts of graphite, 10~30 parts of binder, 5~15 parts of silica, 1~5 part of boron oxide, 1~5 part of aluminum oxide and 0.3~15 part of feldspar composition according to mass fraction.The porosity of graphite sealing material is effectively reduced by the way that potassium feldspar, albite and wollastonite is added in graphite sealing material of the invention；By the way that silica and aluminum oxide is added, the mechanical strength and its wear-resisting property of graphite sealing material are improved, product homogeneity is good, 1.70~1.90g/cm of bulk density3, 40~60MPa of flexural strength, apparent porosity be lower than 5%, be suitable for mesolow, high speed machine seal.
Description
Technical field
The present invention relates to sealing material technical fields, and in particular to a kind of graphite sealing material and preparation method thereof.
Background technique
The layer structure of graphite makes it have a preferable greasy property, at the same graphite also have good chemical stability and
Certain mechanical strength, therefore it is often used as sealing material.Traditional graphite material production generally uses coke or graphite is
Aggregate, pitch or resin are binder, through kneading, milling, molding, charing or are graphitized obtained graphite substrate.Because carbonizing
Cheng Zhonghui generates a large amount of stomatas, therefore when graphite material is used as sealing material is typically necessary and carries out dipping sealing pores,
Common impregnating agent has phenolic resin, epoxy resin, copper, silver, babbit, glass etc., and resinae impregnating agent is logical in dipping
Chang Douhui generates certain environmental pollution, and metal and non-metal kind impregnating agent soak then to the more demanding of equipment in addition, using
The method of stain it is difficult to ensure that material homogeneity.
The Chinese patent literature of Publication No. CN106350006A discloses a kind of graphite sealing material and preparation method thereof,
The material quality number of the sealing material be a stage expect 4.8~6.6 parts, 0.4~2.0 part of graphous graphite powder, coal tar pitch 2.7~
3.2 parts, through heat mixed, roller sheet, milling, compacting, roasting, impregnate repeatedly coal tar pitch, graphitization, processing, repeatedly impregnated phenolic resin,
The graphite sealing material of processing steps such as solidify, 55~75MPa of flexural strength of material, apparent porosity < 1%, volume is close
Degree >=1.9g/cm3, have high-intensitive, corrosion-resistant, anti-oxidant, wear-resisting, self-lubricating property.It is largely used in this method
The method of dipping carries out Material reinforcement, and process is longer, higher cost.
The Chinese patent literature of Publication No. CN101050347A discloses a kind of manufacturing method of charcoal/charcoal sealant material,
Quasi- three-dimensional structure precast body is produced using needling process, precast body is placed in precompressed oriented flow gaseous phase deposition stove, using isothermal
Chemical gas-phase permeation compaction technique forms pyrolysis carbon matrix, furfural acetone resin or phenolic resin is impregnated in vacuum pressure impregnation tank,
Cured processing and charing process；Again in vacuum-pressure impregnating autoclave impregnating pitch, and the charing process in hot isostatic press；Through
High-temperature heat treatment and resin dipping sealing of hole are crossed, charcoal/charcoal sealant material is formed.Charcoal/charcoal sealant material obtained has high mechanics
Performance, good leakproofness and reliability overcome brittleness, the crack sensitivity of graphite sealing material.It is used in this method
Needle pierce that quasi- three-dimensional preform is with high costs, carbon densification process needs the gaseous phase deposition stove used, the high requirements on the equipment, simultaneously
It is also required to just material be made to have sealing performance by resin dipping sealing of hole.
Summary of the invention
It is close to be to mesh of the invention to overcome the deficiencies of the prior art and provide a kind of simple process, lower-cost graphite
Closure material and preparation method thereof.
To achieve the above object, first aspect present invention provides a kind of graphite sealing material.Specifically, the graphite is close
Closure material includes: 50~80 parts of graphite, 10~30 parts of binder, 5~15 parts of silica, boron oxide 1~5 according to mass fraction
Part, 1~5 part of aluminum oxide and 0.1~15 part of feldspar composition.
Preferably, the graphite sealing material according to mass fraction include: 60~70 parts of graphite, 15~25 parts of binder,
8~12 parts of silica, 2~4 parts of boron oxide, 2~4 parts of aluminum oxide and 1~10 part of feldspar composition.
Preferably, the graphite sealing material includes: 65 parts of graphite, 20 parts of binder, silica according to mass fraction
10 parts, 3 parts of boron oxide, 3 parts of aluminum oxide and 6 parts of feldspar composition.
Preferably, the graphite is the mixture of natural graphite, artificial graphite or natural graphite and artificial graphite, average grain
Diameter is 5~20 μm；The binder is coal tar pitch or phenolic resin；The feldspar composition is potassium feldspar, albite or silicon
One of lime stone is a variety of.
Preferably, the potassium feldspar: albite: the mass parts ratio of wollastonite is 1:1:1.
Second aspect of the present invention provides a kind of preparation method of graphite sealing material.Specifically, the preparation method
The following steps are included:
(1) graphite, binder, silica, boron oxide, aluminum oxide and feldspar composition are weighed by mass parts；
(2) raw material in step (1) is subjected in kneader kneading, obtains mixture；
(3) mixture in step (2) is crushed, is milled and is sieved, obtain powder；
(4) powder in step (3) is formed, obtains molding green compact；
(5) the molding green compact in step (4) are sintered, obtain graphite sealing material.
Preferably, the kneading temperature in the step (2) is 90~250 DEG C, and the kneading time is 30~180min.
Preferably, the powder average grain diameter in the step (3) is 20~50 μm.
Preferably, it is shaped to isostatic pressing or compression molding described in the step (4), briquetting pressure is 100~
300MPa。
Preferably, the sintering in the step (5) uses inert atmosphere as protective atmosphere, and heating rate is 0.1~5
DEG C/min, sintering temperature is 700~1200 DEG C, and soaking time is 1~6h.
The present invention has the advantage that
1, graphite sealing material of the invention can be effectively reduced graphite by the way that potassium feldspar, albite and wollastonite is added
The porosity of sealing material reduces production cost to omit the impregnation in preparation process.
2, graphite sealing material of the invention can be improved graphite grazing material by the way that silica and aluminum oxide is added
The high mechanical strength of material promotes its wear-resisting property.
3, the preparation method of graphite sealing material of the invention, simple production process, equipment investment is few, reaction condition temperature
With, production cost is low, production graphite sealing material homogeneity it is preferable, have greatly promote and apply potentiality.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
The preparation method of the graphite sealing material of the present embodiment, prepares according to the following steps:
(1) natural graphite, the 20 parts of phenolic resin, 8 parts of silica, 2 parts of oxygen that 65 parts of average grain diameters are 12.5 μm are weighed
Change boron, 3 parts of aluminum oxides, 1 part of potassium feldspar and 1 part of wollastonite；
(2) raw material in step (1) is subjected to kneading in kneader, kneading temperature is 170 DEG C, and the kneading time is
105min obtains mixture；
(3) mixture in step (2) is crushed, is milled and is sieved, obtain the powder that average grain diameter is 35 μm；
(4) powder in step (3) is formed, isostatic pressing, briquetting pressure 200Mpa, obtains molding green compact；
(5) the molding green compact in step (4) are sintered in a nitrogen atmosphere, heating rate is 3 DEG C/min, sintering temperature
Degree is 950 DEG C, and soaking time 3.5h obtains graphite sealing material.
Result of implementation: the bulk density of graphite sealing material is 1.82g/cm3, flexural strength 48MPa, apparent porosity
1.53%.
Embodiment 2
The preparation method of the graphite sealing material of the present embodiment, prepares according to the following steps:
(1) artificial graphite, 25 parts of phenolic resin, 12 parts of silica, 3 parts of oxidations that 60 parts of average grain diameters are 8 μm are weighed
Boron, 2 parts of aluminum oxides, 0.1 part of potassium feldspar, 0.1 part of albite and 2 parts of wollastonites；
(2) raw material in step (1) being subjected to kneading in kneader, kneading temperature is 90 DEG C, and the kneading time is 100min,
Obtain mixture；
(3) mixture in step (2) is crushed, is milled and is sieved, obtain the powder that average grain diameter is 25 μm；
(4) powder in step (3) is formed, compression molding, briquetting pressure 100Mpa, obtains molding green compact；
(5) the molding green compact in step (4) are sintered under an argon atmosphere, heating rate is 0.1 DEG C/min, sintering
Temperature is 800 DEG C, and soaking time 2h obtains graphite sealing material.
Result of implementation: the bulk density of graphite sealing material is 1.75g/cm3, flexural strength 55MPa, apparent porosity
3.26%.
Embodiment 3
The preparation method of the graphite sealing material of the present embodiment, prepares according to the following steps:
(1) weigh 50 parts of average grain diameters be 15 μm natural graphite and artificial graphite mixture (ratio 1:1), 30 parts
Coal tar pitch, 5 parts of silica, 5 parts of boron oxides, 1 part of aluminum oxide, 2 parts of potassium feldspars, 2 parts of albites and 3 parts of wollastonites；
(2) raw material in step (1) being subjected to kneading in kneader, kneading temperature is 250 DEG C, and the kneading time is 30min,
Obtain mixture；
(3) mixture in step (2) is crushed, is milled and is sieved, obtain the powder that average grain diameter is 45 μm；
(4) powder in step (3) is formed, isostatic pressing, briquetting pressure 250Mpa, obtains molding green compact；
(5) the molding green compact in step (4) are sintered in a nitrogen atmosphere, heating rate is 1.5 DEG C/min, sintering
Temperature is 1200 DEG C, and soaking time 1h obtains graphite sealing material.
Result of implementation: the bulk density of graphite sealing material is 1.84g/cm3, flexural strength 46MPa, apparent porosity
1.98%.
Embodiment 4
The preparation method of the graphite sealing material of the present embodiment, prepares according to the following steps:
(1) weigh 80 parts of average grain diameters be 5 μm natural graphite and artificial graphite mixture (ratio 1:1.2), 10
Part coal tar pitch, 10 parts of silica, 4 parts of boron oxides, 5 parts of aluminum oxides and 5 parts of albites；
(2) raw material in step (1) is subjected to kneading in kneader, kneading temperature is 220 DEG C, and the kneading time is
180min obtains mixture；
(3) mixture in step (2) is crushed, is milled and is sieved, obtain the powder that average grain diameter is 20 μm；
(4) powder in step (3) is formed, compression molding, briquetting pressure 260Mpa, obtains molding green compact；
(5) the molding green compact in step (4) are sintered under helium atmosphere, heating rate is 5 DEG C/min, sintering temperature
Degree is 700 DEG C, and soaking time 5h obtains graphite sealing material.
Result of implementation: the bulk density of graphite sealing material is 1.79g/cm3, flexural strength 52MPa, apparent porosity
2.46%.
Embodiment 5
The preparation method of the graphite sealing material of the present embodiment, prepares according to the following steps:
(1) natural graphite, 15 parts of phenolic resin, 15 parts of silica, 1 part of oxidation that 70 parts of average grain diameters are 20 μm are weighed
Boron, 4 parts of aluminum oxides, 5 parts of albites and 5 parts of wollastonites；
(2) raw material in step (1) being subjected to kneading in kneader, kneading temperature is 100 DEG C, and the kneading time is 50min,
Obtain mixture；
(3) mixture in step (2) is crushed, is milled and is sieved, obtain the powder that average grain diameter is 50 μm；
(4) powder in step (3) is formed, isostatic pressing, briquetting pressure 300Mpa, obtains molding green compact；
(5) the molding green compact in step (4) are sintered under helium atmosphere, heating rate is 4 DEG C/min, sintering temperature
Degree is 1100 DEG C, and soaking time 6h obtains graphite sealing material.
Result of implementation: the bulk density of graphite sealing material is 1.77g/cm3, flexural strength 58MPa, apparent porosity
4.08%.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. a kind of graphite sealing material, it is characterised in that: the graphite sealing material includes: graphite 50~80 according to mass fraction
Part, 10~30 parts of binder, 5~15 parts of silica, 1~5 part of boron oxide, 1~5 part of aluminum oxide and feldspar composition
0.1~15 part.
2. graphite sealing material according to claim 1, it is characterised in that: the graphite sealing material is according to mass fraction
It include: 60~70 parts of graphite, 15~25 parts of binder, 8~12 parts of silica, 2~4 parts of boron oxide, aluminum oxide 2~4
Part and 1~10 part of feldspar composition.
3. graphite sealing material according to claim 2, it is characterised in that: the graphite sealing material is according to mass fraction
It include: 65 parts of graphite, 20 parts of binder, 0 part of silica 1,3 parts of boron oxide, 3 parts of aluminum oxide and 6 parts of feldspar composition.
4. described in any item graphite sealing materials according to claim 1~3, it is characterised in that: the graphite be natural graphite,
The mixture of artificial graphite or natural graphite and artificial graphite, average grain diameter are 5~20 μm；The binder be coal tar pitch or
Phenolic resin；The feldspar composition is one of potassium feldspar, albite or wollastonite or a variety of.
5. graphite sealing material according to claim 4, it is characterised in that: the potassium feldspar: albite: the matter of wollastonite
Amount portion rate is 1:1:1.
6. a kind of graphite sealing material production method, it is characterised in that: the preparation method the following steps are included:
(1) graphite, binder, silica, boron oxide, aluminum oxide and feldspar composition are weighed by mass parts；
(2) raw material in step (1) is subjected in kneader kneading, obtains mixture；
(3) mixture in step (2) is crushed, is milled and is sieved, obtain powder；
(4) powder in step (3) is formed, obtains molding green compact；
(5) the molding green compact in step (4) are sintered, obtain graphite sealing material.
7. according to right want 6 described in graphite sealing material production method, it is characterised in that: the kneading temperature in the step (2)
Degree is 90~250 DEG C, and the kneading time is 30~180min.
8. graphite sealing material production method according to claim 6, it is characterised in that: the powder in the step (3)
Average grain diameter is 20~50 μm.
9. graphite sealing material production method according to claim 6, it is characterised in that: described in the step (4)
It is shaped to isostatic pressing or compression molding, briquetting pressure is 100~300MPa.
10. graphite sealing material production method according to claim 6, it is characterised in that: the sintering in the step (5)
Use inert atmosphere as protective atmosphere, heating rate is 0.1~5 DEG C/min, and sintering temperature is 700~1200 DEG C, when heat preservation
Between be 1~6h.
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| CN201810020010.XA CN110015898A (en) | 2018-01-09 | 2018-01-09 | A kind of graphite sealing material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504786A (en) * | 2022-08-29 | 2022-12-23 | 浙江工业大学 | High-strength hydrophilic porous graphite material and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20030039866A (en) * | 2001-11-16 | 2003-05-22 | 주식회사 포스코 | Carbon containing refractory for continuous casting and oxidation preventing coating material thereon |
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