CN102745991B - Molded sintered graphite sealing ring and preparation method thereof - Google Patents
Molded sintered graphite sealing ring and preparation method thereof Download PDFInfo
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- CN102745991B CN102745991B CN201210210769.7A CN201210210769A CN102745991B CN 102745991 B CN102745991 B CN 102745991B CN 201210210769 A CN201210210769 A CN 201210210769A CN 102745991 B CN102745991 B CN 102745991B
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Abstract
A molded sintered graphite sealing ring comprises the following components by weight: 50%-92% of coal tar pitch, 3%-40% of graphite powder, and 1%-10% of carbon black; a preparation method of the molded sintered graphite sealing ring comprises the following steps of: 1) material preparation; 2) granulation; 3) crushing; 4) molding; 5) sintering; 6) dipping; 7) scrubbing and drying; 8) curing processing. Compared with the prior art, the invention has the following beneficial effects that: air holes in the sealing ring are filled through carbonization of the coal tar pitch during high temperature sintering and the vacuum dipping processing, and the density and the strength of the sealing ring are improved; the surface temperature of the molded sintered sealing ring is increased from the original less than 100 DEG C to 250 DEG C in actual use; the sealing surface of the molded sintered sealing ring is not easy to blister; and the sealing effect is ensured; the carbonization of the coal tar pitch during high temperature sintering improves the self lubricity of the sealing ring, also improves the hardness of the sealing ring, provides the sealing ring with good corrosion resistance and good dry friction performance; and the service life of the sealing ring is increased by above two times when compared with that in the prior art.
Description
Technical field
The present invention relates to a kind of wear ring, particularly relate to a kind of molding sintering graphite sealed ring and preparation method thereof.
Background technology
At present, the graphite-seal ring of domestic production is mainly to adopt hot pressing graphite technique, be about to powder after Graphite Powder 99 and resin prepare in the vulcanizer of 180 ℃ with suppressing and form again after the mold cured certain hour of various models.Although hot pressing graphite-seal ring can meet service requirements at normal temperatures, but in temperature, just can produce distortion or corrosion faster when using more than 80 ℃ or the in the situation that of having corrosive medium, and it is also very fast to wear and tear, thereby make hot pressing graphite-seal ring be difficult to many have under bad working environments condition use, while particularly using in auto pump and cooling pump of diesel engine, because of yielding, quick abrasion, not corrosion-resistantly easily cause and leak, thereby cause engine to damage and water pump or cooling pump cannot normal operation be occurred.Therefore there is use temperature low (generally refer to 80 ℃ following), yielding, quick abrasion, the problem that not corrosion-resistant and work-ing life is shorter in prior art graphite-seal ring.
Summary of the invention
The object of this invention is to provide a kind of high temperature resistant, the molding sintering graphite sealed ring that not yielding, wear-resistant, corrosion-resistant and work-ing life is longer.
The present invention overcomes the above problems technical scheme used: a kind of molding sintering graphite sealed ring with following component is provided, and it is comprised of the component of following weight percent: coal-tar pitch 50%～92%, Graphite Powder 99 3%～40%, carbon black 1%～10%.
As preferably, the component of described weight percent consists of: coal-tar pitch 79%～92%, Graphite Powder 99 3%～15%, carbon black 1%～8%.
Another object of the present invention is to provide a kind of manufacture method of above-mentioned molding sintering graphite sealed ring, and it comprises the following steps:
1) coal-tar pitch, Graphite Powder 99 and carbon black are weighed, stirred by the part by weight described in claim 1, described coal-tar pitch and carbon black are powder;
2) by ethanol and step 1) in to make batch mixing be to add kneader be kneaded into particulate material at 0.05～0.3: 1 by volume, kneading time is 1～5hr, mediating temperature is 120～220 ℃;
3) by step 2) in the particulate material that makes carry out coolingly, subsequently cooled particulate material is ground into powder, and powder is sieved, described sieve is 40～120 orders;
4) by step 3) in powder after sieving put into die for molding, pressure during moulding is 50～200MPa, temperature is 150～250 ℃, the dwell time is 30～300s;
5) by step 4) in blank after moulding put into vacuum sintering furnace sintering, sintering temperature is 1100～2200 ℃, soaking time is 0.2～4hr;
6) by step 5) in blank after sintering put into vacuum impregnation stove dip treating, the medium of dipping is resin, temperature during dipping is 20～140 ℃, dipping number of times is 1～4 time, each dipping time is 1～10hr;
7) by step 6) middle sawdust or other method scrub for blank having flooded, then dry or oven drying at low temperature after water flushing, described low temperature refers to temperature 50 C and following;
8) by step 7) blank of finishing dealing with is put into solidify in tank and is cured processing, and the protection of simultaneously pressurizeing, and the pressure of pressurization is 0.2～2MPa, and solidification value is 130～240 ℃, and be 10～30hr set time.
The molding sintering graphite sealed ring that adopts above-mentioned composition and manufacture method to make, compared with prior art, beneficial effect of the present invention is, carbonization and vacuum impregnation during by coal-tar pitch high temperature sintering are processed, thereby filled up the pore of wear ring, density and the intensity of wear ring have been improved, make molding sintering wear ring surface temperature in actual use be increased to 250 ℃ from 100 ℃ of original <, the trim of molding sintering wear ring not easy to foaming or distortion, guaranteed sealing effectiveness; And carbonization during coal-tar pitch high temperature sintering has improved the self lubricity of wear ring, also improved the hardness of wear ring, and made it have good erosion resistance and good metal to-metal contact performance, more than having improved twice the work-ing life of prior art wear ring simultaneously.
As preferably, described step 2) volume ratio described in is 0.08～0.2: 1, and described kneading temperature is 125～200 ℃.
As preferably, described ethanol is dehydrated alcohol.
Described step 3) sieve described in is 60～120 orders.
Pressure during moulding as preferably, described step 4) is 100～200MPa, and described temperature is 165～240 ℃, and the described dwell time is 40～280s.
As preferably, described step 5) sintering temperature described in is 1100～2000 ℃, and described soaking time is 0.5～3hr.
Temperature during dipping as preferably, described step 6) is 25～120 ℃, and described dipping number of times is 1～3 time, and described each dipping time is 2～10hr.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
Embodiment mono-
A manufacture method for molding sintering graphite sealed ring, it comprises the following steps:
1) coal-tar pitch, Graphite Powder 99 and carbon black are weighed, stirred by the part by weight that coal-tar pitch is 65%, Graphite Powder 99 is 25%, carbon black is 10%, described coal-tar pitch and carbon black are powder;
2) by ethanol and step 1) in to make batch mixing be to add kneader to be kneaded into particulate material at 0.08: 1 by volume, kneading time is 1～5hr, mediating temperature is 120 ℃, described ethanol is dehydrated alcohol;
3) by step 2) in the particulate material that makes carry out coolingly, be placed under physical environment coolingly, general cool to room temperature, is ground into powder by cooled particulate material subsequently, and powder is sieved, described sieve is 60 orders;
4) by step 3) in powder after sieving put into die for molding, pressure during moulding is 100MPa, temperature is 165 ℃, hydropress temperature is 165 ℃, the dwell time is 280s;
5) by step 4) in blank after moulding put into vacuum sintering furnace sintering, sintering temperature is 1100 ℃, soaking time is 3hr;
6) by step 5) in blank after sintering put into vacuum impregnation stove dip treating, the medium of dipping is resin, temperature during dipping is 20 ℃, dipping number of times is 3 times, each dipping time is 10hr;
7) by step 6) the middle blank sawdust having flooded, then dry after water flushing;
8) by step 7) blank of finishing dealing with is put into solidify in tank and is cured processing, and the protection of simultaneously pressurizeing, and the pressure of pressurization is 0.2MPa, and solidification value is 130 ℃, and be 30hr set time; And finally clean wear ring surface, and by check warehouse-in after ring body surface attrition process.
The technical performance index that makes wear ring is: density 1.76g/cm
3, Shore hardness HS86, folding strength 59MPa.
Embodiment bis-
A manufacture method for molding sintering graphite sealed ring, it comprises the following steps:
1) coal-tar pitch, Graphite Powder 99 and carbon black are weighed, stirred by the part by weight that coal-tar pitch is 80%, Graphite Powder 99 is 15%, carbon black is 5%, described coal-tar pitch and carbon black are powder;
2) by ethanol and step 1) in to make batch mixing be to add kneader to be kneaded into particulate material at 0.1: 1 by volume, kneading time is 1～5hr, mediating temperature is 170 ℃;
3) by step 2) in the particulate material that makes carry out coolingly, be placed under physical environment coolingly, general cool to room temperature, is ground into powder by cooled particulate material subsequently, and powder is sieved, described sieve is 90 orders;
4) by step 3) in powder after sieving put into die for molding, pressure during moulding is 150MPa, temperature is 200 ℃, the dwell time is 160s;
5) by step 4) in blank after moulding put into vacuum sintering furnace sintering, sintering temperature is 1500 ℃, soaking time is 2.5hr;
6) by step 5) in blank after sintering put into vacuum impregnation stove dip treating, the medium of dipping is resin, temperature during dipping is 75 ℃, dipping number of times is 2 times, each dipping time is 6hr;
7) by step 6) the middle blank sawdust having flooded, then dry after water flushing;
8) by step 7) blank of finishing dealing with is put into solidify in tank and is cured processing, and the protection of simultaneously pressurizeing, and the pressure of pressurization is 1MPa, and solidification value is 180 ℃, and be 20hr set time; And finally clean wear ring surface, and by check warehouse-in after ring body surface attrition process.
The technical performance index that makes wear ring is: density 1.78g/cm
3, Shore hardness HS88, folding strength 60MPa.
Embodiment tri-
A manufacture method for molding sintering graphite sealed ring, it comprises the following steps:
1) coal-tar pitch, Graphite Powder 99 and carbon black are weighed, stirred by the part by weight that coal-tar pitch is 92%, Graphite Powder 99 is 7%, carbon black is 1%, described coal-tar pitch and carbon black are powder;
2) by ethanol and step 1) in to make batch mixing be to add kneader to be kneaded into particulate material at 0.2: 1 by volume, kneading time is 1～5hr, mediating temperature is 200 ℃;
3) by step 2) in the particulate material that makes carry out coolingly, be placed under physical environment coolingly, general cool to room temperature, is ground into powder by cooled particulate material subsequently, and powder is sieved, described sieve is 120 orders;
4) by step 3) in powder after sieving put into die for molding, pressure during moulding is 200MPa, temperature is 240 ℃, the dwell time is 40s;
5) by step 4) in blank after moulding put into vacuum sintering furnace sintering, sintering temperature is 2000 ℃, soaking time is 0.5hr;
6) by step 5) in blank after sintering put into vacuum impregnation stove dip treating, the medium of dipping is resin, temperature during dipping is 120 ℃, dipping number of times is 1 time, each dipping time is 2hr;
7) by step 6) the middle blank sawdust having flooded, then dry after water flushing;
8) by step 7) blank of finishing dealing with is put into solidify in tank and is cured processing, and the protection of simultaneously pressurizeing, and the pressure of pressurization is 2MPa, and solidification value is 240 ℃, and be 10hr set time; And finally clean wear ring surface, and by check warehouse-in after ring body surface attrition process.
The technical performance index that makes wear ring is: density 1.81g/cm
3, Shore hardness HS90, folding strength 58.5MPa.
In above-described embodiment, related equipment is the commercially available conventional equipment of prior art.
Above embodiment is only preferred embodiment of the present invention, and the present invention is not limited only to the variation that above embodiment also allows other component ratio and parameter, allly in rights to independence claimed range of the present invention, changes, and all belongs to protection domain of the present invention.
Claims (9)
1. a molding sintering graphite sealed ring, is characterized in that: it is comprised of the component of following weight percent: coal-tar pitch 50%～92%, Graphite Powder 99 3%～40%, carbon black 1%～10%.
2. molding sintering graphite sealed ring according to claim 1, is characterized in that: the component of described weight percent consists of: coal-tar pitch 65%～92%, Graphite Powder 99 7%～25%, carbon black 1%～10%.
3. a preparation method for molding sintering graphite sealed ring claimed in claim 1, is characterized in that: it comprises the following steps:
1) coal-tar pitch, Graphite Powder 99 and carbon black are weighed, stirred by the part by weight described in claim 1, described coal-tar pitch and carbon black are powder;
2) by ethanol and step 1) in to make batch mixing be to add kneader be kneaded into particulate material at 0.05～0.3: 1 by volume, kneading time is 1～5hr, mediating temperature is 120～220 ℃;
3) by step 2) in the particulate material that makes carry out coolingly, subsequently cooled particulate material is ground into powder, and powder is sieved, described sieve is 40～120 orders;
4) by step 3) in powder after sieving put into die for molding, pressure during moulding is 50～200MPa, temperature is 150～250 ℃, the dwell time is 30～300s;
5) by step 4) in blank after moulding put into vacuum sintering furnace sintering, sintering temperature is 1100～2200 ℃, soaking time is 0.2～4hr;
6) by step 5) in blank after sintering put into vacuum impregnation stove dip treating, the medium of dipping is resin, temperature during dipping is 20～140 ℃, dipping number of times is 1～4 time, each dipping time is 1～10hr;
7) by step 6) middle sawdust or other method scrub for blank having flooded, then dry or oven drying at low temperature after water flushing, described low temperature refers to temperature 50 C and following;
8) by step 7) blank of finishing dealing with is put into solidify in tank and is cured processing, and the protection of simultaneously pressurizeing, and the pressure of pressurization is 0.2～2MPa, and solidification value is 130～240 ℃, and be 10～30hr set time.
4. the preparation method of molding sintering graphite sealed ring according to claim 3, is characterized in that: the volume ratio described step 2) is 0.08～0.2: 1, and described kneading temperature is 125～200 ℃.
5. the preparation method of molding sintering graphite sealed ring according to claim 3, is characterized in that: described ethanol is dehydrated alcohol.
6. the preparation method of molding sintering graphite sealed ring according to claim 3, is characterized in that: the sieve described step 3) is 60～120 orders.
7. the preparation method of molding sintering graphite sealed ring according to claim 3, is characterized in that: pressure during moulding described step 4) is 100～200MPa, and described temperature is 165～240 ℃, and the described dwell time is 40～280s.
8. the preparation method of molding sintering graphite sealed ring according to claim 3, is characterized in that: the sintering temperature described step 5) is 1100～2000 ℃, and described soaking time is 0.5～3hr.
9. the preparation method of molding sintering graphite sealed ring according to claim 3, it is characterized in that: temperature during dipping described step 6) is 25～120 ℃, described dipping number of times is 1～3 time, and described each dipping time is 2～10hr.
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| CN201210210769.7A CN102745991B (en) | 2012-06-26 | 2012-06-26 | Molded sintered graphite sealing ring and preparation method thereof |
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| CN106145948A (en) * | 2015-04-27 | 2016-11-23 | 九格能源科技（天津）有限公司 | A kind of oxidation-resistant graphite sealing ring |
| CN107473745A (en) * | 2017-07-21 | 2017-12-15 | 西安交通大学 | A kind of preparation method of water lubriucated bearing impregnated graphite materials |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558131A (en) * | 2004-01-18 | 2004-12-29 | 南通星球石墨设备有限公司 | Asphalt graphite pipeline and production method thereof |
| CN101481505A (en) * | 2009-01-13 | 2009-07-15 | 宁波东联密封件有限公司 | Molding sintering graphite sealed ring and manufacturing method thereof |
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| CN101265103A (en) * | 2008-04-15 | 2008-09-17 | 中国科学院山西煤炭化学研究所 | Method for preparing high-temperature seal carbon/pottery composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558131A (en) * | 2004-01-18 | 2004-12-29 | 南通星球石墨设备有限公司 | Asphalt graphite pipeline and production method thereof |
| CN101481505A (en) * | 2009-01-13 | 2009-07-15 | 宁波东联密封件有限公司 | Molding sintering graphite sealed ring and manufacturing method thereof |
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