CN103373851A - Manufacture method of pure-carbon sealing ring - Google Patents
Manufacture method of pure-carbon sealing ring Download PDFInfo
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- CN103373851A CN103373851A CN2013101107355A CN201310110735A CN103373851A CN 103373851 A CN103373851 A CN 103373851A CN 2013101107355 A CN2013101107355 A CN 2013101107355A CN 201310110735 A CN201310110735 A CN 201310110735A CN 103373851 A CN103373851 A CN 103373851A
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Abstract
The invention relates to a manufacture method of a pure-carbon sealing ring. The manufacture method comprises the steps of: firstly, pressing press powder into a blank material of a single pure-carbon graphite sealing ring, namely, a raw material ring according to the shape and the structure of the pure-carbon sealing ring, and then sintering according to a sintering curve, and sintering the raw material ring in a sealed carbon graphite box. According to the manufacture method, the production efficiency of the pure-carbon sealing ring is increased, the production period is shortened, and the stability of the quality of the pure-carbon sealing ring is improved.
Description
Technical field
The present invention relates to a kind of manufacture method of pure carbonaceous wear ring.
Background technology
The wear ring that Carbon graphite material is made is called again pure carbonaceous wear ring, in tightness system, as ceramic ring, carborundum ring etc.Carbide ring
To the mill material.Because it has self-lubricating, resistance to wear, high temperature resistant, enough physical strengths are arranged, the coefficient of expansion is low, the thermal conductivity high is the sealing member of car combustion engine Water Pump Circulation System the best.Traditional manufacture method is: with the fine particle powdered carbon, manufacture press-powder through operations such as batching, mixing, roll, abrasive dusts; Then on the large-tonnage mechanical press, be pressed into square billet or circle base, put into the stove high temperature sintering; Blank behind the sintering carries out a series of mechanical workouts again.Because the autologous density of press-powder powder is low; fine size (325 order); so Graphite Powder 99 belongs to the non-metallic material poor fluidity; when powder is packed in the die cavity; press-powder too gently can not look like ceramics powder; carborundum powder or metal powder equally are easy to automatically implement fill up; so die cavity inside often has hole; cause after the product compacting; in the situation with equipressure; the carbon ring that is pressed into; the centre has the partial density in space will be lower than the dress real part density of dividing, and causes the density and hardness of whole product inhomogeneous, simultaneously in manufacturing processed; to make binding agent with coal-tar pitch; coal-tar pitch need carry out a series of chemical reaction in heat treatment process, make the carbon in the coal-tar pitch convert fixed carbon to; product can produce in heat-treatment process and shrink; crooked; distortion; each dimensional change is large and be difficult to grasp, thereby causes this area to be failed as ceramic ring, the method for the single moulding of using during carborundum ring is produced.
Conventional sintering procedure: Carbon Materials is when 400 ° of C are above, meeting and airborne oxygen generation oxidizing reaction, form carbon monoxide and carbon dioxide and consume, for solving this difficult point, conventional way is to use a large amount of solid carbon material product wrappings, make the carbon generation oxidation of airborne oxygen and product outer rim, directly do not contact with product self, and then reach oxidation resistant purpose.Very easily extrusion, and the fixed carbon material became uneven of piling up around the product is even, and easily to cause product to be heated inhomogeneous, directly affects quality product.Thereby cause traditional manufacture method to have following shortcoming:
1. the production cycle is long: beginning from feeding intake to final product out approximately needs 1.5-2 months.Only the high temperature sintering operation just needs 30 days from shove charge, intensification, insulation, cool off, come out of the stove etc.
2. production efficiency is low: traditional conventional machining method is that the blank material is processed into the finished product wear ring that meets drawing requirement, and according to existing processing quota, per tour (8 hours) output is 200/unit/day.
3. the blank utilization ratio is low: blank is processed into finished product, and the blank utilization ratio is low, generally only has about 15%.
4. quality product is inhomogeneous: owing to use coal-tar pitch to make binding agent, contain a large amount of fugitive constituents, uncombined carbon in the pitch, in the process that sintering heats up, pitch is when 80 ° of C, begin to soften, volatilize, product produces the situations such as contraction, distortion, cracking under the situation of volatilization fusing deliquescing; A large-scale blank will be processed into some wear rings, because the difference of the inside and outside performance of a blank causes the quality of single ring there are differences.
5. contaminate environment is large: in the course of processing, produce a lot of car bits powdered carbon dirt, improvement powdered carbon dirt flies upward very difficult, reduces powdered carbon concentration and is difficult to up to standard.
6. manufacturing cost is high: because the production cycle is long, the mode of production falls behind, and causes cost high.
Summary of the invention
Long in order to overcome the above-mentioned production cycle, production efficiency is low, quality product is inhomogeneous, the problems such as cost of manufacture height, the present invention adopts and first press-powder is pressed into single pure carbonaceous wear ring stock is raw material ring (hereinafter referred to as the raw material ring), again the method for sintering, thereby improve the production efficiency of pure carbonaceous wear ring, shorten the production cycle, improve product stability, reduce the environmental pollution in the production process.
Technical solution of the present invention is:
A kind of manufacture method of pure carbonaceous wear ring may further comprise the steps:
A. carbon graphite powder and other auxiliary materials are processed as press-powder in proportion;
B. according to shape and the structure of pure carbonaceous wear ring, it is the raw material rings that press-powder is pressed into pure carbonaceous graphite annulus stock;
C. the raw material ring is carried out sintering;
The manufacture method of above-mentioned a kind of pure carbonaceous wear ring describedly is pressed into the raw material ring with press-powder and may further comprise the steps:
A. according to product drawing, press the compression ratio 3:1 of press-powder compacting front and back, corresponding mould is also made in design;
B. press-powder is injected in the mold cavity, and with the press-powder compacting of injecting, makes to reach in the press-powder between the interior press-powder of mold cavity and the mold cavity wall not have hole, thereby make the density as pressed in the mold cavity consistent;
C. utilize press that the press-powder powder in the mold cavity is pushed up and down, make press-powder powder density after compacting reach 1.50-1.70g/cm3;
D. after forming the desired shape of product drawing, the stock that compacting is taken out in the demoulding is the raw material rings.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating, describedly the raw material ring is carried out sintering by following roasting curve the raw material ring is carried out sintering:
A. pre-heating stage: 150 minutes, temperature rose to 300 ℃ from room temperature evenly;
B. temperature rise period: 550 minutes, temperature rose to 900 ℃ from 300 ℃ evenly;
C. hot stage: sintering temperature remains on 900 ℃ to 1400 ℃, and the time is not less than 100 minutes;
D. cooling stages: 150 minutes cooling times, make the temperature in the sintering oven drop to room temperature from the sintering high temperature more than 900 ℃ evenly.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating, described hot stage is: sintering temperature remains between 900 ℃ to 1100 ℃, and the time is not less than 100 minutes.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating before sintering, is packed the raw material ring into first and is protected in the airtight carbon graphite box of container as sintering, and the raw material ring is in whole sintering process in each independent space of carbon graphite box.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating, graphite boat indoor design septated hole, a ring is put into a hole, does not mutually touch between the raw material ring.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating, the described formula rate (weight percent) that carbon graphite powder and other auxiliary materials are processed as press-powder in proportion is: pitch coke powder 5%-15%; Steady spar ink powder 10%-30%; Sweet natural gas hard (carbon) black 5%-15%; Coal-tar pitch (accounting for the dry powder ratio) 20%-40%; SULPHUR POWDER (accounting for the dry powder ratio) 20%-40%.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating, the described formula rate (weight percent) that carbon graphite powder and other auxiliary materials are processed as press-powder in proportion is: pitch coke powder 10%; Steady spar ink powder 20%; Sweet natural gas hard (carbon) black 10%; Coal-tar pitch (accounting for the dry powder ratio) 30%; SULPHUR POWDER (accounting for the dry powder ratio) 30%.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating, the nitrogen that selection ammonia decomposites in sintering oven and reducing gas hydrogen are as protection.
OnThe manufacture method of a kind of pure carbonaceous wear ring of stating, the described method that the press-powder that injects is tamped is after press-powder pushes die cavity, the reciprocal drum movement of process is with the powder compacting.
Beneficial effect: because the present invention has taked above-mentioned compression moulding, realized changing rapidly, continuously the pure carbonaceous graphite-seal ring of manufacturing, overcome the defective of conventional production methods.Concrete data are as follows:
1) significantly shorten the production cycle:
By 1.5-2 months of the past, shorten to about 14 hours
2) increased substantially production efficiency:
Be 200/unit/day by the past job rate, bring up to i.e. 10560/unit/day of 22 of per minute compactings, improved more than 50 times.
3) increased substantially the utilization ratio of material
By past blank processing and utilization rate about 15%, brought up to 100%, realized chipless working.
4) (hardness detects, and uses the sterilization hardness tester to look for N point at the working face of wear ring, looks at then whether hardness is consistent, spends then is inhomogeneous if difference in hardness surpasses 10 to have increased substantially the homogeneity of product inner quality; Parallel testing, with the thickness of the whole ring of vernier caliper measurement, difference surpasses 0.1mm and then is considered as inhomogeneous; Assemble after the whole sealing member, carry out mill, if friction has male and female face later on then is considered as inhomogeneous):
The performance ununiformity of single ring, the 20-30% by the past has been reduced to below 5%.
5) production environment is improved:
Realized the cancellation car, milled, the processing such as brill, reached chipless production, eliminated the discharging of powdered carbon dirt.
6) manufacturing cost decrease: the cost of goods manifactured that adopts the present invention to produce only has 1/2-2/3 of conventional production methods.
Two. embodiment:
Embodiment one: a kind of manufacture method of pure carbonaceous wear ring may further comprise the steps:
A. carbon graphite powder and other auxiliary materials are processed as press-powder in proportion;
B. according to shape and the structure of pure carbonaceous wear ring, it is the raw material rings that press-powder is pressed into pure carbonaceous graphite annulus stock;
C. the raw material ring is carried out sintering;
The formula rate (weight percent) of carbon graphite powder and other auxiliary materials being processed as in proportion press-powder described in the embodiment one is:
Pitch coke powder 5%-15%; Steady spar ink powder 10%-30%; Sweet natural gas hard (carbon) black 5%-15%; Coal-tar pitch (accounting for the dry powder ratio) 20%-40%; SULPHUR POWDER (accounting for the dry powder ratio) 20%-40%.
Prescription described in the embodiment one is preferably by following formulated (following prescription is optimization formula): pitch coke powder 10%; Steady spar ink powder 20%; Sweet natural gas hard (carbon) black 10%; Coal-tar pitch (accounting for the dry powder ratio) 30%; SULPHUR POWDER (accounting for the dry powder ratio) 30%.
Raw material ring that press-powder is pressed into described in the embodiment one may further comprise the steps:
A. according to product drawing, press the compression ratio 3:1 of press-powder compacting front and back, corresponding mould is also made in design;
B. press-powder is injected in the mold cavity, and with the press-powder compacting of injecting, makes to reach in the press-powder between the interior press-powder of mold cavity and the mold cavity wall not have hole, thereby make the density as pressed in the mold cavity consistent;
C. utilize press that the press-powder powder in the mold cavity is pushed up and down, make press-powder powder density after compacting reach 1.50-1.70g/cm3;
D. after forming the desired shape of product drawing, the stock that compacting is taken out in the demoulding is the raw material rings.
Described in the embodiment one be pressed into the raw material ring after, preferably pass through sorting, the Graphite Powder 99 that the raw material ring is carried separates, and waits to be sintered.
Described in the embodiment one the raw material ring is carried out sintering, by following roasting curve the raw material ring is carried out sintering and will obtain better sintering effect:
A. pre-heating stage: 150 minutes, temperature rose to 300 ℃ from room temperature evenly;
B. temperature rise period: 550 minutes, temperature rose to 900 ℃ from 300 ℃ evenly;
C. hot stage: sintering temperature remains on 900 ℃ to 1400 ℃, and the time is not less than 100 minutes;
D. cooling stages: 150 minutes cooling times, make the temperature in the sintering oven drop to room temperature from the sintering high temperature more than 900 ℃ evenly.
Through experiment, the hot stage in above-mentioned roasting curve, preferred sintering temperature remains on 900 ℃ to 1100 ℃, and the time is more to be conducive to improve yield rate, save energy in 100 minutes.
Before sintering, first single raw material ring is packed into and protect in the airtight carbon graphite box of container as sintering, each raw material ring is in respectively in whole sintering process in the carbon graphite box space, with each only pure carbonaceous wear ring do not separate mutually extruding, adhesion, guarantee that raw material ring heating temperature is even on the one hand, shrink freely, do not ftracture not flexural deformation after the pitch charing; On the other hand, when pouring in down a chimney into body of heater such as oxygen, at first with the carbon graphite box generation oxidizing reaction of splendid attire raw material ring, and then stop raw material ring or pure carbonaceous wear ring generation oxidizing reaction in oxygen and the carbon graphite box.
After the carbon graphite box of the pure carbonaceous wear ring of splendid attire enters burner hearth, successively pass through preheating, heat up, then high temperature and cooling come out of the stove.Be down to room temperature through cooling temperature when coming out of the stove, do not need any protective gloves, can bring out finished product.
In this sintering oven, can not use traditional solid carbon material to carry out oxygen barrier protection, and select ammonia to decomposite inert nitrogen and reducing gas hydrogen as protection.Nitrogen belongs to rare gas element, do not react with oxygen, and hydrogen in air flammable range (20 ℃, 101.325kPa): 4.0～74.5%, LFL lower flammable limit in air (101.325kPa): 570 ℃.The ventage that ammonia decomposes is in the high-temperature zone, more than 800 °, the hydrogen that therefore passes in body of heater with airborne oxygen reaction because advancing the carbon graphite tape to enter, stop airborne oxygen and carbonic acid gas with the raw material environment-development that is sintered and give birth to and react.The water vapour that produces is discharged body of heater from the burner hearth top.
Above-described embodiment is described as follows with the press-powder concrete technical qualification that to be pressed into pure carbonaceous graphite annulus stock be the used Special purpose pressing machine of raw material ring:
1) has: the auto-programming of feeding, eject, releasing;
2) tons gross of press: 10-100 ton: the minimum press of all wanting 10 tons, generally select about 40 tons.If but more than 100 tons per is exactly significantly to waste resource.Any one numerical value between the desirable 10-100 ton of the tonnage of press;
3) the per minute compacting is quantity: 7-30: 7 of minimum compactings, can be according to the difference of mould, and 3 or 4 die cavities appear in a mould, can suppress a plurality of products out so;
4) unit pressure of product: 50-250Mpa
5) pressed density of product: 1.50-1.70g/cm3
6) design and manufacturing particular manufacturing craft.Guarantee the size of product, profile reaches the drawing requirement of finished product.
The concrete technical qualification of the described continuous fritting furnace with protective atmosphere of above-described embodiment are:
1) the body of heater total length is: 10-50 rice: the quality of the shortest 10 meters whole products of guarantee, the longer production output that increases;
2) make protective atmosphere with the ammonia decomposition;
3) total power of continuous oven is 50-300KW: select different power according to combustion flue length;
4) continuous oven has: preheating zone, heating belt, thermal zone and cooling zone;
5) maximum operation (service) temperature is 900--1700C °;
6) every 1-3 rice a point for measuring temperature is arranged, and automatically control.
The method of the described compacting of above-described embodiment is preferred: the feeding method of reciprocal roller compaction, after soon powder will push die cavity, the reciprocal drum movement of process is with the powder compacting, press upper pressure head is descended to before pressing, there is not the space in the powder in the mold cavity and between powder and die cavity wall, the density of press-powder reaches first unanimously in the whole die cavity, and then product density and hardness after the compacting reach even.
In order to prevent that product is squeezed in progradation, manufacture and design carbon graphite box (being called again graphite boat), principal feature is in the graphite when splendid attire, layering, every layer of graphite cake splendid attire space sinks, and be not blank, causes when two-layer graphite cake is stacked together up and down, the pure carbonaceous wear ring of levels separates, and does not push.The design number of plies of graphite is according to the furnace mouth size design of sintering oven, and graphite is of a size of burner hearth apart from about the burner hearth and the space of 10mm-20mm is reserved in the top, makes things convenient for the discharge of protective gas and volatilization composition.This project is according to the size of furnace mouth, and design is 6 layers of graphite cake graphite of packing into altogether.Total height according to each ring designs and produces graphite cake, the height of overall graphite cake for compacting after the height (6mm) of ring, add the thickness (5mm) of certain graphite cake bottom, and the position of wherein putting wear ring is circular hole, empty, in order to wear ring is put to graphite cake.Each graphite annulus has own single position, hole, avoids interconnecting with other graphite annuluss, causes bonding.
Above-mentioned graphite boat can also be designed to 2-3 graphite annulus, is placed in place, same from the bottom of one's heart hole.Must identical faces when putting contact (described identical faces contact refers to
Pure carbonaceous wear ringWorking face contacts with working face, and non-working surface contacts with non-working surface), be out of shape the pressure that is produced during with the minimizing sintering.With each only pure carbonaceous wear ring separate.Make left and right sides adhesion, do not push up and down.
Graphite boat indoor design septated hole, a ring is put into a hole, does not mutually touch between the raw material ring, maintains the original state in the process of sintering, thereby has solved this problem of sintering warpage.
The described press that utilizes pushes up and down the press-powder powder in the mold cavity in the above-described embodiments, make press-powder powder density after compacting reach 1.50-1.70g/cm3, density as pressed after referring to suppress is the arbitrary density between 1.50 g/cm3 and the 1.70g/cm3, all meet the requirements, the density as pressed after the compacting is not less than 1.50 g/cm3 and is not more than 1.70g/cm3 in other words.
Adopt the described optimization formula of above-described embodiment, it is 1.50 g/cm3 that the pressure that utilizes press that the press-powder in the die cavity is imposed 8MPA just can make the density of the raw material ring of compacting; Impose different pressure, along with the rising of pressure, the density of the raw material ring of compacting also raises; It is 1.60 g/cm3 that pressure that to be 1.70 g/cm3 impose 18MPA to the press-powder in the die cavity that the pressure that press-powder in the die cavity is imposed 28MPA just can make the density of the raw material ring of compacting just can make the density of the raw material ring of compacting; In actual production, according to different product molds, different press-powder prescription, adopt same the different pressure of press output to carry out pressure testing, density to pressure testing raw material ring out detects, and selection makes the density of raw material ring be in the pressure compacting raw material ring of above-mentioned scope (namely between 1.50 g/cm3 and the 1.70g/cm3).
Described product drawing refers to about the finished product behind the sintering namely in the above-described embodiments
Pure carbonaceous wear ringShape, structure, the drawing of size.
The feeding method of described reciprocal roller compaction in the above-described embodiments, the length of described cylinder should be greater than the diameter of die cavity, the number of times of reciprocating rolling is no less than twice, the reciprocating rolling number of times is more, density more consistent (through test, reciprocal three best results of roll extrusion), gained raw material ring more deflection can not occur after the compacting, density is got over homogeneous, and parallelism is high; The trim of gained wear ring is more even behind the sintering, and is easier together to the mill material-mix during to mill.
Claims (10)
1. the manufacture method of a pure carbonaceous wear ring may further comprise the steps:
A. carbon graphite powder and other auxiliary materials are processed as press-powder in proportion;
B. according to shape and the structure of pure carbonaceous wear ring, it is the raw material rings that press-powder is pressed into pure carbonaceous graphite annulus stock;
C. the raw material ring is carried out sintering.
2. the manufacture method of a kind of pure carbonaceous wear ring according to claim 1 is characterized in that: describedly press-powder is pressed into the raw material ring may further comprise the steps:
A. according to product drawing, press the compression ratio 3:1 of press-powder compacting front and back, corresponding mould is also made in design;
B. press-powder is injected in the mold cavity, and with the press-powder compacting of injecting, makes to reach in the press-powder between the interior press-powder of mold cavity and the mold cavity wall not have hole, thereby make the density as pressed in the mold cavity consistent;
C. utilize press that the press-powder powder in the mold cavity is pushed up and down, make press-powder powder density after compacting reach 1.50-1.70g/cm3;
D. after forming the desired shape of product drawing, the stock that compacting is taken out in the demoulding is the raw material rings.
3. the manufacture method of a kind of pure carbonaceous wear ring according to claim 2 is characterized in that: describedly the raw material ring is carried out sintering by following roasting curve the raw material ring is carried out sintering:
A. pre-heating stage: 150 minutes, temperature rose to 300 ℃ from room temperature evenly;
B. temperature rise period: 550 minutes, temperature rose to 900 ℃ from 300 ℃ evenly;
C. hot stage: sintering temperature remains on 900 ℃ to 1400 ℃, and the time is not less than 100 minutes;
D. cooling stages: 150 minutes cooling times, make the temperature in the sintering oven drop to room temperature from the sintering high temperature more than 900 ℃ evenly.
4. the manufacture method of a kind of pure carbonaceous wear ring according to claim 3, it is characterized in that described hot stage: sintering temperature remains between 900 ℃ to 1100 ℃, and the time is not less than 100 minutes.
5. according to claim 1; 2, the manufacture method of 3 or 4 described a kind of pure carbonaceous wear rings; it is characterized in that: before sintering, the raw material ring is packed into protect in the airtight carbon graphite box of container as sintering first, the raw material ring is in whole sintering process in each independent space of carbon graphite box.
6. the manufacture method of a kind of pure carbonaceous wear ring according to claim 5, it is characterized in that: graphite boat indoor design septated hole, a ring is put into a hole, does not mutually touch between the raw material ring.
7. the manufacture method of a kind of pure carbonaceous wear ring according to claim 6 is characterized in that: the described formula rate (weight percent) that carbon graphite powder and other auxiliary materials are processed as press-powder in proportion is: pitch coke powder 5%-15%; Steady spar ink powder 10%-30%; Sweet natural gas hard (carbon) black 5%-15%; Coal-tar pitch (accounting for the dry powder ratio) 20%-40%; SULPHUR POWDER (accounting for the dry powder ratio) 20%-40%.
8. the manufacture method of a kind of pure carbonaceous wear ring according to claim 7 is characterized in that: the described formula rate (weight percent) that carbon graphite powder and other auxiliary materials are processed as press-powder in proportion is: pitch coke powder 10%; Steady spar ink powder 20%; Sweet natural gas hard (carbon) black 10%; Coal-tar pitch (accounting for the dry powder ratio) 30%; SULPHUR POWDER (accounting for the dry powder ratio) 30%.
9. according to claim 6, the manufacture method of 7 or 8 described a kind of pure carbonaceous wear rings is characterized in that: the nitrogen that selection ammonia decomposites in sintering oven and reducing gas hydrogen are as protection.
10. the manufacture method of a kind of pure carbonaceous wear ring according to claim 9 is characterized in that: described method with the press-powder compacting of injecting is after press-powder pushes die cavity, through reciprocal drum movement with the powder compacting.
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| CN2013101107355A CN103373851A (en) | 2012-04-13 | 2013-04-01 | Manufacture method of pure-carbon sealing ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109405550A (en) * | 2018-10-19 | 2019-03-01 | 王永兰 | A kind of full-automatic push-down sintering furnace and the single molding production process of carbon graphite ring |
| CN117447204A (en) * | 2023-12-22 | 2024-01-26 | 成都中超碳素科技有限公司 | Preparation method of mechanical carbon material |
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| CN105948014B (en) * | 2016-04-27 | 2018-01-23 | 山东恒煜石墨科技有限公司 | Seal coke/sulfonated graphene carbon graphite material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| CN1229467C (en) * | 2003-08-04 | 2005-11-30 | 山东烟台石棉制品总厂 | Reinforced sealing asbestos stool plate and its making process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405550A (en) * | 2018-10-19 | 2019-03-01 | 王永兰 | A kind of full-automatic push-down sintering furnace and the single molding production process of carbon graphite ring |
| CN117447204A (en) * | 2023-12-22 | 2024-01-26 | 成都中超碳素科技有限公司 | Preparation method of mechanical carbon material |
| CN117447204B (en) * | 2023-12-22 | 2024-03-15 | 成都中超碳素科技有限公司 | Preparation method of mechanical carbon material |
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Application publication date: 20131030 |