CN104002460A - Graphite pipe manufacturing method for eliminating extruding internal stress and microcracks - Google Patents
Graphite pipe manufacturing method for eliminating extruding internal stress and microcracks Download PDFInfo
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- CN104002460A CN104002460A CN201410202101.7A CN201410202101A CN104002460A CN 104002460 A CN104002460 A CN 104002460A CN 201410202101 A CN201410202101 A CN 201410202101A CN 104002460 A CN104002460 A CN 104002460A
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- graphite
- internal stress
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Ceramic Products (AREA)
Abstract
The invention discloses a graphite pipe manufacturing method for eliminating extruding internal stress and microcracks, which comprises: preparing a graphite phenolic resin plaster from graphite powder, phenolic resin and a curing agent according to a ratio of 75:21.5:3 (by mass), putting the plaster in a die, performing extrusion moulding, dipping with phenolic resin, and finally performing heat treatment. When compared with the prior art, the graphite pipe manufacturing method in the invention can effectively eliminate internal stress and microcracks of extruded graphite pipes, prevent crack growth, and thus greatly improve the compressive strength of extruded graphite pipes. In addition, the impact resistance and leakage resistance of extruded graphite pipes are also improved greatly due to no microcracks; therefore, the service life of extruded graphite pipes is prolonged, and safety and environmental protection accidents caused by contamination of a circulating water system due to leakage of material which has heat exchange with the circulating water system are prevented.
Description
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Technical field
The invention belongs to material technology field, particularly a kind of manufactured by graphite pipe making method of eliminating extruding internal stress and micro-crack.
Background technology
In Chemical Manufacture, the graphite-pipe regular size that existing graphite tubular heat exchanger adopts has ￠ 50* ￠ 38*6200, ￠ 37* ￠ 25*6200, ￠ 32* ￠ 22*6200, ￠ 26* ￠ 15*6200.These graphite-pipes are pushed and are formed by hydraulic press after normally being stirred by graphite powder, phenolic resins and curing agent, then adopt outdoor stacking naturally more than 6 months, to eliminate internal stress.The shortcoming of this method has: 1, pilling up time is long, takes up room large, needs a large amount of production capitals; 2, elimination internal stress is not thorough, can produce graphite-pipe fracture when use, and the graphite tubular heat exchanger of production is short service life, causes huge parking loss and increases maintenance cost to user; 3, can not eliminate the micro-crack that graphite-pipe produces in extrusion process, in use the impact endurance test shock of liquid body medium can make micro-crack extension, thereby makes graphite-pipe seepage or fracture, can not use, and causes huge economic loss to manufacturing enterprise; 4, in graphite-pipe extruding solidification process, produce heat release venting reaction, making has small pore in graphite-pipe, in use produces micro-seepage, affects product quality and service life of equipment.Because the seepage of material can be polluted the circulation of carrying out heat exchange with it, thus the safety and environmental protection accident causing; 5, extrusion resin graphite-pipe adopts nature to stack, and intensity is not high, can only bear the pressure of 0.4 ~ 0.8Mpa, and its scope of application is restricted, and seriously restricts development and the use of China's graphite tubular heat exchanger.
Summary of the invention
the technical problem to be solved in the present invention is:
A kind of manufactured by graphite pipe making method of eliminating extruding internal stress and micro-crack defect is provided, long with the graphite-pipe production time in solution prior art, take up room large, production cost graphite tubular heat exchanger service life high and that produce is short, normal technical problems such as micro-seepage that produce in use.
the technical solution used in the present invention is:
Eliminate the manufactured by graphite pipe making method of extruding internal stress and micro-crack, by the graphite phenolic resins clay preparing in mould through extrusion modling, obtain body, body is flooded with phenolic resins, then body is heat-treated.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, described graphite phenolic resins clay is made up of graphite powder, phenolic resins and curing agent, and its preparation mass component is 1 ~ 5 part, 70 ~ 80 parts of graphite powders, 20 ~ 25 parts, phenolic resins and curing agent.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, described preparation mass component is 3 ~ 5 parts, 72 ~ 78 parts of graphite powders, 20 ~ 23 parts, phenolic resins and curing agent.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, described graphite powder granularity is 80 ~ 120 orders, described curing agent is benzene sulfonyl chloride, ethyl-sulfate or p-methyl benzene sulfonic chloride.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, carries out, in dipping process, first vacuumizing at graphite-pipe, vacuum is-0.005 ~-0.03Mpa, then puts into phenolic resins, floods graphite-pipe, then pressurization is flooded 8 ~ 24 hours under the air pressure of 0.6 ~ 1.0Mpa.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, in dipping process, first vacuumizes, vacuum is-0.01 ~-0.02Mpa, then puts into phenolic resins, floods graphite-pipe, then pressurization is flooded 10 ~ 16 hours under the air pressure of 0.7 ~ 0.9Mpa.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, in the time heat-treating, gapped between graphite-pipe.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, in the time heat-treating, air pressure is 0.6 ~ 1.0Mpa, and energising is heating slowly, below 70 ~ 90 DEG C time, intensification per hour is no more than 20 DEG C, in the time that temperature reaches 70 ~ 90 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stops heating up until temperature is raised to 170 ~ 200 DEG C, then allow it naturally be cooled to below 40 DEG C, complete heat treatment.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, in the time heat-treating, air pressure is 0.7 ~ 0.9Mpa, and energising is heating slowly, below 75 ~ 85 DEG C time, intensification per hour is no more than 16 DEG C, in the time that temperature reaches 75 ~ 85 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stops heating up until temperature is raised to 180 ~ 190 DEG C, then allow it naturally be cooled to below 40 DEG C, complete heat treatment.
The manufactured by graphite pipe making method of aforesaid elimination extruding internal stress and micro-crack, the temperature in extrusion modling process is controlled at 120 ~ 130 DEG C.
compared with prior art, tool has the following advantages in the present invention:
1, greatly improve the compression strength of extruded anisotropic graphite pipe.After tested, the extruded anisotropic graphite pipe of same size is compared with extruded anisotropic graphite pipe in the past, and tensile strength improves 2 times, and compression strength improves 3 times, and anti-radial pressure intensity improves 2.5 times.
2, internal stress and the micro-crack that can effectively eliminate extruded anisotropic graphite pipe, prevent Crack Extension.
3, due to non-microcracked, the shock resistance of extruded anisotropic graphite pipe and anti-leakage performance are also improved widely, thereby extend the service life of extruded anisotropic graphite pipe, avoided carrying out because of material leakage pollution and it the safety and environmental protection accident that the circulation of heat exchange causes.
Brief description of the drawings
Fig. 1 is process chart of the present invention.
Detailed description of the invention
embodiment 1:
1,, with graphite powder, phenolic resins and curing agent preparation graphite phenolic resins clay, its preparation mass component is 1 ~ 5 part, 70 ~ 80 parts of graphite powders, 20 ~ 25 parts, phenolic resins and curing agent.Described graphite powder granularity is 80 ~ 120 orders, and curing agent is benzene sulfonyl chloride, ethyl-sulfate or p-methyl benzene sulfonic chloride.
2, the graphite phenolic resin glue pug preparing is put into the hydraulic extrusion press that installs mould, temperature is controlled at 120 ~ 130 DEG C, starts extruder and squeezes out graphite-pipe body.
3, the graphite body of extrusion modling is cut off, every length is 6200mm.
4, the graphite-pipe cutting is positioned in horizontal dipping still, has closed horizontal dipping still end socket.Then vacuumize, vacuum is-0.005 ~-0.03Mpa, 1.5 ~ 2.5 hours time, opening phenolic resins valve puts phenolic resins and enters in horizontal dipping still and flood graphite-pipe, close resin valve, start air compressor, under the air pressure of 0.6 ~ 1.0Mpa, flood 8 ~ 24 hours.Open resin valve, the phenolic resins in dipping still is pushed back in resin storage tank and deposited.Then close resin valve, open dipping still end socket, take out graphite-pipe in the indoor placement of aeration-drying more than 5 hours.
5, the graphite-pipe having flooded is put into horizontal heat treatment still, every graphite-pipe must separate, and can not be close together.Close horizontal heat treatment still end socket, pass into 0.6 ~ 1.0Mpa air pressure, energising is heating slowly, below 70 ~ 90 DEG C time, intensification per hour is no more than 20 DEG C, in the time that temperature reaches 70 ~ 90 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stops heating up until temperature is raised to 170 ~ 200 DEG C, then allow it naturally be cooled to below 40 DEG C, the gas of draining in heat treatment still, opens heat treatment still end socket, takes out the good graphite-pipe of heat treatment.
6, above-mentioned 4,5 technique is repeated once.
7, suppress and carry out product detection by single tube air, be qualified products without leaking without fracture.
8, product being stacked to neatly stand-by or packaging dispatches from the factory.
embodiment 2:
In step 1, when preparation graphite phenolic resins clay, its preparation mass component is 3 ~ 5 parts, 72 ~ 78 parts of graphite powders, 20 ~ 23 parts, phenolic resins and curing agent.Described graphite powder granularity is 80 ~ 120 orders, and curing agent is benzene sulfonyl chloride.All the other steps are identical with embodiment 1
.
embodiment 3:
In step 1, when preparation graphite phenolic resins clay, preparation mass component is 75 parts of graphite powders, 21.5 parts, phenolic resins, 3 parts, curing agent.Described graphite powder granularity is 80 ~ 120 orders, and curing agent is ethyl-sulfate.All the other steps are identical with embodiment 1.
embodiment 4:
In step 4, the graphite-pipe cutting is positioned in horizontal dipping still, close horizontal dipping still end socket.Then vacuumize, vacuum is-0.05Mpa, 1.5 ~ 2.5 hours time, opening phenolic resins valve puts phenolic resins and enters in horizontal dipping still and flood graphite-pipe, close resin valve, start air compressor, under the air pressure of 0.6 ~ 1.0Mpa, flood 8 ~ 24 hours.Open resin valve, the phenolic resins in dipping still is pushed back in resin storage tank and deposited.Then close resin valve, open dipping still end socket, take out graphite-pipe in the indoor placement of aeration-drying more than 5 hours.All the other steps are identical with embodiment 1.
embodiment 5:
In step 4, while vacuumizing, vacuum is-0.02Mpa that all the other steps are identical with embodiment 4.
embodiment 6:
In step 4, the graphite-pipe cutting is positioned in horizontal dipping still, close horizontal dipping still end socket.Then vacuumize, vacuum is-0.005 ~-0.03Mpa, 1.5 ~ 2.5 hours time, opening phenolic resins valve puts phenolic resins and enters in horizontal dipping still and flood graphite-pipe, close resin valve, start air compressor, under the air pressure of 0.7Mpa, flood 8 ~ 24 hours.Open resin valve, the phenolic resins in dipping still is pushed back in resin storage tank and deposited.Then close resin valve, open dipping still end socket, take out graphite-pipe in the indoor placement of aeration-drying more than 5 hours.All the other steps are identical with embodiment 1.
embodiment 7:
In step 4, adopt the air pressure of 0.9Mpa to compress the phenolic resins in horizontal dipping still, all the other steps are identical with embodiment 6.
embodiment 8:
In step 4, the graphite-pipe cutting is positioned in horizontal dipping still, close horizontal dipping still end socket.Then vacuumize, vacuum is-0.005 ~-0.03Mpa, 1.5 ~ 2.5 hours time, opening phenolic resins valve puts phenolic resins and enters in horizontal dipping still and flood graphite-pipe, close resin valve, start air compressor, under the air pressure of 0.6 ~ 1.0Mpa, flood 10 hours.Open resin valve, the phenolic resins in dipping still is pushed back in resin storage tank and deposited.Then close resin valve, open dipping still end socket, take out graphite-pipe in the indoor placement of aeration-drying more than 5 hours, in step 4, the compression time of phenolic resins is 14 hours, and all the other steps are identical with embodiment 1.
embodiment 9:
In step 4, the compression time of phenolic resins is 14 hours, and all the other steps are identical with embodiment 8.
embodiment 10:
In step 4, the compression time of phenolic resins is 18 hours, and all the other steps are identical with embodiment 8.
embodiment 11:
In step 4, the compression time of phenolic resins is 22 hours, and all the other steps are identical with embodiment 8.
embodiment 12:
In step 5, the graphite-pipe having flooded is put into horizontal heat treatment still, every graphite-pipe must separate, and can not be close together.Close horizontal heat treatment still end socket, pass into 0.7Mpa air pressure, energising is heating slowly, below 70 DEG C time, intensification per hour is no more than 20 DEG C, in the time that temperature reaches 70 ~ 90 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stops heating up until temperature is raised to 170 ~ 200 DEG C, then allow it naturally be cooled to below 40 DEG C, the gas of draining in heat treatment still, opens heat treatment still end socket, takes out the good graphite-pipe of heat treatment.All the other steps are identical with embodiment 1.
embodiment 13:
In step 5, pass into the air pressure of 0.9Mpa, all the other steps are identical with embodiment 12.
embodiment 14:
In step 5, the graphite-pipe having flooded is put into horizontal heat treatment still, every graphite-pipe must separate, and can not be close together.Close horizontal heat treatment still end socket, pass into 0.7Mpa air pressure, energising is heating slowly, below 70 DEG C time, intensification per hour is no more than 16 DEG C, in the time that temperature reaches 75 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stops heating up until temperature is raised to 180 DEG C, then allow it naturally be cooled to below 40 DEG C, the gas of draining in heat treatment still, opens heat treatment still end socket, takes out the good graphite-pipe of heat treatment.All the other steps are identical with embodiment 1.
embodiment 15:
In step 5, close horizontal heat treatment still end socket, pass into 0.7Mpa air pressure, energising is heating slowly, below 90 DEG C time, intensification per hour is no more than 16 DEG C, in the time that temperature reaches 90 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stop heating up until temperature is raised to 180 DEG C, then allow it naturally be cooled to below 40 DEG C, the gas of draining in heat treatment still, open heat treatment still end socket, take out the good graphite-pipe of heat treatment.All the other steps are identical with embodiment 14.
embodiment 16:
In step 5, close horizontal heat treatment still end socket, pass into 0.7Mpa air pressure, energising is heating slowly, below 80 DEG C time, intensification per hour is no more than 16 DEG C, in the time that temperature reaches 80 ~ 90 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stop heating up until temperature is raised to 180 DEG C, then allow it naturally be cooled to below 40 DEG C, the gas of draining in heat treatment still, open heat treatment still end socket, take out the good graphite-pipe of heat treatment.All the other steps are identical with embodiment 14.
embodiment 17:
In step 5, the graphite-pipe having flooded is put into horizontal heat treatment still, every graphite-pipe must separate, and can not be close together.Close horizontal heat treatment still end socket, pass into 0.6 ~ 1.0Mpa air pressure, energising is heating slowly, below 70 ~ 90 DEG C time, intensification per hour is no more than 20 DEG C, in the time that temperature reaches 70 ~ 90 DEG C, intensification per hour controls to 5 ~ 10 DEG C, until temperature stops while being raised to 190 DEG C heating up, then allow it naturally be cooled to below 40 DEG C, the gas of draining in heat treatment still, opens heat treatment still end socket, takes out the good graphite-pipe of heat treatment.All the other steps are identical with embodiment 1.
Claims (10)
1. a manufactured by graphite pipe making method of eliminating extruding internal stress and micro-crack, is characterized in that: by the graphite phenolic resins clay preparing in mould through extrusion modling, obtain body, body is flooded with phenolic resins, then body is heat-treated.
2. the manufactured by graphite pipe making method of elimination extruding internal stress according to claim 1 and micro-crack, it is characterized in that: described graphite phenolic resins clay is made up of graphite powder, phenolic resins and curing agent, its preparation mass component is 1 ~ 5 part, 20 ~ 25 parts of 70 ~ 80 parts of graphite powders, phenolic resins and curing agent.
3. the manufactured by graphite pipe making method of elimination according to claim 2 extruding internal stress and micro-crack, is characterized in that: described preparation mass component is 3 ~ 5 parts, 72 ~ 78 parts of graphite powders, 20 ~ 23 parts, phenolic resins and curing agent.
4. the manufactured by graphite pipe making method of elimination extruding internal stress according to claim 3 and micro-crack, is characterized in that: described graphite powder granularity is 80 ~ 120 orders, and described curing agent is benzene sulfonyl chloride, ethyl-sulfate or p-methyl benzene sulfonic chloride.
5. the manufactured by graphite pipe making method of elimination extruding internal stress according to claim 1 and micro-crack, it is characterized in that: carry out in dipping process at graphite-pipe, first vacuumize, vacuum is-0.005 ~-0.03Mpa, then put into phenolic resins, flood graphite-pipe, then pressurization is flooded 8 ~ 24 hours under the air pressure of 0.6 ~ 1.0Mpa.
6. the manufactured by graphite pipe making method of elimination extruding internal stress according to claim 5 and micro-crack, it is characterized in that: in dipping process, first vacuumize, vacuum is-0.01 ~-0.02Mpa, then put into phenolic resins, flood graphite-pipe, then pressurization is flooded 10 ~ 16 hours under the air pressure of 0.7 ~ 0.9Mpa.
7. the manufactured by graphite pipe making method of elimination extruding internal stress according to claim 1 and micro-crack, is characterized in that: in the time heat-treating, gapped between graphite-pipe.
8. according to the elimination extruding internal stress described in claim 1 or 7 and the manufactured by graphite pipe making method of micro-crack, it is characterized in that: in the time heat-treating, air pressure is 0.6 ~ 1.0Mpa, and energising is heating slowly, below 70 ~ 90 DEG C time, intensification per hour is no more than 20 DEG C, in the time that temperature reaches 70 ~ 90 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stops heating up until temperature is raised to 170 ~ 200 DEG C, then allow it naturally be cooled to below 40 DEG C, complete heat treatment.
9. the manufactured by graphite pipe making method of elimination extruding internal stress according to claim 8 and micro-crack, it is characterized in that: in the time heat-treating, air pressure is 0.7 ~ 0.9Mpa, and energising is heating slowly, below 75 ~ 85 DEG C time, intensification per hour is no more than 16 DEG C, in the time that temperature reaches 75 ~ 85 DEG C, intensification per hour controls to 5 ~ 10 DEG C, stops heating up until temperature is raised to 180 ~ 190 DEG C, then allow it naturally be cooled to below 40 DEG C, complete heat treatment.
10. the manufactured by graphite pipe making method of elimination extruding internal stress according to claim 1 and micro-crack, is characterized in that: the temperature in extrusion modling process is controlled at 120 ~ 130 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202101.7A CN104002460A (en) | 2014-05-13 | 2014-05-13 | Graphite pipe manufacturing method for eliminating extruding internal stress and microcracks |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410202101.7A CN104002460A (en) | 2014-05-13 | 2014-05-13 | Graphite pipe manufacturing method for eliminating extruding internal stress and microcracks |
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| CN104002460A true CN104002460A (en) | 2014-08-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105968706A (en) * | 2016-07-11 | 2016-09-28 | 南通星球石墨设备有限公司 | Graphite pipe |
| CN109970389A (en) * | 2018-12-22 | 2019-07-05 | 中国平煤神马集团开封炭素有限公司 | A kind of preparation method of Resbon tube |
| CN115138539A (en) * | 2022-06-28 | 2022-10-04 | 贵州兰鑫石墨机电设备制造有限公司 | Glue injection repairing method and glue injection device for abnormal sound of distance tube of graphite tube heat exchanger |
| CN115138539B (en) * | 2022-06-28 | 2024-05-03 | 贵州兰鑫石墨机电设备制造有限公司 | Glue injection repairing method and glue injection device for abnormal sound of distance tube of graphite tube heat exchanger |
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