CN111457734A - Graphite thermal shock resistance detection furnace and detection method thereof - Google Patents
Graphite thermal shock resistance detection furnace and detection method thereof Download PDFInfo
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- CN111457734A CN111457734A CN202010171860.7A CN202010171860A CN111457734A CN 111457734 A CN111457734 A CN 111457734A CN 202010171860 A CN202010171860 A CN 202010171860A CN 111457734 A CN111457734 A CN 111457734A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/02—Furnaces of a kind not covered by any preceding group specially designed for laboratory use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
- F27D2007/063—Special atmospheres, e.g. high pressure atmospheres
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/007—Cooling of charges therein
- F27D2009/0072—Cooling of charges therein the cooling medium being a gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0224—Thermal cycling
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Abstract
The invention discloses a graphite thermal shock resistance detection furnace and a detection method thereof, and solves the technical problem that the experimental result obtained by the traditional thermal shock resistance detection method is low in accuracy, comparability and reliability. The graphite tube heating device comprises a heating cavity and a cooling cavity, wherein the lower part of the heating cavity is communicated with the upper part of the cooling cavity, a graphite tube base is arranged below the heating cavity, and a sealing cover is arranged above the heating cavity; the cooling cavity is internally provided with a stepping motor, an output shaft of the stepping motor is connected with a lead screw, and the graphite tube base is connected with the lead screw through a connecting plate. The invention enables the sample to be quickly transferred to the cooling cavity for cooling after the quick heating is finished, improves the accuracy, comparability and reliability of the experiment, shortens the time for heating and cooling and improves the experiment efficiency.
Description
Technical Field
The invention relates to the field of graphite carbon, in particular to a graphite thermal shock resistance detection furnace and a detection method thereof.
Background
Thermal shock resistance refers to the ability of a material to withstand a sharp change in temperature without being damaged, and is also referred to as thermal shock or thermal stability.
Thermal shock resistance is an important property of inorganic non-metallic materials (e.g., graphite, ceramics, etc.). When a material suddenly expands (or contracts) when heated (or cooled), thermal stress is generated because deformation of parts of the material is mutually restricted. When such thermal stress exceeds the ultimate strength of the material, chipping, peeling, and breaking occur. The thermal shock resistance of a material is mainly determined by the thermal expansion coefficient, the thermal conductivity, the fracture toughness, the specific heat, the strength and the like of the material besides the influence of thermal transmission conditions, and is also related to the organization structure, the shape, the size and the like of the material. In order to prevent the material from being damaged due to sudden temperature change in use, the material is required to have good thermal shock resistance, so in the research process of the material, the thermal shock resistance is often required to be tested.
There are many ways to express and test the thermal shock resistance. Thermal shock resistance of materials is typically measured in a quench mode. The following expression and test patterns are commonly used:
1. after the material is heated to different temperatures, quenching (air cooling or water cooling) is carried out, and the maximum temperature difference of the surface of the sample, which generates cracks, is measured. This is the thermal shock resistance in terms of temperature difference.
2. After the material is heated to a preset temperature, quenching (air cooling or water cooling) is carried out, and after the specified times, the ratio of the residual bending strength of the sample to the bending strength before the normal-temperature thermal shock is finished, and the strength retention rate is measured. This is thermal shock resistance measured as strength decay.
3. After the material is heated to a preset temperature, quenching (air cooling or water cooling) is carried out, and the test is repeated until the number of times of the macrocracks generated on the material. This is the thermal shock resistance measured in number of rapid thermal cycles.
At present, equipment specially used for thermal shock resistance experiments is rare. The traditional method is as follows: the tested sample is placed in a traditional high-temperature furnace, after the sample is heated to the temperature required by the experiment, the furnace door is manually opened, the samples are taken out of the furnace cavity one by one and placed in a cooling medium container. Because the furnace door is opened, the temperature in the furnace is reduced, and the temperature of the tested sample is reduced, thereby influencing the experimental result; meanwhile, the heating speed is slow, and the time is consumed; the material taking process needs a certain time, and the sample can absorb the heat of the sample when in contact with the clamp, so that the temperature of the sample can be further reduced, and the temperature difference (high temperature-low temperature) of the experiment can be reduced; for the parallel test of a plurality of samples, the samples need to be taken out for a plurality of times, so that the temperature of the samples is different when the samples are placed into the cooling medium container, namely the actually experienced temperature difference of each sample is different; the operation speed of each experimenter is different, and the test repeatability is poor. Therefore, the accuracy, comparability and reliability of the experimental results obtained by the above traditional method are greatly reduced.
Disclosure of Invention
The invention aims to solve the technical problems that the experimental result obtained by the traditional thermal shock resistance detection method is low in accuracy, comparability and reliability, and provides a small graphite thermal shock resistance detection device and a detection method thereof, wherein the small graphite thermal shock resistance detection device is small in size, simple in structure and accurate in experimental result.
In order to solve the technical problems, the invention adopts the following technical scheme: a graphite thermal shock resistance detection furnace comprises a heating cavity and a cooling cavity, wherein the lower part of the heating cavity is communicated with the upper part of the cooling cavity, a graphite tube base is arranged below the heating cavity, and a sealing cover is arranged above the heating cavity; the cooling cavity is internally provided with a stepping motor, an output shaft of the stepping motor is connected with a lead screw, and the graphite tube base is connected with the lead screw through a connecting plate.
A guide rail is arranged in parallel with the screw rod, and the connecting plate is sleeved on the guide rail.
The graphite tube base on be equipped with the connecting rod, the outside cover of connecting rod has the graphite tube, connecting rod upper portion and sealed lid threaded connection, the lower part is connected with the graphite tube base.
The connecting rod is provided with a plurality of strip-shaped holes. When cooling, the contact area of the graphite pipe and the inert gas is increased, and the cooling speed is higher.
And a heating wire is arranged on the outer wall of the heating cavity and connected with a high-frequency heater.
And an inert gas outlet hole and an inert gas inlet hole are formed in the outer wall of the heating cavity, and the inert gas outlet hole is formed above the inert gas inlet hole. Inert gas is introduced from the lower part of the heating cavity to prevent the graphite tube from being oxidized.
And the outer wall of the cooling cavity is provided with a cooling gas outlet hole and a cooling gas inlet hole, and the cooling gas outlet hole is arranged above the cooling gas inlet hole.
A detection method of a graphite thermal shock resistance detection furnace comprises a high-temperature heating process of a graphite tube, a cooling process of the graphite tube and a material taking process of the graphite tube, wherein the high-temperature heating process of the graphite tube comprises the following steps: placing a graphite tube on a graphite tube base through a connecting rod, and fixing a sealing cover on the connecting rod; the stepping motor is started, the stepping motor drives the screw rod to rotate, the graphite tube base is driven to move downwards through the connecting plate, the upper opening of the heating cavity is blocked by the sealing plug, the lower opening of the heating cavity is sealed by the upper half part of the graphite tube base, then inert gas is filled from the inert gas inlet hole, and the high-frequency heating furnace is started to heat at the moment.
The cooling process of the graphite tube is as follows: when the temperature of the high-frequency heating furnace for heating the graphite tube reaches the set temperature, the inert gas is turned off, the high-frequency heating machine is turned off, the stepping motor is started, the stepping motor drives the screw rod to enable the graphite tube base to continuously move downwards until the sealing cover blocks the lower opening of the heating cavity, and then the cooling gas is filled from the cooling gas inlet hole to cool the graphite tube.
The material taking process of the graphite pipe is as follows: when the temperature of graphite pipe in the cooling chamber is less than the temperature of settlement, close the cooling gas, start step motor, step motor drive lead screw makes graphite pipe base rebound, gets into the heating chamber up to the upper portion of graphite pipe base, and the upper end of connecting rod exposes, then takes off sealed lid, takes out the graphite pipe, and the material process of getting finishes.
The invention avoids the problems of long heating time in the traditional laboratory, inaccurate result caused by heat loss in the graphite transferring process, personnel safety in high-temperature operation and the like, achieves the purposes of convenient operation, quick heating, quick cooling and error reduction, and ensures that the experimental result is more accurate, real and credible.
The invention enables the sample to be quickly transferred to the cooling cavity for cooling after the quick heating is finished, improves the accuracy, comparability and reliability of the experiment, shortens the time for heating and cooling and improves the experiment efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the arrangement of the heating chamber and the cooling chamber of the present invention in combination;
FIG. 3 is a schematic cross-sectional view of the heating and cooling chambers of the present invention;
FIG. 4 is a schematic view of the upper portion of the connecting rod of the present invention;
FIG. 5 is a schematic view of the structure of the graphite tube base of the present invention in cooperation with a stepper motor.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to 5, the invention comprises a heating cavity 1 and a cooling cavity 6, wherein the lower part of the heating cavity 1 is communicated with the upper part of the cooling cavity 6, a graphite tube base 10 is arranged below the heating cavity 1, and a sealing cover 8 is arranged above the heating cavity 1; the cooling cavity 6 is internally provided with a stepping motor 13, an output shaft of the stepping motor 13 is connected with a screw rod 12, and a graphite tube base 10 is connected with the screw rod 12 through a connecting plate 101.
A guide rail 11 is arranged in parallel with the screw rod 12, and a connecting plate 101 is sleeved on the guide rail. In the process that the connecting plate 101 drives the graphite tube base 10 to ascend and descend, the connecting plate 101 is guided to prevent the connecting plate 101 from deflecting.
The graphite tube base 10 is provided with a connecting rod 9, a graphite tube 14 is sleeved outside the connecting rod 9, the upper part of the connecting rod 9 is in threaded connection with the sealing cover 8, and the lower part of the connecting rod 9 is connected with the graphite tube base 10.
The connecting rod 9 is provided with a plurality of strip-shaped holes 91. When cooling, the contact area of the graphite pipe and the inert gas is increased, and the cooling speed is higher.
The heating chamber 1 is provided with a heating wire 2 on the outer wall, and the heating wire 2 is connected with a high-frequency heater 21.
The outer wall of the heating cavity 1 is provided with an inert gas outlet hole 3 and an inert gas inlet hole 4, and the inert gas outlet hole 3 is arranged above the inert gas inlet hole 4. Inert gas is introduced from the lower part of the heating cavity to prevent the graphite tube from being oxidized.
And a cooling gas outlet hole 5 and a cooling gas inlet hole 7 are arranged on the outer wall of the cooling cavity 6, and the cooling gas outlet hole 5 is arranged above the cooling gas inlet hole 7.
The heating wire 2 of the invention is surrounded around the heating cavity 1, the sealing cover 8 can be fixed on the connecting rod through screw threads, and can move up and down in the heating cavity and can be in a sealing state, the graphite tube base 10 can seal the lower hole of the heating cavity, and can slide on the guide rail 11 through 2 holes, and the other hole can move up and down by combining with the screw rod 12.
A detection method of a graphite thermal shock resistance detection furnace comprises a high-temperature heating process of a graphite tube, a cooling process of the graphite tube and a material taking process of the graphite tube, wherein the high-temperature heating process of the graphite tube comprises the following steps: placing a graphite tube on a graphite tube base 10 through a connecting rod, and fixing a sealing cover on the connecting rod; starting the stepping motor 13, driving the screw rod 1 to rotate by the stepping motor 13, driving the graphite tube base 10 to move downwards through the connecting plate 101, so that the sealing plug 8 blocks the upper opening of the heating cavity 1, sealing the lower opening of the heating cavity by the upper half part of the graphite tube base 10, then filling inert gas from the inert gas inlet hole 4, and starting the high-frequency heating furnace to heat at the moment.
The cooling process of the graphite tube is as follows: when the temperature of the high-frequency heating furnace for heating the graphite tube reaches the set temperature, the inert gas is closed, the high-frequency heating machine is closed, the stepping motor 13 is started, the stepping motor 13 drives the screw rod 12 to enable the graphite tube base to continuously move downwards until the sealing cover 8 blocks the lower opening of the heating cavity 1, and then the cooling gas is filled from the cooling gas inlet hole 7 to cool the graphite tube.
The material taking process of the graphite pipe is as follows: when the temperature of graphite pipe in the cooling chamber is less than the temperature of settlement, close cooling gas, start step motor 13, step motor 13 drive lead screw 12 makes graphite pipe base rebound, gets into heating chamber 1 up to the upper portion of graphite pipe base 10, and the upper end of connecting rod 9 exposes, then takes off sealed lid 8, takes out the graphite pipe, and the material process of getting finishes.
Claims (10)
1. A graphite thermal shock resistance detects stove which characterized in that: the graphite tube heating device comprises a heating cavity (1) and a cooling cavity (6), wherein the lower part of the heating cavity (1) is communicated with the upper part of the cooling cavity (6), a graphite tube base (10) is arranged below the heating cavity (1), and a sealing cover (8) is arranged above the heating cavity (1); the cooling cavity (6) is internally provided with a stepping motor (13), an output shaft of the stepping motor (13) is connected with a screw rod (12), and the graphite tube base (10) is connected with the screw rod (12) through a connecting plate (101).
2. The graphite thermal shock resistance detection furnace according to claim 1, characterized in that: a guide rail (11) is arranged in parallel with the screw rod (12), and the guide rail is sleeved with a connecting plate (101).
3. The graphite thermal shock resistance detection furnace according to claim 1, characterized in that: the graphite tube base (10) is provided with a connecting rod (9), a graphite tube (14) is sleeved outside the connecting rod (9), the upper part of the connecting rod (9) is in threaded connection with the sealing cover (8), and the lower part of the connecting rod is connected with the graphite tube base (10).
4. The graphite thermal shock resistance detection furnace according to claim 1, characterized in that: the connecting rod (9) is provided with a plurality of strip-shaped holes (91).
5. The graphite thermal shock resistance detection furnace according to claim 1, characterized in that: the heating device is characterized in that a heating wire (2) is arranged on the outer wall of the heating cavity (1), and the heating wire (2) is connected with a high-frequency heater (21).
6. The graphite thermal shock resistance detection furnace according to claim 1, characterized in that: the heating chamber is characterized in that an inert gas outlet hole (3) and an inert gas inlet hole (4) are formed in the outer wall of the heating chamber (1), and the inert gas outlet hole (3) is formed above the inert gas inlet hole (4).
7. The graphite thermal shock resistance detection furnace according to claim 1, characterized in that: and the outer wall of the cooling cavity (6) is provided with a cooling gas outlet hole (5) and a cooling gas inlet hole (7), and the cooling gas outlet hole (5) is arranged above the cooling gas inlet hole (7).
8. The detection method of the graphite thermal shock resistance detection furnace according to any one of claims 1 to 7, characterized by comprising the following steps: including the high temperature heating process of graphite pipe, the cooling process of graphite pipe and the material process of getting of graphite pipe, the high temperature heating process of graphite pipe is: placing a graphite tube on a graphite tube base (10) through a connecting rod, and fixing a sealing cover on the connecting rod; the method comprises the steps that a stepping motor (13) is started, the stepping motor (13) drives a screw rod (1) to rotate, a graphite tube base (10) is driven to move downwards through a connecting plate (101), so that an upper opening of a heating cavity (1) is blocked by a sealing plug (8), the upper half part of the graphite tube base (10) seals a lower opening of the heating cavity, inert gas is filled into the graphite tube base from an inert gas inlet hole (4), and the high-frequency heating furnace is started to heat at the moment.
9. The detection method of the graphite thermal shock resistance detection furnace according to claim 8, characterized by comprising the following steps: the cooling process of the graphite tube is as follows: when the temperature of the high-frequency heating furnace for heating the graphite tube reaches the set temperature, the inert gas is closed, the high-frequency heating machine is closed, the stepping motor (13) is started, the stepping motor (13) drives the screw rod (12) to enable the graphite tube base to continuously move downwards until the sealing cover (8) blocks the lower opening of the heating cavity (1), and then the cooling gas is filled from the cooling gas inlet hole (7) to cool the graphite tube.
10. The detection method of the graphite thermal shock resistance detection furnace according to claim 9, characterized by comprising the following steps: the material taking process of the graphite pipe is as follows: when the temperature of graphite pipe was less than the temperature of settlement in the cooling chamber, closed cooling gas, start step motor (13), step motor (13) drive lead screw (12) make graphite pipe base rebound, get into heating chamber (1) up to the upper portion of graphite pipe base (10), the upper end of connecting rod (9) exposes, then takes off sealed lid (8), takes out the graphite pipe, gets the material process and finishes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010171860.7A CN111457734A (en) | 2020-03-12 | 2020-03-12 | Graphite thermal shock resistance detection furnace and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010171860.7A CN111457734A (en) | 2020-03-12 | 2020-03-12 | Graphite thermal shock resistance detection furnace and detection method thereof |
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| CN111457734A true CN111457734A (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948082A (en) * | 2020-08-19 | 2020-11-17 | 西南交通大学 | Cold and hot impact test device |
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2020
- 2020-03-12 CN CN202010171860.7A patent/CN111457734A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948082A (en) * | 2020-08-19 | 2020-11-17 | 西南交通大学 | Cold and hot impact test device |
| CN111948082B (en) * | 2020-08-19 | 2022-06-17 | 西南交通大学 | Cold and hot impact test device |
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Effective date of registration: 20210804 Address after: 475000 Dong Jiao Bian Cun, Shunhe District, Kaifeng City, Henan Province Applicant after: Kaifeng Pingmei new carbon material technology Co.,Ltd. Address before: 475000 Dongjiao Xiangbian village, Shunhe District, Kaifeng City, Henan Province Applicant before: Henan Kaitan new material design and Research Institute Co.,Ltd. |
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