CN114323917A - High-temperature furnace of mechanical property tester - Google Patents
High-temperature furnace of mechanical property tester Download PDFInfo
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- CN114323917A CN114323917A CN202111675166.XA CN202111675166A CN114323917A CN 114323917 A CN114323917 A CN 114323917A CN 202111675166 A CN202111675166 A CN 202111675166A CN 114323917 A CN114323917 A CN 114323917A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052863 mullite Inorganic materials 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 23
- 238000009413 insulation Methods 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 238000007373 indentation Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000011157 advanced composite material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses a high-temperature furnace of a mechanical property tester, which comprises a furnace body, a furnace cover, a furnace lining cover plate, a heating module, an objective table, two water inlet and outlet mechanisms and a follow-up block, wherein the furnace cover is arranged on the furnace body; the furnace lining is installed in the furnace cavity in a matching mode and is internally provided with a heating cavity, the furnace lining cover plate is connected with the heating cavity in a sealing mode, the heating cavity is heated by the heating module, the objective table is fixedly installed in the heating cavity, and the top surface of the objective table is provided with an objective groove for heating the objective table through the heating module; the furnace body is provided with a first cooling cavity positioned in the furnace wall; the furnace cover is connected on the furnace body in a covering way and is covered on the furnace lining cover plate, and a second cooling cavity is arranged in the furnace cover; this pallet sets firmly on the furnace lid and establishes by pallet top surface concave to the hole in heating chamber, and this hole aligns from top to bottom with year thing groove and passes the hole and cooperate the sample on the year thing groove with the cooperation pressure head. It has the following advantages: the follow-up block is isolated from the high-temperature furnace all the time in the experiment process, so that the normal work of other equipment and the safety of experimenters are ensured, and the temperature in the furnace chamber is kept stable.
Description
Technical Field
The invention relates to the field of high-temperature material mechanical property testers, in particular to a high-temperature furnace of a mechanical property tester.
Background
With the development of science and technology, people develop new materials based on traditional materials according to the research results of modern science and technology. The new material is divided into four categories of metal material, inorganic non-metal material, organic high molecular material and advanced composite material according to the components. The material is divided into structural material and functional material according to material property. The structural material mainly utilizes the mechanical and physical and chemical properties of the material to meet the performance requirements of high strength, high rigidity, high hardness, high temperature resistance, wear resistance, corrosion resistance, irradiation resistance and the like; the functional material mainly utilizes the electric, magnetic, acoustic, photo-thermal and other effects of the material to realize certain functions. In recent years, new materials are developed endlessly, the research on the material performance of the new materials is not separated, particularly, the mechanical performance test of the materials is an essential step before the industrial application of the new materials, and an indentation method and a scratching method are two mainstream mechanical performance test methods of the materials.
At present, most indentors and mar appearance can only carry out the mechanical properties of material test at room temperature, lead to the limitation of understanding the mechanical properties of material, bury down hidden danger for the material is under high temperature environment work, and it is crucial to design a section can install the small-size high temperature furnace on mar appearance and indentor.
Disclosure of Invention
The invention provides a high-temperature furnace of a mechanical property tester, which overcomes the defects in the background technology.
The technical scheme adopted by the invention for solving the technical problem is as follows: the high-temperature furnace of the mechanical property tester comprises a furnace body, a furnace cover, a furnace lining cover plate, a heating module, an objective table, a first water inlet and outlet mechanism, a second water inlet and outlet mechanism and a follow-up block; the furnace body comprises a plurality of furnace walls, the furnace walls enclose a furnace chamber with an upward opening, the furnace lining is installed in the furnace chamber in a matching mode and is internally provided with a heating chamber, the furnace lining cover plate is connected with the heating chamber in a sealing mode, the heating module heats the heating chamber, the objective table is fixedly installed in the heating chamber, and the top surface of the objective table is provided with an objective groove for heating the objective table through the heating module; the furnace body is provided with a first cooling cavity positioned in the furnace wall, and the first water inlet and outlet mechanism is communicated with the first cooling cavity; the furnace cover is connected to the furnace body in a covering mode and is connected to the furnace lining cover plate in a covering mode, a second cooling cavity is formed in the furnace cover, and the second water inlet and outlet mechanism is communicated with the second cooling cavity; this pallet sets firmly on the furnace lid and establishes by pallet top surface concave to the hole in heating chamber, and this hole aligns from top to bottom with year thing groove and passes the hole and cooperate the sample on the year thing groove with the cooperation pressure head.
In one embodiment: the heating cavity is formed by concavely arranging the top surface of the furnace lining, the bottom surface of the heating cavity is concavely provided with a mounting groove, and the lower end part of the objective table is arranged in the mounting groove.
In one embodiment: the furnace wall comprises a bottom furnace wall and a side furnace wall, the first cooling cavity comprises a bottom cooling cavity positioned in the bottom furnace wall and a side cooling cavity positioned in the side furnace wall, and the bottom cooling cavity is communicated with the side cooling cavity; the first water inlet and outlet mechanism comprises a first water inlet pipe and a first water outlet pipe, and the first water inlet pipe and the first water outlet pipe are respectively communicated with the two side cooling cavities which are arranged in a facing way.
In one embodiment: the furnace cover comprises two plates which are arranged left and right, a sub-cooling cavity is arranged in each plate, a water isolation section is arranged in each sub-cooling cavity, the sub-cooling cavity is S-shaped through the water isolation section, and the second cooling cavity comprises the sub-cooling cavities of the two plates; the second water inlet and outlet mechanism comprises a second water inlet pipe, a second water outlet pipe and a communicating pipe, wherein the second water inlet pipe and the second water outlet pipe are communicated with the two cover plate cavities respectively, and the communicating pipe is communicated with the two cover plate cavities.
In one embodiment: two sides of the furnace wall at the bottom of the furnace body extend outwards to form connecting plates respectively; the furnace body is provided with external fins, a protective cover is fixedly arranged at the external fins, the heating module is provided with a heating body wiring board in a matching mode, and the heating body wiring board is located in the protective cover.
In one embodiment: the heating device also comprises a temperature sensor, and the temperature sensor extends into the heating cavity.
In one embodiment: the first water inlet and outlet mechanism and the second water inlet and outlet mechanism are communicated with the cooling water circulator.
In one embodiment: the inner wall of the furnace chamber is coated with a zirconia coating, the furnace lining cover plate and the accompanying block are all processed by polycrystalline mullite, and the objective table is processed by cubic boron nitride.
In one embodiment: a cooling fan is installed on the protective cover.
Compared with the background technology, the technical scheme has the following advantages:
when the pressure head moves in the furnace cavity, the following block is driven to move synchronously, and the heating system, the cooling system and the temperature insulation system (the furnace body, the furnace lining, the furnace cover and the furnace lining cover plate) are arranged, so that a high-temperature environment is provided for materials, the following block is always isolated from the high-temperature furnace in the experiment process through the temperature insulation and cooling effects, external parts are ensured to be at room temperature, the normal work of other equipment and the safety of experimenters are ensured, and the internal temperature of the furnace cavity is kept stable.
Drawings
The invention is further described with reference to the following figures and detailed description.
Fig. 1 is one of perspective views of a high temperature furnace according to an embodiment.
Fig. 2 is a schematic top view of a high temperature furnace according to an embodiment.
Fig. 3 is a schematic perspective sectional view of a high temperature furnace according to an embodiment.
Fig. 4 is a schematic sectional view of a furnace cover of a high temperature furnace according to an embodiment.
Fig. 5 is a second perspective view of the high-temperature furnace according to the embodiment.
Fig. 6 is a schematic perspective exploded view of a high temperature furnace according to an embodiment.
Detailed Description
Referring to fig. 1 to 6, the high temperature furnace of the mechanical property tester includes a furnace body 1, a furnace cover 2, a furnace lining 3, a furnace lining cover plate 4, a heating module 5, an object stage 6, a first water inlet and outlet mechanism, a second water inlet and outlet mechanism and a follower block 7; the furnace body 1 comprises a plurality of furnace walls, the furnace walls enclose a furnace chamber with an upward opening, the furnace lining 3 is installed in the furnace chamber in an adaptive mode, the top surface of the furnace lining is concavely provided with a heating cavity 31, a furnace lining cover plate 4 is connected with the heating cavity 31 in a sealing mode, the heating module 5 heats the heating cavity 31, the heating module 5 comprises 2U-shaped silicon-molybdenum rods, the bottom surface of the heating cavity 31 is concavely provided with an installation groove, the lower end portion of an objective table 6 is installed in the installation groove and is fixed in the furnace body through ceramic screws, so that the objective table 6 is fixedly installed in the heating cavity 31, the top surface of the objective table is provided with an objective groove for heating the objective table 6 and a sample thereon through the heating module 5, if the objective groove can be used for placing a cylindrical sample with the diameter of 13mm and the height of more than 2mm, the 2U-shaped silicon-molybdenum rods are symmetrically distributed on two sides of the objective table; the furnace body 1 is provided with a first cooling cavity 11 positioned in the furnace wall, and the first water inlet and outlet mechanism is communicated with the first cooling cavity 11 to realize water cooling; the furnace cover 2 is connected on the furnace body 1 and covered on the furnace lining cover plate 4, a second cooling cavity 21 is arranged in the furnace cover 2, and the second water inlet and outlet mechanism is communicated with the second cooling cavity 21 to realize water cooling; the follower block 7 is fixedly arranged on the furnace cover 2 and is provided with a hole which is formed by the top surface of the follower block 7 and is concave to the heating cavity 31, the hole and the object carrying groove are aligned up and down to match with a pressure head to penetrate through the hole and match with a sample on the object carrying groove to realize indentation, the follower block is driven to move synchronously when the pressure head moves in the furnace cavity, the follower block is isolated from the high-temperature furnace all the time through the heat insulation and cooling effects, and the temperature inside the furnace cavity is kept stable. In the present embodiment, the furnace body 1 is made of heat-resistant steel, the inner wall of the furnace chamber is coated with a zirconia coating, the furnace lining 3, the furnace lining cover plate 4 and the following block 7 are all made of polycrystalline mullite, and the objective table 6 is made of cubic boron nitride, so that the furnace has good heat insulation.
The furnace wall of the furnace body 1 comprises a bottom furnace wall and a side furnace wall, the first cooling cavity 11 comprises a bottom cooling cavity positioned in the bottom furnace wall and a side cooling cavity positioned in the side furnace wall, and the bottom cooling cavity is communicated with the side cooling cavity; the first water inlet and outlet mechanism comprises a first water inlet pipe 12 and a first water outlet pipe 13, and the first water inlet pipe 12 and the first water outlet pipe 13 are respectively communicated with side cooling cavities which are arranged in a two-side-to-side mode. The furnace cover 2 comprises two plates which are arranged left and right to form a split design, the plates are fixed on a furnace body through screws, and the left plate and the right plate rotate in opposite directions to realize opening or closing; a sub-cooling cavity is arranged in the plate, a water insulation section 24 is arranged in the sub-cooling cavity, the sub-cooling cavity is S-shaped through the water insulation section, and the second cooling cavity comprises the sub-cooling cavities of the two plates; the second water inlet and outlet mechanism comprises a second water inlet pipe 22, a second water outlet pipe 23 and a communicating pipe 25, the second water inlet pipe and the second water outlet pipe are respectively communicated with the two cover plate cavities, the communicating pipe is communicated with the two cover plate cavities, and the cooling effect is good.
According to the requirements: the temperature sensor 8 extends into the heating cavity 31, and the first water inlet and outlet mechanism and the second water inlet and outlet mechanism are both connected with the cooling water circulator.
The two sides of the bottom wall of the furnace body 1 extend outwards to form connecting plates 14 respectively, and the connecting plates 14 are provided with mounting holes so as to fixedly mount the furnace body 1 on an indentation instrument or a scratch instrument; this furnace body 1 has external fin, and this external fin department is equipped with two safety covers 15 admittedly, and two safety covers 15 cooperate and form the loop configuration, and this heating module 5 has set heating body wiring board 151, copper line fixed block 152, and this heating body wiring board 151 and copper line fixed block 152 are located safety cover 15, and the cable mounting is in copper line fixed block connection electric cabinet. The top and bottom of the protective cover 15 are provided with positioning holes and heat dissipation holes, the left wall and the right wall of the left protective cover and the right protective cover are respectively provided with a heat dissipation fan 16, the rear walls of the left protective cover and the right protective cover are provided with elongated slots for installing cables and related circuits, and the protective covers are made of stainless steel.
The working principle of the heating module 5 is as follows: nine heating stages can be set at most in the program of the electric control cabinet, each stage can be set with current, voltage, target temperature and heat preservation time, the electric control cabinet outputs electric energy according to the program setting, the electric energy is transmitted to the heating body through the cable, the copper wire fixing block and the heating body wiring board in sequence and is converted into heat energy to improve the temperature in the heating cavity, the temperature sensor collects temperature information in the heating cavity and feeds the temperature information back to the electric control cabinet, the electric control cabinet adjusts the electric energy output according to a built-in program to enable the temperature in the heating cavity to be stabilized at the target temperature within the heat preservation time, controllable multi-section heating from room temperature to 1400 ℃ and long-time heat preservation are realized, and the temperature error is +/-1 ℃ in temperature closed-loop control.
The volume of the high-temperature furnace of the embodiment is 246mm multiplied by 190mm multiplied by 90mm, so that the high-temperature furnace is convenient to install on a scratching instrument or an indentation instrument, a heating system realizes controllable multi-section heating from room temperature to 1400 ℃ and long-time heat preservation, and the temperature error is +/-1 ℃ in closed-loop control.
Instructions for use: step 1: taking down the following block, rotating and opening the two plates in opposite directions, taking out the furnace lining cover plate, placing a sample on the objective table, covering the furnace lining cover plate, rotating and closing the plates, and putting back the following block;
step 2: setting the current, voltage, target temperature and heat preservation time of a required heating stage in a program of an electric control cabinet, and then clicking for heating; and meanwhile, opening a cooling water circulator to cool the furnace cover and the furnace body.
And step 3: if a plurality of heating stages are set, after the temperature reaches the target temperature, the scratch tester or the indenter is operated to perform the experiment, after the experiment is completed, the heat preservation time is waited to be ended, the temperature is increased to the next target temperature, the indentation tester or the scratch tester is operated again to perform the experiment, and the like, and after all the set heating stages are completed, the program of the electric control cabinet is confirmed to stop heating.
And 4, step 4: and after the temperature of the furnace chamber is recovered to the room temperature, turning off the power supply of the cooling water circulator and turning off the power supply of the electric control cabinet.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (9)
1. Mechanical properties tester high temperature furnace, its characterized in that: the device comprises a furnace body, a furnace cover, a furnace lining cover plate, a heating module, an objective table, a first water inlet and outlet mechanism, a second water inlet and outlet mechanism and a follow-up block; the furnace body comprises a plurality of furnace walls, the furnace walls enclose a furnace chamber with an upward opening, the furnace lining is installed in the furnace chamber in a matching mode and is internally provided with a heating chamber, the furnace lining cover plate is connected with the heating chamber in a sealing mode, the heating module heats the heating chamber, the objective table is fixedly installed in the heating chamber, and the top surface of the objective table is provided with an objective groove for heating the objective table through the heating module; the furnace body is provided with a first cooling cavity positioned in the furnace wall, and the first water inlet and outlet mechanism is communicated with the first cooling cavity; the furnace cover is connected to the furnace body in a covering mode and is connected to the furnace lining cover plate in a covering mode, a second cooling cavity is formed in the furnace cover, and the second water inlet and outlet mechanism is communicated with the second cooling cavity; this pallet sets firmly on the furnace lid and establishes by pallet top surface concave to the hole in heating chamber, and this hole aligns from top to bottom with year thing groove and passes the hole and cooperate the sample on the year thing groove with the cooperation pressure head.
2. The mechanical property tester high-temperature furnace of claim 1, characterized in that: the heating cavity is formed by concavely arranging the top surface of the furnace lining, the bottom surface of the heating cavity is concavely provided with a mounting groove, and the lower end part of the objective table is arranged in the mounting groove.
3. The mechanical property tester high-temperature furnace of claim 1 or 2, characterized in that: the furnace wall comprises a bottom furnace wall and a side furnace wall, the first cooling cavity comprises a bottom cooling cavity positioned in the bottom furnace wall and a side cooling cavity positioned in the side furnace wall, and the bottom cooling cavity is communicated with the side cooling cavity; the first water inlet and outlet mechanism comprises a first water inlet pipe and a first water outlet pipe, and the first water inlet pipe and the first water outlet pipe are respectively communicated with the two side cooling cavities which are arranged in a facing way.
4. The mechanical property tester high-temperature furnace of claim 1 or 2, characterized in that: the furnace cover comprises two plates which are arranged left and right, a sub-cooling cavity is arranged in each plate, a water isolation section is arranged in each sub-cooling cavity, the sub-cooling cavity is S-shaped through the water isolation section, and the second cooling cavity comprises the sub-cooling cavities of the two plates; the second water inlet and outlet mechanism comprises a second water inlet pipe, a second water outlet pipe and a communicating pipe, wherein the second water inlet pipe and the second water outlet pipe are communicated with the two cover plate cavities respectively, and the communicating pipe is communicated with the two cover plate cavities.
5. The mechanical property tester high-temperature furnace of claim 1 or 2, characterized in that: two sides of the furnace wall at the bottom of the furnace body extend outwards to form connecting plates respectively; the furnace body is provided with external fins, a protective cover is fixedly arranged at the external fins, the heating module is provided with a heating body wiring board in a matching mode, and the heating body wiring board is located in the protective cover.
6. The mechanical property tester high-temperature furnace of claim 1 or 2, characterized in that: the heating device also comprises a temperature sensor, and the temperature sensor extends into the heating cavity.
7. The mechanical property tester high-temperature furnace of claim 1 or 2, characterized in that: the first water inlet and outlet mechanism and the second water inlet and outlet mechanism are communicated with the cooling water circulator.
8. The mechanical property tester high-temperature furnace of claim 1 or 2, characterized in that: the inner wall of the furnace chamber is coated with a zirconia coating, the furnace lining cover plate and the accompanying block are all processed by polycrystalline mullite, and the objective table is processed by cubic boron nitride.
9. The mechanical property tester high-temperature furnace of claim 5, characterized in that: a cooling fan is installed on the protective cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111675166.XA CN114323917A (en) | 2021-12-31 | 2021-12-31 | High-temperature furnace of mechanical property tester |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111675166.XA CN114323917A (en) | 2021-12-31 | 2021-12-31 | High-temperature furnace of mechanical property tester |
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| CN114323917A true CN114323917A (en) | 2022-04-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204789281U (en) * | 2015-07-29 | 2015-11-18 | 武汉钢铁(集团)公司 | Refractory material gyration slagging of retractory method resistance to slag test device |
| CN205826442U (en) * | 2016-06-28 | 2016-12-21 | 北京东方德兴科技有限公司 | High temperature Rockwell apparatus |
| US20170153171A1 (en) * | 2015-10-28 | 2017-06-01 | United States Department Of Energy | Wear Test Apparatus |
| CN108037002A (en) * | 2018-01-08 | 2018-05-15 | 中国科学院金属研究所 | A kind of material ultra-temperature mechanical performance test equipment and its high temperature furnace used |
| CN109269877A (en) * | 2018-11-02 | 2019-01-25 | 航天特种材料及工艺技术研究所 | A kind of ultra-temperature mechanical performance test high temperature furnace and its heating means |
| CN110823679A (en) * | 2019-11-30 | 2020-02-21 | 天津大学 | Follow-up high-temperature inflammable gas sealing device applied to testing machine |
-
2021
- 2021-12-31 CN CN202111675166.XA patent/CN114323917A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204789281U (en) * | 2015-07-29 | 2015-11-18 | 武汉钢铁(集团)公司 | Refractory material gyration slagging of retractory method resistance to slag test device |
| US20170153171A1 (en) * | 2015-10-28 | 2017-06-01 | United States Department Of Energy | Wear Test Apparatus |
| CN205826442U (en) * | 2016-06-28 | 2016-12-21 | 北京东方德兴科技有限公司 | High temperature Rockwell apparatus |
| CN108037002A (en) * | 2018-01-08 | 2018-05-15 | 中国科学院金属研究所 | A kind of material ultra-temperature mechanical performance test equipment and its high temperature furnace used |
| CN109269877A (en) * | 2018-11-02 | 2019-01-25 | 航天特种材料及工艺技术研究所 | A kind of ultra-temperature mechanical performance test high temperature furnace and its heating means |
| CN110823679A (en) * | 2019-11-30 | 2020-02-21 | 天津大学 | Follow-up high-temperature inflammable gas sealing device applied to testing machine |
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Application publication date: 20220412 |