CN211668995U - Low-temperature nano indentation experimental device - Google Patents

Abstract

The utility model discloses a low-temperature nano-indentation experimental device. From bottom to top, there are a base, a worktable, a vacuum cover and a testing machine. The center of the worktable is a circular cavity that runs through, and the middle of the circular cavity A heat exchange plate is fixedly connected, and a disk-shaped sample tray is placed above the heat exchange plate; the upper surface of the sample tray is provided with a sample holding assembly and a ring-shaped rack, and a servo motor is engaged with the rack. There is an opening on the top of the vacuum cover, and the pressure rod of the testing machine is inserted through the opening; the lower part of the sample tray is provided with a catheter arranged in a disc shape, and the catheter is connected with a number of vertically upward nozzles. The tail end is connected with a liquid nitrogen storage tank. Multiple experimental strips can be placed on the sample tray at the same time, which is convenient to measure the mechanical parameters of the same material at different temperatures, facilitates the development of experiments, effectively shortens the experimental time, reduces the consumption of liquid nitrogen, and reduces the experimental cost.

Description

A low temperature nanoindentation experimental device

technical field

The utility model belongs to the technical field of superconducting material testing devices, in particular to a low-temperature nano-indentation testing device.

Background technique

With the development of nanotechnology, new nanostructures, nanomaterials and their excellent properties have been continuously discovered and recognized, and they have shown very broad application prospects. The rapid development of new nanomaterials urgently requires matching nanomechanical performance testing strategies. Due to the limitations of traditional testing methods, scientists have developed a nanoindentation testing method, which has gradually become a method for testing the basic mechanical properties of materials due to its advantages of no special requirements for samples and fast testing.

Although the nanoindentation test method has certain advantages over the traditional tension and compression test, most of the commercial nanoindentation test devices on the market can only achieve room temperature and high temperature tests, and rarely involve low temperature environments. With the rapid development of superconducting technology, high-speed transportation and other fields, the performance testing of superconducting materials has attracted everyone's attention. However, superconducting materials can fully exert their properties only in a low temperature environment (4.2-77K), so it is very important for nanoindentation test research in low temperature environment.

Although some laboratories have tried to design the nanoindentation device in low temperature environment, it has not been widely recognized and promoted due to its lack of design experience.

Utility model content

The purpose of the utility model is to solve the problem that the existing nano-indentation test device is difficult to test the superconducting material.

For this reason, the utility model adopts the following technical solutions:

A low-temperature nano-indentation experimental device, comprising a horizontal worktable, the center of the worktable is a circular cavity passing through, the circular cavity is trapezoidal, and has a large upper end opening and a small lower end opening; The middle part of the hollow cavity is fixedly connected with a heat exchange plate, and the heat exchange plate cuts off the upper and lower ends of the circular cavity;

A disk-shaped sample tray is placed above the heat exchange plate, and the sample tray is close to the heat exchange plate; the upper surface of the sample tray is provided with a ring-shaped rack and a number of ring-shaped sample clamping components, and the rack is engaged with a gear, the gear is connected with a servo motor; the outer edge of the sample tray is connected with a number of rollers, and the rollers are close to the inner wall of the circular cavity;

A vacuum cover is arranged above the worktable, a circular opening is arranged at the top of the vacuum cover, and a pressure rod of the testing machine is passed through the opening, and a A sealing ring; a liquid-nitrogen storage tank is connected to a liquid nitrogen storage tank at the tail end of the liquid-nitrogen storage tank.

Further, the clamping assembly includes two arc-shaped clamping elastic pieces arranged in parallel, one end of the clamping elastic pieces is fixedly connected with the sample tray, and the other end can press the experimental material; the lower surface of the front end of the clamping elastic pieces is also A chip temperature sensor is connected.

Further, the clamping assemblies are evenly arranged along a ring, and when the sample tray rotates, each clamping assembly passes right below the pressure rod in sequence.

Further, a closed base is provided below the workbench, and the interior of the base is a cavity, the catheter is inserted through one side of the base, and an exhaust hole is also provided on the other side of the base. An exhaust pipe is connected to the exhaust hole.

Further, the lower surface of the worktable and the outer side of the base are covered with heat insulation boards.

Further, the upper surface of the worktable is provided with a fixing groove for placing the vacuum cover.

Further, both the heat exchange plate and the sample tray are made of copper.

The beneficial effect of the utility model is that: multiple groups of experimental materials can be placed on the sample receiving tray at the same time, which is convenient for measuring the mechanical parameters of the same material at different temperatures, or the mechanical parameters of different materials, which is conducive to carrying out experiments and can effectively shorten the Test time, while reducing liquid nitrogen consumption and test costs.

Description of drawings

Fig. 1 is the structural front view of the present utility model;

Fig. 2 is a partial enlarged view of part A in Fig. 1;

Fig. 3 is the top view of the structure of the working platform;

In the picture: 1- worktable, 2- circular cavity, 3- heat exchange plate, 4- sample tray, 5- clamping spring, 6- rack, 7- servo motor, 8- vacuum cover, 9- Pressure rod, 10-seal ring, 11-fixed groove, 12-base, 13-conduit, 14-spray head, 15-vent hole, 16-roller, 17-insulation plate, 18-gear.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figures 1 to 3, a low-temperature nano-indentation experimental device consists of a base 12, a worktable 1, a vacuum cover 8 and a testing machine in order from bottom to top. The center of the worktable 1 is a circular cavity 2 penetrating through, and the circular cavity 2 is trapezoidal with a large opening at the upper end and a small opening at the lower end. A copper heat exchange plate 3 is fixedly connected to the middle step of the circular cavity 2 , and the heat exchange plate 3 cuts off the upper and lower ends of the circular cavity 2 .

A disk-shaped copper sample tray 4 is placed above the heat exchange plate 3 , and the diameter of the sample tray 4 is smaller than the opening diameter of the upper end of the circular cavity 2 . The sample tray 4 is in close contact with the heat exchange plate 3, and the upper surface of the sample tray 4 is provided with six sample clamping assemblies that are evenly arranged in a ring shape. One end of the elastic piece 5 is fixedly connected with the sample tray 4 , and the other end can press the experimental material. The upper surface of the sample tray 4 is also provided with a ring-shaped rack 6 . The rack 6 is engaged with a gear 18 and a servo motor 7 connected to the gear 18 , and the servo motor 7 is fixedly connected to the worktable 1 . A plurality of rollers 16 are connected to the outer edge of the sample tray 4 , and the rollers 16 are in close contact with the inner wall of the circular cavity 2 . When the servo motor 7 rotates, the sample tray 4 can be driven to rotate around the center by the gear 18 and the rack 6 .

A vacuum cover 8 is provided above the worktable 1 , and a fixing groove 11 for placing the vacuum cover 8 is provided on the upper surface of the worktable 1 . The top of the vacuum cover 8 is provided with a circular opening through which the pressure rod 9 of the testing machine extends into the vacuum cover 8 , and a sealing ring 10 is provided between the pressure rod 9 and the vacuum cover 8 . When the sample tray 4 is rotated, the experimental materials placed on each clamping assembly pass right below the pressure rod 9 in sequence.

The base 12 below the worktable is sealed, and the interior of the base 12 is a cavity, and two sides of the base 12 are respectively provided with an opening. The catheter 13 for conveying liquid nitrogen is penetrated through an opening on one side of the base 12, and is wound in a disc shape under the sample tray 4. The disc-shaped catheter 13 is connected with a number of vertically upward nozzles 14, The front end of the spray head 14 is close to the lower surface of the sample tray 4 , and the rear end of the catheter 13 is connected to a liquid nitrogen storage tank. The opening on the other side of the base 12 forms an exhaust hole 15 , and an exhaust pipe is connected to the exhaust hole 15 . In addition, in order to prevent external heat conduction from affecting the experiment, the lower surface of the worktable 1 and the outer side of the base 12 are covered with a thermal insulation board 17, which can be made of rock wool or a multi-layer vacuum board.

A control system is also provided on one side of the experimental device, and a data recording and analysis system is arranged on the control system, and the data recording and analysis systems all adopt the existing technology. At the same time, there is also a thermostat, which can display the temperature value measured by each temperature sensor in real time. The controller is also signal-connected with the servo motor 7. In the initial position, the lower part of the pressure rod 9 is facing an experimental material. Each time the servo motor 7 works, the sample tray 4 rotates 60 degrees, so that the next group of experimental strips is aligned with the pressure bar 9 .

The working principle of the present utility model is as follows:

During the test, first open the vacuum cover 8 and install the experimental material under the clamping elastic piece 5 to ensure that the material is flat and close to the sample tray 4. After installing each experimental material in place, put down the vacuum cover 8, and then discharge the vacuum cover 8. Air.

After a certain degree of vacuum is reached in the vacuum cover 8 , the liquid nitrogen tank is opened to spray liquid nitrogen below the heat exchange plate 3 through the conduit 13 . A high-pressure nitrogen tank can be connected to the liquid nitrogen tank, and the liquid nitrogen in the liquid nitrogen tank is pressed out by the high-pressure nitrogen gas. After the liquid nitrogen is sprayed to the bottom of the heat exchange plate 3, it vaporizes rapidly and reduces the temperature of the heat exchange plate 3. After the temperature of the heat exchange plate 3 decreases, the heat on the sample tray 4 is taken away. Likewise, the temperature of the experimental material was also decreased.

When the temperature was lowered to the temperature required for the experiment, the press was controlled to test each experimental material. The sample tray 4 is driven to rotate by the servo motor 7 in real time, so as to measure the mechanical properties of other experimental materials.

It should be noted that the above are only some embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and replacements can be made without departing from the technical principles of the present invention. , these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims (7)

1. A low-temperature nano-indentation experimental device, characterized in that it comprises a horizontal worktable (1), the center of the worktable (1) is a circular cavity (2) passing through, and the circular The cavity (2) is trapezoidal, with a large opening at the upper end and a small opening at the lower end; a heat exchange plate (3) is fixedly connected to the middle of the circular cavity (2), and the heat exchange plate (3) blocks the circular cavity ( 2) the upper and lower ends; A disk-shaped sample tray (4) is placed above the heat exchange plate (3), and the sample tray (4) is in close contact with the heat exchange plate (3); the upper surface of the sample tray (4) is provided with a ring-shaped rack (6). ) and a number of annularly arranged sample holding assemblies, a gear (18) is engaged with the rack (6), and a servo motor (7) is connected to the gear (18); the outer surface of the sample tray (4) is A plurality of rollers (16) are connected to the edge, and the rollers (16) are in close contact with the inner wall of the circular cavity (2); A vacuum hood (8) is arranged above the worktable (1), a circular opening is arranged on the top of the vacuum hood (8), and a pressure rod (9) of a testing machine is pierced through the opening. , a sealing ring (10) is arranged between the pressure rod (9) and the vacuum cover (8); a disc-shaped liquid conduit (13) is arranged under the sample tray (4), and the liquid conduit A plurality of vertically upward spray heads (14) are connected to the pipe (13), and a liquid nitrogen storage tank is connected to the tail end of the catheter (13). 2 . The low-temperature nanoindentation experiment device according to claim 1 , wherein the clamping assembly comprises two arc-shaped clamping elastic pieces ( 5 ) arranged side by side, and one end of the clamping elastic piece ( 5 ) is It is fixedly connected with the sample tray (4), and the other end can be pressed against the experimental material; the lower surface of the front end of the clamping elastic piece (5) is also connected with a patch-type temperature sensor. 3. The low-temperature nanoindentation experiment device according to claim 2, wherein the clamping components are evenly arranged along a ring, and when the sample tray (4) rotates, each clamping component passes through the pressure rod (9) in sequence. ) directly below. 4 . The low-temperature nanoindentation experimental device according to claim 1 , wherein a closed base ( 12 ) is arranged below the workbench, and the interior of the base ( 12 ) is a cavity, and the catheter (13) is penetrated by one side of the base (12), the other side of the base (12) is further provided with an exhaust hole (15), and an exhaust pipe is connected to the exhaust hole (15). 5 . The low-temperature nano-indentation experiment device according to claim 4 , characterized in that, the lower surface of the worktable ( 1 ) and the outer side of the base ( 12 ) are covered with a heat insulation board ( 17 ). 6 . 6 . The low-temperature nano-indentation experiment device according to claim 1 , wherein a fixing groove ( 11 ) for placing a vacuum cover ( 8 ) is formed on the upper surface of the worktable ( 1 ). 7 . 7 . The low-temperature nano-indentation experiment device according to claim 1 , wherein the heat exchange plate ( 3 ) and the sample tray ( 4 ) are made of copper material. 8 .

Images