A high temperature mechanical simulation and in-situ observation device

Abstract

The present invention discloses a high-temperature mechanical simulation and in-situ observation device, comprising a high-temperature environment box (13), wherein a sample (12) is horizontally penetrated through the middle of the high-temperature environment box (13), and both ends of the sample (12) are located outside the high-temperature environment box (13), and both ends of the sample (12) are connected to a load unit through a clamp (10). The high-temperature mechanical simulation and in-situ observation device provided by the present invention can realize in-situ observation of high-temperature service behavior. Different from traditional high-temperature testing machines, the present device uses left and right screws. During the loading process, both ends of the sample move relative to each other, and the center of the sample remains stationary, thereby realizing in-situ observation of a specific area. The device of the present invention has a simple structure, low cost, easy operation, and complete functions, and can obtain scientific and true experimental results.

Description

Technical Field

[0001] The invention relates to a high temperature mechanical simulation and in-situ observation device, which is suitable for simulating and in-situ observing the high temperature mechanical behavior of a material and belongs to the technical field of material testing. Background Art

[0002] The change of mechanical behavior of materials in high temperature environment is a common concern of material researchers. Simulating and in-situ observing the high temperature mechanical behavior of materials is the key to evaluating the high temperature service of materials. At present, the evaluation of high temperature mechanical behavior of materials mainly uses high temperature testing machines, as described in the patent publication (CN 107607411 A). High temperature testing machines usually use resistance wire heating, and the fixture needs to be placed in the environmental chamber together with the sample during the experiment. There are the following shortcomings during use: (1) Slow heating speed (2) During the loading process, one end of the sample is fixed, and the other end is gradually loaded to cause the sample to stretch, so the observation field moves, making it difficult to observe the change process of a specific area in situ; (3) The fixture and the sample are placed in the high temperature environmental chamber at the same time, and the fixture needs to be made of high temperature resistant materials. For this reason, it is urgent to design a high temperature mechanical simulation and in-situ observation device that can simulate the high temperature mechanical behavior of materials under different load forms and realize in-situ observation of specific areas, so as to scientifically evaluate and observe the high temperature service process of materials. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the present invention provides a high-temperature mechanical simulation and in-situ observation device, which can truly simulate and in-situ observe the high-temperature mechanical behavior of materials. During the experiment, the temperature is controllable, the morphology changes are observable, and the loading load is controllable. It is suitable for simulating and observing the high-temperature service behavior of materials.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A high-temperature mechanical simulation and in-situ observation device comprises a high-temperature environment box, a sample is horizontally passed through the middle of the high-temperature environment box, both ends of the sample are located outside the high-temperature environment box, and both ends of the sample are connected to a load unit through a clamp;

[0006] The high temperature environment box comprises a main test box, and a sealing unit is arranged on both the left and right sides of the main test box, and the sealing unit comprises a cavity-type shell composed of inner and outer walls, and the interior of the sealing unit is hollow, and the left and right sides of the sealing unit are provided with through holes for penetrating the sample, and the left and right sides of the interior of the sealing unit are provided with annular Y-shaped high temperature resistant rubber sealing rings, and a plurality of magnetic balls are filled between the two Y-shaped high temperature resistant rubber sealing rings, and a liquid storage unit is arranged above the sealing unit, and the interior of the liquid storage unit is filled with magnetorheological fluid, and the liquid storage unit is connected with the interior of the sealing unit, and the upper and lower ends of the shell are respectively connected with cooling water inlets, and the shell is a cooling water channel;

[0007] A number of semi-gold-plated reflective infrared heating quartz tubes are arranged in the main test box. The semi-gold-plated reflective infrared heating quartz tubes include semi-gold-plated reflective arc surfaces and infrared heating quartz tubes. The arc center angles of all the semi-gold-plated reflective arc surfaces are facing the sample and are evenly distributed. The side of the semi-gold-plated reflective arc surface facing the sample is coated with a gold-plated layer. The infrared heating quartz tube is located at the center of the semi-gold-plated reflective arc surface. A temperature sensor is arranged near the sample, and an observation window facing the center of the sample is opened on the outer wall of the main test box.

[0008] The diameter of the magnetic ball is in the micron level, and the surface of the magnetic ball is coated with a piezoelectric ceramic coating.

[0009] The load unit includes a stress sensor connected to the clamp on one side, the outer side of the stress sensor and the outer side of the clamp on the other side are respectively connected to the nut seat, two left and right screw rods pass through the upper and lower ends of the nut seat through bearings respectively, one end of the two left and right screw rods are movably connected to the screw rod support seat, and the other ends of the two left and right screw rods are connected to the turbine, the turbine is vertically meshed with the gear on the worm, the worm is fixed on the bearing support seat, and the worm is provided with a gear 1, which is meshed with a gear 2 on the motor.

[0010] The two left and right screw rods are connected to the transmission seat through bearings.

[0011] The sealing unit is connected to the main test box through a metal rubber ring and a flange.

[0012] The infrared heating quartz tube, the stress sensor, the temperature sensor and the motor are all connected to a controller; the infrared heating quartz tube, the stress sensor, the temperature sensor, the motor and the controller are all powered by a power supply.

[0013] The inner diameter of the end of the Y-shaped high temperature resistant rubber sealing ring is 0-0.3 mm smaller than the outer diameter of the sample, and the gap between the magnetic ball and the sample is 0-0.3 mm.

[0014] The Y-shaped high temperature resistant rubber sealing ring is a double fluorine rubber ring containing nano magnesium oxide or nano aluminum oxide, and the surface of the nano magnesium oxide or nano aluminum oxide is compositely modified by magnesium stearate and maleic anhydride;

[0015] The method for composite modification of the surface of nano magnesium oxide or nano aluminum oxide is:

[0016] 1) Mix magnesium stearate with nano magnesium oxide or nano aluminum oxide, wherein the weight ratio of magnesium stearate to nano magnesium oxide or nano aluminum oxide is 1:(8-13), add into a beaker, and pour into ethyl acetate to obtain a mixed solution, wherein the weight volume ratio of magnesium stearate to ethyl acetate is 1:5-1:20 g / L;

[0017] 2) The mixed solution in step 1) is placed in a magnetic stirrer at 50°C to 90°C and stirred for 1 to 4 hours, then 0.5 g / L to 10 g / L maleic anhydride is added and stirred for another 1 to 4 hours, and then the temperature is raised to 90°C to 100°C to volatilize the ethyl acetate;

[0018] 3) After the ethyl acetate is volatilized, the mixture is filtered and dried under vacuum to obtain surface-composite-modified nano-magnesium oxide or nano-aluminum oxide particles;

[0019] The content of the surface composite-modified nano magnesium oxide or nano aluminum oxide in the Y-shaped high-temperature resistant rubber sealing ring is 5-15%.

[0020] The metal rubber ring is made of a spiral metal wire through cold stamping. The metal wire is made of one or more of 0Cr18Ni9Ti and 1Cr18Ni9Ti. The diameter of the metal wire is 0.05 mm to 0.15 mm.

[0021] The material of the observation window includes quartz; the top of the liquid storage unit is provided with a plug for convenient liquid addition and sealing.

[0022] The working temperature range of the samples in the high temperature environment box is 0-700°C. The high temperature environment box is made of stainless steel and the inner lining is fire-resistant and heat-insulating material.

[0023] The present invention has the following beneficial effects:

[0024] 1) The present invention has fast heating speed and is economical and applicable. Different from the traditional resistance wire heating, the present invention can achieve rapid heating of the local area of ​​the sample through the infrared focusing of the semi-gold-plated reflective infrared heating quartz. Therefore, the fixture does not need to be placed in the environmental chamber, and there is no special requirement for the material of the fixture, which is economical and applicable.

[0025] 2) The dynamic sealing technology of the present invention can achieve sealing under dynamic load. The device achieves sealing under dynamic load through the coupling effect of the mechanical seal of the rubber ring and the dynamic seal of the magnetic fluid. The Y-type high temperature resistant rubber sealing ring is added with surface-modified nano-magnesium oxide or nano-aluminum oxide, which can effectively improve the high temperature resistance of the rubber sealing ring without reducing the elasticity of the rubber ring. At the same time, on the one hand, the Y-type high temperature resistant rubber sealing ring not only prevents the leakage of hot air, but also prevents the magnetorheological fluid from leaking into the internal main test box and the external environment under the action of dynamic load. On the other hand, the magnetic ball can not only limit the movement of the rubber ring, but also continuously provide a magnetic field to achieve magnetic fluid sealing, further inhibiting the leakage of hot air. At the same time, unlike other magnetic fluid sealing technologies, each magnetic ball can become a sealing unit, which can gradually reduce the pressure on the magnetic fluid, and play an effect similar to a labyrinth seal, so the sealing effect is excellent.

[0026] 3) The present invention can realize in-situ observation of high-temperature service behavior. Different from the traditional high-temperature testing machine, this device uses a left-right screw. During the loading process, both ends of the sample move relative to each other, and the center of the sample remains stationary, so in-situ observation of a specific area can be realized.

[0027] 4) The present invention has good magnetic stability. Generally, magnetic materials are prone to magnetic decay at high temperatures. The present invention uses cooling water channels to reduce the temperature of the magnetic ball. On the other hand, when the sample is subjected to a load, the piezoelectric ceramics on the surface of the magnetic ball generate current under the force, which can continuously magnetize the magnetic ball and keep the magnetic properties of the magnetic ball stable.

[0028] The device of the present invention has the advantages of simple structure, low cost, easy operation and complete functions, and can obtain scientific and real experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the high temperature environment box in the present invention;

[0031] Figure 3 It is a structural schematic diagram of the main test box in the present invention.

[0032] In the figure: 1-motor, 2-gear 2, 3-worm, 4-bearing support seat, 5-turbine, 6-transmission seat, 7-left and right rotating screw, 8-nut seat, 9-stress sensor, 10-clamp, 11-screw support seat, 12-sample, 13-high temperature environment chamber, 14-main test chamber, 15-sealing unit, 16-liquid storage unit, 17-plug, 18-metal rubber ring, 19-flange, 20-semi-gold-plated reflective infrared heating quartz tube, 21-temperature sensor, 22-observation window, 23-magnetic ball, 24-Y-type high temperature resistant rubber sealing ring, 25-cooling water inlet, 26-cooling water channel. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0034] Example 1

[0035] like Figure 1 As shown, a high-temperature mechanical simulation and in-situ observation device includes a motor 1, a gear 2, a worm 3, a bearing support seat 4, a turbine 5, a transmission seat 6, left and right screws 7, a nut seat 8, a stress sensor 9, a fixture 10, a screw support seat 11, a sample 12, and a high-temperature environmental box 13; wherein the worm 3 is connected to the bearing support seat 4 through a bearing, and the worm 3 is engaged with the turbine 5 to form a reduction mechanism; the left and right screws 7 are connected to the transmission seat 6 and the screw support seat 11 through bearings; the fixture 10 on the left is connected to the nut seat 8 on the left through the stress sensor 9; the motor 1 is used to control the stress size and frequency; the high-temperature environmental box 13 is used to simulate a high-temperature environment.

[0036] like Figure 2 As shown, the high temperature environment box 13 includes a main test box 14, two left and right sealing units 15, a liquid storage unit 16, a plug 17, a metal rubber ring 18 and a flange 19; the sealing unit 15 is connected to the main test box 14 through the metal rubber ring 18 and the flange 19, and there are holes on the upper part of the sealing unit 15 for adding magnetorheological fluid, and the magnetorheological fluid is located inside the liquid storage unit 16; the main test box 14 includes four semi-gold-plated reflective infrared heating quartz tubes 20, a temperature sensor 21 and an observation window 22 made of quartz material, wherein the observation window 22 is used for in-situ observation; the sealing unit 15 includes a magnetic ball 23, a Y-shaped high temperature resistant rubber sealing ring 24, a cooling water inlet 25, and a cooling water channel 26.

[0037] like Figure 3 As shown, the main test box 14 includes four symmetrically distributed semi-gold-plated reflective infrared heating quartz tubes 20 , and the concave surface of the semi-gold-plated reflective layer is focused onto the sample 12 .

[0038] Specifically, the connection relationship between the above components is:

[0039] A high-temperature mechanical simulation and in-situ observation device, comprising a high-temperature environment box 13, a sample 12 is horizontally passed through the middle of the high-temperature environment box 13, both ends of the sample 12 are located outside the high-temperature environment box 13, and both ends of the sample 12 are connected to a load unit through a fixture 10;

[0040] The high temperature environment box 13 includes a main test box 14, and sealing units 15 are arranged on the left and right sides of the main test box 14. The sealing unit 15 includes a cavity shell composed of inner and outer walls. The interior of the sealing unit 15 is hollow, and the left and right sides of the sealing unit 15 are provided with through holes for penetrating the sample 12. The left and right sides of the interior of the sealing unit 15 are provided with an annular Y-shaped high temperature resistant rubber sealing ring 24. The specific structure of the Y-shaped high temperature resistant rubber sealing ring 24 is as follows: it includes an annular rubber sealing ring body, and the upper surface and the lower surface of the rubber sealing ring body are symmetrically provided with concave arcs, and one side of the rubber sealing ring body is provided with A V-shaped groove is provided, the opening depth of the V-shaped groove is on the same vertical line as the center of the arc, the angle of the V-shaped groove is 20~50°, and the central angle of the arc is 60~90°; a number of magnetic balls 23 are filled between the two Y-shaped high-temperature resistant rubber sealing rings 24, a liquid storage unit 16 is provided above the sealing unit 15, the liquid storage unit 16 is filled with magnetorheological fluid, and a plug 17 is provided on the top of the liquid storage unit 16 for convenient liquid addition and sealing, the liquid storage unit 16 is connected to the inside of the sealing unit 15 through a pipeline, and the upper and lower ends of the shell are respectively connected with cooling water inlets 25, and the shell is a cooling water channel 26.

[0041] A number of semi-gold-plated reflective infrared heating quartz tubes 20 are arranged in the main test box 14. The semi-gold-plated reflective infrared heating quartz tubes 20 include semi-gold-plated reflective arc surfaces and infrared heating quartz tubes. The arc center angles of all the semi-gold-plated reflective arc surfaces are facing the sample 12 and are evenly distributed. The side of the semi-gold-plated reflective arc surface facing the sample 12 is coated with a gold-plated layer, and the infrared heating quartz tube is located at the center of the semi-gold-plated reflective arc surface; a temperature sensor 21 is arranged near the sample 12, and an observation window 22 facing the center position of the sample 12 is opened on the outer wall of the main test box 14.

[0042] The diameter of the magnetic ball 23 is in the micrometer range, for example, 100-300 μm, and the surface of the magnetic ball 23 is coated with a piezoelectric ceramic coating.

[0043] The load unit includes a stress sensor 9 connected to the clamp 10 on one side, the outer side of the stress sensor 9 and the outer side of the clamp 10 on the other side are respectively connected to the nut seat 8, and the two left and right screw rods 7 pass through the upper and lower ends of the nut seat 8 respectively through bearings, and the left and right sides of the left and right screw rods 7 are respectively provided with threads with opposite spiral directions; one end of the two left and right screw rods 7 is movably connected (connected by bearings) to the screw support seat 11, and the other ends of the two left and right screw rods 7 are connected to the turbine 5, and the turbine 5 is vertically meshed with the gear on the worm 3, and the worm 3 is fixed on the bearing support seat 4 through a bearing, and the worm 3 is provided with a gear 1, and the gear 1 is meshed with the gear 2 2 on the motor 1.

[0044] A transmission seat 6 is connected between the two left and right screw rods 7 via a bearing. The arrangement of the transmission seat 6 further enables the two left and right screw rods 7 to rotate synchronously.

[0045] The sealing unit 15 is connected to the main test box 14 via a metal rubber ring 18 and a flange 19 .

[0046] The infrared heating quartz tube, the stress sensor 9, the temperature sensor 21 and the motor 1 are all connected to a controller; the infrared heating quartz tube, the stress sensor 9, the temperature sensor 21, the motor 1 and the controller are all powered by a power supply.

[0047] The inner diameter of the end of the Y-shaped high temperature resistant rubber sealing ring 24 is 0-0.3 mm smaller than the outer diameter of the sample 12, and the gap between the magnetic ball 23 and the sample 12 is 0.01 mm.

[0048] The Y-shaped high temperature resistant rubber seal ring 24 is a double fluorine rubber ring containing nano magnesium oxide or nano aluminum oxide, and the surface of the nano magnesium oxide or nano aluminum oxide is compositely modified by magnesium stearate and maleic anhydride;

[0049] The method for composite modification of the surface of nano magnesium oxide or nano aluminum oxide is:

[0050] 1) Mix magnesium stearate with nano magnesium oxide or nano aluminum oxide equivalent to 8 times the amount of magnesium stearate, add to a beaker, and pour in an appropriate amount of ethyl acetate to obtain a mixed solution, the weight volume ratio of magnesium stearate to ethyl acetate is 1:5g / L;

[0051] 2) The mixed solution in step 1) was placed in a magnetic stirrer at 50°C and stirred for 2 hours, followed by the addition of 0.5 g / L maleic anhydride and stirring for another 2 hours, and then the temperature was raised to 95°C to volatilize the ethyl acetate;

[0052] 3) After the ethyl acetate is volatilized, the mixture is filtered and dried under vacuum to obtain surface-composite-modified nano-magnesium oxide or nano-aluminum oxide particles;

[0053] The content of the surface composite-modified nano magnesium oxide or nano aluminum oxide in the Y-shaped high temperature resistant rubber sealing ring 24 is 5%.

[0054] The metal rubber ring 18 is made of a spiral metal wire through cold stamping. The metal wire is made of one or more of 0Cr18Ni9Ti and 1Cr18Ni9Ti. The diameter of the metal wire is 0.05 mm to 0.15 mm.

[0055] In this embodiment, the material of the test piece 12 selected is magnesium alloy, with a length of 120 mm and a diameter of 4 mm. The main test box 14 is made of stainless steel and lined with refractory bricks. The metal rubber ring 18 is made of 0Cr18Ni9Ti stainless steel wire with a diameter of 0.05 mm. The diameter of the magnetic ball 23 is 300 μm, and the surface of the magnetic ball 23 is coated with a barium titanate piezoelectric coating. The selected Y-type high-temperature resistant rubber sealing ring 24 has an inner diameter of 4.02 mm. The Y-type high-temperature resistant rubber sealing ring 24 is a double fluororubber ring containing nano-magnesium oxide, and the surface of the nano-magnesium oxide is composite-modified with magnesium stearate and maleic anhydride. The heating temperature of the high-temperature environment box 13 is 10°C. The mechanical properties of the magnesium alloy at the current temperature can be tested by controlling the rotation of the motor 1. The service process can be observed through the glass window 22 using an optical microscope. Before use, this embodiment is magnetized by an external magnetic field. After magnetization, the magnetic balls 23 are regularly arranged on the inner wall of the sealing unit 15, so that it is convenient for the sample 12 to pass through the high temperature environment box 13 and for the sealing unit 15 to clamp the sample 12.

[0056] Example 2

[0057] The difference between this embodiment and embodiment 1 is that the material of the test piece 12 is a low-carbon steel bar with a length of 100 mm and a diameter of 3 mm. The main test box 14 is made of stainless steel and lined with fire-resistant asbestos. The material of the metal rubber ring 18 is 1Cr18Ni9Ti stainless steel wire with a diameter of 0.15 mm. The diameter of the magnetic ball 23 is 200 μm. The surface of the magnetic ball 23 is coated with a strontium barium metaniobate piezoelectric coating. The inner diameter of the Y-type high-temperature resistant rubber sealing ring is 3.3 mm. The Y-type high-temperature resistant rubber sealing ring is a double fluororubber ring containing nano-magnesium oxide. The surface of the nano-magnesium oxide is composite-modified with magnesium stearate and maleic anhydride. The composite modification process is as follows: First, magnesium stearate and nano magnesium oxide equivalent to 10 times the weight of magnesium stearate are mixed and added to a beaker, and an appropriate amount of ethyl acetate is poured in to obtain a mixed solution, the added volume of ethyl acetate being equivalent to 20 times the weight of magnesium stearate; the mixed solution is placed in a 90°C magnetic stirrer and stirred for 1 hour, then 10g / L of maleic anhydride is added and stirred for another 4 hours, and then the temperature is raised to 100°C to volatilize the ethyl acetate; after the ethyl acetate is volatilized, it is filtered and dried in a vacuum to obtain nano magnesium oxide particles compositely modified with magnesium stearate and maleic anhydride, wherein the content of the surface composite modified nano magnesium oxide or nano aluminum oxide in the Y-type high temperature resistant rubber sealing ring 24 is 15%. The gap between the magnetic ball 23 and the sample is 0.3mm, the heating temperature of the high temperature environment box 13 is 600°C, and the high temperature mechanical properties of the low carbon steel bar under high temperature can be tested by controlling the rotation of the motor 1, and the service process can be observed through the glass window 22 using a metallographic microscope.

[0058] Example 3

[0059] The difference between this embodiment and embodiment 1 is that: the material of the test piece 12 is an aluminum alloy rod with a length of 80 mm and a diameter of 4 mm; the main test box 14 is made of stainless steel and lined with refractory ceramics; the metal rubber ring 18 is made of a composite of 0Cr18Ni9Ti stainless steel wire and 1Cr18Ni9Ti stainless steel wire, with diameters of 0.08 mm and 0.12 mm respectively; the diameter of the magnetic ball 23 is 100 μm, and the surface of the magnetic ball 23 is coated with a barium titanate piezoelectric coating; the inner diameter of the Y-type high-temperature resistant rubber sealing ring is 4.1 mm, and the Y-type high-temperature resistant rubber sealing ring is a double fluororubber ring containing nano-alumina, and the surface of the nano-alumina is treated with magnesium stearate and maleic anhydride. Composite modification, the modification process is: first, magnesium stearate and nano-alumina equivalent to 13 times the weight of magnesium stearate are mixed and added to a beaker, and an appropriate amount of ethyl acetate is poured to obtain a mixed solution, and the added volume of ethyl acetate is equivalent to 10 times the weight of magnesium stearate; the mixed solution is placed in a 50°C magnetic stirrer and stirred for 4 hours, then 5g / L of maleic anhydride is added and stirred for another 1 hour, and then the temperature is raised to 90°C to volatilize the ethyl acetate; after the ethyl acetate is volatilized, it is filtered and dried in a vacuum to obtain nano-alumina particles compositely modified with magnesium stearate and maleic anhydride, wherein the content of the surface composite-modified nano-magnesium oxide or nano-alumina in the Y-type high-temperature resistant rubber sealing ring 24 is 10%. The gap between the magnetic ball 23 and the sample is 0.1mm, the heating temperature of the high-temperature environment box 13 is 300°C, and the high-temperature mechanical properties of the aluminum alloy under high temperature can be tested by controlling the rotation of the motor 1, and the service process can be observed through the glass window 22 using an electron microscope.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high temperature mechanical simulation and in-situ observation device, characterized in that: It comprises a high temperature environment box (13), wherein a sample (12) is horizontally passed through the middle of the high temperature environment box (13), both ends of the sample (12) are located outside the high temperature environment box (13), and both ends of the sample (12) are connected to a load cell via a clamp (10); The high temperature environment box (13) comprises a main test box (14), the left and right sides of the main test box (14) are provided with sealing units (15), the sealing unit (15) comprises a cavity-type shell composed of inner and outer walls, the interior of the sealing unit (15) is hollow, the left and right sides of the sealing unit (15) are provided with through holes for penetrating the sample (12), the left and right sides of the interior of the sealing unit (15) are provided with annular Y-shaped high temperature resistant rubber sealing rings (24), a plurality of magnetic balls (23) are filled between the two Y-shaped high temperature resistant rubber sealing rings (24), a liquid storage unit (16) is provided above the sealing unit (15), the interior of the liquid storage unit (16) is filled with magnetorheological fluid, the liquid storage unit (16) is connected to the interior of the sealing unit (15), the upper and lower ends of the shell are respectively connected with cooling water inlets (25), and the shell is a cooling water channel (26); A plurality of semi-gold-plated reflective infrared heating quartz tubes (20) are arranged in the main test box (14), the semi-gold-plated reflective infrared heating quartz tubes (20) comprising semi-gold-plated reflective arc surfaces and infrared heating quartz tubes, the arc center angles of all the semi-gold-plated reflective arc surfaces are directly facing the sample (12) and are evenly distributed, the side of the semi-gold-plated reflective arc surface facing the sample (12) is coated with a gold-plated layer, and the infrared heating quartz tube is located at the center of the semi-gold-plated reflective arc surface; a temperature sensor (21) is arranged near the sample (12), and an observation window (22) facing the center of the sample (12) is opened on the outer wall of the main test box (14); The diameter of the magnetic ball (23) is in the micrometer range, and the surface of the magnetic ball (23) is coated with a piezoelectric ceramic coating; The sealing unit (15) is connected to the main test box (14) via a metal rubber ring (18) and a flange (19).

2. A high temperature mechanical simulation and in-situ observation device according to claim 1, characterized in that: The load unit comprises a stress sensor (9) connected to the clamp (10) on one side, the outer side of the stress sensor (9) and the outer side of the clamp (10) on the other side are respectively connected to the nut seat (8), two left and right screw rods (7) pass through the upper and lower ends of the nut seat (8) through bearings respectively, one end of the two left and right screw rods (7) are movably connected to the screw rod support seat (11), and the other ends of the two left and right screw rods (7) are connected to the turbine (5), the turbine (5) is vertically meshed with the gear on the worm (3), the worm (3) is fixed on the bearing support seat (4), the worm (3) is sleeved with a gear 1, and the gear 1 is meshed with a gear 2 (2) on the motor (1).

3. A high temperature mechanical simulation and in-situ observation device according to claim 2, characterized in that: The two left and right screw rods (7) are connected to the transmission seat (6) via bearings.

4. A high temperature mechanical simulation and in-situ observation device according to claim 2, characterized in that: The infrared heating quartz tube, the stress sensor (9), the temperature sensor (21) and the motor (1) are all connected to a controller; the infrared heating quartz tube, the stress sensor (9), the temperature sensor (21), the motor (1) and the controller are all powered by a power supply.

5. The high temperature mechanical simulation and in-situ observation device according to claim 1, characterized in that: The inner diameter of the end of the Y-shaped high temperature resistant rubber sealing ring (24) is 0-0.3 mm smaller than the outer diameter of the sample (12), and the gap between the magnetic ball (23) and the sample (12) is 0-0.3 mm.

6. A high temperature mechanical simulation and in-situ observation device according to claim 1, characterized in that: The Y-shaped high temperature resistant rubber sealing ring (24) is a double fluorine rubber ring containing nano magnesium oxide or nano aluminum oxide, and the surface of the nano magnesium oxide or nano aluminum oxide is compositely modified with magnesium stearate and maleic anhydride; The method for composite modification of the surface of nano magnesium oxide or nano aluminum oxide is: 1) Mix magnesium stearate with nano magnesium oxide or nano aluminum oxide, wherein the weight ratio of magnesium stearate to nano magnesium oxide or nano aluminum oxide is 1:(8-13), add into a beaker, and pour into ethyl acetate to obtain a mixed solution, wherein the weight volume ratio of magnesium stearate to ethyl acetate is 1:5-1:20 g / L; 2) The mixed solution in step 1) is placed in a magnetic stirrer at 50°C to 90°C and stirred for 1 to 4 hours, then 0.5 g / L to 10 g / L maleic anhydride is added and stirred for another 1 to 4 hours, and then the temperature is raised to 90°C to 100°C to volatilize the ethyl acetate; 3) After the ethyl acetate is volatilized, the mixture is filtered and dried under vacuum to obtain surface-composite-modified nano-magnesium oxide or nano-aluminum oxide particles; The content of the surface composite-modified nano magnesium oxide or nano aluminum oxide in the Y-shaped high temperature resistant rubber sealing ring (24) is 5-15%.

7. The high temperature mechanical simulation and in-situ observation device according to claim 1, characterized in that: The metal rubber ring (18) is made of a spiral metal wire by cold stamping, the metal wire is made of one or more of 0Cr18Ni9Ti and 1Cr18Ni9Ti, and the diameter of the metal wire is 0.05 mm to 0.15 mm.

8. The high temperature mechanical simulation and in-situ observation device according to claim 1, characterized in that: The material of the observation window (22) includes quartz; the top of the liquid storage unit (16) is provided with a plug (17) for convenient liquid addition and sealing.

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