Resistance test system in slurry injection process and test method thereof

Abstract

The invention relates to the field of material performance evaluation, in particular to a resistance testing system and method in the slurry injection process, the testing system comprises a stress loading part and a testing clamp, and the testing clamp comprises an upper clamp, a lower clamp and an injector clamp; the upper clamp comprises a first connecting part and a first clamping assembly, and the position of the first clamping assembly relative to the first connecting part is adjustable up and down; the lower clamp comprises a second connecting part, an object carrying platform and a second clamping assembly, the position of the second clamping assembly relative to the object carrying platform is vertically adjustable, and the rotation angle of the lower clamp relative to the base is adjustable. According to the method, the mechanical property change in the injection process can be monitored in real time, the mechanical property of the slurry in the carbon fiber preform injection process can be accurately evaluated, the test accuracy and reliability are improved, an evaluation standard is provided for the applicability of a ceramic matrix composite prepared by an injection impregnation process, and the method is suitable for popularization and application. And an optimization basis is provided for improving the distribution uniformity of the components in the composite material.

Description

Technical Field

[0001] The invention relates to the field of material performance evaluation, and in particular to a resistance testing system and a testing method thereof during slurry injection. Background Art

[0002] Ceramic-based composites retain the excellent properties of traditional ceramics, such as high temperature resistance and high strength, while overcoming its brittle defects. Not only are they insensitive to cracks, they will not suffer catastrophic damage under load, and are therefore widely used in thermal protection components of aerospace vehicles. Compared with single-phase ceramics, the manufacturing process of ceramic-based composites is relatively complex, the preparation cycle is long, the equipment requirements are high, and the preparation cost is high. The use of continuous fiber toughening is currently the best way to strengthen ceramics. Continuous fiber toughened ceramic-based composites generally refer to ultra-high temperature ceramics or multiphase ceramics as the matrix combined with high-temperature resistant fibers (reinforcements), such as carbon fibers, silicon carbide fibers, etc., to form ultra-high temperature ceramic-based composites with excellent properties such as high strength, high toughness, low density, and high temperature resistance.

[0003] There are mainly the following preparation methods for ceramic matrix composites.

[0004] (1) Chemical vapor infiltration, which deposits a ceramic matrix with a high melting point at a relatively low temperature, can be used to prepare ceramic-based composite components with complex structures. The pressure and temperature during the preparation process are low, and the mechanical and thermal damage to the fiber is relatively small. In addition, the composition and properties of the composite material can be regulated by designing the process conditions. The main disadvantages of chemical vapor infiltration are slow reaction rate, long preparation cycle, high energy consumption, and high cost. In addition, the preparation of ultra-high temperature ceramic phases in large components is prone to problems such as shallow penetration depth and different proportions of gas phase raw materials at different positions, resulting in inconsistent matrix composition in different parts of the product.

[0005] (2) Precursor infiltration pyrolysis. The temperature required for precursor infiltration pyrolysis is relatively low, and the mechanical damage and heat loss to the fiber / interface are relatively small. The equipment is simple and can achieve near-net forming. By designing the molecular structure of the precursor, the composition, structure and properties of the composite matrix can be controlled. By designing the fiber braid, composite materials with complex shapes can be prepared. However, the current use of the precursor infiltration pyrolysis method to prepare continuous fiber reinforced ultra-high temperature ceramic-based composites still has problems such as long densification cycle, high porosity of the composite material, difficulty in achieving complete density, and many closed pores in the material matrix. Ultra-high temperature ceramic precursors are difficult to synthesize, high cost, and unstable. These problems have limited the development of this process in the preparation of continuous fiber reinforced ultra-high temperature ceramic-based composites.

[0006] (3) Reactive melt infiltration: Compared with chemical vapor infiltration, reactive melt infiltration has low process cost and short material preparation cycle. The density of the prepared material is high, which can reach 98% of the theoretical density, and the matrix has few microcracks. The matrix composition can be adjusted, and multi-component matrices such as Zr-Si-C and Hf-Si-C can be prepared. It can be bonded to C / C preforms by diffusion bonding, which can not only give play to the advantages of high specific strength of C / C, but also make full use of the advantages of toughness, oxidation resistance and ablation resistance of ceramic matrix composites. However, due to the high preparation temperature, the high-temperature metal or alloy melt can easily corrode the fiber and the interface, resulting in the fiber and the interface being easily damaged, and the mechanical properties are seriously affected. Moreover, due to the control of reactive melt infiltration kinetics, the metal or alloy melt is not easy to be completely consumed, and large-sized metal residues are likely to appear in the matrix of the product. The above problems will seriously affect the mechanical properties and stability of the material at high temperature.

[0007] (4) Slurry infiltration: The advantage of the slurry is that the solid content of the slurry is high, which can quickly achieve the filling and loading of ceramic powder in the preform. However, through vacuum filtration or vacuum infiltration, ceramic particles are easily blocked on the surface of the fiber preform, thereby hindering its loading in the central area of ​​the preform.

[0008] Injection impregnation is a new method for rapid preparation of ceramic matrix composites, but during the injection process, the selection of parameters such as injection force, time, and slurry solid content relies on experience, which reduces the uniformity of the composition and performance of the prepared samples. In order to make the injection impregnation process controllable and further improve the performance of the composites prepared by this process through process parameter optimization, it is necessary to evaluate the mechanical properties of the slurry during the injection process of the carbon fiber preform and develop corresponding fixtures and test methods. Therefore, in order to optimize the parameters during the slurry injection process and observe the changes in force during the injection process, there is an urgent need for an effective test system and test method that can evaluate the mechanical properties of the slurry during the injection process of the carbon fiber preform and monitor the injection process in real time. Summary of the invention

[0009] In order to overcome the difficulty that existing equipment and technologies cannot effectively evaluate the changes in mechanical properties during slurry injection, the purpose of the present invention is to provide a resistance test system and test method during slurry injection. The present invention can accurately evaluate the mechanical properties of the slurry during the injection of carbon fiber preforms by real-time monitoring of the changes in mechanical properties during the injection process, improve the accuracy and reliability of the test, provide an evaluation standard for the applicability of the injection impregnation process to prepare ceramic-based composite materials, and also provide an optimization basis for improving the uniformity of component distribution in composite materials.

[0010] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0011] The present invention provides a resistance testing system during slurry injection, the testing system comprising a stress loading part and a testing fixture, the stress loading part comprising a base, a frame arranged on the base, a driving mechanism arranged on the top of the frame, and a detection component for detecting the driving load of the driving mechanism and detecting the displacement of the testing fixture, the testing fixture comprising an upper fixture connected to the driving end of the driving mechanism, a lower fixture located on the base, and a syringe fixture for clamping a syringe housing; the upper fixture comprises a first connecting part connected to the driving end and a first clamping component for clamping the syringe fixture, the position of the first clamping component relative to the first connecting part is adjustable up and down, and the upper fixture can be driven by the driving mechanism to rise and fall in the height direction; the lower fixture comprises a second connecting part connected to the base, a loading platform for loading a sample to be tested, and a second clamping component for clamping the syringe fixture, the position of the second clamping component relative to the loading platform is adjustable up and down, and the rotation angle of the lower fixture relative to the base is adjustable.

[0012] As a further optimization scheme of the present invention, the first connecting part includes a connecting plate and a pressure rod passing through the connecting plate, and the top of the pressure rod is connected to the driving end through a first adapter; the first clamping assembly includes two first side plates relatively arranged at both ends of the connecting plate, and the tops of the two first side plates are provided with a plurality of first mounting holes for fixing the connecting plates spaced apart along the height direction, and the bottoms of the two first side plates are used to clamp the syringe clamp.

[0013] As a further optimization scheme of the present invention, the bottoms of the two first side panels extend inward in a direction perpendicular to the first side panels to form a first extension panel, and there is a gap between the two first extension panels. The two first extension panels are provided with a first recess at the gap for placing the syringe clamp, and the top surfaces of the two first extension panels are provided with a pressing plate for pressing down and fixing the syringe clamp.

[0014] As a further optimization scheme of the present invention, the second clamping assembly includes a lifting plate installed on both sides of the loading platform through a lifting assembly, and a second side plate is fixed on the two lifting plates. The tops of the two second side plates extend inward in a direction perpendicular to the second side plates to form a second extension plate. There is a gap between the two second extension plates, and the two second extension plates are provided with a second pit for placing the syringe clamp at the gap. The tops of the two second extension plates are provided with a cover plate, and the two cover plates are provided with a second pit for placing the syringe clamp at the gap.

[0015] As a further optimization solution of the present invention, a plurality of second mounting holes are provided on the cover plate at intervals in the horizontal direction.

[0016] As a further optimization scheme of the present invention, the lifting assembly includes a connecting seat arranged on the side wall of the loading platform, a rack arranged on the inner side wall of the lifting plate, a rotating rod and a fixing buckle arranged on the connecting seat; the lifting plate is limitedly connected to the connecting seat, the rack is connected to the gear transmission arranged on the rotating rod, and the fixing buckle is used to lock or release the rotating rod.

[0017] As a further optimization scheme of the present invention, the second connecting part includes a second adapter connected to the base, the second adapter is locked with the base through a spring pin, the loading platform is arranged on the top of the second adapter, and the top of the loading platform is used to load the sample to be tested.

[0018] As a further optimization scheme of the present invention, the syringe clamp includes an annular mounting seat, a lower fixing plate arranged on the inner bottom surface of the mounting seat, an upper fixing plate stacked on the lower fixing plate, and an annular screw cover located above the upper fixing plate and screwed to the mounting seat, the upper fixing plate and the lower fixing plate are both provided with through holes adapted to the syringe, the upper fixing plate and the lower fixing plate are used to clamp the syringe flange, and the screw cover is provided with bolts for pressing down and tightening the upper fixing plate.

[0019] As a further optimization scheme of the present invention, the detection component includes a load sensor, a displacement sensor and a computer. The load sensor is arranged on the driving end to detect the driving load of the driving mechanism; the displacement sensor is arranged on the base to detect the displacement of the upper clamp.

[0020] The present invention also provides a method for testing mechanical properties during slurry injection, using the resistance testing system during slurry injection for testing, the testing method comprising:

[0021] Step 1: Assemble the stress loading part and assemble the test fixture according to the different specifications of the syringe, fix the upper fixture to the driving end of the driving mechanism, and fix the lower fixture to the base;

[0022] Step 2: Rotate the lower fixture to adjust the upper fixture and the lower fixture to a parallel position, fix the syringe fixture with the syringe in the first pit with a pressing plate, and then rotate the lower fixture to make the upper fixture and the lower fixture perpendicular. After completing the fixture debugging, start the syringe puncture test;

[0023] Step 3: Place the sample into the loading platform and place the sample directly under the needle tip of the syringe. Start the driving mechanism to drive the upper fixture and the syringe fixture to descend synchronously, so that the needle tip of the syringe pierces the sample. The load sensor monitors the force value during the puncture process in real time.

[0024] Step 4: After the acupuncture process is completed, the computer software is set to pause the test, the pressing plate is removed from the upper surface of the syringe clamp, and the height position of the second clamping assembly is adjusted so that the syringe clamp is located in the second pit. After adjusting the clamp, the injection performance test is started again;

[0025] Step 5: Start the driving mechanism to drive the pressure rod of the upper fixture to descend, directly acting on the syringe push rod, driving the syringe push rod to squeeze out the slurry inside the syringe, inject it into the sample, and connect the computer through the load sensor to monitor the extrusion force value required during the injection process in real time.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] The present invention can monitor the change of mechanical properties of the sample during the slurry injection process in real time; the present invention can monitor the change of force when the syringe passes through different layers during the puncture of the carbon fiber preform in real time; the present invention can monitor the change of force during the slurry injection process under different loading loads in real time; through the reasonable selection and optimization of test parameters of devices such as material mechanical property testing machines and injection fixtures, the present invention can realize the effective evaluation of mechanical properties during puncture and slurry injection processes under conditions close to the actual load; based on high-precision load sensors and displacement sensors, the present invention has high test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the stress loading part of the present invention;

[0029] Figure 2 The structure of the test fixture of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 3 The structure of the test fixture of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 4 It is a front structural schematic diagram of the syringe clamp of the present invention;

[0032] Figure 5 It is a schematic diagram of the exploded structure of the syringe clamp of the present invention;

[0033] Figure 6 is a graph showing the change in mechanical properties during puncture at different cracked carbon coating thicknesses; Figure 6a in the figure is a curve diagram of the change of mechanical properties during the puncture process without coating; Figure 6 b is a curve diagram of the change of mechanical properties during the puncture process under a 0.2 μm thick coating; Figure 6 c in the figure is a curve diagram of the change of mechanical properties during the puncture process in the case of a 0.4 μm thick coating;

[0034] Figure 7 is a graph showing the changes in ceramic slurry injection under different forces; Figure 7 a in the figure is a curve diagram of the change of ceramic slurry injection under a load of 100N; Figure 7 b is a curve diagram of the ceramic slurry injection change under a load of 150N; Figure 7 Figure c is a curve diagram of the ceramic slurry injection changes under a load of 200N.

[0035] Figure numerals: 1, stress loading part; 11, base; 12, frame; 13, driving mechanism; 14, load sensor; 15, displacement sensor; 16, computer; 2, test fixture; 21, upper fixture; 210, first connecting part; 211, first clamping assembly; 2101, connecting plate; 2102, pressure rod; 2103, first adapter; 2104, first side plate; 2105, first mounting hole; 2106, first extension plate; 2107, first pit; 2108, pressure plate; 22, lower fixture; 220, second connecting part; 221, loading platform Table; 222, second clamping assembly; 2201, lifting plate; 2202, second side plate; 2203, second extension plate; 2204, second pit; 2205, cover plate; 2206, second mounting hole; 2207, connecting seat; 2208, rack; 2209, rotating rod; 2210, second adapter; 23, syringe clamp; 230, mounting seat; 231, lower fixing plate; 232, upper fixing plate; 233, screw cap; 234, bolt; 3, syringe; 31, syringe housing; 32, syringe flange; 33, syringe push rod; 4, sample to be tested. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0037] This embodiment provides a resistance testing system during slurry injection, which can evaluate the mechanical properties of slurry during carbon fiber preform injection and monitor the force changes during injection in real time. The system includes a stress loading part and a test fixture.

[0038] like Figure 1 As shown, the stress loading part 1 includes a base 11, a frame 12, a driving mechanism 13, and a detection component.

[0039] Among them, the base 11 is used to support the entire test system to ensure the stability and safety of the system. The frame 12 is fixed on the base 11 to support the driving mechanism 13 and other related components. The driving mechanism 13 is installed on the top of the frame 12 to provide vertical power to drive the upper fixture 21 to move up and down. The driving mechanism 13 can be in the form of electric or hydraulic, and its specific structure can be selected by conventional methods in this field. The detection component includes a load sensor 14, a displacement sensor 15 and a computer 16. The load sensor 14 is arranged on the driving end to detect the driving load of the driving mechanism 13; the displacement sensor 15 is arranged on the base 11 to detect the displacement of the upper fixture 21; the computer 16 is used to receive data from the load sensor 14 and the displacement sensor 15, and process and display them. The detection component ensures that the changes in mechanical properties during the injection process can be monitored in real time, and improves the precision and accuracy of the test.

[0040] The test fixture 2 includes an upper fixture 21 connected to the driving end of the driving mechanism 13 , a lower fixture 22 seated on the base 11 , and a syringe fixture 23 for clamping the syringe housing 31 .

[0041] like Figure 2 and Figure 3 As shown, the upper clamp 21 includes a first connecting portion 210 and a first clamping assembly 211 .

[0042] The first connecting portion 210 includes a connecting plate 2101 and a pressure rod 2102, and the top of the pressure rod 2102 is connected to the driving end via a first adapter 2103. The first clamping assembly 211 includes two first side plates 2104 arranged opposite to each other at both ends of the connecting plate 2101, and the tops of the two first side plates 2104 are provided with a plurality of first mounting holes 2105 for fixing the connecting plate 2101 at intervals along the height direction, and the bottoms of the two first side plates 2104 are used to clamp the syringe clamp 23. Specifically, the bottom of the two first side plates 2104 extend inward in a direction perpendicular to the first side plates 2104 to form a first extension plate 2106, and there is a gap between the two first extension plates 2106. The two first extension plates 2106 are each provided with a first recess 2107 for placing the syringe clamp 23 at the gap, and the top surfaces of the two first extension plates 2106 are provided with a pressing plate 2108 for pressing down and fixing the syringe clamp 23, one end of the pressing plate 2108 is fixed on the top surface of the first extension plate 2106, and the other end extends to above the syringe clamp 23.

[0043] It can be seen from the above structural design that by defining the specific structure of the first connecting part 210, including the connecting plate 2101 and the pressing rod 2102, the stable connection between the upper clamp 21 and the driving mechanism 13 is ensured, and at the same time, the position of the first clamping assembly 211 can be adjusted up and down through the design of multiple first mounting holes 2105, which enhances the adaptability and flexibility of the system and can be suitable for syringes 3 of different specifications of 1-150ml. The first pit 2107 can be set as an arc-shaped pit, which can limit the syringe clamp 23 in the horizontal direction, and the pressing plate 2108 and the first pit 2107 can limit the syringe clamp 23 in the height direction. By setting the first extension plate 2106, the first pit 2107 and the pressing plate 2108 at the bottom of the first side plate 2104, it is ensured that the syringe clamp 23 can be stably clamped and fixed, preventing loosening or deviation during the injection process, and improving the accuracy and reliability of the test.

[0044] like Figure 2 and Figure 3 As shown, the lower fixture 22 includes a second connecting portion 220 , a loading platform 221 , and a second clamping assembly 222 .

[0045] The second connection part 220 includes a second adapter 2210 connected to the base 11, the second adapter 2210 is locked with the base 11 through a spring pin, and the loading platform 221 is arranged on the top of the second adapter 2210, and the top of the loading platform 221 is used to load the sample 4 to be tested. The second clamping assembly 222 includes a lifting plate 2201 installed on both sides of the loading platform 221 through a lifting assembly, and the two lifting plates 2201 are fixed with second side plates 2202, and the tops of the two second side plates 2202 are extended inwardly along a direction perpendicular to the second side plates 2202 to form a second extension plate 2203, and there is a gap between the two second extension plates 2203. The tops of the two second extension plates 2203 are provided with a cover plate 2205, and a plurality of second mounting holes 2206 are spaced apart in the horizontal direction on the cover plate 2205, and the two cover plates 2205 are provided with a second pit 2204 for placing the syringe clamp 23 at the gap. The lifting assembly includes a connecting seat 2207 arranged on the side wall of the loading platform 221, a rack 2208 arranged on the inner wall of the lifting plate 2201, a rotating rod 2209 arranged on the connecting seat 2207, and a fixing buckle. The lifting plate 2201 is limitedly connected with the connecting seat 2207, and the rack 2208 is connected with the gear transmission arranged on the rotating rod 2209. The rack 2208 can be moved up and down by rotating the rotating rod 2209; the fixing buckle is used to lock or release the rotating rod 2209, and the specific structure of the fixing buckle can be selected conventionally in the field.

[0046] As can be seen from the above structural design, the structure of the second clamping assembly 222 is defined, including the lifting plate 2201 and the second side plate 2202 installed on both sides of the loading platform 221 through the lifting assembly, ensuring that the lower clamp 22 can adapt to syringes 3 of different specifications of 1-150ml. At the same time, through the design of the cover plate 2205 and multiple second mounting holes 2206, the position of the cover plate 2205 can be adjusted left and right, enhancing the adaptability and flexibility of the system. By specifically describing the structure of the lifting assembly, including the connecting seat 2207, the rack 2208, the rotating rod 2209 and the fixed buckle, the height of the second clamping assembly 222 is adjustable, so that it can adapt to syringes 3 of different sizes, enhancing the adaptability and flexibility of the system. The specific structure of the second connecting part 220 is defined, including the second adapter 2210 connected to the base 11 and the loading platform 221, ensuring the stable connection between the lower clamp 22 and the base 11, and at the same time locked by the spring pin, it can be pulled out to rotate the angle 0-360°, ensuring the stability and safety of the system.

[0047] like Figure 4 and Figure 5As shown, the syringe clamp 23 includes an annular mounting seat 230, a lower fixing plate 231 arranged on the inner bottom surface of the mounting seat 230, an upper fixing plate 232 stacked on the lower fixing plate 231, and an annular screw cover 233 located above the upper fixing plate 232 and screwed to the mounting seat 230. The upper fixing plate 232 and the lower fixing plate 231 are both provided with through holes adapted to the syringe 3, and the upper fixing plate 232 and the lower fixing plate 231 are used to clamp the syringe flange 32, and the screw cover 233 is provided with a bolt 234 for pressing down and tightening the upper fixing plate 232.

[0048] It can be seen from the above structural design that by defining the specific structure of the syringe clamp 23, including the annular mounting seat 230, the lower fixing plate 231, the upper fixing plate 232 and the annular screw cap 233, it is ensured that the syringe 3 can be firmly fixed to prevent loosening or tilting during the injection process, thereby improving the accuracy and reliability of the test.

[0049] Based on the above structural design, the present invention also provides a method for testing mechanical properties during slurry injection, comprising the following steps:

[0050] Step 1: Assemble the stress loading part 1 and assemble the test fixture 2 according to the different specifications of the syringe 3

[0051] The upper clamp 21 is fixed to the driving end of the driving mechanism 13 , and the lower clamp 22 is fixed to the base 11 .

[0052] Step 2: Adjust the positions of the upper clamp 21 and the lower clamp 22

[0053] Rotate the lower clamp 22 to adjust the upper clamp 21 and the lower clamp 22 to a parallel position (see Figure 2 ), the syringe fixture 23 with the syringe 3 is fixed in the first pit 2107 by the pressing plate 2108, and then the lower fixture 22 is rotated so that the upper fixture 21 is perpendicular to the lower fixture 22 (see Figure 3 ), after completing the fixture debugging, start the puncture test of the syringe 3.

[0054] Step 3: Perform a puncture test

[0055] The sample is placed in the loading platform 221 and positioned directly below the needle tip of the syringe 3. The driving mechanism 13 is started to drive the upper clamp 21 and the syringe clamp 23 to descend synchronously, so that the needle tip of the syringe 3 pierces the sample. The load sensor 14 monitors the force value during the acupuncture process in real time.

[0056] Step 4: Perform injection performance test

[0057] After the acupuncture process is completed, the computer 16 software is set to pause the test, and the pressure plate 2108 is removed from the upper surface of the syringe clamp 23. By adjusting the height position of the second clamping assembly 222, the syringe clamp 23 is placed in the second pit 2204. After adjusting the clamp, the injection performance test is started again.

[0058] Step 5: Force Monitoring During Injection

[0059] The driving mechanism 13 is started to drive the pressure rod 2102 of the upper clamp 21 to descend, directly acting on the syringe push rod 33, driving the syringe push rod 33 to squeeze out the slurry in the syringe 3 and inject it into the sample. The load sensor 14 is connected to the computer 16 to monitor the extrusion force required during the injection process in real time. After the test, the positions of the upper and lower clamps 22 are as shown in FIG. Figure 3 shown.

[0060] In combination with the above-mentioned test system and test method, the changes in mechanical properties during the puncture process under different cracked carbon coating thicknesses and the changes in ceramic slurry injection under different force loadings are tested and described below.

[0061] 1. Changes in mechanical properties during puncture at different cracked carbon coating thicknesses

[0062] A carbon fiber preform consisting of a 0 / 90° non-wefted cloth layer and a mesh layer was used as a test sample. A cracked carbon coating was deposited on the carbon fiber preform by chemical vapor deposition. The thicknesses of the cracked carbon coating were 0, 0.2 μm and 0.4 μm, respectively.

[0063] The sample is placed in the loading platform 221 and positioned directly below the needle tip of the syringe 3. The driving mechanism 13 is started to drive the upper clamp 21 and the syringe clamp 23 to descend synchronously, so that the needle tip of the syringe 3 pierces the sample. The load sensor 14 monitors the force value during the puncture process in real time. The results are as follows: Figure 6 As shown in a, b and c.

[0064] 2. Changes in ceramic slurry injection under different force loading

[0065] A carbon fiber preform consisting of a 0 / 90° non-wefted cloth layer and a mesh tire layer was used as a test sample. Zirconium diboride-phenolic resin slurry was used to perform an injection test on the carbon fiber preform. The loading loads were 100N, 150N and 200N respectively.

[0066] Place the sample into the loading platform 221, and position the sample directly below the needle tip of the syringe 3. Start the drive mechanism 13 to drive the upper clamp 21 and the syringe clamp 23 to descend synchronously, so that the needle tip of the syringe 3 penetrates into the sample. When the needle penetrates to the corresponding range, set the computer 16 software to pause the test, remove the pressure plate 2108 from the upper surface of the syringe clamp 23, and adjust the height position of the second clamping assembly 222 so that the syringe clamp 23 is located in the second pit 2204. After adjusting the clamp, start the test again to perform the injection performance test. Start the drive mechanism 13 to drive the pressure rod 2102 of the upper clamp 21 to descend, directly acting on the syringe push rod 33, driving the syringe push rod 33 to squeeze out the slurry inside the syringe 3 and inject it into the sample. The load sensor 14 is connected to the computer 16 to monitor the extrusion force required during the injection process in real time. The results are as follows: Figure 7 As shown in a, b and c.

[0067] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the resistance testing system and testing method during slurry injection of the present invention, and can produce the positive effects described in the present invention.

[0068] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0069] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A resistance test system during slurry injection, the test system comprising a stress loading part (1) and a test fixture (2), the stress loading part (1) comprising a base (11), a frame (12) arranged on the base (11), a driving mechanism (13) arranged on the top of the frame (12), and a detection component for detecting a driving load of the driving mechanism (13) and detecting a displacement of the test fixture (2), Features: The test fixture (2) comprises an upper fixture (21) connected to the driving end of the driving mechanism (13), a lower fixture (22) located on the base (11), and a syringe fixture (23) for clamping a syringe housing (31); the upper fixture (21) comprises a first connecting portion (210) connected to the driving end and a first clamping component (211) for clamping the syringe fixture (23); the position of the first clamping component (211) relative to the first connecting portion (210) is adjustable up and down, The upper clamp (21) can be driven by the driving mechanism (13) to rise and fall in the height direction; the lower clamp (22) includes a second connecting portion (220) connected to the base (11), a loading platform (221) for loading the sample (4) to be tested, and a second clamping component (222) for clamping the syringe clamp (23); the position of the second clamping component (222) relative to the loading platform (221) is adjustable up and down, and the rotation angle of the lower clamp (22) relative to the base (11) is adjustable.

2. The resistance testing system during slurry injection according to claim 1, Features: The first connecting part (210) includes a connecting plate (2101) and a pressure rod (2102) passing through the connecting plate (2101), and the top of the pressure rod (2102) is connected to the driving end via a first adapter (2103); the first clamping assembly (211) includes two first side plates (2104) arranged opposite to each other at both ends of the connecting plate (2101), and the tops of the two first side plates (2104) are provided with a plurality of first mounting holes (2105) for fixing the connecting plate (2101) at intervals along the height direction, and the bottoms of the two first side plates (2104) are used to clamp the syringe clamp (23).

3. The resistance testing system during slurry injection according to claim 2, Features: The bottoms of the two first side plates (2104) are extended inward in a direction perpendicular to the first side plates (2104) to form a first extension plate (2106), and there is a gap between the two first extension plates (2106). The two first extension plates (2106) are provided with a first recess (2107) for placing the syringe clamp (23) at the gap, and the top surfaces of the two first extension plates (2106) are provided with a pressing plate (2108) for pressing down and fixing the syringe clamp (23).

4. The resistance testing system during slurry injection according to claim 1, Features: The second clamping assembly (222) includes a lifting plate (2201) installed on both sides of the loading platform (221) through a lifting assembly, and a second side plate (2202) is fixed on the two lifting plates (2201). The tops of the two second side plates (2202) extend inward in a direction perpendicular to the second side plates (2202) to form a second extension plate (2203). There is a gap between the two second extension plates (2203), and the tops of the two second extension plates (2203) are provided with a cover plate (2205), and the two cover plates (2205) are provided with a second pit (2204) at the gap for placing the syringe clamp (23).

5. The resistance testing system during slurry injection according to claim 4, Features: The cover plate (2205) is provided with a plurality of second mounting holes (2206) spaced apart in a horizontal direction.

6. The resistance testing system during slurry injection according to claim 4, Features: The lifting assembly comprises a connecting seat (2207) arranged on the side wall of the loading platform (221), a rack (2208) arranged on the inner wall of the lifting plate (2201), a rotating rod (2209) arranged on the connecting seat (2207) and a fixing buckle; the lifting plate (2201) is limitedly connected to the connecting seat (2207); the rack (2208) is transmission-connected to a gear sleeved on the rotating rod (2209); and the fixing buckle is used to lock or release the rotating rod (2209).

7. The resistance testing system during slurry injection according to claim 1 or 4, Features: The second connecting part (220) includes a second adapter (2210) connected to the base (11), the second adapter (2210) is locked with the base (11) via a spring pin, the loading platform (221) is arranged on the top of the second adapter (2210), and the top of the loading platform (221) is used for loading the sample (4) to be tested.

8. The resistance testing system during slurry injection according to claim 1, Features: The syringe clamp (23) comprises an annular mounting seat (230), a lower fixing plate (231) arranged on the inner bottom surface of the mounting seat (230), an upper fixing plate (232) stacked on the lower fixing plate (231), and an annular rotary cover (233) located above the upper fixing plate (232) and screwed to the mounting seat (230), wherein the upper fixing plate (232) and the lower fixing plate (231) are both provided with through holes adapted to the syringe (3), the upper fixing plate (232) and the lower fixing plate (231) are used to clamp the syringe flange (32), and the rotary cover (233) is provided with a bolt (234) for pressing down and tightening the upper fixing plate (232).

9. The resistance testing system during slurry injection according to claim 1, Features: The detection component comprises a load sensor (14), a displacement sensor (15) and a computer (16); the load sensor (14) is arranged on the driving end and is used to detect the driving load of the driving mechanism (13); the displacement sensor (15) is arranged on the base (11) and is used to detect the displacement of the upper clamp (21).

10. A method for testing mechanical properties during slurry injection. It is characterized in that The test is performed using the resistance test system during slurry injection according to any one of claims 1 to 9, wherein the test method comprises: Step 1: Assemble the stress loading part (1), and assemble the test fixture (2) according to the different specifications of the syringe (3), fix the upper fixture (21) to the driving end of the driving mechanism (13), and fix the lower fixture (22) to the base (11); Step 2: Rotate the lower fixture (22) to adjust the upper fixture (21) and the lower fixture (22) to a parallel position, fix the syringe fixture (23) equipped with the syringe (3) in the first pit (2107) using the pressing plate (2108), and then rotate the lower fixture (22) to make the upper fixture (21) and the lower fixture (22) perpendicular. After completing the fixture debugging, start the puncture test of the syringe (3); Step 3: Place the sample into the loading platform (221) and place the sample directly below the needle tip of the syringe (3). Start the driving mechanism (13) to drive the upper clamp (21) and the syringe clamp (23) to descend synchronously, so that the needle tip of the syringe (3) pierces the sample. The load sensor (14) monitors the force value during the piercing process in real time. Step 4: After the acupuncture process is completed, the computer (16) software is set to pause the test, and the pressure plate (2108) is removed from the upper surface of the syringe clamp (23). The height position of the second clamping assembly (222) is adjusted so that the syringe clamp (23) is seated in the second recess (2204). After adjusting the clamp, the test is started again to perform the injection performance test; Step 5: Start the driving mechanism (13) to drive the pressure rod (2102) of the upper clamp (21) to descend, directly acting on the syringe push rod (33), driving the syringe push rod (33) to squeeze out the slurry inside the syringe (3), and inject it into the sample, and connect the computer (16) through the load sensor (14) to monitor the extrusion force value required during the injection process in real time.

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