Silicon carbide fiber wear resistance testing device

Abstract

The silicon carbide fiber wear resistance testing device comprises an unwinding mechanism, grinding roller sets, a guide ring set and a winding mechanism, the grinding roller sets comprise the first grinding roller set and the second grinding roller set, the first grinding roller set is arranged between the unwinding mechanism and the guide ring set, and the second grinding roller set is arranged between the guide ring set and the winding mechanism; the guide ring set comprises a first-stage guide ring, a second-stage guide ring, a third-stage guide ring, a fourth-stage guide ring and a tension adjusting mechanism, the first-stage guide ring and the second-stage guide ring are obliquely arranged to form a guide-in ring set, the fourth-stage guide ring and the third-stage guide ring are obliquely arranged to form a guide-out ring set, and the guide-in ring set and the guide-out ring set are arranged in a front-back staggered mode in the vertical plane direction. The tension adjusting mechanism is arranged between the leading-in ring set and the leading-out ring set. Compared with the prior art, through the special friction pair design of the grinding roller and the guide ring group, the tension grading control and the multi-section friction path simulation, the test cost is reduced, the detection efficiency is improved, and the real friction scene of the silicon carbide fiber weaving process is comprehensively adapted.

Description

A silicon carbide fiber abrasion resistance testing device Technical Field

[0001] This invention relates to the field of ceramic fiber weaving testing technology, and in particular to a silicon carbide fiber abrasion resistance testing device. Background Technology

[0002] Continuous silicon carbide fiber (SiCF), as a high-performance ceramic fiber, is widely used as a reinforcement in hot-end composite materials in aerospace, nuclear energy, and other fields due to its high temperature resistance, high modulus, and oxidation resistance. However, during the weaving and braiding processes, repeated friction between the fiber and the reed, yarn guides, and between the fibers themselves can lead to monofilament breakage, fuzzing, and splitting, severely reducing the fiber's mechanical properties and fabric quality.

[0003] With the continuous expansion of the application scale of domestically produced silicon carbide fibers, scientifically and quantitatively characterizing and testing the abrasion resistance of silicon carbide fiber bundles can analyze the applicability of silicon carbide fibers to subsequent weaving, winding, and other processing technologies. This provides a scientific basis and guidance for the research, improvement, stable production, and material selection by downstream users of silicon carbide fibers. By testing the abrasion resistance of fiber bundles, the applicability of silicon carbide fibers to weaving processes can be analyzed, providing a scientific basis and guidance for material selection by downstream users of silicon carbide fibers.

[0004] Currently, there are no relevant tests for the abrasion resistance of high-performance fibers, either domestically or internationally. Researchers usually refer to textile industry standards (such as FZ / T50025-2014 and FZ / T 50063-2023) for abrasion resistance testing, but these standards have significant limitations:

[0005] 1. Mismatch in testing principles: Textile standards are mostly designed for organic fibers, using uniform linear friction or low-angle wrap friction (such as 110°), while silicon carbide fibers need to withstand multi-directional friction and complex bending stress in three-dimensional weaving;

[0006] 2. Poor parameter adaptability: The elastic modulus of silicon carbide fiber (≥350 GPa) is much higher than that of organic fiber (≤100 GPa). The high modulus results in high fiber bending stiffness. The friction speed set by the existing standard is prone to brittle fracture, which cannot simulate the low speed and high tension working conditions in actual weaving.

[0007] 3. Mismatch in the roughness of the friction pair: The Mohs hardness of silicon carbide fiber reaches 9~9.5. Traditional grinding rollers (sandpaper or ordinary metal) have insufficient hardness, resulting in distorted wear rate. Furthermore, there are no specifications for dedicated friction pairs such as hard chrome-plated grinding rollers (HV≥900) and ceramic guide rings (roughness≤0.4μm).

[0008] 4. Efficiency and Accuracy Deficiencies: Testing ultra-high molecular weight polyethylene fibers requires nearly 1000 minutes per test, while silicon carbide fibers, due to their high hardness, require even more frequent testing. Existing methods are too time-consuming and produce large data dispersion. Therefore, there is an urgent need to develop a dedicated testing method that can simulate the real-world processing friction scenarios of silicon carbide fibers and quantify their wear resistance.

[0009] In view of this, the inventor of this case conducted in-depth research, which led to the creation of this case. Summary of the Invention

[0010] The purpose of this invention is to provide a silicon carbide fiber abrasion resistance testing device that is suitable for abrasion resistance testing standards and specifications for silicon carbide fibers, thereby improving the accuracy of silicon carbide fiber abrasion resistance performance evaluation and product selection.

[0011] To achieve the above objectives, the technical solution of the present invention is as follows:

[0012] A silicon carbide fiber abrasion resistance testing device includes an unwinding mechanism, a friction pair, and a winding mechanism. The friction pair includes a grinding roller group and a guide ring group. The grinding roller group includes a first grinding roller group and a second grinding roller group. The first grinding roller group is disposed between the unwinding mechanism and the input end of the guide ring group, and the second grinding roller group is disposed between the output end of the guide ring group and the winding mechanism.

[0013] The guide ring group includes a first-level guide ring, a second-level guide ring, a third-level guide ring, a fourth-level guide ring, and a tension adjustment mechanism. The first-level guide ring and the second-level guide ring are obliquely arranged to form an inlet ring group. The third-level guide ring and the fourth-level guide ring are obliquely arranged to form an outlet ring group. The inlet ring group and the outlet ring group are staggered in the vertical direction.

[0014] The tension adjustment mechanism is located between the inlet ring group and the outlet ring group.

[0015] Furthermore, the misalignment distance between the first-level guide ring and the fourth-level guide ring is 10mm~20mm, and the misalignment distance between the third-level guide ring and the second-level guide ring is 10mm~20mm.

[0016] Furthermore, the distance between the first-stage guide ring and the fourth-stage guide ring is 40mm~60mm, and the distance between the third-stage guide ring and the second-stage guide ring is 40mm~60mm;

[0017] The distance between the first-stage guide ring and the second-stage guide ring is 120mm~140mm, and the distance between the third-stage guide ring and the fourth-stage guide ring is 120mm~140mm.

[0018] Furthermore, the guide ring group is disposed below the grinding roller group. The first grinding roller group includes a first grinding roller and a second grinding roller, and the second grinding roller group includes a third grinding roller and a fourth grinding roller. The unwinding mechanism, the first grinding roller, the second grinding roller and the guide ring group are arranged in sequence. The guide ring group, the third grinding roller and the fourth grinding roller are arranged in sequence between each other, and the grinding rollers form an interlaced friction trajectory.

[0019] Furthermore, the roughness of each grinding roller in the grinding roller assembly is 0.7~0.9 μm, and the hardness is greater than HV900.

[0020] Furthermore, the surface layer of each grinding roller in the grinding roller assembly is a hard chrome plated layer.

[0021] Furthermore, the tension adjustment mechanism includes a tension guide wheel and a counterweight, the counterweight being detachably mounted on the tension guide wheel.

[0022] Furthermore, the first-stage guide ring, the second-stage guide ring, the third-stage guide ring, the fourth-stage guide ring, and the tension guide wheel are all U-shaped ceramic guide wheels, and the U-shaped ceramic guide wheel is provided with a U-shaped groove for the fiber to pass through.

[0023] Furthermore, each set of the grinding rollers is provided with multiple sets of guide rings, and the number of guide ring sets is at least two.

[0024] Furthermore, the testing device is also equipped with a video recorder and a timer.

[0025] By adopting the above technical solution, the silicon carbide fiber abrasion resistance testing device of the present invention has the following beneficial effects: a dedicated friction pair design, and a combination design of grinding rollers and guide rings, accurately simulating the friction scenario of silicon carbide fiber processing. A tension adjustment mechanism allows for graded adjustment (weighting) according to fiber specifications, ensuring that the testing conditions are consistent with the actual process. The setting of multiple friction simulation stages reduces testing costs, improves detection efficiency, and fully adapts to the real friction scenario of silicon carbide fiber weaving processes. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the test device of the present invention (front view).

[0027] Figure 2 is a left-side view of the four guide rings of the present invention;

[0028] Figure 3 is a schematic diagram of the guide ring assembly of the present invention.

[0029] In the picture:

[0030] Unwinding mechanism 1; guide ring group 2; first-stage guide ring 21; second-stage guide ring 22; third-stage guide ring 23; fourth-stage guide ring 24; tension guide wheel 25; counterweight block 26; first grinding roller 3; second grinding roller 4; third grinding roller 5; fourth grinding roller 6; winding mechanism 7. Detailed Implementation

[0031] This utility model discloses a silicon carbide fiber abrasion resistance testing device, as shown in Figures 1 to 3. It includes an unwinding mechanism 1, a friction pair, and a winding mechanism 7. The friction pair includes a grinding roller group and a guide ring group 2. The grinding roller group includes a first grinding roller group and a second grinding roller group. The first grinding roller group is disposed between the unwinding mechanism 1 and the input end of the guide ring group, and the second grinding roller group is disposed between the output end of the guide ring group and the winding mechanism 7, forming multiple friction paths in an alternating manner.

[0032] The guide ring assembly includes a first-level guide ring 21, a second-level guide ring 22, a third-level guide ring 23, a fourth-level guide ring 24, and a tension adjustment mechanism. The first-level guide ring 21 and the second-level guide ring 22 are obliquely arranged in the vertical direction to form an inlet ring assembly. The third-level guide ring 23 and the fourth-level guide ring 24 are obliquely arranged in the vertical direction to form an outlet ring assembly. The inlet ring assembly and the outlet ring assembly are staggered in the vertical direction. Specifically, taking the orientation shown in Figure 1 as a reference orientation, the first-level guide ring 21 is located in the upper left position, the second-level guide ring 22 is located in the lower right position, the third-level guide ring 23 is located in the lower left position, and the fourth-level guide ring 22 is located in the upper right position.

[0033] Thus, the fiber segments between the first-level guide ring 21 and the second-level guide ring 22, and between the third-level guide ring 23 and the fourth-level guide ring 24, form wrap angle friction (e.g., 150~170°). In fiber abrasion resistance testing, the fiber-to-fiber wrap angle refers to the center angle corresponding to the contact arc formed at the intersection point of two fibers when they come into contact and rub against each other. This angle is determined by the geometric path of the fiber cross-winding, the applied tension, and the friction trajectory, and is a core parameter for simulating fiber-to-fiber friction damage (such as splitting and fuzzing) during fiber weaving.

[0034] The tension adjustment mechanism is located between the inlet ring group and the outlet ring group.

[0035] This invention relates to a silicon carbide fiber abrasion resistance testing device. It features a dedicated friction pair, combining a grinding roller with a guide ring assembly to accurately simulate the friction scenarios encountered during silicon carbide fiber processing. A tension adjustment mechanism allows for graded adjustments according to fiber specifications, ensuring test conditions match actual processes. The device incorporates multiple friction simulation stages, reducing testing costs, improving detection efficiency, and fully adapting to the real friction scenarios of silicon carbide fiber weaving processes.

[0036] In one preferred embodiment, the misalignment distance between the first-stage guide ring 21 and the fourth-stage guide ring 24 is 10mm~20mm, and the misalignment distance between the second-stage guide ring 22 and the third-stage guide ring 23 is 10mm~20mm.

[0037] The distance between the first-stage guide ring 21 and the fourth-stage guide ring 24 is 40mm~60mm, and the distance between the third-stage guide ring 23 and the second-stage guide ring 22 is 40mm~60mm.

[0038] The distance between the first-stage guide ring 21 and the second-stage guide ring 22 is 120mm~140mm; the distance between the third-stage guide ring 23 and the fourth-stage guide ring 24 is 120mm~140mm;

[0039] Specifically, the first-stage guide ring 21 and the fourth-stage guide ring 24 are arranged horizontally.

[0040] The third-stage guide ring 23 is horizontally positioned with the second-stage guide ring 22.

[0041] Thus, the wrap angle formed by the intersecting fibers between the first-level guide ring 21 and the second-level guide ring 22 and the fibers between the third-level guide ring 23 and the fourth-level guide ring 24 is about 150~170°.

[0042] In a preferred embodiment, a guide ring assembly is disposed below the grinding roller assembly. The first grinding roller assembly includes a first grinding roller 3 and a second grinding roller 4, and the second grinding roller assembly includes a third grinding roller 5 and a fourth grinding roller 6. The unwinding mechanism 1, the first grinding roller 3, the second grinding roller 4, and the guide ring assembly 2 are arranged sequentially. The guide ring assembly 2, the third grinding roller 5, and the fourth grinding roller 6 are arranged sequentially between each other. The first grinding roller 3, the second grinding roller 4, the third grinding roller 5, and the fourth grinding roller 6 are arranged alternately along the same horizontal plane, forming staggered friction tracks between each grinding roller. In this way, the damage mechanism in three-dimensional weaving, in which multi-directional friction accounts for 80%, can be restored.

[0043] The roughness of the first grinding roller 3, the second grinding roller 4, the third grinding roller 5, and the fourth grinding roller 6 is 0.7~0.9µm, and the hardness is greater than HV900. This allows for a more accurate simulation of the friction scenarios involved in the processing of silicon carbide fibers.

[0044] Furthermore, the surface layer of each grinding roller in the grinding roller assembly is a hard chrome plated layer, that is, the roughness of the hard chrome plated layer is 0.7~0.9um.

[0045] In one preferred embodiment, the tension adjustment mechanism includes a tension guide wheel 25 and a counterweight 26, with the counterweight 26 detachably mounted on the tension guide wheel 25. This dynamic tension control, with weights graded according to fiber specifications (0.5K / 1K), ensures that the testing conditions are consistent with the actual process.

[0046] The first-stage guide ring 21, the second-stage guide ring 22, the third-stage guide ring 23, the fourth-stage guide ring 24, and the tension guide wheel 25 are all U-shaped ceramic guide wheels. The U-shaped ceramic guide wheel is provided with a U-shaped groove for the fiber to pass through. The roughness of the first-stage guide ring, the second-stage guide ring, the third-stage guide ring, and the fourth-stage guide ring is ≤0.4μm.

[0047] In one preferred embodiment, a set of grinding rollers is provided with multiple sets of guide rings 2, with at least two sets of guide rings 2. This enables multi-channel parallel testing with high efficiency.

[0048] The above embodiments and accompanying drawings are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A silicon carbide fiber abrasion resistance testing device, characterized in that: The system includes an unwinding mechanism, a friction pair, and a winding mechanism. The friction pair includes a grinding roller group and a guide ring group. The grinding roller group includes a first grinding roller group and a second grinding roller group. The first grinding roller group is disposed between the input end of the unwinding mechanism and the guide ring group, and the second grinding roller group is disposed between the output end of the guide ring group and the winding mechanism. The guide ring group includes a first-stage guide ring, a second-stage guide ring, a third-stage guide ring, a fourth-stage guide ring, and a tension adjusting mechanism. The first-stage guide ring and the second-stage guide ring are obliquely arranged to form an inlet ring group, and the third-stage guide ring and the fourth-stage guide ring are obliquely arranged to form an outlet ring group. The inlet ring group and the outlet ring group are staggered in the vertical direction. The tension adjusting mechanism is disposed between the inlet ring group and the outlet ring group.

2. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: The misalignment distance between the first-stage guide ring and the fourth-stage guide ring is 10mm~20mm, and the misalignment distance between the third-stage guide ring and the second-stage guide ring is 10mm~20mm.

3. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: The distance between the first-level guide ring and the fourth-level guide ring is 40mm~60mm, and the distance between the third-level guide ring and the second-level guide ring is 40mm~60mm; the distance between the first-level guide ring and the second-level guide ring is 120mm~140mm, and the distance between the third-level guide ring and the fourth-level guide ring is 120mm~140mm.

4. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: The guide ring group is disposed below the grinding roller group. The first grinding roller group includes a first grinding roller and a second grinding roller. The second grinding roller group includes a third grinding roller and a fourth grinding roller. The unwinding mechanism, the first grinding roller, the second grinding roller and the guide ring group are arranged in sequence. The guide ring group, the third grinding roller and the fourth grinding roller are arranged in sequence between each other, and the grinding rollers form an interlaced friction trajectory.

5. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: The roughness of each grinding roller in the grinding roller group is 0.7~0.9um, and the hardness is greater than HV900.

6. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: The surface layer of each grinding roller in the grinding roller assembly is a hard chrome plated layer.

7. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: The tension adjustment mechanism includes a tension guide wheel and a counterweight, wherein the counterweight is detachably mounted on the tension guide wheel.

8. The silicon carbide fiber abrasion resistance testing device as described in claim 7, characterized in that: The first-stage guide ring, the second-stage guide ring, the third-stage guide ring, the fourth-stage guide ring, and the tension guide wheel are all U-shaped ceramic guide wheels, and the U-shaped ceramic guide wheel is provided with a U-shaped groove for the fiber to pass through.

9. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: Each set of grinding rollers is provided with multiple sets of guide rings, and the number of guide ring sets is at least two.

10. The silicon carbide fiber abrasion resistance testing device as described in claim 1, characterized in that: The testing device is also equipped with a video recorder and a timer.

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