Nano-whisker toughened aluminum oxide ceramic rod

Abstract

The utility model discloses a nano whisker toughened alumina ceramic rod, which comprises a ceramic rod body with two through ends, the ceramic rod body is provided with a plurality of groups of through holes along the axial direction in a penetrating manner, the inner contour of each through hole is of a regular hexagon honeycomb arrangement structure, and the section of a support piece is I-shaped. A load reduction groove is formed in the outer wall of each set of supporting pieces in a penetrating mode, and the inner wall of each load reduction groove is in an inverted trapezoidal shape. By arranging the matching structure of the regular hexagonal honeycomb-shaped through holes and the I-shaped supporting pieces, the uniform distribution characteristic of the honeycomb-shaped through holes enables the thermal stress to be reasonably dispersed, and the multi-point contact design of the I-shaped cross sections of the supporting pieces and the inner wall of the ceramic rod body improves the load transmission efficiency, avoids the situation of overlarge local stress, and improves the service life of the ceramic rod. And meanwhile, the stress distribution path is further optimized through the inverted trapezoidal structures of the load reducing grooves, so that the roller bar can still keep good deformation resistance under the high-temperature working condition.

Description

TECHNICAL FIELD

[0001] The utility model relates to ceramic rod technical field especially relates to a kind of nanometer whisker toughened alumina ceramic rod. BACKGROUND

[0002] Ceramic roller rod is widely used in the hot working of ceramic material, glass material, and multiple ceramic roller rods are installed in the hot working furnace, which plays the role of rolling bearing, conveying ceramic material and glass material. The ceramic properties of the ceramic roller rod can maintain stable form at high temperature, and complete the conveying work.

[0003] The utility model discloses a kind of hollow ceramic roller rods, the device when using, by the wall of roller in uniform hollow slot, greatly increase the radial extension size of roller wall, increase the deformation resistance of roller, with the axial support of support piece, so that roller can stably keep linear form, but specific use scene, this device has certain drawbacks, for example: its straight slot hollow structure is prone to stress concentration point at slot edge, especially under high temperature working condition, the slot edge of right-angle design is prone to crack initiation source, significantly reduce the fatigue life of roller, secondly, the support piece of this design adopts cross insertion structure, there is obvious weak area in intersection part, under the action of long-term alternating load, fracture failure can occur, thus it needs to be proposed in view of the above problems A kind of nanometer whisker toughened alumina ceramic rod. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the shortcomings in the prior art, and provides a kind of nanometer whisker toughened alumina ceramic rod.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of nanometer whisker toughened alumina ceramic rod, including two ends through ceramic rod body, the ceramic rod body is along the axial direction and is passed and is equipped with multiple through holes, the inner contour of the through hole is arranged in the structure of regular hexagon honeycomb, the six-edge unit of the through hole is continuously distributed in dense packing, the support shaft is movably connected in the ceramic rod body, the support shaft outer wall is equidistantly provided with support piece, the support piece and support shaft section form hub, and are attached with the inside of ceramic rod body, the support piece section forms I-shaped, the outer wall of each group of support piece is passed and is equipped with load reduction groove, the inner wall of the load reduction groove is set as inverted trapezoidal.

[0007] Preferably, the support shaft and the support piece outer wall are provided with a shaft cylinder, the shaft cylinder is fixedly connected with a rotating shaft at one end away from the support shaft, and the rotating shaft is on the same axis as the support shaft, the shaft cylinder outer wall shape is consistent with the support piece and the support shaft section, and the support piece and the support shaft contact surface are attached with the shaft cylinder inner wall.

[0008] Preferably, the shaft cylinder outer wall is circumferentially distributed with multiple groups of assembly holes, each group of the assembly holes is provided with a rubber layer at the assembly hole notch, and each group of the assembly holes is rotationally connected with a screw, the screw is threadedly extended into the corresponding support, and one end is extended to the outside of the assembly hole.

[0009] Preferably, the screw is in contact with the outer wall of the rubber layer, a nut is threadedly connected on the threaded segment of the screw, and the nut is located at the opposite orifice of the rubber layer.

[0010] Preferably, the ceramic rod body is made of alumina material, and the alumina material is dispersed with nanowhiskers, the inner wall surface of the hexagonal unit of the through hole is provided with a rough interface layer interlocked with the nanowhiskers, and the web of the I-shaped cross section of the support is embedded with a nanowhisker reinforced belt, and the nanowhiskers in the reinforced belt are oriented arranged along the length direction of the support.

[0011] Preferably, the inner wall surface of the shaft cylinder in contact with the support is provided with a nanowhisker transition layer, and the nanowhiskers in the transition layer are arranged in a radial manner.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model discloses a cooperation structure of hexagonal honeycomb through hole and I-shaped support, the uniform distribution characteristics of the honeycomb through hole make the thermal stress be dispersed reasonably, and the multi-point contact design of the I-shaped cross section of the support and the inner wall of the ceramic rod body improves load transmission efficiency and avoids the situation that local stress is too large, simultaneously, the inverted trapezoidal structure of the load reduction groove further optimizes the stress distribution path, and the roller rod can still keep good deformation resistance under high temperature working condition.

[0014] 2. The utility model discloses a cooperation structure of hexagonal honeycomb through hole and I-shaped support, the uniform distribution characteristics of the honeycomb through hole make the thermal stress be dispersed reasonably, and the multi-point contact design of the I-shaped cross section of the support and the inner wall of the ceramic rod body improves load transmission efficiency and avoids the situation that local stress is too large, simultaneously, the inverted trapezoidal structure of the load reduction groove further optimizes the stress distribution path, and the roller rod can still keep good deformation resistance under high temperature working condition. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A structure diagram of the nanowhisker toughened alumina ceramic rod is provided for the utility model;

[0016] Figure 2 A Figure 1 Sectional view structure diagram.

[0017] Figure 3 A Figure 2 Structure diagram.

[0018] Figure 4For Figure 3 Structure diagram of the shaft cylinder and the rotating shaft.

[0019] Figure 5 For Figure 3 Structure diagram of the support shaft and the support.

[0020] In the figure: 1, ceramic rod body; 2, shaft cylinder; 3, assembly hole; 4, screw; 5, rotating shaft; 6, through hole; 7, support; 8, support shaft; 9, load reduction groove; 10, nut; 11, rubber layer. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0022] With reference to Figures 1-5 A nanometer whisker toughened alumina ceramic rod, comprising a ceramic rod body 1 penetrating through two ends, a plurality of groups of through holes 6 are opened through the ceramic rod body 1 in the axial direction, the inner contour of the through hole 6 is a regular hexagonal honeycomb arrangement structure, the hexagonal cells of the through hole 6 are continuously distributed in a close-packed manner, a support shaft 8 is movably connected in the ceramic rod body 1, support pieces 7 are equidistantly arranged on the outer wall of the support shaft 8, the support piece 7 and the support shaft 8 form a hub shape in cross section, and are attached to the inside of the ceramic rod body 1, the support piece 7 forms an I-shaped cross section, and load reduction grooves 9 are opened through the outer wall of each group of support pieces 7, and the inner wall of the load reduction groove 9 is arranged in an inverted trapezoidal shape;

[0023] Further, the through hole 6 of the regular hexagonal honeycomb arrangement structure extends in the axial direction of the ceramic rod body 1, forming a periodically distributed mechanical load bearing unit, and the web of the I-shaped support piece 7 forms a multi-point contact with the inner wall of the ceramic rod body 1, further optimizing the load transmission path and avoiding local stress concentration.

[0024] The shaft cylinder 2 is sleeved on the outer wall of the support shaft 8 and the support piece 7, one end of the shaft cylinder 2 away from the support shaft 8 is fixedly connected with the rotating shaft 5, and the rotating shaft 5 and the support shaft 8 are on the same axis, the shape of the outer wall of the shaft cylinder 2 is consistent with the cross section of the support piece 7 and the support shaft 8, and the contact surface of the support piece 7 and the support shaft 8 is attached to the inner wall of the shaft cylinder 2;

[0025] Further, the concentric connection structure of the shaft cylinder 2 and the rotating shaft 5 enables the ceramic rod body 1 to maintain dynamic balance when rotating, and at the same time, the attachment of the inner wall of the shaft cylinder 2 and the support piece 7 enhances the torsional stiffness of the overall structure.

[0026] The outer wall of the shaft cylinder 2 is circumferentially provided with a plurality of groups of assembly holes 3, each group of assembly holes 3 is provided with a rubber layer 11, each group of assembly holes 3 is rotationally connected with a screw 4, the screw 4 is screwed into the corresponding support 7, and one end of the screw 4 extends to the outside of the assembly hole 3, the screw 4 is in contact with the outer wall of the rubber layer 11, and the threaded segment of the screw 4 is screwed with a nut 10, and the nut 10 is located at the opposite hole of the rubber layer 11.

[0027] Further, the rubber layer 11 forms a flexible buffer interface, effectively absorbing the micro-vibration between the screw 4 and the shaft cylinder 2.

[0028] The ceramic rod body 1 is made of alumina material, and the alumina material is dispersed with nanowhiskers, the inner wall surface of the hexagonal unit of the through hole 6 is provided with a rough interface layer interlocked with the nanowhiskers, and the web of the H-shaped cross section of the support 7 is embedded with a nanowhisker reinforced belt, and the nanowhiskers in the reinforced belt are arranged in the length direction of the support 7.

[0029] Further, the interlocking structure of the rough interface layer and the nanowhiskers forms a mechanical interlocking between the inner wall of the through hole 6 and the ceramic matrix, inhibits the crack propagation along the hole edge, and the nanowhisker reinforced belt in the web of the H-shaped cross section extends in the length direction of the support 7, forming a continuous strengthening channel.

[0030] The inner wall surface of the shaft cylinder 2 in contact with the support 7 is provided with a nanowhisker transition layer, and the nanowhiskers in the transition layer are arranged in a radial manner.

[0031] Further, the radial arrangement direction of the nanowhisker transition layer matches the stress direction of the support 7, forming a gradient transition interface between the shaft cylinder 2 and the support 7, and enhancing the load transfer efficiency between the heterogeneous materials.

[0032] In the utility model, when the ceramic rod body 1 is applied to the high-temperature kiln transmission scene, the ceramic rod body 1 is installed on the kiln support through the two ends of the rotating shaft 5, when the kiln is started, the ceramic rod body 1 rotates with the rotating shaft 5, and the material is transmitted, at this time, the regular hexagonal honeycomb through hole 6 forms a uniform thermal stress dispersion network in the high-temperature environment, and the rough interface layer and the nanowhisker interlocking structure of the inner wall of the honeycomb unit effectively block the crack propagation along the hole wall. At the same time, the web of the H-shaped support 7 is in contact with the inner wall of the ceramic rod body 1, and the load of the material is transmitted to the support shaft 8 through multi-point contact, and the inverted trapezoidal structure of the load reduction groove 9 guides the stress to diffuse along the groove wall when under pressure, avoiding stress concentration at the root of the H-shaped cross section.

[0033] When the roller is subjected to a radial impact load, the nanowhisker transition layer of the inner wall of the shaft cylinder 2 and the radial whisker arrangement of the support 7 form a synergistic response, and the gradient transition interface between the heterogeneous materials converts the local impact force into uniformly distributed shear stress, and in the long-term high-temperature working condition, the nanowhisker reinforced zone inside the ceramic roller body 1 continuously provides axial reinforcement along the length direction of the support 7, and the periodic bearing unit of the honeycomb through hole 6 and the nanowhisker interlocking structure synergistically inhibit high-temperature creep deformation. When maintenance is required, the operator can loosen the screw cap 10 to release the fixation of the screw 4, and the plug-in structure of the shaft cylinder 2 and the support shaft 8 realizes quick disassembly and assembly.

[0034] The regular hexagonal honeycomb through hole 6 penetrates the ceramic roller body 1 in a close-packed arrangement, which greatly reduces the material usage while ensuring sufficient structural strength, and the web of the I-shaped support 7 is designed with a thin wall, and the load reduction groove 9 is provided on the outer wall of the support 7 to further reduce the weight.

[0035] In summary, the ceramic roller body 1 maintains lightweight while significantly improving the bending stiffness and thermal shock resistance in high-temperature environments, effectively solving the fracture failure problem of traditional ceramic rollers caused by stress concentration, and providing reliable protection for the long-period stable operation of the kiln equipment.

[0036] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A nanowhisker toughened alumina ceramic rod comprising a ceramic rod body (1) extending through both ends, characterised in that, The ceramic rod body (1) is provided with a plurality of groups of through holes (6) along the axial direction, the inner contour of the through holes (6) is arranged in a regular hexagonal honeycomb structure, the hexagonal cells of the through holes (6) are continuously distributed in a close-packed manner, a support shaft (8) is movably connected in the ceramic rod body (1), support pieces (7) are equidistantly arranged on the outer wall of the support shaft (8), the support pieces (7) and the support shaft (8) form a hub shape in cross section, and are attached to the inside of the ceramic rod body (1), the support pieces (7) form an I-shaped cross section, and load reduction grooves (9) are provided through the outer wall of each group of support pieces (7), and the inner wall of the load reduction grooves (9) is arranged in an inverted trapezoidal shape.

2. A nanowhisker toughened alumina ceramic rod according to claim 1, wherein The support shaft (8) and the support pieces (7) are provided with a shaft cylinder (2) on the outer wall, one end of the shaft cylinder (2) is fixedly connected with a rotating shaft (5) away from the support shaft (8), and the rotating shaft (5) and the support shaft (8) are on the same axis, the outer wall shape of the shaft cylinder (2) is consistent with the cross section of the support pieces (7) and the support shaft (8), and the contact surfaces of the support pieces (7) and the support shaft (8) are attached to the inner wall of the shaft cylinder (2).

3. A nanowhisker toughened alumina ceramic rod according to claim 2, wherein A plurality of groups of assembly holes (3) are circumferentially distributed on the outer wall of the shaft cylinder (2), each group of assembly holes (3) is provided through, and a rubber layer (11) is arranged at the slot of each assembly hole (3), each group of assembly holes (3) is rotatably connected with a screw (4), the screw (4) is screwed into the corresponding support piece (7), and one end extends to the outside of the assembly hole (3).

4. A nanowhisker toughened alumina ceramic rod according to claim 3, wherein The screw (4) is in contact with the outer wall of the rubber layer (11), a nut (10) is threadedly connected on the threaded segment of the screw (4), and the nut (10) is located at the opposite orifice of the rubber layer (11).

5. A nanowhisker toughened alumina ceramic rod according to claim 4, wherein the nanowhiskers are present in an amount of 0.1 to 10 vol%. The ceramic rod body (1) is made of alumina material, and the alumina material is dispersed with nanowhiskers, the inner wall surface of the hexagonal cell of the through hole (6) is provided with a rough interface layer interlocked with the nanowhiskers, the I-shaped cross section web of the support piece (7) is embedded with a nanowhisker reinforced belt, and the nanowhiskers in the reinforced belt are arranged in the length direction of the support piece (7).

6. A nanowhisker toughened alumina ceramic rod according to claim 5, wherein, The inner wall surface of the shaft cylinder (2) in contact with the support piece (7) is provided with a nanowhisker transition layer, and the nanowhiskers in the transition layer are arranged in a radial manner.

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