Device for preparing ceramic matrix composite through SLS-FDM compounding
Technical Field
The utility model relates to a processingequipment especially relates to a device that is used for the compound ceramic matrix composite of preparation of SLS-FDM.
Background
The ceramic matrix composite is a composite of a ceramic matrix and high-strength and high-elasticity fibers, and the fiber components are the same as or similar to those of the matrix, so that the expansion of cracks in the material is prevented, and the toughness of the ceramic is improved. The ceramic matrix composite has the characteristics of light weight, high temperature resistance, high strength and the like, and has obvious application in the field of aeroengines. The SiC/SiC ceramic matrix composite material consists of two parts: for the SiC/SiC ceramic matrix composite, the SiC fiber is a framework and bears main load, and the SiC matrix buffers and transmits the load to the SiC fiber, so that the SiC fiber is protected to a certain extent. Therefore, the performance of the SiC fibers is critical for SiC/SiC ceramic matrix composites.
Selective laser sintering, SLS for short, is a widely used rapid prototyping technique. During the forming process, the materials are stacked layer by layer, and the laser scans and sinters the materials among the stacked layers of each layer, so that new powder is bonded and grown with the forming substrate. The method is not limited by the complexity of the three-dimensional part, and the part can be manufactured without any tooling die. Fused deposition manufacturing, FDM for short, is an additive manufacturing technique in which a material is heated and melted in a nozzle while being extruded along a contour filling trajectory, the material rapidly solidifying and combining with the surrounding material.
However, the fiber components obtained by preparing the ceramic matrix composite material by adopting the selective laser sintering or fused deposition manufacturing method alone have the defects of small diameter, poor continuity, insufficient length, and limited tensile strength and rigidity at high temperature and high pressure.
The existing ceramic matrix composite processing equipment is generally only suitable for a selective laser sintering processing method or a fused deposition manufacturing processing method, and the composite preparation of the ceramic matrix composite by SLS-FDM cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device that is used for the compound ceramic matrix composite of preparation of SLS-FDM, it has overcome in the background art not enough of prior art.
The utility model provides a technical scheme that its technical problem adopted is:
an apparatus for preparing ceramic matrix composite material by SLS-FDM composite, comprising:
the laser scanning system comprises a master controller, a motor controller, a laser and a laser conduction device, wherein the motor controller, the laser and the laser conduction device are electrically connected with the master controller;
the working table is connected with the X-axis driving device to realize the back-and-forth movement of the working table in the X-axis direction, the FDM working head is connected with the Y-axis driving device and the Z-axis driving device to realize the back-and-forth movement of the FDM working head in the Y-axis direction and the Z-axis direction, and the powder paving device is connected with the powder paving driving device to realize the tiling and powder paving of the powder paving device on the working table surface; the X-axis, the Y-axis and the Z-axis are mutually vertical in pairs.
In one embodiment: the laser transmission device comprises a collimating lens, a focusing lens, a vibrating lens and an F-theta lens, wherein a laser beam emitted by the laser sequentially passes through the collimating lens, the focusing lens, the vibrating lens and the F-theta lens and then is focused on the workbench, and the laser beam is controlled to move on the workbench by controlling the deflection of the vibrating lens.
In one embodiment: the X-axis driving device comprises a first motor and a first screw rod, and the first screw rod is in threaded transmission connection with the workbench; the Y-axis driving device comprises a second motor and a second screw rod, and the second screw rod is in threaded transmission connection with the FDM working head; the Z-axis driving device comprises a third motor and a third screw rod, and the third screw rod is in transmission connection with the FDM working head; the powder spreading driving device comprises a fourth motor and a fourth screw rod, and the fourth screw rod is in threaded transmission connection with the powder spreading device; the motor controller is electrically connected with the first motor, the second motor, the third motor and the fourth motor.
In one embodiment: the powder paving device is arranged above the workbench and comprises a powder storage tank and a scraper for paving a ceramic-based powder layer.
In one embodiment: the lower part of the workbench is connected with a lifting platform for adjusting the lifting of the workbench.
Compared with the background technology, the technical scheme has the following advantages:
1. preparation ceramic matrix composite's device novel structure, simple, easy and simple to handle can be used for realizing the compound ceramic matrix composite of preparation of SLS-FDM.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic working diagram of an FMD working head according to this embodiment.
FIG. 2 is a schematic view of the overall structure of the apparatus for preparing the ceramic matrix composite material by SLS-FDM.
FIG. 3 is a schematic view of a part of the structure of the apparatus for preparing the ceramic matrix composite material by SLS-FDM composite according to this embodiment.
FIG. 4 is a second schematic view of a partial structure of the apparatus for preparing a ceramic matrix composite by SLS-FDM.
Detailed Description
Referring to fig. 1 to 4, an apparatus for preparing a ceramic matrix composite material by SLS-FDM includes:
the laser scanning system comprises a master controller 300, a motor controller 10, a laser 20 and a laser conduction device, wherein the motor controller 10, the laser 20 and the laser conduction device are electrically connected with the master controller 300, and laser beams emitted by the laser 20 are emitted in a two-dimensional scanning mode through the laser conduction device;
the working table 40 is connected with the X-axis driving device to realize the back-and-forth movement of the working table in the X-axis direction, the FDM working head 50 is connected with the Y-axis driving device and the Z-axis driving device to realize the back-and-forth movement of the FDM working head 50 in the Y-axis and Z-axis directions, and the trend of the X-axis of the working table and the trends of the Y-axis and Z-axis of the FDM working head are controlled to realize the formation of a three-dimensional trend of the working head FDM 50 relative to the working table 40. The powder paving device 60 is connected with a powder paving driving device to realize the back-and-forth paving of the powder paving device 60 on the surface of the workbench 40; the X-axis, the Y-axis and the Z-axis are mutually vertical in pairs. The FDM head 50 can be the head of an existing fused deposition fabrication apparatus. The FDM working head 50 is connected to a storage tank 400, and the storage tank 400 is used for supplying materials to the FDM working head 50.
The laser conduction device comprises a collimating mirror 71, a focusing mirror 72, a vibrating mirror 73 and an F-theta mirror 74, wherein a laser beam emitted by the laser 20 sequentially passes through the collimating mirror 71, the focusing mirror 72, the vibrating mirror 73 and the F-theta mirror 74 and then is focused on the workbench 40, and the two-dimensional movement of the laser beam on the workbench 40 is controlled by controlling the deflection of the vibrating mirror 73.
The X-axis driving device comprises a first motor 81 and a first screw rod 82, and the first screw rod 82 is in threaded transmission connection with the workbench 40; the Y-axis driving device comprises a second motor 91 and a second screw rod 92, and the second screw rod 92 is in threaded transmission connection with the FDM working head 50; the Z-axis driving device comprises a third motor 101 and a third screw rod 102, and the third screw rod 102 is in transmission connection with the FDM working head 50; the powder spreading driving device comprises a fourth motor 201 and a fourth screw rod 202, and the fourth screw rod 202 is in threaded transmission connection with the powder spreading device 60; the motor controller 10 is electrically connected to the first motor, the second motor, the third motor, and the fourth motor.
The powder spreading device 60 is arranged above the workbench 40 and comprises a powder storage tank 61 and a scraper 62 for spreading the ceramic-based powder layer.
Preferably, a lifting platform 30 is connected below the working platform 40 for adjusting the lifting of the working platform 40.
By combining the preparation device, the method for preparing the ceramic matrix composite material by SLS-FDM composite comprises the following steps:
step 1, a graph can be printed and a path can be planned through the master controller 300, wherein the planned path is a walking path of the FDM working head 50, and in the embodiment, the path is a Z-shaped path;
step 2, the FDM working head 50 extrudes the long fiber material and paves the long fiber material on the workbench in a planned path back and forth to a first planned processing surface;
step 3, uniformly paving ceramic matrix powder on the long fiber material of the current planned processing surface by the powder paving device 60;
step 4, sintering the extruded long fiber material and the ceramic matrix powder by laser beams emitted by the laser 20 and the laser conduction device;
step 5, the FDM working head 50 spreads the long fiber material to the next planned processing surface back and forth in a planned path in the direction vertical to the processing direction of the previous processing surface, and the step 3 and the step 4 are repeated;
and (5) repeating the step (5) to form alternate stacking, sintering and molding of the long fiber material and the ceramic matrix powder until the processing is finished.
The long fiber material includes long fibers and a binder. A binder suitable for the long fiber component is used in combination with different long fibers.
In a preferred embodiment, the method is suitable for preparing the SIC/SIC ceramic-based composite material, the long fiber material comprises SIC fibers and a silicon-based binder, the ceramic matrix powder is SIC powder, the silicon-based binder is an organic solvent containing Si and C and is provided with a sintering auxiliary agent, the requirement of FDM extrusion viscosity is met, the amount of released gas is small during decomposition, the silicon-based binder is converted into inorganic silicon after being heated at high temperature and reacts with C under the action of the sintering auxiliary agent to generate β -SiC, the surface of the SIC fibers is provided with a silicon-doped BN coating, the thickness of the silicon-doped BN coating is 0.1-0.5 mu m, the mass ratio of Si is 0.1-0.5%, the coating can be radially or axially shrunk due to heating in the sintering process, the shrinkage rule influencing is obtained by adjusting the frequency of a laser beam, the heating time and the like, the silicon-doped BN coating is radially shrunk to be kept with the fibers, meanwhile, the silicon-doped BN coating is debonded with the ceramic matrix, the silicon-doped BN coating can effectively keep the strength of the SiC fibers and prevent cracks from expanding towards the fiber direction, meanwhile, the boron silicon-doped BN coating can be kept in a compact glass matrix, and the boron-silicon-based composite material can be prevented from invading into a glass fiber surface, and the boron-silicon-.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.