CN112661513A - Functional gradient material additive manufacturing system based on laser-induced breakdown spectroscopy - Google Patents
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- 239000000463 material Substances 0.000 title claims abstract description 54
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000000654 additive Substances 0.000 title claims abstract description 18
- 230000000996 additive effect Effects 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 168
- 239000011812 mixed powder Substances 0.000 claims abstract description 75
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000013307 optical fiber Substances 0.000 claims description 41
- 238000003860 storage Methods 0.000 claims description 23
- 230000007480 spreading Effects 0.000 claims description 13
- 238000003892 spreading Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000011897 real-time detection Methods 0.000 abstract 1
- OCGWQDWYSQAFTO-UHFFFAOYSA-N tellanylidenelead Chemical compound [Pb]=[Te] OCGWQDWYSQAFTO-UHFFFAOYSA-N 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910002665 PbTe Inorganic materials 0.000 description 5
- 229910052797 bismuth Inorganic materials 0.000 description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 4
- XSOKHXFFCGXDJZ-UHFFFAOYSA-N telluride(2-) Chemical compound [Te-2] XSOKHXFFCGXDJZ-UHFFFAOYSA-N 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910002899 Bi2Te3 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
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- 238000011065 in-situ storage Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention discloses a functional gradient material additive manufacturing system based on laser-induced breakdown spectroscopy, which mainly comprises a powder premixing device, an LIBS powder component detection system, an additive manufacturing system and a control system. This device mainly detects the ratio of the mixed powder among the powder premixing device through LIBS powder composition detecting system, and control system adjusts the mixed powder volume in real time according to detecting feedback information, controls the mixed powder ratio among the powder premixing device, realizes the accurate control of material mixed powder ratio. The invention can manufacture high-precision and high-performance functionally gradient materials by real-time detection and feedback control of mixed powder in the powder premixing device.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a functional gradient material additive manufacturing system based on laser-induced breakdown spectroscopy.
Background
The additive manufacturing technology is a technology for forming a three-dimensional part by gradually accumulating materials, slicing and scanning path planning are carried out on the part through three-dimensional modeling software, then high-energy laser beams are utilized to irradiate the material powder, so that the material powder is rapidly melted and solidified, and the required part is formed by stacking layer by layer.
The functionally graded material is a novel material in which the composition and structure of the material continuously change from one orientation of the material to another, so that the properties and functions of the material also exhibit a gradient change. The existing additive manufacturing technology can only realize the forming manufacturing of a single material, but cannot realize the forming manufacturing of a functionally graded material. Some additive manufacturing equipment can realize the mixing of multiple material powders through the improvement of a powder spreading device, but because the proportioning of the mixed powder is difficult to accurately control, the functional gradient material with high performance is difficult to manufacture.
Laser Induced Breakdown Spectroscopy (LIBS) is a material composition detection technique that uses high-energy laser pulses focused on the surface of a sample, where when the high-energy laser is focused on the surface of the material and reaches an optical breakdown threshold, a portion of the material at the point where the sample is focused is converted to a plasma state, and then a signal collector collects the spectrum from the plasma and a spectrometer analyzes the collected spectral information, thereby accurately determining the composition of the sample being measured. The LIBS detection has the advantages of real-time, rapid and on-site in-situ detection and multi-element simultaneous detection. In addition, the state of the sample detected using the LIBS technique may be solid, liquid or even gaseous, and the sample does not need to be pretreated. In principle, laser induced breakdown spectroscopy can detect all elements, and if the composition of the material to be analyzed is known, LIBS can be used to assess the relative abundance of each constituent element.
The Laser Induced Breakdown Spectroscopy (LIBS) technology and the additive manufacturing technology are combined, so that the aim of accurately detecting the proportion of mixed powder of different materials can be fulfilled, and the rapid forming manufacturing of the high-precision and high-performance functionally-graded material is realized.
Disclosure of Invention
The invention aims to provide a functional gradient material powder premixing additive manufacturing system based on laser-induced breakdown spectroscopy, which has the characteristics of accurate detection and real-time adjustment of the proportion of material mixed powder.
The technical scheme adopted by the invention is as follows:
a functional gradient material additive manufacturing system based on laser-induced breakdown spectroscopy comprises a forming chamber, wherein a fiber laser is arranged in the forming chamber and generates a forming laser beam; the formed laser beam passes through the beam isolator, the beam expander, the scanning galvanometer,F-θFocusing on the surface of the mixed powder in a forming cylinder at the bottom of the forming chamber after the mirror so as to melt the mixed powder; after the shaping laser beam leaves the surface of the mixed powder, the melted mixed powder is solidified to form a shaped piece;
the bottom of the forming chamber is provided with a powder spreading roller, the powder spreading roller uniformly spreads the mixed powder on the upper surface of the existing mixed powder in the forming cylinder, and the redundant mixed powder enters the bottom of the forming cylinder of the powder recovery cylinder under the action of the powder spreading roller and is provided with a first lifting platform and a second lifting platform at the bottom of the recovery cylinder;
the forming chamber is also internally provided with a powder mixing system for generating mixed powder, the powder mixing system comprises at least 2 powder storage tanks, the bottom of each powder storage tank is provided with a powder outlet, and the powder outlet is provided with a valve controlled by a computer; the powder at each powder outlet falls into the powder premixing device; the powder premixing device can rotate or vibrate to mix the powder uniformly; a valve controlled by a computer is arranged below the powder premixing device, so that the powder in the powder premixing device can fall into the bottom of the forming chamber;
an LIBS powder component detection system is arranged above the powder premixing device and comprises an LIBS laser, an LIBS laser projects a detection laser beam on the surface of mixed powder stored in the powder premixing device through an X-Y scanning system, array-type detection points are manufactured on the surface of the mixed powder, and signals are transmitted to a computer; the spectrometer obtains information on the composition and content of the mixed powder by detecting spectral information of a detection point in a plasma state made on the surface of the mixed powder by a detection laser beam.
Further, the powder premixing device is in a funnel shape
Further, a vibration motor is arranged at the bottom of the powder premixing device, and the powder premixing device is connected with the motor through a transmission belt; the vibration motor makes the powder premixing device vibrate up and down, and the motor makes the powder premixing device rotate through a transmission belt.
Further, the LIBS laser, the X-Y scanning system and the spectrometer are all connected with the computer through optical fibers.
Furthermore, the forming chamber is connected with a protective gas chamber, the protective gas chamber provides protective gas to prevent the powder from being oxidized, and the detection process and the forming process of the powder are protected.
Furthermore, the computer controls to obtain the component and content information of the mixed powder stored in the powder premixing device through the spectrometer, and the volume of the powder stored in each powder storage tank entering the powder premixing device is adjusted according to the component and content information of the mixed powder, so that the component proportion of the mixed powder is accurately controlled
The invention has the beneficial effects that:
(1) by utilizing a Laser Induced Breakdown Spectroscopy (LIBS) technology, the powder ratio of various mixed powders can be accurately detected, and the uniformity of the mixed powder of the material can be recorded in real time;
(2) the proportion of the mixed powder of various materials can be adjusted in real time by utilizing laser-induced breakdown spectroscopy detection information, so that the rapid forming and manufacturing of the high-precision and high-performance functionally-graded material are realized;
(3) the powder premixing device can mix the mixed powder more uniformly by the rotation and vibration of the motor.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a top view of the powder pre-mixing device of the present invention.
FIG. 3 is a schematic structural view of a sample of a functionally graded thermoelectric material of the present invention.
In the figure: 1. the device comprises a forming chamber, 2, a protective gas chamber, 3, an optical fiber laser, 3a, an optical fiber I, 4, a beam isolator, 5, a beam expanding lens, 6, a scanning galvanometer and 7.F-θMirror, 8. forming piece, 9. mixed powder, 10. formed laser beam, 11. first powder storage tank, 12. first powder outlet, 13. first valve, 14. first valve control motor, 14a. optical fiber two, 15. second powder storage tank, 16. second powder outlet, 17. second valve, 18. second valve control motor, 18a. optical fiber three, 19.LIBS laser, 19a. optical fiber four, 20.X-Y scanning system, 20a. optical fiber five, 21. spectrometer, 21a. optical fiber six, 22. detection laser beam, 23. powder pre-mixing device, 24. motor, 25. driving belt, 26. vibration motor, 27. powder laying roller, 28. forming cylinder, 29. first lifting platform, 30. powder recovery cylinder, 31. second lifting platform, 32. computer control system, 33. detection point, 34. third valve, 35. third valve control motor, 35a. optical fiber seven, 36. a functionally graded thermoelectric material.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1 and 2, the present invention includes a powder premixing device, a LIBS powder composition detecting system, an additive manufacturing system, and a control system.
The powder mixing system comprises a first powder storage tank 11, a first powder outlet 12, a second powder storage tank 15, a second powder outlet 16 and a powder premixing device 23; the first powder outlet 12 is positioned below the first powder storage tank 11, the second powder outlet 16 is positioned below the second powder storage tank 15, and different types of powder materials are respectively stored in the first powder storage tank 11 or the second powder storage tank 15; the powder stored in the first powder storage tank 11 may fall into the powder premixing device 23 after passing through the first powder outlet 12, and the powder stored in the second powder storage tank 15 may also fall into the powder premixing device 23 after passing through the second powder outlet 16.
The LIBS powder component detection system comprises an LIBS laser 19, an X-Y scanning system 20 and a spectrometer 21; the LIBS laser 19 projects a detection laser beam 22 on the surface of the mixed powder 9 stored in the powder pre-mixing device 23 through an X-Y scanning system 20; the spectrometer 21 obtains the component and content information of the mixed powder 9 by detecting the spectral information of a detection point 33 in a plasma state, which is manufactured on the surface of the mixed powder 9 by the detection laser beam 22;
the additive manufacturing system comprises a forming chamber 1, a protective gas chamber 2, a fiber laser 3, a beam isolator 4, a beam expanding lens 5, a scanning galvanometer 6, an F-theta lens 7, a powder spreading roller 27, a forming cylinder 28, a first lifting platform 29, a powder recovery cylinder 30 and a second lifting platform 31; the optical fiber laser 3 generates a shaped laser beam 10; the formed laser beam 10 passes through the beam isolator 4, the beam expander 5, the scanning galvanometer 6 and the F-theta lens 7 and is focused on the surface of the mixed powder 9, so that the mixed powder 9 is melted; after the shaping laser beam 10 leaves the surface of the mixed powder 9, the mixed powder 9 which has been melted solidifies to form the shaping member 8; the beam isolator 4 is used for blocking reflected laser; the beam expander 5 is used for expanding the light beam and improving the collimation characteristic of the light beam; the scanning galvanometer 6 is used for changing the path of the shaping laser beam 10; the F-theta mirror 7 is used for forming a focusing light spot with uniform size on the forming surface of the mixed powder 9 by the forming laser beam 10; the powder paving roller 27 is used for uniformly paving the mixed powder 9 on the upper surface of the existing mixed powder 9 in the forming cylinder 28, and the redundant mixed powder 9 enters the powder recovery cylinder 30 under the action of the powder paving roller 27; after the layer of mixed powder 9 is melted and formed, the first lifting platform 29 descends by one layer, the powder spreading roller 27 starts to spread powder again, and a new layer of printing work is started; the second elevating platform 31 adjusts the height of the powder stored in the powder recovery cylinder 30 so that the height of the powder is not higher than the bottom surface of the molding chamber 1 by way of lowering.
The control system comprises a first optical fiber 3a, a first valve 13, a first valve control motor 14, a second optical fiber 14a, a second valve 17, a second valve control motor 18, a third optical fiber 18a, a fourth optical fiber 19a, a fifth optical fiber 20a, a sixth optical fiber 21a, a motor 24, a transmission belt 25, a vibration motor 26, a computer control system 32, a third valve 34, a third valve control motor 35 and a seventh optical fiber 35 a; the computer control system 32 is connected with the first optical fiber 3a, the second optical fiber 14a, the third optical fiber 18a, the fourth optical fiber 19a, the fifth optical fiber 20a, the sixth optical fiber 21a and the seventh optical fiber 35 a; the computer control system 32 controls the optical fiber laser 3 to generate a shaped laser beam 10 through the first optical fiber 3 a; the first valve control motor 14 is connected with the first valve 13 and can control the opening and closing of the first valve 13, so that the computer control system 32 controls the first valve control motor 14 through the second optical fiber 14a and indirectly controls the opening and closing of the first valve 13; the second valve control motor 18 is connected with the second valve 17, and can control the opening and closing of the second valve 17, therefore, the computer control system 32 controls the second valve control motor 18 through the optical fiber III 18a, and indirectly controls the opening and closing of the second valve 17; the computer control system 32 controls the LIBS laser 19 to generate the detection laser beam 22 through the optical fiber IV 19a, and controls the X-Y scanning system 20 through the optical fiber V20 a to change the direction of the detection laser beam 22, so that a plurality of detection points 33 can be obtained on the surface of the mixed powder 9 in the powder pre-mixing device 23; the computer control system 32 controls the spectrometer 21 through the optical fiber six 21a, detects the spectrum information of the detection point 33, and further obtains the component and content information of the mixed powder 9; the third valve control motor 35 is connected to the third valve 34 to control the opening and closing of the third valve 34, so that the computer control system 32 controls the third valve control motor 35 via the optical fiber seven 35a and indirectly controls the opening and closing of the third valve 34; the motor 24 drives the powder premixing device 23 to rotate through the transmission belt 25, and the vibration motor 26 is connected with the powder premixing device 23 and positioned below the powder premixing device 23 to vibrate the powder premixing device 23.
The number of the first powder storage tanks 11 or the second powder storage tanks 15 is not limited, and the number of the powder storage tanks can be increased according to the increase of the kinds of the powder materials.
The powder premixing device 23 is a funnel-shaped container having an opening at the lower side thereof, and is capable of spreading the mixed powder 9 on the bottom surface of the molding chamber 1.
The protective gas chamber 2 is connected with the forming chamber 1, and the protective gas chamber 2 provides protective gas to prevent the powder from being oxidized and protect the detection process and the forming process of the powder;
the computer control system 32 adjusts the volume of the powder stored in the first powder storage tank 11 and the second powder storage tank 15 entering the powder premixing device 23 through the information of the components and the content of the mixed powder 9 stored in the powder premixing device 23 detected by the spectrometer 21, thereby realizing the accurate control of the powder component ratio of the mixed powder 9.
As shown in fig. 1 and 2, the X-Y scanning system 20 can change the direction of the detection laser beam 22 to precisely analyze the composition and content of the mixed powder 9 stored in the powder pre-mixing device 23 by making an array-type detection point 33 on the surface of the mixed powder 9 and transmitting a signal to the computer control system 32.
For further understanding of the contents, features and effects of the present invention, the following embodiments are enumerated in conjunction with the accompanying drawings, and the following detailed description is given:
as shown in FIG. 3, the functionally graded material is composed of two or more materials with continuously graded composition and structure, such as functionally graded thermoelectric material 36, and low temperature material bismuth telluride (Bi)2Te3) And a medium-temperature material of lead telluride (PbTe), and a low-temperature material of bismuth telluride (Bi)2Te3) The functional gradient thermoelectric material 36 is suitable for a low-temperature interval, the intermediate-temperature material lead telluride (PbTe) is suitable for an intermediate-temperature interval, the ratio of bismuth telluride to lead telluride is gradually transited from 1:0 to 0:1, and the continuous change of the thermoelectric performance of the functional gradient thermoelectric material 36 is realized, so that the functional gradient thermoelectric material 36 has better thermoelectric conversion performance in the whole temperature difference interval.
To fabricate such a functionally graded thermoelectric material 36, as shown in FIGS. 1, 2, and 3, the computer control system 32 first determines the low temperature material bismuth telluride (Bi) based on the particular stages of printing2Te3) And the proportion of a medium-temperature material lead telluride (PbTe). Then, the computer control system 32 controls the first valve control motor 14 through the second optical fiber 14a, and indirectly controls the opening and closing time of the first valve 13 to make a certain amount of Bi2Te3The powder falls from the first powder storage tank 11 to the powder premixing device 23, and the computer control system 32 controls the second valve control motor 18 through the third optical fiber 18a, and indirectly controls the opening and closing time of the second valve 17, so that a certain amount of PbTe powder falls from the second powder storage tank 15 to the powder premixing device 23. The powder premixing device 23 is driven by a motor 24 and a transmission belt 25 to rotate, and vibrates under the action of a vibration motor 26, so that the powder is uniformly mixed.
The high performance functionally graded thermoelectric material 36 requires that the thermoelectric material can achieve an accurate mixing ratio in each region, and the initial pre-mixing process is prone to cause the mixing ratio of the pre-mixed powder to deviate from the predetermined ratio due to various uncontrollable factors such as rapid powder falling, uneven powder falling speed, and the like. Therefore, it is necessary to detect the components and the ratio of the powders by a Laser Induced Breakdown Spectroscopy (LIBS) apparatus and adjust the mixing ratio of the powders by feedback.
The computer control system 32 controls the LIBS laser 19 to generate the detection laser beam 22 through the optical fiber four 19a and controls the X-Y scanning system 20 through the optical fiber five 20a to change the direction of the detection laser beam 22 so that it can take a plurality of detection points 33 on the surface of the mixed powder 9 in the powder pre-mixing device 23. The detection point 33 generates plasma under the action of the laser beam 22 and emits spectral information. Subsequently, the computer control system 32 controls the spectrometer 21 through the optical fiber six 21a, detects the spectral information of the plasma on the detection point 33, and further obtains the component and content information of the mixed powder 9; finally, the computer control system 32 finely adjusts the opening and closing of the first valve 13 and the second valve 17 based on the information collected by the spectrometer 21 so that the appropriate amount of Bi is present2Te3The powder and the PbTe powder fall into the powder premixing device 23 while the powder premixing device 23 is rotated and vibrated to further mix the powders uniformly.
The computer control system 32 controls the third valve control motor 35 through the optical fiber seven 35a, indirectly controls the opening and closing of the third valve 34, so that the mixed powder 9 in the powder pre-mixing device 23 falls to the bottom surface of the forming chamber 1, the mixed powder 9 is uniformly spread on the upper surface of the mixed powder 9 existing in the forming cylinder 28 through the powder spreading roller 27, and the redundant mixed powder 9 enters the powder recovery cylinder 30 under the action of the powder spreading roller 27.
The computer control system 32 controls the optical fiber laser 3 to generate a shaped laser beam 10 through the first optical fiber 3a, and the shaped laser beam 10 passes through the beam isolator 4, the beam expander 5, the scanning galvanometer 6 and the F-theta mirror 7 and then is focused on the surface of the mixed powder 9 to melt the mixed powder 9. After the shaping laser beam 10 leaves the surface of the mixed powder 9, the mixed powder 9 that has been melted solidifies to form the shaped member 8. The beam isolator 4 is used for blocking reflected laser; the beam expander 5 is used for expanding the light beam and improving the collimation characteristic of the light beam; the scanning galvanometer 6 is used for changing the path of the shaping laser beam 10; the F-theta mirror 7 is used to shape the shaped laser beam 10 into a focused spot of uniform size on the shaped surface of the mixed powder 9.
After the layer of mixed powder 9 is melted and formed, the first lifting platform 29 descends by one layer, the powder spreading roller 27 starts to spread powder again, and a new layer of printing work is started; the second elevating platform 31 adjusts the height of the powder stored in the powder recovery cylinder 30 so that the height of the powder is not higher than the bottom surface of the molding chamber 1 by way of lowering. The shielding gas chamber 2 is connected with the forming chamber 1, and the shielding gas chamber 2 provides shielding gas to prevent the powder from being oxidized and protect the detection process and the forming process of the powder.
The structure of the finished functionally graded thermoelectric material 36 is shown in fig. 3.
The foregoing detailed description is intended to illustrate and not limit the invention, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the invention are intended to be covered by the following claims.
Claims (6)
1. A functional gradient material additive manufacturing system based on laser-induced breakdown spectroscopy comprises a forming chamber, and is characterized in that a fiber laser is arranged in the forming chamber and generates a forming laser beam; the formed laser beam passes through the beam isolator, the beam expander, the scanning galvanometer,F-θFocusing on the surface of the mixed powder in a forming cylinder at the bottom of the forming chamber after the mirror so as to melt the mixed powder; after the shaping laser beam leaves the surface of the mixed powder, the melted mixed powder is solidified to form a shaped piece;
the bottom of the forming chamber is provided with a powder spreading roller, the powder spreading roller uniformly spreads the mixed powder on the upper surface of the existing mixed powder in the forming cylinder, and the redundant mixed powder enters the bottom of the forming cylinder of the powder recovery cylinder under the action of the powder spreading roller and is provided with a first lifting platform and a second lifting platform at the bottom of the recovery cylinder;
the forming chamber is also internally provided with a powder mixing system for generating mixed powder, the powder mixing system comprises at least 2 powder storage tanks, the bottom of each powder storage tank is provided with a powder outlet, and the powder outlet is provided with a valve controlled by a computer; the powder at each powder outlet falls into the powder premixing device; the powder premixing device can rotate or vibrate to mix the powder uniformly; a valve controlled by a computer is arranged below the powder premixing device, so that the powder in the powder premixing device can fall into the bottom of the forming chamber;
an LIBS powder component detection system is arranged above the powder premixing device and comprises an LIBS laser, an LIBS laser projects a detection laser beam on the surface of mixed powder stored in the powder premixing device through an X-Y scanning system, array-type detection points are manufactured on the surface of the mixed powder, and signals are transmitted to a computer; the spectrometer obtains information on the composition and content of the mixed powder by detecting spectral information of a detection point in a plasma state made on the surface of the mixed powder by a detection laser beam.
2. The system according to claim 1, wherein the pre-powder mixing device is funnel-shaped.
3. The system for functionally graded material additive manufacturing based on laser-induced breakdown spectroscopy according to claim 1, wherein a vibration motor is arranged at the bottom of the powder premixing device, and the powder premixing device is connected with the motor through a transmission belt; the vibration motor makes the powder premixing device vibrate up and down, and the motor makes the powder premixing device rotate through a transmission belt.
4. The system for functionally graded material additive manufacturing based on laser induced breakdown spectroscopy as claimed in claim 1, wherein the LIBS laser, the X-Y scanning system and the spectrometer are all connected with the computer through optical fibers.
5. The system of claim 1, wherein a shielding gas chamber is connected to the forming chamber, the shielding gas chamber provides a shielding gas to prevent oxidation of the powder, and the powder detection process and the forming process are protected.
6. The system for functionally graded material additive manufacturing based on laser-induced breakdown spectroscopy as claimed in claim 1, wherein the computer controls to obtain the information of the components and contents of the mixed powder stored in the powder pre-mixing device through a spectrometer, and the volume of the powder stored in each powder storage tank entering the powder pre-mixing device is adjusted according to the information of the components and contents of the mixed powder, so as to realize the precise control of the component ratio of the mixed powder.
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| CN114166829A (en) * | 2021-12-08 | 2022-03-11 | 华中科技大学鄂州工业技术研究院 | Slurry uniformity detection system and method |
| CN114166829B (en) * | 2021-12-08 | 2023-09-19 | 华中科技大学鄂州工业技术研究院 | Slurry uniformity detection system and method |
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