Application of a sacrificial layer cladding powder based on the leidenfrost effect in powder core wire electric arc additive

Abstract

A kind of based on leidenfrost effect's sacrificial layer clad powder and its application in powder core wire electric arc additive, clad powder includes ceramic matrix powder, sacrificial layer cladding powder;Application includes: 1) the above-mentioned sacrificial layer clad powder is used as ceramic particle for additive manufacturing;2) based on ceramic particle, ceramic particle reinforced metal matrix composite material is manufactured.The present application is coated with a layer of sacrificial layer on the surface of ceramic particle, in the process of electric arc additive manufacturing, sacrificial layer is instantaneously gasified to form vapor layer in electric arc high temperature zone, can effectively avoid the dissolution of inner layer ceramic particle, and the forming quality of powder core wire electric arc additive manufacturing is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of powder core wire electric arc additive manufacturing, and particularly relates to a sacrificial layer clad powder based on Leidenfrost effect and application thereof in powder core wire electric arc additive manufacturing. BACKGROUND

[0002] As a branch of metal additive manufacturing technology, electric arc additive manufacturing technology has unique advantages such as high deposition efficiency, low manufacturing cost, high material utilization rate and unlimited forming size, and has wide application prospects in the fields of aviation, aerospace, automobile, electronics and military industry. As one of the forms of raw materials for electric arc additive manufacturing, powder core wire realizes the coupling of wire and powder at the material source, unifies the powder transmission and droplet transition process, has high powder utilization rate, and has unique advantages in electric arc additive manufacturing of particulate reinforced metal matrix composites. However, due to the large heat input in the process of electric arc additive manufacturing, ceramic particles will be completely or partially melted and react with the matrix to form brittle intermetallic compounds, which deteriorates the mechanical properties of the formed composite. In addition, the powder core wire preparation process involves the filling of ceramic powder, and small-sized ceramic particles are easy to agglomerate and have poor flowability, which poses great challenges to the preparation of powder core wire. The above factors seriously restrict the development of powder core wire electric arc additive manufacturing technology. SUMMARY

[0003] The purpose of the present application is to provide a sacrificial layer clad powder based on Leidenfrost effect and application thereof in powder core wire electric arc additive manufacturing.

[0004] The technical scheme adopted to achieve the technical purpose of the present application is as follows: a sacrificial layer clad powder based on Leidenfrost effect, comprising ceramic matrix powder and sacrificial layer clad powder.

[0005] The sacrificial layer clad powder is coated on the outside of the ceramic matrix powder.

[0006] The preparation steps of the sacrificial layer clad powder are as follows:

[0007] S1, placing the reactor in a heated electrode to heat the electrode to the reactor.

[0008] S2, placing the ceramic matrix powder into the reaction zone of the reactor, and introducing active gas and silicon source to make the sacrificial layer clad powder generated by the reaction of the active gas and the silicon source coat the ceramic matrix powder, thereby obtaining the sacrificial layer clad powder.

[0009] Further, the ceramic matrix powder is a reinforcing particle with a melting point higher than that of the metal matrix material.

[0010] Further, the reactor is cleaned before using the reactor to prepare the sacrificial layer clad powder.

[0011] Further, the boiling point of the sacrificial layer coated powder is lower than the melting point of the ceramic matrix powder.

[0012] Further, the active gas comprises an oxidizing agent and a reaction gas.

[0013] Further, the oxidizing agent comprises oxygen.

[0014] The reaction gas comprises chlorine.

[0015] The flow rate of the oxygen and chlorine can be adjusted.

[0016] The silicon source comprises silane.

[0017] The mass flow ratio of the silane and oxygen is 1:10.

[0018] Further, the electrode heating temperature ranges from 600℃ to 800℃.

[0019] Further, a condenser is arranged at the outlet of the reactor.

[0020] The condenser is used to condense the water vapor generated in the reaction process into liquid and discharge.

[0021] Further, the size of the ceramic matrix powder is 20-40 microns.

[0022] The size of the sacrificial layer coated powder is 200-500 nanometers.

[0023] The thickness of the sacrificial layer coated powder on the surface of the ceramic matrix powder is 10-15 microns.

[0024] An application of a sacrificial layer coated powder based on the Leidenfrost effect in powder core wire electric arc additive manufacturing, comprising the following steps:

[0025] The above-mentioned sacrificial layer coated powder is used as a ceramic particle.

[0026] The ceramic particles are doped into a metal matrix material to manufacture a ceramic particle reinforced metal matrix composite material.

[0027] The ceramic particle reinforced metal matrix composite material is used as a powder core wire for additive manufacturing.

[0028] The technical effect of the present application is self-evident, and the present application is inspired by the Leidenfrost effect, a layer of sacrificial layer is coated on the surface of the ceramic particle, and in the process of electric arc additive manufacturing, the sacrificial layer is gasified under high temperature of electric arc, and a steam layer is formed on the surface of the ceramic particle, which effectively isolates heat transfer and avoids the melting of the ceramic particles in the coating.

[0029] The application provides a sacrificial layer sheathed powder based on the Leidenfrost effect and application of the sacrificial layer sheathed powder in powder core wire electric arc additive manufacturing.

[0030] The application provides a sacrificial layer sheathed powder based on the Leidenfrost effect and application of the sacrificial layer sheathed powder in powder core wire electric arc additive manufacturing, a sacrificial layer is deposited on the surface of small-size micron-sized ceramic matrix powder by ALD chemical vapor deposition, the overall particle size is increased by sheathing the small-size ceramic particles with the sacrificial layer, the flowability of the powder is improved, and the difficulty in preparing the powder core wire is greatly reduced.

[0031] The application has the following beneficial effects:

[0032] 1. The application effectively solves the double difficulties of difficulty in preparing a wire caused by poor flowability of small-size ceramic particles in electric arc additive manufacturing and melting of particles in electric arc additive manufacturing, improves the forming quality of metal matrix composite materials in powder core wire electric arc additive manufacturing, and widens the application field of electric arc additive manufacturing technology.

[0033] 2. The application can indirectly control the powder coating thickness by controlling the flow of reaction gas in the reactor and the deposition time, and the powder coating scheme is flexible and has strong applicability.

[0034] 3. The application coats nanoscale ceramic particles on the surface of micron-sized ceramic particles, can obtain a uniform and dense coating layer, and improves the wettability of the ceramic particles and the matrix material, which helps to improve the forming quality of metal matrix composite materials in powder core wire electric arc additive manufacturing.

[0035] 4. The application can form a carrier gas environment in the reaction area by adding Cl2 reaction gas, help uniform mixing and diffusion of silane and oxygen, increase the effective area and rate of the reaction, promote the decomposition and reaction of silane, and at the same time, promote the deposition rate and quality of the reaction product (SiO2).

[0036] 5.The application provides a sacrificial layer clad powder based on the Leidenfrost effect and application thereof in powder core wire electric arc additive manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A preparation method of the sacrificial layer clad powder based on the Leidenfrost effect is shown in the schematic diagram.

[0038] Figure 2 A deposition process structure of the sacrificial layer clad powder based on the Leidenfrost effect is shown in the schematic diagram.

[0039] Figure 3 A coating result structure of the sacrificial layer clad powder based on the Leidenfrost effect is shown in the schematic diagram. Figure 3 (a) is a perspective view of the coating result; Figure 3 (b) is a schematic diagram of a cutting surface of the coating result;

[0040] Figure 4 A structure schematic diagram of the sacrificial layer clad powder based on the Leidenfrost effect and application thereof in powder core wire electric arc additive manufacturing is shown in the schematic diagram.

[0041] In the figure, ceramic matrix powder 1, sacrificial layer clad powder 2, silane 3, oxygen 4, chlorine 5, valve 6, flow meter 7, gas guide pipe 8, reactor 9, heat insulation plate 10, heating electrode 11, condenser 12, sacrificial layer 13, ceramic reinforcing particles 14, matrix 15, molten pool 16, electric arc 17, welding torch 18, clad powder 19, metal strip 20, powder core wire 21, gasification layer 22. DETAILED DESCRIPTION

[0042] The application will be further described below in conjunction with the embodiments, but should not be understood as limiting the above-mentioned subject matter of the application to the following embodiments. According to ordinary technical knowledge and conventional means in the art, various substitutions and modifications can be made without departing from the above-mentioned technical idea of the application, and all of them should be included in the protection scope of the application.

[0043] Embodiment 1

[0044] Reference Figures 1 to 4 A sacrificial layer clad powder based on the Leidenfrost effect, comprising ceramic matrix powder 1 and sacrificial layer clad powder 2.

[0045] The sacrificial layer clad powder 2 is coated on the outside of the ceramic matrix powder 1.

[0046] The preparation steps of the sacrificial layer clad powder are as follows:

[0047] S1 places the reactor in a heated electrode, and the electrode heats the reactor.

[0048] S2 places the ceramic matrix powder into the reaction zone of the reactor, and introduces the active gas and the silicon source, so that the active gas reacts with the silicon source to generate a sacrificial layer to coat the ceramic matrix powder, thereby obtaining a sacrificial layer coated powder.

[0049] Embodiment 2:

[0050] A sacrificial layer coated powder based on the Leidenfrost effect, the main technical content of which is seen in Embodiment 1, further, the ceramic matrix powder 1 is a reinforcing particle with a melting point higher than that of the metal matrix material.

[0051] Embodiment 3:

[0052] A sacrificial layer coated powder based on the Leidenfrost effect, the main technical content of which is seen in any one of Embodiments 1 to 2, further, the reactor is cleaned before using the reactor to prepare the sacrificial layer coated powder.

[0053] Embodiment 4:

[0054] A sacrificial layer coated powder based on the Leidenfrost effect, the main technical content of which is seen in any one of Embodiments 1 to 3, further, the boiling point of the sacrificial layer coated powder 2 is lower than the melting point of the ceramic matrix powder 1.

[0055] Embodiment 5:

[0056] A sacrificial layer coated powder based on the Leidenfrost effect, the main technical content of which is seen in any one of Embodiments 1 to 4, further, the active gas includes an oxidizing agent and a reaction gas.

[0057] Embodiment 6:

[0058] A sacrificial layer coated powder based on the Leidenfrost effect, the main technical content of which is seen in any one of Embodiments 1 to 5, further, the oxidizing agent includes oxygen.

[0059] The reaction gas includes chlorine.

[0060] The flow rates of the oxygen and chlorine are adjustable.

[0061] The silicon source includes silane.

[0062] The mass flow ratio of the silane and oxygen is 1:10.

[0063] Embodiment 7:

[0064] A sacrificial layer coated powder based on Leidenfrost effect, the main technical content is seen in any one of embodiments 1 to 6, further, the electrode heating temperature ranges from 600℃ to 800℃.

[0065] Embodiment 8:

[0066] A sacrificial layer coated powder based on Leidenfrost effect, the main technical content is seen in any one of embodiments 1 to 7, further, a condenser is arranged at the outlet of the reactor.

[0067] The condenser is used to condense the water vapor generated in the reaction process into liquid and discharge.

[0068] Embodiment 9:

[0069] A sacrificial layer coated powder based on Leidenfrost effect, the main technical content is seen in any one of embodiments 1 to 8, further, the size of the ceramic matrix powder 1 is 20μm-40μm.

[0070] The size of the sacrificial layer coated powder 2 is 200nm-500nm.

[0071] The sacrificial layer coated powder 2 coats the surface of the ceramic matrix powder 1 with a thickness of 10μm-15μm.

[0072] Embodiment 10:

[0073] Application of a sacrificial layer coated powder based on Leidenfrost effect in powder core wire electric arc additive, including the following steps:

[0074] The sacrificial layer coated powder of any one of embodiments 1-9 is used as a ceramic particle.

[0075] The ceramic particles are incorporated into the metal matrix material to manufacture a ceramic particle reinforced metal matrix composite material.

[0076] The ceramic particle reinforced metal matrix composite material is used as a powder core wire for additive manufacturing.

[0077] Embodiment 11:

[0078] Referring to Figures 1 to 4 A sacrificial layer coated powder based on Leidenfrost effect, including a ceramic matrix powder 1 and a sacrificial layer coated powder 2.

[0079] The sacrificial layer coated powder 2 is coated on the outside of the ceramic matrix powder 1.

[0080] The preparation steps of the sacrificial layer coated powder are as follows:

[0081] S1 Place the reactor in the heated electrode, and let the electrode heat the reactor.

[0082] S2 puts the ceramic matrix powder into the reaction zone of the reactor, and introduces the active gas and the silicon source, so that the active gas reacts with the silicon source to form a sacrificial layer to coat the ceramic matrix powder, thereby obtaining the sacrificial layer coated powder.

[0083] After preparation, when the temperature of the reactor decreases to room temperature, the reactor is closed, and the deposited coated powder is taken out.

[0084] As shown in Figure 1 Silane 3, oxygen 4, and chlorine 5 pass through valve 6, flow meter 7, and gas guide pipe 8 into reactor 9 in sequence.

[0085] The front end of reactor 9 is provided with heat insulation plate 10.

[0086] Reactor 9 is placed in heating electrode 11.

[0087] Sacrificial layer coated powder 2 is deposited in the reaction zone of reactor 9.

[0088] The reactor is an atomic layer deposition (ALD) chemical vapor deposition reactor.

[0089] As shown in Figure 3 Sacrificial layer 13 composed of sacrificial layer coated powder 2 wraps ceramic reinforcing particles 14.

[0090] Example 12:

[0091] A sacrificial layer coated powder based on the Leidenfrost effect, the main technical content of which is seen in Example 11, further, the ceramic matrix powder is reinforcing particles with a melting point higher than that of the metal matrix material.

[0092] The metal matrix material includes Fe metal matrix material and Ti metal matrix material.

[0093] The ceramic matrix powder (core) material has a melting point higher than that of the metal matrix material.

[0094] Example 13:

[0095] A sacrificial layer coated powder based on the Leidenfrost effect, the main technical content of which is seen in any one of Examples 11 to 12, further, the reactor is cleaned before using the reactor to prepare the sacrificial layer coated powder.

[0096] The reactor is cleaned using a cleaner to remove impurities.

[0097] The cleaner is a high vacuum mass spectrometer, which cleans the ALD reactor to remove any impurities that may cause oxidation.

[0098] Embodiment 14:

[0099] A sacrificial layer cladding powder based on the Leidenfrost effect, the main technical content of which is any one of embodiments 11 to 13, further, the boiling point of the sacrificial layer cladding powder is lower than the melting point of the ceramic matrix powder.

[0100] Embodiment 15:

[0101] A sacrificial layer cladding powder based on the Leidenfrost effect, the main technical content of which is any one of embodiments 11 to 14, further, the active gas includes an oxidizing agent and a reaction gas.

[0102] Embodiment 16:

[0103] A sacrificial layer cladding powder based on the Leidenfrost effect, the main technical content of which is any one of embodiments 11 to 15, further, the oxidizing agent includes oxygen.

[0104] The reaction gas includes chlorine.

[0105] The flow rates of the oxygen and chlorine can be adjusted.

[0106] The silicon source includes silane.

[0107] The mass flow ratio of the silane and oxygen is 1:10. The chlorine flow rate is 50 ml / min.

[0108] Silane (SiH4) is selected as the silicon source, oxygen (O2) is selected as the oxidizing agent, and chlorine (Cl2) is selected as the reaction gas.

[0109] A high vacuum mass spectrometer is used to clean the reactor and exclude any impurities that can cause oxidation, and then the reactor is placed in a heated electrode, oxygen and chlorine are introduced to form active gas, and the flow rates of oxygen and chlorine are adjusted.

[0110] Embodiment 17:

[0111] A sacrificial layer cladding powder based on the Leidenfrost effect, the main technical content of which is any one of embodiments 11 to 16, further, the electrode heating temperature is 600°C, the reaction zone gas pressure is 1.33×10-3MPa, and the deposition time is 30 minutes.

[0112] Embodiment 18:

[0113] A sacrificial layer cladding powder based on the Leidenfrost effect, the main technical content of which is any one of embodiments 11 to 17, further, the electrode heating temperature is 800°C, the reaction zone gas pressure is 1.33×10-3MPa, and the deposition time is 30 minutes.

[0114] Embodiment 19:

[0115] A sacrificial layer coating powder based on the Leiden-Frost effect, the main technical contents of which are described in any one of Examples 11 to 18, and further, a condenser is provided at the outlet of the reactor.

[0116] The condenser is used to condense the water vapor generated during the reaction into liquid and discharge it.

[0117] like Figure 1 As shown, a condenser 12 is provided at the outlet of the reactor 9.

[0118] Example 20:

[0119] A sacrificial layer coating powder based on the Leidenfrost effect, the main technical contents of which are described in any one of Examples 11 to 19, further wherein the size of the ceramic matrix powder 1 is 20μm-40μm.

[0120] The size of the sacrificial layer coated powder 2 is 200nm-500nm.

[0121] The sacrificial layer coated powder 2 has a coating thickness of 10μm-15μm on the surface of the ceramic matrix powder 1.

[0122] The ceramic matrix powder (core) is a reinforcement in ceramic particle-reinforced metal matrix composites in the field of additive manufacturing, with a size of 20μm-40μm.

[0123] The nano-sized ceramic particle-coated powder (shell) is a ceramic particle used in the additive manufacturing field with a size of 200nm-500nm.

[0124] The nano-sized ceramic particles coated on the surface of the ceramic matrix powder (core) have a coating thickness of 10μm-15μm.

[0125] Example 21:

[0126] An application of a sacrificial cladding powder based on the Leidenfrost effect in arc additive manufacturing of powder-core wire includes the following steps:

[0127] The sacrificial coating powder described in any one of Examples 11-20 is used as ceramic particles.

[0128] Ceramic particle-reinforced metal matrix composites are manufactured by incorporating ceramic particles into a metal matrix material.

[0129] The ceramic particle-reinforced metal matrix composite material is used as a powder core filament in additive manufacturing.

[0130] Example 22:

[0131] The application of a sacrificial layer coated powder based on the Leidenfrost effect in powder core wire electric arc additive manufacturing, the main technical content is shown in embodiment 21, further, the sacrificial layer coated powder based on the Leidenfrost effect, the completed ceramic particle filling is applied to the field of electric arc additive manufacturing for preparing metal matrix composites.

[0132] As shown in Figure 4 , the powder core wire 21 is melted by the arc 17 generated by the welding gun 18 to form a molten pool 16 on the base body 15.

[0133] The powder core wire 21 includes a coated powder 19 and a metal strip 20.

[0134] The coated powder 19 includes a ceramic base powder 1 and a sacrificial layer coated powder 2.

[0135] In the droplet process, the gas generated by the sacrificial layer coated powder 2 is not enough to escape and enters the molten pool 16 to form a gasification layer 22.

[0136] Embodiment 23:

[0137] An application method of a sacrificial layer coated powder based on the Leidenfrost effect, comprising the following steps:

[0138] 1) The sacrificial layer coated powder is used as a ceramic particle.

[0139] 2) The ceramic particle is added to the metal matrix material to manufacture a ceramic particle reinforced metal matrix composite material.

[0140] 3) The ceramic particle reinforced metal matrix composite material is used as a powder core wire for additive manufacturing.

[0141] Embodiment 24:

[0142] A preparation method of a sacrificial layer coated powder based on the Leidenfrost effect, comprising the following steps:

[0143] 1) The reactor is placed in a heated electrode, and the electrode heats the reactor.

[0144] 2) The ceramic base powder is placed in the reaction zone of the reactor, and active gas and silicon source are introduced to make the active gas react with the silicon source to generate a sacrificial layer coated powder to coat the ceramic base powder, thereby obtaining a sacrificial layer coated powder.

[0145] Embodiment 25:

[0146] Referring to Figures 1 to 4 , a sacrificial layer coated powder based on the Leidenfrost effect and its application in powder core wire electric arc additive manufacturing mainly include the following contents:

[0147] A kind of based on Leidenfrost effect's sacrificial layer sheath powder, including: micron ceramic particle matrix powder (core), nanoscale ceramic particle coating powder (shell), sacrificial layer powder source material, reactor, cleaner.

[0148] The ceramic matrix powder (core) is the reinforcing body in the ceramic particle reinforced metal matrix composite material in the field of additive manufacturing, and the size is 20-40 μm.

[0149] The nanoscale ceramic particle coating powder (shell) is ceramic particle for the field of additive manufacturing with size 200-500 nm.

[0150] The coating layer source material is several mixed gases for generating nanoscale ceramic particle coating powder by high-temperature gas phase reaction.

[0151] The reactor is an atomic layer deposition (ALD) chemical vapor deposition reactor.

[0152] The cleaner is a high-vacuum mass spectrometer, which cleans the ALD reactor to exclude any impurities that can cause oxidation.

[0153] The ceramic matrix powder (core) is the reinforcing particle of high-melting-point metal matrix material, such as Fe, Ti metal matrix.

[0154] The ceramic matrix powder (core) material has a melting point higher than that of the metal matrix material.

[0155] The ceramic matrix powder (core) particle size is 20-40 μm.

[0156] The nanoscale ceramic particle coating powder (shell) is a ceramic particle coated on the surface of the ceramic matrix powder (core).

[0157] The nanoscale ceramic particle coating powder (shell) material has a boiling point higher than that of the metal matrix material and lower than that of the ceramic matrix powder (core) material.

[0158] The nanoscale ceramic particle coating powder (shell) particle size is 200-500 nm.

[0159] The nanoscale ceramic particle coating powder (shell) is coated on the surface of the ceramic matrix powder (core) with a thickness of 10-15 μm.

[0160] A preparation method of a sacrificial layer sheath powder based on Leidenfrost effect, comprising the following steps:

[0161] ①Silane (SiH4) is selected as silicon source, oxygen (O2) is selected as oxidant, and chlorine (Cl2) is selected as reaction gas.

[0162] ② The reactor is cleaned using a high vacuum mass spectrometer to remove any impurities that can cause oxidation, and then the reactor is placed in a heated electrode, O2 and Cl2 are introduced to form active gas, and the flow rates of O2 and Cl2 are adjusted.

[0163] ③ The ceramic matrix powder (core) is placed in the reaction zone for deposition.

[0164] ④ After deposition is complete, the reactor temperature is lowered to room temperature, the reactor is closed, and the deposited coated powder is removed.

[0165] In step ①, the mass flow ratio of SiH4 and Cl2 is 1:10, and the flow rate of Cl2 is 50 ml / min.

[0166] In step ②, the electrode heating temperature is 1000℃, and the reaction zone gas pressure is 1.33×10-3 MPa.

[0167] In step ③, the deposition time is 30 minutes.

[0168] A condenser is provided at the outlet of the reaction chamber to condense the water vapor generated during the reaction into liquid and discharge it.

[0169] A kind of based on Leiden Frost effect's sacrificial layer sheath powder in the application of powder core wire electric arc additive, using the based on Leiden Frost effect's sacrificial layer sheath powder, the ceramic particles filled into powder core wire after coating are applied to the field of electric arc additive manufacturing for preparing metal matrix composite.

[0170] Example 26:

[0171] Referring to Figures 1 to 4 A kind of based on Leiden Frost effect's sacrificial layer sheath powder and its application in powder core wire electric arc additive, mainly includes the following contents:

[0172] A kind of based on Leiden Frost effect's sacrificial layer sheath powder, by coating a layer of sacrificial layer on the surface of small size reinforcing particles, the overall particle size is increased, the flowability of the powder is improved, the difficulty of preparing powder core wire is greatly reduced, the contradiction between reinforcing particle size and powder core wire preparation is solved, which is conducive to expanding the research and application field of electric arc additive manufacturing.

[0173] Specifically includes the following steps:

[0174] ① Select silane (SiH4) as silicon source, oxygen (O2) as oxidant, and chlorine (Cl2) as reaction gas.

[0175] ② The reactor is cleaned using a high vacuum mass spectrometer to remove any impurities that can cause oxidation, and then the reactor is placed in a heated electrode, O2 and Cl2 are introduced to form active gas, and the flow rates of O2 and Cl2 are adjusted.

[0176] ③ Put the ceramic matrix powder (core) into the reaction zone for deposition.

[0177] ④ After deposition, reduce the reactor temperature to room temperature, close the reactor and take out the deposited coated powder.

[0178] In step ①, the mass flow ratio of SiH4 and O2 is 1:10, and the Cl2 flow rate is 50 ml / min.

[0179] In step ②, the electrode heating temperature is 1000℃, and the reaction zone gas pressure is 1.33×10-3MPa.

[0180] In step ③, the deposition time is 30 minutes.

[0181] In this embodiment, by reasonably planning the coating process parameters such as the source material of the sacrificial layer powder, the relative mass ratio, the flow rate, the reaction temperature, and the reaction time, a specific thickness of the sacrificial layer can be simply and effectively coated on the surface of the small-sized reinforced particles, fundamentally solving the contradiction between the size of the reinforced particles and the preparation of the powder core wire.

[0182] Example 27:

[0183] Referring to Figures 1 to 4 A sacrificial layer coated powder based on the Leidenfrost effect and its application in powder core wire electric arc additive manufacturing mainly includes the following contents:

[0184] The application of a sacrificial layer coated powder based on the Leidenfrost effect in powder core wire electric arc additive manufacturing uses the coated reinforced particle powder in the field of powder core wire electric arc additive manufacturing. The surface coating layer instantaneously vaporizes and acts as a sacrificial layer in the high-temperature zone of electric arc additive manufacturing, effectively preventing the dissolution of ceramic particles during deposition, solving the contradiction between particle dissolution and the forming quality of composite materials in electric arc additive manufacturing, greatly improving the forming quality of electric arc additive manufacturing components, and expanding the application field of the technology.

[0185] Taking the base material 316L stainless steel as an example, a 7×0.3mm 316L stainless steel strip and SiO2 coated TiC ceramic composite powder are used to prepare a powder core wire for electric arc additive manufacturing. The SiO2 ceramic particle size is 200-500nm, and the TiC ceramic particle size is 20-40μm. Cold metal transfer metal active gas shield welding and a 20L / min flow rate of argon and carbon dioxide mixed gas are used as the electric arc additive manufacturing process protection gas.

[0186] According to the prepared composite material powder core wire and the type of arc additive manufacturing technology adopted, the deposition process parameters of the cold metal transition based arc additive manufacturing are determined, including: welding wire diameter 1.2mm, welding current 149A, welding voltage 14.6V, wire feeding speed 4.4m / min, welding speed 0.3m / min, protective gas flow 20L / min, 316L stainless steel substrate size 200mmx200mmx10mm, TiC ceramic particle mass fraction 10wt%.

[0187] In this embodiment, the coated composite powder is used in the field of powder core wire preparation and arc additive manufacturing of metal matrix composites. According to the prepared powder core wire and the type of arc additive manufacturing technology, the deposition process parameters of the TiC reinforced 316L stainless steel composite by arc additive manufacturing are determined, which greatly suppresses the dissolution of ceramic reinforcing particles during composite forming, improves the microstructure and mechanical properties of the deposited layer, and improves the forming quality of arc additive manufacturing.

[0188] Example 28:

[0189] Referring to Figures 1 to 4 A sacrificial layer clad powder based on the Leidenfrost effect and its application in powder core wire arc additive manufacturing mainly includes the following contents:

[0190] A pore defect suppression method for a sacrificial layer clad powder based on the Leidenfrost effect in powder core wire arc additive manufacturing. Taking substrate ultrasonic vibration as an example, by reasonably adjusting the process parameters of powder core wire arc additive manufacturing and ultrasonic vibration coupling, the reduction or elimination of the porosity of the molten pool caused by the gasification of the sacrificial layer can be realized, and the forming quality is improved.

[0191] The pretreated substrate is placed on the ultrasonic vibration platform and clamped, the ultrasonic vibration table vibration frequency is 20KHz, the average amplitude is 20μm, and the arc additive manufacturing process parameters are as follows: welding wire diameter 0.8-1.6mm, welding current 20-250A, welding voltage 5-15V, wire feeding speed 1.0-9.0m / min, welding speed 0.1-1.5m / min.

[0192] Before the arc is started in the arc additive manufacturing equipment, the ultrasonic vibration platform is started first, and after the ultrasonic vibration platform works stably, the powder core wire arc additive manufacturing is carried out, and after the deposition is completed, the ultrasonic vibration platform is stopped after the arc is extinguished in the arc additive manufacturing equipment.

[0193] In this embodiment, due to the short time of droplet transfer stage, part of the gas generated by the gasification of the sacrificial layer cannot escape into the molten pool to form pore defects. To solve this problem, this embodiment provides deposition process assisted by ultrasonic vibration to reduce and suppress the porosity, improve the forming quality of powder core wire arc additive manufacturing, and expand its research and application field.

Claims

1. An application of a sacrificial layer cladding powder based on the Leidenfrost effect in arc additive manufacturing of leaded wire, characterized in that, Includes the following steps: The sacrificial coating powder is used as ceramic particles; Ceramic particle-reinforced metal matrix composites are manufactured by incorporating ceramic particles into a metal matrix material. The ceramic particle-reinforced metal matrix composite material is used as a powder core filament in additive manufacturing; The sacrificial layer coating powder includes ceramic matrix powder (1) and sacrificial layer coating powder (2); The sacrificial layer coating powder (2) is coated on the outside of the ceramic matrix powder (1); The ceramic matrix powder (1) is a reinforcing particle with a melting point higher than that of a metal matrix material; The boiling point of the sacrificial layer coated powder (2) is lower than the melting point of the ceramic matrix powder (1); The ceramic matrix powder (1) has a size of 20μm-40μm; The size of the sacrificial layer coated powder (2) is 200nm-500nm; The sacrificial layer coating powder (2) has a coating thickness of 10μm-15μm on the surface of the ceramic matrix powder (1); The preparation steps of the sacrificial layer coating powder are as follows: S1 places the reactor in a heated electrode, allowing the electrode to heat the reactor; The reactor was also cleaned before being used to prepare the sacrificial layer coating powder. The electrode heating temperature range is 600℃-800℃; A condenser is provided at the outlet of the reactor; The condenser is used to condense the water vapor generated during the reaction into liquid and discharge it. S2 places the ceramic matrix powder into the reaction zone of the reactor and introduces active gas and silicon source, so that the sacrificial layer coating powder generated by the reaction of active gas and silicon source coats the ceramic matrix powder, thereby obtaining sacrificial layer coated powder. The active gas includes an oxidant and a reactive gas; The oxidant includes oxygen; The reacting gas includes chlorine; The flow rates of the oxygen and chlorine are adjustable; The silicon source includes silane; The mass flow ratio of silane to oxygen is 1:10.

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