LU501912B1 - Low-cost titanium alloy indirect additive manufacturing method - Google Patents
Low-cost titanium alloy indirect additive manufacturing method Download PDFInfo
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- LU501912B1 LU501912B1 LU501912A LU501912A LU501912B1 LU 501912 B1 LU501912 B1 LU 501912B1 LU 501912 A LU501912 A LU 501912A LU 501912 A LU501912 A LU 501912A LU 501912 B1 LU501912 B1 LU 501912B1
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- powder
- titanium alloy
- degreasing
- binder
- green body
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 235000019531 indirect food additive Nutrition 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 69
- 238000005238 degreasing Methods 0.000 claims abstract description 38
- 239000011230 binding agent Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000007639 printing Methods 0.000 claims abstract description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 14
- 229920003023 plastic Polymers 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 238000001746 injection moulding Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 239000010936 titanium Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 230000001788 irregular Effects 0.000 claims abstract description 5
- 238000011068 loading method Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000001272 pressureless sintering Methods 0.000 claims abstract description 3
- 238000005245 sintering Methods 0.000 claims description 31
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 229910052727 yttrium Inorganic materials 0.000 claims description 19
- 239000011812 mixed powder Substances 0.000 claims description 18
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 17
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 14
- 229910052786 argon Inorganic materials 0.000 claims description 10
- -1 polyethylene Polymers 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 235000021355 Stearic acid Nutrition 0.000 claims description 7
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 7
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000012188 paraffin wax Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 239000008117 stearic acid Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000010894 electron beam technology Methods 0.000 claims description 3
- 239000012454 non-polar solvent Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 2
- 238000005984 hydrogenation reaction Methods 0.000 claims description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 24
- 239000000956 alloy Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 238000005094 computer simulation Methods 0.000 description 5
- 238000010146 3D printing Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000000280 densification Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010017 direct printing Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/12—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/10—Formation of a green body
- B22F10/18—Formation of a green body by mixing binder with metal in filament form, e.g. fused filament fabrication [FFF]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/62—Treatment of workpieces or articles after build-up by chemical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/64—Treatment of workpieces or articles after build-up by thermal means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Composite Materials (AREA)
- Structural Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
Disclosed is a low-cost titanium alloy indirect additive manufacturing method, including the following steps: fully mixing, stirring and heating spherical powder and/or titanium or titanium alloy powder doped with irregular shapes with a binder; preparing the mixed and stirred power into a granular feed by a granulator, and then using an injection molding machine to process the granular feed into a titanium alloy wire material; loading the titanium alloy wire material on a conventional plastic 3D printer, and printing a titanium alloy green body; putting the green body into a solvent degreasing device or a container, and degreasing to remove the binder; and consolidating the titanium alloy green body by a high-temperature pressureless sintering method, to obtain a highly dense titanium alloy indirect printed product.
Description
LOW-COST TITANIUM ALLOY INDIRECT ADDITIVE MANUFACTURING 4501912
METHOD
[01] The present invention belongs to the technical field of additive manufacturing, and particularly relates to a low-cost titanium alloy indirect additive manufacturing method.
[02] A currently popular titanium alloy additive manufacturing technology, such as laser or electron beam fuse-wire printing, is a direct printing method that melts titanium or titanium alloy powder (or wire material) locally and layer by layer with high energy to fusion-weld and manufacture a titanium alloy part. However, because a 3D printing device thereof is expensive and an additive manufacturing technology for directly printing a titanium alloy has a complex thermal cycle and a higher processing residual stress, the deformation and failure of the printed part are caused, so the development of the industrialization of an additively manufactured titanium alloy is limited.
[03] A purpose of the present invention is to provide a low-cost titanium alloy indirect additive manufacturing (3D printing) method, and it may greatly reduce the cost of manufacturing titanium alloy parts, so that a titanium alloy material is more widely used in engineering.
[04] A technical problem to be solved by the present invention is to provide a low-cost titanium alloy indirect additive manufacturing method, in order to overcome the high costs of the 3D printing device and powder raw materials mentioned above in the prior art.
[05] According to the above deficiencies, the present invention provides a low-cost titanium alloy indirect additive manufacturing method.
[06] A technical scheme of the present invention is as follows.
[07] A low-cost titanium alloy indirect additive manufacturing method, including the following steps:
[08] S1. power mixing: fully mixing, stirring and heating spherical powder and/or titanium or titanium alloy powder doped with irregular shapes with a binder, wherein the powder contains a yttrium element which is 0.2~1.8% of the total weight of the mixed powder, the addition amount of the binder accounts for 25~45% of the total volume of the mixed powder, and the binder is prepared by the following raw materials in parts by weight: 45~55 parts of a polyethylene polymer, 45~55 parts of a paraffin wax, and 4~5 parts of a stearic acid;
[09] S2. granulating and wire making: after cooling the powder to be mixed and stirred, preparing into a granular feed by a granulator or a crusher, and then using an injection molding machine or a wire making machine to process the granular feed into a titanium alloy wire material for indirect additive manufacturing;
[10] S3. wire printing: loading the titanium alloy wire material on a conventional 1 plastic 3D printer, and printing a titanium alloy green body by the 3D printer according LU501912 to a three-dimensional modeling program in a computer;
[11] S4. solvent degreasing: putting the green body into a solvent degreasing device or a container, and performing the solvent degreasing in a strong non-polar solvent with a certain flow rate, to remove a part of the binder;
[12] thermal degreasing: drying the solvent-degreased green body, putting it into a degreasing sintering retort furnace, slowly heating in an argon gas with a certain flow rate, and removing the remaining binder by a thermal degreasing method; and
[13] SS sintering: consolidating the titanium alloy green body with two-step degreasing and binder removal by a high-temperature pressureless sintering method, and after cooling to a room temperature, acquiring a highly dense titanium alloy indirect printed product.
[14] In the present invention, the selected rare earth yttrium element is a powerful oxygen atom trapping agent. In the sintering process of the S5, it may effectively extract oxygen atoms from a surrounding titanium alloy matrix, and react to generate an yttrium oxide, thereby the mechanical failure in the titanium alloy sintering printed part caused by excessive oxygen impurities in the matrix because of the use of low-cost titanium alloy powder is reduced.
[15] The particle size of the yttrium oxide generated by the above reaction has significant genetic characteristics of an original material, namely it may basically inherit the particle size characteristics of the original yttrium element while being added, the larger yttrium oxide particles are easily distributed at the junction of grain boundaries and sintered pores, and the smaller yttrium oxide particles are easily distributed inside primary grains.
[16] Further, in the step S1, the spherical powder and/or titanium or titanium alloy powder doped with the irregular shapes includes: plasma atomized powder, electron beam atomized powder, gas atomized powder, rotary electrode powder, hydrogenated dehydrogenation powder, hydrogenation powder and/or mechanical grinding powder.
[17] Further, in the step S1, the titanium or titanium alloy powder itself contains an yttrium element, or, yttrium element powder, yttrium element-containing intermediate alloy powder and/or yttrium compound ceramic powder are added during the powder mixing.
[18] Preferably, the maximum particle size of the yttrium element powder, the yttrium element-containing intermediate alloy powder or the yttrium compound ceramic powder added during the powder mixing is in the range of 15~63 um.
[19] Preferably, in the step S1, the addition amount of the binder accounts for 25~45% of the total volume of the mixed powder.
[20] Preferably, in the step S1, the temperature during the powder mixing is 110 ~ 170°C, and the stirring time is 2~6 h; in the step S2, the temperature of an injection nozzle of the injection molding machine or the wire making machine is 110 ~ 150°C; and in the step S3, the temperature range of a printing nozzle of the plastic 3D printer is 110~170°C.
[21] Preferably, in the step S4, the strong non-polar solvent degreasing includes immersing the printed green body in hexane solution, and controlling the temperature of 2 the hexane to be 40~60°C, wherein the flow rate is 0-20 cm/s, and it is kept for 5-20 h; LU501912 and drying for 30~90 min, then putting it into a degreasing sintering retort furnace, and slowly heating to 550~680°C under argon flushing, wherein the argon flow rate is 100~200 L/h.
[22] In order to obtain the higher performance requirements, that is, to further improve the mechanical properties and dimensional accuracy thereof, in the step S3, densification cold isostatic pressing treatment and surface finishing treatment are performed on the printed green body; and in the step S5, under conditions of 910°C and 120 MPa, hot isostatic pressing, gas isostatic forging (GIF) or shot blasting surface treatment is performed.
[23] The low-cost titanium alloy indirect additive manufacturing method of the present invention solves a problem of the cost limitation of raw materials and processing device of a conventional direct metal 3D printing technology, avoids the deformation and failure of directly printed parts caused by the excessive processing stress, effectively improves the yield of the titanium alloy parts, and is an important supplement to the field of the additive manufacturing of the titanium alloy.
[24] The present invention has the beneficial effects of low material cost, low printing device cost and good quality of printed products.
[25] FIG. 1 is a flow diagram of the present invention.
[26] The low-cost titanium alloy indirect additive manufacturing method is further explained below with reference to specific embodiments, but the embodiments do not limit the present invention in any form.
[27] Embodiment 1: Method of indirectly printing titanium alloy part with spherical titanium powder mixed with hydrogenated dehydrogenation titanium powder and rare earth yttrium powder
[28] Spherical pure titanium powder accounting for 50% of the total weight of the mixed powder, hydrogenated dehydrogenation titanium powder accounting for 49.8% of the total weight of the mixed powder, yttrium element powder accounting for 0.2% of the total weight of the mixed powder and a binder accounting for 25% of the total volume of the feed are put into a Sigma powder mixer, it is stirred and mixed for 2 h at a temperature of 110°C, and the binder is prepared by the following raw materials in parts by weight: 45 parts of a polyethylene polymer, 45 parts of a paraffin wax, and 4 parts of a stearic acid; then it is prepared into a granular feed with a diameter of less than 5 mm by using a granulator; an injection molding machine is used, to manufacture an indirect additively manufactured wire feed, wherein the temperature of an injection nozzle is 110°C; and then a wire material with a diameter of 2 mm is obtained, and the wire material is loaded on a conventional plastic 3D printer, the temperature of a print nozzle is 110°C, and it is imported into a plastic printer according to computer modeling, to print a green body. The printed green body is placed in a hexane solvent, and kept at 60°C for 5 h. After being dried for 30 min, it is put in a degreasing sintering retort 3 furnace, slowly heated to 550°C, and an argon stream is fed at the same time, to perform LU501912 thermal degreasing. Subsequently, the vacuum degree of the degreasing sintering retort furnace is adjusted to 10-6 mbar, a degreasing blank is sintered, the sintering temperature is 1300°C, and the sintering time is 4 h. The indirect additively manufactured titanium alloy part may be obtained after being cooled.
[29] Embodiment 2: Method of indirectly printing titanium alloy part with low-cost hydrogenated dehydrogenation titanium alloy powder mixed with other metallic powder
[30] Hydrogenated dehydrogenation TC4 (Ti-6Al-4V) titanium alloy powder accounting for 94.5% of the total weight of the mixed powder, conventional 316L stainless steel powder accounting for 5% of the total weight of the mixed powder, yttrium element powder accounting for 0.5% of the total weight of the mixed powder and a binder accounting for 36% of the total volume of the feed are put into a Sigma powder mixer, it is stirred and mixed for 4 h at a temperature of 150°C, and the binder is prepared by the following raw materials in parts by weight: 47 parts of a polyethylene polymer, 48 parts of a paraffin wax, and 5 parts of a stearic acid; and the use of the 316L stainless steel powder is beneficial to the sintering and densification of titanium alloy parts, and is a sintering aid. It is prepared into a granular feed with a diameter of less than 5 mm by using a granulator. An injection molding machine is used, to manufacture an indirect printing wire feed, and wherein the temperature of an injection nozzle is 130°C. Then a wire material with a diameter of 2 mm is obtained, and the wire material is loaded on a conventional plastic 3D printer, the temperature of a print nozzle is 130°C, and it is imported into a plastic printer according to computer modeling, to print a green body. The printed green body is placed in a hexane solvent, and kept at 50°C for 10 h.
After being dried for 60 min, it is put in a degreasing sintering retort furnace, slowly heated to 650°C, and an argon stream is fed at the same time, to perform thermal degreasing. Subsequently, the vacuum degree of the degreasing sintering retort furnace is adjusted to 10-6 mbar, a degreasing blank is sintered, the sintering temperature is 1350°C, and the sintering time is 4 h. The indirect printed beta-type titanium alloy part may be obtained after being cooled.
[31] Embodiment 3: Method of indirectly printing titanium alloy part with low-cost hydrogenated dehydrogenation titanium alloy powder mixed with spherical titanium alloy powder
[32] Hydrogenated dehydrogenation TC4 (Ti-6Al-4V) titanium alloy powder accounting for 83.2% of the total weight of the mixed powder, atomized spherical
Ti-6Al-4V titanium alloy powder accounting for 15% of the total weight of the mixed powder, yttrium element powder accounting for 1.8% of the total weight of the mixed powder and a binder accounting for 45% of the total volume of the feed are put into a
Sigma powder mixer, it is stirred and mixed for 6 h at a temperature of 170°C, and the binder is prepared by the following raw materials in parts by weight: 55 parts of a polyethylene polymer, 55 parts of a paraffin wax, and 5 parts of a stearic acid; and the use of 15wt.% spherical titanium alloy powder is beneficial to increase the loading capacity of metallic powder in the granular feed and wire material, and promote the sintering and densification of titanium alloy parts, and is a sintering aiding method. It is prepared into a granular feed with a diameter of less than 5 mm by using a granulator. 4
An injection molding machine is used, to manufacture an indirect printing wire feed, LU501912 and wherein the temperature of an injection nozzle is 150°C. Then a wire material with a diameter of 2 mm is obtained, and the wire material is loaded on a conventional plastic 3D printer, the temperature of a print nozzle is 170°C, and it is imported into a plastic printer according to computer modeling, to print a green body. The printed green body is placed in a hexane solvent, and kept at 60°C for 20 h. After being dried for 90 min, it is put in a degreasing sintering retort furnace, slowly heated to 680°C, and an argon stream is fed at the same time, to perform thermal degreasing. Subsequently, the vacuum degree of the degreasing sintering retort furnace is adjusted to 10-6 mbar, a degreasing blank is sintered, the sintering temperature is 1400°C, and the sintering time is 4 h. The indirect printed titanium alloy part may be obtained after being cooled.
[33] Embodiment 4: Method of indirectly printing titanium alloy part with low-cost hydrogenated dehydrogenation pre-alloyed powder
[34] Hydrogenated dehydrogenation pre-alloyed powder (about 0.8wt.% of an yttrium element is added to a titanium alloy during the ingot metallurgical process, and then the pre-alloyed powder is prepared by a hydrogenated dehydrogenation mechanical pulverization power preparation method) and a binder accounting for 45% of the total volume of the feed are put into a Sigma powder mixer, it is stirred and mixed for 7 h at a temperature of 170°C, and the binder is prepared by the following raw materials in parts by weight: 50 parts of a polyethylene polymer, 45 parts of a paraffin wax, and 5 parts of a stearic acid; and
[35] itis prepared into a granular feed with a diameter of less than 5 mm by using a granulator. An injection molding machine is used, to manufacture an indirect printing wire feed, and wherein the temperature of an injection nozzle is 170°C. Then a wire material with a diameter of 2 mm is obtained, and the wire material is loaded on a conventional plastic 3D printer, the temperature of a print nozzle is 170°C, and it is imported into a plastic printer according to computer modeling, to print a green body.
The printed green body is placed in a hexane solvent, and kept at 60°C for 20 h. After being dried for 90 min, it is put in a degreasing sintering retort furnace, slowly heated to 680°C, and an argon stream is fed at the same time, to perform thermal degreasing.
Subsequently, the vacuum degree of the degreasing sintering retort furnace is adjusted to 10-6 mbar, a degreasing blank is sintered, the sintering temperature is 1450°C, and the sintering time is 6 h. The indirect printed titanium alloy part may be obtained after being cooled.
[36] Embodiment 5: Method of indirectly printing titanium alloy part with low-cost hydrogenated dehydrogenation titanium powder and intermediate alloy powder
[37] Hydrogenated dehydrogenation titanium powder accounting for 89.5% of the total weight of the mixed powder, intermediate alloy powder (60AI-40V) accounting for 10% of the total weight of the mixed powder, yttrium element powder accounting for 0.5% of the total weight of the mixed powder and a binder accounting for 25% of the total volume of the feed are put into a Sigma powder mixer, it is stirred and mixed for 2 h at a temperature of 110°C. The binder is prepared by the following raw materials in parts by weight: 45 parts of a polyethylene polymer, 45 parts of a paraffin wax, and 4 parts of a stearic acid; and it is prepared into a granular feed with a diameter of less than mm by using a granulator. An injection molding machine is used, to manufacture an LU501912 indirect printing wire feed, and wherein the temperature of an injection nozzle is 110°C.
Then a wire material with a diameter of 2 mm is obtained, and the wire material is loaded on a conventional plastic 3D printer, the temperature of a print nozzle is 110°C, and it is imported into a plastic printer according to computer modeling, to print a green body. The printed green body is placed in a hexane solvent, and kept at 40°C for 5 h.
After being dried for 30 min, it is put in a degreasing sintering retort furnace, slowly heated to 550°C, and an argon stream is fed at the same time, to perform thermal degreasing. Subsequently, the vacuum degree of the degreasing sintering retort furnace is adjusted to 10-6 mbar, a degreasing blank is sintered, the sintering temperature is 1350°C, and the sintering time is 4 h. The indirect printed titanium alloy part may be obtained after being cooled.
[38] Embodiment 6: On the basis of Embodiment 1, the weight of the spherical pure titanium powder is increased to 99.8% of the total weight of the mixed powder, the hydrogenated dehydrogenation titanium powder is not used, and the others remain unchanged.
[39] In the above embodiments, the maximum particle size of the yttrium element powder, the yttrium element-containing intermediate alloy powder or the yttrium compound ceramic powder is 15 um, 40 um, or 63 um.
[40] In the above embodiments, the flow rate of the hexane solution is 0 ~20 cm/s, and the flow rate of the argon gas is 100~200 L/h.
[41] The above embodiments of the present invention are only examples for clearly describing the present invention, rather than limiting implementation modes of the present invention. Any variations or changes made in any form that belong to technical schemes of the present invention apparently are still within the scope of protection of the present invention. 6
Claims (2)
1. A low-cost titanium alloy indirect additive manufacturing method, characterized by comprising the following steps:
S1. power mixing: fully mixing, stirring and heating spherical powder and/or titanium or titanium alloy powder doped with irregular shapes with a binder, wherein the powder contains a yttrium element which is 0.2~1.8% of the total weight of the mixed powder, the addition amount of the binder accounts for 25~45% of the total volume of the mixed powder, and the binder is prepared by the following raw materials in parts by weight: 45~55 parts of a polyethylene polymer, 45~55 parts of a paraffin wax, and 4~5 parts of a stearic acid;
S2. granulating and wire making: after cooling the powder to be mixed and stirred, preparing it into a granular feed by a granulator or a crusher, and then using an injection molding machine or a wire making machine to process the granular feed into a titanium alloy wire material for indirect additive manufacturing;
S3. wire printing: loading the titanium alloy wire material on a conventional plastic 3D printer, and printing a titanium alloy green body by the 3D printer according to a three-dimensional modeling program in a computer;
S4. solvent degreasing: putting the green body into a solvent degreasing device or a container, and performing the solvent degreasing in a strong non-polar solvent with a certain flow rate, to remove a part of the binder; thermal degreasing: drying the solvent-degreased green body, putting it into a degreasing sintering retort furnace, slowly heating in an argon gas with a certain flow rate, and removing the remaining binder by a thermal degreasing method; and SS sintering: consolidating the titanium alloy green body with two-step degreasing and binder removal by a high-temperature pressureless sintering method, and after cooling it to a room temperature, acquiring a highly dense titanium alloy indirect printed product.
2. The low-cost titanium alloy indirect additive manufacturing method as claimed in claim 1, characterized in that in the step S1, the spherical powder and/or titanium or titanium alloy powder doped with the irregular shapes comprises: plasma atomized powder, electron beam atomized powder, gas atomized powder, rotary electrode powder, hydrogenated dehydrogenation powder, hydrogenation powder and/or mechanical grinding powder. 1
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