CN111004942A - TiBw/Ti composite material with nano-network-like structure and preparation method thereof - Google Patents
TiBw/Ti composite material with nano-network-like structure and preparation method thereof Download PDFInfo
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- CN111004942A CN111004942A CN201911100810.3A CN201911100810A CN111004942A CN 111004942 A CN111004942 A CN 111004942A CN 201911100810 A CN201911100810 A CN 201911100810A CN 111004942 A CN111004942 A CN 111004942A
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- 239000002131 composite material Substances 0.000 title claims abstract description 93
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000010936 titanium Substances 0.000 claims abstract description 105
- 239000000843 powder Substances 0.000 claims abstract description 43
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000010146 3D printing Methods 0.000 claims abstract description 35
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 29
- 229910033181 TiB2 Inorganic materials 0.000 claims abstract description 18
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000007639 printing Methods 0.000 claims description 49
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 239000000758 substrate Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 18
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract 1
- 238000005242 forging Methods 0.000 description 12
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000000227 grinding Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000005498 polishing Methods 0.000 description 8
- 229910001069 Ti alloy Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011812 mixed powder Substances 0.000 description 5
- 238000009689 gas atomisation Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000000498 ball milling Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- 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
- B22F10/20—Direct sintering or melting
-
- B22F1/0003—
-
- 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
-
- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a TiBw/Ti composite material with a nano-network-shaped structure and a preparation method thereof, wherein the TiBw/Ti composite material comprises the following raw materials in percentage by mass: 1-3 wt.% of titanium diboride and 97-99 wt.% of sponge titanium, wherein the mass percent of the components is 100%. Firstly preparing TiBw/Ti composite powder, and then preparing the TiBw/Ti composite material with the nano-network-shaped structure by adopting 3D printing. The TiBw/Ti composite material prepared by the invention has the advantages that the reinforcing phase TiBw is distributed at the crystal boundary according to the nanometer size and forms a nanometer network structure with the matrix crystal grains, and the composite material has excellent mechanical property.
Description
Technical Field
The invention belongs to the field of titanium-based composite materials, and particularly relates to a TiBw/Ti composite material with a nano-network-shaped structure and a preparation method of the composite material.
Background
Titanium and titanium alloys are widely used in aerospace, marine, medical and other fields due to their low density, high specific strength, good corrosion resistance, strong creep resistance at high temperatures and good biocompatibility. However, due to the difficulty in extracting, melting and processing titanium, the production cost of titanium ingots is about 30 times that of ingots of the same quality, and if processed into aerospace parts, the cost is higher. Therefore, reducing the cost of titanium and titanium alloys is an important approach to further expand the application area and dosage of titanium.
In the current research of preparing titanium-based composite materials by adopting 3D printing technology, the preparation method of the mixed powder still adopts a mechanical mixing method, namely spherical titanium powder and a reinforcing phase such as TiB2And the mixed powder for 3D printing is obtained by mechanical mixing through a ball milling method, however, the mixed powder prepared by the mechanical mixing method has many problems, such as that the sphericity of the powder is damaged by ball milling mixing, the mixing is not uniform, the reaction is incomplete due to the agglomeration of a reinforcement body, the interface is not wet, other impurities are easily introduced, and the like, and more importantly, in the 3D printing preparation process, the titanium and the titanium alloy are difficult to obtain better mechanical properties in the aspect of 3D printing, so that the application of the 3D printing in the field of titanium and titanium alloys is limited.
Disclosure of Invention
The invention aims to provide a TiBw/Ti composite material with a nano network structure, which can solve the problems of limited improvement of the strength and obvious reduction of plasticity of the existing TiBw/Ti composite material through fine grain strengthening and grain boundary strengthening.
The technical scheme adopted by the invention comprises the following steps: a TiBw/Ti composite material with a nano-network-shaped structure is composed of the following raw materials in percentage by mass: 1-3 wt.% of titanium diboride and 97-99 wt.% of sponge titanium, wherein the sum of the mass percentages of the components is 100%.
The technical solution adopted by the invention is also characterized in that,
the TiBw/Ti composite material has a nano-network-shaped structure, the diameter of the TiBw is 2-5 nm, and the size of Ti crystal grains is 200-400 nm.
The second technical scheme adopted by the invention is a preparation method of a TiBw/Ti composite material with a nano network-like structure, which is implemented according to the following steps:
step 1: weighing raw materials and preparing TiBw/Ti composite powder
Respectively weighing 1-3 wt% of titanium diboride and 97-99 wt% of sponge titanium according to the mass percentage, wherein the sum of the mass percentages of the components is 100%, uniformly mixing the weighed titanium diboride and the weighed sponge titanium, and preparing TiBw/Ti composite powder;
step 2: preparation of TiBw/Ti composite material with nano-network-shaped structure
Step 2.1, 3D printing parameter setting
Selecting laser power of 150-300 w, scanning speed of 0.5-1.25 m/s, laser beam diameter of 35 μm, layer thickness L of 0.03mm, line width h of 0.05 mm;
step 2.2, 3D printing mode setting
The printing mode is set to be performed simultaneously in three printing modes, namely P1: bidirectional printing along the stretching direction, P2: printing bi-directionally perpendicular to the direction of stretching, P3: printing vertically and horizontally at 90 degrees;
step 2.3: cleaning the substrate, and carrying out sand blasting treatment on the substrate;
step 2.4: pouring the TiBw/Ti composite powder obtained in the step 1 into a powder storage chamber of 3D printing equipment, and performing powder paving test until the powder is uniformly paved on a substrate to a thickness of 0.03 mm;
step 2.5: closing the cabin door of the equipment, vacuumizing and introducing argon for protection;
step 2.6: and (3) introducing a required printing model, and starting equipment for printing to obtain the TiBw/Ti composite material with the nano network-shaped structure.
The second technical solution adopted by the present invention is further characterized in that,
in step 2.3, the material of the substrate is TC 4.
And 2.5, vacuumizing until the oxygen content in the equipment cavity is 1000-2000 ppm and the argon pressure is 5-10 bar.
In step 2.6, the scanning speed is 0.5-1.25 m/s, and the printing power is 100-300W.
The invention has the beneficial effects that: the TiBw/Ti composite powder can be directly used for preparing a TiB/Ti composite material by 3D printing or powder metallurgy without ball milling and mixing; the 3D printing technology adopted in the invention can prepare the TiBw/Ti composite material with a nano network-shaped structure and excellent performance by utilizing the rapid solidification process. Therefore, the invention has the advantages of simple process, high preparation efficiency, low cost, complex machinable shape, high precision, high utilization rate of raw materials and energy and suitability for large-scale industrial production, and the prepared TiBw/Ti composite material has a nano-network structure, controllable reinforcement size and excellent mechanical property.
Drawings
FIG. 1 is a photograph of a tensile sample of a TiBw/Ti composite material with a nano-network-like structure prepared by the present invention;
FIG. 2 is a transmission photograph of TiBw/Ti composite material with nano-network structure prepared by the present invention;
FIG. 3 is a graph showing the room temperature tensile properties of the TiBw/Ti composite material in three different printing modes.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a TiBw/Ti composite material with a nano network structure, which comprises the following raw materials in percentage by mass: 1-3 wt.% of titanium diboride and 97-99 wt.% of sponge titanium, wherein the mass percent of the components is 100%.
Wherein, the source of the B element is titanium diboride, and the Ti element is derived from titanium sponge. The prepared TiBw/Ti composite material has a nano-network-shaped structure, the diameter of the TiBw is 2-5 nm, and the grain size of Ti is 200-400 nm.
The specific parameters of the raw materials are shown in the table 1:
TABLE 1 original powder ingredient Table
A preparation method of a TiBw/Ti composite material with a nano-network structure is implemented according to the following steps:
step 1: weighing raw materials
1-3 wt% of titanium diboride and 97-99 wt% of sponge titanium are weighed according to the mass percentage, and the sum of the mass percentages of the components is 100%.
Step 2: preparation of TiBw/Ti composite powder
And (2) uniformly mixing the raw materials weighed in the step (1) to obtain mixed powder, pressing the mixed powder into a consumable electrode by using a hydraulic press, and smelting into a composite ingot through vacuum consumable melting, wherein the source of the B element is titanium diboride, and the source of the Ti element is sponge titanium. And (2) polishing and grinding the surface of the composite ingot, heating to 1000-1050 ℃, preserving heat for 2 hours, cogging and forging, polishing and grinding the surface, heating to 950 ℃, preserving heat for 2 hours, forging by using a radial forging machine, machining into a bar of the titanium-based composite material, and preparing the TiBw/Ti composite powder by using a crucible-free induction melting ultrasonic gas atomization method.
And step 3: preparation of TiBw/Ti composite material containing nano network-shaped tissue
Step 3.1: 3D printing parameter setting
The laser power selected by the 3D printing equipment is 150-300 w, the scanning speed is 0.5-1.25 m/s, the diameter of a laser beam is 35 mu m, and the thickness L of the layer is 0.03mm, and the width h of the line is 0.05 mm.
Step 3.2: 3D printing mode setting
The selected printing modes are three printing modes which are respectively carried out simultaneously, wherein the three printing modes are respectively P1: bidirectional printing along the stretching direction, P2: printing bi-directionally perpendicular to the direction of stretching, P3: 90 deg. cross print.
Step 3.3: and cleaning the substrate, and carrying out sand blasting treatment on the substrate.
Step 3.4: and (3) pouring the TiBw/Ti composite powder obtained in the step (2) into a powder storage chamber of 3D printing equipment, and performing powder paving test until the thickness of the powder uniformly paved on the substrate is 0.03 mm.
Step 3.5: and closing the equipment cabin door, starting vacuumizing until the oxygen content in the equipment cavity is 1000-2000 ppm, and introducing argon for protection, wherein the pressure of the argon is 5-10 bar.
Step 3.6: and (3) introducing a required printing model, starting equipment for printing, wherein the printing speed is 0.5-1.25 m/s, and the printing power is 100-250W, so that the TiBw/Ti composite material with the nano network-shaped structure is obtained, and as shown in figure 1, the TiBw/Ti composite material is a tensile sample photo of the TiBw/Ti composite material prepared by the method. The microstructure of the composite material is shown in FIG. 2, which is a transmission photograph of the composite material prepared by the invention, and the result shows that TiBw/Ti prepared by different powers and scanning speeds has a nano network structure, and the size of the network structure is 200-400 nm. Wherein the TiBw diameter is 2-5 nm, and the Ti grain size is 200-400 nm. Compared with the traditional similar composite material, the composite material has smaller grain size and a nano network structure, and has good tensile property and elongation rate through fine grain strengthening and grain boundary strengthening.
Example 1:
step 1: preparation of TiBw/Ti composite powder
Weighing 1 wt% of titanium diboride and 99 wt% of sponge titanium according to the mass percentage, wherein the sum of the mass percentages of the components is 100%, uniformly mixing the weighed components, pressing the mixture into a consumable electrode by using a hydraulic press, and smelting the consumable electrode into a composite ingot through vacuum consumable melting. Wherein, the source of the B element is titanium diboride, and the Ti element is derived from titanium sponge. And (2) polishing and grinding the surface of the composite ingot, heating to 1000-1050 ℃, preserving heat for 2 hours, cogging and forging, polishing and grinding the surface, heating to 950 ℃, preserving heat for 2 hours, forging by using a radial forging machine, machining into a bar of the titanium-based composite material, and preparing the TiBw/Ti composite powder by using a crucible-free induction melting ultrasonic gas atomization method.
Step 2: the method for preparing the TiBw/Ti composite material with the nano-network-shaped structure through 3D printing comprises the following specific steps:
step 2.1: 3D printing parameter setting
The laser power selected by the 3D printing equipment is 150W, the scanning speed is 0.5m/s, the diameter of a laser beam is 35 mu m, and the layer thickness L is 0.03mm, the line width h is 0.05 mm.
Step 2.2: 3D printing mode setting
Selecting P1, P2 and P3 printing modes to print simultaneously respectively;
step 2.3: the TC4 substrate was cleaned and the TC4 substrate was grit blasted.
Step 2.4: and (3) pouring the TiBw/Ti composite powder prepared in the step (1) into a powder storage chamber of a 3D printing device, and performing a powder paving test until the thickness of the powder uniformly paved on the substrate is 0.03 mm.
Step 2.5: and closing the equipment cabin door, starting vacuumizing until the oxygen content in the equipment cavity is 1000ppm, and introducing argon for protection, wherein the pressure of the argon is 5 bar.
Step 2.6: and starting the equipment for printing, wherein the printing speed is 0.5m/s, and the printing power is 150W, so that the TiBw/Ti composite material with the nano network-shaped structure is obtained.
Example 2
Step 1: preparation of TiBw/Ti composite powder
Weighing 2 wt% of titanium diboride and 98 wt% of sponge titanium according to the mass percentage, wherein the sum of the mass percentages of the components is 100%, uniformly mixing the weighed components, pressing the mixture into a consumable electrode by using a hydraulic press, and smelting the consumable electrode into a composite ingot through vacuum consumable melting. Wherein, the source of the B element is titanium diboride, and the Ti element is derived from titanium sponge. And (2) polishing and grinding the surface of the composite ingot, heating to 1000-1050 ℃, preserving heat for 2 hours, cogging and forging, polishing and grinding the surface, heating to 950 ℃, preserving heat for 2 hours, forging by using a radial forging machine, machining into a bar of the titanium-based composite material, and preparing the TiBw/Ti composite powder by using a crucible-free induction melting ultrasonic gas atomization method.
Step 2: the method for preparing the TiBw/Ti composite material with the nano-network-shaped structure through 3D printing comprises the following specific steps:
step 2.1: 3D printing parameter setting
The laser power selected by the 3D printing equipment is 200W, the scanning speed is 1.25m/s, the diameter of a laser beam is 35 mu m, and the layer thickness L is 0.03mm, the line width h is 0.05 mm.
Step 2.2: 3D printing mode setting
Selecting P1, P2 and P3 printing modes to print simultaneously respectively;
step 2.3: the TC4 substrate was cleaned and the TC4 substrate was grit blasted.
Step 2.4: and (3) pouring the TiBw/Ti composite powder prepared in the step (1) into a powder storage chamber of 3D printing equipment, and performing powder paving test until the thickness of the powder uniformly paved on the substrate is 0.03 mm.
Step 2.5: and closing the equipment cabin door, starting vacuumizing until the oxygen content in the equipment cavity is 1500ppm, and introducing argon for protection, wherein the pressure of the argon is 7 bar.
Step 2.6: and starting the equipment for printing, wherein the printing speed is 1.25m/s, and the printing power is 200W, so that the TiBw/Ti composite material with the nano network-shaped structure is obtained.
Example 3
Step 1: preparation of TiBw/Ti composite powder
3 wt% of titanium diboride and 97 wt% of sponge titanium are weighed according to the mass percentage, the sum of the mass percentages of the components is 100%, the weighed components are uniformly mixed and pressed into a consumable electrode by a hydraulic press, and the consumable electrode is smelted into a composite ingot through vacuum consumable melting. Wherein, the source of the B element is titanium diboride, and the Ti element is derived from titanium sponge. And (2) polishing and grinding the surface of the composite ingot, heating to 1000-1050 ℃, preserving heat for 2 hours, cogging and forging, polishing and grinding the surface, heating to 950 ℃, preserving heat for 2 hours, forging by using a radial forging machine, machining into a bar of the titanium-based composite material, and preparing the TiBw/Ti composite powder by using a crucible-free induction melting ultrasonic gas atomization method.
Step 2: the method for preparing the TiBw/Ti composite material with the nano-network-shaped structure through 3D printing comprises the following specific steps:
step 2.1: 3D printing parameter setting
The laser power selected by the 3D printing equipment is 300W, and the scanning speed is as follows: 1.0m/s, a laser beam diameter of 35 μm, a layer thickness L of 0.03mm and a line width h of 0.05 mm.
Step 2.2: 3D printing mode setting
Selecting P1, P2 and P3 printing modes to print simultaneously respectively;
step 2.3: the TC4 substrate was cleaned and the TC4 substrate was grit blasted.
Step 2.4: and pouring the TiBw/Ti composite powder into a powder storage chamber of 3D printing equipment, and carrying out powder paving test until the thickness of the powder uniformly paved on the substrate is 0.03 mm.
Step 2.5: and closing the equipment cabin door, starting vacuumizing until the oxygen content in the equipment cavity is 2000ppm, and introducing argon for protection, wherein the pressure of the argon is 10 bar.
Step 2.6: and starting the equipment for printing, wherein the printing speed is 1.0m/s, and the printing power is 300W, so that the TiBw/Ti composite material with the nano network-shaped structure is obtained.
Comparative example: pure titanium is taken as a comparative example and prepared in the same way, and the specific preparation steps are as follows:
firstly, setting the laser power of a 3D printing device to be 200W, the scanning speed to be 1.25m/s, the diameter of a laser beam to be 35 mu m, the thickness L to be 0.03mm, and the width h to be 0.05 mm; the selected printing mode is P1: bidirectional printing along the stretching direction, P2: printing bi-directionally perpendicular to the direction of stretching, P3: simultaneously printing in three modes of 90-degree longitudinal and transverse printing; the TC4 substrate was cleaned and the TC4 substrate was grit blasted. And pouring the pure titanium powder into a powder storage chamber of the 3D printing equipment, and carrying out a powder paving test until the thickness of the powder uniformly paved on the substrate is 0.03 mm. And closing the equipment cabin door, starting vacuumizing until the oxygen content in the equipment cavity is 1500ppm, and introducing argon for protection, wherein the pressure of the argon is 7 bar. And starting the equipment for printing, wherein the printing speed is 1.25m/s, and the printing power is 200W, so that the pure titanium material of the comparative example 1 is obtained.
The TiBw/Ti composite material with the nano-network-shaped structure can be obtained from the composite materials prepared in the embodiments 1-3, and through comparison, the composite material prepared in the embodiment 3 has good forming quality and optimal density, namely: the printing power was 200w and the scanning speed was 1.25m/s. The patent therefore performs a performance test on example 3 and comparative example 1.
The performance measurements were performed for example 3 and comparative example 1 above:
tensile samples of the materials prepared in example 3 and comparative example 1 were first polished and tested for tensile properties and elongation in a universal tester at a strain rate of 5X 10-4S until stretch breaking, and data is recorded and processed. The test results are shown in fig. 3, which is a tensile property curve of the composite material prepared by the invention, and the results show that: the tensile strength of the composite material corresponding to the printing mode P1 is 1011MPa, and the elongation can reach 6%. Compared with pure titanium, the tensile property of the titanium alloy is improved by 35 percent. P2 corresponds to a composite tensile strength of 831 MPa. The elongation was 11.4%. The P3 corresponds to a composite material with a tensile strength of 851MPa and an elongation of 11.2%. Therefore, the TiB/Ti composite material with the nano-network structure prepared by the invention better solves the problem of strength-plasticity/toughness matching of the titanium-based composite material, can realize the controllable preparation of the TiB/Ti composite material, and provides powerful technical support and theoretical reference for engineering application of the TiB/Ti composite material.
Claims (6)
1. A TiBw/Ti composite material with a nano-network structure is characterized by comprising the following raw materials in percentage by mass: 1-3 wt.% of titanium diboride and 97-99 wt.% of sponge titanium, wherein the sum of the mass percentages of the components is 100%.
2. The TiBw/Ti composite material with the nano-network structure of claim 1, wherein the TiBw/Ti composite material has a nano-network structure, the diameter of the TiBw is 2-5 nm, and the grain size of Ti is 200-400 nm.
3. A method for preparing the TiBw/Ti composite material with the nano-network structure as claimed in claim 1,
the method is implemented according to the following steps:
step 1: weighing raw materials and preparing TiBw/Ti composite powder
Respectively weighing 1-3 wt% of titanium diboride and 97-99 wt% of sponge titanium according to the mass percentage, wherein the sum of the mass percentages of the components is 100%, uniformly mixing the weighed titanium diboride and the weighed sponge titanium, and preparing TiBw/Ti composite powder;
step 2: preparation of TiBw/Ti composite material with nano-network-shaped structure
Step 2.1, 3D printing parameter setting
Selecting laser power of 150-300 w, scanning speed of 0.5-1.25 m/s, laser beam diameter of 35 μm, layer thickness L of 0.03mm, line width h of 0.05 mm;
step 2.2, 3D printing mode setting
Setting a printing mode to be simultaneously carried out by three printing modes, wherein the three printing modes are respectively P1: bidirectional printing along the stretching direction, P2: printing bi-directionally perpendicular to the direction of stretching, P3: printing vertically and horizontally at 90 degrees;
step 2.3: cleaning the substrate, and carrying out sand blasting treatment on the substrate;
step 2.4: pouring the TiBw/Ti composite powder obtained in the step 1 into a powder storage chamber of 3D printing equipment, and performing powder paving test until the powder is uniformly paved on a substrate to a thickness of 0.03 mm;
step 2.5: closing the cabin door of the equipment, vacuumizing and introducing argon for protection;
step 2.6: and (3) introducing a required printing model, and starting equipment for printing to obtain the TiBw/Ti composite material with the nano network-shaped structure.
4. The method for preparing the TiBw/Ti composite material with the nano-network structure as claimed in claim 3, wherein the substrate material in the step 2.3 is TC 4.
5. The method for preparing the TiBw/Ti composite material with the nano-network-like structure as claimed in claim 3, wherein in the step 2.5, vacuum pumping is performed until the oxygen content in the equipment cavity is 1000-2000 ppm, and the argon pressure is 5-10 bar.
6. The method for preparing the TiBw/Ti composite material with the nano-network-like structure as claimed in claim 3, wherein the scanning speed in the step 2.6 is 0.5-1.25 m/s, and the printing power is 100-300W.
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