CN109226773A - Hollow bolted node sphere of titanium alloy and preparation method thereof - Google Patents
Hollow bolted node sphere of titanium alloy and preparation method thereof Download PDFInfo
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- CN109226773A CN109226773A CN201810950399.8A CN201810950399A CN109226773A CN 109226773 A CN109226773 A CN 109226773A CN 201810950399 A CN201810950399 A CN 201810950399A CN 109226773 A CN109226773 A CN 109226773A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 58
- 238000005238 degreasing Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000005476 soldering Methods 0.000 claims abstract description 20
- 238000001746 injection moulding Methods 0.000 claims abstract description 15
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 13
- 230000001788 irregular Effects 0.000 claims abstract description 10
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 8
- 229910000883 Ti6Al4V Inorganic materials 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000000853 adhesive Substances 0.000 claims abstract description 3
- 230000001070 adhesive effect Effects 0.000 claims abstract description 3
- 239000011812 mixed powder Substances 0.000 claims abstract 2
- 238000005245 sintering Methods 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 31
- 239000007924 injection Substances 0.000 claims description 31
- 238000010792 warming Methods 0.000 claims description 22
- 229920001903 high density polyethylene Polymers 0.000 claims description 18
- 239000004700 high-density polyethylene Substances 0.000 claims description 18
- 239000000956 alloy Substances 0.000 claims description 15
- 239000011230 binding agent Substances 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- -1 polypropylene Polymers 0.000 claims description 11
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 9
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 9
- 229920006324 polyoxymethylene Polymers 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 239000008117 stearic acid Substances 0.000 claims description 9
- 239000004200 microcrystalline wax Substances 0.000 claims description 8
- 238000007171 acid catalysis Methods 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 2
- 238000000889 atomisation Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 6
- 229910017938 Cu—Sn—Ti Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 11
- PASCVNXEVINGGG-UHFFFAOYSA-N Mollic acid Natural products CC(CCC=C(C)C)C1CCC2(C)C3CCC4C(C)(C(O)CC(O)C45CC35CCC12C)C(=O)O PASCVNXEVINGGG-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 6
- 238000003754 machining Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000000280 densification Methods 0.000 description 5
- 238000001291 vacuum drying Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- 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
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- 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
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
-
- 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
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The present invention relates to hollow bolted node sphere of a kind of titanium alloy and preparation method thereof, the bulb diameter of hollow bolted node sphere is 40~60mm of Ф, and ball wall thickness is 2~10mm；Spherical uniform is distributed connector connecting hole, and connection axially bored line, which passes through the centre of sphere, and connecting hole inner wall is working face to be threaded connection or trip type of attachment.Preparation method, which includes the following steps: to design, is equipped with half spherical model of hollow node of limited step and pin hole in end face, to be atomized spherical shape Ti-6Al-4V and the irregular two kinds of titanium alloy mixed-powders of hydrogenation and dehydrogenization as raw material, using catalysis degreasing type adhesive, hollow node hemisphere blank is prepared by Powder Injection Molding Technology, by the hemisphere blank end face even application Cu-Sn-Ti soldering paste after degreasing, it is engaged to obtain complete node ball；It is made after being then sintered cooling.The hollow bolted node sphere of titanium alloy of this method preparation is at low cost, consistency is good, dimensional accuracy is high, and fine microstructures are uniform, excellent in mechanical performance.
Description
Technical field
The present invention relates to powder metallurgical technologies, in particular to hollow bolted node sphere of titanium alloy and preparation method thereof.
Background technique
With the fast development of Satellite Payloads technology, mobile communication, earth observation, data relaying, microwave remote sensing etc.
Satellite proposes spaceborne deployable structure enlargement requirement.Present many scientific research plans, such as space science plan, the earth
Scientific plan and mankind's universe exploration plan also require large-scale space structure, and large space structure is typically all to utilize
The mode of rail assembling is constructed, it is desirable that quality of materials is light, rigidity is light, highly reliable, stability is good, thus can in-orbit assembling
The research of hiperspace truss has become the key problem for solving large space structure.Truss structure and truss member can
Give full play to material property, be suitable for large span even super-span structure, have the function of extended capability is strong, structure efficiency is high,
The advantages that diversity.Space truss structure manufacture includes that truss member manufacture and hollow structure metal bolted node sphere manufacture, at present
The manufacturing technology of truss member is more mature, and the manufacture of hollow bolted node sphere research needs to be goed deep into.
Hollow bolted node sphere is used as node in grid structure, is the core key part of large-scale truss structure, can be used to
Three-dimensional force flow is transmitted, changes the internal force distribution in grid structure, directly influences the stability and reliability of truss structure.As
Spaceborne expandable truss structure, hollow bolted node sphere had not only required excellent structural strength, but also required whole light-weight design, and
Titanium alloy material meets this requirement well.Titanium alloy as a kind of important high temperature lightweight structural material, have low-density,
High specific strength and specific stiffness, excellent high temperature resistant and corrosion resistance, are widely used in aerospace manufacturing field.Node at present
Ball mostly uses traditional machining process, and since each axially bored line was centre of sphere spatial distribution, angle change is more, the angle of each hole location
Degree variation is complicated, and clamping will cause biggish resetting error to work in-process repeatedly, and machining accuracy is low.Separately have by node
A bolt hole is first made on ball, is packed into bolt in hole then to be further processed, but the method complex procedures, production effect
Rate is low, and production cost is higher.In addition, structure is complicated for the ball interior of hollow bolted node sphere, internal material is difficult to remove.Another party
The machinability of face titanium alloy material itself is poor, and processing cost is higher, further limits conventional machining techniques in titanium
Application on alloy hollow bolted node sphere.Therefore, how to realize bolted node sphere hollow structure manufacture, reduce machining process at
For the key solved the problems, such as.
Powder Injection Molding Technology is the novel nearly end for combining powder metallurgy with injection molding technology and being formed
Forming technique can prepare the components with three-dimensional complex shapes with mass, realize hollow structure manufacture, effectively control wall
Thickness, directly prepare have or close to final shape part, machining process is reduced, to realize titanium alloy hollow bolted node sphere
Manufacture provides new approaches.
Summary of the invention
The purpose of the present invention is in order to solve the above problem, the present invention provide the hollow bolted node sphere of large-scale truss titanium alloy and its
Inexpensive mass preparation method.
According to an aspect of the present invention, a kind of hollow bolted node sphere of titanium alloy is provided, the hollow bolted node sphere of titanium alloy is with powder
It is that raw material passes through injection moulding and is prepared after being sintered, the bulb diameter of hollow bolted node sphere is 40~60mm of Ф, ball wall thickness is 2~
10mm；Spherical surface is distributed connector connecting hole, and connection bore dia is 4~12mm of Ф, and connection hole number is 4~18 holes, connects hole location
At 45 ° of top dome, ball bottom, 45 ° of circumference of the equatorial plane and/or south latitude and north latitude circumference, and it is uniformly distributed；Connection axially bored line passes through
The centre of sphere, connecting hole inner wall are working face, for threaded connection or trip type of attachment.
It wherein, when a threaded connection is used, is M4-M10 internal screw thread, reach 8-12mm；It is connected when using trip
When, the outer aperture of connecting hole sets tolerance cone, and cone angle is 10 °~20 °, and locking cone is arranged in connecting hole inner orifice, and cone angle is 15 °~45 °.
Wherein, powder includes Ti-6Al-4V alloy powder and irregular hydrogenation and dehydrogenization powder.
Wherein, the mean particle size D of Ti-6Al-4V alloy powder and irregular hydrogenation and dehydrogenization powder50It is 10~40 μm, wherein
The content of irregular hydrogenation and dehydrogenization powder is the 0~50% of raw material powder.
Wherein, the identical the first and second two hollow node hemisphere blanks of shape are first prepared by injection moulding, each
The combination end face of hollow node hemisphere blank is equipped with step and pin hole, in the combination of two hollow node hemisphere blanks after degreasing
Even application soldering paste on end face, and by the step of the first hollow node hemisphere blank be inserted into the second hollow node hemisphere blank pin
Hole, the step of the second hollow node hemisphere blank is inserted into the pin hole of the first hollow node hemisphere blank, so that two hollow nodes
Hemisphere fastens, and then re-sinters and is prepared.
Wherein, the ingredient of soldering paste includes Cu-xSn-yTi, wherein Sn content x be 18~32wt.%, Ti content y be 5~
20wt.%.
According to the second aspect of the invention, the preparation method of the hollow bolted node sphere of the titanium alloy is provided, comprising the following steps:
Injection moulding mold is prepared, the shape of the mold matches with the hollow node semi-spherical shape.
Raw material powder and binder are uniformly kneaded, then is crushed and granular feeding is made.
Granular feeding is packed into injector, adjusts injection parameters, injects injection moulding mold, prepares the first and second skies
Heart node hemisphere blank.
Two hollow node hemisphere blanks are put into ungrease treatment in catalysis degreasing furnace.
By the end face even application soldering paste of two hemisphere blanks after degreasing, it is engaged to obtain complete hollow bolted node sphere base
Part.
Hollow bolted node sphere blank is put into sintering furnace and is sintered, can be prepared by hollow bolted node sphere after furnace cooling
Product.
Wherein, it is kneaded and is made in granular feeding step, melting temperature is 150~190 DEG C, and the time is 1~2h；
Wherein, binder is catalysis degreasing type adhesive, main component include polyformaldehyde, high density polyethylene (HDPE), polypropylene,
Microwax and stearic acid, wherein polyoxymethylene level is 78~88wt.%, and high density polyethylene (HDPE) content is 4~7wt.%, polypropylene
Content is 4~7wt.%, and microcrystalline wax content is 1~5wt.%, and stearic acid content is 0.5~3wt.%.
Wherein, injection is prepared in hollow node hemisphere blank step, and feeding is heated to 170~200 DEG C in injection process, note
50~100MPa of injection pressure, 40~90MPa of dwell pressure, 60~110 DEG C of mould temperature；
Wherein, in ungrease treatment step, skimming processes are nitric acid catalysis degreasing, and skimming temp is 80~125 DEG C, into sour speed
Rate is 0.8~1.5g/min, and degreasing time is 6~12h.
Wherein, it includes: that sintering process is under high purity inert gas protection or true that hollow bolted node sphere product step, which is made, in sintering
It is carried out under empty condition, wherein the vacuum degree of vacuum condition is 10-2~10-4Pa；Specific sintering process are as follows: from room temperature with 3~7 DEG C/
Min is warming up to 450~600 DEG C, and soaking time is 0.5~2h, carries out first stage sintering；900 are warming up to 3~7 DEG C/min
~1100 DEG C, 0.5~2h is kept the temperature, carries out second stage sintering；1200~1350 DEG C of sintering temperature are warming up to 1~3 DEG C/min,
Soaking time is 1~4h, carries out phase III sintering.
In the present invention, use Ti-6Al-4V alloy powder for raw material, mean particle size D50It is 10~40 μm, is by atomization ball
Shape alloy powder and the irregular alloy powder of HDH method preparation are uniformly mixed, and wherein the content of HDH powder is 0~50%.
Spherical powder specific surface area is small, good fluidity, is conducive to the rheological characteristic and viscosity that improve feeding, improves powder loading；And add
Add irregular HDH powder can increase injection base conformality and intensity, may advantageously facilitate sintering densification, and reduce raw material at
This.Confirmed through research, can be too low due to powder loading when HDH content of powder is more than 50%, injection base sintering shrinkage greatly and
So that deformation is not easy to control, it is difficult to keep higher dimensional accuracy.And work as average particle size and limiting other than range, easily burn
The difficult phenomenon of knot densification.
Using catalysis degreasing type bonding agent, base intensity height is injected, degreasing speed is fast, temperature is low, deformation is small, oxygen increasing is easy to control
System prepares thicker part in lower range, and uniformity is more preferable.It, can be appropriate according to the content of the thickness of bolted node sphere, HDH powder
Binder system ingredient is adjusted, and formulates corresponding degreasing process.Mainly have during catalysis degreasing into mollic acid, degreasing temperature
The key process parameters such as degree, degreasing time.It is too small into mollic acid, skimming temp is too low will lead to except above-mentioned restriction range
Debinding rate is too low, and will increase equipment safety hidden danger into mollic acid is excessive, and skimming temp is excessively high, can also catalysis degreasing be made to react
It is too fast, degreasing defect is also easy to produce in green body.It is verified by experiments, reasonable skimming temp range is 80~125 DEG C, is into mollic acid
0.8~1.5g/min, degreasing time are 6~12h.
Binder and material powder are kneaded, feeding progress injection moulding are made, the use of injection temperature is 170~200 DEG C,
Injection pressure be 50~100MPa, 40~90MPa of dwell pressure, 60~110 DEG C of mould temperature.Injection temperature of the present invention selection 170~
200 DEG C, if injection temperature is too low, feeding illiquidity, and temperature is too high, will be easy to produce powder and binder two-phase point
From.Complex-shaped due to bolted node sphere blank, quality is larger, therefore to select biggish injection pressure to guarantee to fill type completely.
As injection pressure increases, injection base density increases, and tends to maximum value, but pressure is excessive, and residual stress increases, and is easy to cause
The defects of blank deforms, crackle；In order to effectively discharge injection base internal stress, dwell pressure will be lower than injection pressure to mention
The quality of high shaped blanks.Mold temperature equally influences very big, the too low meeting of temperature to the internal performance of injection base and apparent mass
Increase the feeding viscosity of injection, occur shorting with the injection defects such as hole, and temperature is excessively high when will cause die sinking that blank does not have
Enough intensity and hardness cause the adhesion of cavity surface and blank.By theory analysis and experiment, after finally obtaining optimization
Injection parameters can obtain that surface quality is good, the high injection moulding bolted node sphere sample of blank intensity.
Bolted node sphere is made by the node hemisphere Diffusion Welding after injection, and principle is by the material table to contact with each other
Face coating makes that phase counterdiffusion occurs between contact surface atom under the action of temperature and gravity, in interface compared with low melting point soldering paste
New diffusion layer is formed, is reliably connected to realize.To the Ti-6Al-4V material that the present invention uses, design coating low melting point Cu-
XSn-yTi activity soldering paste makes the fusion temperature of soldering paste between 900~1100 DEG C, is being sintered by adjusting Sn and Ti constituent content
Easily with matrix diffusion reaction occurs for soldering paste in the process, and two node dome contact end faces is made to generate metallurgical bonding to obtain higher boundary
Face bond strength.And the present invention formulates at thermal debinding, Diffusion Welding and the densification sintering integration heat of bolted node sphere blank accordingly
Science and engineering skill: the hollow bolted node sphere blank of titanium alloy that soldering paste is engaged will be coated and be warming up to 450 from room temperature with the speed of 3~7 DEG C/min
~600 DEG C are the first sintering stage, this stage keeps the temperature 0.5~2h, correspond to the thermal debinding stage the de- injection base institute of acid is remaining high
Fusing point binder is totally removed；900~1100 DEG C are warming up to as the second sintering stage with 3~7 DEG C/min, this stage keeps the temperature 0.5
~2h corresponds to the Diffusion Welding stage；Finally 1200~1350 DEG C of sintering temperature are warming up to 1~3 DEG C/min to be sintered for third
Stage keeps the temperature 1~4h, the sintering densification stage corresponding to bolted node sphere blank.Experiment confirms that process above can get shape essence
Degree is high, inside is uniform and the node ball part of good mechanical properties.
The invention has the following advantages:
(1) the more existing stainless steel bolted node sphere of the hollow bolted node sphere of titanium alloy, density is greatly lowered, specific strength is higher；Relatively
In aluminum joints ball, strength and stiffness are significantly promoted, and can reduce hollow bolted node sphere wall thickness, it is easy to accomplish thin spherical joint
Preparation.
(2) Powder Injection Molding Technology is used, the nearly end form preparation of the hollow bolted node sphere of complicated shape titanium alloy is realized, compared with
Existing machining technique simple process, low for equipment requirements, stock utilization is high, and cost is greatly lowered, it is easy to accomplish hollow
It is prepared by the mass of bolted node sphere.
(3) Powder Injection Molding Technology is used, the consistency for obtaining product is good, dimensional accuracy is high, and even tissue is tiny, power
It is high to learn performance；Using the injection moulding scheme of node hemisphere, the limitation of design node ball internal structure complexity is reduced, note
The difficulty for penetrating shaping dies preparation reduces, and can increase substantially the yield rate of injection base.
(4) Cu-Sn-Ti isoreactivity solder is designed, powder granule sintering densification can be carried out in high-temperature sintering process
Meanwhile the high-intensitive Diffusion Welding of node hemisphere end face is completed, the integration preparation of hollow bolted node sphere, node can be realized with a low cost
Ball interface bond strength is high, and preparation process is more simple.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 shows the schematic diagram of the hollow node hemisphere of titanium alloy of embodiment according to the present invention；
Fig. 2 shows the alloy components of embodiment according to the present invention manufactured with the hollow bolted node sphere same process of titanium alloy
Room temperature tensile properties schematic diagram.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened is fully disclosed to those skilled in the art.
As shown in Figure 1, the hollow bolted node sphere of titanium alloy, including the hollow node hemisphere 1 of two titanium alloys, each titanium alloy are hollow
The end face of node hemisphere is equipped with step 110 and pin hole 120, wherein the step 110 of the hollow node hemisphere of the first titanium alloy is inserted into
The step 110 of the pin hole 120 of the hollow node hemisphere of second titanium alloy, the hollow node hemisphere of the second titanium alloy is inserted into the first titanium alloy
The pin hole 120 of hollow node hemisphere, so that the hollow node hemisphere of two titanium alloys fastens, the hollow node hemisphere of two titanium alloys
It removes and is additionally provided with soldering paste between step and the portion end surface of pin hole, the hollow node hemisphere of two titanium alloys is welded by soldering paste.
The raw material that the hollow node hemisphere of two titanium alloys is made includes raw material powder and binder, and raw material powder includes Ti-
6Al-4V alloy powder and irregular hydrogenation and dehydrogenization powder.Ti-6Al-4V alloy powder and irregular hydrogenation and dehydrogenization powder it is flat
Equal granularity D50It is 10~40 μm, wherein the content of irregular hydrogenation and dehydrogenization powder is the 0~50% of raw material powder.The ingredient of soldering paste
Including Cu-xSn-yTi, wherein Sn content x is 18~32wt.%, and Ti content y is 5~20wt.%.
The bulb diameter of hollow bolted node sphere is 40~60mm of Ф, and ball wall thickness is 2~10mm；Spherical surface is distributed connector connecting hole, even
Connecing bore dia is 4~12mm of Ф, and connection hole number is 4~18 holes, and alternative is located at top dome, ball bottom, the equatorial plane, Nan Wei
At 45 ° of circumference and north 45 ° of circumference of dimension, and it is uniformly distributed.Connection axially bored line passes through the centre of sphere, and connecting hole inner wall is working face, can
For threaded connection or trip type of attachment.It is M4-M10 internal screw thread, reach 8-12mm when being for example threadedly coupled；Trip
When connection, the outer aperture of connecting hole sets tolerance cone, and cone angle is 10 °~20 °, and connecting hole inner orifice is arranged locking cone, and cone angle is 15 °~
45°。
The hollow bolted node sphere of titanium alloy of the invention has specific preparation method, will pass through the shape of specific embodiment below
Formula is described further the preparation method of the hollow bolted node sphere of the titanium alloy.
Embodiment 1
The TC4 powder that the hydrogenation and dehydrogenization powder that raw material is 50% is mixed with atomized powder, median grain diameter are 27.2 μm, viscous with modeling base
Agent mixing is tied, binder includes 85wt.% polyformaldehyde, 5wt.% high density polyethylene (HDPE), 5wt.% polypropylene, 3wt.% microwax
With 2wt.% stearic acid.Melting temperature is 180 DEG C, time 1.5h, and completion to be mixed takes out feeding after being cooled to room temperature, then leads to
It crosses broken machine-cut and obtains granular feeding.Then feeding is put into injector after being heated to 185 DEG C and is injected, injection pressure
80MPa, dwell pressure 70MPa, prepare two identical hollow node hemisphere blanks by 80 DEG C of mould temperature.Two blanks are put into
In debinding furnace carry out nitric acid catalysis degreasing, skimming temp be 125 DEG C, into mollic acid be 1.3g/min, degreasing time 8h, then
The endface of one of hemisphere blank coats Cu-20Sn-15Ti soldering paste after degreasing, then two hemisphere are engaged to obtain completely
Bolted node sphere is put into vacuum drying oven and is sintered, vacuum degree 10-4Pa.Sintering process are as follows: 600 DEG C first are warming up to 7 DEG C/min,
Keep the temperature 1h；1000 DEG C then are warming up to 4 DEG C/min, keeps the temperature 2h；1300 DEG C are warming up to 2 DEG C/min again, keeps the temperature 2h, Zhi Housui
Furnace is cooled to room temperature, obtains bolted node sphere product.
Preparation and analysis:
(1) mold design: hollow node semiglobe is designed by 3D sculpting software, in the combination of bolted node sphere hemisphere
Limited step and pin hole are set at face to improve interface bond strength, according to half spherical model of design to make mold cavity.
(2) consistency and hardness analysis: the alloy consistency of preparation is 96.34%, Rockwell hardness 34.41HRC.
(3) Mechanics Performance Testing: as shown in Fig. 2, preparing alloy tensile exemplar using same process, its tension is strong after tested
Degree is 923.35MPa, yield strength 832.31MPa, elongation percentage 5.87%.
(4) dimensional accuracy is tested: each face of sphere is shunk uniformly, the sphere diameter of the hollow bolted node sphere after degreasing be Ф 59 ±
0.24mm, the sphere diameter of sintered bolted node sphere are 50 ± 0.56mm of Ф, and shrinking percentage is 15.25 ± 1.29%.
Embodiment 2
The TC4 powder that the hydrogenation and dehydrogenization powder that raw material is 30% is mixed with atomized powder, median grain diameter are 12.5 μm, viscous with modeling base
Agent mixing is tied, binder includes 82wt.% polyformaldehyde, 6wt.% high density polyethylene (HDPE), 7wt.% polypropylene, 2wt.% microwax
With 3wt.% stearic acid.Melting temperature is 190 DEG C, time 2h, and completion to be mixed takes out feeding after being cooled to room temperature, then passes through
Broken machine-cut obtains granular feeding.Then feeding is put into injector after being heated to 195 DEG C and is injected, injection pressure 90MPa,
Dwell pressure 85MPa, prepares two hollow bolted node sphere blanks by 110 DEG C of mould temperature.Two blanks are put into debinding furnace and carry out nitre
Acid catalysis degreasing, skimming temp are 125 DEG C, are 1.5g/min, degreasing time 8h into mollic acid, then in degreasing rear quarter base
The endface of part coats Cu-23Sn-12Ti soldering paste, then two hemisphere are engaged to obtain complete node ball, be put into vacuum drying oven into
Row sintering, vacuum degree 10-3Pa.Sintering process are as follows: be first warming up to 500 DEG C with 7 DEG C/min, keep the temperature 1h；Then with 5 DEG C/min liter
Temperature keeps the temperature 2h to 900 DEG C；1350 DEG C are warming up to 3 DEG C/min again, keeps the temperature 4h, furnace cooling later to room temperature obtains bolted node sphere
Product.
The consistency of bolted node sphere product is 96.52%, Rockwell hardness 34.67HRC；Tensile strength is 895.73MPa, is bent
Taking intensity is 813.56MPa, elongation percentage 3.07%；Each face of sphere is shunk uniformly, and the sphere diameter of the hollow bolted node sphere after degreasing is
59 ± 0.24mm of Ф, the sphere diameter of sintered bolted node sphere are 49 ± 0.56mm of Ф, and shrinking percentage is 16.95 ± 0.34%.
Embodiment 3
The TC4 powder that the hydrogenation and dehydrogenization powder that raw material is 20% is mixed with atomized powder, median grain diameter are 18.6 μm, viscous with modeling base
Agent mixing is tied, binder includes 88wt.% polyformaldehyde, 4wt.% high density polyethylene (HDPE), 4wt.% polypropylene, 3.5wt.% crystallite
Wax and 0.5wt.% stearic acid.Melting temperature is 140 DEG C, time 1h, and completion to be mixed takes out feeding after being cooled to room temperature, then
Granular feeding is obtained by broken machine-cut.Then feeding is put into injector after being heated to 145 DEG C and is injected, injection pressure
50MPa, dwell pressure 45MPa, prepare two hollow bolted node sphere blanks by 70 DEG C of mould temperature.Two blanks are put into debinding furnace
Nitric acid catalysis degreasing is carried out, it is 1.5g/min, degreasing time 12h, then in degreasing into mollic acid that skimming temp, which is 120 DEG C,
The endface of rear quarter blank coats Cu-17Sn-18Ti soldering paste, then hemisphere is engaged to obtain complete node ball, is put into vacuum drying oven
In be sintered, vacuum degree 10-3Pa.Sintering process are as follows: be first warming up to 500 DEG C with 5 DEG C/min, keep the temperature 2h；Then with 4 DEG C/
Min is warming up to 1100 DEG C, keeps the temperature 1h；1250 DEG C are warming up to 2 DEG C/min again, keeps the temperature 2h, furnace cooling later to room temperature obtains
Bolted node sphere product.
The consistency of bolted node sphere product is 95.16%, Rockwell hardness 33.47HRC；Tensile strength is 783.41MPa, is bent
Taking intensity is 709.67MPa, elongation percentage 1.67%；Each face of sphere is shunk uniformly, and the sphere diameter of the hollow bolted node sphere after degreasing is
59 ± 0.24mm of Ф, the sphere diameter of sintered bolted node sphere are 51 ± 0.36mm of Ф, and shrinking percentage is 13.56 ± 1.02%.
Embodiment 4
The TC4 powder that the hydrogenation and dehydrogenization powder that raw material is 40% is mixed with atomized powder, median grain diameter are 24.9 μm, viscous with modeling base
Agent mixing is tied, binder includes 82wt.% polyformaldehyde, 6wt.% high density polyethylene (HDPE), 5wt.% polypropylene, 5wt.% microwax
With 2wt.% stearic acid.Melting temperature is 170 DEG C, time 1.5h, and completion to be mixed takes out feeding after being cooled to room temperature, then leads to
It crosses broken machine-cut and obtains granular feeding.Then feeding is put into injector after being heated to 175 DEG C and is injected, injection pressure
70MPa, dwell pressure 60MPa, prepare two hollow bolted node sphere blanks by 80 DEG C of mould temperature.Two blanks are put into debinding furnace
Nitric acid catalysis degreasing is carried out, it is 1.0g/min, degreasing time 6h, then after degreasing into mollic acid that skimming temp, which is 120 DEG C,
The endface of hemisphere blank coats Cu-27Sn-8Ti soldering paste, then hemisphere is engaged to obtain complete node ball, be put into vacuum drying oven into
Row sintering, vacuum degree 10-2Pa.Sintering process are as follows: be first warming up to 450 DEG C with 6 DEG C/min, keep the temperature 2h；Then with 4 DEG C/min liter
Temperature keeps the temperature 1h to 1000 DEG C；1200 DEG C are warming up to 1 DEG C/min again, keeps the temperature 2h, furnace cooling later to room temperature obtains node
Ball product.
The consistency of bolted node sphere product is 94.96%, Rockwell hardness 32.78HRC；Tensile strength is 762.43MPa,
Yield strength is 698.31MPa, elongation percentage 1.65%；Each face of sphere is shunk uniformly, the sphere diameter of the hollow bolted node sphere after degreasing
Sphere diameter for 59 ± 0.24mm of Ф, sintered bolted node sphere is
52 ± 0.35mm of Ф, shrinking percentage are 11.86 ± 0.95%.
Embodiment 5
The TC4 powder that the hydrogenation and dehydrogenization powder that raw material is 10% is mixed with atomized powder, median grain diameter are 15.1 μm, viscous with modeling base
Agent mixing is tied, binder includes 78wt.% polyformaldehyde, 7wt.% high density polyethylene (HDPE), 7wt.% polypropylene, 5wt.% microwax
With 3wt.% stearic acid.Melting temperature is 190 DEG C, time 2h, and completion to be mixed takes out feeding after being cooled to room temperature, then passes through
Broken machine-cut obtains granular feeding.Then feeding is put into injector after being heated to 200 DEG C and is injected, injection pressure 80MPa,
Dwell pressure 75MPa, prepares two hollow bolted node sphere blanks by 110 DEG C of mould temperature.Two blanks are put into debinding furnace and carry out nitre
Acid catalysis degreasing, skimming temp are 80 DEG C, are 0.8g/min, degreasing time 6h into mollic acid, then in degreasing rear quarter base
The endface of part coats Cu-20Sn-15Ti soldering paste, then hemisphere is engaged to obtain complete node ball, is put into vacuum drying oven and is burnt
Knot, vacuum degree 10-4Pa.Sintering process are as follows: be first warming up to 500 DEG C with 7 DEG C/min, keep the temperature 2h；Then it is warming up to 3 DEG C/min
1200 DEG C, keep the temperature 2h；1300 DEG C are warming up to 2 DEG C/min again, keeps the temperature 3h, furnace cooling later to room temperature obtains bolted node sphere system
Part.
The consistency of bolted node sphere product is 95.87%, Rockwell hardness 34.12HRC；Tensile strength is 873.52MPa, is bent
Taking intensity is 775.11MPa, elongation percentage 3.38%；Each face of sphere is shunk uniformly, and the sphere diameter of the hollow bolted node sphere after degreasing is
59 ± 0.24mm of Ф, the sphere diameter of sintered bolted node sphere are 50 ± 0.63mm of Ф, and shrinking percentage is 15.25 ± 1.48%.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (10)
1. the hollow bolted node sphere of titanium alloy, which is characterized in that the hollow bolted node sphere of titanium alloy is using powder as raw material, by being injected into
It is prepared after shape and sintering, the bulb diameter of the hollow bolted node sphere is 40~60mm of Ф, and ball wall thickness is 2~10mm；Spherical surface point
Cloth connector connecting hole, connection bore dia be 4~12mm of Ф, connection hole number be 4~18 holes, the connecting hole be located at top dome,
At 45 ° of ball bottom, 45 ° of circumference of the equatorial plane and/or south latitude and north latitude circumference, and it is uniformly distributed；Connection axially bored line passes through the centre of sphere, even
Connecing hole inner wall is working face, for threaded connection or trip type of attachment.
2. the hollow bolted node sphere of titanium alloy as described in claim 1, which is characterized in that
It when a threaded connection is used, is M4-M10 internal screw thread, reach 8-12mm；When using trip connection, connecting hole
Outer aperture sets tolerance cone, and cone angle is 10 °~20 °, and locking cone is arranged in connecting hole inner orifice, and cone angle is 15 °~45 °.
3. the hollow bolted node sphere of titanium alloy as described in claim 1, which is characterized in that the raw material powder is Ti-6Al-4V
(TC4) alloy powder is the irregular powder group of the alloyed spherical powder by atomization preparation and the preparation of hydrogenation and dehydrogenization (HDH) method
At uniform mixed-powder.
4. the hollow bolted node sphere of titanium alloy as claimed in claim 3, which is characterized in that the mean particle size D 50 of raw material powder is 10
~40 μm, wherein the content of HDH raw material alloy powder is 0~50%.
5. the hollow bolted node sphere of titanium alloy as described in claim 1-4 any one, which is characterized in that first made by injection moulding
The identical the first and second two hollow node hemisphere blanks of standby shape, the combination end face of each hollow node hemisphere blank is all provided with
Have step and pin hole, after degreasing on the combination end face of two hollow node hemisphere blanks even application soldering paste, and by first sky
The step of heart node hemisphere blank is inserted into the pin hole of the second hollow node hemisphere blank, the step of the second hollow node hemisphere blank
Be inserted into the pin hole of the described first hollow node hemisphere blank so that two hollow node hemisphere fasten, then re-sinter preparation and
At.
6. the hollow bolted node sphere of titanium alloy as claimed in claim 5, which is characterized in that
The ingredient of soldering paste includes Cu-xSn-yTi, and wherein Sn content x is 18~32wt.%, and Ti content y is 5~20wt.%.
7. the preparation method of the hollow bolted node sphere of titanium alloy as described in claim 1~6 any one, which is characterized in that including
Following steps:
Injection moulding mold is prepared, the shape of the mold matches with the hollow node semi-spherical shape；
Raw material powder and binder are uniformly kneaded, then is crushed and granular feeding is made；
Granular feeding is packed into injector, injection parameters is adjusted, injects the injection moulding mold, prepares the first and second skies
Heart node hemisphere blank；
First and second hollow node hemisphere blanks are put into ungrease treatment in catalysis degreasing furnace；
By the end face even application soldering paste of two hemisphere blanks after degreasing, it is engaged to obtain complete hollow bolted node sphere blank；
Hollow bolted node sphere blank is put into sintering furnace and is sintered, can be prepared by hollow bolted node sphere system after furnace cooling
Part.
8. the preparation method of the hollow bolted node sphere of titanium alloy as claimed in claim 7, which is characterized in that granular feeding is made in mixing
In step, melting temperature is 150~190 DEG C, and the time is 1~2h；
Wherein, the binder be catalysis degreasing type adhesive, main component include polyformaldehyde, high density polyethylene (HDPE), polypropylene,
Microwax and stearic acid, wherein polyoxymethylene level is 78~88wt.%, and high density polyethylene (HDPE) content is 4~7wt.%, polypropylene
Content is 4~7wt.%, and microcrystalline wax content is 1~5wt.%, and stearic acid content is 0.5~3wt.%.
9. the preparation method of the hollow bolted node sphere of titanium alloy as claimed in claim 7, which is characterized in that
Wherein, injection is prepared in hollow node hemisphere blank step, and feeding is heated to 170~200 DEG C in injection process, injection pressure
Power be 50~100MPa, 40~90MPa of dwell pressure, 60~110 DEG C of mould temperature；
Wherein, in ungrease treatment step, skimming processes are nitric acid catalysis degreasing, and skimming temp is 80~125 DEG C, are into nitric acid amount
0.8~1.5g/min, degreasing time are 6~12h.
10. the preparation method of the hollow bolted node sphere of titanium alloy as claimed in claim 7, which is characterized in that hollow section is made in sintering
Penalty kick product step includes:
Sintering process carries out under high purity inert gas protection or under vacuum condition, wherein the vacuum degree of the vacuum condition is 10-2~10-4Pa；Specific sintering process are as follows: 450~600 DEG C are warming up to from room temperature with 3~7 DEG C/min, soaking time is 0.5~
2h carries out first stage sintering；900~1100 DEG C are warming up to 3~7 DEG C/min, keeps the temperature 0.5~2h, carries out second stage burning
Knot；1200~1350 DEG C of sintering temperature are warming up to 1~3 DEG C/min, soaking time is 1~4h, carries out phase III sintering.
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| CN110202157A (en) * | 2019-06-21 | 2019-09-06 | 王韬 | A kind of titanium alloy composite material and the method that titanium alloy fishing rod abnormity lead ring is prepared based on Powder Injection Molding Technology |
| CN110586936A (en) * | 2019-09-17 | 2019-12-20 | 西安理工大学 | Preparation method of 3D printing low-cost high-strength titanium alloy part |
| CN110923647A (en) * | 2019-11-28 | 2020-03-27 | 北京航空航天大学青岛研究院 | Dirac node sphere semimetal and preparation and application methods thereof |
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