CN105033260B - A kind of integral formation method of ultra-fine long thin-walled seamless metal pipe - Google Patents
A kind of integral formation method of ultra-fine long thin-walled seamless metal pipe Download PDFInfo
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Abstract
The invention discloses the integral formation method of a kind of ultra-fine long thin-walled seamless metal pipe, the method is: one, prepare mixture A, mixture B and mixture C；Two, the first blank, the second blank and the 3rd blank are prepared；Three, in the first blank, the 3rd blank and the second blank being sequentially placed into recipient and it is compacted successively, obtains extrusion billet, then use the mode of powder extrusion molding to be extruded continuously through tube extrusion mouth by extrusion billet, obtain metal tube green compact；Four, metal tube green compact are sintered, obtain ultra-fine long thin-walled seamless metal pipe.The present invention is applicable to prepare the ultra-fine long thin-walled seamless metal pipe of various metal material, the seamless metal pipe obtained is by metal compaction pipe and metal perforated pipe and is placed in metal transfer pipe seamless link between the two and forms, it is firmly combined with, good seal performance, mechanical strength is high, can meet in the various use environment high to helium leak rates requirement, and service life is long.
Description
Technical field
The invention belongs to metal tube preparing technical field, be specifically related to a kind of ultra-fine long thin-walled seamless metal
The integral formation method of pipe.
Background technology
Metal perforated pipe with special pore structure and excellent corrosion resistance, non-oxidizability, wearability,
The performances such as mechanical property (ductility and impact strength), nuclear industry, energy manufacture, petrochemical industry,
The function necks such as the filtration in the fields such as metal metallurgy smelting, exhaust-gas treatment, waste water control, separation, fluid distrbution
Territory is taken on important role.The most in the industrial production in order to increase filter area, improve to filter and divide
From efficiency, majority be metal perforated pipe is fabricated to an assembly or tube bank replace the most single metal
Antipriming pipe carries out filtering separation, identical with the most metal porous single pipe volume at assembly or tube bank cumulative volume
Under the conditions of, this just requires that the size that the metal perforated pipe in assembly or tube bank has relatively big L/D ratio is wanted
Ask, and owing to filtering the lifting of separation condition, also require that metal perforated pipe has the feature of thin-walled.
This is accomplished by reliable connecting mode and is combined by ultra-fine long thin-wall metal antipriming pipe.General employing
Be the making first completing ultra-fine long thin-wall metal antipriming pipe, the then access way to metal compaction pipe
It is designed, carries out the pattern welded the most again.The quality of welding directly determines the military service neck of element
Territory and use occasion.Typically, the occasion that butt welded seam consistency requirements is the highest, as gas/solid separation,
Use in the fields such as solid/liquid separation, owing to the material grains of required separation is relatively big, thus many to metal
Hole pipe and commissure performance requirement thereof are less.But in some harsh conditions such as gas gas separation occasion
Application, usually requires that the helium leak rates of black box is less than 10-9Pa·m3/ s, this is just to metal porous
Commissure performance requirement between pipe and metal compaction pipe is strict.Such as use metal perforated pipe as propping up
During the palladium-based composite membrane purifying hydrogen of support body, the compactness of metal perforated pipe and the commissure of fine and close pipe is wanted
Ask the strictest, it is desirable to helium leak rates as little as 10-10Pa·m3/ s magnitude.
Welding method conventional between common metal have vacuum brazing, arc welding, electrogas arc welding, Laser Welding,
Electron beam welderings etc., ultra-fine long thin-wall metal antipriming pipe welds with metal compaction pipe after having prepared again
Connect, the pore structure special due to metal perforated pipe and elongated dimensional requirement, welding process can be caused
Being difficult to operation complete, after welding, there is the hole that aperture more own than metal perforated pipe is the biggest in commissure,
The compactness degradation of welding line joint, this is to reliable under multiple occasions of metal porous tube bundle assembly
Usability creates adverse effect, particularly in some require harsh gas gas separation use occasion,
Do not reach the use requirement that operating mode enterprise is proposed at all, due to metal perforated pipe itself have special
Structure so that after using generally conventional method to weld with metal compaction pipe, the commissure after welding
The aperture bigger than metal perforated pipe itself often occur, helium leak rates can only achieve
10-3～10-5Pa·m3/ s, has no idea to meet application requirement at all.
Up to now, although the relevant report in terms of existing more metal solder, but be fine and close material mostly
Welding between material, affiliated research field is entirely different, and about metal perforated pipe and metal compaction pipe
Between integral seamless welding procedure and theoretical research, both at home and abroad temporarily without report, also have no that Patents is remembered
State.
Summary of the invention
The technical problem to be solved is for above-mentioned deficiency of the prior art, it is provided that one
Plant the integral formation method of ultra-fine long thin-walled seamless metal pipe, the method is reasonable in design, technique is simple,
Simple operating steps and the highest to equipment requirement, it is adaptable to prepare the ultra-fine long thin-walled of various metal material
Seamless metal pipe, the seamless metal pipe obtained is by metal compaction pipe and metal perforated pipe and is placed in both
Between metal transfer pipe seamless link form, be firmly combined with, good seal performance, mechanical strength is high,
Can meet in the various use environment high to helium leak rates requirement, and service life is long.
For solving above-mentioned technical problem, the technical solution used in the present invention is: a kind of ultra-fine long thin-wall seamless
The integral formation method of metal tube, it is characterised in that comprise the following steps:
Step one, plasticizer is mixed with metal dust A, obtain mixture A, by plasticizer
Mix with metal dust B, obtain mixture B, then by described for part mixture A and part
Described mixture B 1:(1 in mass ratio～3) mix, obtain mixture C；Described metal dust
A is identical with the material of described metal dust B, and the average grain diameter of described metal dust A is
20 μm～110 μm, the average grain diameter of described metal dust B is 30 μm～150 μm, described metal powder
The average grain diameter of end B is 10 μm～50 μm with the difference of the average grain diameter of described metal dust A；
Step 2, under preheating condition, it is squeezed into base by step one remains described mixture A, obtains
First blank, is squeezed into base by remaining described mixture B in step one under preheating condition, obtains
Two blanks, are squeezed into base by mixture C described in step one under preheating condition, obtain the 3rd blank；
The temperature of described preheating is 35 DEG C～45 DEG C；
Step 3, the first blank described in step 2, the 3rd blank and the second blank are sequentially placed into crowded
In pressure cylinder and it is compacted successively, obtains extrusion billet, then use the mode of powder extrusion molding by described
Extrusion billet is extruded continuously, obtains metal tube green compact；The pressure of described powder extrusion molding is
2T～10T, temperature is 35 DEG C～45 DEG C；
Step 4, under protective atmosphere, metal tube green compact described in step 3 is sintered,
To ultra-fine long thin-walled seamless metal pipe, the external diameter of described ultra-fine long thin-walled seamless metal pipe is
4mm～10mm, wall thickness is 0.2mm～1mm, the length of ultra-fine long thin-walled seamless metal pipe and external diameter
Ratio more than 3, the temperature of described sintering processes is the fusing point of metal dust A described in step one
0.75～0.9 times, the temperature retention time of sintering processes is 120min～180min.
The integral formation method of above-mentioned a kind of ultra-fine long thin-walled seamless metal pipe, it is characterised in that step
Plasticizer described in rapid one is (3～7) with the mass ratio of metal dust A: 50, described plasticizer and gold
The mass ratio belonging to powder B is (3～7): 50.
The integral formation method of above-mentioned a kind of ultra-fine long thin-walled seamless metal pipe, it is characterised in that step
The quality of mixture C described in rapid one is the 30%～50% of described mixture A mass.
The integral formation method of above-mentioned a kind of ultra-fine long thin-walled seamless metal pipe, it is characterised in that step
Plasticizer described in rapid one is paraffin, carboxymethylcellulose calcium, starch or resin.
The integral formation method of above-mentioned a kind of ultra-fine long thin-walled seamless metal pipe, it is characterised in that step
The pressure being compacted described first blank, the 3rd blank and the second blank in rapid three is 15T～30T.
The integral formation method of above-mentioned a kind of ultra-fine long thin-walled seamless metal pipe, it is characterised in that step
Metal dust A described in rapid one and metal dust B is powder of stainless steel, nickel powder, titanium valve, nickel
Base alloy powder or Fe-Al intermetallic compound powder.
The present invention compared with prior art has the advantage that
1, the present invention is reasonable in design, technique is simple, simple operating steps and the highest to equipment requirement,
Be applicable to prepare the ultra-fine long thin-walled seamless metal pipe of various metal material, the seamless metal pipe obtained by
Metal compaction pipe and metal perforated pipe and be placed in metal transfer pipe seamless link between the two and form,
Being firmly combined with, good seal performance, mechanical strength is high, can meet various high to helium leak rates requirement
Use environment in, and service life is long.
2, the seamless metal pipe that the present invention obtains is integral type structure, it is to avoid traditional welding method pair
Instrument or the rigors of operating condition, by designing filler mode cleverly, it is achieved that metal porous
Pipe and the seamless link of metal compaction pipe, metal tube commissure air-tightness after the conventional bonding technique of solution
It is difficult to ensure that a difficult problem, in the seamless metal pipe that the present invention obtains metal compaction pipe and metal perforated pipe by
Metal transfer pipe realizes strong bonded, and in metal tube, porous position is steady with fine and close position transition, and tool
There are good sealing property and machining intensity, it is adaptable to use and require that more stringent gas gas separates
Occasion.
3, the present invention is applied widely, it is possible to promote the ultra-fine long thin-walled being applicable to various metal material
In the preparation of seamless metal pipe, it is particularly suited for the high (helium of weld seam of consistency requirements at butt welded seam
Slip requires as little as 10-9～10-10Pa·m3/ s) occasion.
4, the present invention is by the metal dust A different to average grain diameter, material is identical and metal dust
B carries out reasonably combined, controls specific sintering processes temperature, it is achieved densified compared with fine grain powder
And between relatively coarse grain footpath powder particle, sinter the formation of neck, and by design metal transfer pipe, solve
Thicker diameter powders and compared with the fine grain problem that time powder sintered, shrinkage factor is inconsistent, it is to avoid sintering
Processing procedure interrupts a difficult problem for pipe, if the temperature of sintering processes is too high, and the overall densified nothing of metal tube
Porous part, temperature is too low then the most densified compared with fine grain powder part, it is impossible to obtains having and well connects
Connect the transition conduit of effect, so the temperature of sintering processes must strictly be controlled, relatively fine grain could be realized
Densified and the thicker diameter powders of powder forms porous material, solves metal compaction Guan Yujin further
The connectivity problem of genus polyporus pipe.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of extrusion billet in the present invention.
Fig. 2 is the structural representation of ultra-fine long thin-walled seamless metal pipe in the present invention.
Fig. 3 is that the SEM of ultra-fine long thin-walled seamless metal pipe longitudinal cross-section in the embodiment of the present invention 1 shines
Sheet.
Fig. 4 is metal compaction tube portion in ultra-fine long thin-walled seamless metal pipe in the embodiment of the present invention 1
SEM photograph.
Fig. 5 is metal transfer tube portion in ultra-fine long thin-walled seamless metal pipe in the embodiment of the present invention 1
SEM photograph.
Fig. 6 is metal porous tube portion in ultra-fine long thin-walled seamless metal pipe in the embodiment of the present invention 1
SEM photograph.
Description of reference numerals:
1 first blank；2 second blanks；3 the 3rd blanks；
4 recipients；5 metal compaction pipes；6 metal transfer pipes；
7 metal perforated pipes.
Detailed description of the invention
Embodiment 1
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 5:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 5:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:2 in mass ratio is mixed,
To mixture C；Described metal dust A and described metal dust B is 316L powder of stainless steel,
The average grain diameter of described metal dust A is 22 μm, and the average grain diameter of described metal dust B is 34 μm,
The quality of described mixture C is the 50% of described mixture A mass, and described plasticizer is paraffin；
Step 2 is as it is shown in figure 1, be 40 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 40 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 40 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 6T, and temperature is 40 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 25T；
Step 4, under high-purity argon gas (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 6mm, and wall thickness is 1mm, a length of 530mm, at described sintering
Temperature is the fusing point of metal dust A described in step one 0.77 times (1150 DEG C) of reason, sintering
The temperature retention time processed is 160min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 20mm by length
Metal compaction pipe 5, length is about 10mm metal transfer pipe 6 and length is about the metal of 500mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
From figure 3, it can be seen that use the ultra-fine length that the processing mode of line cutting is prepared along the present embodiment
The longitudinal direction of thin-walled seamless metal pipe is cut open, and under the Electronic Speculum that multiplication factor is 100, metal is can't see in scanning
The obvious boundary that antipriming pipe is connected with metal compaction pipe, illustrates that ultra-fine long thin-walled seamless metal pipe connects and causes
Close, air-tightness is good；Figure 4, it is seen that ultra-fine long thin-walled seamless metal prepared by the present embodiment
The metal compaction tube portion of pipe exists without obvious space, and sintered body is fine and close；From figure 5 it can be seen that
The body of the metal transfer tube portion of ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is by difference
The metal powder sintered of particle diameter forms, and still suffers from hole；From fig. 6 it can be seen that the present embodiment system
The metal porous tube portion of standby ultra-fine long thin-walled seamless metal pipe sinters between metallic particles neck grow
Well, hole there occurs nodularization, makes irregular duct become round and smooth, has good through hole
Structure.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 340.83MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
Embodiment 2
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 7:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 7:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:1 in mass ratio is mixed,
To mixture C；Described metal dust A and described metal dust B is nickel powder, described metal dust
The average grain diameter of A is 110 μm, and the average grain diameter of described metal dust B is 150 μm, described mixing
The quality of thing C is the 35% of described mixture A mass, and described plasticizer is paraffin；
Step 2 is as it is shown in figure 1, be 45 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 45 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 45 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 10T, and temperature is 35 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 30T；
Step 4, under high-purity argon gas (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 8mm, and wall thickness is 1mm, a length of 840mm, at described sintering
Temperature is the fusing point of metal dust A described in step one 0.75 times (1100 DEG C) of reason, sintering
The temperature retention time processed is 180min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 30mm by length
Metal compaction pipe 5, length is about 10mm metal transfer pipe 6 and length is about the metal of 800mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 247.36MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
Embodiment 3
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 6:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 6:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:3 in mass ratio is mixed,
To mixture C；Described metal dust A and described metal dust B is Fe-Al intermetallic compound
Powder, the average grain diameter of described metal dust A is 80 μm, the average grain diameter of described metal dust B
Being 130 μm, the quality of described mixture C is the 50% of described mixture A mass, described plasticising
Agent is carboxymethylcellulose calcium；
Step 2 is as it is shown in figure 1, be 35 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 35 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 35 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 2T, and temperature is 45 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 15T；
Step 4, under high-purity argon gas (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 4mm, and wall thickness is 0.6mm, a length of 645mm, described sintering
Temperature is the fusing point of metal dust A described in step one 0.85 times (1300 DEG C) processed, burn
The temperature retention time that knot processes is 150min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 30mm by length
Metal compaction pipe 5, length is about 15mm metal transfer pipe 6 and length is about the metal of 600mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine at 96.87MPa
Under the conditions of record the fracture of metal perforated pipe position, and other positions are the most unbroken, illustrate that this ultra-fine length is thin
Wall seamless metal tube has good sealing property and machining intensity.
Embodiment 4
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 7:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 7:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:2 in mass ratio is mixed, obtain
Mixture C；Described metal dust A and described metal dust B is NiCrAl Co-based alloy powder,
The average grain diameter of described metal dust A is 30 μm, and the average grain diameter of described metal dust B is 40 μm,
The quality of described mixture C is the 50% of described mixture A mass, and described plasticizer is starch；
Step 2 is as it is shown in figure 1, be 40 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 40 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 40 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 8T, and temperature is 40 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 25T；
Step 4, under high-purity hydrogen (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 6mm, and wall thickness is 1mm, a length of 530mm, at described sintering
Temperature is the fusing point of metal dust A described in step one 0.85 times (1200 DEG C) of reason, sintering
The temperature retention time processed is 180min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 30mm by length
Metal compaction pipe 5, length is about 15mm metal transfer pipe 6 and length is about the gold of 1000mm
Genus polyporus pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after process, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3
Arriving, metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 298.63MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
Embodiment 5
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 4:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 4:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:2 in mass ratio is mixed, obtain
Mixture C；Described metal dust A and described metal dust B is Inconel625 nickel-base alloy powder
End, the average grain diameter of described metal dust A is 38 μm, and the average grain diameter of described metal dust B is
52 μm, the quality of described mixture C is the 50% of described mixture A mass, and described plasticizer is
Resin；
Step 2 is as it is shown in figure 1, be 40 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 40 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 40 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 9T, and temperature is 35 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 25T；
Step 4, under high-purity hydrogen (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 6mm, and wall thickness is 1mm, a length of 530mm, at described sintering
Temperature is the fusing point of metal dust A described in step one 0.8 times (1130 DEG C) of reason, at sintering
The temperature retention time of reason is 120min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 20mm by length
Metal compaction pipe 5, length is about 10mm metal transfer pipe 6 and length is about the metal of 500mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 352.64MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
Embodiment 6
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 4:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 4:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:2 in mass ratio is mixed, obtain
Mixture C；Described metal dust A and described metal dust B is titanium valve, described metal dust A
Average grain diameter be 80 μm, the average grain diameter of described metal dust B is 106 μm, described mixture
The quality of C is the 50% of described mixture A mass, and described plasticizer is paraffin；
Step 2 is as it is shown in figure 1, be 38 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 38 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 38 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 10T, and temperature is 40 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 25T；
Step 4, under high-purity argon gas (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 6mm, and wall thickness is 1mm, a length of 530mm, at described sintering
Temperature is the fusing point of metal dust A described in step one 0.78 times (1320 DEG C) of reason, sintering
The temperature retention time processed is 130min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 20mm by length
Metal compaction pipe 5, length is about 10mm metal transfer pipe 6 and length is about the metal of 500mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 186.31MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
Embodiment 7
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 6:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 6:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:1 in mass ratio is mixed, obtain
Mixture C；Described metal dust A and described metal dust B is 316L powder of stainless steel, institute
The average grain diameter stating metal dust A is 75 μm, and the average grain diameter of described metal dust B is 100 μm,
The quality of described mixture C is the 50% of described mixture A mass, and described plasticizer is paraffin；
Step 2 is as it is shown in figure 1, be 42 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 42 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 42 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 8T, and temperature is 40 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 22T；
Step 4, under high-purity hydrogen (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 6mm, and wall thickness is 1mm, a length of 530mm, at described sintering
Temperature is the fusing point of metal dust A described in step one 0.88 times (1330 DEG C) of reason, sintering
The temperature retention time processed is 130min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 20mm by length
Metal compaction pipe 5, length is about 10mm metal transfer pipe 6 and length is about the metal of 500mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 249.86MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
Embodiment 8
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 6:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 6:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:2 in mass ratio is mixed, obtain
Mixture C；Described metal dust A and described metal dust B is 304 powder of stainless steel, described
The average grain diameter of metal dust A is 100 μm, and the average grain diameter of described metal dust B is 150 μm,
The quality of described mixture C is the 48% of described mixture A mass, and described plasticizer is paraffin；
Step 2 is as it is shown in figure 1, be 40 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 40 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 40 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 7T, and temperature is 35 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 20T；
Step 4, under high-purity hydrogen (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 6mm, and wall thickness is 1mm, a length of 530mm, at described sintering
Temperature is the fusing point of metal dust A described in step one 0.9 times (1380 DEG C) of reason, at sintering
The temperature retention time of reason is 145min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 20mm by length
Metal compaction pipe 5, length is about 10mm metal transfer pipe 6 and length is about the metal of 500mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 347.52MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
Embodiment 9
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 7:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 7:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:2 in mass ratio is mixed, obtain
Mixture C；Described metal dust A and described metal dust B is 316L powder of stainless steel, institute
The average grain diameter stating metal dust A is 70 μm, and the average grain diameter of described metal dust B is 100 μm,
The quality of described mixture C is the 40% of described mixture A mass, and described plasticizer is paraffin；
Step 2 is as it is shown in figure 1, be 40 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 40 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 40 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 8T, and temperature is 45 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 20T；
Step 4, under high-purity hydrogen (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 10mm, and wall thickness is 0.2mm, a length of 32mm, described sintering
Temperature is the fusing point of metal dust A described in step one 0.88 times (1330 DEG C) processed, burn
The temperature retention time that knot processes is 120min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 5mm by length
Metal compaction pipe 5, length be about 2mm metal transfer pipe 6 and length to be about the metal of 25mm many
Hole pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering processes
After obtain, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine at 98.73MPa
Under the conditions of record the fracture of metal perforated pipe position, and other positions are the most unbroken, illustrate that this ultra-fine length is thin
Wall seamless metal tube has good sealing property and machining intensity.
Embodiment 10
The present embodiment comprises the following steps:
Step one, plasticizer is mixed with metal dust A 5:50 in mass ratio, mixed
Thing A, mixes plasticizer with metal dust B 5:50 in mass ratio, obtains mixture B, so
After described for part mixture A and part described mixture B 1:1 in mass ratio is mixed, obtain
Mixture C；Described metal dust A and described metal dust B is 316L powder of stainless steel, institute
The average grain diameter stating metal dust A is 105 μm, and the average grain diameter of described metal dust B is 133 μm,
The quality of described mixture C is the 30% of described mixture A mass, and described plasticizer is resin；
Step 2 is as it is shown in figure 1, be 40 DEG C by remaining described mixture A in step one in temperature
Under the conditions of be squeezed into base, obtain the first blank 1, step one will remain described mixture B in temperature
It is squeezed into base under the conditions of being 40 DEG C, obtains the second blank 2, by mixture C described in step one in temperature
Degree is squeezed into base under the conditions of being 40 DEG C, obtains the 3rd blank 3；
Step 3, by the first blank the 1, the 3rd blank 3 and the second blank 2 described in step 2 successively
In being placed in recipient 4 and it is compacted successively, obtains extrusion billet, then use the side of powder extrusion molding
Described extrusion billet is extruded continuously by formula through tube extrusion mouth, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 7T, and temperature is 35 DEG C, is compacted described first blank the 1, the 3rd blank 3 and
The pressure of the second blank 2 is 18T；
Step 4, under high-purity hydrogen (quality purity is not less than 99.99%) atmosphere to step 3 in institute
Stating metal tube green compact to be sintered, obtain ultra-fine long thin-walled seamless metal pipe, described ultra-fine length is thin
The external diameter of wall seamless metal tube is 5mm, and wall thickness is 0.5mm, a length of 150mm, described sintering
Temperature is the fusing point of metal dust A described in step one 0.9 times (1350 DEG C) processed, sintering
The temperature retention time processed is 140min.
As in figure 2 it is shown, ultra-fine long thin-walled seamless metal pipe prepared by the present embodiment is about 15mm by length
Metal compaction pipe 5, length is about 5mm metal transfer pipe 6 and length is about the metal of 130mm
Antipriming pipe 7 forms, wherein metal compaction pipe 5 by the first blank 1 through powder extrusion molding and sintering
Obtaining after reason, metal transfer pipe 6 obtains after powder extrusion molding and sintering processes through the 3rd blank 3,
Metal perforated pipe 7 is obtained after powder extrusion molding and sintering processes by the second blank 2.
The ultra-fine long thin-walled seamless metal pipe obtaining the present embodiment carries out sealing pores, then uses helium
The air-tightness at mass-spectrometer leak detector detection metal transfer pipe position, result is that slip can reach
10-10Pa·m3/ s magnitude level, uses 30KNInstron5967 universal testing machine to exist
Record the fracture of metal perforated pipe position under the conditions of 137.36MPa, and other positions are the most unbroken, explanation
This ultra-fine long thin-walled seamless metal pipe has good sealing property and machining intensity.
The above, be only presently preferred embodiments of the present invention, not impose any restrictions the present invention, every
Any simple modification, change and equivalent structure above example made according to the technology of the present invention essence
Change, all still falls within the protection domain of technical solution of the present invention.
Claims (6)
1. the integral formation method of a ultra-fine long thin-walled seamless metal pipe, it is characterised in that include with
Lower step:
Step one, plasticizer is mixed with metal dust A, obtain mixture A, by plasticizer
Mix with metal dust B, obtain mixture B, then by described for part mixture A and part
Described mixture B 1:(1 in mass ratio～3) mix, obtain mixture C；Described metal dust
A is identical with the material of described metal dust B, and the average grain diameter of described metal dust A is
20 μm～110 μm, the average grain diameter of described metal dust B is 30 μm～150 μm, described metal powder
The average grain diameter of end B is 10 μm～50 μm with the difference of the average grain diameter of described metal dust A；
Step 2, under preheating condition, it is squeezed into base by step one remains described mixture A, obtains
First blank (1), is squeezed into base by remaining described mixture B in step one under preheating condition,
Obtain the second blank (2), mixture C described in step one be squeezed into base under preheating condition,
Obtain the 3rd blank (3)；The temperature of described preheating is 35 DEG C～45 DEG C；
Step 3, by the first blank (1) described in step 2, the 3rd blank (3) and the second blank
(2) in being sequentially placed into recipient (4) and it is compacted successively, obtains extrusion billet, then use powder
Described extrusion billet is extruded by the mode of plasticising extruding continuously, obtains metal tube green compact；Described powder increases
The pressure moulding extruding is 2T～10T, and temperature is 35 DEG C～45 DEG C；
Step 4, under protective atmosphere, metal tube green compact described in step 3 is sintered,
To ultra-fine long thin-walled seamless metal pipe, the external diameter of described ultra-fine long thin-walled seamless metal pipe is
4mm～10mm, wall thickness is 0.2mm～1mm, the length of ultra-fine long thin-walled seamless metal pipe and external diameter
Ratio more than 3, the temperature of described sintering processes is the fusing point of metal dust A described in step one
0.75～0.9 times, the temperature retention time of sintering processes is 120min～180min.
2. according to the one-body molded side of a kind of ultra-fine long thin-walled seamless metal pipe described in claim 1
Method, it is characterised in that plasticizer described in step one is (3～7) with the mass ratio of metal dust A: 50,
Described plasticizer is (3～7) with the mass ratio of metal dust B: 50.
3. according to the one-body molded side of a kind of ultra-fine long thin-walled seamless metal pipe described in claim 1
Method, it is characterised in that the quality of mixture C described in step one is described mixture A mass
30%～50%.
4. according to the one-body molded side of a kind of ultra-fine long thin-walled seamless metal pipe described in claim 1
Method, it is characterised in that plasticizer described in step one is paraffin, carboxymethylcellulose calcium, starch or tree
Fat.
5. according to the one-body molded side of a kind of ultra-fine long thin-walled seamless metal pipe described in claim 1
Method, it is characterised in that be compacted described first blank (1), the 3rd blank (3) and in step 3
The pressure of two blanks (2) is 15T～30T.
6. according to the one-body molded side of a kind of ultra-fine long thin-walled seamless metal pipe described in claim 1
Method, it is characterised in that metal dust A described in step one and metal dust B are stainless steel powder
End, nickel powder, titanium valve, Co-based alloy powder or Fe-Al intermetallic compound powder.
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| CN110408963A (en) * | 2019-07-29 | 2019-11-05 | 益阳市菲美特新材料有限公司 | A kind of porous metals screen casing and preparation method thereof |
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