CN106493371B - A kind of preparation method of compact metal flange porous metal tube - Google Patents
A kind of preparation method of compact metal flange porous metal tube Download PDFInfo
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- CN106493371B CN106493371B CN201611080724.7A CN201611080724A CN106493371B CN 106493371 B CN106493371 B CN 106493371B CN 201611080724 A CN201611080724 A CN 201611080724A CN 106493371 B CN106493371 B CN 106493371B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
- B22F7/004—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part
-
- 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
- B22F3/02—Compacting only
-
- 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
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
-
- 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
- B22F5/106—Tube or ring forms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of preparation methods of compact metal flange porous metal tube, the compact metal flange porous metal tube includes porous metals tube body, compact metal tube head and compact metal flange, compact metal tube head is arranged on one end of porous metals tube body, compact metal tube head and the joint face of porous metals tube body are ring inclined-plane, compact metal flange is mounted on compact metal tube head, and this method is：First, compact metal tube head and compact metal flange are processed；2nd, the compacting tool set intracavitary filling metal powder above compact metal tube head, green compact molding is carried out in cold isostatic press, obtains blank；3rd, blank is put into sintering mold, is sintered, and obtains compact metal flange porous metal tube.The problems such as metal tube that the present invention solves two kinds of structures of previous welded flange and flanged monoblock type is susceptible to fracture and commissure corrosion cracking in military service due to commissure stress concentration or material difference.
Description
Technical field
The invention belongs to porous metal material processing technique fields, and in particular to a kind of compact metal flange porous metal tube
Preparation method.
Background technology
Porous ceramic pipe as the porous filtering pipe applied earliest due to its good high temperature resistant, corrosion resistance,
There is wider application.But shaking property of heat resistanceheat resistant and compression shock intensity are poor in addition for the red brittleness of porous ceramic pipe itself, Wu Fabao
Its reliability in use is demonstrate,proved, this severely limits the development of porous ceramic pipe.In recent years, porous metal tube due to
Good temperature tolerance and excellent mechanical performance, while good toughness and thermal conductivity make it have good heat resistanceheat resistant, shock resistance,
In addition, porous metal tube also has good processing performance, the extensive concern of domestic and international researcher is caused.
At present, domestic porous metal tube is broadly divided into two kinds of structures, respectively welded flange structure (as shown in Figure 1) and band
Flange as a whole formula structure (as shown in Figure 2).Find in actual use, the porous metal tube of welded flange structure strong acid,
Under the corrosivity working condition such as high temperature, highly basic, the commissure stress concentration and material that are contacted due to porous metals with compact metal
The reasons such as the difference of structure, commissure are susceptible to corrosion and porous metals problems of crack.It is although flanged monolithic porous
Metal tube solves the problems, such as the weld defect of welded flange structure well, but the unstability of filter medium transmission rate and
Agitation of the filter medium in filtering tank so that card can occur continuously to collide in the flange section and filtering tank of screen pipe.Cause
There is no compact metal intensity high for porous structure strength of flange in flanged monolithic porous metal tube, so the method for porous structure
Orchid can generate fine cracks in continuous collision.These fine cracks can cause porous in the continuous scour process of filter medium
Metal tube is thoroughly broken at flange position.Therefore two kinds of structural porous metals of welded flange structure and flanged monolithic construction
Pipe is all difficult to the requirement for meeting modern industry service life.
Invention content
The technical problems to be solved by the invention are in view of the above shortcomings of the prior art, to provide a kind of compact metal
The preparation method of flange porous metal tube.The preparation method solves two kinds of structures of previous welded flange and flanged monoblock type
The problems such as metal film is susceptible to fracture, commissure corrosion cracking in military service due to commissure stress concentration and material difference,
It is connected by way of diffusion-sintering in compact metal tube head in porous metals tube body, enhances the intensity of connection, extend more
Service life of the mesoporous metal pipe in high temperature, high pressure and strong corrosive environment.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of compact metal flange porous metal tube
Preparation method, which is characterized in that the compact metal flange porous metal tube include porous metals tube body, compact metal tube head and
Compact metal flange, the compact metal tube head are arranged on one end of porous metals tube body, the compact metal tube head with it is porous
The joint face of metal tube is ring inclined-plane, and the compact metal flange is mounted on the compact metal tube head, described porous
Metal tube, compact metal tube head are identical with the material of compact metal flange, and this method includes the following steps：
Step 1: according to drawing requirement using compact metal material processing compact metal tube head and compact metal flange, institute
It is split structure or integral structure to state compact metal tube head and compact metal flange；
Step 2: when compact metal tube head and compact metal flange are split structure, compact metal tube head is placed in
In compacting tool set, when compact metal tube head and compact metal flange are an integral structure, then by compact metal tube head and densification
Metal flange is placed in compacting tool set, then the compacting tool set intracavitary filling metal powder above compact metal tube head, dress
It fills in metal powder and is placed on progress green compact molding in cold isostatic press, obtain blank；
Step 3: blank described in step 2 is put into sintering mold, and in sintering mold and the gap of blank
Place's filling ceramic packing, makes ceramic packing coat blank completely, is then sintered, it is porous to obtain compact metal flange
Metal tube.
A kind of preparation method of above-mentioned compact metal flange porous metal tube, which is characterized in that the porous metal tube
The material of body, compact metal tube head and compact metal flange is stainless steel, titanium, nickel, titanium alloy, nickel alloy or FeAl alloys.
A kind of preparation method of above-mentioned compact metal flange porous metal tube, which is characterized in that the porous metal tube
The porosity of body is 20%~40%.
The preparation method of above-mentioned a kind of compact metal flange porous metal tube, which is characterized in that golden described in step 2
The granularity for belonging to powder is 60 μm~120 μm.
The preparation method of above-mentioned a kind of compact metal flange porous metal tube, which is characterized in that pressed described in step 2
The molding pressure of base is 140 tons.
The preparation method of above-mentioned a kind of compact metal flange porous metal tube, which is characterized in that burnt described in step 3
The temperature of knot processing is 900 DEG C~1350 DEG C, and the time of the sintering processes is 1h~3h.
The preparation method of above-mentioned a kind of compact metal flange porous metal tube, which is characterized in that make pottery described in step 3
Porcelain filling is TiO2Ceramic packing, ZrO2Ceramic packing or Al2O3Ceramic packing.
Compared with the prior art, the present invention has the following advantages：
1st, preparation process flow of the present invention is simple, and low production cost, the requirement to production equipment is relatively low, suitable for extensive
Industrialized production.
2nd, method of the invention overcomes the metal film of two kinds of structures of welded flange in the prior art and flanged monoblock type
The problems such as being susceptible to fracture, commissure corrosion cracking due to commissure stress concentration and material difference in military service, passes through expansion
Dissipating the mode of sintering makes compact metal tube head be connect with porous metals tube body, enhances the intensity connected between the two, extends
Service life of the porous metal tube in high temperature, high pressure and strong corrosive environment.
3rd, the porosity of sintered porous metal tube of the present invention is 20%~40%, has good air transmission coefficient, and
And during applied to filtering fuel gas and dust, filter efficiency is up to more than 99%.
Technical scheme of the present invention is described in further detail below by drawings and examples.
Description of the drawings
Fig. 1 is the structure diagram of the porous metal tube of prior art weld flange arrangement.
Fig. 2 is the structure diagram of the porous metal tube of the flanged monolithic construction of the prior art.
Fig. 3 is the structure diagram of the compact metal flange porous metal tube of the embodiment of the present invention 1~3.
Fig. 4 is the structure diagram of the compact metal flange porous metal tube of the embodiment of the present invention 4.
Reference sign:
1-porous metals tube body；2-compact metal tube head；3-compact metal flange.
Specific embodiment
Embodiment 1
As shown in figure 3, the compact metal flange porous metal tube of the present embodiment includes porous metals tube body 1, compact metal
Tube head 2 and compact metal flange 3, the compact metal tube head 2 are arranged on one end of porous metals tube body 1, the compact metal
Tube head 2 and the joint face of porous metals tube body 1 are ring inclined-plane, and the compact metal flange 3 is mounted on the compact metal pipe
On first 2, the material of the porous metals tube body 1, compact metal tube head 2 and compact metal flange 3 is Monel400 alloys；
The method for preparing the compact metal flange porous metal tube includes the following steps：
Step 1: according to drawing requirement using Monel400 alloy materials processing compact metal tube head 2 and compact metal method
Orchid 3, the compact metal tube head 2 and compact metal flange 3 are an integral structure；
Step 2: compact metal tube head 2 and compact metal flange 3 are placed in compacting tool set, then in compact metal
The compacting tool set intracavitary filling Monel400 powder of 2 top of tube head, fills Monel400 powder and is placed in cold isostatic press
Green compact molding is carried out, obtains blank；The molding pressure of green compact is 140 tons；The granularity of the metal powder is 90 μm；
Step 3: blank described in step 2 is put into sintering mold, and in sintering mold and the gap of blank
Place's filling TiO2Ceramic packing makes TiO2Ceramic packing coats blank completely, is sintered under conditions of being then 1250 DEG C in temperature
2h is handled, obtains compact metal flange porous metal tube, the porosity of the porous metals tube body 1 is 33%.
It is surveyed according to the standard GB/T/T 5249-1985 measure of bubble sample aperture " permeability sintered metal materials, "
The maximum diameter of hole for obtaining compact metal flange porous metal tube manufactured in the present embodiment is 19 μm, relative permeability 110m3/
m2·h·kPa.According to international standard BS ISO 11155-2:2009 " air filters in passenger compartment " measure the present embodiment system
Standby compact metal flange porous metal tube may be up to 99.5% for the filter efficiency of fuel gas and dust of the grain size not less than 1.5 μm
More than.The tensile strength of the junction of compact metal flange porous metal tube manufactured in the present embodiment and flange is 43MPa, and same
Tensile strength at the welded flange porous metal tube same position of sample material and structure only has 24MPa, illustrates the present embodiment system
The tensile strength of standby compact metal flange porous metal tube is greatly improved.
Embodiment 2
As shown in figure 3, compact metal flange porous metal tube manufactured in the present embodiment includes porous metals tube body 1, densification
Metal tube head 2 and compact metal flange 3, the compact metal tube head 2 are arranged on one end of porous metals tube body 1, the densification
Metal tube head 2 and the joint face of porous metals tube body 1 are ring inclined-plane, and the compact metal flange 3 is mounted on the fine and close gold
Belonging on tube head 2, the material of the porous metals tube body 1, compact metal tube head 2 and compact metal flange 3 is 316L stainless steels,
The method for preparing the compact metal flange porous metal tube includes the following steps：
Step 1: according to drawing requirement using 316L stainless steel materials processing compact metal tube head 2 and compact metal flange
3, the compact metal tube head 2 and compact metal flange 3 are an integral structure；
Step 2: compact metal tube head 2 and compact metal flange 3 are placed in compacting tool set, then in compact metal
The compacting tool set intracavitary filling 316L powder of stainless steel of 2 top of tube head, fills 316L powder of stainless steel and is placed on isostatic cool pressing
Green compact molding is carried out in machine, obtains blank；Pressure is 140 tons；The granularity of the 316L powder of stainless steel is 63 μm.
Step 3: blank described in step 2 is put into sintering mold, and in sintering mold and the gap of blank
Place's filling ZrO2Ceramic packing makes ZrO2Ceramic packing coats blank completely, is sintered under conditions of being then 1270 DEG C in temperature
2h is handled, obtains compact metal flange porous metal tube；The porosity of the porous metals tube body 1 is 29%.
It is surveyed according to the standard GB/T/T 5249-1985 measure of bubble sample aperture " permeability sintered metal materials, "
The maximum diameter of hole for obtaining compact metal flange porous metal tube manufactured in the present embodiment is 16 μm, relative permeability 96m3/m2·
h·kPa.According to international standard BS ISO 11155-2:2009 " air filters in passenger compartment " measure manufactured in the present embodiment
Compact metal flange porous metal tube may be up to more than 99.5% for the filter efficiency of fuel gas and dust of the grain size not less than 1 μm.
The tensile strength of the junction of compact metal flange porous metal tube manufactured in the present embodiment and flange is 55MPa, and similary material
Tensile strength at the welded flange porous metal tube same position of matter and structure only has 28MPa, illustrates manufactured in the present embodiment
The tensile strength of compact metal flange porous metal tube is greatly improved.
Embodiment 3
As shown in figure 3, compact metal flange porous metal tube manufactured in the present embodiment includes porous metals tube body 1, densification
Metal tube head 2 and compact metal flange 3, the compact metal tube head 2 are arranged on one end of porous metals tube body 1, the densification
Metal tube head 2 and the joint face of porous metals tube body 1 are ring inclined-plane, and the compact metal flange 3 is mounted on the fine and close gold
Belong on tube head 2, the material of the porous metals tube body 1, compact metal tube head 2 and compact metal flange 3 is pure Ti, prepares institute
The method for stating compact metal flange porous metal tube includes the following steps：
Step 1: according to drawing requirement using pure Ti materials processing compact metal tube head 2 and compact metal flange 3, it is described
Compact metal tube head 2 and compact metal flange 3 are an integral structure；
Step 2: compact metal tube head 2 and compact metal flange 3 are placed in compacting tool set, then in compact metal
The compacting tool set intracavitary filling metal Ti powder of the top of tube head 2, fills metal Ti powder and is placed in cold isostatic press and carry out
Green compact is molded, and obtains blank；The granularity of the metal Ti powder is 60 μm；
Step 3: blank described in step 2 is put into sintering mold, and in sintering mold and the gap of blank
Place's filling ZrO2Ceramic packing makes ZrO2Ceramic packing coats blank completely, is sintered under conditions of being then 900 DEG C in temperature
3h is handled, obtains compact metal flange porous metal tube；The porosity of the porous metals tube body 1 is 26%.
It is surveyed according to the standard GB/T/T 5249-1985 measure of bubble sample aperture " permeability sintered metal materials, "
The maximum diameter of hole for obtaining compact metal flange porous metal tube manufactured in the present embodiment is 13 μm, relative permeability 20m3/m2·
h·kPa.According to international standard BS ISO 11155-2:2009 " air filters in passenger compartment " measure manufactured in the present embodiment
Compact metal flange porous metal tube may be up to more than 99% for the filter efficiency of fuel gas and dust of the grain size not less than 0.3 μm.
The tensile strength of the junction of compact metal flange porous metal tube manufactured in the present embodiment and flange is 43MPa, and similary material
Tensile strength at the welded flange porous metal tube same position of matter and structure only has 26MPa, illustrates manufactured in the present embodiment
The tensile strength of compact metal flange porous metal tube is greatly improved.
Embodiment 4
As shown in figure 4, the compact metal flange porous metal tube of the present embodiment includes porous metals tube body 1, compact metal
Tube head 2 and compact metal flange 3, the compact metal tube head 2 are arranged on one end of porous metals tube body 1, the compact metal
Tube head 2 and the joint face of porous metals tube body 1 are ring inclined-plane, and the compact metal flange 3 is mounted on the compact metal pipe
On first 2, the material of the porous metals tube body 1, compact metal tube head 2 and compact metal flange 3 is 316L stainless steels；It prepares
The method of the compact metal flange porous metal tube includes the following steps：
Step 1: according to drawing requirement using 316L stainless steel materials processing compact metal tube head 2 and compact metal flange
3, the compact metal tube head 2 and compact metal flange 3 are split structure；
Step 2: compact metal tube head 2 is placed in compacting tool set, the then pressing die above compact metal tube head 2
Have intracavitary filling 316L stainless steel metal powder, fill 316L stainless steel metal powder and be placed in cold isostatic press and pressed
Base is molded, and obtains blank；The granularity of the 316L stainless steels is 120 μm；
Step 3: blank described in step 2 is put into sintering mold, and in sintering mold and the gap of blank
Place's filling Al2O3Ceramic packing makes Al2O3Ceramic packing coats blank completely, is burnt under conditions of being then 1350 DEG C in temperature
Compact metal flange 3, finally by the way of welding with compact metal tube head 2 is connect, obtains compact metal by knot processing 1h again
Flange porous metal tube；The porosity of the porous metals tube body 1 is 36%.
It is surveyed according to the standard GB/T/T 5249-1985 measure of bubble sample aperture " permeability sintered metal materials, "
The maximum diameter of hole for obtaining compact metal flange porous metal tube manufactured in the present embodiment is 40 μm, relative permeability 120m3/
m2·h·kPa.According to international standard BS ISO 11155-2:2009 " air filters in passenger compartment " measure the present embodiment system
Standby compact metal flange porous metal tube for grain size not less than the filter efficiency of 20 μm of fuel gas and dust may be up to 99% with
On.The tensile strength of the junction of compact metal flange porous metal tube manufactured in the present embodiment and flange is 73MPa, and similary
Tensile strength at the welded flange porous metal tube same position of material and structure only has 52MPa, illustrates prepared by the present embodiment
The tensile strength of compact metal flange porous metal tube be greatly improved.
The above is only presently preferred embodiments of the present invention, not the present invention is imposed any restrictions.It is every according to invention skill
Any simple modification, change and equivalence change that art substantially makees above example, still fall within technical solution of the present invention
Protection domain in.
Claims (7)
- A kind of 1. preparation method of compact metal flange porous metal tube, which is characterized in that the compact metal flange porous metals Pipe includes porous metals tube body (1), compact metal tube head (2) and compact metal flange (3), and the compact metal tube head (2) sets It puts in one end of porous metals tube body (1), the compact metal tube head (2) and the joint face of porous metals tube body (1) are ring Inclined-plane, the compact metal flange (3) is on the compact metal tube head (2), the porous metals tube body (1), densification Metal tube head (2) is identical with the material of compact metal flange (3), and this method includes the following steps：Step 1: compact metal tube head (2) and compact metal flange (3) are processed using compact metal material according to drawing requirement, The compact metal tube head (2) and compact metal flange (3) are split structure or integral structure；Step 2: when compact metal tube head (2) and compact metal flange (3) are split structure, by compact metal tube head (2) It is placed in compacting tool set, when compact metal tube head (2) and compact metal flange (3) are an integral structure, then by compact metal Tube head (2) and compact metal flange (3) are placed in compacting tool set, then the compacting tool set above compact metal tube head (2) Intracavitary fills metal powder, fills metal powder and is placed on progress green compact molding in cold isostatic press, obtains blank；Step 3: blank described in step 2 is put into sintering mold, and filled out in the gap of sintering mold and blank Ceramic packing is filled, ceramic packing is made to coat the blank completely, is then sintered, after the sintering processes, When compact metal tube head (2) and compact metal flange (3) are an integral structure, compact metal flange porous metals are directly obtained Pipe, when compact metal tube head (2) and compact metal flange (3) are split structure, by welding compact metal flange (3) Compact metal flange porous metal tube is obtained after being connect with compact metal tube head (2).
- 2. the preparation method of a kind of compact metal flange porous metal tube according to claim 1, which is characterized in that described The material of porous metals tube body (1), compact metal tube head (2) and compact metal flange (3) is stainless steel, titanium, nickel, titanium conjunction Gold, nickel alloy or FeAl alloys.
- 3. the preparation method of a kind of compact metal flange porous metal tube according to claim 1, which is characterized in that described The porosity of porous metals tube body (1) is 20%~40%.
- A kind of 4. preparation method of compact metal flange porous metal tube according to claim 1, which is characterized in that step The granularity of metal powder described in two is 60 μm~120 μm.
- A kind of 5. preparation method of compact metal flange porous metal tube according to claim 1, which is characterized in that step The molding pressure of green compact described in two is 140 tons.
- A kind of 6. preparation method of compact metal flange porous metal tube according to claim 1, which is characterized in that step The temperature of sintering processes described in three is 900 DEG C~1350 DEG C, and the time of the sintering processes is 1h~3h.
- A kind of 7. preparation method of compact metal flange porous metal tube according to claim 1, which is characterized in that step Ceramic packing described in three is TiO2Ceramic packing, ZrO2Ceramic packing or Al2O3Ceramic packing.
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| US11998987B2 (en) * | 2017-12-05 | 2024-06-04 | Kennametal Inc. | Additive manufacturing techniques and applications thereof |
| CN111229058B (en) * | 2018-11-28 | 2021-09-14 | 南京舒宜汇科学仪器有限公司 | Preparation process of ceramic composite membrane with metal protective layer |
| WO2020198245A1 (en) | 2019-03-25 | 2020-10-01 | Kennametal Inc. | Additive manufacturing techniques and applications thereof |
| CN113714502B (en) * | 2021-09-08 | 2022-05-20 | 西北有色金属研究院 | Preparation method of tubular porous metal element with micro permeation flux |
| CN114905041A (en) * | 2022-07-19 | 2022-08-16 | 西部宝德科技股份有限公司 | Preparation method of external light type powder sintering porous element |
| CN115401201B (en) * | 2022-09-08 | 2024-04-05 | 广州赛隆增材制造有限责任公司 | Nickel-based alloy powder sintering filter pipe and preparation method thereof |
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| JP2836139B2 (en) * | 1989-11-21 | 1998-12-14 | 石川島播磨重工業株式会社 | Slip casting equipment |
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