JPH09137204A - Porous body metallic composite cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a porous body metallic composite cylinder applicable to various uses by forming hot isotropic pressure sintered bodies having pore distributions different from each other by respective layers in a metallic cylinder having a concentric multiple structure. SOLUTION: A porous body metallic composite cylinder 1 is composed in such a manner that metallic porous bodies 5, 6 and 7 composed of hot isotropic pressure sintered bodies are formed in metallic cylinders 2, 3 and 4 having a multiple structure such as a concentric tripple structure. Concretely, the metallic cylinders 2, 3 and 4 formed of corrosion resistant metals such a stainless steel, titanium, alloys or the like are arranged into the shape of a concentric circle, and in the above, the metallic porous bodies 5, 6 and 7 having desired porosity and prescribed pore size are formed. As the sintering raw material powder of the metallic porous bodies 5, 6 and 7, stainless steel series, tool steel series, maraging steel series, high speed steel series, nonferrous metal series or the like are used. The porosity and pore size in the metallic porous bodies are regulated with the raw material, pressurizing temp., pressurizing force and treating time as regulating factors. At the time of digging grooves 3a and 3b of plural strips on the inner and outer circumferences of the metallic cylinders 2 to 4, the adhesive strength of the porous metallic bodies 5 to 7 can be increased.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a porous metal composite cylinder applied to a mixer, a chemical reaction cylinder, a cutter, a filter, a metal catalyst, a soundproofing material, an impregnated metal and the like.

[0002]

2. Description of the Related Art A metal porous body is manufactured, for example, by a method in which a mixture of metal powder and stainless steel metal fibers is pressure-molded into a desired shape and then heated and sintered. Alternatively, it is produced by a method in which a binder, a solvent, etc. are added to metal powder to prepare a slurry, the binder, the solvent, etc. are removed by preliminary firing, and then sintering is performed by firing. In addition, as a method for producing a metal porous body as a multilayer porous body having a laminated structure composed of a plurality of layers having different pore distributions, a plurality of metal powders or metal fibers mixed with heat-dissipating fibers at different mixing ratios are used. A method has been proposed in which the molded body of (1) is pressure-molded, the molded bodies are laminated and heat-sintered (JP-A-63-171803).

[0003]

In the conventional method for producing a porous metal body, the raw material powder is pressure-molded and then the green body is sintered by pressureless sintering. Therefore, it is difficult to control the porosity, the pore size, and other pore characteristics of the porous metal body. Further, it is difficult to secure the strength in the case of a porous body produced by mixing a molding binder, and it is not easy to secure the bonding strength at the product-metal interface in a multilayer porous body. INDUSTRIAL APPLICABILITY The present invention is applied to various applications such as a mixer, a chemical reaction tube, a cutter, a filter, a metal catalyst, a soundproofing material, and an impregnated metal in which a plurality of porous metal bodies having different pore characteristics are integrated with the surrounding metal cylinder. An object is to provide a possible porous metal composite cylinder.

[0004]

In order to achieve the above-mentioned object, a porous metal composite cylinder according to a first aspect of the present invention comprises a multi-structured metal cylinder arranged concentrically in a hot isotropy. A porous metal body made of a pressure-sintered body is formed, and the porous metal body is characterized in that the pore distribution is different for each layer. Here, the metal cylinder may be provided with a plurality of grooves on the inner and outer peripheral sides thereof, and in this case, the bonding strength between the metal cylinder and the metal porous body can be increased. Further, the metal cylinder may be a cylindrical shape having an inclination in the axial direction. In addition, the hot isostatic pressing process is a process in which a processing material is inserted into a pressure vessel, and a high isostatic pressure is applied using a gas as a pressure medium under a high temperature, thereby utilizing a synergistic effect of a high temperature and a high pressure. It refers to the process of sintering metal powder under pressure. The material of the metal powder is required by the environment of use (for example, corrosion resistance,
It is appropriately selected depending on the wear resistance and heat dissipation), and the porosity is also appropriately determined according to the application of the porous metal composite cylinder. If the temperature and pressure are too high, the porosity will decrease. On the other hand, if the temperature and pressure are insufficient, the adhesion between the particles will be insufficient. Therefore, adjust the temperature and pressure to the optimum values according to the type of metal powder used. There is a need.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments. FIG. 1B shows a porous metal composite cylinder 1 according to the present invention.
FIG. 2A and FIG. 2 show the constituent elements.
As shown in the figure, the porous metal-metal composite cylinder 1 is configured by forming a metal porous body made of a hot isostatic pressing sintered body in a metal cylinder having a concentric triple structure. Specifically, large, medium and small metal cylinders 2, 3 and 4 formed of corrosion resistant metal such as stainless steel, titanium and alloy are arranged concentrically, and a metal having a predetermined porosity and a predetermined pore diameter therein. It is configured by forming porous bodies 5, 6, and 7 (see FIG. 1).

The sintering raw material powder for the porous metal bodies 5, 6, 7 is, for example, stainless steel type (SUS304, SUS6).
30), tool steel (SKD61, SKD11, etc.), maraging steel (18Ni, 20Ni, etc.), high-speed steel (SKH51, SKH55, etc.), non-ferrous metal (aluminum alloy, titanium alloy, etc.) Metal is used. The porosity and the pore diameter of the metal porous body are appropriately selected as necessary, but the porosity is 7.0 to 50.0.
%, When the pore diameter is 500 μm or less, Japanese Patent Application No.
-255228. That is, the raw material powder having a particle size corresponding to the porosity and the pore diameter is vacuum-sealed in a capsule, and hot isostatic treatment is performed at a low temperature, a low pressure, and a short processing time, compared with the processing conditions of a highly dense sintered body. Pressure sintering (HIP) processing is performed. For example, in HIP processing using stainless steel or alloy tool steel-based powder as a raw material powder, the temperature is about 400 to 800 ° C., and the pressure is 50 to 150 M.
When the high speed steel-based powder is used as the raw material powder, the temperature is 300 to 800 ° C.
Degree, pressure 50 to 150 MPa, processing time 0.5
Approximately 4 hours. The porosity and pore diameter of the metal porous body obtained as a sintered body are adjusted by controlling the pressurizing temperature, the pressurizing force, the processing time and the like. Further, after the HIP treatment, if a heat treatment for maintaining the temperature range of 60 to 90% of the melting point for about 2 to 10 hours is performed without substantially changing the porosity and the pore diameter of the sintered body, The bonding between particles can be strengthened.

The porous metal composite cylinder 1 is integrally molded by the above-mentioned method, but a plurality of strips as shown in FIG. 1 (a) are formed on the inner and outer peripheral sides of the metal cylinders 2, 3 and 4. Grooves 3a, 3
b may be bored, in this case, metal cylinders 2, 3, 4
It is possible to further increase the bonding strength between the metal porous body 5, 6, and 7. The porous metal bodies 5, 6 and 7 may each have a multilayer structure in the axial direction, which is preferable because the pore distribution can be made different in the axial direction of the porous metal composite cylinder 1. . In this case, for example, the porosity may be reduced from the upper part to the lower part of the porous bodies 5 to 7, but the manufacturing method thereof is described in Japanese Patent Application No. 7-11159.
As disclosed in the specification of No. 3. That is, a plurality of kinds of metal powders having different particle sizes and materials are stacked and filled, and the temperature is 0.2 to 0.85 mpK and the pressing force is 0.5 to 150 MPa.
The hot isostatic pressing treatment may be performed under the above condition to manufacture the multi-layer metal porous bodies 7, 8 and 9. Here, mpK is the melting point (absolute temperature) of the powder, and refers to the melting point of the low melting point powder when different kinds of powders are stacked and filled. Alternatively, a plurality of kinds of metal powders having different particle sizes and materials may be stacked and filled, and after the cold pressing, a hot isostatic pressing may be performed.

FIG. 3 shows an embodiment in which the porous metal composite cylinder 1 according to the present invention is applied to a mixer. In this example, the axial lengths of the metal cylinders 2A to 4A are
The small diameter cylinder 4A is the shortest and the large diameter cylinder 2A is the longest. Further, the end portions of the metal porous bodies 5, 6, 7 in the respective cylinders 2A to 4A are processed to be inward spherical surfaces. By aligning the upper end surfaces of the metal cylinders 2A to 4A, the end portions of the porous metal bodies 5, 6, 7 have a multi-step spherical shape that gradually expands downward. When this porous metal composite tube 1 is used in a mixer, for example, from the upper void portions 7a, 6a, 5a of the metal porous body to 3
The seed gases A, B, and C are each press-fitted. Then, each of the gases A, B, and C that have been press-fitted flows out from the spherical end surface through the fine cavities of the porous bodies 5 to 7. The end faces of the porous bodies 5 to 7 respectively form minute jet outlets (nozzles), and the porous body chamber 7 located at the uppermost position.
Gas A is ejected from the end surface of the. Then, the pressure-injected gas A has a reduced atmospheric pressure and forms a micro vortex. Similarly, the gas B and the gas C also form a micro vortex, but the micro vortices ejected from a large number of the fumaroles of the porous body aggregate into a small vortex and further become a turbulent vortex and become uniform. Will be mixed in.

The mixing operation has been described above. Pt, Ag, Cu, and the like are added to the metal powders forming the porous bodies 5 to 7.
Various reaction mechanisms are formed by selecting Zn, Cr, Ni or the like and performing HIP sintering processing, or by forming a metal catalyst by HIP sintering processing metal powder obtained by plating or vapor depositing these metals. be able to. Therefore, it can be used not only as a mixer but also as a mechanism of a polymerization reaction or a polycondensation reaction by a chemical reaction. For example, when methanol is produced from natural gas, LPG, naphtha, etc., a Zn-Cr or Zn-Cr-Cu based catalyst is used.
It is produced at 50 to 400 ° C. and 50 to 300 atm, and it is safe and reliable to use the mixer of the present invention for these polymerization reactions. This is because the porous body of the porous metal composite cylinder 1 forms a minute cavity, so that the gas or liquid passing through this minute cavity is finely subdivided, and the gas or liquid passes over an extremely short time (instantaneously). This is because the mixing or catalytic polymerization is completed in due course. Further, the liquid A is press-fitted through the central void 7a, and this liquid A is subdivided by the porous body and ejected in a mist state, and at the same time, the gas body and the catalyst are ejected from the voids 6a, 5a, It is also possible to make a contact reaction instantaneously.

FIG. 4 shows an embodiment in which the porous metal composite cylinder 1 according to the present invention is applied to a cutter. In order to manufacture a cutter, the porous metal composite cylinder 1 formed by the HIP process is first cut into a required thickness (2.5 mm to 5 mm). Next, the outermost metal cylinder 2 is removed, and an opening 7a is provided at the center. Further, notches 5a are formed at required intervals in the radial direction of the porous metal body 5, and a small hole 5b for preventing cracking is formed at the end of the notch 5a. Then, a cutting blade 9 is formed by adhering a synthetic resin in which diamond powder is kneaded in the circumferential direction of the porous metal body 5 to complete a cutter using the porous metal body (see FIG. 4B). ). FIG.
In place of the above configuration, the medium diameter metal cylinder 3 and the metal porous body 7 in the center
It is also possible not to provide and. In this case, since the metal porous body is formed between the small-diameter metal cylinder 4 and the large-diameter metal cylinder 2, the outermost metal cylinder 2 is removed after the porous-metal composite cylinder 1 is cut into slices. Then, the cutting blade 9 is formed to complete the cutter using the porous metal body. In any case, since this cutter has many fine pores (cavities), the heat generated when the cutter is used is effectively cooled by the cooling water, preventing distortion and deformation of the cutter. Further, this cutter has a very large soundproof effect at the time of cutting due to the sound absorbing effect of the porous body.

FIG. 5 shows an embodiment in which the porous metal composite cylinder 1B according to the present invention is applied to an impregnated metal. In the case of this embodiment, the metal cylinders 2B, 3B
A porous metal body 5B is provided between the two, and a hollow through hole 8 for a shaft is provided in the central porous metal body 6B.
The porous metal-metal composite cylinder 1B includes an inner metal porous body 6
If B is impregnated with lubricating oil and the cooling medium is circulated through the outer porous metal body 5B, a high-performance impregnated metal can be realized. The porosity of each porous body is appropriately set, and the porosity and the pore diameter of the metal porous body 5B are formed sufficiently large. Further, it goes without saying that the porous metal composite cylinder 1B shown in FIG.

FIG. 6 shows an embodiment in which the porous metal composite cylinder 1 according to the present invention is applied to a filter or the like. In the case of this embodiment, the metal cylinders 2C, 3
The shapes of C and 4C are inclined in the axial direction. Then, the porous metal composite cylinder 1 is formed by the HIP processing described above.
After molding, by removing the metal cylinders 2C, 3C, 4C, the metal porous bodies 5, 6 can be obtained. In the case of this embodiment, since the metal cylinders 2C, 3C, 4C are inclined in the axial direction, the expansion of the metal cylinder and the porous body
The metal cylindrical portion can be relatively easily removed due to the difference in shrinkage rate and the residual stress. It should be noted that it is easier to manufacture the one in which the metal cylinder 4C is joined to the inner peripheral portion of the metal porous body 6 and the one in which the metal cylinder 3C is joined to the inner peripheral portion of the metal porous body 5. .

[0013]

As described above, the porous metal composite cylinder according to the present invention includes a metal cylinder made of a hot isotropic pressure-sintered body in a multi-structured metal cylinder arranged concentrically. Since it is made of a porous material and the pore distribution of the metal porous material is different for each layer, it can be used as a material for mixers, chemical reaction tubes, cutters, filters, metal catalysts, soundproofing materials, impregnated metals, etc. It is preferably used and its industrial value is extremely large.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a porous metal composite cylinder.

FIG. 2 is a diagram showing components of the porous metal composite cylinder of FIG.

FIG. 3 illustrates a mixer using a porous metal composite cylinder.

FIG. 4 illustrates a cutter using a porous metal composite cylinder.

FIG. 5 illustrates an impregnated metal using a porous metal composite cylinder.

FIG. 6 illustrates a filter using a porous metal composite cylinder.

[Explanation of symbols]

 1 Porous metal composite cylinder 2-4 Metal cylinder 5-7 Metal porous body

Front page continued (72) Inventor Ryutaro Motoki 1-1-1, Nakamiya Oike, Hirakata City, Osaka Prefecture Kubota Hirakata Manufacturing Company (72) Inventor Jun Funakoshi 1-1-1, Nakamiya Oike, Hirakata City, Osaka Prefecture Stock company Kubota Hirakata Factory (72) Takashi Nishi Nishi 1-1-1, Nakamiya Oike, Hirakata-shi, Osaka Prefecture Company Kubota Hirakata Factory (72) Inventor Akira Kosaka 1-1-1, Nakamiya Oike, Hirakata-shi, Osaka No. 1 stock company Kubota Hirakata Factory

Claims (3)

[Claims] 1. A metal porous body made of a hot isostatically pressed sintered body is formed in a multi-structured metal cylinder arranged concentrically, and the metal porous body is provided for each layer. A porous metal composite cylinder characterized by different pore distributions. 2. The porous metal composite cylinder according to claim 1, wherein the metal cylinder has a plurality of grooves formed on the inner and outer peripheral sides thereof. 3. The porous metal composite cylinder according to claim 1, wherein each of the metal cylinders is a cylinder having an inclination in the axial direction.