WO2017082597A1 - 분말성형용 왁스계 열가소성 유기결합제 조성물 및 이를 이용한 피드스탁 조성물 - Google Patents
분말성형용 왁스계 열가소성 유기결합제 조성물 및 이를 이용한 피드스탁 조성물 Download PDFInfo
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- WO2017082597A1 WO2017082597A1 PCT/KR2016/012713 KR2016012713W WO2017082597A1 WO 2017082597 A1 WO2017082597 A1 WO 2017082597A1 KR 2016012713 W KR2016012713 W KR 2016012713W WO 2017082597 A1 WO2017082597 A1 WO 2017082597A1
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- Prior art keywords
- wax
- powder
- organic binder
- weight
- feedstock
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Definitions
- the present invention belongs to the field of parts manufacturing industry, which precisely manufactures a product having a complex shape by low pressure powder molding, such as slurry casting, powder injection molding, micro powder injection molding, etc., using a powder material such as metal or ceramic.
- the present invention relates to an environmentally friendly and economical new organic binder composition which is kneaded together with a powder material to impart fluidity of the powder mixture as one raw material component for powder molding.
- Feedstock a mixture made by kneading metal powder, ceramic powder or mixed powder thereof with an organic binder, is used for molding powder products of precise and complex shape by precise powder molding techniques such as casting, powder injection molding and micro injection molding. It has been widely used.
- Slurry casting is a method of forming a shape by pouring a mixture of solid powder and organic binder mixed in a slurry state into a mold having a desired product shape by magnetic load without help from external pressure.
- Low-pressure powder injection molding may be applied to apply an injection pressure of about 5 MPa or less. When the viscosity of the feedstock is increased, powder injection molding may be performed at a higher injection pressure.
- the organic binder plays an important role in forming a high flowable feedstock capable of being kneaded with a solid powder such as a metal or a ceramic in a molten state and capable of casting or injection even under low pressure.
- Water-soluble organic binders are mainly used for slurry casting, and non-aqueous thermoplastic organic binder compositions useful for low pressure injection molding are used as they are or are known as powder injection molding organic binders, rather than being developed separately.
- wax-based thermoplastic organic binder compositions useful for powder injection molding are known.
- the water-insoluble wax-based organic binder is largely, firstly, a wax component that enables molding, and secondly, a backbone polymer component that maintains the shape of the injection molding until degreasing and sintering are started by exhibiting heat resistance at a high temperature.
- process control components such as surfactants or lubricants that bind to the backbone polymer and impart adhesion to the metal or ceramic powder, and other additives are used to improve fluidity or strength as needed.
- Paraffin wax has about 20 to 40 carbon atoms, has a chemical formula of C n H 2n + 2 , and wax is widely used as a basic component of the thermoplastic organic binder. It has a low melting point of about 46 ° C. to 60 ° C. and high fluidity in the molten state. . However, since 80-90% by weight of the component is normal paraffin and is crystallized into large grains, it tends to crumble at room temperature. Since it is a nonpolar compound, the adhesion to a solid powder surface such as metal or ceramic is poor. Therefore, paraffin wax has a high tendency to be separated from the solid powder because it is inferior in dispersibility or fluidity when mixed with the solid powder. To improve this, other kinds of branched waxes, surfactants having hydroxyl groups, carboxyl groups or amide groups, or low molecular weight organic compounds having functional groups such as palm oil or fatty oil can be added.
- microcrystalline wax has the effect of enhancing the coatability (adhesiveness) and strength of the wax mixture as a coating material (US Pat. Nos. 2,885,340, 3023156), and carnauba wax in vegetable or animal fats. It is proposed to use it as a lubricant in admixture with at least one (US Patent Publication No. 2012/0031233).
- the waxes, surfactants or lubricants described above have been widely used as lubricants to reduce the friction or bonding that occur during molding by mixing or using metal powders or by applying them to mold walls in conventional powder metallurgy methods.
- polyethylene wax can be effectively used together with synthetic amide wax in aluminum or its alloys which have a high tendency to adhere to a mold or a punch during powder molding (US Pat. No. 5,951,737).
- the molded body of the metal and the ceramic powder mixed with the organic material is inferior in strength, and in particular, it is difficult to maintain the shape in the degreasing process, which is the removal process of the organic binder formed after molding. Therefore, in order to maintain the shape degreased during the heating process, it is necessary to add a polymer having a higher molecular weight, a higher melting point, and a higher strength than the wax as a backbone polymer.
- An object of the present invention is useful for low pressure powder molding, such as slurry casting, powder injection molding, micro powder injection molding, etc., which have high fluidity in the molten state and excellent adhesion to metal and ceramic powder surfaces, and are formed under no pressure or low pressure. It is to provide an environmentally friendly wax-based thermoplastic organic binder composition that can be suitably used for the production of high-flow feedstock.
- Another object of the present invention is to provide a high flow feedstock useful for low pressure powder molding technology using the wax-based thermoplastic organic binder composition.
- the present invention is a wax mixture containing paraffin wax and microcrystalline wax 50 to 94% by weight, 3 to 35% by weight polyolefin copolymer having a carbonyl group as a backbone polymer and 3 to 15% by weight of the process control agent It provides a wax-based thermoplastic organic binder composition comprising a%.
- the wax mixture may consist of 30 to 90% by weight of paraffin wax and 10 to 70% by weight of microcrystalline wax.
- the backbone polymer may be a polyolefin copolymer copolymerized with maleic anhydride containing 0.1 to 50% by weight of maleic anhydride with respect to 100% by weight of polyolefin, and the backbone polymer has a normal temperature density of 0.9g / cm 3 to 1.10g / cm 3 , Vicat softening temperature may be 70 to 125 °C, melt flow index (190 °C, load 2.15kg f ) may be 5 to 20.
- the polyolefin may be selected from the group consisting of ethylene vinyl acetate, low density polyethylene, high density polyethylene, and polypropylene copolymers.
- the process control agent may be selected from the group consisting of stearic acid, synthetic amide waxes, fatty oils and polyolefin waxes.
- the organic binder composition according to the present invention may further include a polymer selected from the group consisting of low density polyethylene, high density polyethylene, and polypropylene copolymer in addition to the polyolefin polymer having a carbonyl group as the backbone polymer.
- the present invention is pure iron, austenitic stainless steel, precipitation hardening stainless steel, martensitic stainless steel, maraging steel, heat-resistant steel, high-speed steel, Fe-Si silicon steel, Fe-Si-Al sendust, Fe-Ni Invar , Cobalt-based alloys, Nickel-based alloys, Mo-Cu, W-Cu, W-Ni-Cu, W-Ni-Fe, WC-Co cemented carbide, pure copper, Cu-Be beryllium copper, Cu-Al alloys, Cu-Ni 10 to 50% by volume of the wax-based thermoplastic organic binder composition is added to 100% by volume of the powder selected from the group consisting of -Sn alloy, aluminum, aluminum alloy, magnesium alloy, titanium and titanium alloy.
- a feedstock composition which is prepared by kneading at a temperature.
- the feedstock composition according to the present invention is an inorganic powder selected from Al 2 O 3 , SiC, AlN, B 4 C, Si 3 N 4 , h-BN, c-BN, MoS 2 , TiC, TiN or TiB 2 , short fibers It may further comprise a reinforcing material selected from the group consisting of short carbon fibers, graphite flakes, carbon nanotubes, diamonds and graphene to provide a composite feedstock composition.
- the present invention is 30 to 50% by volume of the wax-based thermoplastic organic binder composition; And inorganic powders selected from Al 2 O 3 , SiC, AlN, B 4 C, SiO 2 , Si 3 N 4 , h-BN, c-BN, TiC, TiN or TiB 2 , polycarbon, graphite flakes, carbon nanotubes ,
- a feedstock composition comprising 70 to 50% by volume of a composite powder composed of aluminum powder and at least one selected from the group consisting of a powder selected from graphene or diamond, and an inorganic material in the form of short fibers or nanotubes. to provide.
- the aluminum powder may be included in 5 to 40% by weight based on 100% by weight of the composite powder, the average diameter of the aluminum powder may be 0.1 to 20 ⁇ m.
- the wax-based thermoplastic organic binder composition according to the present invention uses a polyolefin copolymer having a carbonyl group as a backbone polymer as a backbone polymer in consideration of solid powders such as metals and ceramics, and has excellent fluidity, such as slurry casting, powder injection molding, It can be usefully used in the field of low pressure powder molding such as micro injection molding.
- the wax-based thermoplastic organic binder composition is kneaded with a metal or alloy having a spherical or near spherical shape having a particle size of 60 ⁇ m or less, more preferably 20 ⁇ m or less, and may be used as a feedstock useful for low pressure powder molding technology.
- the reinforcing material may be included in the metal or alloy to make a composite feedstock useful for low pressure powder molding technology.
- wax-based thermoplastic organic binder composition when the wax-based thermoplastic organic binder composition is appropriately modified to increase the viscosity or to adjust the content of the solid powder, a powder injection molding technique that applies an injection pressure of 30 MPa or more to a lightweight metal having a low density is used. It can also be useful for manufacturing precise parts with complex shapes.
- the organic binder composition according to the present invention is kneaded at 10 to 30% by volume with respect to the metal or alloy having a particle size of 60 ⁇ m or less, by warm compression or warm extrusion molding under a significantly lower pressure than the conventional method. It can be suitably used to manufacture precision products made of metal, alloy or ceramic reinforced composites, and especially can be used to make porous precision shaped parts of hard materials.
- Figure 1 shows a schematic view of the ring mold developed in the present invention to investigate the tendency to crack during the solidification and cooling process of the organic binder.
- FIG. 2 is a photograph showing representative results of a ring mold test that investigates the sensitivity of crack generation due to solidification and cooling of an organic binder [(a) Example 1, (b) Example 2, (c) Example 3, ( d) Comparative Example 6, (e) Comparative Example 7, (f) Comparative Example 8].
- Figure 3 is a photograph showing a metal powder molded body prepared using the organic binder according to the present invention: (a) copper powder bar molded body prepared by slurry casting, (b) low-pressure aluminum powder disk molded body, (c) slurry 316L stainless powder compact produced by casting.
- Figure 4 is a photograph showing the (a) ASTM subsize tensile test piece and (b) dogbone type tensile test piece injection molded aluminum powder using the organic binder according to the present invention.
- Figure 5 shows the microstructure photograph after sintering of low-pressure molded 316L stainless steel powder compact using the organic binder according to the present invention.
- FIG. 6 shows a scanning electron microscope image observed for a specimen sintered body having an addition ratio of aluminum powder and silicon carbide powder of 2: 8.
- a wax mixture comprising paraffin wax and microcrystalline wax, 3 to 35% by weight of a polyolefin copolymer having a carbonyl group as a backbone polymer, and 3 to 15% by weight of a process control agent. It provides a wax-based thermoplastic organic binder composition.
- Thermoplastic organic binders that can be used for low pressure powder molding such as slurry casting, powder injection molding, and micro injection molding, are required to be composed of solid powders such as metals and ceramics and organic binders. It should be well formed, not only good fluidity in the slurry state, but also when forming at low pressure, the solid powder and the organic binder should be able to fill the mold in a homogeneous flow without separation from each other. It is very important that the solid powder is uniformly distributed in the resultant molded body to show different densification for each part in the subsequent sintering process so that shape deformation does not occur.
- the low pressure powder molding should be used to be excellent in the fluidity of the organic binder to be used, and the bonding properties between the solid powder and the organic binder, such as metal or ceramic powder.
- the content of the wax should be high among the organic binder components, and it is advantageous to lower the content of the backbone polymer having a relatively high melting point and a large molecular weight.
- non-polar polyolefin-based polymers have been widely used as the backbone polymer, and in order to improve the bonding property on the surface of metals or ceramics, a surfactant having a hydroxyl group or a carboxyl group or a synthetic amide-based surfactant has been added.
- the present invention is characterized in that a polyolefin copolymer having a carbonyl group is used as a backbone polymer in order to impart bonding property to the polymer, and an organic binder composition which improves the bonding property between the organic binder and the metal and the ceramic while maintaining fluidity is provided. It was developed.
- the polyolefin copolymer having a carbonyl group is used as the main component of the backbone polymer as in the present invention
- the molded body is excessively bonded to the mold wall.
- the adhesion tends to increase, and thus, it may be difficult to separate and release the molded body from the mold or the mold after molding, and in severe cases, cracking may occur during the cooling process.
- a low molecular weight surfactant or lubricant as a process control agent.
- a process control agent for example, stearic acid having a carboxyl group or synthetic amide wax ethylene bis-stearicamide wax (Accrawax ® C, registered trademark of Lonza USA; or Ricowax ® , Swiss Clariant) (Trademark), and the like, and polyethylene wax (US Pat. No. 5,951,737) or carnauba wax (US Patent Publication No. 2012/0031233) wax composition mixed with vegetable or animal fatty oils may also be used.
- the paraffin wax having a large coagulation shrinkage and heat shrinkage is added to the organic binder of the present invention having excellent flowability as a major component, more than 50% is added, although it is excellent in fluidity in the molten state, it is formed into a shaped body of a specific shape and solidification and heat shrinkage during cooling. There is a high tendency for cracks to occur.
- a ring mold test method has been devised to determine the sensitivity to crack initiation in the highly fluid organic binder according to the present invention.
- This method uses a ring-shaped metal mold with a constant width, and pours the molten organic binder to solidify during the fast cooling process and investigate whether or not the tendency of cracks may occur during the cooling process. to be.
- Figure 1 shows a schematic view of the ring mold devised and used in the present invention.
- feedstock is prepared using commercial metal powder and powder for commercial metal powder injection molding, and are used for pressureless slurry casting, powder injection molding, and low pressure compression molding in warm. It is possible to produce a high-density sintered body by degreasing and sintering the molded body produced by manufacturing the molded body.
- Paraffin wax has the advantages of low melting point, very low viscosity, and excellent fluidity in the molten state, but weak adhesion to solid powders such as metals and ceramics, and volume shrinkage during solidification and cooling process from the molten state. Because of the large crystal grains and the like, there is a disadvantage in brittleness at room temperature, so modification is required.
- paraffin wax which is the main component of the organic binder forming the molded body
- microcrystalline wax in order to compensate the brittleness of the paraffin wax, which is the main component of the organic binder forming the molded body, it is preferable to add microcrystalline wax. More specifically, paraffin wax and microcrystalline wax are mixed at 30 to 90% by weight and 10 to 70% by weight, particularly preferably at 50 to 80% and 20 to 50% by weight.
- the wax-based thermoplastic organic binder composition according to the present invention includes a polyolefin polymer having a carbonyl group as a backbone polymer, and the polyolefin copolymer having a carbonyl group improves the mechanical properties of the powder compact and has moldability in a homogeneous flow when molding. It serves to maintain the shape of the molded body during the degreasing process, it may be included in the range of 3 to 35% by weight relative to the total 100% by weight of the organic binder composition.
- the backbone polymer is a copolymer of maleic anhydride having a density of 0.90 to 0.98 g / cm 3 at room temperature, a Vicat softening temperature of 70 to 125 ° C., and a melt flow index (190 ° C., load of 2.15 kg f ) of 5 to 20. It may be a polyolefin copolymer, the polyolefin copolymer copolymerized with maleic anhydride may be hydrolyzed and modified with a carboxyl group as in Scheme 1.
- the content of maleic anhydride present in the polyolefin copolymer copolymerized with maleic anhydride is preferably 0.1 to 50% by weight based on 100% by weight of the copolymer.
- the wax-based thermoplastic organic binder composition according to the present invention is a surfactant or lubricant as a process control agent to control the excessive adhesion of metal and ceramic particles by the polyolefin copolymer having a carbonyl group to 100% by weight of the organic binder composition. It may further comprise 0.01 to 20% by weight.
- the process control agent may use one or more compounds selected from the group consisting of stearic acid, synthetic amide waxes, fatty oils and polyolefin waxes.
- the wax-based thermoplastic organic binder composition according to the present invention is a low density polyethylene, a high density polyethylene, and a polypropylene copolymer in addition to the polyolefin copolymer having a carbonyl group as the backbone polymer in order to control the viscosity of the high flowability organic binder high.
- One polymer selected from the group consisting of can be mixed up to 20% by weight.
- the present invention is pure iron, austenitic stainless steel, precipitation hardening stainless steel, martensitic stainless steel, maraging steel, heat-resistant steel, high-speed steel, Fe-Si silicon steel, Fe-Si-Al sendust, Fe-Ni Invar , Cobalt-based alloys, Nickel-based alloys, Mo-Cu, W-Cu, W-Ni-Cu, W-Ni-Fe, WC-Co cemented carbide, pure copper, Cu-Be beryllium copper, Cu-Al alloys, Cu-Ni 10 wt% to 50 wt% of the wax-based thermoplastic organic binder composition is added to 100 wt% of the powder selected from the group consisting of Sn alloy, aluminum, aluminum alloy, magnesium alloy, titanium and titanium alloy, Provided is a feedstock composition, which is prepared by kneading at a temperature.
- the feedstock composition according to the present invention is an inorganic powder selected from Al 2 O 3 , SiC, AlN, B 4 C, Si 3 N 4 , h-BN, c-BN, MoS 2 , TiC, TiN or TiB 2 , or Fiber, short carbon fibers, graphite flakes, carbon nanotubes, diamond and graphene may further be provided as a composite feedstock composition further comprising a reinforcement.
- the feedstock composition according to the present invention is a wax-based thermoplastic organic binder composition 30 to 50% by volume; And inorganic powders selected from Al 2 O 3 , SiC, AlN, B 4 C, SiO 2 , Si 3 N 4 , h-BN, c-BN, TiC, TiN or TiB 2 , polycarbon, graphite flakes, carbon nanotubes It can be provided as a composite feedstock composition consisting of 70 to 50% by volume of the composite powder consisting of aluminum powder and one or more selected from the group consisting of powders selected from graphene or diamond, and inorganic materials in the form of short fibers or nanotubes. have.
- the aluminum powder is contained in 5 to 40% by weight based on 100% by weight of the composite powder, the average size of the aluminum powder may be 0.1 to 20 ⁇ m.
- the wax-based thermoplastic organic binder composition according to the present invention is simple and eco-friendly in composition, but contains a large amount of paraffin wax, the organic binder composition is subjected to excessive shrinkage during the molding process tends to crack. .
- the present invention proposes a ring mold casting test having a constrained geometry so that the above trend can be simply tested.
- 1 shows a schematic of the ring mold.
- the ring mold is made of AISI 304 austenitic steel and has a groove having an outer diameter of 57 mm, an inner diameter of 37 mm, and a height of 4.85 mm, and a wide aluminum plate having a thickness of 4 mm is installed at the bottom of the ring mold to remove heat from the ring mold. Inverted to allow rapid cooling of 50 ° C./min at the beginning of solidification.
- shrinkage occurs along the shrinkage, circumferential and radial directions generated during the solidification and cooling of the organic binder after dissolving the organic binder.
- Table 1 summarizes the results of experiments conducted on the organic binder compositions synthesized in Examples 1 to 13 and Comparative Examples 1 to 10.
- the composition of this example was very excellent in fluidity in the molten state, and did not generate thermal cracking even during rapid solidification (FIG. 2A).
- the organic binder was dissolved and poured into a mold to prepare a plate-shaped specimen of about 33 mm (length) x 13 mm (width) x 3.5 mm (height), and the bending strength measured by the three-point bending test was about 9.4 MPa.
- an organic binder composition was prepared by dissolving 24.8 g of paraffin wax, 8.8 g of microcrystalline wax, 2.4 g of polyethylene wax, 3.2 g of maleic anhydride graft-polyethylene, and 0.8 g of low density polyethylene at 145 ° C. .
- the organic binder thus prepared was excellent in fluidity in the molten state, and thermal cracking was not observed as a result of the ring mold test proposed by the present invention (FIG. 2B).
- the specimen was prepared in the same manner as in Example 1 and measured by a three-point bending test, the bending strength was shown to be about 11.1 MPa.
- Examples 1 and 2 and that the polyethylene wax in Accra similar composition replaced with Wax ® C (ACRAWAX C ®, Lonza, Inc., Switzerland R), 25.6g of paraffin wax, microcrystalline wax of 8.8g, 3.2g 40 g of organic binder composition was prepared by dissolving 2.4 g of maleic anhydride graft polyethylene and 2.4 g of Accrawax ® C at 145 ° C.
- the organic binder thus prepared showed excellent fluidity in the molten state and no occurrence of thermal cracking was observed by the ring mold test method.
- the flexural strength was about 9.8 MPa as measured in the three-point bending test as in Example 1.
- an organic binder composition was prepared by dissolving 24.8 g of paraffin wax, 10.4 g of microcrystalline wax, 2.4 g of polyethylene wax, 2.4 g of polyethylene grafted with maleic anhydride, and 0.8 g of low density polyethylene at 145 ° C. .
- the organic binder thus prepared was excellent in fluidity in the molten state, and cracking was not observed as a result of the test by the ring mold test method proposed by the present invention.
- Example 2 In addition, the specimen was prepared in the same manner as in Example 1 and measured by a three-point bending test, the bending strength was shown to be about 11.3 MPa.
- Example 7 45% by weight of paraffin wax, 45% by weight of micro crystalline wax, 5% by weight of polyethylene wax, 5% by weight of maleic anhydride graft polyethylene (Example 7), 72% by weight of paraffin wax, microcrystalline 20 wt% wax, 8 wt% maleic anhydride graft polyethylene (Example 8), 65 wt% paraffin wax, 28 wt% microcrystalline wax, 4 wt% polyethylene wax, 3 wt% maleic anhydride graft polyethylene (Example In the case of 9), the mixture was uniformly mixed in the molten state as before, and the flowability was very high.
- Table 1 The composition of the components shown in Table 1, namely 56 wt% paraffin wax, 24 wt% microcrystalline wax, 10 wt% polyethylene wax, 10 wt% maleic anhydride graft polyethylene (Example 10), 60 wt% paraffin wax, micro 20% by weight crystalline wax, 6%
- paraffin wax 10 wt% polyethylene wax (Comparative Example 4), paraffin wax 63 wt%, microcrystalline wax 5 wt%, polyethylene wax 5%, maleic anhydride graft polyethylene 9 wt% in the components shown in Table 1.
- Feedstock having a solid phase rate of 62% by kneading the organic binder of Example 4 with 138.88 g of a spherical copper powder having a particle size of 1 to 5 ⁇ m and a purity of 99.9% (CU 110, Atlantic Equipment, Inc., USA) at 145 ° C. was prepared.
- the prepared feedstock was heated to 160 ° C. to form a slurry having high fluidity, and then poured into a mold preheated at 150 ° C. to 90 ° C., thereby solidifying a 14 mm x 34 mm x 6 mm sound molded body (FIG. 3A). No cracking was observed on the molded body surface.
- a spherical aluminum powder having a purity of 99.8% (British Aluminum Products Company) and an organic binder of Example 5 were kneaded at 140 ° C. to prepare a feedstock having a solid phase rate of 65%. .
- AISI 316L powder manufactured by Carpenters, Inc.
- AISI 316L powder having a particle size of -22 ⁇ m was kneaded at 140 ° C. with an organic binder having the composition of Example 3 to prepare a feedstock having a solid phase rate of 60%.
- the prepared feedstock is heated to 150 ° C. to form a highly fluid slurry, and then, the slurry is poured into a mold of a tensile test piece having a predetermined length of 22 mm, a parallel part of 5 mm, and a total length of 54 mm, which is preheated to 70 ° C. Cooled.
- a tensile test piece molded body of any size having a thickness of about 6 mm without a surface defect was produced (FIG. 3C).
- Aluminum powder (MEP 105, Eka Granule, Germany) having a purity of 99.5% having an average particle size of about 6 ⁇ m and the organic binder of Example 4 were kneaded at 140 ° C. to prepare a feedstock having a solid phase rate of 62%. It was granulated to a size of about 5 mm and inserted into an injection machine (Austria Engel, model name VC330 / 80 Tech Pro) having a clamping force of 80 ton, followed by injection molding to ASTM subsize plate tensile test piece (ASTM E8) (FIG. 4A) and powder metallurgy. Tensile test specimens of the dog-bone form (MPIF Standard 50, American Powder Association Standard) were prepared (FIG. 4b).
- the molded article was placed in an alumina tray, charged in a tubular furnace, and degreased and sintered in a single process by a heating schedule as follows while flowing hydrogen gas at a flow rate of 0.5 L / min: RT to 100 ° C. and 1.5.
- Example 3 40 vol% of organic binder of Example 3 developed by the present invention and silicon carbide (SiC) powder having an average size of about 48 ⁇ m (manufactured by Showa Denko KK Co., Ltd.) and aluminum powder having an average size of about 5 ⁇ m (MEP 105 , About 50 g of feedstock consisting of 60% by volume of solid powder mixed with a weight ratio of 4: 1 to 9: 1 in Germany, for 2 hours at 140 ° C. in a small kneader (Leochord 900, Hockey, Germany). Kneaded. Subsequently, the feedstock for low-pressure molding was granulated by crushing into granules of about 2 mm or less. The feedstock thus prepared can be used as a useful material for making silicon carbide porous sieves.
- SiC silicon carbide
- 3 g of the feedstock was charged into a mold preheated to 120 ° C., and a low pressure of about 10 MPa was applied to form a disk shaped body having a diameter of 20 mm x 4 mm in height.
- the formed article was charged into a tubular resistance furnace and heated by the following heating schedule while flowing nitrogen gas at a flow rate of 0.3 L / min: normal temperature to 100 DEG C, 3 DEG C / min; 0.5h hold; 100 to 360 ° C, 2.5 ° C / min; 2h hold; 360 to 520 ° C, 0.8 ° C / min; 3h hold; 520-650 ° C., 2.5 ° C./min; Cooling after 3h maintenance.
- FIG. 6 shows an example of a scanning electron microscope observed for a specimen sintered body in which an addition ratio of aluminum powder and silicon carbide powder is 2: 8.
- the silicon carbide porous sintered body bonded by aluminum nitride was produced using the feedstock composition of this invention.
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Abstract
Description
Claims (12)
- 파라핀 왁스와 마이크로크리스탈린 왁스를 포함하는 왁스 혼합물 50 내지 94 중량%, 백본 고분자로서 카르보닐기를 갖는 폴리올레핀 공중합체 3 내지 35 중량% 및 공정제어제 3 내지 15 중량%로 이루어진 것을 특징으로 하는 왁스계 열가소성 유기결합제 조성물.
- 청구항 1에 있어서, 상기 왁스 혼합물은 파라핀 왁스 30 내지 90 중량% 및 마이크로크리스탈린 왁스 10 내지 70 중량%로 이루어진 것을 특징으로 하는 왁스계 열가소성 유기결합제 조성물.
- 청구항 1에 있어서, 상기 백본 고분자는 폴리올레핀 100 중량%에 대하여 무수말레인산을 0.1 내지 50 중량%로 함유한 무수 말레인산 그라프트 폴리올레핀 공중합체인 것을 특징으로 하는 왁스계 열가소성 유기결합제 조성물.
- 청구항 3에 있어서, 상기 백본 고분자는 상온 밀도가 0.9g/cm3 내지 1.10g/cm3, 바이캣 (Vicat) 연화온도가 70℃ 내지 125℃, 용융흐름지수 (190℃, 하중 2.15kgf)가 5 내지 20인 것을 특징으로 하는 왁스계 열가소성 유기결합제 조성물.
- 청구항 4에 있어서, 상기 폴리올레핀은 에틸렌 비닐아세테이트, 저밀도 폴리에틸렌, 고밀도 폴리에틸렌, 및 폴리프로필렌 공중합체로 이루어진 군에서 선택된 것을 특징으로 하는 왁스계 열가소성 유기결합제 조성물.
- 청구항 1에 있어서, 상기 공정제어제는 스테아린 산, 합성 아미드 왁스, 지방유 및 폴리올레핀 왁스로 이루어진 군에서 선택된 것을 특징으로 하는 왁스계 열가소성 유기결합제 조성물.
- 순철, 오스테나이트계 스테인레스강, 석출경화형 스테인레스강, 마르텐사이트계 스테인레스강, 마르에이징강, 내열강, 고속도강, Fe-Si 규소강, Fe-Si-Al 센더스트, Fe-Ni 인바, 코발트기 합금, 니켈기 합금, Mo-Cu, W-Cu, W-Ni-Cu, W-Ni-Fe, WC-Co 초경합금, 순동, Cu-Be 베릴륨동, Cu-Al 합금, Cu-Ni-Sn 합금, 알루미늄, 알루미늄 합금, 마그네슘 합금, 티타늄 및 티타늄 합금으로 이루어진 군에서 선택된 금속 또는 합금 분말 100 부피%에 대하여 청구항 1 내지 청구항 6 중 어느 한 항에 따른 왁스계 열가소성 유기결합제 조성물을 10 내지 50 부피%로 포함되고, 100℃ 내지 180℃의 온도에서 혼련시켜 제조한 것을 특징으로 하는 피드스탁 조성물.
- 청구항 7에 있어서, 상기 금속 또는 합금 분말의 평균직경은 0.05 내지 60μm 인 것을 특징으로 하는 피드스탁 조성물.
- 청구항 7에 있어서, 상기 피드스탁 조성물은 Al2O3, SiC, AlN, B4C, Si3N4, h-BN, c-BN, MoS2, TiC, TiN 또는 TiB2에서 선택된 무기물 분말, 단섬유, 탄소 단섬유, 흑연 플레이크, 탄소나노튜브, 다이어몬드 및 그래핀으로 이루어진 군에서 선택된 보강재를 더 포함하는 금속기 복합분말인 것을 특징으로 하는 피드스탁 조성물.
- 청구항 1 내지 청구항 6 중 어느 한 항에 따른 왁스계 열가소성 유기결합제 조성물 30 내지 50 부피%; 및 Al2O3, SiC, AlN, B4C, SiO2, Si3N4, h-BN, c-BN, TiC, TiN 또는 TiB2에서 선택된 무기물 분말, 폴리카본, 흑연 플레이크, 탄소나노튜브, 그래핀 또는 다이어몬드에서 선택된 분말, 및 단섬유 또는 나노튜브 형태의 무기재료로 이루어진 군에서 선택된 한 가지 이상과 알루미늄 분말로 구성된 복합분말 70 내지 50부피% 로 이루어진 것을 특징으로 하는 피드스탁 조성물.
- 청구항 10에 있어서, 상기 알루미늄 분말은 복합분말 100 중량%에 대하여 5 내지 40 중량%로 포함된 것을 특징으로 하는 피드스탁 조성물.
- 청구항 10에 있어서, 상기 알루미늄 분말의 평균직경은 0.1 내지 20μm 인 것을 특징으로 하는 피드스탁 조성물.
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