WO2004052572A1 - 球状鋳物砂及び製造方法 - Google Patents
球状鋳物砂及び製造方法 Download PDFInfo
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- WO2004052572A1 WO2004052572A1 PCT/JP2003/015704 JP0315704W WO2004052572A1 WO 2004052572 A1 WO2004052572 A1 WO 2004052572A1 JP 0315704 W JP0315704 W JP 0315704W WO 2004052572 A1 WO2004052572 A1 WO 2004052572A1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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Definitions
- the present invention relates to a spherical sand, a method for producing the same, and a mold for use, which can be used for a mold for steel, steel, aluminum, copper, and alloys thereof.
- silica sand has been widely used as natural sand. Since silica sand is a mineral product, its shape is indeterminate, lacks fluidity, and has poor filling properties. Therefore, the surface of the diamond mold made of silica sand is rough, and thus the surface of the manufactured product (animal) becomes rough, and the load on the subsequent polishing process is increased. In addition, quartz, which is a constituent mineral of quartz sand, is transformed into cristobalite and the like by the heat load during construction, and collapses due to the volume change at that time. Therefore, the regeneration efficiency of quartz sand as mineral sand is low.
- spherical mineral sand see, for example, Japanese Patent Application Laid-Open No. Hei 4-3667349
- highly siliceous spherical mineral sand and a method for producing the same (for example, see Japanese Patent Application Laid-Open No. No. 1,691,184).
- These are obtained by granulating the raw material composition into spheres and then firing in a rotary kiln or the like.
- the obtained marine sand has low sphericity, so its fluidity and filling properties are insufficient, and the effect of improving the roughness of the marine surface is small.
- the present invention contains the A 1 2 0 3 and S I_ ⁇ 2 as a main component, A l 2 ⁇ 3 / S i 0 2 weight ratio 1-1 5, the average particle size to provide 0.0 5 to 1.5 spherical ⁇ sand produced by a flame fusion method is in mm. Further, the present invention contains the A 1 2 0 3 and S i O 2 as a main component, A 1 2 ⁇ 3 / S I_ ⁇ 2 weight ratio is 1 to 1 5, average particle size 0.0 Provide spherical sand with 5-1.5mm, sphericity of 0.95 or more.
- the present invention A 1 2 ⁇ 3 and S i 0 2 as a main component, A 1 2 ⁇ 3 ZS I_ ⁇ 2 weight ratio of 0.9 to 1 7, the average particle size of 0.0 5
- a method for producing the spherical natural sand comprising a step of melting and spheroidizing 2 mm powder particles in a flame.
- the present invention provides a molding die including the spherical sand.
- FIG. 1 is a reflection micrograph (magnification: 100 times) of the animal sand obtained in Example 1.
- FIG. 2 is a reflection micrograph (magnification: 100 ⁇ ) of the animal sand obtained in Comparative Example 1.
- FIG. 3 is a graph showing the results of a time-dependent strength test of the molds prepared from the natural sands obtained in Example 9 and Comparative Examples 1 and 4. DETAILED DESCRIPTION OF THE INVENTION
- the present invention provides a spherical sand, which is excellent in fluidity, is capable of producing a molding die having high strength and a smooth surface, a method for producing the same, and the molding die.
- the present inventors have found that refractory particles having a specific component composition and particle size, a large sphericity, and a small water absorption exhibit excellent performance as a natural sand, thereby completing the present invention. Reached.
- the spherical sand of the present invention is excellent in fluidity, and according to the sand, a mold having a high strength and a smooth surface can be obtained.
- the spherical sand of the present invention is roughly composed of two modes.
- the first aspect A 1 2 0 3 Contact And it contains the S i 0 2 as a main component, A 1 2 0 3 / S I_ ⁇ 2 weight ratio is 1 to 1 5, an average particle size of 05-1. 5 mm 0., a flame fusion method It is manufactured spherical sand.
- the second aspect and also contains the A 1 2 ⁇ 3 and S I_ ⁇ 2 as a main component, A 1 2 ⁇ 3 ZS i 0 2 weight ratio of 1 to 15, an average particle size of 0.05 ⁇ 1.5 mm, spherical sand with a sphericity of 0.95 or more.
- the spherical sand of the present invention has a particular feature in that it has a specific component composition and an average particle diameter, and has a large sphericity. With such a configuration, it is possible to produce a mold for manufacturing having excellent fluidity, high strength and a smooth surface. In addition, the mold can be manufactured with a smaller amount of binder than before, and regeneration is easy.
- the spherical shape which is the shape of the spherical sand of the present invention, means a sphericity of 0.88 or more, preferably 0.90 or more.
- the sand is observed with an optical microscope or a digital scope (for example, Keyence Corporation, VH-8000 type). Can be determined.
- Spherical ⁇ sand of the present invention is mainly composed of A 1 2 0 3 and S i 0 2, ⁇ Here, the "main component", A 1 2 0 3 and S i 0 2 is in a total amount It means that 80% by weight or more is contained in all components of the whole sand.
- the A 1 2 ⁇ 3 and the content of S I_ ⁇ 2 is the main component of spherical ⁇ sand of the present invention, from the viewpoint of improvement of fire resistance, as their total amount in the total components in spherical ⁇ sand Preferably, it is 85 to 100% by weight, more preferably 90 to 100% by weight. Further, A 1 2 0 3 ZS I_ ⁇ 2 weight ratio is 1-15. From the viewpoint of improving the fire resistance and the regenerating efficiency of the sand, 1.2 to 12 are preferable, and 1.5 to 9 are more preferable.
- the spherical ⁇ sand present invention as components other than the main component is, for example, CaO, MgO, F e 2 0 3, T I_ ⁇
- K 2 0, Na 2 0 and the like of the metal oxide Things are used as starting materials, for example, derived from the below-mentioned materials.
- CaO and MgO are included, the fire resistance of spherical sand is improved. From the above viewpoint, their content is preferably 5% by weight or less in total.
- Fe 2 ⁇ 3 and Ti ⁇ 2 are contained, their content is preferably 5% by weight or less.
- the content of F e 2 0 3 is 2. More preferably 5 wt% or less, 2 wt% or less is more preferred.
- K 20 and Na 2 ⁇ ⁇ are contained, their total content is preferably 3% by weight or less, more preferably 1% by weight or less.
- the average particle size (mm) of the spherical sand of the present invention is in the range of 0.05 to 1.5 mm. If the thickness is less than 0.05 mm, a large amount of binder is required for the production of mold ⁇ , and it is difficult to regenerate as sand. On the other hand, when the thickness exceeds 1.5 mm, the void ratio of the square type becomes large, which is unfavorable because it leads to a decrease in the square type strength. From the viewpoint of increasing the efficiency of reclaiming spherical sand, the thickness is preferably from 0.075 to 1.5 mm, and from the viewpoint of increasing the mold strength, it is preferably from 0.05 to 1 mm.
- the thickness is more preferably 0.05 to 0.5 mm, and still more preferably 0.05 to 0.35 mm.
- the spherical sand of the present invention is used as skin sand or the like, it is preferable to use the spherical sand with an average particle diameter in the range of 0.01 to 0.1 mm.
- the width of the particle with the minimum interval between the parallel lines is called the minor axis diameter.
- the distance between two parallel lines perpendicular to the parallel line when the particle is inserted is called the major axis diameter.
- the major axis and minor axis of the spherical sand particles are determined by an optical microscope or digital microscope.
- An image (photograph) of the particles can be obtained by using a probe (for example, Model 11-80000, manufactured by Keyence Corporation), and the obtained image can be obtained by image analysis.
- sphericity, by the image obtained image analysis to obtain the peripheral length of the area and the cross section of the particles of the particle projected section, then the same area as the [area of a particle projected section (mm 2) Perimeter (mm)] / [perimeter of the projected cross section of the particle (mm)] is calculated for each of the 50 spherical sand particles. .
- the spherical sand according to the first embodiment of the present invention is obtained by a flame melting method. Therefore, it has a structural feature of high sphericity and denseness. The structural features greatly contribute to the improvement of fluidity, mold strength, and surface smoothness of the manufactured animal.
- the spherical sand of the first embodiment of the present invention preferably has a sphericity of 0.95 or more, more preferably 0.98 or more. Preferably, it is more preferably 0.99 or more. Therefore, as the first state-like spherical ⁇ sand of the present invention, for example, will have free a A 1 2 ⁇ 3 and S I_ ⁇ 2 as a main component, A 1 2 ⁇ 3 ZS i 0 2 weight Preference is given to spherical sand produced by a flame-melting method with a ratio of 1 to 15 and an average particle size of 0.05 to 0.5 mm and a sphericity of 0.95 or more.
- the sphericity of the spherical sand of the second embodiment of the present invention is 0.95 or more. From the viewpoint of improving the fluidity, 0.98 or more is preferable, and 0.99 or more is more preferable.
- the water absorption (% by weight) of the spherical sand of the present invention is determined by suppressing the increase in the amount of binder used due to the absorption of the binder used in the production of the mold into the sand. From the viewpoint of improvement in mold strength and the like, the content is preferably 3% by weight or less, more preferably 0.8% by weight or less, and still more preferably 0.3% by weight or less.
- the water absorption can be measured according to the method of measuring water absorption of fine aggregate of JIS A109.
- the water absorption of spherical sand is generally lower when the sand is prepared by the flame melting method, as long as the sand has the same sphericity as compared with sand prepared by a firing method other than the above method.
- the sphericity of the spherical mineral sand of the present invention is 0.98 or more
- the spherical mineral sand is preferably contained in a mixture with a known fluid sand having low fluidity such as silica sand. If it is contained in an amount of at least volume%, the natural sand comprising the mixture can sufficiently exhibit the desired effects of the present invention.
- the desired effect of the present invention can be exerted according to the amount of addition.
- the effect is remarkable when the spherical sand of the present invention having the predetermined sphericity is contained at 50% by volume or more in the sand of the present invention.
- the content of the spherical sand of the present invention having a sphericity of 0.98 or more in the sand of the mixture is more preferably 60% by volume or more, and further preferably 80% by volume. % Or more.
- the spherical sand of the present invention is particularly preferably one having a sphericity of 0.98 or more, because of its excellent utility.
- natural sand containing 50% by volume or more of such spherical sand can exhibit the same effect as the spherical sand of the present invention, such sand is also included in the present invention.
- the spherical sand of the first embodiment of the present invention is produced by a flame melting method.
- the spherical sand of the second aspect of the present invention can be produced by a known method such as a method of granulating and sintering, and an electro-fusion atomizing method. It is preferable to produce by the flame melting method similarly to the spherical sand of the first embodiment. Therefore, an example of the method for producing spherical sand of the present invention by the flame melting method will be described below. The manufacturing method is also included in the present invention.
- the method of producing spherical ⁇ sand of the present invention includes a step in which powder particles having a diameter of 0.05 to 2 mm are used as a starting material, and the powder particles are melted in a flame to form spheroids.
- the content of the total amount of A 1 2 0 3 and S i 0 2 being the main component, A 1 2 0 3 in the resulting spherical ⁇ sand and S I_ ⁇ From the viewpoint of ensuring that the total amount of 2 is at least 80% by weight of all components, it is preferably at least 75% by weight, more preferably at least 80% by weight, and further preferably at least 8% by weight.
- the average particle size is 0.05 mm or more from the viewpoint of obtaining monodispersed spherical sand, and 2 mm or less from the viewpoint of obtaining sand having a desired sphericity. 0.05 to 2 mm. In addition, from the viewpoint of improving the sphericity of the obtained natural sand, 0.05 to 1.5 mm is preferable.
- the starting material having an average particle size of 0.01 to 0.1 mm is required. It is preferable to use.
- the average particle size of the raw material powder particles may be within the above range since the irregular shaped powder becomes spherical and the particle size decreases, but the particle size of the originally spherical powder does not change.
- the powder particles as the starting material taking into account the component evaporation during melting, A 1 2 0 3 / S I_ ⁇ 2 weight ratio and the average particle size is within the above range To Prepare and use it.
- the water content (% by weight) of the starting material is preferably 10% by weight or less and 3% by weight or less from the viewpoint of adjusting the water absorption and sphericity of the obtained spherical sand to an appropriate range. Is more preferable, and 1% by weight or less is further preferable.
- the water content is measured by weight loss when 10 g of powder particles are heated at 800 ° C. for 1 hour.
- Starting materials can be derived, for example, from refractory mineral and synthetic raw materials.
- the raw material of the A 1 2 ⁇ 3 sources include port one bauxite, alum shale, oxide ⁇ Rumi two ⁇ beam, aluminum hydroxide and the like.
- a raw material of the S I_ ⁇ 2 sources include silica rock, silica sand, quartz, cristobalite, amorphous silica, feldspar, a pyrophyllite and the like.
- a raw material of the (A 1 2 ⁇ 3 + S i 0 2) source kaolin, bread earth shale, bauxite, mica, sillimanite, andalusite, mullite, Zeoraito, montmorillonite, high port site, etc. Can be. These raw materials can be used alone or in combination of two or more.
- the selected starting material is preferably calcined to reduce its water content or to facilitate its melting. Examples of the calcined raw material powder particles include calcined bun page, calcined mullite, calcined bauxite, and a mixture of calcined aluminum hydroxide and kaolin.
- the starting material as described above is dispersed in a carrier gas such as oxygen and injected into the flame to be melted and spheroidized.
- a carrier gas such as oxygen
- it is introduced into the following flame.
- the flame used is generated by burning fuel such as propane, butane, methane, natural liquefied gas, LPG, heavy oil, kerosene, light oil, and pulverized coal with oxygen.
- Fuel Acid The element ratio is preferably 1.01 to 1.3 in terms of volume ratio from the viewpoint of complete combustion. From the viewpoint of generating a high-temperature flame, it is preferable to use an oxygen-gas burner. Although the structure of the burner is not particularly limited, Japanese Patent Application Laid-Open No. 7-48118,
- the following method is suitable for spheroidizing the refractory raw material powder having a large average particle size in the range of 0.05 to 2 mm used in the production method of the present invention.
- the introduction of powder particles into the flame is carried out by dispersing in a carrier gas.
- Oxygen is preferably used as the carrier gas.
- the powder concentration in the gas is preferably from 0.1 to 20 kg / Nm 3 , and more preferably from 0.2 to L Ok gZNm 3 from the viewpoint of ensuring sufficient dispersibility of the powder particles.
- the shape of the raw material powder particles is preferably 9 or less, more preferably 4 or less, from the viewpoint of securing the residence time in the flame and promptly performing melting and spheroidization. And more preferably 2 or less.
- the composition it is particularly preferable that the weight ratio of A OgZS i O 2 is 1.5 to 10 from the viewpoint of obtaining non-fused monodispersed spherical particles.
- the powder particles can be suitably melted and spheroidized even in a plasma jet flame generated by ionizing N 2 inert gas or the like.
- the desired spherical sand of the present invention can be obtained.
- the natural sand has very good fluidity.
- the natural sand and the known natural sand are appropriately mixed so that the spherical natural sand of the present invention is contained at a predetermined ratio. Thereby, the natural sand which can exhibit the same effect as the spherical natural sand of the present invention can be obtained. If these sands are used in the production of molds, the amount of binder used can be reduced, so that the sands can be efficiently regenerated as sands.
- the natural sand composed of the spherical sand of the present invention and a mixture of the natural sand and the known sand include steel, It can be suitably used for type I applications such as iron, aluminum, copper, and alloys thereof. It can also be used as a filler for metals, plastics and the like.
- the mineral sand of the present invention may be used alone or in combination with other known mineral sands such as silica sand and refractory aggregates, clay, water glass, inorganic binders such as silica sol, or furan resin, phenol resin, It can be mixed with an organic binder such as a furan phenol resin and molded using a desired molding die according to a known method.
- the binder is preferably used in an amount of 0.05 to 5 parts by weight based on 100 parts by weight of the natural sand.
- the ⁇ type thus obtained has high strength and a smooth surface. Therefore, when the structure is manufactured by using the manufacturing die, a material having a small surface roughness and a small load on a polishing process as a subsequent process can be obtained.
- the particle density (g cm 3 ) of the natural sand of the present invention is preferably in the range of 1 to 3.5 g / cm 3 from the viewpoint of use in the production of a molding die. If a higher strength type is desired, the particle density is preferably in the range of 2.5 to 3.5 g / cm 3 . In this range, a solid, dense and high-strength ⁇ type can be obtained. When a light-weight type is desired, the particle density is preferably in the range of 1 to 2.5 g / cm 3 . Those in this range are porous, having a space inside, and can be reduced in size. The particle density can be measured according to the particle density measurement method of JISR 1620.
- Structure can be obtained.
- Examples of the structure include a mold, an engine member, a working machine member, a building member, and the like.
- the spherical sand according to the present invention is excellent in various properties required for sand and is industrially useful.
- the molds, structures and structures having excellent properties as described above are included in the present invention.
- a 1 containing 97 wt% in 2 0 3 the total amount of S i 0 2, A 1 2 ⁇ 3 ZS i 0 2 weight ratio is 1.7, water content of 0% by weight, an average particle size of 0. 31 mm
- the starting material is a mullite powder (synthetic mullite powder made by Shibata Ceramics) with a major axis diameter and a minor axis diameter ratio of 1.5, and the powder is used as a carrier gas, and LPG (propane gas) to oxygen ratio. (Capacity ratio) It was thrown into the flame (approximately 2000 ° C) burned in 1.1 to obtain single dispersed spherical green sand.
- Monodispersed spherical sand was obtained in the same manner as in Example 1, except that the average particle size of the starting material was 0.9 mm and the ratio of the major axis to the minor axis was 1.7.
- the resulting ⁇ sand, A 1 2 0 3 and S I_ ⁇ are contained 97 wt% 2 in a total amount, A 1 2 ⁇ 3 / S i 0 2 weight ratio is 1.7, the average particle size was 0.69 mm, the sphericity was 0.97, the water absorption was 0% by weight, and the particle density was 2.8 g / cm 3 .
- a 1 2 ⁇ 3 ZS i 0 2 weight ratio is 2.7, water content 0.1% by weight, average particle diameter 0 Spheroids monodispersed in the same manner as in Example 1, except that the starting material was mullite powder (synthetic mullite powder made by Shibata Ceramics) with a diameter of 25 mm and a major axis diameter / minor axis diameter of 1.3. Got the sand.
- mullite powder synthetic mullite powder made by Shibata Ceramics
- the resulting ⁇ sand, A 1 2 ⁇ 3 and S I_ ⁇ 2 are contained 98 wt% in total amount, A 1 2 0 3 ZS i 0 2 weight ratio is 2.7, the average particle size The sphericity was 0.29 mm, the sphericity was 0.99, the water absorption was 0% by weight, and the particle density was 3.lg / cm 3 .
- Example 4
- a 1 2 3 and S i 0 2 contains 95% by weight of A 1 2 3 and S i 0 2 in total, A 1 2 3 ZS i 0 2 weight ratio is 1.64, water content is 0.2 weight%, and average particle size is 0.
- Monodispersed spherical sand was obtained in the same manner as in Example 1, except that a starting material was sillimanite sand having a diameter of 45 mm and a major axis diameter / minor axis diameter of 1.6.
- a 1 2 ⁇ 3 / S i 0 2 weight ratio 2. 1 hour calcination at 700 ° C a mixture of aluminum hydroxide and force cage down so as to be 5 in an electric furnace, A 1 2 0 3 and S i 0 containing 96 wt% 2 in a total amount, water content 1.9 wt%, average particle diameter of 0. 2 mm, length shaft diameter / minor axis diameter ratio and starting material powder particles of 1.8 A monodisperse spherical sand was obtained in the same manner as in Example 1 except for the above.
- the resulting ⁇ sand, A 1 2 0 3 and S I_ ⁇ 2 are contained 95 wt% in total amount, A 1 2 ⁇ 3 / S I_ ⁇ 2 weight ratio is 2.6, the average particle size 0.19 mm, sphericity 0.97, water absorption 0.1% by weight, particle density 2. It was 7 g's cm 3.
- Example 6
- a 1 2 0 3 / S i 0 2 weight ratio is 1.56, water content 0.1% by weight, average particle diameter 0
- monodispersed spherical sand was obtained in the same manner as in Example 1.
- the resulting sand contains 93% by weight of A 1 2 3 and S i 2 in total, and the weight ratio of A 1 2 3 ZS i 2 is 1.55 and F e 2 3
- the content was 1.7% by weight, the average particle size was 0.14 mm, the sphericity was 0.988, and the water absorption was 0% by weight.
- a 1 2 ⁇ 3 and S I_ ⁇ containing 95 wt% in 2 the total amount, A 1 2 ⁇ 3 ZS i 0 2 weight ratio is 3.36, water content 0.1% by weight, average particle diameter 0.
- monodispersed spherical sand was obtained in the same manner as in Example 1.
- the resulting ⁇ sand, A 1 2 0 3 and S I_ ⁇ 2 are contained 93 wt% in total amount, A 1 2 ⁇ 3 / S i 0 2 weight ratio 3. 35, F e 2 0 3 content is 1.01 wt%, average particle size 0. 12 mm, a sphericity of 0.998, water absorption was 0%.
- a 1 2 containing 0 3 and S I_ ⁇ 91 wt% 2 in a total amount, A 1 2 0 3 / S i 0 2 weight ratio is 9.83, water content 0.1% by weight, average particle diameter 0
- monodispersed spherical sand was obtained in the same manner as in Example 1.
- the resulting ⁇ sand, A 1 2 ⁇ 3 and S i 0 2 and contained 91.5 wt% in total amount, A 1 2 0 3 ZS i 0 2 weight ratio is 9. 39, F e 2 ⁇ 3 contained The amount was 1.87% by weight, the average particle size was 0.13 mm, the sphericity was 0.996, and the water absorption was 0% by weight.
- a 1 2 containing 0 3 and 95% by weight of S I_ ⁇ 2 in a total amount, A 1 2 ⁇ 3 ZS I_ ⁇ 2 weight ratio is 2.21, water content 0 wt%, average particle diameter of 0. 16 mm, Using a calcined mullite powder having a major axis diameter and a minor axis diameter ratio of 1.4 as a starting material, monodispersed spherical sand was obtained in the same manner as in Example 1. The resulting ⁇ sand, A 1 2 ⁇ 3 and S I_ ⁇ 2 and contains 95.3 wt% in total amount, A 1 2 ⁇ 3 ZS i 0 2 weight ratio is 2. 19, Fe 2 ⁇ 3 content is 1.21 wt%, average particle size 0. 13 mm, a sphericity of 0.995, water absorption was 0%. Comparative Example 1
- A1 2 ⁇ 3 ZS i 0 2 Spherical powder particles (A 1 2 ) were prepared by mixing aluminum hydroxide and force oil so that the weight ratio would be 2.7, and using a spray drier to obtain an average particle size of 0.2 mm. 0 3 and to obtain spherical ⁇ sand by baking 1 hour at 1500 ° C in a total amount of 96 wt.% containing) the S I_ ⁇ 2 in an electric furnace.
- Fig. 2 shows a photograph (magnification: 100x) of a reflection microscope (manufactured by Nikon Corporation) of the sand. From the figure, it can be seen that the shape of the natural sand particles has a low spheroidization rate and low sphericity. Comparative Example 2
- Spherical powder sand was obtained in the same manner as in Example 1, except that the starting material was powder particles containing 97% by weight, a water content of 2.9% by weight, and an average particle size of 0.2 mm.
- the resulting ⁇ sand, A 1 2 ⁇ 3 and S I_ ⁇ 2 are contained 97 wt% in total amount, A l 2 0 3 / S i 0 2 weight ratio is 26, average particle diameter 0 19 mm, sphericity 0.88, water absorption 1% by weight, particle density 3.3 gZ cm 3 . Comparative Example 3
- Raw sand was obtained in the same manner as in Example 1 using silica sand (amorphous) having a Si 2 content of 99% by weight and an average particle size of 0.13 mm as a starting material.
- the resulting sand was irregular in shape and had a water absorption of 0.1% by weight.
- the flow time (seconds) was determined using a JIS K6721 funnel. The shorter the flow time, the better the flowability.
- the animal surface after demolding from the type III was evaluated by visual observation, and the evaluation result was used as the evaluation result of the type III surface skin. That is, if the state of the surface of the animal is smooth, the surface of the ⁇ type is also smooth.
- the ferrite was prepared by melting iron FC-250 at 1400 ° C. in a high-frequency furnace to prepare a rectangular solid having a shape of 5 OmmX 5 OmmX 40 Omm.
- Example 9 Same as Test Example 1 except that the natural sands obtained in Example 9 and Comparative Examples 1 and 4 were used, and the binder was Power Oliteener 3400 B (manufactured by Kao Quaker).
- the strength test was carried out with a lapse of time of 0.5 to 24 hours, and Fig. 3 shows the results of a time-dependent strength test of the molds prepared from the marine sands.
- the die strength reached practical strength (about 2 MPa) in a short time, so that demolding could be performed quickly and work efficiency was improved.
- Table 3 shows that the sands of Examples 3 and 9 are superior to the sands of Comparative Examples 1 and 4 in crush resistance. Therefore, the amount of the binder to be used can be reduced, the amount of residual carbon in the sand after use is small, and the cultivation and regeneration can be easily performed. Since the sand is not powdered (removed into abrasion powder) in the cultivation regeneration, the sands of Examples 3 and 9 can be said to have excellent regeneration efficiency. Test example 4
- Natural sand consisting of 50% by volume of the natural sand of Example 3 and 50% by volume of the natural sand of Comparative Example 1, and 80% by volume of the natural sand of Example 9 and 50% by volume of the natural sand of Comparative Example 4. 20% by volume of natural sands were obtained and tested according to Test Example 1. As a result, the natural sands had excellent fluidity, and were obtained from the natural sands. The mold was excellent in strength and had a smooth surface skin.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US10/537,833 US7673668B2 (en) | 2002-12-09 | 2003-12-09 | Spherical casting sand |
DE60315076.4T DE60315076T3 (de) | 2002-12-09 | 2003-12-09 | Kugelgusssand |
AU2003289258A AU2003289258A1 (en) | 2002-12-09 | 2003-12-09 | Spherical casting sand |
EP03777376.9A EP1595617B2 (en) | 2002-12-09 | 2003-12-09 | Spherical casting sand |
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JP2002357344 | 2002-12-09 | ||
JP2002-357344 | 2002-12-09 |
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WO2004052572A1 true WO2004052572A1 (ja) | 2004-06-24 |
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PCT/JP2003/015704 WO2004052572A1 (ja) | 2002-12-09 | 2003-12-09 | 球状鋳物砂及び製造方法 |
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Country | Link |
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US (1) | US7673668B2 (ja) |
EP (1) | EP1595617B2 (ja) |
KR (1) | KR100998461B1 (ja) |
CN (1) | CN1308099C (ja) |
AU (1) | AU2003289258A1 (ja) |
DE (1) | DE60315076T3 (ja) |
WO (1) | WO2004052572A1 (ja) |
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EP1652828A1 (en) * | 2004-11-02 | 2006-05-03 | Kao Corporation | Ceramic particles |
EP1844877A4 (en) * | 2005-02-02 | 2008-10-08 | Kao Corp | BALL-SHAPED SAND |
US8217106B2 (en) * | 2005-08-03 | 2012-07-10 | Kao Corporation | Optical diffusible material |
CN103693948A (zh) * | 2004-09-24 | 2014-04-02 | 日本碍子株式会社 | 堇青石质蜂窝结构体的制造方法 |
CN114799036A (zh) * | 2022-04-29 | 2022-07-29 | 阳泉中昂新材料科技有限公司 | 一种精密铸造用面层粉剂及其制备方法 |
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- 2003-12-09 US US10/537,833 patent/US7673668B2/en not_active Expired - Fee Related
- 2003-12-09 KR KR1020057010439A patent/KR100998461B1/ko active IP Right Grant
- 2003-12-09 EP EP03777376.9A patent/EP1595617B2/en not_active Expired - Lifetime
- 2003-12-09 DE DE60315076.4T patent/DE60315076T3/de not_active Expired - Lifetime
- 2003-12-09 CN CNB2003801054263A patent/CN1308099C/zh not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
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EP1595617A1 (en) | 2005-11-16 |
CN1723094A (zh) | 2006-01-18 |
EP1595617A4 (en) | 2006-03-08 |
AU2003289258A1 (en) | 2004-06-30 |
US20060005937A1 (en) | 2006-01-12 |
CN1308099C (zh) | 2007-04-04 |
DE60315076T2 (de) | 2008-04-10 |
KR100998461B1 (ko) | 2010-12-06 |
DE60315076T3 (de) | 2015-03-05 |
EP1595617B2 (en) | 2014-11-26 |
DE60315076D1 (de) | 2007-08-30 |
US7673668B2 (en) | 2010-03-09 |
EP1595617B1 (en) | 2007-07-18 |
KR20050088114A (ko) | 2005-09-01 |
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