WO2022224368A1 - 放熱部材およびヒートシンク - Google Patents
放熱部材およびヒートシンク Download PDFInfo
- Publication number
- WO2022224368A1 WO2022224368A1 PCT/JP2021/016119 JP2021016119W WO2022224368A1 WO 2022224368 A1 WO2022224368 A1 WO 2022224368A1 JP 2021016119 W JP2021016119 W JP 2021016119W WO 2022224368 A1 WO2022224368 A1 WO 2022224368A1
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- WIPO (PCT)
- Prior art keywords
- metal oxide
- heat
- metal
- doped
- ceramic material
- Prior art date
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- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 183
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 183
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 83
- 229910052751 metal Inorganic materials 0.000 claims abstract description 60
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- 230000017525 heat dissipation Effects 0.000 claims abstract description 37
- 239000013078 crystal Substances 0.000 claims abstract description 14
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/453—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 zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates
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- C—CHEMISTRY; METALLURGY
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- C04B35/62222—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
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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
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- C04B35/638—Removal thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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- C04B35/64—Burning or sintering processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
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- F28F2245/00—Coatings; Surface treatments
- F28F2245/06—Coatings; Surface treatments having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Definitions
- the present disclosure relates to heat dissipation members and heat sinks used to dissipate heat from electrical equipment and electronic equipment.
- heat dissipation technology is becoming more important due to the increase in heat generation due to higher output.
- heat dissipation technology is becoming more important due to the increase in heat generation due to higher output.
- air convection such as in-vehicle electrical equipment that is used in a sealed housing for dust and water resistance, space equipment that is used in a vacuum, and the like.
- conventional heat dissipation techniques such as natural air cooling with an aluminum heat sink and forced air cooling with an electric fan cannot achieve a sufficient heat dissipation effect.
- Patent Literature 1 proposes a heat dissipation member that absorbs heat generated by an electronic device and releases it to the outside.
- the heat dissipating member described in Patent Literature 1 has a substrate and a coating that covers at least a part of the surface of the substrate.
- the coating contains at least one of a metal oxide represented by M x L 3-x O 4 and ZnO, and has a porous structure in which a plurality of needle-like or plate-like crystals are arranged in a mesh or pincushion shape.
- M x L 3-x O 4 M ⁇ L
- M is selected from the group consisting of Mg, Fe, Zn, Mn, Cu, Co, Cr and Ni
- L is Co, Al, Fe and is selected from the group consisting of Cr, and x satisfies 0 ⁇ x ⁇ 1;
- the average emissivity is 70% or more in the wavelength range of 3 ⁇ m or more and 25 ⁇ m or less.
- the emissivity is 80% or more in the wavelength range of 2 ⁇ m to 15 ⁇ m, but the emissivity drops sharply in the wavelength region exceeding 15 ⁇ m. Therefore, in the heat dissipating member described in Embodiment 1, heat radiation is insufficient in a wavelength region longer than 15 ⁇ m, and it is difficult to achieve an average emissivity of 70% or more in a wavelength region of 3 ⁇ m or more and 25 ⁇ m or less. there were. In other words, when the heat dissipating member described in Patent Document 1 is used as a heat dissipating member or a ceramic heat sink for electrical and electronic equipment, sufficient cooling performance may not be obtained. Improvement was required.
- the present disclosure has been made in view of the above, and an object thereof is to obtain a heat radiating member capable of improving the cooling performance of an electric/electronic device compared to the conventional one.
- the present disclosure provides a heat dissipation member comprising a thermal radiation ceramic material, wherein the thermal radiation ceramic material is a metal oxide having a wurtzite crystal structure.
- the thermal radiation ceramic material is a metal oxide having a wurtzite crystal structure.
- 1 metal oxide as a main component and includes a second metal oxide, which is a metal oxide having an average emissivity of 70% or more in a wavelength region of 3 ⁇ m or more and 25 ⁇ m or less.
- the second metal oxide is a trivalent metal-doped metal oxide in which some metal atoms of the first metal oxide are replaced with trivalent metal atoms and a monovalent metal-doped metal oxide in which some metal atoms are replaced with monovalent metal atoms. Including at least one of things.
- Sectional view schematically showing an example of the heat dissipation member according to Embodiment 1 A diagram schematically showing an example of a wurtzite crystal structure A diagram schematically showing an example of the crystal structure of a trivalent metal-doped metal oxide A diagram schematically showing an example of the crystal structure of a monovalent metal-doped metal oxide Sectional view schematically showing another example of the heat dissipation member according to Embodiment 1 Sectional view schematically showing another example of the heat dissipation member according to Embodiment 1 BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows typically an example of a structure of the electric electronic device containing the heat radiating member which concerns on Embodiment 1.
- FIG. 2 is a diagram showing an example of raw materials for heat radiating members, heat radiating ceramic materials, and heat radiating properties in Examples 1 to 10 and Comparative Examples 1 and 2;
- FIG. 1 is a cross-sectional view schematically showing an example of a heat radiating member according to Embodiment 1.
- the heat dissipating member 1 is made of a heat emitting ceramic material 10 containing metal oxide particles 11 , trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles 13 .
- metal oxide particles 11 correspond to first metal oxide particles
- trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles 13 correspond to second metal oxide particles. do.
- the heat radiation member 1 made of the heat radiation ceramic material 10 exhibits a cooling effect by radiating heat generated from a heat source such as a semiconductor element to the outside by radiation of infrared rays. For this reason, it is preferable that the heat emitting ceramic material 10 has as high an emissivity as possible.
- the emissivity of ceramic materials is determined by the emission spectrum specific to the electronic structure of each material, and there are wavelength regions with high emissivity and low emissivity regions. For this reason, it is generally difficult to increase the average emissivity of a single ceramic material, which is the average emissivity in all infrared wavelength regions.
- the heat radiation ceramic material 10 constituting the heat radiation member 1 contains metal oxide particles 11 having a wurtzite crystal structure having a relatively high emissivity as a main component, and It contains at least one of trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles 13 with different spectra.
- the heat radiation ceramic material 10 constituting the heat radiation member 1 contains metal oxide particles 11 having a wurtzite crystal structure having a relatively high emissivity as a main component, and It contains at least one of trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles 13 with different spectra.
- the heat radiation ceramic material 10 constituting the heat radiation member 1 contains metal oxide particles 11 having a wurtzite crystal structure having a relatively high emissivity as a main component, and It contains at least one of trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles 13 with different spectra.
- the infrared region covered by this specification is the wavelength region of 3 ⁇ m or more and 25 ⁇ m or less. Further, the average emissivity is the average value of each emissivity in the infrared wavelength range of 3 ⁇ m or more and 25 ⁇ m or less.
- the heat radiation ceramic material 10 that constitutes the heat radiation member 1 contains metal oxide particles 11 as a main component.
- Metal oxide particles 11 contain a metal oxide having a wurtzite crystal structure.
- FIG. 2 is a diagram schematically showing an example of a wurtzite crystal structure.
- a metal oxide 100 having a wurtzite crystal structure has a structure in which metal atoms 101 and oxygen atoms 102 are bonded in a ratio of 1:1 and arranged regularly.
- metal oxide 100 having a wurtzite crystal structure is referred to as wurtzite metal oxide 100 .
- the wurtzite-type metal oxide 100 has an electronic structure that provides high emissivity in the infrared region, and is therefore suitable as the heat emitting ceramic material 10 .
- An example of a wurtzite-type metal oxide 100 is beryllium oxide (BeO) or zinc oxide (ZnO).
- the wurtzite-type metal oxide 100 is preferably ZnO from the viewpoint of cost and ease of manufacture.
- the wurtzite-type metal oxide 100 corresponds to the first metal oxide.
- the thermal radiation ceramic material 10 that constitutes the heat radiation member 1 preferably contains at least one of the trivalent metal-doped metal oxide particles 12 and the monovalent metal-doped metal oxide particles 13 .
- Trivalent metal-doped metal oxide particles 12 comprise a trivalent metal-doped metal oxide.
- FIG. 3 is a diagram schematically showing an example of the crystal structure of a trivalent metal-doped metal oxide.
- the trivalent metal-doped metal oxide 110 is obtained by substituting some of the metal atoms 101 of the wurtzite-type metal oxide 100 with trivalent metal atoms 111, as shown in FIG.
- the electronic structure of the wurtzite-type metal oxide 100 is changed, and the emissivity on the short wavelength side of 10 ⁇ m or less in the wavelength region of 3 ⁇ m or more and 25 ⁇ m or less is improved.
- the emissivity on the short wavelength side where energy is high improvement in the heat dissipation performance of the heat dissipation member 1 as a whole can be expected.
- the trivalent metal-doped metal oxide 110 is included in the heat dissipating member 1, the number of carriers that conduct heat increases, so an effect of improving the thermal conductivity of the heat dissipating member 1 can be expected.
- Trivalent metal-doped metal oxide 110 corresponds to the second metal oxide.
- the trivalent metal atom 111 is preferably aluminum (Al) or gallium (Ga). From an economical point of view, Al is more preferable. By using Al or Ga, it is possible to replace the metal atoms 101 of the wurtzite-type metal oxide 100 . In particular, when the wurtzite-type metal oxide 100 is ZnO, Zn, which is the metal atom 101, can be relatively easily replaced with Al or Ga, thereby improving productivity.
- the substitution amount of the trivalent metal atom 111 is not particularly limited, but is preferably 0.1 mol % or more and 5 mol % or less, more preferably 0.2 mol % or more and 3 mol % or less. By setting the substitution amount of the trivalent metal atoms 111 within such a range, the effect of improving the emissivity on the short wavelength side is further improved, which is preferable.
- the monovalent metal-doped metal oxide particles 13 contain a monovalent metal-doped metal oxide.
- FIG. 4 is a diagram schematically showing an example of the crystal structure of a monovalent metal-doped metal oxide.
- Monovalent metal-doped metal oxide 120 is obtained by substituting some metal atoms 101 of wurtzite-type metal oxide 100 with monovalent metal atoms 121, as shown in FIG. By including the monovalent metal-doped metal oxide 120, the electronic structure of the wurtzite-type metal oxide 100 is changed, and the emissivity on the long wavelength side of 10 ⁇ m or more in the wavelength region of 3 ⁇ m or more and 25 ⁇ m or less is improved.
- Monovalent metal-doped metal oxide 120 corresponds to the second metal oxide.
- the monovalent metal atom 121 is preferably lithium (Li) or sodium (Na). By using Li or Na, it becomes possible to replace the metal atoms 101 of the wurtzite-type metal oxide 100 . In particular, when the wurtzite-type metal oxide 100 is ZnO, Zn, which is the metal atom 101, can be relatively easily replaced with Li or Na, thereby improving productivity.
- the substitution amount of the monovalent metal atom 121 is not particularly limited, but is preferably 0.2 mol % or more and 10 mol % or less, more preferably 0.5 mol % or more and 8 mol % or less. By setting the substitution amount of the monovalent metal atoms 121 within such a range, the effect of improving the emissivity on the long wavelength side is further improved, which is preferable.
- the average emissivity of the trivalent metal-doped metal oxide 110 and the monovalent metal-doped metal oxide 120 in the infrared wavelength region of 3 ⁇ m or more and 25 ⁇ m or less is 70% or more, respectively.
- the heat dissipation member 1 having a high average emissivity of the heat emitting ceramic material 10 can be obtained.
- the heat dissipation member 1 contains both the trivalent metal-doped metal oxide 110 and the monovalent metal-doped metal oxide 120, the emissivity is improved on both the short wavelength side and the long wavelength side with respect to 10 ⁇ m. Therefore, even higher heat dissipation performance can be expected.
- the thermal radiation ceramic material 10 of FIG. 1 is a sintered body in which trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles 13 are dispersed in wurtzite-type metal oxide particles 11. is shown.
- FIG. 5 and 6 are cross-sectional views schematically showing other examples of the heat radiating member according to Embodiment 1.
- FIG. The same components as those in FIG. 1 are denoted by the same reference numerals, and descriptions thereof are omitted. If the effect of improving the average emissivity of the heat dissipating member 1 is obtained, the heat dissipating member 1 has the trivalent metal-doped metal oxide particles 12 and the monovalent metal-doped metal oxide particles 13 as shown in FIG. It may be sintered bodies randomly dispersed in the ceramic material 10 .
- the heat dissipation member 1 has trivalent metal-doped metal oxide particles 12 dispersed inside the thermal radiation ceramic material 10 and monovalent metal-doped metal particles near the surface of the thermal radiation ceramic material 10 .
- It may be a sintered body in which oxide particles 13 are arranged.
- the surface on which the monovalent metal-doped metal oxide particles 13 are arranged may be the entire surface near the surface of the sintered body, or only a part of the surface near the surface. That is, it is sufficient that the monovalent metal-doped metal oxide particles 13 are arranged on at least part of the surface of the sintered body.
- the thickness in the depth direction near the surface where the monovalent metal-doped metal oxide particles 13 are arranged is not particularly limited, and may be appropriately determined in consideration of the thickness and shape of the heat dissipation member 1 .
- An example of the thickness in the depth direction near the surface where the monovalent metal-doped metal oxide particles 13 are arranged is preferably 1 mm or less, more preferably 0.5 mm or less.
- FIG. 5 shows the case where the trivalent metal-doped metal oxide particles 12 are dispersed inside the heat emitting ceramic material 10, even if the trivalent metal-doped metal oxide particles 12 are not contained, good.
- the first layer 21 containing the trivalent metal-doped metal oxide particles 12 and the second layer 22 containing the monovalent metal-doped metal oxide particles 13 form a laminated structure. It may be.
- the first layer 21 is a layer of wurtzite-type metal oxide particles 11 containing trivalent metal-doped metal oxide particles 12
- the second layer 22 is a wurtzite-type metal oxide particle 11 containing monovalent metal-doped metal oxide particles 13 .
- This layer is made of ore-type metal oxide particles 11 .
- the laminated structure of each layer and the thickness of each layer are not particularly limited, and may be appropriately determined in consideration of the thickness and shape of the heat dissipation member 1 .
- the heat dissipation member 1 shown in FIGS. 1, 5 and 6 includes wurtzite-type metal oxide particles 11, trivalent metal-doped metal oxide particles 12, and monovalent metal-doped metal oxide particles 13. , was shown. However, as described above, the heat dissipation member 1 includes the wurtzite-type metal oxide particles 11 and at least one of the trivalent metal-doped metal oxide particles 12 and the monovalent metal-doped metal oxide particles 13. should be
- the porosity of the heat radiation ceramic material 10 that constitutes the heat radiation member 1 is related to the thermal conductivity and mechanical strength of the heat radiation member 1 . That is, if the porosity of the heat emitting ceramic material 10 is too high, the voids are connected inside the heat emitting ceramic material 10, resulting in a decrease in mechanical strength. In addition, since the air layer in the voids serves as a heat insulator, heat transfer is hindered, resulting in a decrease in thermal conductivity. Therefore, the porosity of the thermally radiating ceramic material 10 forming the heat radiating member 1 is preferably 40% or less from the viewpoint of obtaining desired thermal conductivity and mechanical strength. Moreover, the porosity of the thermally radiating ceramic material 10 constituting the heat radiating member 1 is more preferably 35% or less, more preferably 30% or less.
- the porosity of the heat emitting ceramic material 10 used in this specification will be explained.
- the porosity can be calculated from the following equation (1) using measured values of the mass and dimensions of the heat radiation ceramic material 10 cut into a rectangular parallelepiped shape.
- the dimensions of the rectangular parallelepiped thermal radiation ceramic material 10 are length, width and height.
- Porosity ⁇ 1-[W dry / (L ⁇ W ⁇ T) / ⁇ theory ] ⁇ ⁇ 100 (1)
- W dry is the mass [g] of the thermal radiation ceramic material 10 dried at 150° C. for 2 hours.
- L, W and T are the length [cm] of the rectangular parallelepiped heat-radiating ceramic material 10
- ⁇ theory is the length of the heat-radiating ceramic material 10. It is the theoretical density [g/cm 3 ].
- the average emissivity of the thermally radiating ceramic material 10 constituting the heat radiating member 1 is 70% or more, preferably 75% or more, and even more preferably 80% or more.
- the emissivity of the thermal radiation ceramic material 10 varies with temperature, but in the temperature range of 200° C. or less, preferably 150° C. or less, which is normally used as the heat radiation member 1 of electrical and electronic equipment, the emissivity is 70% or more. If the material has an average emissivity, sufficient cooling performance can be obtained as the heat dissipating member 1 .
- the thermal conductivity of the heat emitting ceramic material 10 is preferably 20 W/(m ⁇ K) or more, more preferably 30 W/(m ⁇ K) or more. This is because if the thermal conductivity is 20 W/(m ⁇ K) or more, the heat generated from the heat source is efficiently transferred to the heat dissipating member 1, so that even higher cooling performance can be expected.
- Wurtzite-type metal oxide particles 11, trivalent metal-doped metal oxide particles 12, and monovalent metal-doped metal oxide particles 13, which constitute heat radiating member 1 are not particularly limited in particle size, but radiate It is preferably smaller than the infrared wavelength.
- the average particle size is preferably 15 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 5 ⁇ m or less.
- the average particle size of each particle in the thermal radiation ceramic material 10 can be obtained by observing the cross section of the thermal radiation ceramic material 10 with a scanning electron microscope (SEM). Specifically, after cutting the thermal radiation ceramic material 10 and magnifying the cross section with an SEM, for example, by 15,000 times, the major diameters of at least 20 particles are measured, and the measured values are averaged. Particle size can be obtained.
- SEM scanning electron microscope
- the heat radiation ceramic material 10 that constitutes the heat dissipation member 1 can contain various components known in the art in order to obtain desired effects in addition to the above components.
- the content of the component in the thermally radiating ceramic material 10 constituting the heat radiating member 1 of Embodiment 1 is not particularly limited as long as it does not impair the effects of the embodiment.
- the heat dissipating member 1 made of the heat emitting ceramic material 10 according to Embodiment 1 can be used as a heat dissipating measure for electrical and electronic equipment, and specifically, applications such as heat sinks, heat spreaders, and heat dissipating substrates are assumed.
- FIG. 7 is a cross-sectional view schematically showing an example of the configuration of an electrical/electronic device including the heat radiating member according to Embodiment 1.
- FIG. an example in which the heat dissipation member 1 is used as a heat sink for an electric/electronic device 50 is shown.
- An electric/electronic device 50 includes a circuit board 51, a semiconductor element 53 mounted on the circuit board 51 via a metal bonding material 52, and a heat dissipation member 1 according to Embodiment 1 arranged so as to be in contact with the semiconductor element 53. , provided.
- the heat dissipating member 1 has a flat plate shape, and is provided so as to be in contact with the entire surface of the semiconductor element 53 opposite to the surface on the circuit board 51 side. With such a configuration, the heat generated from the semiconductor element 53 can be efficiently discharged to the outside through the heat dissipation member 1, thereby improving heat dissipation.
- the heat radiating member 1 when used as a heat sink, it is preferable that at least one side surface of the plate-like heat sink has unevenness whose height difference is equal to or greater than the wavelength of the radiated infrared rays. Specifically, the unevenness has a height difference of 25 ⁇ m or more. Moreover, it is preferable that the unevenness has a height difference of 30 ⁇ m or more.
- the effective surface area for infrared radiation increases. This improves the apparent average emissivity and improves the cooling performance of the heat sink.
- the heat dissipation member 1 according to Embodiment 1 can be manufactured using a method known in the technical field.
- the heat dissipation member 1 according to Embodiment 1 can be manufactured as follows.
- a slurry preparation step is performed in which ZnO powder, alumina (Al 2 O 3 ) powder, lithium carbonate (Li 2 CO 3 ) powder, a dispersant, a binder and water are mixed to prepare a slurry.
- the average particle size of the ZnO powder, Al 2 O 3 powder and Li 2 CO 3 powder is not particularly limited, but is preferably 1 ⁇ m or less, more preferably 0.8 ⁇ m or less, and 0.5 ⁇ m or less. is more preferred. If the average particle size of each powder exceeds 1 ⁇ m, unreacted atoms tend to remain during the substitution reaction of Zn atoms of ZnO with Al atoms or Li atoms, making it difficult to obtain a uniform composition. For this reason, the improvement of the cooling performance of the manufactured heat radiating member 1 may be hindered.
- the dispersant is not particularly limited as long as it can be used for aqueous slurry, and those known in the art can be used.
- examples of dispersants include anionic surfactants such as alkyl sulfates, polyoxyethylene alkyl ether sulfates, alkylbenzene sulfonates, reactive surfactants, fatty acid salts, naphthalenesulfonic acid formalin condensates; Cationic surfactants such as amine salts, quaternary ammonium salts, amphoteric surfactant alkylbetaines, alkylamine oxides; polyoxyethylene alkyl ethers, polyoxyalkylene derivatives, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acids
- Nonionic surfactants such as esters, polyoxyethylene sorbitol fatty acid esters, glycerin fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene fatty acid castor oils, poly
- the binder is not particularly limited, and those known in the art can be used.
- binders include acrylic, cellulose, polyvinyl alcohol, polyvinyl acetal, urethane, and vinyl acetate resins. These can be used singly or in combination of two or more.
- Water is not particularly limited, and pure water, RO (Reverse Osmosis) water, deionized water, etc. can be used.
- RO Reverse Osmosis
- Mixing when preparing the slurry is not particularly limited, and can be performed using a method known in the art.
- mixing methods include methods using a kneader, ball mill, planetary ball mill, kneading mixer, and bead mill.
- a granulated powder preparation step of granulating the slurry to prepare granulated powder is carried out.
- the granulation method is not particularly limited, and can be carried out according to methods known in the art.
- granulated powder can be obtained by spray drying using a spray dryer or the like. Conditions for spray drying are not particularly limited and may be appropriately adjusted according to the equipment used.
- a molded body production step is performed in which a mold having a desired shape is filled with granulated powder and pressure-molded to produce a molded body.
- a desired shape is a flat plate shape.
- the pressure molding method is not particularly limited, and can be carried out according to methods known in the art. Examples of pressure molding methods include cold isostatic pressing (CIP) molding, warm isostatic pressing (WIP) molding, and uniaxial pressure molding.
- the pressure during pressure molding may be appropriately adjusted according to the type of granulated powder, the equipment used, etc., and is not particularly limited, but is generally 30 MPa or more and 500 MPa or less.
- a degreasing process for degreasing the compact is carried out.
- the method of degreasing treatment is not particularly limited, and can be carried out according to methods known in the art.
- the degreasing treatment can be performed by heat-treating the compact in an air atmosphere.
- the heating temperature is not particularly limited as long as it is a temperature at which the binder can be thermally decomposed, and is generally 300° C. or higher and 800° C. or lower.
- a firing step is performed to fire the compact after degreasing.
- the firing method is not particularly limited, and can be carried out according to methods known in the art.
- the compact after degreasing is fired in an air atmosphere.
- the firing temperature is not particularly limited, it is generally 1100° C. or higher and 1500° C. or lower, preferably 1200° C. or higher and 1400° C. or lower, and more preferably 1250° C. or higher and 1350° C. or lower.
- a grinding process may be carried out to grind the surface of the molded body after sintering.
- the grinding method is not particularly limited, and can be carried out according to methods known in the art.
- One example of the grinding method is grinding using a diamond bit.
- the heat dissipating member 1 in which the trivalent metal-doped metal oxide particles 12 and the monovalent metal-doped metal oxide particles 13 are dispersed in the wurtzite-type metal oxide particles 11 shown in FIG. 1 is manufactured.
- a slurry is prepared with a composition that does not contain the Li 2 CO 3 powder, and the above-described granulated powder preparation step and subsequent steps are carried out to prepare a molded body after sintering.
- a Li 2 CO 3 powder application step is carried out to apply Li 2 CO 3 powder to the surface of the obtained molded body after sintering.
- the Li 2 CO 3 powder is applied to at least part of the surface of the compact.
- a heat treatment step is carried out in which the compact having the surface coated with the Li 2 CO 3 powder is heat treated in an air atmosphere using an electric furnace.
- the heat treatment temperature may be a temperature at which the Li 2 CO 3 powder is thermally decomposed and the lithium atoms are thermally diffused into the ZnO.
- the heat radiating member 1 shown in FIG. 5 is manufactured.
- a heat dissipation device having a laminated structure of a first layer 21 containing trivalent metal-doped metal oxide particles 12 and a second layer 22 containing monovalent metal-doped metal oxide particles 13.
- a method for manufacturing the member 1 will be described.
- a slurry preparation step a slurry containing no Li 2 CO 3 powder and a slurry containing no Al 2 O 3 powder are prepared.
- a predetermined amount of granulated powder not containing Li 2 CO 3 particles and a predetermined amount of Al 2 O 3 powder particles are placed in a mold having a desired shape. and a granulated powder not blended with are alternately filled and pressure-molded to produce a compact.
- the steps after the degreasing treatment step described above are carried out to produce a molded body after sintering.
- the heat dissipating member 1 shown in FIG. 6 can also be manufactured by another method.
- a slurry containing no Li 2 CO 3 powder is used to produce green sheets, and a slurry containing no Al 2 O 3 powder is used to produce green sheets.
- a green sheet is an unfired sheet containing raw powder of a ceramic material as a component. Then, green sheets containing no Li 2 CO 3 powder and green sheets containing no Al 2 O 3 powder are alternately laminated, then degreased and fired.
- the heat dissipation member 1 according to Embodiment 1 contains a wurtzite-type metal oxide 100 as a main component, and is a trivalent metal-doped metal oxide having an average emissivity of 70% or more in a wavelength region of 3 ⁇ m or more and 25 ⁇ m or less. 110 and at least one of monovalent metal-doped metal oxide 120 .
- the wurtzite-type metal oxide 100 has an electronic structure that provides high emissivity in the wavelength range of 3 ⁇ m to 25 ⁇ m.
- the electronic structure of the wurtzite-type metal oxide 100 is changed, and the emissivity on the short wavelength side of 10 ⁇ m or less in the infrared region is improved.
- the heat dissipation member 1 contains the monovalent metal-doped metal oxide 120, the electronic structure of the wurtzite metal oxide 100 is changed, and the emissivity on the long wavelength side of 10 ⁇ m or more in the infrared region is improved. This improves the average emissivity of the heat dissipating member 1 in the wavelength range of 3 ⁇ m to 25 ⁇ m, and the heat dissipating member 1 having excellent cooling performance compared to the conventional one can be obtained.
- FIG. 8 is a cross-sectional view schematically showing an example of the configuration of a heat radiating member according to Embodiment 2.
- FIG. below portions different from the first embodiment will be described.
- symbol is attached
- the heat radiating member 1 according to Embodiment 2 includes a base material 71 and a coating layer 72 that is coated on the surface of the base material 71 and contains the heat radiation ceramic material 10 .
- the coating layer 72 contains fillers 73 and binders 74 .
- Filler 73 contains, as a main component, wurtzite-type metal oxide particles 11 having a relatively high emissivity, similarly to heat-radiating ceramic material 10 constituting heat-dissipating member 1 of Embodiment 1, and has a radiation spectrum of contains at least one of trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles 13 that are different from each other.
- 9 to 11 are cross-sectional views schematically showing an example of the configuration of a filler that is a heat radiating member according to Embodiment 2.
- FIG. 9 shows a filler 73 of a heat emitting ceramic material 10 composed of wurtzite-type metal oxide particles 11, trivalent metal-doped metal oxide particles 12, and monovalent metal-doped metal oxide particles 13. It is shown.
- FIG. 10 shows a filler 73 of a heat emitting ceramic material 10 composed of wurtzite-type metal oxide particles 11 and trivalent metal-doped metal oxide particles 12 .
- FIG. 11 shows a filler 73 of a heat emitting ceramic material 10 composed of wurtzite-type metal oxide particles 11 and monovalent metal-doped metal oxide particles 13 .
- the fillers 73 of the heat emitting ceramic material 10 shown in FIGS. 9 to 11 may be used alone, or two or more fillers 73 may be used in combination.
- the trivalent metal-doped metal oxide particles 12 As in the case of the heat emitting ceramic material 10 constituting the heat dissipating member 1 of Embodiment 1. More preferably, both valent metal-doped metal oxide particles 13 and trivalent metal-doped metal oxide particles 12 are included.
- the binder 74 contained in the coating layer 72 is not particularly limited as long as it has the function of uniformly dispersing the filler 73 of the heat emitting ceramic material 10 and fixing it as the coating layer 72 .
- As the binder 74 contained in the coating layer 72 for example, an organic binder or an inorganic binder can be appropriately selected and used.
- One index for selecting the binder 74 is heat resistance. That is, the binder 74 having desired heat resistance is appropriately selected depending on the temperature at which the heat radiating member 1 is used.
- the organic binder is not particularly limited, but examples include epoxy resin, unsaturated polyester resin, phenol resin, melamine resin, silicone resin, polyimide resin, and the like.
- the epoxy resin is preferable because of its excellent adhesiveness.
- examples of epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, orthocresol novolac type epoxy resins, phenol novolac type epoxy resins, alicyclic aliphatic epoxy resins, glycidyl-aminophenol type epoxy resins, and the like. . These resins can be used singly or in combination of two or more.
- examples of curing agents include alicyclic acid anhydrides such as methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, and hymic anhydride; dodecenyl succinic anhydride and the like.
- Aliphatic acid anhydrides aromatic acid anhydrides such as phthalic anhydride and trimellitic anhydride; organic dihydrazides such as dicyandiamide and adipic acid dihydrazide; tris (dimethylaminomethyl) phenol; dimethylbenzylamine; 1,8-diazabicyclo ( 5,4,0) undecene and its derivatives; imidazoles such as 2-methylimidazole, 2-ethyl-4-methylimidazole, and 2-phenylimidazole; These curing agents can be used alone or in combination of two or more.
- the blending amount of the curing agent is appropriately set according to the type of the thermosetting resin and the curing agent to be used, but generally, the blending amount of the curing agent is It is 0.1 mass part or more and 200 mass parts or less.
- the coating layer 72 in the heat radiating member 1 may contain a coupling agent from the viewpoint of improving the adhesive force at the interface between the filler 73 of the thermal radiation ceramic material 10 and the hardened thermosetting resin.
- a coupling agent examples include ⁇ -glycidoxypropyltrimethoxysilane, N- ⁇ (aminoethyl) ⁇ -aminopropyltriethoxysilane, N-phenyl- ⁇ -aminopropyltrimethoxysilane, ⁇ -mercaptopropyltrimethoxysilane. Silane etc. are mentioned. These coupling agents can be used alone or in combination of two or more.
- the blending amount of the coupling agent is appropriately set according to the type of thermosetting resin and coupling agent used. Generally, the amount of the coupling agent compounded is 0.01 parts by mass or more and 1 part by mass or less with respect to 100 parts by mass of the thermosetting resin.
- the inorganic binder is preferably a liquid binder that has good compatibility with the filler 73 of the heat emitting ceramic material 10 and can be uniformly dispersed.
- many inorganic binders have a higher curing temperature than organic binders, but from the viewpoint of workability and prevention of deterioration due to heat treatment of the base material, the curing temperature of the inorganic binder is 250 ° C. or less. be.
- the curing temperature of the inorganic binder is preferably 200° C. or lower, more preferably 180° C. or lower.
- the inorganic binder is not particularly limited, but examples thereof include sol-gel glass, organic-inorganic hybrid glass, water glass, one-liquid inorganic adhesive, two-liquid inorganic adhesive, and the like. These can be used singly or in combination of two or more.
- the base material 71 of the heat radiating member 1 is not particularly limited, but is preferably metal or ceramic with high thermal conductivity from the viewpoint of efficiently transmitting the heat of the heating element.
- metals are Al, copper (Cu), stainless steel, iron (Fe), and other alloys.
- ceramics are Al 2 O 3 , magnesia (MgO), zirconia (ZrO 2 ), aluminum nitride (AlN) and silicon carbide (SiC). These can be used singly or in combination of two or more.
- the heat dissipation member 1 includes a base material 71 and a coating layer 72 containing fillers 73 of the thermal radiation ceramic material 10 having a high average emissivity in the wavelength range of 3 ⁇ m to 25 ⁇ m.
- the filler 73 contains wurtzite-type metal oxide particles 11 having a relatively high emissivity as a main component, and includes trivalent metal-doped metal oxide particles 12 and monovalent metal-doped metal oxide particles having different emission spectra. At least one of the particles 13 is contained. As a result, it is possible to obtain the heat dissipating member 1 having a higher average emissivity than the conventional one and excellent cooling performance.
- the raw materials are ZnO powder and Al 2 O 3 powder.
- the average particle size of the ZnO powder is 1 ⁇ m
- the average particle size of the Al 2 O 3 powder is 1 ⁇ m.
- the compounding ratio of each powder is 97.43 parts by mass of ZnO powder and 2.57 parts by mass of Al 2 O 3 powder.
- 1 part by mass of polyoxyethylene lauryl ether as a dispersant, 1 part by mass of polyvinyl alcohol as a binder, and 50 parts by mass of water are added to 100 parts by mass of raw material powder. Mix for about 5 hours in a ball mill to prepare a slurry.
- the resulting slurry is then spray-dried with a spray dryer to obtain granulated powder.
- the obtained granulated powder is filled into a radome-shaped mold and subjected to CIP molding using a cold isostatic press to obtain a compact.
- the applied pressure is 98 MPa.
- the obtained compact is subjected to heat treatment at 600°C for 2 hours in an air atmosphere for degreasing. After that, the degreased compact is fired at 1300° C. for 6 hours in a nitrogen atmosphere.
- the heat radiation member 1 made of the heat radiation ceramic material 10 is formed.
- the substitution amount of the trivalent metal in the heat radiation ceramic material 10 thus formed is 2 mol %.
- Example 2 The raw material is the same as Example 1 except that the amount of ZnO powder to be blended is 99.87 parts by mass and the amount of Al 2 O 3 powder to be blended is 0.13 parts by mass.
- the substitution amount of the trivalent metal in the heat radiation ceramic material 10 thus formed is 0.1 mol %.
- Example 3 The raw material is the same as Example 1, except that the amount of ZnO powder is 99.34 parts by mass and the amount of Al 2 O 3 powder is 0.66 parts by mass.
- the substitution amount of the trivalent metal in the heat emitting ceramic material 10 thus formed is 0.5 mol %.
- Example 4 The raw material is the same as Example 1 except that the amount of ZnO powder to be blended is 93.81 parts by mass and the amount of Al 2 O 3 powder to be blended is 6.19 parts by mass.
- the substitution amount of the trivalent metal in the heat radiation ceramic material 10 thus formed is 5 mol %.
- Example 5 The raw material is the same as Example 1 except that the amount of ZnO powder to be blended is 91.55 parts by mass and the amount of Al 2 O 3 powder to be blended is 8.45 parts by mass.
- the substitution amount of the trivalent metal in the heat emitting ceramic material 10 thus formed is 7 mol %.
- Example 6 In the raw material, the amount of ZnO powder was 98.59 parts by mass, no Al 2 O 3 powder was blended, and instead the amount of Li 2 CO 3 powder was 1.41 parts by mass. Same as Example 1. The substitution amount of the monovalent metal in the heat emitting ceramic material 10 thus formed is 3 mol %.
- Example 7 In the raw material, the amount of ZnO powder was 99.90 parts by mass, no Al 2 O 3 powder was blended, and instead the amount of Li 2 CO 3 powder was 0.10 parts by mass. Same as Example 1. The substitution amount of the monovalent metal in the heat radiation ceramic material 10 thus formed is 0.2 mol %.
- Example 8 In the raw material, the amount of ZnO powder was 95.44 parts by mass, no Al 2 O 3 powder was blended, and instead the amount of Li 2 CO 3 powder was 4.56 parts by mass. Same as Example 1. The substitution amount of the monovalent metal in the heat radiation ceramic material 10 thus formed is 10 mol %.
- Example 9 In the raw material, the amount of ZnO powder was 94.58 parts by mass, no Al 2 O 3 powder was blended, and instead the amount of Li 2 CO 3 powder was 5.42 parts by mass. Same as Example 1. The substitution amount of the monovalent metal in the heat radiation ceramic material 10 thus formed is 12 mol %.
- Example 10 In the raw materials, the blending amount of ZnO powder is 96.09 parts by mass, the blending amount of Al 2 O 3 powder is 2.53 parts by mass, and the blending amount of Li 2 CO 3 powder is 1.38 parts by mass. It is the same as Example 1 except that.
- the substitution amount of the trivalent metal in the thermal radiation ceramic material 10 thus formed is 2 mol %, and the substitution amount of the monovalent metal is 3 mol %.
- Example 1 The raw material is the same as Example 1 except that the amount of ZnO powder is 100 parts by mass and the amount of Al 2 O 3 powder is 0 parts by mass.
- Example 2 In the raw material, the same as Example 1 except that the amount of ZnO powder to be blended was 0 parts by mass and the amount of Al 2 O 3 powder to be blended was 100 parts by mass.
- the porosity of the heat radiation member 1 made of the heat radiation ceramic material 10 obtained in Examples 1 to 10 and Comparative Examples 1 and 2 is measured. Porosity is calculated using the method described above.
- Cooling Performance as Heat Dissipating Member 1 A ceramic heater is attached to one side surface of a thermal radiation ceramic material 10 having a length of 100 mm, a width of 100 mm and a thickness of 7 mm. A power of 20 W is applied to the mounted ceramic heater, and left for several hours until the temperature of the thermal radiation ceramic material 10 and the ceramic heater reaches the saturation temperature. After that, a thermocouple is used to measure the surface temperature of the ceramic heater. The saturation temperature of the ceramic heater when 20 W of power is applied is the cooling performance of the heat radiating member 1 . A lower saturation temperature indicates a higher cooling performance of the heat dissipating member 1 .
- the average emissivity is obtained by measuring each emissivity in the wavelength range of 3 ⁇ m or more and 25 ⁇ m or less using an emissivity measuring device and calculating the average value of the emissivity in the entire wavelength region. be done. At this time, the test piece used is one cut from the thermal radiation ceramic material 10 into a length of 20 mm, a width of 20 mm and a thickness of 2 mm.
- FIG. 12 is a diagram showing an example of raw materials of heat radiating members, heat radiating ceramic materials, and heat radiation properties in Examples 1 to 10 and Comparative Examples 1 and 2.
- FIG. In the item of raw materials, mass % of ZnO powder, Al 2 O 3 powder and Li 2 CO 3 powder constituting powder raw materials, and mass parts of dispersant, binder and water with respect to 100 mass parts of powder raw materials are shown.
- the item of the thermal radiation ceramic material 10 indicates the substitution amount [mol %] of trivalent metal, the substitution amount [mol %] of monovalent metal, and the porosity [%].
- the heat radiation performance item shows the results of the above two evaluation items.
- the two evaluation items are the average emissivity [%] of the heat radiation ceramic material 10 in the wavelength region of 3 ⁇ m or more and 25 ⁇ m or less and the cooling performance as the heat dissipation member 1, that is, the saturation temperature [° C.] when 20 W of power is applied. .
- the heat radiating members 1 of Examples 1 to 10 have an average emissivity of 70% or more. Also, the saturation temperature when 20 W of power is applied falls within the range of 116°C to 139°C.
- the heat radiating members 1 of Examples 1 to 10 are more excellent in cooling performance as the heat radiating member 1 as the average emissivity is higher.
- the average emissivity is 83%, which is the highest among Examples 1-10. In other words, it is shown that the cooling performance of the heat dissipating member 1 is improved as compared with the case where some Zn atoms of ZnO are replaced with a trivalent metal or a monovalent metal.
- the heat dissipating member 1 of Comparative Example 2 contains only Al 2 O 3 as a constituent material and does not contain ZnO as a main component. Therefore, the average emissivity is low, and the cooling performance as the heat radiating member 1 is also degraded.
- the wurtzite-type metal oxide 100 as a main component and containing at least one of the trivalent metal-doped metal oxide 110 and the monovalent metal-doped metal oxide 120, a high average emissivity is realized.
- the range of wavelengths to be covered is widened, and the amount of heat radiation is increased. That is, it is possible to obtain the heat dissipating member 1 having an average emissivity of 70% or more and excellent cooling performance.
- a heat sink having an average emissivity of 70% or more and excellent cooling performance can be obtained.
- 1 heat radiation member 10 thermal radiation ceramic material, 11 metal oxide particles, 12 trivalent metal-doped metal oxide particles, 13 monovalent metal-doped metal oxide particles, 21 first layer, 22 second layer, 50 electrical and electronic equipment , 51 circuit board, 52 metal bonding material, 53 semiconductor element, 71 base material, 72 coating layer, 73 filler, 74 binder, 100 wurtzite metal oxide, 101 metal atom, 102 oxygen atom, 110 trivalent metal dope Metal oxide, 111 trivalent metal atom, 120 monovalent metal-doped metal oxide, 121 monovalent metal atom.
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Abstract
Description
図1は、実施の形態1に係る放熱部材の一例を模式的に示す断面図である。放熱部材1は、金属酸化物粒子11と、三価金属ドープ金属酸化物粒子12と、一価金属ドープ金属酸化物粒子13と、を含有する熱放射セラミック材料10からなる。図1において、金属酸化物粒子11は、第1金属酸化物粒子に対応し、三価金属ドープ金属酸化物粒子12および一価金属ドープ金属酸化物粒子13は、第2金属酸化物粒子に対応する。
空隙率={1-[Wdry/(L×W×T)/ρtheory]}×100 ・・・(1)
図8は、実施の形態2に係る放熱部材の構成の一例を模式的に示す断面図である。以下では、実施の形態1と異なる部分を説明する。なお、実施の形態1と同一の構成要素には同一の符号を付して、その説明を省略する。
原料は、ZnO粉末、Al2O3粉末である。ZnO粉末の平均粒径は1μmであり、Al2O3粉末の平均粒径は1μmである。各粉末の配合比は、ZnO粉末を97.43質量部とし、Al2O3粉末を2.57質量部とする。また、100質量部の原料の粉末に対して、1質量部の分散剤であるポリオキシエチレンラウリルエーテルと、1質量部の結合剤であるポリビニルアルコールと、50質量部の水と、を加えてボールミルで約5時間混合し、スラリーを調製する。
原料において、ZnO粉末の配合量が99.87質量部とされ、Al2O3粉末の配合量が0.13質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の三価金属の置換量は0.1mol%となる。
原料において、ZnO粉末の配合量が99.34質量部とされ、Al2O3粉末の配合量が0.66質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の三価金属の置換量は0.5mol%となる。
原料において、ZnO粉末の配合量が93.81質量部とされ、Al2O3粉末の配合量が6.19質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の三価金属の置換量は5mol%となる。
原料において、ZnO粉末の配合量が91.55質量部とされ、Al2O3粉末の配合量が8.45質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の三価金属の置換量は7mol%となる。
原料において、ZnO粉末の配合量が98.59質量部とされ、Al2O3粉末が配合されず、代わりにLi2CO3粉末の配合量が1.41質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の一価金属の置換量は3mol%となる。
原料において、ZnO粉末の配合量が99.90質量部とされ、Al2O3粉末が配合されず、代わりにLi2CO3粉末の配合量が0.10質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の一価金属の置換量は0.2mol%となる。
原料において、ZnO粉末の配合量が95.44質量部とされ、Al2O3粉末が配合されず、代わりにLi2CO3粉末の配合量が4.56質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の一価金属の置換量は10mol%となる。
原料において、ZnO粉末の配合量が94.58質量部とされ、Al2O3粉末が配合されず、代わりにLi2CO3粉末の配合量が5.42質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の一価金属の置換量は12mol%となる。
原料において、ZnO粉末の配合量が96.09質量部とされ、Al2O3粉末の配合量が2.53質量部とされ、Li2CO3粉末の配合量が1.38質量部とされること以外は実施例1と同様である。このようにして形成される熱放射セラミック材料10の三価金属の置換量は2mol%となり、一価金属の置換量は3mol%となる。
原料において、ZnO粉末の配合量が100質量部とされ、Al2O3粉末の配合量が0質量部とされること以外は実施例1と同様である。
原料において、ZnO粉末の配合量が0質量部とされ、Al2O3粉末の配合量が100質量部とされること以外は実施例1と同様である。
縦100mm、横100mmおよび厚さ7mmの熱放射セラミック材料10の片側表面に、セラミックヒータを取り付ける。取り付けたセラミックヒータに20Wの電力を印加し、熱放射セラミック材料10およびセラミックヒータの温度が飽和温度に達するまで、数時間放置する。その後、熱電対を用いて、セラミックヒータの表面温度を計測する。20Wの電力を投入したときのセラミックヒータの飽和温度が放熱部材1としての冷却性能となる。飽和温度が低い方が、放熱部材1としての冷却性能が高いことを示す。
平均放射率は、放射率測定装置を用いて、3μm以上25μm以下の波長領域における各放射率を測定し、全波長領域での放射率の平均値を算出することによって求められる。このとき、試験片は、熱放射セラミック材料10から、縦20mm、横20mmおよび厚さ2mmに切り出されるものが使用される。
Claims (15)
- 熱放射セラミック材料を備える放熱部材であって、
前記熱放射セラミック材料は、ウルツ鉱型の結晶構造を有する金属酸化物である第1金属酸化物を主成分とし、3μm以上25μm以下の波長領域での平均放射率が70%以上となる金属酸化物である第2金属酸化物を含み、
前記第2金属酸化物は、前記第1金属酸化物の一部の金属原子を、三価の金属原子で置換した三価金属ドープ金属酸化物および一価の金属原子で置換した一価金属ドープ金属酸化物のうち少なくとも一方を含むことを特徴とする放熱部材。 - 前記第1金属酸化物は、ZnOであることを特徴とする請求項1に記載の放熱部材。
- 前記第2金属酸化物が前記三価金属ドープ金属酸化物を含む場合に、前記三価の金属原子は、AlまたはGaであることを特徴とする請求項1または2に記載の放熱部材。
- 前記第2金属酸化物が前記一価金属ドープ金属酸化物を含む場合に、前記一価の金属原子は、LiまたはNaであることを特徴とする請求項1または2に記載の放熱部材。
- 前記第2金属酸化物が前記三価金属ドープ金属酸化物および前記一価金属ドープ金属酸化物を含む場合に、
前記三価の金属原子は、AlまたはGaであり、
前記一価の金属原子は、LiまたはNaであることを特徴とする請求項1または2に記載の放熱部材。 - 前記熱放射セラミック材料は、前記第1金属酸化物の粒子からなる第1金属酸化物粒子と、前記第2金属酸化物の粒子からなる第2金属酸化物粒子と、を含む焼結体であることを特徴とする請求項1から5のいずれか1つに記載の放熱部材。
- 前記熱放射セラミック材料は、前記第1金属酸化物の粒子からなる第1金属酸化物粒子と、前記三価金属ドープ金属酸化物の粒子からなる三価金属ドープ金属酸化物粒子と、を含む焼結体であることを特徴とする請求項3に記載の放熱部材。
- 前記熱放射セラミック材料は、前記第1金属酸化物の粒子からなる第1金属酸化物粒子と、前記一価金属ドープ金属酸化物の粒子からなる一価金属ドープ金属酸化物粒子と、を含む焼結体であることを特徴とする請求項4に記載の放熱部材。
- 前記熱放射セラミック材料は、前記第1金属酸化物の粒子からなる第1金属酸化物粒子と、前記三価金属ドープ金属酸化物の粒子からなる三価金属ドープ金属酸化物粒子と、前記一価金属ドープ金属酸化物の粒子からなる一価金属ドープ金属酸化物粒子と、を含む焼結体であることを特徴とする請求項5に記載の放熱部材。
- 前記熱放射セラミック材料は、前記焼結体の表面の少なくとも一部に、前記一価金属ドープ金属酸化物粒子が配置されていることを特徴とする請求項8または9に記載の放熱部材。
- 前記熱放射セラミック材料は、前記三価金属ドープ金属酸化物粒子を含む前記第1金属酸化物粒子からなる第1層と、前記一価金属ドープ金属酸化物粒子を含む前記第1金属酸化物粒子からなる第2層と、が積層されていることを特徴とする請求項9に記載の放熱部材。
- 基材と、
前記基材の表面にコーティングされるコーティング層と、
をさらに備え、
前記熱放射セラミック材料は、前記コーティング層に含まれることを特徴とする請求項1から11のいずれか1つに記載の放熱部材。 - 前記コーティング層は、前記熱放射セラミック材料からなるフィラーと、バインダと、を有することを特徴とする請求項12に記載の放熱部材。
- 請求項1から13のいずれか1つに記載の放熱部材を備えることを特徴とするヒートシンク。
- 前記放熱部材の表面に高低差が25μm以上である凹凸を有することを特徴とする請求項14に記載のヒートシンク。
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WO2006008863A1 (ja) * | 2004-07-15 | 2006-01-26 | Fujifilm Corporation | 無機分散型エレクトロルミネッセンス素子 |
US20100051815A1 (en) * | 2008-08-29 | 2010-03-04 | Kwangyeol Lee | Heat-radiating pattern |
JP2010080215A (ja) * | 2008-09-25 | 2010-04-08 | Sumitomo Chemical Co Ltd | 有機エレクトロルミネッセンス素子およびその製造方法 |
JP2017197592A (ja) * | 2016-04-25 | 2017-11-02 | 株式会社日立製作所 | 放熱材及びモータ |
JP2019151881A (ja) * | 2018-03-02 | 2019-09-12 | 株式会社豊田中央研究所 | 電子機器用放熱部材とその製造方法および電子機器 |
JP2020082522A (ja) * | 2018-11-26 | 2020-06-04 | トヨタ自動車株式会社 | 熱放射構造体 |
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WO2006008863A1 (ja) * | 2004-07-15 | 2006-01-26 | Fujifilm Corporation | 無機分散型エレクトロルミネッセンス素子 |
US20100051815A1 (en) * | 2008-08-29 | 2010-03-04 | Kwangyeol Lee | Heat-radiating pattern |
JP2010080215A (ja) * | 2008-09-25 | 2010-04-08 | Sumitomo Chemical Co Ltd | 有機エレクトロルミネッセンス素子およびその製造方法 |
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