Scaly particles containing aluminum nitride

Abstract

An object of the present invention is to provide flaky particles containing aluminum nitride that are easily dispersed in an organic resin and can be more suitably used for various industrial applications. 【Means for solving the problem】 The flaky particles containing aluminum nitride according to the present invention have through-holes. Therefore, when preparing a composite by mixing the organic resin and the flaky particles, the organic resin can pass through the through-holes and pass through the flaky particles. Therefore, the flaky particles are easily dispersed in the organic resin, and by uniformly containing the flaky particles in the organic resin, it is easy to prepare a composite with enhanced thermal conductivity efficiently.

Description

[Technical field]

[0001] The present invention relates to scaly particles containing aluminum nitride and having through holes. [Background technology]

[0002] Aluminum nitride is known to have high thermal conductivity. Therefore, attempts have been made to use scaly particles containing aluminum nitride (hereinafter sometimes referred to as AlN scaly particles) for various industrial applications, either as heat dissipation materials as they are or as composites with organic resins. As an example, attempts have been made to prepare thermally conductive and heat dissipating materials such as thermal grease and thermally conductive sheets for electronic components using composites containing AlN scaly particles in organic resins. Also, attempts have been made to prepare plastic materials such as substrates and housing materials that serve as electrical insulation parts using composites containing AlN scaly particles in organic resins.

[0003] As such AlN scaly particles, for example, JP 2020-1981 A (Patent Document 1) discloses an aluminum nitride composition having an average crystallite size of less than 390 Å, The composition may be in the form of scale-like particles; It is also disclosed that by incorporating the composition in an organic resin, a composite having excellent thermal conductivity can be produced.

[0004] Patent Document 1 discloses that, in order to realize an aluminum nitride composition having an average crystallite size of less than 390 Å, an aluminum nitride precursor prepared by hydrolyzing aluminum alkoxide and subjecting it to condensation polymerization is fired at 1,300° C. or lower in a nitride gas or inert gas atmosphere.

[0005] In addition, JP 2012-122057 A (Patent Document 2) discloses a highly insulating and highly thermally conductive filler, · Aluminum nitride can be adopted as the inorganic compound that can constitute the filler. · The shape of the filler may be flaky particles. is disclosed. And it is disclosed that an inorganic-organic composite composition with improved thermal conductivity can be manufactured by incorporating the filler into a matrix made of a thermoplastic resin.

[0006] Note that none of Patent Documents 1 to 2 are inventions that examined the more detailed shape of the flaky particles. Therefore, the more detailed shape of the flaky particles is not disclosed or suggested.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, there has been a demand for providing AlN flaky particles that are more easily dispersed in an organic resin and can be more suitably used for various industrial applications than the AlN flaky particles disclosed in the prior art such as Patent Documents 1 to 2.

Means for Solving the Problems

[0009] The present invention is "(Claim 1) Used for preparing a heat-conducting and heat-radiating material by incorporating it into an organic resin, with a plurality of Through-hole existing over the entire main surface , flaky particles containing aluminum nitride and the mass percentage of aluminum nitride in the mass of the metal compound constituting the scaly particles is 100% by mass, the crystallite size of the aluminum nitride contained in the scaly particles is 331 - 494 Å, Scaly particles . (Claim 2) Containing the flaky particles according to Claim 1 in an organic resin. Heat-conducting and heat-radiating material . ".

Advantages of the Invention

[0010] During continuous research, the applicant of the present application realized AlN flaky particles having through-holes and obtained the following findings. (Finding) When AlN flaky particles have through-holes, when preparing a composite by mixing an organic resin and the AlN flaky particles, the organic resin can pass through the AlN flaky particles through the through-holes. Therefore, the AlN flaky particles are easy to disperse in the organic resin, and it is easy to prepare a composite with enhanced thermal conductivity by uniformly containing the AlN flaky particles in the organic resin.

[0011] On the other hand, when AlN flaky particles do not have through-holes, when preparing a composite by mixing an organic resin and the AlN flaky particles, the organic resin cannot pass through the AlN flaky particles. Therefore, the AlN flaky particles are difficult to disperse in the organic resin, and it is difficult to prepare a composite with enhanced thermal conductivity by uniformly containing the AlN flaky particles in the organic resin.

[0012] From the above, the AlN flaky particles having through-holes according to the present invention can realize a composite with efficiently enhanced thermal conductivity. Therefore, it can be more suitably used for various industrial applications.

[0013] And a composite containing the AlN flaky particles having through-holes according to the present invention in an organic resin is rich in thermal conductivity.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Best Mode for Carrying Out the Invention

[0015] In the present invention, various configurations can be appropriately selected, such as the following configurations. Unless otherwise specified, all various measurements described in the present invention are carried out under atmospheric pressure and at a temperature of 25°C. Also, all various measurement results described in the present invention are obtained by measuring up to a value one digit smaller than the required value, and the required value is calculated by rounding the said value. As a specific example, when the required value is up to the first decimal place, the value up to the second decimal place is obtained by measurement, and the value of the first decimal place is calculated by rounding the obtained value of the second decimal place, and this value is taken as the required value. And each upper limit value and each lower limit value exemplified in the present invention can be arbitrarily combined.

[0016] The AlN flaky particles according to the present invention contain aluminum nitride which is a metal compound. The mass percentage of aluminum nitride in the mass of the metal compound constituting the AlN flaky particles (hereinafter sometimes referred to as the AlN mass percentage) can be appropriately adjusted. Note that the AlN flaky particles may contain metal compounds such as aluminum oxide in addition to aluminum nitride. However, as the AlN flaky particles rich in thermal conductivity, the AlN mass percentage is preferably 60% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, even more preferably 90% by mass or more, and most preferably 100% by mass. Here, the AlN mass percentage means a value (unit: mass%) quantified using the reference intensity ratio (RIR) from the result measured by supplying the measurement object (such as AlN flaky particles) to an X-ray diffractometer (desktop X-ray diffractometer MiniFlex600, manufactured by Rigaku Corporation) (measurement conditions: 2θ measurement range +3 to 140°, tube voltage: 30 kV, tube current: 15 mA).

[0017] In addition to metal compounds, the AlN flaky particles may contain a carbon component or an organic compound. Alternatively, the AlN flaky particles may not contain a carbon component or an organic compound and may be composed only of a metal compound. The AlN flaky particles that do not contain a carbon component or an organic compound can be prepared by burning off all of the activated carbon and organic compounds remaining in the fired body in (Step 4) of the method for producing AlN flaky particles described below.

[0018] The crystallite size of aluminum nitride contained in the AlN flaky particles can be adjusted as appropriate. However, since the aluminum nitride rich in rigidity due to the large crystallite size can be suitably used for various industrial applications, it is preferably 160 Å or more, more preferably 200 Å or more, and most preferably 300 Å or more. The upper limit value can also be adjusted as appropriate. However, since the aluminum nitride having flexibility to such an extent that it is rich in handleability can be suitably used for various industrial applications, it is preferably 700 Å, more preferably 500 Å. The crystallite size of aluminum nitride contained in the AlN flaky particles here means the crystallite size obtained from the half-value width using the Scherrer method based on the measurement results obtained under the measurement conditions in the X-ray diffractometer described above. That is, the half-value width of the plane with the strongest diffraction intensity and the highest uniformity in aluminum nitride is substituted into the following Scherrer's formula to obtain the crystallite size (unit: Å). Note that LaB6 is used as the standard substance. Scherrer's formula: D = K × λ / (β × cosθ) D: Crystallite size (Å) K: Scherrer constant (K = 0.94) λ: Measured X-ray wavelength (Å) β: Spread of diffraction line due to crystallite size (rad) θ: Bragg angle of diffraction line

[0019] The flaky particles referred to in the present invention refer to flaky particles having an average aspect ratio of 3 or more obtained by the method described below, which are fish scale-like (in many cases, particles having a substantially hexagonal bottom surface and a thin hexagonal column shape with a small thickness).

[0020] The average aspect ratio of the AlN flaky particles is appropriately adjusted so that they can be suitably used for various industrial applications. It is preferably 5 or more, more preferably 10 or more, and even more preferably 20 or more. The upper limit can be adjusted as appropriate, but 50 is preferred in consideration of the dispersibility in the organic resin.

[0021] The average aspect ratio can be determined by the following method. Here, a cylinder surrounding the particles for which the average aspect ratio is to be determined will be described using Fig. 1, which is a schematic view seen from the upper diagonal side.

[0022] (Method for determining the average aspect ratio) Take an electron micrograph of the particles to be measured. The magnification of the electron microscope is adjusted so that the subsequent steps can be easily performed. Then, select one particle that appears alone from the taken electron micrograph. Next, re-take electron micrographs of the selected particle from various directions. Then, using each of the taken electron micrographs, create a cylinder (C) having a circle with the smallest area surrounding the widest surface (main surface) of the particle as its bottom surface (B). Determine the diameter (D, represented by a dashed line in Fig. 1) of the bottom surface (B) of the cylinder (C) drawn in this way, and calculate the value A1 obtained by dividing it by the thickness (T, the unit is the same as the diameter of the aforementioned bottom surface). Similarly, for another 99 particles to be measured, determine the diameter (D) of the bottom surface (B) of the drawn cylinder (C), and calculate the values A2 to A100 obtained by dividing it by the thickness (T) respectively. After that, arrange the calculated values A1 to A100 in descending order of value, and take the average value in the 20th to 79th positions with the largest values as the average aspect ratio (unitless).

[0023] The average particle diameter of the AlN flaky particles is appropriately adjusted so that they are easily dispersed in the organic resin and can be suitably used for various industrial applications. Preferably, it is 1 μm or more, more preferably 3 μm or more, and even more preferably 5 μm or more. The upper limit value can also be appropriately adjusted, but preferably it is 30 μm, more preferably 20 μm, and even more preferably 10 μm. The average particle diameter can be determined by the following method.

[0024] (Method for determining the average particle diameter) Arrange 100 diameters (D) of the bottom surface (B) obtained in the above-mentioned (method for determining the average aspect ratio) in descending order, and take the average value of the diameters (D) in the 20th to 79th positions with the largest values as the average particle diameter.

[0025] The average thickness of the AlN flaky particles is appropriately adjusted. Preferably, it is 0.1 μm or more, more preferably 0.2 μm or more, and even more preferably 0.3 μm or more. The upper limit value can be appropriately adjusted, but considering the dispersibility in the organic resin, 1 μm is preferable. The average thickness can be determined by the following method.

[0026] (Method for determining the average thickness) Arrange 100 thicknesses (T) obtained in the above-mentioned (method for determining the average aspect ratio) in descending order of thickness, and take the average value of the thicknesses (T) in the 20th to 79th positions with the largest values as the average thickness.

[0027] The AlN flaky particles according to the present invention have through-holes. Whether the AlN flaky particles have through-holes can be confirmed by the following method.

[0028] (Method for confirming whether there are through-holes) Randomly select 40 cylinders (C) from the 100 cylinders (C) prepared by the above-mentioned (method for determining the average aspect ratio). Then, observe the particles surrounded by the cylinder (C) on one bottom surface (B) of each of the selected 40 cylinders (C). And confirm whether each particle has an opening and whether a space or another particle on the opposite side of the particle can be seen through the opening. In all 40 particles confirmed as described above, if the above-described space or other particles were visible, the particle being measured had through-holes. On the other hand, in all 40 particles confirmed as described above, if the above-described space or other particles were not visible, the particle being measured did not have through-holes.

[0029] When AlN flaky particles have through-holes, when preparing a composite by mixing an organic resin and the AlN flaky particles, the organic resin can pass through the through-holes and pass through the AlN flaky particles. Therefore, the AlN flaky particles are easily dispersed in the organic resin, and by uniformly containing the AlN flaky particles in the organic resin, it is easy to prepare a composite with enhanced thermal conductivity efficiently.

[0030] In particular, in the case of AlN flaky particles having a plurality of through-holes over the entire main surface of the AlN flaky particles, it is possible to more easily mix the organic resin and the AlN flaky particles when preparing the composite, and by uniformly containing the AlN flaky particles in the organic resin, it is more preferable to easily prepare a composite with enhanced thermal conductivity efficiently.

[0031] In addition, in order to be able to easily mix the organic resin and the AlN flaky particles when preparing the composite, the surface of the AlN flaky particles having through-holes may be modified with a surface treatment agent such as a silane coupling agent.

[0032] The AlN flaky particles having through-holes according to the present invention can be produced, for example, (Step 1) A step of preparing boehmite and a carbon material, and mixing them to prepare a mixture, (Step 2) A step of preparing a fired body by heating the mixture at a temperature higher than 1300 °C in a nitride gas atmosphere, (Step 3) A step of cooling the fired body, and can be produced by a manufacturing method including the above steps.

[0033] (Process 1) will be described. The type of carbon material can be appropriately selected, and activated carbon, carbon black, carbon nanotubes, etc. can be adopted. In particular, it is preferable to adopt activated carbon because of its large specific surface area and high reactivity. Further, the mass ratio of boehmite to the carbon material in the mixture can be appropriately adjusted, but the mass ratio of boehmite: carbon material can be 1:9 to 9:1, can be 2:8 to 8:2, can be 3:7 to 7:3, and can be 4:6 to 6:4.

[0034] (Process 2) will be described. The nitride gas used when heating the mixture refers to a gas containing a molecule having a nitrogen atom and an atom bonded thereto in the molecule. For example, nitrogen gas, ammonia gas, etc. can be adopted. In particular, it is preferable to heat the mixture in a nitrogen gas atmosphere so that AlN flaky particles having through-holes with a higher AlN mass percentage can be prepared.

[0035] The applicant has found in the study that by setting the temperature for heating the mixture in this manufacturing method to a temperature higher than 1300 °C, AlN flaky particles having through-holes can be prepared. The temperature is preferably 1400 °C or higher, more preferably 1500 °C or higher, and even more preferably 1600 °C or higher. The upper limit of the temperature can be appropriately adjusted, but 2000 °C is realistic. The heating time can be appropriately adjusted, but it is preferably 1 hour or more, more preferably 3 hours or more, and most preferably 5 hours or more. The upper limit of the time can be appropriately adjusted, but 10 hours is realistic. The mixture can be heated using, for example, an oven or a firing furnace.

[0036] (Process 3) will be described. The method for cooling the fired body can be appropriately selected, and a method of allowing it to cool to room temperature can be adopted. In particular, it is preferable to cool the fired body in a nitride gas atmosphere so as to prevent the intended AlN flaky particles having through-holes from not being obtained due to an excessive reaction during cooling.

[0037] Also, after (Process 3) described above, (Step 4) By heating the fired body in an atmosphere of a gas containing oxygen, carbon materials and organic compounds contained in the fired body are burned off, and then the fired body is cooled. It is preferably provided with this step. By providing this step, as a result, carbon materials and organic compounds remaining in the fired body can be burned off, and thus AlN flaky particles having through-holes with a low content of carbon materials and organic compounds can be prepared. In particular, by burning off all of the activated carbon and organic compounds remaining in the fired body, AlN flaky particles composed only of metal compounds can be prepared.

[0038] As the gas containing oxygen used at this time, for example, air, oxygen gas, etc. can be adopted. The heating temperature may be a temperature at which carbon materials and organic compounds can be burned off, preferably 500°C or higher, more preferably 650°C or higher, and most preferably 800°C or higher. The heating time can be adjusted as appropriate, but is preferably 1 hour or longer, more preferably 2 hours or longer. The upper limit of the time can be adjusted as appropriate, but 10 hours is realistic. The fired body can be heated using, for example, an oven or a firing furnace.

[0039] Thereafter, the method for cooling the fired body can be appropriately selected, and a method such as allowing it to cool to room temperature in an air atmosphere can be adopted.

[0040] An organic resin and the AlN flaky particles having through-holes according to the present invention can be mixed to prepare a composite containing the AlN flaky particles in the organic resin. The composite according to the present invention is rich in thermal conductivity.

[0041] The type of the organic resin is not particularly limited because it varies depending on the application. For example, when the composite is used for semiconductor device applications or thermal printer applications, epoxy resins, polyimide resins, fluorine resins, acrylic resins, polyester resins, silicone resins, polyester resins, etc. can be mentioned. Also, when used for adhesive applications, styrene-based elastomer resins, polyamide-based resins, polyester-based resins, polyurethane-based resins, polyolefin-based resins, etc. can be mentioned. Furthermore, when used for solar cell applications, ethylene-vinyl acetate copolymer (EVA), polyimide-based resins, polyester-based resins, etc. can be adopted.

[0042] The mass percentage of the AlN flaky particles having through-holes in the composite of the present invention is not particularly limited because it varies depending on the application and can be adjusted as appropriate. The mass percentage is preferably 1% by mass or more, preferably 5% by mass or more, and more preferably 10% by mass or more. The mass percentage (P) of the AlN flaky particles having through-holes in the composite is a value calculated by the following formula. P = (F / H) × 100 In the formula, F means the mass (unit: g) of the AlN flaky particles having through-holes, and H means the mass (unit: g) of the composite.

[0043] Note that the composite may be composed only of an organic resin and AlN flaky particles having through-holes, but may also contain other constituent components. As other constituent components, for example, AlN flaky particles having no through-holes, aluminum nitride having different shapes (for example, spherical particles, fibers or rod-shaped particles), or other particles having thermal conductivity may be included.

[0044] The composite preferably has excellent thermal conductivity with a thermal conductivity of 3 W / m·K or more. More preferably, it is 3.5 W / m·K or more, still more preferably 4 W / m·K or more, still more preferably 4.5 W / m·K or more, and still more preferably 5 W / m·K or more. The thermal conductivity of the composite can be measured using a steady-state thermal conductivity measuring device. The thermal conductivity can be obtained by subjecting a test piece taken from the composite to be measured to a steady-state thermal conductivity measuring device (SS-H40, manufactured by Vetter Co., Ltd.) and converting the thermal resistance value measured by the steady-state method.

[0045] Note that the shape of the composite according to the present invention is not particularly limited. For example, in addition to the sheet shape, it can be a rectangular parallelepiped, a cylinder, a prism, a pyramid, etc.

[0046] Such a method for manufacturing the composite can be appropriately selected. For example, an AlN flake particle dispersion is prepared by mixing AlN flake particles having through holes with a solution or dispersion of an organic resin. Then, the prepared AlN flake particle dispersion is molded. Thereafter, the composite can be manufactured by removing the solvent contained in the dispersion. Alternatively, the composite can be manufactured by mixing AlN flake particles having through holes with a melted organic resin, molding, and then cooling. Or, after coating the AlN flake particle dispersion on a support, the solvent and dispersion medium contained in the dispersion are removed, and the composite can be manufactured by peeling it from the support.

Examples

[0047] Hereinafter, the present invention will be specifically described by way of examples, but these do not limit the scope of the present invention.

[0048] (Comparative Example 1) Boehmite (average particle size: 10 μm) without through holes and activated carbon (specific surface area: 1400 m 2 / g, average particle size: 10 μm) were mixed in an equal mass ratio to prepare a mixture. The prepared mixture was fired at 1300 °C for 5 hours under a nitrogen atmosphere to prepare a fired body. Then, the fired body was cooled to room temperature by allowing it to cool in a nitrogen atmosphere. Thereafter, the cooled fired body was fired at 800 °C for 2 hours under an air atmosphere to burn off all the activated carbon and organic compounds remaining in the fired body. Thereafter, it was cooled to room temperature by allowing it to cool in an air atmosphere to obtain flaky particles of aluminum nitride (average aspect ratio: 40, average particle diameter: 10 μm, average thickness: 0.25 μm). As can also be seen from FIG. 3, which is an electron micrograph of the prepared flaky particles of aluminum nitride taken at a magnification of 5000 times, the prepared flaky particles of aluminum nitride did not have through-holes.

[0049] (Examples 1 to 3) Flaky particles of aluminum nitride (all with an average aspect ratio: 40, average particle diameter of the particles: 10 μm, average thickness: 0.25 μm) were obtained in the same manner as in Comparative Example 1, except that the firing temperature under a nitrogen atmosphere was changed (Example 1: 1400 °C, Example 2: 1500 °C, Example 3: 1600 °C). As can also be seen from FIG. 2, which is an electron micrograph of the prepared flaky particles of aluminum nitride taken at a magnification of 10000 times, each of the prepared flaky particles of aluminum nitride had a plurality of through-holes over the entire main surface.

[0050] (Example 4) Flaky particles of aluminum nitride (average aspect ratio: 3, average particle diameter of the particles: 3 μm, average thickness: 1 μm) were obtained in the same manner as in Example 1, except that boehmite having no other through-holes (average particle diameter of the particles: 3 μm) was used. The prepared flaky particles of aluminum nitride had a plurality of through-holes over the entire main surface.

[0051] (Example 5) Scaly particles of aluminum nitride (average aspect ratio: 20, average particle diameter of particles: 5 μm, average thickness: 0.25 μm) were obtained in the same manner as in Example 2, except that boehmite having no further through holes (average particle diameter of particles: 5 μm) was used. The prepared scaly particles of aluminum nitride had a plurality of through holes over the entire main surface thereof.

[0052] Also, in Reference Examples 1 to 6 listed below, aluminum nitride fibers were prepared in the same manner as the production method disclosed in the examples of Patent Document 1. Note that the “average fiber diameter” refers to the arithmetic mean value of the fiber diameters at 50 points of the fibers to be measured, and the “fiber diameter” refers to the diameter of the fiber measured based on an electron micrograph at 50 to 5000 times magnification of the cross section of the fiber.

[0053] (Reference Example 1) Ethylacetoacetate aluminum diisopropylate, yttrium nitrate, water, and 2-propanol were mixed at a molar ratio of 1:0.03:1.5:20 at a solution temperature of 0° C. and stirred for 24 hours to hydrolyze ethylacetoacetate aluminum diisopropylate. Thereafter, the thus-prepared mixed solution was heated and stirred at 70° C. for 24 hours for polycondensation. Then, after concentrating with an evaporator until the concentration of aluminum nitride produced after firing became 20 wt% of the mixed solution, the viscosity was increased until it became 2000 to 3000 mPa·s to obtain a drawable sol solution. Thereafter, using the drawable sol solution, continuous fibers of an aluminum nitride precursor were prepared by spinning and accumulating under the following electrospinning conditions. <Electrospinning conditions> Electrode: Metal nozzle Collector: Earthed drum Discharge amount from nozzle: 1.0 g / hour Distance between nozzle tip and drum collector: 10 cm Temperature and humidity in spinning container: 25° C. / 30% RH Finally, the aluminum nitride precursor continuous fibers were fired at 1150 °C for 5 hours in an ammonia gas atmosphere to obtain aluminum nitride fibers (average fiber diameter: 0.6 μm).

[0054] (Reference Examples 2 to 3) Aluminum nitride fibers (average fiber diameter: 0.6 μm) were obtained in the same manner as in Reference Example 1, except that the firing temperature in the ammonia gas atmosphere was changed (Reference Example 2: 1300 °C, Reference Example 3: 1500 °C).

[0055] (Reference Example 4) Ethyl acetoacetate aluminum diisopropylate, water, and 2-propanol were mixed at a molar ratio of 1:1.5:20 at a solution temperature of 0 °C and stirred for 24 hours to hydrolyze ethyl acetoacetate aluminum diisopropylate. Aluminum nitride fibers (average fiber diameter: 0.6 μm) were obtained in the same manner as in Reference Example 1, except that the thus-prepared mixed solution was used.

[0056] (Reference Examples 5 to 6) Aluminum nitride fibers (average fiber diameter: 0.6 μm) were obtained in the same manner as in Reference Example 4, except that the firing temperature in the ammonia gas atmosphere was changed (Reference Example 5: 1300 °C, Reference Example 6: 1500 °C).

[0057] Note that none of the aluminum nitride fibers prepared in Reference Examples 1 to 6 had through-holes.

[0058] (Reference Example 7) Commercially available aluminum nitride fibers (manufactured by U-MaP Co., Ltd., average fiber diameter: 5 μm) were prepared.

[0059] (Reference Example 8) Commercially available aluminum nitride spherical particles (HF-01, manufactured by Tokuyama Corporation, average aspect ratio: 1, average particle diameter: 2 μm) were prepared.

[0060] In addition, neither the aluminum nitride fibers nor the spherical aluminum nitride particles prepared in Reference Examples 7 to 8 had through-holes.

[0061] The various configurations of the above aluminum nitride particles were summarized in Table 1. For items that were not grasped, a "-" mark was described in the table.

[0062]

Table 1

[0063] The AlN flaky particles prepared in the examples had through-holes. Therefore, the AlN flaky particles can realize a composite with efficiently enhanced thermal conductivity.

[0064] And by containing the AlN flaky particles having through-holes according to the present invention in the organic resin, a composite rich in thermal conductivity can be realized.

Industrial Applicability

[0065] The AlN flaky particles having through-holes according to the present invention can be used in various industrial applications as a heat dissipation material as it is or as a composite with an organic resin. For example, it can be used in semiconductor device applications, thermal printer applications, adhesive applications, solar cell applications, etc. Also, as an example, the composite can be used as a thermal conduction heat dissipation material such as heat dissipation grease or a thermal conduction sheet used for electronic components, and as a plastic material such as a substrate or a housing material that bears an electrical insulation part.

Explanation of Symbols

[0066] C... Cylinder surrounding the particle B... Bottom surface of the cylinder T... Thickness of the cylinder D... Diameter of the bottom surface

Claims

1. Scaly particles containing aluminum nitride, having a plurality of through-holes over the entire main surface, and used for preparing a heat-conductive heat-dissipating material by being incorporated into an organic resin, wherein the mass percentage of aluminum nitride in the mass of the metal compound constituting the scaly particles is 100% by mass, and the crystallite size of the aluminum nitride contained in the scaly particles is 331 to 494 Å. Scaly particles.

2. A heat-conductive heat-dissipating material containing the scaly particles according to Claim 1 in an organic resin.

Images