AlN ceramic powder preparation method based on 3D printing molding
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A technology of 3D printing and ceramic powder is applied in the field of preparation of AlN ceramic powder based on 3D printing to achieve the effects of preventing foreign pollution, increasing the furnace capacity and facilitating handling.
Pending Publication Date: 2021-02-23
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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[0004] The purpose of the present invention is to provide a method for preparing AlN ceramic powder based on 3D printing to solve many problems encountered in the high-temperature gas-solid reaction required for the macro-preparation of the above-mentioned AlN ceramic powder
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Embodiment 1
[0029] The AlN powder is prepared by using a ceramic powder preparation method based on 3D printing, which specifically includes the following steps:
[0030] (1) Weighing nanoscale α-A12O3 powder 76.8g, high-purity carbon black powder 23.2g, polyvinyl alcohol 5g, tetramethylammonium hydroxide 0.5g, ammonia water 0.5g, composite solvent 138g (by water, ethanol, acetone Mixed liquids composed of triols (40%, 30%, 30% by weight) and alumina balls were put into a polyurethane ball mill tank, and ball milled on a rod mill at a speed of 300r / min for 24h to obtain a solid phase Raw ink with a content of about 42%;
[0031] (2) Inject the above raw material ink into the barrel of the 3D printer for printing and molding. The diameter of the printing nozzle is 3mm, the printing pressure is 150kPa, and the printing speed is 10mm / s. After printing, put the raw material body into a drum with a temperature of 100°C Dried in an air oven for 24 hours to obtain a raw material body with an in...
Embodiment 2
[0035] The AlN powder is prepared by using a ceramic powder preparation method based on 3D printing, which specifically includes the following steps:
[0036] (1) Weighing 76.9g of nanoscale γ-A12O3 powder, 23.1g of high-purity carbon black powder, 6g of carboxymethyl cellulose, 0.6g of urea, 0.6g of ammonia water, 155g of composite solvent (mixed by water, tert-butanol Liquid, the proportion by weight is respectively 75%, 25%) and alumina grinding balls, put into a plastic container and stir, and then homogenize for 1min on a homogenizer with a rotating speed of 2000r / min to obtain a raw material with a solid phase content of about 39% ink;
[0037](2) Inject the above raw material ink into the barrel of the 3D printer for printing and molding. The diameter of the printing nozzle is 2mm, the printing pressure is 200kPa, and the printing speed is 15mm / s. Dry in a freeze dryer for 24 hours to obtain a raw material body with an internal regular three-dimensional through-hole st...
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Abstract
The invention discloses an AlN ceramic powder preparation method based on 3D printing molding. The method comprises the following steps: (1) mixing raw material powder, a solvent and an additive to prepare raw material ink with high solid content; (2) printing the raw material ink into a raw material blank with a regular three-dimensional through hole structure by adopting a 3D printing molding process, and drying the raw material blank; (3) putting the raw material blank into a reaction device with airflow control and anti-pollution functions in a high-temperature graphite sintering furnace,and carrying out high-temperature synthesis in a controlled reaction environment; and (4) finally, carrying out ball-milling process treatment to obtain the high-purity AlN ceramic powder. According to the method, the raw material powder can be printed into the blank with the regular three-dimensional through hole structure, the gas-solid synthesis reaction can be fully carried out during high-temperature synthesis, and the high-purity AlN ceramic powder can be obtained by combining the ceramic powder synthesis reaction device with airflow control and anti-pollution functions.
Description
technical field [0001] The invention belongs to the field of powder preparation, and in particular relates to a method for preparing AlN ceramic powder based on 3D printing. Background technique [0002] Aluminum nitride (AlN) ceramics have high thermal conductivity, excellent electrical insulation properties, and a thermal expansion coefficient close to that of silicon. They are heat dissipation materials and packaging materials for large-scale integrated circuits, semiconductor module circuits, and high-power devices. In addition, AlN also has the characteristics of non-wetting with most non-ferrous metals, and can be used as advanced refractory materials, thermocouple protection tubes, etc. The wide application of high-performance AlN ceramics depends on the macro-supply of high-purity, low-cost AlN powder. At present, domestic high-purity AlN powder mainly relies on imports, and the price is very expensive, which greatly restricts the application range of AlN ceramic ma...
Claims
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