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Preparation method and application of modified silicon nitride and powder containing modified silicon nitride

A technology for silicon nitride powder and silicon nitride, which is applied in the field of organic molecular surface graft modification of silicon nitride powder, can solve the problem of difficult to prepare silicon nitride slurry, difficult to disperse and difficult to nitride silicon nitride powder. Silicon powder application requirements and other issues

Active Publication Date: 2021-10-08
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the disadvantage that silicon nitride powder is difficult to disperse in water, although the current research has made great progress, it is still difficult to prepare a silicon nitride slurry with a solid phase content higher than 55% suitable for direct solidification injection molding. It is still difficult to make different types of silicon nitride powders meet the requirements of practical applications

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  • Preparation method and application of modified silicon nitride and powder containing modified silicon nitride
  • Preparation method and application of modified silicon nitride and powder containing modified silicon nitride
  • Preparation method and application of modified silicon nitride and powder containing modified silicon nitride

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Effect test

Embodiment 1

[0035] Commercially available silicon nitride powder, the α-phase content is greater than 90%, the volume moment average diameter of the particles is 0.7 μm, the purity is greater than 99%, the shape of the particles is irregular, and the initial solid content of the water-based slurry is 36vol% (1Pa .s). The powder modification process is as follows: (1) The silicon nitride powder is made into a 30vol% suspension with 2M hydrochloric acid, and transferred to a ball mill tank. Within the range of ball milling or mechanical stirring for 8 hours, centrifuge after ball milling to remove the supernatant. (2) Wash the treated silicon nitride powder with deionized water, centrifuge to accelerate powder precipitation, remove the supernatant, and repeat the above steps until the conductivity value of the supernatant is close to that of deionized water. (3) After the silicon nitride powder is dried, it is suspended in anhydrous dichloromethane to form a 30vol% suspension, and then 0.1...

Embodiment 2

[0037]Commercially available silicon nitride powder, the α-phase content is greater than 90%, the volume moment average diameter of the particles is 0.7 μm, the purity is greater than 99%, the shape of the particles is irregular, and the initial solid content of the water-based slurry is 36vol% (1Pa .s). The powder modification process is as follows: (1) The silicon nitride powder is made into a 30vol% suspension with 2M hydrochloric acid, and transferred to a ball mill tank. Within the range of ball milling or mechanical stirring for 8 hours, centrifuge after ball milling to remove the supernatant. (2) Wash the treated silicon nitride powder with deionized water, centrifuge to accelerate powder precipitation, remove the supernatant, and repeat the above steps until the conductivity value of the supernatant is close to that of deionized water. (3) After the silicon nitride powder is dried, it is suspended in anhydrous dichloromethane to form a 30vol% suspension, and then 0.05...

Embodiment 3

[0039] Commercially available silicon nitride powder, the α-phase content is greater than 90%, the volume moment average diameter of the particles is 0.7 μm, the purity is greater than 99%, the shape of the particles is irregular, and the initial solid content of the water-based slurry is 36vol% (1Pa .s). The powder modification process is as follows: (1) The silicon nitride powder is made into a 30vol% suspension with 2M hydrochloric acid, and transferred to a ball mill tank. Within the range of ball milling or mechanical stirring for 8 hours, centrifuge after ball milling to remove the supernatant. (2) Wash the treated silicon nitride powder with deionized water, centrifuge to accelerate powder precipitation, remove the supernatant, and repeat the above steps until the conductivity value of the supernatant is close to that of deionized water. (3) After the silicon nitride powder is dried, it is suspended in anhydrous dichloromethane to form a 25vol% suspension, and then 0.2...

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Abstract

The invention discloses a preparation method and application of modified silicon nitride and powder containing modified silicon nitride. The surface grafting modification of the surface of the silicon nitride powder is carried out by sequentially reacting the hydroxyl group on the surface of the silicon nitride powder with the halogenated silane and the organic molecule containing the hydroxyl group, so as to obtain the silicon nitride powder body grafting modified on the surface of the organic molecule. Its purpose is to improve the dispersibility and rheological properties of silicon nitride powder water-based slurry for direct solidification injection molding process. Compared with the water-based slurry of silicon nitride powder before modification (solid phase content 30-37vol%, 1 Pa.s), the solid content of the modified silicon nitride powder water-based slurry obtained in the present invention can reach 57-37vol%. 62vol% (1 Pa.s).

Description

technical field [0001] The invention relates to a method for grafting and modifying silicon nitride powder with organic molecules and its application, in particular to a method for grafting and modifying silicon nitride powder with halosilane and hydroxyl-containing organic molecules and its uses. Background technique [0002] The preparation of high-performance fine ceramics requires high-quality powders and mature molding processes to ensure. Ceramic colloidal molding technology can form various ceramic parts with complex shapes near net size. It is an important ceramic molding method. The key to this technology is to prepare low-viscosity, high-solid-content ceramic suspensions, such as gel injection Molding (GC) requires the minimum solid phase content of the ceramic slurry to be 50% (volume fraction, the same below), and direct solidification injection molding (DCC) generally requires the solid phase content of the slurry to be greater than 55%, and requires the slurry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/626
CPCC04B35/584C04B35/62605C04B2235/5436
Inventor 李家柱殷军港
Owner YANTAI UNIV