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Method for preparing large-size complex silicon nitride ceramic

A silicon nitride ceramic, complex shape technology, applied in ceramic molding machines, manufacturing tools, additive processing, etc., can solve the problem that direct writing technology cannot prepare large-sized silicon nitride ceramic materials, etc., to save raw materials, The effect of reducing production cycle and improving product quality

Active Publication Date: 2019-05-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention solves the problem that the existing direct writing molding technology cannot prepare large-sized silicon nitride ceramic materials, and provides a method for preparing large-sized and complex-shaped silicon nitride ceramics

Method used

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  • Method for preparing large-size complex silicon nitride ceramic
  • Method for preparing large-size complex silicon nitride ceramic
  • Method for preparing large-size complex silicon nitride ceramic

Examples

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specific Embodiment approach 1

[0027] Specific implementation mode 1: In this implementation mode, a method for preparing silicon nitride ceramics with large size and complex shape is carried out according to the following steps:

[0028] 1. Weighing:

[0029] Weigh 30-55 parts of silicon nitride powder, 0.2-5 parts of ammonium polyacrylate, 0.2-5 parts of polyethylene glycol, 3-10 parts of nano-alumina, 3-10 parts Nano yttrium oxide and 45-70 parts of deionized water;

[0030] 2. Mixing:

[0031] Mix 30 to 55 parts of silicon nitride powder, 3 to 10 parts of nano-alumina and 3 to 10 parts of nano-yttrium oxide to obtain the primary mixed raw material, and use absolute ethanol as the ball milling medium for the initial mixing The raw materials are ball-milled for 12h-48h, dried and sieved to obtain the ball-milled raw materials. The ball-milled raw materials are mixed with 45-70 parts of deionized water, 0.2-5 parts of ammonium polyacrylate and 0.2-5 parts of polyethylene glycol Alcohol mixed, and using ...

specific Embodiment approach 2

[0037] Embodiment 2: This embodiment differs from Embodiment 1 in that: the particle size of the silicon nitride powder described in step 1 is 0.5 μm˜20 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0038] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the particle size of the silicon nitride powder in Step 1 is 0.5 μm˜5 μm. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for preparing a large-size complex silicon nitride ceramic and relates to the method for preparing silicon nitride ceramics. The invention aims to solve the problem that the present direct writing molding technique cannot prepare large-size silicon nitride ceramic materials. The preparation method comprises the following steps: 1) weighting; 2) mixing; 3) 3D printing; 4) sintering, thereby finishing the preparation of the large-size complex silicon nitride ceramic. The method provided by the invention can be used for preparing the large-size complex silicon nitride ceramic.

Description

technical field [0001] The present invention relates to a method for preparing silicon nitride ceramics. Background technique [0002] The preparation of ceramics usually needs to go through four main steps: powder treatment, green body forming, solid sintering and final processing and manufacturing. Among them, the forming technology of ceramic materials has great influence on the geometric structure of materials, shortening the preparation cycle, reducing costs and realizing mass production of products. played a vital role. [0003] The ceramic molding process is the process of transforming a dispersion system such as powder, slurry or plastic material into a green body with a certain strength and geometric size. Among them, dry pressing (Dry Pressing), isostatic pressing (Isostatic Pressing) and various plastic moldings are all traditional ceramic molding methods, which are simple in operation and low in precision. In recent years, various new ceramic molding technologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/626B28B1/00B33Y10/00B33Y70/00
Inventor 杨治华杨亦天贾德昌
Owner HARBIN INST OF TECH
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