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Method to prepare compact silicon carbide ceramic by 3D forming

A technology of silicon carbide ceramics and silicon carbide powder, which is applied in the field of 3D printing to achieve the effect of ensuring the molding accuracy

Active Publication Date: 2018-08-17
MAINTOP TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, direct three-dimensional printing technology can ensure the molding of complex shapes. Huang Xiaoting et al. reported that a ceramic slurry with a certain solid content was prepared with camphene, silicon carbide, binder, and dispersant, and a ceramic green body was prepared by using 3D technology (see "Study on Preparation and Performance of 3D Printed Silicon Carbide Ceramics", Huang Xiaoting et al., Special Ceramics Branch of China Ceramic Society, Abstract Collection of the 19th National High-tech Ceramics Academic Annual Conference, 2016: 1), however, this technology realizes silicon carbide Powder molding must add enough organic matter, and these organic matter must leave more pores after pyrolysis at high temperature, so it is impossible to directly obtain high-density silicon carbide ceramics, or additional complex post-processing procedures are required to obtain high-density silicon carbide ceramics

Method used

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  • Method to prepare compact silicon carbide ceramic by 3D forming
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  • Method to prepare compact silicon carbide ceramic by 3D forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] A cylindrical straight-toothed silicon carbide ceramic gear is prepared, the number of teeth z=12, the modulus m=6, the thickness h=5mm, and the pitch circle diameter d=72mm. Its detailed preparation steps are as follows:

[0103] 1) Prepare silicon carbide raw material powder

[0104] There are three types of abrasive grade green silicon carbide on the market, according to "GB / T 2480-2008 Ordinary Abrasive Silicon Carbide" and "GB / T2481.2-2009 Detection and Marking of Abrasive Grain Size Composition for Bonded Abrasives Part 2: Micropowder" It is stipulated that the particle size numbers from coarse to fine are: #320, #700 and #3000, and the chemical composition of the three green silicon carbide powders purchased meets the requirements of the national standard indicators. The chemical composition index of the purchased silicon carbide powder has reached the purity required by the present invention, and the minimum density of the three powders tested is 3.182g cm -3 ...

Embodiment 2

[0122] The target product is: a silicon carbide ceramic turbine with a diameter of 45.0mm, a thickness of 10.0mm, and 13 helical blades. Its specific implementation steps are consistent with embodiment 1 except that some parameters are different. The parameters different from embodiment 1 in each step are as follows:

[0123] 1) Prepare silicon carbide raw material powder

[0124] The selected primary raw materials are three kinds of green silicon carbide abrasive products whose particle size numbers are #1200, #3000 and #6000 respectively, and their chemical composition and density are the same as those in Example 1. The sphericity, median diameter D 50 , D representing the width of the particle size distribution 95 、D 5 All have reached the requirements of the present invention for raw material powder, and their specific numerical parameters are shown in Table 2-1.

[0125] 2) Preparation of coating powder

[0126] The raw material ratio of the coating solution is show...

Embodiment 3

[0142] The target product is a M22×60mm silicon carbide ceramic bolt. Its specific implementation steps are consistent with Example 1 except that some parameters are different. Its parameters different from embodiment 1 are as follows:

[0143] 1) Prepare silicon carbide raw material powder

[0144]The selected primary raw materials are three kinds of green silicon carbide abrasive commercial products whose particle diameter numbers are #360, #800 and #3000 respectively, and their chemical composition and density are the same as those in Example 1. The sphericity, median diameter D 50 , D representing the width of the particle size distribution 95 、D 5 All have reached the requirements of the present invention for raw material powder, and its specific parameters are shown in Table 3-1.

[0145] 2) Preparation of coating powder

[0146] The proportioning ratio of each raw material in the coating solution is shown in Table 3-2. The silica used to prepare the coating soluti...

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Abstract

The invention provides a method to prepare compact silicon carbide ceramic by 3D forming and belongs to the technical field of 3D printing. The method comprises the steps of coating silico carbide powders of three particle sizes evenly with polycarbosilane and silicon dioxide mixture so as to obtain coated powders in large, medium and small particle sizes; mixing the coated powders according to thick, medium and thin particle sizes according to the mass ratio of 100:(2.7-12.5):(0.2-1.6) proportionally to obtain printing powder; green ceramic is formed directly with the printing powder via a direct three-dimensional printing forming machine; ink for the three-dimensional printing former is polycarbosilane tetrahydrofuran having mass concentration of 0.5% to 1.3%; the green ceramic that is sintered at high temperature to obtain compact silicon carbide ceramic. The silicon carbide ceramic product has high compactness and high purity, as well as relative density of > / =98.0% and silicon carbide content of > / =99.0%.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a method for preparing dense silicon carbide ceramics by 3D molding. Background technique [0002] Silicon carbide (SiC) ceramics have the advantages of acid and alkali resistance, high hardness, high wear resistance, high temperature strength, small high temperature creep, high thermal conductivity, and thermal shock resistance. They are widely used in petroleum, chemical, mechanical, aerospace, electronics, nuclear industries, etc. field has a wide range of uses. In particular, the application of dense silicon carbide ceramics in high temperature and high corrosion environments has an irreplaceable position for other materials. [0003] 3D molding is a technology based on the incremental accumulation of discrete materials to manufacture entities. It has the advantages of rapidity, precision, and the ability to form complex shapes. It is considered to be expected to promote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/64C04B35/628C04B35/622B33Y10/00B33Y70/00
CPCB33Y10/00B33Y70/00C04B35/571C04B35/622C04B35/62807C04B35/62834C04B35/62886C04B35/64C04B2235/5436C04B2235/5472C04B2235/6567C04B2235/6581
Inventor 曹宏郭剑慧陈童杨氢
Owner MAINTOP TECH DEV CO LTD
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