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A 3D forming method for preparing silicon carbide ceramics with controllable pore size

A technology of silicon carbide ceramics and silicon carbide powder, applied in the field of 3D printing, can solve the problem of uncontrollable pore size, achieve the effect of narrow pore size distribution and ensure molding accuracy

Active Publication Date: 2020-03-17
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, these organic matter must leave more pores after pyrolysis at high temperature, and the pore size formed is uncontrollable

Method used

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  • A 3D forming method for preparing silicon carbide ceramics with controllable pore size
  • A 3D forming method for preparing silicon carbide ceramics with controllable pore size
  • A 3D forming method for preparing silicon carbide ceramics with controllable pore size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] The target product is a honeycomb silicon carbide porous ceramic tube. The macroscopic dimensions of the ceramic tube are as follows: the outer diameter is 25.4mm (1 inch), with 19 honeycomb holes, and the diameter of the honeycomb holes is 4.5mm; the filter hole diameter is expected to be 5.5μm. Its detailed preparation steps are as follows:

[0115] 1) Prepare silicon carbide raw material powder

[0116] The specific method of the first step is to use commercially available abrasive grade green silicon carbide as the primary raw material. According to the provisions of "GB / T 2480-2008 Ordinary Abrasive Silicon Carbide" and "GB / T 2481.2-2009 Detection and Marking of Abrasive Grain Size Composition for Bonded Abrasive Tools Part 2: Micropowder", the particle size numbers of purchased silicon carbide are respectively For: #1200 (coarse powder) and #6000 (fine powder). The chemical composition index of the purchased silicon carbide powder has reached the purity required...

Embodiment 2

[0134] The target product is a honeycomb silicon carbide porous ceramic tube, the macroscopic shape and size of which are the same as in Example 1, and the filter pore size is expected to be 16.0 μm. Its specific implementation steps are also consistent with Example 1 except that some parameters are different. Its main parameter that is different from embodiment 1 is as follows:

[0135] 1) Prepare raw material powder

[0136] The particle size numbers of two kinds of green silicon carbide abrasives selected as primary raw materials are respectively #360 and #3000, and their chemical composition and density are the same as 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 the raw material powder, and the specific values ​​are listed in Table 2-1. Table 2-1 also lists the D 50细 / D 50粗 Value, this ratio has also reached the requirement of th...

Embodiment 3

[0152] Example 3 is also to prepare a honeycomb silicon carbide porous ceramic tube, the macroscopic shape and size of which are the same as those of Example 1, and the filter pore size is expected to be 24.0 μm. Its specific implementation steps are also consistent with Example 1 except that some parameters are different. Its main parameter that is different from embodiment 1 is as follows:

[0153] 1) Prepare raw material powder

[0154] The particle size numbers of the two kinds of green silicon carbide abrasives selected as primary raw materials are respectively #700 and #3000, and their chemical composition and density are the same as 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 the specific values ​​are listed in Table 3-1. Table 3-1 also lists D 50细 / D 50粗 Value, this ratio has also reached the requirem...

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Abstract

The invention provides a method for preparing pore-size-controllable silicon carbide ceramic by means of three dimensional (3D) molding, belonging to the technical field of 3D printing. The method comprises the following steps: separately and uniformly coating two types of silicon carbide powder, having different particle sizes, with a mixture of polycarbosilane and silicon dioxide powder to obtain coarse, median and fine coated composite powder with three particle sizes, and mixing the obtained coarse, median and fine coated composite powder with three particle sizes according to a mass ratioof 100 to (0.2-1.6) to obtain printing powder; molding the printing powder by using a direct three-dimensional printing molding machine to obtain a ceramic green body, wherein ink used for the three-dimensional printing molding machine is a tetrahydrofuran solution of polycarbosilane having a mass concentration of 0.5-1.3%; sintering the ceramic green body obtained in the step (4) at a high temperature to obtain the pore-size-controllable silicon carbide ceramic. The method provided by the invention realizes the control of the pore size of the silicon carbide ceramic product by adjusting thecoarse powder median particle diameter D50.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a method for preparing silicon carbide ceramics with controllable pore diameter 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. As a filter medium, its pore size must be pore size, and the pore size distribution is required to be narrow, preferably a single pore size. [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 Patents(China)
IPC IPC(8): C04B35/565C04B35/64C04B35/628C04B35/622B33Y10/00B33Y70/10C04B38/06
CPCB33Y10/00B33Y70/00C04B35/571C04B35/622C04B35/62807C04B35/62834C04B35/62886C04B35/64C04B38/067C04B2235/5436C04B2235/5472C04B2235/6567C04B2235/6581C04B38/0009C04B38/007
Inventor 曹宏郭剑慧陈童杨氢
Owner MAINTOP TECH DEV CO LTD
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