Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A nanowire self-reinforced porous silicon nitride ceramic and its preparation method

A technology of silicon nitride ceramics and nanowires, which is applied to ceramic products, other household appliances, household appliances, etc., and can solve the problems of non-uniform pores in porous silicon nitride ceramics, reduced utilization of silicon powder, and uneven distribution of pores. , to achieve the effects of increasing nitrogen concentration, promoting contact, and high utilization of raw materials

Active Publication Date: 2019-05-24
WUHAN UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Porous silicon nitride ceramics obtained by these methods have non-uniform pore size and non-uniform pore distribution, and in the reaction process, silicon nitride is mainly generated by the direct contact between nitrogen and silicon powder, so that the silicon inside the porous silicon nitride ceramics Powder cannot fully contact with nitrogen, which not only reduces the utilization rate of silicon powder, but also the remaining silicon powder will form structural defects with silicon nitride, which will affect the performance of the product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A nanowire self-reinforced porous silicon nitride ceramic and its preparation method
  • A nanowire self-reinforced porous silicon nitride ceramic and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0029] Step 1. Using 70-76wt% silicon powder, 5-10wt% catalyst and 14-20wt% nitrogen source as raw materials, add 20-26wt% deionized water of the raw materials, and stir for 30-60min to obtain a ceramic slurry material.

[0030] Step 2. Add foam made of 10-16wt% of the raw material foaming agent to the ceramic slurry under stirring conditions. After adding the foam, continue stirring for 30-60 minutes to obtain a ceramic foam slurry; The mass ratio of foaming agent and deionized water in the foam is 1: (10-13).

[0031] Step 3: Pour the ceramic foam slurry into a mould, and let it stand at room temperature and in a nitrogen environment for 1-24 hours; then dry it at 60-110°C for 12-24 hours, and demould to obtain a ceramic body.

[0032] Step 4: Place the ceramic body in a vacuum tube furnace, and in a nit...

Embodiment 2

[0038] A nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. The present embodiment is the same as embodiment 1 except blowing agent.

[0039] The blowing agent described in this embodiment is a mixture of alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.

[0040] The nanowire self-reinforced porous silicon nitride ceramic prepared in this example is tested: the flexural strength is 20-26 MPa; the compressive strength is 50-60 MPa.

Embodiment 3

[0042] A nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. The present embodiment is except blowing agent, all the other are the same as embodiment 1.

[0043] The foaming agent described in this embodiment is a mixture of fatty alcohol polyoxyethylene ether, sodium hydroxymethylcellulose and hydroxyethylcellulose.

[0044] The nanowire self-reinforced porous silicon nitride ceramic prepared in this example is tested: the flexural strength is 20-26 MPa; the compressive strength is 50-60 MPa.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
flexural strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: using 70-80 wt% of silicon powder, 5-10 wt% of catalyst and 10-20 wt% of nitrogen source as raw materials, adding deionized water which accounts for 20-30 wt% of the raw materials, and stirring to obtain a ceramic slurry; adding foam prepared by adding a foaming agent (accounting for 10-20 wt% of the raw materials) into the ceramic slurry, and continuously stirring for 30-60 minutes to obtain a ceramic foam slurry; pouring the ceramic foam slurry into a mold, standing in a nitrogen environment, drying, and demolding to obtain a ceramic body; in a nitrogen atmosphere, heating the ceramic body to 1100-1150 DEG C, and keeping the temperature; heating to 1200-1600 DEG C, and keeping the temperature; and naturally cooling to obtain the nanowire self-reinforced porous silicon nitride ceramic. The method has the advantages of simple technique, low cost, high utilization ratio of raw materials and controllable process. The prepared product has the advantages of uniform pore size, uniform pore size distribution and high mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of porous silicon nitride ceramics. It specifically relates to a nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. Background technique [0002] Porous silicon nitride ceramics is an advanced refractory material that combines the performance characteristics of silicon nitride ceramics with the structural characteristics of porous materials. It is widely used in aerospace, chemical industry, metallurgy and other fields. At present, the preparation methods of porous silicon nitride ceramics mainly include adding pore-forming agents, freeze-drying, sol-gel methods, and carbothermal reduction methods. [0003] Porous silicon nitride ceramics obtained by these methods have non-uniform pore size and non-uniform pore distribution, and in the reaction process, silicon nitride is mainly generated by the direct contact between nitrogen and silicon powder, so that the silicon in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/10C04B35/584C04B35/622C04B35/634C04B35/626C04B35/65C04B35/636C04B35/80
CPCC04B35/591C04B35/622C04B35/6264C04B35/63488C04B35/6365C04B35/65C04B35/806C04B38/106C04B2235/3852C04B2235/405C04B2235/428C04B2235/6586C04B2235/96
Inventor 丁军吴郑敏邓承继余超祝洪喜柴志南
Owner WUHAN UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products