Unlock instant, AI-driven research and patent intelligence for your innovation.

Nitride ceramic-microcrystalline glass composite material and preparation method thereof

A technology of nitride ceramics and glass-ceramics, applied in the field of inorganic composite materials, can solve the problems of low output, long cycle, poor repeatability, etc., achieve simple and efficient process, easy components, improved thermal shock resistance and ablation resistance Effect

Active Publication Date: 2016-05-04
TIANJIN CHENGJIAN UNIV
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes all have technical problems such as long preparation period, poor repeatability, low yield, and difficult quality control, which limit the practical application of the material.

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
  • Nitride ceramic-microcrystalline glass composite material and preparation method thereof
  • Nitride ceramic-microcrystalline glass composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a nitride ceramic-glass-ceramics composite material, comprising the steps of:

[0025] 1) Weigh 68% of raw material silicon nitride and 32% of boron oxide powder according to mass percentage, wherein boron oxide is obtained by dehydration and transformation of boric acid, and the quality of boron oxide is converted according to 56.3% of the mass of boric acid; the weighed silicon nitride Put boric acid and boric acid into the agate tank, add agate balls according to the ball-to-material ratio of 2:1; then add grinding aid acetone or n-hexane; mix on a planetary ball mill for 4 hours to obtain a slurry;

[0026] 2) drying the slurry at 80-90°C for 2-4 hours, removing the ball milling aid, grinding, and passing through a 100-mesh standard sieve to obtain a solid powder;

[0027] 3) Put the solid powder obtained in step 2) into a graphite mold coated with boron nitride on the inner wall. After the mold is loaded, put it into a hot-press furnace, keep...

Embodiment 2

[0030] The difference with the preparation method of nitride ceramics-glass-ceramics composite material in embodiment 1 is:

[0031] The raw material is composed of 57wt.% silicon nitride and 43wt.% boron oxide powder; boron oxide is obtained by dehydration and conversion of boric acid, and the mass of boron oxide is obtained by converting 56.3% of the mass of boric acid.

[0032] Other processes are the same as in Example 1.

[0033] figure 1 a is the phase diagram of the product obtained in this embodiment; it can be seen that its structure is composed of fine-crystalline boron nitride and glass-ceramics.

Embodiment 3

[0035] The difference with the preparation method of nitride ceramics-glass-ceramics composite material in embodiment 1 is:

[0036] The raw material is composed of 50wt.% silicon nitride and 50wt.% boron oxide powder; boron oxide is obtained by dehydration and conversion of boric acid, and the mass of boron oxide is obtained by converting 56.3% of the mass of boric acid.

[0037] Other processes are the same as in Example 1.

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

No PUM Login to View More

Abstract

The invention discloses a nitride ceramic-microcrystalline glass composite material and a preparation method thereof. The nitride ceramic-microcrystalline glass composite material is prepared by mixing 20-90 wt.% of silicon nitride, 10-70 wt.% of boron oxide and 0-70 wt.% of silica and then sintering, wherein the boron oxide is obtained by dehydration transformation of boric acid. The preparation method comprises the steps: firstly, weighing the raw materials, and carrying out wet mixed milling to be uniform, to obtain a slurry; then drying the slurry to obtain a solid powder, then loading a mold with the solid powder, under a protection condition of vacuum or inert gas, carrying out heat preservation for 1-3 h at the temperature of 200-700 DEG C, and then heating up at a rate of 5-20 DEG C / min; when the temperature rises to 1550-1850 DEG C, pressurizing, maintaining the pressure at 5-20 MPa, and carrying out hot pressing for 1-3 h; and cooling, and demolding to obtain the nitride ceramic-microcrystalline glass composite material. The method is short in production period and high in yield, and the prepared product has uniform performance.

Description

technical field [0001] The invention relates to the field of inorganic composite materials, in particular to a nitride ceramic-glass-ceramic composite material and a preparation method thereof. Background technique [0002] Nitride ceramic-glass-ceramic composite material is a new type of material developed on the basis of quartz glass material and boron nitride ceramic material. This material combines the advantages of quartz glass and boron nitride, and has a composite structure of the two in the microstructure. While maintaining the dielectric properties of the two, it also has excellent heat resistance, wave transparency, and ablation resistance. And mechanical properties, can be used to manufacture heat-resistant parts and communication windows of hypersonic aircraft. However, although some existing processes can synthesize such composite materials with excellent performance, the process is cumbersome and the cost is high. Zhang Junbao of Harbin Institute of Technolog...

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 Applications(China)
IPC IPC(8): C04B35/584C04B35/5833C04B35/622
CPCC04B35/583C04B35/584C04B35/622C04B2235/3409C04B2235/3418C04B2235/656
Inventor 石飞飞吴赟高富吴培栋夏晓禄刘辉王志峰王卫东科宝郭贝贝潘光美诸兆雪
Owner TIANJIN CHENGJIAN UNIV