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

Silicon carbide coating modified multi-wall carbon nanotube reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof

A technology of multi-wall carbon nanotubes and ceramic composite materials, applied in the field of high-temperature structural ceramic materials, can solve the problems of thermal shock resistance to be further improved, poor toughness, etc., and achieve the improvement of crack formation and propagation ability and interface bonding ability , Improve the effect of strength and fracture toughness

Active Publication Date: 2020-02-14
HARBIN INST OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of poor toughness and thermal shock resistance of existing silicon boron carbon nitrogen ceramic composite materials, etc. The present invention provides a silicon carbide coating modified multi-wall carbon nanotube reinforced silicon boron carbon nitrogen ceramics The preparation method of composite material, it comprises the following steps:

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
  • Silicon carbide coating modified multi-wall carbon nanotube reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof
  • Silicon carbide coating modified multi-wall carbon nanotube reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof
  • Silicon carbide coating modified multi-wall carbon nanotube reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing a silicon carbide coating modified multi-walled carbon nanotube reinforced silicon-boron-carbon-nitride ceramic composite material, which includes the following steps:

[0033] Step 1: Add silicon powder, graphite powder and hexagonal boron nitride powder into a high-energy ball mill, and conduct ball milling under the protection of argon. The disk rotating speed is 325r / min, and the relative rotating speed of ball mill jar is 650r / min, obtains amorphous silicon boron carbon nitrogen powder, and the molar ratio of silicon, carbon, boron in the amorphous silicon boron carbon nitrogen powder is 2:3:1, wherein , the particle size of the silicon powder, the graphite and the hexagonal boron nitride is not greater than 20 μm, and the purity of the silicon powder, the graphite and the hexagonal boron nitride is 99-99.9 %;

[0034] Step 2: Coat the multi-walled carbon nanotubes with polysilylazane, and after drying, use a tubular...

Embodiment 2

[0052] The difference between this example and Example 1 is that the sintering conditions in the fourth step are sintering for 5 minutes at a temperature of 2000° C. and a pressure of 40 MPa under the protection of nitrogen.

[0053] The silicon carbide coating modified multi-walled carbon nanotubes reinforced silicon boron carbon nitride ceramic composite material obtained in this example has a flexural strength of 380.0-615.0MPa, a hardness of 3.5-4.8GPa, and a fracture toughness of 5.23-7.16MPa m 1 / 2 .

Embodiment 3

[0055] The difference between this example and Example 1 is that the sintering conditions in the fourth step are sintering for 10 minutes under the protection of nitrogen at a temperature of 1900° C. and a pressure of 40 MPa.

[0056] The silicon carbide coating modified multi-walled carbon nanotubes reinforced silicon boron carbon nitride ceramic composite material obtained in this example has a flexural strength of 480.0-620.0MPa, a hardness of 3.8-5.5GPa, and a fracture toughness of 5.10-7.10MPa m 1 / 2 .

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
strengthaaaaaaaaaa
flexural strengthaaaaaaaaaa
flexural strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a silicon carbide coating modified multi-walled carbon nanotube reinforced silicon-boron-carbon-nitrogen ceramic composite material and a preparation method thereof. The methodcomprises the steps: adding a silicon powder, a graphite powder and a hexagonal boron nitride powder into a high-energy ball mill according to the molar ratio of 2:3:1, carrying out ball milling underargon protection, and thus obtaining an amorphous silicon-boron-carbon-nitrogen powder; coating multi-walled carbon nanotubes with polysilazane, then drying under argon protection, and carrying out high temperature treatment; carrying out planetary ball milling of the amorphous silicon-boron-carbon-nitrogen powder and the silicon carbide coated modified multi-walled carbon nanotubes to obtain anuniformly dispersed mixed powder; and carrying out spark plasma sintering of the mixed powder, to obtain the silicon carbide coating modified multi-walled carbon nanotube reinforced silicon-boron-carbon-nitrogen ceramic composite material, wherein the material is composed of 95-99 parts by volume of the amorphous silicon-boron-carbon-nitrogen powder and 1-5 parts by volume of the silicon carbide coating modified multi-walled carbon nanotubes. Compared with the prior art, the prepared material has good oxidation resistant ability and quite high strength and fracture toughness. .

Description

technical field [0001] The invention relates to the technical field of high-temperature structural ceramic materials, in particular to a silicon carbide coating-modified multi-wall carbon nanotube reinforced silicon-boron-carbon-nitrogen ceramic composite material and a preparation method thereof. Background technique [0002] Silicon-based non-oxides such as silicon carbide, silicon nitride and silicon carbon nitrogen and other high-temperature structural ceramic materials have attracted extensive attention due to their good high-temperature stability and mechanical properties. In recent years, a quaternary silicon-boron-carbon-nitride ceramic sometimes even reaches 2000°C due to its excellent thermal stability in a non-oxidizing environment (it remains amorphous at 1800°C). A large number of studies have shown that the high temperature oxidation resistance of silicon boron carbon nitrogen ceramics is better than that of traditional structural ceramics. The traditional pre...

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): C04B35/80C04B35/515C04B35/52C04B35/583C04B35/628C04B35/83
CPCC04B35/515C04B35/522C04B35/583C04B35/62863C04B35/83C04B2235/5288C04B2235/96
Inventor 贾德昌廖宁杨治华周玉段小明王胜金何培刚蔡德龙
Owner HARBIN INST OF TECH