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

Preparation method of ultra-long silicon carbide nano-wires

A silicon carbide nanowire and ultra-long technology, applied in the direction of nanotechnology, can solve the problems of increasing the difficulty of the preparation process, threatening the health of the staff, and the complexity of the preparation process, so as to improve the operation safety, low equipment requirements, Avoid the effects of purification operations

Inactive Publication Date: 2012-11-14
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain ultra-long silicon carbide nanowires with a length of up to 1 cm, but the preparation process is complicated, and the precursor used will undergo a strong exothermic hydrolysis reaction when heated or meets water, and release toxic and corrosive fumes, which are harmful to the human body. strong irritant
These all seriously threaten the health of the staff, and increase the operational difficulty of the preparation process

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
  • Preparation method of ultra-long silicon carbide nano-wires
  • Preparation method of ultra-long silicon carbide nano-wires
  • Preparation method of ultra-long silicon carbide nano-wires

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing ultra-long silicon carbide nanowires, comprising the following steps:

[0027] In the first step, dry tungsten trioxide powder and graphite powder are mixed in a mortar for 5 minutes according to the molar ratio of 1:4 to form a mixed powder with uniform color;

[0028] In the second step, the mixed powder prepared in the first step is loaded into the first ceramic boat with a size of 30mm×60mm×15mm, and the surface of the powder is kept smooth;

[0029] In the third step, dry silicon powder and silicon dioxide powder are mixed in a ball mill for 2 hours according to a molar ratio of 1:1 to form a mixed powder with uniform color;

[0030] The fourth step is to put the mixed powder prepared in the third step into the second ceramic boat with a size of 30mm×60mm×15mm, the height of which is 1 / 3 of the height of the inner wall of the second ceramic boat, and keep the powder surface flat , and cover a graphite paper on the second ceramic boat;

[00...

Embodiment 2

[0035] A method for preparing ultra-long silicon carbide nanowires, comprising the following steps:

[0036] In the first step, dry tungsten trioxide powder and graphite powder are mixed in a mortar for 10 minutes according to a molar ratio of 1:4.5 to form a mixed powder with uniform color;

[0037] In the second step, the mixed powder prepared in the first step is loaded into the first ceramic boat with a size of 30mm×60mm×15mm, and the surface of the powder is kept smooth;

[0038] In the third step, dry silicon powder and silicon dioxide powder are mixed in a ball mill for 4 hours according to a molar ratio of 1:1.2 to form a mixed powder with uniform color;

[0039] The fourth step is to put the mixed powder prepared in the third step into the second ceramic boat with a size of 30mm×60mm×15mm, the height of which is 1 / 4 of the height of the inner wall of the second ceramic boat, and keep the powder surface flat , and cover a silicon chip on the second ceramic boat;

[0...

Embodiment 3

[0044] A method for preparing ultra-long silicon carbide nanowires, comprising the following steps:

[0045]In the first step, dry tungsten trioxide powder and graphite powder are mixed in a mortar for 15 minutes according to the molar ratio of 1:5 to form a mixed powder with uniform color;

[0046] In the second step, the mixed powder prepared in the first step is loaded into the first ceramic boat with a size of 30mm×60mm×15mm, and the surface of the powder is kept smooth;

[0047] In the third step, dry silicon powder and silicon dioxide powder are mixed in a ball mill for 4 hours according to a molar ratio of 1:1.5 to form a mixed powder with uniform color;

[0048] The fourth step is to put the mixed powder prepared in the third step into the second ceramic boat with a size of 30mm×60mm×15mm, the height of which is 1 / 4 of the height of the inner wall of the second ceramic boat, and keep the powder surface flat , and cover the aluminum oxide sheet on the second ceramic bo...

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
heightaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of ultra-long silicon carbide nano-wires. The method comprises steps that: a mixed powder of tungstic oxide and graphite is placed in a first ceramic boat; a mixed powder of silicon and silicon dioxide is placed in a second ceramic boat, a substrate is covered on the second ceramic boat, and the second ceramic boat is positioned at a central part of a high-temperature furnace; the first ceramic boat is positioned at an upstream of flowing inert gas in the horizontal high-temperature furnace; the high-temperature furnace is vacuumed, argon is delivered into the high-temperature furnace, the temperature in the furnace is maintained at 1150 to 1300 DEG C for 0.5 to 2 hours, and the temperature is naturally reduced to room temperature; after the processes, the surface of the substrate on the second ceramic boat is covered by light blue semitransparent sediments with thickness above 1cm. The light blue semitransparent sediments are prepared ultra-long silicon carbide nano-wires. According to the invention, ultra-long silicon carbide nano-wires with thickness above 1cm and with a good quality are obtained with a simple chemical vapor deposition technology. Compared to prior preparation methods in which silicon-containing polymers and silicon tetrachloride are adopted as precursors, operation security is improved, and cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of silicon carbide nanowires, in particular to a preparation method of ultra-long silicon carbide nanowires. Background technique [0002] Ultra-long silicon carbide nanowires have important application prospects in the research of physical properties of one-dimensional nanostructures, the spinning of high-strength silicon carbide nanowires, advanced composite materials, and the manufacture of nano-optoelectronic devices. [0003] In recent years, many literatures have reported a method of preparing ultra-long silicon carbide nanowires by high temperature pyrolysis of silicon-containing polymers (polycarbosilane, hexamethyldisilane, hexamethylsilazane or polydimethylsilane). method. For example, the document "G.Y.Li, X.D.Li, Z.D.Chen, J.Wang, H.Wang, R.C.Che, J.Phys.Chem.C, 2009, 113: 17655-17660" discloses a high temperature thermal A method for preparing ultra-long silicon carbide nanowires. First, liq...

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): C01B31/36B82Y40/00
Inventor 魏剑陈晋
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY