Sialon quasi monodimension nanometer material and its preparation method

Abstract

This invention involves a Sialon quasi-one dimensional material, its raw material accordance to weight percentage includes: hydrogen silicone 37% to 55%, ethylenediamine 43% ~ 60%, Al powder 2% ~ 10%; Their preparation methods include the following steps : 1.in accordance with the percentage of weight take hydrogen silicone, ethylenediamine, Al powder, mixed in Reactor reaction, the reaction temperature is controlled at 0 ~ 00deg, under the conditions of constant stirring for 8 to 12 hours, obtain Si-Al-O-N - C polymer; 2. put the product of above step in graphite crucible, and then put the graphite crucible in atmosphere pressure sintering furnace, leads to nitrogen, control the furnace nitrogen pressure at 0.5 to 1.5 MPa and temperature at 1200 ~ 1500 deg for two to three hours, to obtain sialon quasi-dimensional materials in graphite crucible by crystallization. Its excellent dielectric properties, high mechanical strength, heat-resistance properties and thermal conductivity, and preparation of simple, low production cost, high yield, good uniformity of crystallization.

Description

technical field [0001] The invention relates to a nano material and a preparation method thereof, in particular to a Sialon quasi-one-dimensional nano material and a preparation method thereof. Background technique [0002] Nanotechnology is considered to be the most important science and technology in the 21st century. Nanoscience and technology will change the properties of almost every man-made substance, and major improvements in material performance and major changes in manufacturing methods will cause a new industrial revolution in the new century. In 1991, Iijima discovered carbon nanotubes, and its unique structural characteristics and physical and chemical properties set off a research boom worldwide. After that, people prepared MoS 2 、WS 2 , BN, GaN nanotubes and Si, Ag, CdTe, GaN nanowires and other new one-dimensional nanomaterials, and developed a series of new preparation methods for one-dimensional nanomaterials. Due to the special transmission characteris...

AI Technical Summary

Problems solved by technology

At present, the synthesis methods of quasi-one-dimensional silicon nitride nanomaterials similar to Sialon structure mainly include: (1) carbon nanotube confinement growth method: carbon nanotubes are used as membrane plates, and silicon oxides or halides are used as silicon sources , synthesized Si in a large amount of nitriding atmosphere 3 N 4 Nanowires, this method needs to synthesize carbon nanotubes first, and the process is more complicated; (2) arc discharge method, laser ablation method: synthesize Si at high temperature by arc discharge or laser ablation technology 3 N 4 Nanowires, the disadvantage of this method is low yield and more impurities; (3) chemical vapor deposition (CVD) method: this method is generally formed by silicon powder, silicon oxide powder or silicon-containing halogen in a high temperature or plasma environment Silicon vapor reacts with the nitriding atmosphere, and grows silicon nitride nanomaterials by the VLS mechanism through impurity nucleation on a certain cooling substrate. This method has a low yield and certain impurities; (4) hydrothermal synthesis method; ( 5) Carbothermal reduction method