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Preparation of conductive titanium nitride/silicon nitride nano composite material

A nano-composite material, silicon nitride technology, applied in the direction of nitrogen compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high cost, high brittleness, difficult processing, etc., and achieve simple process, easy composition, and fine particles Effect

Inactive Publication Date: 2009-07-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its brittleness, difficult processing and high cost have limited its practical application.
After that, single nitrides of other metals were also synthesized, but the direct preparation of multiple metal nano-nitrides at low temperature has not been reported yet.

Method used

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  • Preparation of conductive titanium nitride/silicon nitride nano composite material
  • Preparation of conductive titanium nitride/silicon nitride nano composite material
  • Preparation of conductive titanium nitride/silicon nitride nano composite material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Example 1 Co-precipitated TiN / Si 3 N 4

[0042] Design TiNvol% = 40, raw material: TiCl 4 5 g; SiCl 4 5.8 grams; reducing agent: Na 5.7 grams

[0043] Preparation and post-treatment process parameters are:

[0044] ammoniation temperature ammoniation time temperature reflex Reaction time 0℃ 12 hours -40℃ 2 hours

[0045] Ammonia wash temperature

Ammonia washing times

heat treatment gas

atmosphere heat treatment temperature

Holding time

-45℃ 100 times vacuum 950℃ 2 hours

[0046] The SPS parameter control is:

[0047] Sintering temperature

example 2

[0048] Example 2 Co-coated TiN / Si 3 N 4

[0049] Design TiNvol%=15, wherein the volume percentage of TiN in the nanocomposite powder is 50%, and the volume percentage of the nanocomposite powder is 30%. Raw material: TiCl 4 5 g; SiCl 4 5.8 g; Si 3 N 4 4.56 grams; reducing agent: Na 5.7 grams

[0050]

[0051] The SPS parameter control is:

[0052] Sintering temperature

Spend

Heating rate

put pressure on

Holding time

1500℃

100°C

/ min

50MPa

3 minutes

[0053] The density of the sintered body material obtained by the above-mentioned preparation process is different according to the difference of the sintering temperature, the holding time and the applied pressure, and it is all above 95% within the parameter control range of the present invention. When the TiN content is only 15vol% in Example 1, The resistivity of the sintered body was reduced to 1.51×10 -3 Ω·cm, which can meet the re...

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Abstract

The invention belongs to the field of conductive composite ceramics, and relates to a method for preparing a conductive titanium nitride / silicon nitride nano composite material. The method is characterized by comprising the following steps: under the low-temperature liquid phase condition, simultaneously reducing TiCl4 and SiCl4 as raw materials at a temperature of between 50 DEG C below zero and 20 DEG C to directly obtain TiN / Si3N4 co-precipitation type composite powder; and directly preparing the composite powder co-coated by nano TiN and nano Si3N4, wherein the composite powder can form cores on the surface of silicon nitride micron or sub-micron particles. By controlling the content of TiN in the nano composite powder, the nano conductive composite material meeting electric spark processing (EDM) can be obtained. The titanium nitride / silicon nitride nano composite material has the advantages of even components, fine particles, simple and convenient process, low energy consumption, and popularization prospect.

Description

technical field [0001] The invention belongs to the field of conductive composite ceramics, in particular to nano-conductive titanium nitride (TiN) / silicon nitride (SiN) 3 N 4 ) method for the preparation of composite materials. Background technique [0002] Silicon nitride (Si 3 N 4 ) and other ceramic materials have the advantages of high strength, high hardness, light weight, high temperature resistance, good chemical stability, corrosion resistance, wear resistance and good thermal conductivity. They are important structural materials, especially in high temperature applications, the most promising It is one of the most promising materials and widely used in machinery, chemical industry, aerospace and many other fields. However, its brittleness, difficult processing and high cost have limited its practical application. Therefore, in order to solve the above problems, the preparation of conductive composite ceramics is an effective way to improve performance by addin...

Claims

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Application Information

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IPC IPC(8): C01B21/076C01B21/068C04B35/628C04B35/58C04B35/584C04B35/622
Inventor 朱鸿民杨梅吕明利邱海龙
Owner UNIV OF SCI & TECH BEIJING
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