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Method for preparing titanium nitride fine powder by liquid-phase reduction

A technology of titanium nitride and powder, which is applied in the field of preparation of titanium nitride fine powder, can solve the problems of low production efficiency and high equipment requirements, and achieve the effect of simple production

Inactive Publication Date: 2005-09-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all need to be carried out at high temperature, the production efficiency is low, and the equipment requirements are high.

Method used

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  • Method for preparing titanium nitride fine powder by liquid-phase reduction
  • Method for preparing titanium nitride fine powder by liquid-phase reduction
  • Method for preparing titanium nitride fine powder by liquid-phase reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Raw material salt: TiCl4, 4 grams, reducing metal: Na, 2.64 grams;

[0034] Raw material salt ammoniation: room temperature, 0.5atm, 4 hours;

[0035] temperature

pressure

TiCl 4 - liquid ammonia solution

Na-liquid ammonia solution

mixing time

-55 / ℃

0.5 atmospheres

150ml

50ml

15 marks

[0036] Ammonia washing: 50ml, 30 times

[0037] temperature

Embodiment 2

[0039] Raw material salt: TiBr 4 , 10 grams, reduced metals: K, 4.47 grams

[0040] Raw material salt ammoniation: room temperature, 1atm, 2 hours

[0041] temperature

pressure

TiBr 4 - liquid ammonia solution

K-liquid ammonia solution

mixing time

-35 / ℃

1 atmosphere

200ml

75ml

20 points

[0042] Ammonia washing: 50ml, 35 times

[0043] temperature

time

atmosphere

600 / ℃

3 hours

the vacuum

[0044] Black fine powder was obtained through the above examples. The chemical composition of the powder was analyzed and the data are listed in Table 1. It can be seen from the analysis results that the molar ratios of titanium and nitrogen in the powder are 1:0.87 and 1:0.893, which are close to 1:1, and it can be speculated that the main component of the powder is TiN.

[0045] The powder contains a certain amount of oxygen, which may mainly come from the mixing of a small...

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Abstract

The present invention provides a method for preparing titanium nitride fine powder by utilizing liquid-phase reduction method, which is characterized by that it uses halide or one kind of titanium as raw material, uses alkali metal or alkaline earth metal as reducing agent, and makes them produce reaction in liquid ammonia medium and utilizes the processes of liquid-phase separation, drying and heat treatment to prepare out the invented fine titanium nitride powder.

Description

technical field [0001] The present invention relates to a preparation method of titanium nitride fine powder, in particular to a method for preparing titanium nitride fine powder by mixing and reacting titanium halide and reducing metal in liquid ammonia. . Background technique [0002] Titanium nitride TiN has a high melting point (2950 ° C), hardness, good electrical conductivity, chemical stability and thermal stability. Therefore, titanium nitride is used for surface coatings, high temperature and corrosion resistant materials, hard alloys, sprayed protective layers and electrode materials. Titanium nitride is often used in powder form in these applications. The existing synthesis methods of TiN powder can be divided into two categories: one is the direct nitriding method of metal titanium powder, and the representative literature records are as follows: [0003] 1.P.V Ananthpadmanabhan, Patrick R.Taylor, Wenxia Zhu.Synthesis of titaniumnitride in a thermal plasma rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/076C01G23/00
Inventor 朱鸿民袁勃艳孙根生
Owner UNIV OF SCI & TECH BEIJING