Preparation system and preparation method of TiN, TiC and TiCN powder

A technology of powder and inert gas, which is applied in the preparation process of TiCN powder, TiC and TiN, can solve the problems of difficult fluidization, low efficiency and high temperature of powder, and achieve economical raw materials, simple process flow and simple equipment Effect

Active Publication Date: 2019-08-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention provides a preparation system and method for TiN, TiC and TiCN powders. The key problem to be solved is to break through the ultrafine Ti powder and TiH in the traditional direct nitriding process. 2 The powder is difficult to fluidize, while the coarser Ti powder and TiH 2 The powder needs repeated crushing and nitriding or (and) carbonization to synthesize TiN, TiC, and TiCN powders. At the same time, it solves the problem of 4 The problem of high temperature and low efficiency in the traditional chemical vapor deposition process of titanium source is proposed, and a process capable of preparing TiN, TiC, and TiCN powders in large-scale batches is proposed

Method used

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  • Preparation system and preparation method of TiN, TiC and TiCN powder
  • Preparation system and preparation method of TiN, TiC and TiCN powder
  • Preparation system and preparation method of TiN, TiC and TiCN powder

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Experimental program
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Effect test

Embodiment 1

[0047] Combine figure 1 , The preparation system of TiN, TiC, TiCN powder in this embodiment includes a powder feeding device 1, TiCl 4 Evaporation device 2, heating device 2-1, pre-reaction fluidized bed 3, first cyclone separation device 4, first high temperature dust removal device 5, powder synthesis fluidized bed device 6, second cyclone separation device 7, second high temperature Dust removal device 8, first water cooling device 9, powder collection device 10, second water cooling device 11, TiCl 4 Recovery device 12, tail gas treatment device 13;

[0048] The air inlet at the bottom of the powder feeding device 1 is connected with an inert gas pipeline through a gas valve and a pipeline; the outlet at the bottom of the powder feeding device 1 and the inlet at the bottom of the pre-reaction fluidized bed 3 pass through The valve is connected to the pipeline;

[0049] The TiCl 4 The evaporation device 2 is equipped with the heating device 2-1; the TiCl 4 The air inlet of the ...

Embodiment 2

[0057] In this embodiment, the method for preparing TiN, TiC, and TiCN powders using the system in the above embodiment 1 specifically includes the following steps:

[0058] After the titanium-containing powder is cleaned by inert gas in the powder feeding device 1, it is transported to the pre-reaction fluidized bed 3 through a feed valve; the inert gas passes through the TiCl 4 Evaporator 2 puts gaseous TiCl 4 Loaded into the pre-reaction fluidized bed 3; the inert gas entering the bottom of the pre-reaction fluidized bed 3 maintains the titanium-containing powder in a fluidized state, and pre-reacts to obtain the pre-reaction product powder; the pre-reaction product powder The body enters the powder synthesis fluidized bed device through the discharge port of the pre-reaction fluidized bed 3, the discharge port of the first cyclone separation device 4, and the discharge port of the first high-temperature dust removal device 5 6; In the powder synthesis fluidized bed device 6, t...

Embodiment 3

[0061] In this embodiment, on the basis of the above embodiment 2, the titanium-containing powder in the powder feeding device 1 is TiH 2 Powder with a purity of 99% and a particle size of 5μm; the inert gas is Ar; the nitrogen source gas is N 2 , H 2 The molar ratio of N to the nitrogen source is 1; the TiCl 4 The temperature of the evaporation device 2 is 30°C; the temperature in the pre-reaction fluidized bed 3 is 530°C, in which TiCl 4 With TiH 2 The molar ratio of the powder is 0.5, and the average residence time of the powder is 30 min; the temperature of the powder synthesis fluidized bed device 6 is 700°C, and the average residence time of the powder is 30 min; the nitrogen in the powder synthesis fluidized bed device 6 The molar content of N in the source gas and the TiCl in the pre-reaction fluidized bed 3 4 And the total molar ratio of Ti in the titanium-containing powder is 1. figure 2 To prepare the SEM scan picture of TiN powder, the average particle size of TiN pow...

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Abstract

The invention discloses a preparation system and preparation method of TiN, TiC and TiCN powder. Coarse titanium-containing powder is transported to a powder synthesis fluidized bed after pretreatmentin a pre-reaction fluidized bed, and then is directly nitrided or (and) carbonized into fine the TiN, TiC and TiCN powder in the atmosphere of a nitrogen source and a carbon source. According to theinvention, the synthesis temperature of the TiN, TiC and TiCN powder is reduced, the processes of multiple crushing, repeated nitridation or (and) carbonization in the traditional direct nitridation or (and) carbonization process are overcome, the powder preparation efficiency is improved, the problem of low nitridation or (and) carbonization efficiency of a TiCl4 titanium source in the traditional process is solved, the utilization rate of the raw material is improved, the process flow is simple, continuous batch production of the TiN, TiC and TiCN powder can be realized, and the method is suitable for large-scale industrial production, and has good economic and social benefits.

Description

Technical field [0001] The invention belongs to the fields of chemicals and materials, and relates to a preparation method of powder, in particular a preparation process of TiN, TiC, and TiCN powder. Background technique [0002] TiN, TiC, TiCN cermets have excellent properties such as high melting point, high hardness, corrosion resistance, wear resistance, strong oxidation resistance, and good electrical and thermal conductivity. They are used in mechanical processing, aerospace, petrochemical, electronic information, and bioelectricity. It has a wide range of applications in chemistry and other fields. For example, TiN, TiC, TiCN can be used as tool materials, mold materials, anti-corrosion materials, conductive ceramic materials, electrode materials, decorative materials, energy-saving materials, wear-resistant materials, and biocompatible materials. TiN, TiC, TiCN powder is the basis for preparing these high-performance TiN, TiC, TiCN materials. After decades of continuous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/076C01B21/082
CPCC01B21/076C01B21/0761C01B21/0763C01B21/0828C01B32/921C01P2002/85C01P2004/03C01P2004/61
Inventor 朱庆山向茂乔宋淼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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