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System and method for preparing TiN, TiC and TiCN coating through fluidized beds

A fluidized bed and coating technology, applied in coating, metal material coating process, gaseous chemical plating, etc., can solve the limitation of TiN, TiC, TiCN coating application range, TiN, TiC, TiCN coating device Expensive, difficult to mass-produce and other issues, to achieve the effect of efficient preparation, low cost, and precise preparation

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

AI Technical Summary

Problems solved by technology

Although this method proposes a fluidized bed that is easy to industrialize to prepare TiC coatings, there are many by-products in the process, and the coatings contain Al, Fe, TiO x 、TiN x and other impurities, resulting in lower quality of prepared coatings
[0005] To sum up, the temperature for preparing TiN, TiC, and TiCN coatings by traditional processes is high, far exceeding the heat treatment temperature or phase transition temperature that general metal substrates can withstand, which limits the application range of TiN, TiC, and TiCN coatings. At the same time, the existing The process preparation cost is high, the efficiency is low, and it is difficult to produce on a large scale, resulting in very expensive prices for TiN, TiC, and TiCN coated devices

Method used

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  • System and method for preparing TiN, TiC and TiCN coating through fluidized beds
  • System and method for preparing TiN, TiC and TiCN coating through fluidized beds
  • System and method for preparing TiN, TiC and TiCN coating through fluidized beds

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Embodiment 1

[0054] combine figure 1 , the system used in this embodiment to prepare TiN, TiC, TiCN coatings, including:

[0055] Powder feeding device 1, pre-reaction fluidized bed 2, deposition fluidized bed 3, TiCl 4 Recycling device 4, base 5;

[0056] The powder feeding device 1 includes a powder storage tank 1-1 and a screw feeder 1-2;

[0057] The pre-reaction fluidized bed 2 includes TiCl 4 Evaporator 2-1, pre-reaction fluidized bed main body 2-2, pre-reaction fluidized bed cyclone separator 2-3, pre-reaction fluidized bed discharger 2-4, fine powder recovery storage tank 2-5, high temperature Dust collector 2-6; heating device 2-7;

[0058] The deposition fluidized bed 3 includes a deposition fluidized bed main body 3-1, a deposition fluidized bed cyclone separator 3-2, and a residual powder recovery storage tank 3-3;

[0059] The TiCl 4 Recycling device 4 includes TiCl 4 Condenser 4-1, TiCl 4 Recovery storage tank 4-2;

[0060] The bottom outlet of the powder storage tan...

Embodiment 2

[0066] In this embodiment, the above-mentioned system is used to prepare TiN, TiC, TiCN coatings, and the specific method includes the following steps:

[0067] (1) The titanium-containing powder raw material enters the pre-reaction fluidized bed main body 2-2 from the powder storage tank 1-1 through the screw feeder 1-2;

[0068] (2) Inert fluidization gas passes through the TiCl 4 Evaporator 2-1 loaded with TiCl 4 After entering the pre-reaction fluidized bed main body 2-2, the TiCl at a certain temperature 4 Pretreat the titanium-containing powder raw material in the atmosphere, and maintain the fluidized state of the powder material;

[0069](3) After pretreatment, the powder material enters the sedimentation fluidized bed main body 3-1 through the pre-reaction fluidized bed discharger 2-4, the cyclone separator 2-3, the high temperature dust collector 2-6 The separated fine powder enters the sedimentation fluidized bed main body 3-1 through the fine powder recovery sto...

Embodiment 3

[0074] In this embodiment, metal titanium powder (purity 98%, average particle size 40 μm), TiCl 4 (purity 99%), nitrogen (purity 99%) as raw materials, high-speed steel as the substrate; in the pre-reaction fluidized bed, TiCl 4 The temperature of the evaporator is 30°C, the carrier gas is Ar gas, and the titanium powder is in a fluidized state, TiCl 4 The molar ratio to Ti is 0.5, the reaction temperature is 550°C, and the average residence time of the powder is 180min; the pretreated powder enters the sedimentation fluidized bed through the discharger, and the solid material enters the sedimentation fluidized bed in the Ar gas It is in a fluidized state under the action, and the temperature is maintained at 900 ° C; N 2 , Ar mixed gas, N 2 , The volume ratio of Ar is 1:5, the average residence time of solids in the deposition fluidized bed is 30min, and the TiN coating is coated on the substrate suspended near the upper air inlet of the deposition fluidized bed. figure ...

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Abstract

The invention discloses a system and a method for preparing a TiN, TiC and TiCN coating through fluidized beds. The method comprises the following steps of pretreating a titanium-containing powder rawmaterial in a pre-reaction fluidized bed, transferring the raw material into a deposition fluidized bed, and then uniformly depositing the TiN, TiC and TiCN coating on a substrate in the deposition fluidized bed. The system and the method for preparing the TiN, TiC and TiCN coating have the following advantages that (1), the fluidized bed process has good heat transfer and mass transfer characteristics, so that directional reduction and accurate control of the pretreatment process are realized, and an effective precursor is efficiently obtained; (2), the temperature for preparing the TiN, TiCand TiCN coating by taking low-price TiCl4 as the raw material is obviously reduced, and the utilization rate of the raw material is improved; (3), the shape of the coating substrate is not limited,the method and the system are especially suitable for uniformly coating a part with a complex shape with the TiN, TiC and TiCN coating; and (4), the process is simple, the equipment is economical, theTiN, TiC and TiCN coating can be prepared in a large-scale batch manner, and the good economic and social benefits are achieved.

Description

technical field [0001] The invention belongs to the fields of chemical industry and materials, and in particular relates to a system and method for preparing TiN, TiC and TiCN coatings. Background technique [0002] TiN, TiC, and TiCN coatings have the advantages of high hardness, good wear resistance, and good chemical stability, as well as good electrical conductivity and superconductivity. They have extensive applications in the fields of structural materials, functional materials, and superconducting materials. Application prospects. At present, the methods for preparing TiN, TiC, and TiCN coatings mainly include the following two categories: [0003] (1) Additional methods, such as thermal spraying, laser cladding, etc. For example, Chinese patent CN1055308A discloses a method for preparing a titanium nitride coating by thermal spraying, which uses nitrogen as the propellant gas and titanium metal as the raw material to atomize the metal and form a TiN coating on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/30C23C16/32C23C16/34C23C16/448
CPCC23C16/30C23C16/32C23C16/34C23C16/4481C23C16/4487
Inventor 朱庆山宋淼向茂乔
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI