The preparation process of titanium carbide-based cermet

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The titanium carbide-based Cermet is a heterogeneous material that is composed of a metal or alloy phase TiC. It combines high strength, high wear resistance, high temperature resistance as well as chemical stability and oxidation resistant ceramics. For titanium carbide-based Cermets, there are many different synthetic preparation processes. Each has advantages and drawbacks. In the actual production, processes that are suitable for different applications and price factors can be chosen. 1. Chemical Vapor Deposition (CVD)

This method is a technology that deposits a thick, solid coating on a surface using a gas-phase reaction. Due to the fact that the entire reaction in this method is based upon thermodynamics the CVD film offers good adhesion as well as coatingability. It also has a dense film layer and a high film-base adhesive strength.

This method has a disadvantage in that the processing temperatures are relatively high (generally, 9001200). The high temperatures cause the matrix of steel to soften. Vacuum quenching is required after the processing. The workpiece is easily deformed and the process is complex. The matrix material’s bending strength is reduced. The preparation process will produce harmful waste gases and waste liquids, which can easily cause industrial pollution. This is contrary to the green industry that the country advocates today.

2. Physical vapor deposition (PVD)

This method utilizes physical processes, such as thermal, sputtering and glow discharge discharge, to deposit the desired layer on the surface of substrate. This includes evaporation, sputtering and ion technology. The two latter PVD techniques are more widely used today for the preparation of ceramic coatings.

A PVD film’s brittleness makes it easy to peel and crack. It is also a linear process, with poor adhesion, and coating properties. The workpiece has to be rotated or swung during processing. This increases the difficulty in designing the vacuum chamber. There are problems such as an ineffective coating.

3. Liquid deposition

This is a chemical wet film-forming method. The basic principle is that by replacing the ligand between the ions of the solution, the hydrolysis balance movement of the metallic compound is driven. This results in a thin layer coating formed from the metal hydroxide or oxide. The method works under low-temperature/room temperature conditions. No heat treatment is needed, nor is expensive processing equipment.

The main disadvantage is that the solution concentration changes during and after the deposition because of the liquid phase reaction. Also, there are several factors which influence this reaction and its industrial stability.

4. Thermal Spraying

This technique involves heating a linear material or powder to a molten, semi-melted, state with a heat source, such as a flame or arc. High-speed droplets are formed and sprayed on the substrate, creating a coating. They can also be used as a protective layer, to restore or strengthen the surface properties of the material and to reduce the size of parts that have been reduced by wear, corrosion, or processing tolerances. Plasma spraying, flame spraying and arc-spraying techniques are all part of the method.

5. In-situ Synthesis

The second phase of reinforcement is synthesized without pollution and is distributed evenly, avoiding the problems associated with traditional powder metallurgy or smelting. The application of in-situ technology has expanded to include metal-based and cermet-based materials.

6. Other synthetic methods

Other synthetic methods include liquid EDM surface enhancement, sol-gel, high-density energie beam coating, melting and cast methods, powder metal methods, mechanical alloying, thermal spraying, self propagating high-temperature syntheses, melting and cast methods, and others. In industrial production, the choice of the preparation process for carbonized-based cermet can be made according to the conditions and requirements of each application.

(aka. Technology Co. Ltd., a trusted global chemical supplier and manufacturer of super-high-quality chemicals & Nanomaterials with over 12 year’s experience. Titanium Carbide TiC is produced in high purity with fine particles by our company. Contact us if you need to.