This is a technology that deposits a thick, solid coating on the surface a substrate using a gas-phase reaction. This method’s entire reaction is based upon thermodynamics. As a result, the CVD films have good adhesion properties, a dense film layer and incredibly high bond strength between the film and the base.
The processing temperature of this method (generally, 9001200) is high. 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, which reduces the bending resistance of the matrix. Decrease, and hazardous waste liquid and gas will be produced in the preparation process. This is easily to cause industrial pollution and contradicts the green industries advocated by this country.
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 substrate surface. This includes sputtering, ion and evaporation 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. This is 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. Problems like 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 the deposition on the substrate of a thin layer coating. 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 liquid phase reaction is highly unstable and has many influences.
4. Thermal Spraying
This technique involves heating linear materials or powders into a molten, semi-melted, state by using heat sources such as flames, arcs, or plasma. 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 material’s surface performance, or to regenerate it. Plasma spraying, flame spraying, or arc-spraying techniques are all part of the method.
5. In-situ Synthesis
The second phase or reinforcing particles in the composite are generated in situ. This means that they do not exist before the material has been prepared. 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, melting and cast methods, self-propagating heat-temperature synthesis and thermal spraying. 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 reputable global chemical material manufacturer and supplier with more than 12 year’s experience in the production of high-quality nanomaterials and chemicals. Titanium Carbide TiC is produced in high purity with fine particles by our company. Contact us if you need to.
