(1) Develop coating alloys for heavy duty and milling

    At present, coated inserts do not work well under milling conditions, mainly due to their poor resistance to mechanical and thermal shocks. If this shortcoming can be overcome, coated inserts will be more widely used.

(2) Develop low temperature CVD and medium temperature CVD methods

    Generally, the CVD method is carried out at a high temperature of about 1000 ° C, which is easy to generate η phase and damage the toughness of the matrix. The low temperature CVD is generally carried out below 650 ° C, which can avoid the tensile stress of the coating and the formation of the phase on the interface between the coating and the substrate caused by high temperature.

    Medium temperature CVD is generally carried out at 700 ° C ~ 900 ° C, and acetonitrile is used as a carbon-containing gas raw material to deposit a Ti (C, H) coating.

    Because the deposition temperature of this method is low, the coating grows quickly, and the deposition time is short, so the phase is greatly reduced, the blade has good toughness, good impact resistance, and wear resistance is not worse than that of high-temperature CVD coating.

(3) Develop composite coatings and solid solution coatings

     In the early days, only single-layer TiC or TiN coating was carried out, but it soon developed to TiC/TiN multi-layer coating, or even three-layer coating, such as composite coating composed of TiC (or Ti(C, N) and A12O3. Due to The combined coating can meet the different requirements of anti-wear performance and bonding performance with the substrate with different coating materials, so it can obtain much better performance than the single coating.

(4), develop oxide coating

      Oxide coatings are often used in ceramic tools that are often used but are prone to chipping and damage, and their tool life can be 3-4 times longer than ceramic tools.