There are many thermal spray ceramic materials.In theory, the plasma spray process can spray all solid engineering materials, but not all ceramic materials can be used as thermal spray.Some ceramic materials can be used after changes or special treatments.Others are only It can not be used as a raw material for thermal spraying. Thermal spraying ceramic coating raw materials. In addition to the thermal spraying raw materials considering the basic regulations, metal thermal spraying also has some special circumstances.
(1) For ceramic materials like carbide, graphite, diamond and other easily oxidized burns, they cannot be used immediately. Be sure to carry out coating treatment with heat-resistant and oxidation-resistant metals and turn them into metal-ceramic composite powders before they can be used as heat. Spray raw materials.
⑵ For ceramics with high vapor pressure and volatile sublimation at high temperature, such as magnesia, Ca2CO3, SiO2, etc., cannot be used as raw materials for thermal spray immediately.
⑶ For ceramic materials such as ZrO2 and TiO2 that will undergo crystal type transformation when the temperature changes, modification treatment is usually required, or high-temperature ceramic materials are selected.
What are the commonly used raw materials for thermal spraying
In practice, we divide thermal spraying raw materials into wire (rod) material spraying raw materials, powder spraying raw materials, brazing raw materials and auxiliary materials according to types.
Thermal spray wire (rod) material is divided into flame spraying and arc spraying wire (rod) materials.
The raw materials for thermal spray powders are divided into metal and alloy powders, self-fusible alloy powders, abradable coating powders, ceramic powders, cermet powders, and composite powder raw materials.
The key materials for brazing include coating materials that need to be subjected to diffusion heat treatment after the thermal spraying process.
The auxiliary materials include raw materials for sandblasting, masking raw materials and sealing raw materials.
Development trend of thermal spray material market
The key includes precision parts for the aerospace industry, automobiles, medical instruments and industrially produced gas turbines. The application of thermal spray coatings in the biomedical and medical device industries will help to improve their wear resistance and biocompatibility, and will also have an effect on the implantation of dentures.
The continuously expanding scope of application also includes ships, locomotives, tanks, helicopters and motorcycle gas turbines, which have also accelerated the prosperity of the thermal spray coating market. Taking full account of the high temperature corrosion resistance and other characteristics, thermal spray coatings of polymers and metals are usually used in the form of powders for industrial production of gas turbine blades.
