What should be paid attention to when spraying tungsten carbide?

What should be paid attention to when spraying tungsten carbide?

When performing tungsten carbide spraying processing, the following aspects should be noted:

surface pretreatment

Thoroughly clean the surface of the sprayed workpiece to remove oil stains, rust, oxide layers, etc., to ensure the adhesion of the coating.

Using methods such as sandblasting and polishing to increase surface roughness and improve the bonding strength of the coating.

Quality of spraying materials

Ensure the quality of tungsten carbide powder, including particle size distribution, chemical composition, purity, etc., meets the requirements.

Dry the powder to prevent moisture from affecting the spraying effect.

Spray equipment debugging

The spraying equipment, such as spray gun, powder feeder and gas flow controller, shall be debugged in advance to ensure the stable operation of the equipment.

Set appropriate spraying parameters, such as spraying distance, spraying angle, spray gun movement speed, gas pressure, current, and voltage.

environmental control

Keep the spraying work environment clean and dry, and avoid dust and impurities from entering the coating.

Control the temperature and humidity of the working environment to ensure coating quality.

spraying process

Choose the appropriate spraying process, such as plasma spraying, supersonic flame spraying, etc., based on the requirements and actual situation of the workpiece.

When spraying multiple layers, attention should be paid to controlling the spraying interval and thickness between each layer to avoid delamination and peeling of the coating.

Coating inspection

After the spraying is completed, the coating should be tested in a timely manner, including thickness measurement, hardness testing, bonding strength testing, porosity testing, etc.

Repair or re spray the unqualified coating.

Operator skills

Operators should possess professional skills and experience, and be familiar with the operation of spraying processes and equipment.

Strictly follow the operating procedures to ensure the safety and quality of the spraying process.

safety protection

Due to the potential generation of dust and harmful gases during the spraying process, it is necessary to equip with good ventilation and protective equipment to ensure the health and safety of operators.