Technologies
Technologies checked by the time
Gas-thermal spraying -- process of heating, dispergating and transferring the warmed particles by the gas stream to basis surface.
Oxygen or compressed air can move to gas-thermal installations.
Gas-thermal spraying, air-plasma and laser cladding provide equipment effective protecting and solve the following problems:
- abrasive wear;
- high-temperature corrosion;
- chemical corrosion;
- cavitation;
- galvanic corrosion;
- intercrystalline corrosion;
- and so on.
Advantages:
- Working life increase in several times due to surface working properties improvement;
- Increase in production competitiveness;
- Decrease in material capacity and power consumption when processing products;
- Cutting of costs for repair and purchase of new parts, knots and equipment;
- Processes automation allows to provide stable quality of coatings;
- Wide range of coating equipment provides optimal coating solution;
Advantages of gas-thermal coatings in comparison with galvanic chromium plating:
| Coating process | Galvanic chrome | HVOF | |||
| Coating material | Cr | WC-Co | WC-Co-Cr | WC-CrC-Ni | Cr3C2-NiCr |
| Hardness, HV 300 | 750-850 | >1000 | >1050 | >1100 | 900-1100 |
| Adhesion, mPa | 41 | >70 | >80 | >80 | >80 |
| Porosity | - | <1% | <1% | <2% | <1% |
| Corrosive resistance test (ASTM B117), hrs | 55-72 | 216-250 | 672-720 | 600-650 | 672-720 |
| Heat resistance, grade oС | 400 | 550 | 550 | 550 | 950 |
| Environment pollution | High waste toxicity. Big costs of cleaning | Low-toxic waste, dust-like fraction | |||
| Microstructures (25 mkm) |
|
|
|
|
|