In rotating systems such as compressors and Turbo machinery the clearance between blade tips and the casing must account for thermal and inertial expansion as well as changes in concentricity due to shock loading events. To prevent catastrophic tip to casing contact, conservatively large clearances must be provided. An abradable coating is a coating made of an abradable material which wears itself out in events as specified above whereas the latter will face no wear. Therefore the role of abradable coatings is not only to allow for closer clearances but also to automatically adjust clearances.
Abradable coatings are used in aircraft jet engines in the compressor and turbine sections where a minimal clearance is needed between the blade tips and the casing. Abradable materials deposited by Plasma process provide good sacrificial properties to the component thereby improving its operational life. Few Abradable coatings suggested by us are :
| Material Category | Material Code |
|---|---|
| Abradables | - E71X - E72 - E82 - E83 |
Many components used in critical applications such as Oil & Gas, Air & Gas Compressors, Power Generation etc. are worn out in service beyond a point where it can be refurbished directly by applying the top coat. Stripping the top coat often highlights surface irregularities and defects such as pin holes, blow holes, pittings, cracks etc. which is not ideal for deposition of thermal spray coatings. Conventional surface treatment methods also fail in these situations due to coating thickness limitations and other process constraints.
Dimensional restoration of parts such as shafts and rings can be done through Twin Wire Arc Spray process by depositing a range of our WC Alloy materials. To achieve higher wear resistance and optimal coating properties, the base coat is followed by a top coat of superior coating material such as alloy or carbide deposited through Plasma or HP-HVOF process. These coatings are ground to achieve the desired dimensions and tolerances. Few coatings suggested by us for Dimensional Restoration are :
| Material Category | Material Code |
|---|---|
| Alloys & Metal Blends | - EC14X - EC16X - EC20X - EC21X - C14X - C16X |