Processes

Ceramic Coatings

Ceramic Coating rebuilding

The application of Chromium and Alumina Oxides (Ceramics) by either Plasma or Oxy/Gas techniques protects components from a range of wear inducing factors.

This process is particularly effective in severe operating environments such as those encountered in the Petrochemical Industry.


Material Requirements

Chromium and Alumina Oxide

Coatings are recommended for resistance to wear by abrasive grains, hard surfaces, particle erosion and cavitation, at all temperatures below 1000°F (540°C).

These coatings have excellent self-mating and anti-galling properties.

Coatings of this material are insoluble in acids, alkalis and alcohol and offer protection in corrosive chemical environments in temperatures up to 350-400°F (175-200°C)

Application

Chromium and Alumina Oxide coatings are being successfully used in petro-chemical industry applications :

  • Pump impellers
  • Pump sleeves
  • Reciprocating pump compressor rods
  • Centrifugal pump seals
  • Wear and casing rings

Ceramic Coatings Provide Protection from:

Abrasion

Stray abrasive particles, caught between mating surfaces cannot gouge a hard ceramic coating.

Friction

Marginal lubrication is countered by the low friction coefficient of ceramic coatings, also the minute surface pores hold oil and therefore act as self-lubricating reservoirs.

Galling

Particle pull-out, caused by spot welding of mating surfaces is prevented by the anti-galling properties of ceramic coatings.


Corrosion

Unlike metals, ceramics do not oxidize due to heat or moisture, therefore there are no wear-causing oxides to wipe away in service.

Erosion

Almost any material available in wire form may be applied. Examples are stainless steels, Babbitt, bronzes, molybdenum, aluminium, etc. The composition of sprayed metal is chemically and physically different from the original wire. Generally it is harder and more porous than its equivalent in cast or wrought form.