MODUK DEF STAN 02-828 PDF

This Defence Standard (Def Stan) 02-828 defines the requirements for thermal spray deposition of coatings using automatic, semi-automatic or mechanised methods onto engineering components to enhance the surface properties or reclaim worn, damaged and non-conforming parts. The coatings shall be metallic, ceramic or cermet (see Definitions) and their purposes may be for the following:

a) Corrosion, heat, or oxidation resistance;

b) Wear resistance;

c) Dimensional reclamation;

d) Electrical conductivity or resistivity;

e) RF shielding;

f) Machine seal clearances.

The following thermal spraying processes are approved for use:

a) Flame spraying using wire, powder, rod or cord consumables;

b) Arc spraying using wire consumables;

c) Plasma spraying using powder, rod or wire;

d) Detonation spraying using powder

e) High velocity oxy-fuel (HVOF) spraying using powder or wire.

Manual spraying, i.e. hand held spray gun is prohibited.

This Standard does not cover the thermal spraying of zinc and/or aluminium coatings for the protection of steel structures from atmospheric corrosion. See BS EN ISO 2063.

This Standard does not cover coatings produced by weld overlay cladding or the plasma transferred arc process, which are classified as welding processes. See Def Stan 02-875.

The Argon Shrouded Plasma and Vacuum Plasma spraying techniques, which utilize inert gas atmospheres, at atmospheric and low pressure respectively, to deposit dense, essentially oxide- free coatings onto metallic substrates, require specialized technical support and are therefore beyond the scope of this standard.

This Standard does not apply to coatings of self-fluxing alloys, which are subsequently fused. See BS EN ISO 14920.

This Standard does not cover Cold Spray processes, which use metallic powders, which are propelled in the solid state at high velocity by an inert compressed gas to deposit coatings and restore component dimensions. Certain substrate-coating combinations do not require the use of surface preparation methods used for the thermal spraying processes covered by this standard. Load-bearing repairs are possible with this technology but require specialized technical support and qualification. See BS EN ISO 14921, MIL-STD-3021 and MIL-DTL-32495A.