Bodycote Hot Isostatic Pressing

Extended Wear Life In Corrosive Environments

TECH 23 is a composite ceramic material thermochemically bonded to customer-specified areas on a part, including OD's and ID's and some out-of-sight holes and ports. Individual ceramic particles are sub-micron in size and consist of mixtures of selected ceramic materials bonded together and to the substrate. Porous after the initial formation of the ceramic, TECH 23 is densified using ceramic precursor chemicals plus corrosion resisting chemicals. When thermochemically converted into ceramic and corrosion protection in situ, the densification processes form additional bonds and mass within the initial ceramic body. Each densification cycle fills some of the remaining porosity until a fully dense, non porous, corrosion-resistant ceramic coating has been created.

BOND STRENGTH
TECH 23 develops a bond into the substrate through the formation of a spinel-like interface between the ceramic coating and the metal surface. Part of the thermo-chemical reaction causes the substrate metal atoms to migrate into the ceramic coating during initial processing. Like the Tech 22 coating, TECH 23's bond strength to the substrate is in excess of 10,000 psi.

DENSITY
TECH 23 is an almost totally dense (>97%) ceramic coating and has no open porosity. TECH 23 processing completely seals off open porosity, making the part impervious to most chemical attack.

HARDNESS
As with Tech 22, the TECH 23 coating particle hardness range measures from 1000 to 2850 Vickers. In sliding wear applications, the surface wears as a result of the hardest component, chromium oxide, which has a hardness of 2850 Vickers.

RESULTS
The unique combination of particle hardness, chemical bonding, and lack of porosity results in a coating which is unparalleled in wear resistance in corrosive environments. This has been proven in the field by the coatings use downhole, in hot 30% CaCI2 (calcium chloride) and in pumps running hot, 90% H2S04 (sulfuric acid). Life expectancies of parts used in these applications are now measured in years instead of days and weeks.

0.002 - 0.004 inches thick

Ultra fine grain size

Hardness range 1000-l850 Vickers

Surface finish adjustable from 5 - 60 Rms.

Chemically bonded

Low friction

Extreme wear resistance

Better resistance to corrosives

Resistant to thermal cycling/shock

Withstands 30% CaCl2, 90% H2SO4

TECHNICAL DATA

HARDNESS
1000-1850 Vickers

BOND MECHANISM
Chemical

BOND STRENGTH
Over 10,000 psi

THICKNESS
0.002 - 0.004 inches, typical

COEFFICIENT OF FRICTION
.22 - .23 against fibers
.1 - .13 against metal

CORROSION RESISTANCE
+560 hours in hot CaCl2 (no damage)

Tech 23 Ceramic