High Temperature Refractory Coatings

Tech Bulletin A5-S5

Aremco’s Graphi-Coat™ and Pyro-Paint™ refractory coatings offer the ultimate protection of high temperature components used in the processing of ceramics, glass, metals, and plastics.

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Product Highlights

Product	Features
623	This patented coating is a two-part, silica-bonded, titanium diboride filled, oxidation resistant coating for protecting graphite crucibles, electrodes, and heat-treating fixtures to 2000 ºF (1093 ºC).
634-AL	This high purity alumina, two-part coating seals alumina fiberboards and shapes to fill porosity and resist molten metals to 3200 ºF (1760 ºC). Increases heat reflectivity to improve furnace efficiency by reducing ramp up times.
634-AL-HC	This high purity 99+% alumina, single-part coating bonds well to carbon and stainless steel, providing excellent oxidation protection. Also suitable for producing a hard-coat on alumina fiberboards. For temperatures to 3200 ºF (1760 ºC).
634-ALP	This phosphate-bonded, single-part alumina coating bonds exceptionally well to dense refractories, providing high abrasion and corrosion resistance for operating temperatures to 3200 ºF (1760 ºC).
634-AS 634-AS1	These alumina-silica, single-part coatings increase the durability of refractory fiberboards by sealing the substrate to minimize dusting and resist wetting by non-ferrous metals to 2300 ºF (1260 ºC).
634-BN 634-BNSC	These lubricious, boron nitride, single-part coatings are used to seal refractory fiberboards and metals from wetting by nonferrous metals, salts, glasses and plastics. Select 634-BN for hard-coat and 634-BNSC for a more consumable soft-coat.
634-GR	This single-part graphite coating improves parting of aluminum permanent molds, non-sticking in glass forming, and lubrication and stop-off in metalworking and wire drawing. Provides superior release, surface finish and mold protection.
634-SIC	This single-part, silicon carbide coating improves the oxidation resistance of graphite crucibles, electrodes, and heat-treating fixtures to 2550 ºF (1400 ºC).
634-SIC-CS	This single-part, silicon carbide coating resists oxidation of metals at temperatures to 2300 ºF (1280 ºC).
634-YO	This single-part, yttrium oxide coating protects graphite, ceramic and metals, exposed to reactive metals such as titanium, uranium and their alloys under inert or vacuum atmospheres to 2732 ºF (1500 ºC).
634-ZO	This single-part, zirconium oxide coating produces a hard, oxidation resistant coating on carbon and stainless steel and a range of refractory metals including molybdenum, platinum, rhodium, and titanium to 3270 ºF (1800 ºC). Good for sealing porous refractories and protecting resistance heating elements from oxidation and residue buildup that causes arcing and reduced element life.

Typical Applications

Composite Forming
Glass Forming
Metal Casting
Injection Molding
Ceramic Hot-Pressing
Metal Powder Sintering
Welding
Brazing

Product Highlights

Ultra Hi-Temp Resistance
Non-Wetted by Molten Metals, Salts, Glass & Plastics
High Lubricity for Easy Part Release
Minimizes Cast Surface Defects
Increases Mold & Die Life
For Use in Oxidizing, Reducing & Vacuum Atmospheres