Special Coatings & Glue

Products for very special applications

Cera Glue AA

Cera Glue AA is a fiber-free, ready-to-use, water-based, high-temperature-use (up to nearly 1500 C [2732 F]) bonding glue for Alumina-to-Alumina or for bonding high-Alumina content ceramics to one another.  Cera Glue bonds parts together dramatically, creating a strong adhesive connection of the pieces.  Also this glue can be used with dense or porous surfaces: just apply two coats to both faces to be bonded, drying between each coating at room temperature or at 60 C, followed by heating up to at least 1500 C in any atmosphere for around ½-2 hours.  NOTE that this product DOES NOT contain Boron Nitride.

Key Attributes
  • Specifically designed for Alumina-to-Alumina or for high-Alumina parts
  • Usable to nearly 1500 C, higher than other bonding agents
  • Glue is highly stable/unreactive with many materials – even molten ones
  • Provides very strong joining of parts
  • YAG (YAG, 3Y2O3*5Al2O3) based, phosphate-refractory bonded
  • Contains no RCF (Refractory Ceramic Fiber)
  • Water-based – easy cleaning and diluting if needed
Ideal Use
  • Bonding parts
  • Glue-repair of broken or chipped ceramic/refractory parts
  • Hermetically sealing tubes and bonded parts
  • Creating large complex parts from separately sintered components

Link to PDF datasheet: Cera Glue AA

Cera Glue Sealcoat

Cera Glue – Sealcoat is a water-based coating that can glue ceramic pieces as well as forming a vitreous impervious seal on most ceramics that withstands thermal cycling.  This product requires a one-time bake-on at 800-850 C for ½ to 1 hour for use up to nearly 800 C (1472 F).

Key Attributes
  • Bonds ceramics
  • Vitreous layer of non-silica ‘glaze’
  • Applied like house paint
  • Safe, water-based
Ideal Use
  • Gluing ceramic pieces and boards
  • Sealing ceramic surfaces from gaseous

Link to PDF datasheet:  Cera Glue Sealcoat

Type T

Type T is a relatively-soft, washcoat-type of  Titanium Carbide coating that provides a high-purity (>99% ) layer which is usable in vacuum and inert atmospheres to >2000 C (>3632 F).  This coating should NOT be used in air atmospheres.

Key Attributes
  • Very stable coating on Graphite substrates
  • Stops Graphite diffusion into parts or topcoatings
  • Applies like housepaint – brush, dip, or spray
  • Safe, Water-Based
Ideal Use
  • Coating Graphite crucibles, molds, and trays
  • Barrier coating to carbothermic reduction of oxide coatings in vacuum (typically extends use-temperatures of oxide topcoatings by 100-200 C)

Link to PDF datasheet: Traycoat-A-Aerosol-Brushable

Type G

Type G is a Gadolinium Oxide coating which uses very high purity (99.99%) Gd2O3 with a minimal amount of cellulosic binder to allow easy paintability and adherence with typical use-temperatures being near room temperature. However, the coating can be used also as a washcoat (low adherence) coating in the same fashion as our Type Y (Y2O3) coating, only in vacuum/inert atmospheres when
use-temperatures exceed 200 C (392 F). Type G is considered a “neutron absorber coating” and, as such, can be milled with Aluminium Oxide cylinders/balls to give smaller particles, if desired for such application.

Key Attributes
  • High thermodynamic stability
  • Applies like house paint – brush, dip, or spray
  • Gadolinium has the highest thermal neutron absorption cross section of any naturally occurring element
Ideal Use
  • Neutron capture
  • Nuclear applications
  • Barrier coating to interactions during heat treating

Link to PDF datasheet: Type G

Type E

Type E is a relatively-soft, washcoat-type of  Erbium Oxide (Y2O3) coating which provides a very-high-purity (99.99%) Er2O3 layer that is usable in vacuum and inert atmospheres to 2000 C (3632 F).  This coating can be used instead of Type Y (Y2O3) whenever Yttrium is not desired, yet the properties of Y2O3  are needed.  Type E should NOT be used in air atmospheres.

Key Attributes
  • Maintains Consistent Carbon Contents of Sintered Parts
  • Prevents Warping
  • Extends Tray Lifetime
  • Reaction-barrier Layer
  • Easy-to-Use, Fast-Drying, Solvent Based
Ideal Use
  • Graphite Trays/Boats for Cobalt-bonded WC, TiC, TaC Parts
  • Carbon Barrier/Separator Layer
  • Rare Earth Magnets
  • Reactive Refractory Metal Sintering

Link to PDF datasheet:Type E

Zypcoat HTO

Zypcoat® HTO is a water-based coating of Hafnium Oxide (HfO2) and Titanium Oxide (TiO2) blended in the molar ratio 2/3 HfO2 to 1/3 TiO2, which allows the formation of a special solid solution of Hf-Ti-O that has the very unique expansion (CTE, coefficient of thermal expansion) property of near zero expansion 1 .  The Zypcoat HTO (66.7HfO2 * 33.3TiO2 leads to a solid solution that is a stable solid to over 2000 C with no polymorphic transormation: the solid solution exhibits electrical resistivity of circa 7×106  Ω-cm 2.   Also, the Zypcoat HTO yields a well-bonded coating when applied to most highly-refractory substrates and is non-reactive with many ceramics and alloys, solid or molten.  After heating to 1300 C – 1600 C on an Alumina substrate, the coating is over 97% HfO2 – TiO2, with the remainder being Al2O3, which is most likely also in solid solution with the Hafnia/Titania.

1. S. R. Skaggs, “Zero and Low Coefficient of Thermal Expansion Polycrystalline Oxides, ” Report LA-6918-MS, Los Alamos Scientific Laboratory of the University of California, Los Alamos, New Mexico (1977).

2. C. E. Holcombe, M. K. Morrow, D. D. Smith, and D. A. Carpenter, “Survey of Low Expanding High Melting Mixed Oxides,” Report Y-1913, Union Carbide Oak Ridge Y-12 Plant, Oak Ridge, Tennessee (1974)

Key Attributes
  • Non-reactivity with many solid or molten metals/alloys
  • Use temperature estimated to be 2000 C in all atmospheres
  • On heat up to 1300 C – 1600 C, forms unique solid solution of HfO2 – TiO2
Ideal Use
  • Aerospace, nuclear, and demanding applications
  • Barrier coating to prevent diffusion, reactions, and sticking of parts during heat treatin
  • Very-high-temperature areas

Link to the PDF Datasheet: Zypcoat HTO