At Haydale we have combined our deep scientific knowledge and technological innovation with engineering know-how to create products that will deliver unprecedented performance.
Innovation underpins everything we do.
We have a growing portfolio of advanced materials technology (MATech™), including graphene PLA, ceramic matrix composites and metal matrix composites for use with additive manufacturing. These materials are helping to enable the Fourth Industrial Revolution. We are positioning ourselves to play a major role in helping to usher in this exciting and promising new era of manufacturing.
SI-TUFF™ performance ceramic additive was developed from silicon carbide microfiber technology used in high performance ceramic parts and cutting tools. With properties similar to diamond, it is designed to reinforce and protect polymeric coatings from repeated wear and high temperatures.
It improves scratch and abrasion resistance, toughness, thermal conductivity, and thermal stability. Because it is used at low loading levels, it preserves other desirable coating properties, such as non-stick. SI-TUFF™ is extremely robust and can be used in practically any environment, and it is food contact safe.
SI-TUFF™ is long, rigid rods of beta-silicon carbide (β-SiC) single crystals. The cubic crystal structure of the beta polytype is the same as diamond. This gives it some unique properties including extremely high hardness and modulus, and excellent force distribution. At its supplied length, SI-TUFF™ is unbreakable.
β-SiC is inert and temperature stable up to 600°C when it begins to slowly oxidize. This oxide layer limits the rate of the reaction and significant oxidation does not occur until around 1000°C.
Reinforced Coatings: How does it work?
SI-TUFF™ works by forming a connected, reinforcing network just below the surface of the coating. Because of the extreme strength and high aspect ratio of the individual nano-rods, loads are transferred effectively throughout the network. Scratch, abrasion, and impact forces are distributed into multiple, smaller force components. This minimizes local forces and reduces damage.
The same principle also increases thermal conductivity and thermal stability. Because of the highly connected nature of the SI-TUFF™ network, heat is conducted with far less resistance through the reinforced coating. Additionally, SI-TUFF™ has a high emissivity, meaning heat is released faster by radiation.
Because the SI-TUFF™ network sits just below the coating surface, it does not affect inherent surface properties such as non-stick or low friction. Thus, the end result is that the coating retains all of its desirable properties which have already been engineered, but is able to withstand increased wear at higher temperatures for longer periods of time.
Functionalization: Chemical Reinforcement
Haydale Technologies has developed proprietary functionalization technology to covalently graft functional groups directly onto the surface of individual silicon carbide single crystals that make up SI-TUFF™. Currently, amine and epoxy functionality is available.
Functionalized SI-TUFF™ acts as an external crosslinker, enabling the functionalized materials to covalently bond directly into compatible polymers, forming an extremely strong reinforcing network in the matrix.
Functionalized SI-TUFF™ may offer performance benefits in compatible systems, including:
- Increased abrasion and scratch resistance, impact resistance, hardness, and toughness compared to what is possible with non-functionalized SI-TUFF™ SF-1.
- Improved dispersion quality and ease of mixing, compatibilizing.