Why can green carborundum GC be used as a wear-resistant additive for the production of non-stick pan coatings?
Green carborundum GC can be used as a wear-resistant additive for the production of non-stick pan coatings, mainly due to its unique physical and chemical properties, which make it play a key role in high-temperature, high-friction cooking environments. The following are the main features of green carborundum GC:
I. Chemical composition and safety
High purity: The content of green carborundum GC (SiC) is ≥98%, which ensures its high hardness and chemical stability.
Extremely low heavy metal residue: The content of heavy metals such as hexavalent chromium must be <0.01 ppm (0.01 mg/kg) to ensure the safety of the coating in contact with food.
Impurity control: Free carbon (F.C) ≤0.2%, iron oxide (Fe₂O₃) ≤0.40%, to avoid affecting the performance of the coating.
II. Physical properties
Hardness and wear resistance: The Mohs hardness of green carborundum GC must reach 9.4 to ensure that the coating wear resistance test is >5000 times (such as cooking test).
Particle size uniformity: Normal used sizes are #600 (D50: 20 microns), #800 (D50:14 microns), #1000 (D50:11.5 microns), and #1200 (D50: 9.5 microns), ensuring that the particles are concentrated and evenly dispersed in the coating.
III. Stability and durability
High temperature resistance: Green carborundum GC can withstand high temperatures of 1900℃ (melting point 2250℃) and adapt to cooking environments.
Chemical inertness: Green carborundum GC is resistant to acid and alkali corrosion and oxidation, preventing the coating from being corroded by salt or seasoning.
Thermal shock resistance: The physical properties of green carborundum GC are stable at high temperatures, avoiding cracking or peeling of the coating.
IV. Production process requirements
Surface treatment: Green carborundum GC must be treated with acid and water washing to remove surface impurities and improve purity and chemical stability.
Environmental protection: The production of green carborundum GC must meet sustainable standards (such as recycling waste powder) to reduce environmental pollution.
Ⅴ. Functional effects
As a wear-resistant filler, greencarborundum GC can improve the coating’s hardness and scratch resistance, scrub resistance and hiding power (using the spherical structure of particles to scatter light); high temperature strength and anti-aging performance.
In summary, green carborundum GC that meets the standards must have food-grade safety, excellent wear resistance, high temperature stability and controllable particle size distribution to meet the durability and safety requirements of non-stick pan coatings.