What wear-resistant powders are used in the coatings production ?
Usually there are four kinds wear-resistant powders used in coating ,they are corundum,silicon carbide,platelet aluminum oxide and composite wear-resistant filler,which are compatible with epoxy, polyurea, polyurethane, silicone, inorganic high-temperature paints, flooring, heavy-duty anti-corrosion and repair coatings.
I. Corundum
1. White corundum micropowder (WA)
White Corundum
α-Al₂O₃ ≥ 99%, Mohs hardness:9.0
Advantages: High whiteness, not turn black, low impurities, moderate price, beautiful paint film; moderate wear resistance and acid/alkali resistance.
Applications: Epoxy floor topcoat/intermediate coat, plastic wear-resistant paint, marine corrosion protection, repair agent, UV varnish
Disadvantages: Thermal conductivity is average; it is not as good as silicon carbide in long-term strong acid and alkaline environments.
2. Brown corundum micropowder BFA
Brown Corundum
Al2O3≈95%, brownish-red, with a slightly higher Fe2O3.
Advantages: Lowest price, strong wear-resistant frame
Applications: Heavy-duty floor substrates, mine chute primers, inexpensive industrial wear-resistant paints
Disadvantages: High iron content makes it prone to blackening, unsuitable for light-colored topcoats and high-gloss paints.
II. Silicon Carbide
1. Green silicon carbide micropowder GC
Green silicon carbide
With a Mohs hardness of 9.4~9.5, it boasts top-tier hardness in the industry, excellent resistance to strong acids and alkalis, and superior thermal conductivity.
Applications: Power battery heat dissipation coatings, lidar coatings, high-end heavy-duty anti-corrosion coatings, high-temperature flue paints, and integrated anti-slip and anti-corrosion coatings for ship decks.
Features: Ultrafine powder can be used to make high-gloss topcoats; however, the unit price is relatively high.
2. Black silicon carbide micropowder C
Applications: Abrasion-resistant coatings for mining, high-temperature heat-insulating coatings, intermediate coatings for heavy-duty flooring, friction-protective coatings
III. Platelet aluminum oxide
1. The micro-layered arrangement of the flakes seals the micropores in the paint film, significantly improving corrosion resistance.
2.Scratch resistance, improved paint film smoothness, increased paint film toughness, and reduced cracking.
Applications: Automotive topcoat, UV clear varnish, water-based anti-corrosion paint, electronic heat dissipation coating, pearlescent ink. Often used in combination with white fused alumina and silicon carbide to achieve both wear resistance and dense anti-corrosion coating.
IV. Filler Combination Schemes for Different Scenarios
1. Ordinary light-colored epoxy flooring (combining aesthetics and wear resistance): White corundum powder + a small amount of platelet aluminum oxide
2. Heavy-duty anti-corrosion for mines, sluices, and high-erosion applications: Black silicon carbide + brown corundum (cost reduction)
3. High-end corrosion-resistant, chemical acid and alkali equipment, and offshore platforms: Green silicon carbide + platelet aluminum oxide (dual guarantee of corrosion resistance and wear resistance)
4. Heat dissipation, thermal conductivity and wear-resistant coatings (new energy batteries, LEDs): Ultrafine green silicon carbide / platelet aluminum oxide
5. UV high-gloss transparent wear-resistant topcoat: ultra-fine platelet aluminum oxide + white corundum micropowder
6. High-temperature resistant inorganic/organic silicon coatings: green silicon carbide, white corundum, black silicon carbide