Aerospace parts primarily use titanium alloys, aerospace aluminum, nickel-based high-temperature alloys, and ultra-high-strength stainless steel as their base materials. Mandatory standards exist for iron-free contamination, chemical inertness, controllable roughness, and precise descaling. White fused alumina is one of the few abrasives that simultaneously meets the aerospace standard AMS 2431/9, with five core advantages:
1. Ultra-high purity, eliminating iron contamination (a primary requirement for aerospace). White fused alumina is made from electrofused high-purity alumina powder, with Al₂O₃ ≥ 99% and Fe₂O₃ < 0.05%, virtually free of iron, titanium, and silicon impurities.
Aerospace process requirements: After sandblasting, anodizing, thermal spraying, and vacuum brazing are necessary. Trace amounts of residual iron can cause coating peeling and weld porosity. White fused alumina leaves no residue, requiring no additional acid pickling to remove iron, meeting aerospace cleanliness standards.
Extremely chemically inert: Resistant to high and low temperatures, acids, alkalis, and salt spray; it does not react with titanium alloys or high-temperature alloys, and will not cause yellowing or oxide spots on parts.
II. Mohs 9 High Hardness + Self-Sharpening, Suitable for Difficult-to-Machine Alloys in Aerospace Applications
Hardness Matching: Mohs 9, higher than titanium alloys, nickel-based alloys, and stainless steel, can quickly remove high-temperature oxide scale, machining marks, burrs, and carbon deposits; glass beads have a hardness of only 6-7, only achieving a light matte finish and cannot remove dense hot oxide layers;
Self-Sharpening Characteristics: After impact, particles shatter along grain boundaries, continuously generating new sharp edges. The cutting force does not decrease over long-term sandblasting, and the cleaning efficiency is more than 30% higher than brown corundum, suitable for descaling engine blades and hot-end components in combustion chambers;
Full Grit Coverage: #60 coarse abrasive powerfully removes old coatings/thick oxide scale, #180~#320 fine abrasive provides a precise matte base coat, with controllable roughness Ra, perfectly matching the anchor patterns required for thermal spraying.
III. No silica infiltration into the substrate, no risk of silicosis, and compliant with aviation safety regulations.
Free of free silica (unlike quartz sand), sandblasting dust poses no risk of silicosis, meeting the environmental and occupational safety requirements of aviation workshops;
Compared to ceramic sand/zirconia sand: Ceramic sand is spherical, suitable for shot peening and lightweight matte finish, but has weak cutting force and extremely low efficiency in cleaning thick oxide scale; white fused alumina has multiple edges, combining cleaning and roughening for higher production efficiency;
Does not embed in soft aviation aluminum: Under reasonable pressure, no hard particles are embedded, avoiding material detachment during flight that could cause oil circuit blockage and dynamic balance failure.
IV. **Dimensionally Accurate and Resilient for Thin-Walled/Precision Parts:** Aerospace applications often involve thin-walled blades, casings, and precision seals, requiring precise cutting and avoiding deformation. Controllable cutting force, achieved through precise control of particle size and air pressure, removes only surface defects without damaging the substrate. The resulting surface texture is uniform and smooth, eliminating sharp machining marks, dispersing alternating stress, and indirectly improving part fatigue life (a core requirement for aero-engines).
V. **Recyclable and Compatible with Aerospace-Grade Closed Sandblasting Booths for Mass Production:** White fused alumina has moderate toughness and a stable crushing rate. Closed-loop sandblasting systems can be recycled 150-200 times, with losses far lower than glass beads (which are easily crushed and discarded after a single use). Aerospace maintenance and mass machining often utilize automatic closed-loop sandblasting booths, ensuring controllable long-term overall costs and easy dust filtration, guaranteeing a clean production environment.
white fused alumina F60#:
