Wind power hubs are heavy‑duty ductile iron castings with a single weight of 29 tons and a maximum wall thickness of 120 mm. The long pouring cycle imposes strict requirements on the high‑temperature stability and coating forming performance of foundry coatings. The traditional brushing process suffers from low production efficiency and brush‑mark defects on the coating. Heavy post‑cleaning work restricts the mass‑delivery capacity of wind‑power castings for foundries.

XINDA AT600SP zircon‑flour coating is applied with an airless spraying method under furan resin sand conditions. The spraying process improves coating efficiency, delivers a protective coating with uniform thickness and smooth surface, and optimizes the surface quality of wind power hub castings.

Ⅰ、Product, Casting and Production Process Parameters

Technical Specifications of AT600SP：

Casting Information：

Production Process & Application Details：

Ⅱ、Core Advantages of AT600SP Zircon‑Flour Coating

1. Excellent suspension performance for stable storage and on‑site application

   The 2‑hour suspension rate reaches ≥98% and the 24‑hour suspension rate ≥95%. The coating avoids delamination and sedimentation during storage and maintains stable slurry properties for continuous spraying operation.

2. Low gas evolution to minimize porosity risks

   The gas evolution value is less than 18 ml/g. Controlled gas release during long‑term high‑temperature pouring for heavy‑section wind‑power castings effectively reduces casting porosity defects.

3. Outstanding abrasion resistance for reliable high‑temperature protection

   With an abrasion resistance value of 0.4, the high‑strength coating resists erosion by high‑temperature molten iron and forms an effective barrier between liquid metal and sand mould.

4. Compatible with airless spraying for greatly improved productivity

   The paste‑form coating can be directly used for airless spraying after dilution to the working Baume degree. Spraying efficiency doubles compared with manual brushing, suitable for mass production of large 1000T‑1500T wind‑power castings.

Ⅲ、On‑site Application and Result Analysis

Airless spraying was adopted with two spraying passes. The coating thickness was controlled at 0.6‑0.8 mm and cured by flame drying.

• Premium coating appearance: The finished coating is smooth and flat without brush marks or cracks, with well‑controlled uniform thickness.

• Remarkable efficiency improvement: Spraying productivity is doubled versus traditional brushing. One operator can complete coating work for large 1000‑1500‑ton wind‑power castings.

• Complete coating stripping after pouring: The coating peels off integrally after cooling, delivering smooth casting surfaces.

• Elimination of burn‑on defects: The casting is free from metal penetration, which drastically reduces grinding and cleaning workload and cuts post‑processing time and costs.

Xinda AT600SP zircon‑flour coating is specially developed for heavy‑wall ductile iron wind‑power castings. Optimized for automatic airless spraying, it balances high‑efficiency construction and superior anti‑burn‑on performance. It is widely used for mass‑produced heavy wind‑power castings including hubs, bed frames and gearbox housings.