Near‑Spherical Single‑Crystal Alumina CAS 1344‑28‑1 is polyhedral near‑spherical alpha‑alumina formed by controlled high‑temperature crystal growth, classification and purification. It retains single‑crystal dense α‑Al₂O₃ lattice without complete melt spheroidization. Polyhedral particle morphology balances thermal conduction performance and slurry fluidity. It is used as thermally‑conductive filler for thermal grease and other TIM thermal interface materials to enhance thermal conductivity of e

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Near‑Spherical Single‑Crystal Alumina CAS 1344‑28‑1, Polyhedral α‑Al₂O₃ for Thermal Grease TIM & High‑Thermal Conductive

This near‑spherical single‑crystal alumina powder is manufactured via controlled high‑temperature crystal‑growth recrystallization, followed by crushing, washing, multi‑stage air classification and impurity removal. Unlike plasma‑melted fully spherical alumina, particles present regular polyhedral near‑spherical shapes with flat crystal facets. Each individual particle is dense single‑crystal α‑Al₂O₃ without internal melt‑derived closed pores. Oversized grains and sharp needle‑shaped fragments are eliminated during classification workflow.

The single‑crystal lattice structure provides excellent intrinsic thermal conductivity. Compared with irregular crushed angular alumina, the polyhedral near‑spherical profile reduces sharp‑edge abrasion on mixing equipment. Meanwhile, the crystal facets enable favorable inter‑particle contact points inside the polymer or oil matrix. These contact points form effective thermal conduction pathways, which is beneficial for improving bulk thermal conductivity of finished TIM composites. When contrasted with fully plasma‑spherical beads, this grade exhibits slightly higher slurry viscosity at identical loading, but offers competitive cost‑performance for thermal‑interface formulations.

For thermal grease applications, this polyhedral alumina is blended into silicone or hydrocarbon base oil. The polyhedral grains build interconnected thermal conduction networks within the grease system. It helps thermal grease to achieve higher thermal conductivity while maintaining acceptable spreadability for manual smearing or automatic dispensing. It can be combined with fine‑size spherical alumina fractions to create multi‑modal filler gradation, further boosting packing density and thermal performance.

For other TIM thermal‑interface materials including thermal pad and soft gap‑filler elastomer, this near‑spherical single‑crystal alumina can be incorporated into silicone rubber matrix. It improves heat dissipation capability of cured elastomer parts. Due to its polyhedral faceted morphology, this grade is not recommended for ultra‑low‑viscosity EMC molding compound or delicate CPO encapsulation, where fully high‑sphericity alumina is preferred to minimize viscosity and scratching risk.

Silane coupling agent surface treatment can be implemented on this polyhedral powder upon request. Surface modification enhances wetting between the faceted alumina particles and silicone or oil‑based binders, reducing interfacial thermal resistance and improving filler dispersion stability inside thermal grease and elastomer.

During compounding and dispersion processes, medium‑speed mixing is recommended. Excessive long‑duration high‑energy shearing will fracture the single‑crystal polyhedral particles, generating sharp fine debris. Fragmented fine grains will sharply increase slurry viscosity and aggravate abrasion of mixing equipment.

Formulation trials are essential to determine optimal filler loading. Increasing filler content raises thermal conductivity, yet over‑dosage will cause thermal grease to become dry and gritty, and make silicone‑based thermal pads lose elasticity. Multi‑modal particle‑size blending with finer alumina fractions is an effective way to balance thermal conductivity and processing rheology.

The powder shall be stored in hermetically sealed moisture‑proof containers within dry warehouse conditions. Humidity‑induced agglomeration will deteriorate dispersion in base oil and silicone, leading to inconsistent thermal conductivity across finished TIM batches. Strict physical segregation from fully‑spherical plasma‑alumina and severely angular crushed alumina must be maintained during storage and feeding to avoid undesired particle‑shape cross‑contamination. This near‑spherical single‑crystal polyhedral α‑alumina is a cost‑effective thermally‑conductive filler dedicated for thermal grease and high‑performance TIM thermal‑interface material formulations.

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.