GB/T 39950-2021 in English
VALIDAlumina ceramic heat radiating element for LED lamp
- Issued on:2021-04-30
- Implemented on:2021-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
《GB/T 39950-2021LED灯用氧化铝陶瓷散热元件》由TC194（全国工业陶瓷标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
Analysis of Standard Technical Framework
| Core Parameters | 92% Alumina | 96% Alumina | 99% Alumina |
|---|---|---|---|
| Volume Density(g/cm³) | ≥3.60 | ≥3.70 | ≥3.80 |
| Thermal Conductivity[W/(m·K)] | ≥14 | ≥18 | ≥22 |
| Breakdown Strength(kV/mm) | ≥15 | ≥15 | ≥15 |
Structural classification and labeling system
The standard defines 6 types of structures: flat structure (a), corrugated structure (b), bump structure (c), needle structure (d), grid structure (e), cup structure (f). Labeling example AOa96 means: flat structure heat dissipation element with 96% alumina content.
Key performance test methods
- Thermal conductivity test: measured by the flash method according to GB/T22588
- Volume resistivity: tested at room temperature (RT) according to GB/T5594.5
- Appearance defect judgment: cracks are not allowed in area A, and pits ≤0.5mm are allowed in area B
Key points of quality control
The production case of 96% alumina heat sink of a certain enterprise shows that by strictly controlling the sintering temperature curve, the thermal conductivity can be increased from the standard requirement of 18W/(m·K) to 21W/(m·K), while maintaining the bending strength ≥300MPa.
Implementation Suggestions
- When purchasing raw materials, suppliers should be required to provide third-party test reports on the content of aluminum oxide.
- For high-power LED applications, needle-shaped/grid-shaped structures with 99% aluminum oxide are preferred.
- Regularly calibrate the work surface roughness with a GB/T6062 contact profilometer
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