GB/T 39863-2021 in English
VALIDAlumina ceramic substrate for copper clad laminate
- Issued on:2021-03-09
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 39863-2021覆铜板用氧化铝陶瓷基片》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 core requirements of the standard
| Performance indicators | Technical requirements | Test standards |
|---|---|---|
| Alumina content | ≥96% | GB/T6900 |
| Thermal conductivity (RT) | ≥24W/(m·K) | GB/T22588 |
| Dielectric loss tangent (1MHz) | ≤3×10-4 | GB/T5594.4 |
Detailed explanation of key technical indicators
The thermal expansion coefficient of alumina ceramic substrates is required to be controlled within (7.5~8.0)×10-6/K(RT~800℃), which directly affects the thermal matching of copper clad laminates. The standard stipulates that the rod method (GB/T16535) is used for testing to ensure the thermal expansion consistency with the metal layer.
Key points for the implementation of the test method
The bending strength test requires that the sample size is strictly controlled within (40±0.2)mm×(10±0.2)mm, and the span is 30±0.1mm. In actual application, a company failed to control the burrs on the edge of the sample, resulting in a test value deviation of 15%. After polishing, the data returned to the normal range.
Standard Evolution Analysis
Compared with the early industry specifications, this standard adds flash method for thermal conductivity (GB/T22588) and thermal shock resistance test (10 cycles) requirements, reflecting the need for high-power electronic devices to improve substrate reliability. The 2021 version increases the volume resistivity index from 1013Ω·cm to 1014Ω·cm to meet the insulation requirements of 5G equipment.
Quality control recommendations
- Raw material control: Select raw materials with α-Al2O3 purity ≥99.5%
- Sintering process: It is recommended to use 1700-1750℃ atmosphere sintering
- Factory inspection: Each batch must be inspected for working surface roughness (≤0.7μm) and warpage (≤0.2%)
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