Alumina-silica board

# Alumina-Silica Boards: The “Unseen Pillar” of the Electronics Industry

In the precision manufacturing of semiconductor chips, in the enhancement of luminous efficacy in LED lighting, and in the safety protection of batteries for new-energy vehicles, a material known as “alumina-silicon composite board” is serving as an “invisible pillar,” underpinning the advancement of the modern electronics industry. This functional composite panel, made by combining alumina (Al₂O₃) with silicon-based materials, boasts high electrical insulation, high thermal conductivity, superior high-temperature resistance, and excellent chemical stability, making it an indispensable core component in high-end electronic equipment.

## From Wafer Thinning to Integrated Circuit Substrates: The “Hardcore” Applications of Alumina-Silicon Boards

In the semiconductor manufacturing industry, alumina–silica wafers are used across multiple critical stages, from wafer processing to chip packaging. Taking a 12-inch wafer as an example, its fabrication involves more than ten process steps, including single-crystal pulling, slicing, grinding, and chemical mechanical polishing (CMP). Among these, the CMP step imposes extremely stringent requirements on surface flatness: for wafers at the 10-nm technology node, surface defect sizes must be kept below 10 nm, and the number of micro-defects on each wafer that are equal to or larger than the feature size must not exceed 10. Under such extreme specifications, high-purity, flat-shaped alumina polishing abrasives have become the core material for wafer thinning. Domestic companies, through technological innovation, have developed alumina polishing abrasives whose performance surpasses that of international giants such as Japan’s FUJIMI and the U.S.’s Microgrit. This not only achieves domestic substitution but also reduces costs by 50%, significantly improving yield in semiconductor manufacturing.

In the field of integrated circuit substrates, alumina–silicon boards serve as “circuit carriers.” Their high dielectric insulation (with a dielectric constant as high as 9.8) effectively suppresses signal interference, while their high thermal conductivity (25–30 W/m·K) rapidly dissipates the heat generated during chip operation, thereby ensuring stable circuit performance. For instance, in 5G communication base stations, alumina substrates shoulder the critical task of high-frequency, high-speed signal transmission; their low-loss characteristics enhance signal transmission efficiency by 30%, making them one of the key materials that underpin the deployment of 5G technology.

## LED Packaging and New Energy: The “Green” Empowerment of Alumina-Silicon Substrates

In LED lighting and display technologies, alumina–silicon substrates are driving the industry toward greater efficiency and environmental sustainability by optimizing light output and thermal management. Conventional LED packaging materials, with their insufficient thermal conductivity, tend to elevate chip temperatures, thereby reducing luminous efficacy and shortening device lifespan. In contrast, alumina–silicon substrates, with their high thermal conductivity and high refractive index of 1.76, can not only lower chip temperatures by 20% but also boost luminous efficacy by more than 15% through optimized optical path design. In high-end applications such as smart lighting and automotive lighting, alumina-based packaging materials have gradually replaced traditional materials, emerging as a key enabler of LED industry upgrading.

In the field of new-energy vehicles, the application of alumina–silica boards centers on enhancing battery safety and extending driving range. As a coating material for battery separators, these boards form a dense ceramic layer that effectively prevents internal short circuits; their exceptional thermal stability—withstanding temperatures up to 1,200°C—helps avert thermal runaway, thereby significantly improving overall battery safety. Moreover, the alumina coating reduces side reactions during charging and discharging, extending the battery’s cycle life by more than 30% and providing critical material support for the widespread adoption of new-energy vehicles.

## Technological Breakthroughs and Market Dynamics: The “Comeback” Path of Domestication

Alumina–silica boards are characterized by extremely high technological barriers; their production requires simultaneous control of the crystalline phase structure of alumina (such as the stability of α-Al₂O₃), the purity of silicon-based materials (which must exceed 99.99%), and the precision of the composite manufacturing process. For a long time, this field has been dominated by international firms such as Sumitomo of Japan and Heraeus of Germany, leaving domestic companies in a “chokepoint” situation. However, with increasing domestic R&D investment, this landscape is now changing. For example, Zibo Zhonglida New Materials has successfully developed alumina grinding abrasives with a uniform particle-size distribution (D50 = 1.5 μm) and a hardness of HV 2000 by innovating seed-crystal decomposition technology. These performance metrics surpass those of comparable international products and have been widely adopted by semiconductor companies such as SMIC and Yangtze Memory Technologies.

At the market level, global demand for alumina-silica boards is growing at an annual rate of 8%, with the semiconductor and new-energy sectors accounting for more than 60% of that demand. Domestic companies, leveraging their cost advantages and technological breakthroughs, have established a strong foothold in the global market. According to statistics, China’s exports of alumina-silica boards reached 400,000 tonnes in 2025, up 25% year on year, primarily to Southeast Asia, Europe, and other regions, thereby becoming an indispensable link in the global supply chain.

## Future Outlook: A Leap from “Invisibility” to “Leadership”

With the rise of emerging technologies such as 5G, artificial intelligence, and quantum computing, the application scenarios for alumina-silica boards are continually expanding. In the field of flexible electronics, researchers are exploring the integration of alumina-silica boards with polymer substrates to develop bendable and foldable electronic devices; in quantum computing, the low-temperature superconducting properties of alumina make it a promising candidate for use as a qubit carrier material; and in bioelectronics, alumina’s biocompatibility renders it an ideal interfacial material for connecting biological tissues with electronic devices.

From wafer thinning to quantum computing, and from LED lighting to new-energy vehicles, alumina-silicon boards are serving as an “invisible pillar,” underpinning the electronics industry’s drive toward higher precision, greater efficiency, and enhanced sustainability. Looking ahead, as domestic production deepens and technological breakthroughs continue, this material is poised to move from behind the scenes to center stage, emerging as a core enabler of global electronics-industry upgrading.