In the workshop of a ceramic materials enterprise within a major Chinese semiconductor manufacturing cluster, technical engineers are conducting final inspections on a batch of freshly produced alumina ceramic rings. These mirror-smooth ceramic rings are destined for a leading domestic chip fabrication plant, where they will be installed in etching equipment worth tens of millions of dollars.
"Five years ago, such high-end semiconductor ceramic components were almost entirely imported. Now, our products have entered the supply chains of leading companies like SMIC and YMTC," revealed the company's technical director. These seemingly ordinary ceramic rings can operate stably under extreme corrosive gas and high-temperature environments, serving as indispensable key consumables in the chip manufacturing process.
The booming development of the semiconductor industry has placed unprecedented demands on material performance throughout the manufacturing process. Precision ceramics, with their unique properties, have become indispensable key materials for chip manufacturing.
Within the core equipment of chip fabrication, precision ceramic components play irreplaceable roles. Electrostatic chucks and gas distribution plates inside etching machines must remain stable in high-frequency plasma environments; ceramic retaining rings for chemical mechanical polishing (CMP) equipment must maintain dimensional accuracy under high-pressure friction conditions.
Ceramic materials such as alumina, aluminum nitride, and silicon carbide have become the preferred choice for semiconductor equipment manufacturers due to their excellent corrosion resistance, high hardness, and good insulation properties. Components made from these materials maintain stable performance under extreme process conditions, directly impacting chip manufacturing yield and efficiency.
Notably, as chip processes continue to shrink, the requirements for precision and cleanliness of ceramic parts are also rising. Surface roughness requirements have escalated from the micron-level to the nano-level, where any microscopic particle could lead to the scrapping of chips worth thousands of dollars.
In the front-end semiconductor manufacturing processes, precision ceramics are primarily applied in three key segments: thin-film deposition, etching, and polishing. Each segment places different emphasis on the performance requirements of ceramic materials.
Heaters and susceptors in thin-film deposition equipment need to withstand temperatures above 600°C while maintaining excellent thermal uniformity. High-purity aluminum nitride ceramics are the material of choice for such applications due to their superior thermal conductivity and insulation.
In the plasma etching segment, yttria ceramics are widely used for etching chamber liners and focus rings due to their extremely low metal ion content and excellent plasma erosion resistance. Statistics show that ceramic components can account for over 30% of an advanced etching machine. As semiconductor integration increases, etching processes are conducted in increasingly harsh environments, accelerating the wear of traditional ceramic parts. Research is pushing boundaries, with institutions like the Korea Institute of Materials Science developing novel transparent high-entropy ceramics that demonstrate etch rates as low as 8.25% compared to yttria, significantly enhancing component durability.
Ceramic retaining rings in CMP equipment need to operate long-term in strong acid/alkaline slurry environments while maintaining dimensional stability. Zirconia-toughened alumina ceramics dominate this field with their high toughness and wear resistance.
With the evolution of semiconductor technology, the role of precision ceramics has expanded from purely structural support to active participation in the process as functional elements.
The electrostatic chuck is a typical example of this transformation. This chuck, made using ceramic dielectric materials, firmly holds silicon wafers by applying electrostatic force while allowing precise temperature control via helium gas. A 300mm diameter electrostatic chuck requires flatness of no more than 5 micrometers, representing an extremely high technical hurdle.
In the field of advanced packaging, ceramic substrates are playing an increasingly important role. Aluminum nitride ceramic substrates, with their high thermal conductivity and thermal expansion coefficient matching that of silicon, are an ideal choice for high-power chip packaging. Compared to traditional organic substrates, ceramic substrates can reduce chip operating temperatures by 15-20°C, significantly improving device reliability.
Particularly noteworthy is that silicon carbide ceramic, as a third-generation semiconductor material itself, is also gaining prominence in the power device arena. Compared to traditional silicon-based power devices, silicon carbide devices can reduce energy loss by 70% while shrinking system volume by more than 50%.
The global semiconductor ceramics market is experiencing rapid growth. According to data from industry analysis firm QYResearch, the global semiconductor precision ceramics market was valued at approximately $2.87 billion in 2024, and is projected to grow to $4.22 billion by 2031, with a compound annual growth rate (CAGR) of 5.7%.
In this market, Japanese companies dominate, with Kyocera, NGK Insulators, and others controlling about 70% of the global high-end semiconductor ceramics market share due to first-mover advantages and technological accumulation. Particularly in high-end components like electrostatic chucks, Japanese firms hold over 90% market share.
Although China's semiconductor ceramics industry started later, it is developing rapidly. With the expansion of domestic chip manufacturing capacity, demand for semiconductor ceramic components continues to grow. In the alumina ceramic components segment, Chinese companies have increased their market share to around 30%, gradually achieving domestic substitution for mid-to-low-end products.
However, in high-end ceramic material fields like aluminum nitride and yttria, Chinese firms still have significant room for improvement in terms of technological level and market share. Especially for ceramic components required in 12-inch wafer manufacturing equipment, the domestic production rate remains below 20%.
As SMIC announces a $7.5 billion investment to build a new 12-inch wafer fab in Shanghai, China's semiconductor industry is ushering in a new round of capacity expansion. In the cleanroom of YMTC, technicians carefully replace ceramic parts in etching machines. These seemingly inconspicuous components carry the hope for China's chip self-reliance.
From 8-inch to 12-inch, from mature to advanced processes, precision ceramics are upgrading in sync with the semiconductor industry. In this intricate dance of chip manufacturing, ceramic materials are no longer silent supporting actors but key partners evolving alongside the technology. When the final ceramic part is installed in the last piece of equipment, the overture to chip manufacturing begins, and the dance of precision ceramics has just started.
