China C/C Composite Manufacturer, Supplier, Factory

In modern chip manufacturing, the substrate provides physical support and a heat dissipation path, while the epitaxial layer determines the electrical performance limits of the device. This article provides an in-depth analysis of the fundamental differences between single-crystal silicon and silicon carbide substrates and CVD/MBE epitaxial processes, and reveals how epitaxial technology enhances the performance of high-frequency and high-voltage devices by reducing defect density and incorporating strain engineering. Whether you are a process engineer or a procurement decision-maker, this guide will help you quickly identify the most suitable wafer selection strategy.

As the 8-inch silicon carbide (SiC) process matures, manufacturers are accelerating the shift from 6-inch to 8-inch. Recently, ON Semiconductor and Resonac announced updates on 8-inch SiC production.

The article analyzes the specific challenges faced by the CVD TaC coating process for SiC single crystal growth during semiconductor processing, such as material source and purity control, process parameter optimization, coating adhesion, equipment maintenance and process stability, environmental protection and cost control, as well as the corresponding industry solutions.

CVD TAC coating is a process for forming a dense and durable coating on a substrate (graphite). This method involves depositing TaC onto the substrate surface at high temperatures, resulting in a tantalum carbide (TaC) coating with excellent thermal stability and chemical resistance.

In the process of growing silicon carbide (SiC) crystals via the Physical Vapor Transport (PVT) method, the extreme high temperature of 2000–2500 °C is a “double-edged sword” — while it drives the sublimation and transport of source materials, it also dramatically intensifies impurity release from all materials within the thermal field system, especially trace metallic elements contained in conventional graphite hot-zone components. Once these impurities enter the growth interface, they will directly damage the core quality of the crystal. This is the fundamental reason why tantalum carbide (TaC) coatings have become a “mandatory option” rather than an “optional choice” for PVT crystal growth.

On September 5, 2025, a customer from Poland visited a factory under VETEK to learn about our advanced technologies and innovative processes in the production of carbon fiber products.