Wet-Molded Felt

Semicorex Wet-Molded Felt is created by dispersing carbon fibers in a liquid medium and shaping them into a desired form through a controlled molding process. Once formed, the material is dried and heat-treated to achieve a stable carbon structure. This process results in a cohesive, monolithic felt with consistent density distribution and minimal structural discontinuities.

Compared to other carbon insulation materials, wet-molded felt typically has a lower density, which contributes to its superior thermal insulation properties. The porous structure effectively traps air and reduces heat transfer, making it highly efficient in minimizing energy loss in high-temperature systems.

Role in Thermal Field Design

Within a semiconductor furnace, wet-molded carbon felt is typically used as a primary insulation component surrounding the heating zone. Its function includes:

Minimizing radial and axial heat loss from the hot zone

Stabilizing temperature distribution across the thermal field

Reducing power consumption by improving heat retention

Protecting external furnace components from excessive heat exposure

The monolithic structure of wet-molded felt allows it to form continuous insulation layers without gaps, which is essential for maintaining a controlled and uniform thermal environment.

Material Behavior in High-Temperature Environments

Wet-molded carbon felt performs exceptionally well under the high-temperature, low-oxygen or vacuum conditions typical of semiconductor furnaces. Its low density creates a highly porous structure that effectively traps heat, reducing thermal conductivity and enhancing insulation performance.

This makes it particularly suitable for processes such as:

Silicon single-crystal growth (CZ or directional solidification)

SiC crystal growth furnaces

High-temperature annealing and diffusion systems

CVD and epitaxial growth equipment

In these environments, maintaining stable thermal gradients is crucial, and wet-molded felt plays a central role in achieving that stability.

Comparison with Laminated Felt

There are two primary types of carbon felt used in high-temperature applications: laminated felt and wet-molded felt. Each has distinct advantages depending on operational requirements.

Wet-molded felt excels in insulation performance due to its lower density and more open structure, which enhances its ability to retain heat. However, this same characteristic results in relatively lower mechanical strength and durability compared to laminated felt.

Laminated felt, on the other hand, is produced by layering and compressing carbon fiber sheets, resulting in a denser and stronger material. This gives it higher mechanical strength and better resistance to wear and deformation, but at the cost of reduced insulation efficiency.

In practical terms, wet-molded felt is ideal for applications prioritizing thermal insulation, while laminated felt is better suited for environments requiring higher structural strength.

Design and Integration

The flexibility of the wet-molding process allows this material to be manufactured in a variety of shapes and sizes, including cylindrical, ring-shaped, or custom-designed components as shown in the image. This adaptability ensures easy integration into complex thermal systems, improving overall system efficiency and performance.

Despite its lower mechanical strength compared to laminated felt, wet-molded felt can be effectively used in non-load-bearing insulation roles, where its thermal advantages outweigh structural considerations.

Quality Assurance and Expertise

Semicorex applies strict quality control measures to ensure that each piece of wet-molded felt meets high standards for consistency, purity, and performance. With extensive experience in carbon material engineering, Semicorex provides reliable insulation solutions tailored to the specific needs of global customers.

Semicorex Wet-Molded Felt is a high-efficiency carbon insulation material designed for applications where thermal performance is critical. Its lightweight structure, excellent insulation capability, and adaptability make it a valuable choice for high-temperature systems. While it offers lower mechanical strength compared to laminated felt, its superior heat retention properties make it an ideal solution for energy-efficient and precision-controlled thermal environments.