TaC coated halfmoon parts for LPE

Product overview

Tantalum carbide (TaC) coated halfmoon parts are a key component designed for silicon carbide (SiC) epitaxial equipment, such as LPE equipment, to protect reaction chambers and improve process stability in high temperature, corrosive environments. Compared with traditional silicon carbide (SiC) coatings, tantalum carbide coatings have become the core upgrade solution for a new generation of semiconductor epitaxial equipment due to their excellent high temperature resistance, chemical inertness and thermal stability.

Application scenario and value

Tantalum carbide coated half moon parts are mainly used in the following key scenarios:

SiC epitaxial growth equipment: in LPE (liquid phase epitaxial), CVD (chemical vapor deposition) and other processes, as a protective component of the reaction chamber, to ensure high temperature uniformity and process consistency.

Third generation semiconductor manufacturing: suitable for the production of wide band gap semiconductor epitaxial layers such as silicon carbide (SiC) and gallium nitride (GaN), to meet the needs of high-quality epitaxial sheets for electric vehicles, 5G communications, and aerospace devices.

Comparison with traditional silicon carbide coating

Technology realization and process innovation

The tantalum carbide coating is prepared by the first chemical vapor deposition (CVD) or physical vapor deposition (PVD) process, ensuring a dense coating without defects and a uniform and controllable thickness (typically 50μm). For the special needs of semiconductor equipment, gradient doping technology can also be used to optimize the adhesion between coating and substrate, and further improve the thermal fatigue resistance.

Core advantages of tantalum carbide coating

Excellent stability at extreme temperatures:

Tantalum carbide (TaC) has a melting point of up to 3880°C (much higher than silicon carbide's 2700°C) and maintains structural integrity at temperatures above 1800°C. This characteristic makes it excellent in ultra-high temperature processes for SiC epitaxial growth (such as MOCVD, LPE), avoiding coating failure due to thermal stress or phase transition.

Excellent chemical inertness:

In the process of SiC epitaxy, there are often active gases containing silicon (Si), hydrogen (H₂) and halogen (Cl) in the reaction chamber. The corrosion resistance of the tantalum carbide coating to such gases is significantly better than that of silicon carbide, which can effectively reduce the side reaction between the coating and the reaction gas, thereby reducing the risk of particle pollution and improving the quality of the epitaxial layer.

Low thermal expansion coefficient matching:

The thermal expansion coefficient of tantalum carbide (~6.3×10⁻⁶/K) is close to that of graphite substrate (~4.2×10⁻⁶/K), which can reduce the interface stress caused by thermal cycling, avoid cracking or peeling of the coating, and extend the service life of the component.

Reduce maintenance costs and increase productivity:

Traditional SIC coatings are easy to oxidize or react with process gases at high temperatures, requiring frequent downtime for maintenance. The durability of the tantalum carbide coating can significantly extend the maintenance cycle, reduce equipment downtime, and reduce the overall cost by more than 30%.