High Temperature Alloy Seal Ring

The High Temperature Alloy Seal Ring is engineered for turbine interstage sealing in aircraft engines. It achieves sealing purely through its own elasticity—no springs or bellows required. Precision-rolled superalloy wire (GH4169 or GH4738) is formed into an open ring, heat-treated, and cut to create a 0.3–0.8 mm radial preload when installed. The result is a simple yet advanced self-energizing fit.

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Product Introduction

Technical Parameters

Parameter	Value
Product Name	High Temperature Alloy Seal Ring
Applicable Bore Diameter	50 – 300 mm
Ring Cross Section	Rectangular (width 2–6 mm, height 1.5–4 mm)
Operating Pressure Difference	≤ 8.0 MPa
Operating Temperature	450°C – 850°C (peak 900°C)
Linear Speed	≤ 80 m/s
Material	GH4169 (Inconel 718), GH4738 (Waspaloy), GH625
Surface Treatment	Aluminized + plasma spray Y₂O₃-stabilized ZrO₂ (0.05–0.10 mm thick)

Key Advantages

1. Self-Energizing, Spring-Free Design

The High Temperature Alloy Seal Ring is engineered for turbine interstage sealing in aircraft engines. It achieves sealing purely through its own elasticity-no springs or bellows required. Precision-rolled superalloy wire (GH4169 or GH4738) is formed into an open ring, heat-treated, and cut to create a 0.3–0.8 mm radial preload when installed. The result is a simple yet advanced self-energizing fit.

2. Pressure-Activated Tightening

The ring features a 45° lap joint design. During operation, media pressure enters the groove behind the ring, pushing it harder against the bore wall. The higher the pressure, the tighter the seal. At high temperatures, the ring expands, closing the gap from 0.1–0.2 mm at room temperature to 0.02–0.05 mm. This creates a nearly gapless metal-to-bore seal, maximizing efficiency and preventing leakage.

3. High-Temperature Oxidation Resistance

An aluminum diffusion coating, followed by plasma-sprayed yttria-stabilized zirconia, enhances oxidation and corrosion resistance. The ring withstands continuous operation at 850°C and peak temperatures up to 900°C, ensuring reliable performance under extreme thermal conditions.