Ceramic metal seals represent a sophisticated sealing technology that integrates ceramic and metal materials. By capitalizing on the high hardness, high-temperature resistance, and corrosion resistance of ceramics, as well as the toughness and processability of metals, these seals are extensively utilized across industries such as aerospace, electronics, and chemicals. Through specialized processes like sintering and brazing, a robust bond is created between ceramic and metal at the interface. This effectively prevents the leakage of gases or liquids, ensuring reliable sealing performance and stability even in demanding environments.

Ceramic Metal Seals

Features of Ceramic Metal Seals

Superior High-Temperature Resistance: the ceramic material itself has a very high melting point, usually above 1500℃, even up to 2000℃, while the metal part can also withstand high temperatures. This combination ensures that ceramic metal seals maintain their sealing integrity in high-temperature settings, such as aerospace engines and industrial furnaces.

Strong Corrosion Resistance: Ceramics are highly resistant to acids, alkalis, salts, and other corrosive substances. The metal parts can be further enhanced with appropriate materials or coatings. This makes ceramic metal seals highly effective in resisting chemical erosion in industries like chemicals and electronics.

High Strength and Hardness: The hardness and wear resistance of ceramics, coupled with the toughness of metals, result in seals that remain stable and durable under high-pressure and abrasive conditions.

Excellent Airtightness: through advanced technology, such as sintering, brazing, etc., ceramic and metal form a tight bond with almost no micropores and gaps, which can effectively prevent the leakage of gases or liquids and meet the requirements of high-precision sealing.

Good Stability: Ceramic metal seals exhibit high dimensional stability and are minimally affected by environmental factors like temperature and humidity. This makes them suitable for long-term, stable operation in complex environments.

Strong customizability: according to different application scenarios and needs, we can select suitable ceramic and metal materials, adjust the seal structure and size, and realize personalized customization to meet the diversified needs of aerospace, electronics, chemical industry and other industries.

Specifications Table of Ceramic Metal Seals

Parameter	Description	Typical Values/Range
Material	Ceramic material used	Alumina (Al₂O₃), Zirconia (ZrO₂), Silicon Carbide (SiC)
	Metal material used	Stainless steel, Inconel, Titanium, Copper
Operating Temperature	Temperature range the seal can withstand	-200°C to +1500°C (depending on material)
Pressure Rating	Maximum pressure the seal can handle	Up to 100 MPa (depending on design and application)
Corrosion Resistance	Resistance to chemical attack	High resistance to acids, bases, and solvents (ceramic component)
Seal Integrity	Leak rate or helium leak test	< 1 x 10⁻⁸ Pa·m³/s (helium leak rate)
Mechanical Strength	Tensile, compressive, and shear strength	Varies widely based on material and design (e.g., tensile strength up to 300 MPa)
Thermal Expansion Coefficient	Coefficient of thermal expansion for ceramic and metal components	Ceramic: 5-10 x 10⁻⁶/K; Metal: 10-20 x 10⁻⁶/K
Surface Finish	Surface roughness of sealing surfaces	Ra < 0.8 µm (for optimal sealing performance)
Dimensional Tolerance	Precision of seal dimensions	±0.05 mm (typical machining tolerance)
Weight	Mass of the seal component	Varies based on size and material (e.g., 10 g to 10 kg)
Customization	Ability to tailor seal design to specific requirements	Yes, custom sizes, shapes, and materials available
Application Environment	Typical environments where the seal is used	Vacuum, high pressure, corrosive atmospheres, high temperatures

Applications of Ceramic Metal Seals

Ceramic metal seals find application in a variety of fields:

Aerospace: In the aerospace field, ceramic metal seals are widely used in engines, rocket propulsion systems and other key components. For example, the combustion chamber, turbine blades, and high-temperature pipelines of aviation engines need to withstand extremely high temperatures and pressures, and at the same time to prevent high-temperature gas leakage. Ceramic-metal seals can meet these harsh conditions, ensuring the efficient operation and safety of the engine.

Electronics: In the electronics industry, ceramic metal seals are commonly used in the packaging of high-precision electronic components. For example, semiconductor chips, optoelectronic devices and other sealing requirements are extremely high; ceramic metal seals can prevent the entry of external gases, moisture, etc., to protect the chip from contamination and corrosion, thereby extending the service life of electronic components. At the same time, in some high-vacuum electronic equipment, such as electron beam welding machines, vacuum coating equipment, ceramic metal seals can maintain a stable vacuum environment to ensure the normal operation of the equipment.

Chemical Industry: Plays a vital role in chemical equipment, such as reactors, pipeline connections, and valves. They prevent the leakage of corrosive media like acids, alkalis, and salts, avoiding equipment corrosion and environmental pollution.

Automotive Manufacturing: Gradually being applied in engine air intake systems, fuel injection systems, and exhaust gas treatment systems to prevent gas leakage and ensure exhaust gas purification.

Medical Devices: Used in implantable medical devices like pacemakers and artificial joints to prevent bodily fluids from entering the devices and to protect internal electronic components from affecting the human body.

Energy, Marine Engineering, Food Processing: Used in nuclear energy to prevent radioactive substance leakage, in marine engineering to withstand seawater corrosion and high-pressure environments, and in food processing equipment to ensure food safety and hygiene.

Company Profile

Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials, including boride powder, nitride powder, graphite powder, ceramic products, 3D printing powder, etc.

The company has a professional technical department and Quality Supervision Department, a well-equipped laboratory, and equipped with advanced testing equipment and after-sales customer service center.

If you are looking for high-quality Ceramic Products please feel free to contact us or click on the needed products to send an inquiry.

Applications of Ceramic Products

Process of Ceramic Products

Payment Term
T/T, Western Union, Paypal, Credit Card etc.

Shipment Term
By air, by sea, by express, as customers request.

5 FAQs of Ceramic Metal Seals

Q1: What is the principle of ceramic-to-metal seals?

Ceramic-to-metal seals are created by coating the ceramic surface with a layer of metal powder to form a uniform, dense, and weldable layer. This layer is then sintered at high temperatures to create a strong metallurgical bond. After sintering, the ceramic parts are welded to the metal parts (e.g., via vacuum welding) to form a unified structure, achieving the ceramic-metal seal.

Q2: What is the difference between ceramic-to-metal and glass-to-metal seals?

Glass-to-metal seals rely on the chemical bond between glass and the oxide film on the metal surface, whereas ceramic-to-metal seals involve sintering a metal powder coating on the ceramic surface to form a weldable layer that is then welded to the metal. Compared to glass-to-metal seals, ceramic-to-metal seals offer better high-temperature and corrosion resistance, as well as higher mechanical strength. However, they are more complex and costly to produce.

Q3: Are ceramic-to-metal seals expensive to produce?

Yes, the production cost of ceramic metal seals is relatively high. This is due to the high cost of ceramic and metal materials, as well as the complex production processes involved, such as high-temperature sintering, precision machining, and stringent quality testing. The high requirements for equipment and production environment further increase the production cost.

Q4: How can the airtightness of ceramic-to-metal seals be improved?

To enhance the airtightness of ceramic-to-metal seals, suitable ceramic and metal materials should be selected, and the seal structure design should be optimized. The quality and uniformity of the metallization layer should be improved, and the welding process should be carefully controlled. Additionally, machining accuracy and surface roughness should be strictly controlled during production. Finally, advanced testing equipment, such as helium mass spectrometry leak detectors, should be used to test the airtightness of the product.

Q5: What are the precautions for making ceramic-metal seals?

When producing ceramic-metal seals, it is crucial to select appropriate ceramic and metal materials based on the sealing requirements and determine a reasonable seal structure and size. The processing precision and surface quality should be strictly controlled to ensure the uniformity and density of the metallized layer. During welding, precise control of welding parameters is necessary to prevent defects. Finally, airtightness testing and other quality inspections should be conducted to ensure the reliability of the seals.