Metallized Ceramic Components

Custom Ceramic-to-Metal Vacuum Electrical Feedthrough

Ceramic-to-metal vacuum electrical feedthrough，Custom alumina ceramic-to-metal vacuum feedthroughs for reliable electrical power and signal transmission through sealed vacuum systems.

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Description

TecCera supplies custom ceramic-to-metal vacuum electrical feedthroughs for transmitting electrical power, signals or measurement connections through sealed vacuum chamber walls.

High-purity alumina ceramic provides electrical insulation between the conductor and metal housing. The metallized ceramic is joined to compatible metal components through controlled brazing to create an electrically insulating sealed assembly.

Voltage, current, temperature and leak-rate requirements are configuration-dependent. Each feedthrough should be specified according to its conductor size, pin configuration, ceramic geometry, flange type and operating environment.

Product Overview

Item	Typical Range / Available Options
Product Type	Ceramic-to-metal vacuum electrical feedthrough
Function	Transmission of electrical power or signals through a vacuum boundary
Insulation Material	95%–99% alumina
Seal Construction	Metallized ceramic-to-metal brazed assembly
Pin Configuration	Single-pin or multi-pin
Flange Options	CF, KF, ISO or custom mounting interface
Conductor Materials	Copper, copper-cored alloys, molybdenum, Kovar or NiFe alloys
Housing Materials	Stainless steel, Kovar, Inconel or compatible alloys
Electrical Configuration	Grounded, isolated, single-ended or double-ended
Dimensions	Customized according to customer drawings

Typical Performance Range

No.	Parameter	Typical Range / Specification	Unit
1	Maximum Working Voltage	1–125	kV DC
2	Rated Current	1–1000	A
3	Helium Leak Rate	≤ 1×10⁻¹⁰ to 1×10⁻⁹	atm·cc/s He
4	Operating Temperature Range	−269 to +450	°C
5	Insulation Material	95%–99% alumina	—
6	Conductor and Housing Materials	Kovar, copper, copper-cored alloys, stainless steel, Inconel, molybdenum or NiFe alloys	—

The values above represent the possible range across different designs. Maximum voltage, maximum current and maximum temperature are not necessarily available simultaneously in one feedthrough. Final ratings must be confirmed for the specific configuration and test conditions.

Key Features

Ceramic-to-Metal Sealing

The alumina insulator is metallized and brazed to compatible metal conductors or housings, providing electrical isolation across the vacuum boundary.

Custom Electrical Ratings

Conductor diameter, ceramic creepage distance, insulation thickness and pin spacing can be configured according to the required voltage and current.

Single-Pin and Multi-Pin Designs

Feedthroughs can be evaluated with single or multiple conductors for power transmission, signals, instrumentation and measurement connections.

Configurable Mounting Interfaces

CF, KF, ISO and custom mounting interfaces can be evaluated according to the required vacuum level, chamber size and installation method.

Material Selection

Ceramic grade, conductor material, housing material and brazing alloy are selected according to electrical load, thermal cycle, vacuum requirement and material compatibility.

Available Configurations

High-voltage electrical feedthroughs
High-current power feedthroughs
Single-pin feedthroughs
Multi-pin feedthroughs
Signal and instrumentation feedthroughs
Grounded or electrically isolated housings
Single-ended or double-ended conductors
CF, KF and ISO flange-mounted designs
Custom threaded or welded mounting interfaces
Coaxial configurations subject to connector and impedance requirements

Power, signal, coaxial, thermocouple, fluid and rotary feedthroughs are different product categories. Their specifications should not be combined into one product model.

Detailed Product Information

A vacuum electrical feedthrough must provide both electrical insulation and a sealed mechanical interface. Its performance depends on the complete assembly, including the ceramic geometry, metallization, conductor material, housing material, brazing alloy and joint design.

High-voltage designs require adequate ceramic thickness, creepage distance and electric-field control. High-current designs require a suitable conductor cross-section and thermal management. These requirements must be evaluated independently because one design normally cannot provide the maximum voltage, current and temperature ratings at the same time.

Material compatibility must also be considered during brazing and operation. Differences in coefficients of thermal expansion between alumina, copper, Kovar, stainless steel and other alloys can generate residual stress. The final design should therefore be reviewed as a complete ceramic-to-metal assembly.

Typical Applications

Semiconductor processing equipment
PVD and CVD vacuum systems
Vacuum coating equipment
Electron microscopes
Mass spectrometers
Particle accelerators
Vacuum furnaces
X-ray equipment
Surface-analysis instruments
Scientific vacuum chambers
Electrical testing systems
Custom vacuum electronic equipment

Information Required for Customization

Please provide:

Required voltage and current
DC, AC, pulse or signal application
Pin quantity and arrangement
Conductor material and diameter
Housing or flange type
Vacuum level and helium leak-rate requirement
Operating and bakeout temperatures
Ceramic material preference
Grounded or isolated configuration
Dimensional drawing or available installation space
Mating connector requirements
Required quantity
Inspection and test requirements

Frequently Asked Questions

What is the maximum bakeout temperature?

The allowable bakeout temperature depends on the ceramic, conductor, housing, brazing alloy, connector and sealing construction. A maximum temperature should only be confirmed after the complete configuration has been reviewed.

How should I choose between CF, KF and ISO flanges?

CF flanges are commonly selected for high- and ultra-high-vacuum systems requiring metal gasket sealing. KF flanges are suitable for compact systems requiring convenient installation. ISO flanges are commonly used for larger vacuum connections. The final selection depends on chamber size, vacuum level, bakeout temperature and installation requirements.

Can the voltage and current be customized?

Yes. Voltage and current ratings can be evaluated by adjusting the ceramic geometry, creepage distance, conductor size, pin spacing and material system.

Can you manufacture multi-pin feedthroughs?

Yes. Please provide the number of conductors, pin arrangement, electrical ratings, isolation requirements and dimensional limitations for evaluation.

Does every model achieve the same helium leak rate?

No. Leak performance depends on the complete feedthrough design, assembly process and test conditions. The required helium leak rate and test method should be stated on the drawing or purchase specification.

Is this a rotary feedthrough?

No. This product transmits electrical power or signals through a vacuum boundary. A rotary feedthrough transmits mechanical rotation and requires specifications such as shaft diameter, rotational speed, torque, bearing arrangement and rotary seal type.

Request a Quote

Send TecCera your electrical ratings, vacuum requirements, flange type, pin configuration, operating temperature, drawing and required quantity. We will review the ceramic-to-metal sealing structure before providing a quotation.

Technical Resources

Download the TecCera brochure for metallized alumina components, ceramic-to-metal brazed assemblies, hermetic seals, and vacuum feedthrough solutions.

Download Metallized Ceramics Brochure (PDF)

How to Get a Quote

Send us your drawing or technical requirements. We will review the material, dimensions, tolerances and application conditions before quotation.

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