Metallized & Brazed Product

Metallized & Brazed Product

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Brazing metallized ceramics and metal, we achieves highly airtight joints (1 × 10-10 Pa · m3 / s or less).
Metallizing is the formation of a metal film on a non-metal surface.
Kovar is often used as the metal to be joined because it has a coefficient of thermal expansion close to that of ceramics,
But, as shown in the table below, it is also possible to join with various metals.

Join Variations

Product Category Materials
Al2O3 Kovar
Ti, Al, Cu
AIN, Si3N4 Cu
Sapphire SUS304, SUS316, Kovar
Be, Diamond Al, Cu, Ni
Kovar, Mo, W
Introduction Record
  • Semiconductor Industry

    Semiconductor Industry
  • Medical Industry

    Medical Industry
  • Aerospace Industry

    Aerospace Industry

Laboratory and University

  • Laboratory and University1
    Photo provided by RIKEN (SPring-8)
    SPring-8 is the world's largest synchrotron radiation facility.
  • Laboratory and University2
    Photo provided by KEK
    KEK is the world's leading accelerator science research laboratory.

Our products manufactured by our "Melting Titanium Metallizing" are used in various industries for many years of reliability and achievement.

Usage Example

  • Semiconductor Manufacturing Equipment
  • Medical Equipment
  • Vacuum Equipment
  • Various Laboratory or University
  • Artificial Satellite
  • Manufacturing Plant
  • X-ray Transmission Equipment
  • Electric Power Equipment
  • Viewing Port
  • Tanker
  • etc.

Through joining technology, we support the facilities and equipment that from the basis of people's lives in the world.

Quality Control System

We verify whether each product has the joining characteristics that satisfy the required performance, such as leak resistance, withstand voltage, insulation resistance, pressure resistance, etc.

Shape Measurement Laser Microscope

Shape Measurement Laser Microscope

It is used for high-precision observation of fine shapes.
The fine uneven shape and roughness of the surface are observed on the nano-order, and the measured fine uneven shape is visualized by gradation.
The maximum observation magnification is 2,800 times.

3D Scanner CMM Controller

3D Scanner CMM Controller

This is an equipment that measures 3D shapes.
The measured 3D shape can be visualized by gradation.
In addition, we do a quantitative evaluation of which part and how much the shape difference occurs by comparing it with the 3D CAD diagram.

Image Dimension Measurement System

Image Dimension Measurement System

It is used for dimensional measurement of incoming inspection and outgoing inspection.
In addition to dimensions such as circles, lengths, and steps, it is possible to measure geometric tolerances such as parallelism, roundness, squareness, and coaxiality.
And, the process capability index and measurement results are monitored with a trend graph from the measurement history.

X-ray Transmission Test

X-ray Non-destructive
Inspection Equipment

This equipment is used for fluoroscopy of joints at high magnification by non-destructive.
We are observing the amount of the brazing material, the voids, the fillet and the internal condition that cannot be confirmed from the outside.

High-voltage Load Test

Withstand Voltage Tester

We inspect the withstand voltage characteristics of our products.
It is possible to evaluate the withstand voltage characteristics by the voltage value according to customer's request.
In addition, tests in vacuum environment are also possible.

Heliun Leakage Test

Helium Leakage Tester

We inspect the airtightness of joints (metallized and brazed parts) or welded joints.
Normally, we do test to evaluate the amount of helium leak with
1 × 10-10 Pa · m3 / sec or less.

Commitment to Joining ~The reason to do many test~

Because there are variations.

It is common sense to carry out a leak test on all ceramics and metal joints.
This means that slight differences in conditions affect product manufacturing. The joining is so delicate and complicated.

When the metal paste reacts with the ceramics to form a metal layer, there is a difference in their coefficient of thermal expansion.
If the coating thickness, coating range, composition, temperature control, etc. of the metallized paste are not suitable, cracks will occur on the surface of the ceramics.

Even if the metal layer can be formed properly, if the adhesion of plating to it, the type and amount of brazing material, and the heat control at the time of joining are not suitable, airtightness will be poor.
If these can be controlled properly, crack-free joining can be created.

Crack-free Joining

Because the joints of ceramics are often covered with metal parts, it is not easy to find cracks.

Even internal cracks may extend over the long term, leading to poor airtightness.
Therefore, in order to prevent the occurrence of cracks, we are doing the following efforts.

Analysis of residual stress by ANSYS

Analysis of residual stress by ANSYS

Joint structure design

Joint structure design

In order to minimize residual stress, we use ANSYS or SOLIDWORKS to design suitable joining structures and also use SEM to analyze the flow of metallized layers and brazing materials.
This is how the following highly difficult joints with significantly different coefficients of thermal expansion are possible.


Aluminum (CTE 7ppm) × Alumina (CTE 26ppm)


Sapphire (CTE 7ppm) × Stainless (CTE 18ppm)

* It may not be possible depending on the shape.

Kawaso Texcel promises to deliver the highest quality products to you based on many years of experience and steady manufacturing process.

Metallized & Brazed Product

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