SRI Hermetics

Capabilities

SRI Hermetics products are built with the technology, resources and experience to solve or prevent problems, while providing superior performance and value. The integration of SRIH’s advanced materials and technology into customers’ products provide optimum solutions.

The SRIH product design team provides innovative solutions to complicated hermetic packaging applications and challenging connector requirements. With extensive experience in the hermetic connector industry, the SRIH technical staff routinely provides customers with the best design-to-cost solutions.

The design of sophisticated hermetic assemblies often requires the combination of many different materials to achieve desired performance characteristics of the assembly. SRI Hermetics’ design engineers use a variety of methods to join different materials such as explosion welding, vacuum brazing and laser welding.

SRI Hermetics products are manufactured in a state-of-the-art machine shop—recently expanded to add 4,500 sq. ft and $1.5M of cutting edge machining equipment—with a full complement of turning and milling machines inside its facility to respond to quick-turn projects, tooling and critical prototype jobs.  

SRIH products are manufactured using powerful in-house capabilities, with over a dozen different machines, all the appropriate inspection tools, and a highly trained and experienced staff. These are supplemented by an established network of machining sources, which allows SRIH to optimize the machining requirements for its products, staying more flexible and nimble than competitors that practice full vertical integration.

Design Engineering
SRI Hermetics has a strong design team with a reputation for providing innovative solutions to complicated hermetic packaging applications and challenging connector requirements. With a deep history of experience in the hermetic connector industry, the SRIH technical staff routinely provides its customers with the best design-to-cost solutions for its hermetic program requirements. In addition, the integration of its advanced materials science and technology into its products helps provide customers with optimum solutions. SRI Hermetics has the technology, resources and experience to provide customers with designs that solve, or prevent, problems while providing superior performance and value.
Precision Machining
SRI Hermetics maintains a state of the art machine shop with a full complement of turning and milling machines inside its facility to respond to quick turn projects, tooling and critical prototype jobs. It has over a dozen different machines, all the appropriate inspection tools and a highly trained/experienced staff that provides a full range of capabilities.
Hermetic Sealing
SRI Hermetics uses an advanced ceramic dielectric material known as Ceramax as its primary sealing insulator. Ceramax is a phase changing compound that provides superior hermetic reliability and outstanding electrical performance with an operational temperature range of -269C to +450C. Ceramax seals are compatible with high expansion metal alloys giving SRI Hermetics the ability to seal copper alloy contacts into connector shell materials not possible with competing technologies. Aluminum, titanium and high expansion stainless steel alloys are just a few of the shell materials available to choose from.

Although its Ceramax technology offers many advantages over standard sealing methods there are still applications where glass is a better suited dielectric. Glass feedthroughs are particularly useful for high frequency match impedance connectors due to the crystalline amorphous properties of the glass which promote low loss signal transmissions. SRI Hermetics has a full line of laser weldable RF connectors that utilize glass as their dielectric and although glass seals have a reputation for hermetic failure they become very reliable when the design of the feedthrough permits the glass to remain in a neutral stress condition.
Vacuum Brazing
Vacuum Brazing is a joining process whereby a filler metal is heated to its melting temperature above 450C and distributed between two or more base materials by capillary action while protected by an oxygen free (vacuum) atmosphere.

SRI Hermetics has several vacuum brazing stations that are used for joining metal-to-metal as well as metal-to-ceramic. The primary advantages of vacuum brazing over conventional brazing is the high density, oxide free joints that are created between the parent materials and the ability to bond materials that cannot be bonded using other brazing processes.

The design of sophisticated hermetic assemblies often requires the combination of many different materials to achieve desired performance characteristics of the assembly. SRI Hermetics’ design engineers use vacuum brazing as one of their fundamental methods to join some of these different materials.
Laser Welding
Laser beam welding is a non-contact welding process that creates fusion by directing concentrated photonic radiation onto a small area. LASER (Light Amplification by Stimulated Emissions of Radiation). SRI Hermetics currently has two high power Nd:YAG laser welding systems with 4 axis CNC motion systems used for the precision joining of small metal components (SE - does Ed have more now? [Yes, he was just finsihing the buildout of the room two weeks ago, machine was in too. We should confirm with Ed, but there are now 3 of these - and SRI worked on a smaller model for Nuewave parts, so there may be a legit claim to 4 (although the 4th is a little different than the other 3)]). Laser beam welding (LBW) is ideally suited for assembly and integration of hermetic connectors due to its precise application and small heat affected zone. Connector components can be joined together and connectors can be mounted into higher level assemblies with little to no thermal stress impact. This makes it possible to weld very small parts without distortion or damage.

SRI Hermetics has a substantial number of customers who purchase its laser weldable connectors as well as many who purchase its higher level assemblies complete with connectors integrated. We also have customers who supply some of the sub-components and have SRIH do the final assembly work. In all cases, SRIH’s engineers are available to provide design and technical support.
Explosion Welding
SRI Hermetics owns exclusive technology for connector designs which incorporates the use of explosion welding to join dissimilar metals. Explosion welding (EXW) is a solid state process that uses chemical explosives to accelerate one metal into another at high velocity. This high velocity impact creates a welded interface between the two metals. SRI Hermetics uses EXW to produce bonds between metals that cannot necessarily be welded by conventional means such as aluminum to stainless steel, aluminum to titanium or titanium to stainless steel.

This unique metal joining process gives SRIH the capability of creating hermetic connectors that consist of two, or more, dissimilar metals. The competitive practice of creating unreliable seals in less than optimum connector shell materials is eliminated with SRIH’s bi-metal connector shell technology. Making use of a bi-metallic connector shell reserves one metal portion of the shell for hermetically sealing the contacts (stainless steel portion), while the other metal portion, usually the bulk of the connector, is available to meet the customer’s requirements, (typically aluminum or titanium).
Certifications
The company is ISO certified, AS9100 certified and ITAR registered.