Kovar® Alloy Matched Glass-To-Metal Seals Hermetic Testing MIL-DT

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Kovar® Alloy Matched Glass-To-Metal Seals Hermetic Testing MIL-DT

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MIL-DTL-83513 Connectors
Kovar® Alloy Matched Glass-To-Metal Seals Hermetic Testing
MIL-DTL-83513 Type Micro-D Hermetic Connectors
MICRO-D HERMETIC CONNECTORS
Hermeticity defined "the state condition being airtight". Sophisticated military electronics enclosures experience electrical failure from ingress moisture. System engineers design enclosure withstand exposure moisture condensation using "moisture-hardened" components conformal coatings, often most practical approach install hermetically sealed electrical connectors. Glass-to-metal seals provide assurance that, over life enclosure, accumulated amount water vapor inside will exceed amount necessary form condensation. Other applications Micro-D hermetic connectors include vacuum chambers, cryogenics, enclosures filled with inert gas.
Glenair's hermetic Micro-D shells contacts made from special alloy called Kovar®, iron-nickel-cobalt alloy consisting This alloy covered specification AMS-I-23011. Kovar relatively coefficient thermal expansion.
Micro-D Hermetic Plating Options
Unlike regular connectors which plated components prior assembly, hermetic connectors electroplated after parts fired cleaned oxides. Typically contacts gold-plated connector shell nickel-plated.
Matched seals rely chemical bond between metal glass. Kovar contacts shells first exposed high temperatures order develop oxide coating. Then, borosilicate glass metal components assembled with fixtures fused firing furnace 900° strong chemical bond created between metal glass. Unlike compression seals which rely different thermal coefficients expansion between glass metal, matched seal offers better resistance stress from thermal extremes.
Connector Installation
Hermetic connectors typically soldered welded into panels bulkheads. Laser welding good option connector mounted onto Kovar. panel aluminum alloy stainless steel, then soldering recommended. Micro-D's with o-ring seals offer another alternative. O-rings, when installed properly, will provide very permeability seal. seating surface must free from scratches imperfections. finish acceptable, finish preferred. o-ring coated with light coat vacuum grease.
Micro-D hermetic connectors 100% tested prior shipment. helium leak test performed certify hermetic seal. This test conducted inducing Avacuum side connector. Helium released other side, mass spectrometer "counts" number helium molecules that penetrate connector seal. Helium leak testing takes advantage small size helium molecule compared water vapor. Helium inert, rare atmosphere, easy detect with mass spectrometer.
Hermetic Connector
Helium Leak Tester
2009 Glenair, Inc. www.glenair.com
Helium Tank
CAGE CODE 06324
Printed U.S.A. E-Mail: sales@glenair.com
GLENAIR, INC. 1211 GLENDALE, 91201-2497 818-247-6000 818-500-9912
MIL-DTL-83513 Type Micro-D Hermetic Connectors
MICRO-D HERMETIC CONNECTOR DESIGN NOTES "Why can't hermetic Micro-D with contacts instead sockets?" "What about high pressure?" "What maximum recommended pressure rating hermetic Micro-D?"
Glenair hermetic Micro-D's built safely withstand 1000 hydrostatic pressure open face (unmated) condition.
Micro-D TwistPin contact cannot made from materials that required hermetic contacts. Hermetic contacts made from ferrous alloys such Kovar® Alloy These alloys have spring properties. Micro-D TwistPin contact made from spring-temper beryllium copper. Micro-D socket contact cylinder does provide spring force, Micro-D hermetic connectors always receptacle connectors with socket contacts.
MICRO-D CONTACT ARRANGEMENTS (FACE vIEW SOCKET CONNECTOR)
Socket
Socket
Socket
Socket
Socket
Socket
Socket (Standard Row)
Socket (Special Row)
Socket
2009 Glenair, Inc. www.glenair.com
CAGE CODE 06324
Printed U.S.A. E-Mail: sales@glenair.com
GLENAIR, INC. 1211 GLENDALE, 91201-2497 818-247-6000 818-500-9912
MIL-DTL-83513 Connectors

Kovar® Alloy Matched Glass-To-Metal Seals Hermetic Testing MIL-DT

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