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High Temperature Anti-Reflective Coating

Background:

Industry – Medical device
Materials Used – Titanium alloy (FDA approved), AR coated Sapphire window

Requirement:
An anti-reflective (AR) coating needed to be applied over a sapphire window and survive 1,000C high temperature braze processing. The coating of the sapphire could not show any physical delamination, crazing, or degradation of the optical properties such as transmission and/or reflectance in the specific spectral regions.

Highly Thermal Shock Resistant Glass to Metal Seal

Background:

Industry – Aerospace
Materials Used – Oxygen Free Copper, Borosilicate Glass (Corning 7740)

Requirement:
To maintain a robust hermetic seal under extreme thermal gradients. Liquid hydrogen needed to be stored in a glass tube section sealed on opposite ends to two extremely divergent materials with polar opposite material behaviors (Silicon and OFC).

Direct Bonding of Ceramic and Metal

Background:

Industry – Medical device
Materials Used – Titanium Alloy (FDA approved, not specified intentionally), Biocompatible Stabilized Zirconia

Requirement:
Requirement was to seal a component oxide ceramic and Ti metal alloy with nothing in-between. The most common sealing material in medical implant is pure Au. In this situation,

Thermal Cycle Resistant Ceramic to Metal Seal

Background:

Industry – Aerospace
Materials Used – IJ Research specified high temperature metal, IJ Research specified high temperature ceramic, IJ Research specified metallization system and braze

Requirement:
To seal two metal ring washers with a ceramic disc sandwiched for a thermal cycle application between room temperature and 850 °C while hermeticity is maintained throughout the extreme thermal excursions. For the oxidizing environmental condition of the application, the braze material needed to be non or slowly oxidizable without thermal degradation in the seal area.

Flux-less Soldering

Background:

Industry – Aerospace/optoelectronics
Materials Used – Quartz window (with AR coating), SST 304L housing

Requirement:
To Indium solder and hermetically seal quartz glass window in SST housing with no flux for an ultrahigh vacuum application.

Graphite Metallization

Background:

Industry – Defense
Materials Used – Graphite, IJ Research metallization formula

Requirement:
To metallize graphite for structural bonding of ceramic to graphite.