Ceramics give engineers properties that metals cannot, including dielectric strength, high-temperature stability, and corrosion resistance. However, challenges arise when joining these ceramics to metals in hermetic, vacuum-tight, or structurally loaded assemblies. That is where precision metallizing & brazing earn their place on the bill of materials.

At C-Mac International, we engineer ceramic-to-metal joints for electronics, vacuum systems, and high-reliability sub-assemblies. Our team treats metallizing and brazing as a single, controlled flow – one that turns a ceramic body and a metal fitting into one functional component.

Our Metallizing & Brazing Capabilities and Equipment

Ceramics will not wet with molten braze filler on their own. C-Mac solves this challenge by depositing an adherent metallic layer onto the ceramic surface before joining it to a mating metal component via a vacuum or controlled-atmosphere braze cycle.

We maintain end-to-end control over critical process variables to ensure vacuum-tight integrity and repeatable thermal performance. Our in-house capabilities include:

Moly-manganese (Mo-Mn) metallizing. Thick-film method for alumina, applied by screen printing or painting and sintered at high temperatures in a wet hydrogen atmosphere.
Nickel plating. Deposited over the metallized layer to provide a clean, wettable surface for the braze alloy.
Active metal brazing (AMB). Titanium-bearing filler alloys designed for non-oxide ceramics and single-step joint processing.
Vacuum and hydrogen furnace brazing. Precise thermal control systems to manage residual stresses during the cooling cycle.
Filler alloy selection. Silver-copper eutectic, copper-silver-titanium, and gold-based alloys for specialized medical and aerospace requirements.
Hermetic and vacuum-tight verification. Joint integrity validated through integrated helium leak testing prior to shipment.

Each assembly is built to print, with fixture design and thermal profiling matched to the part – not pulled from a generic recipe.

Material Compatibility

The primary hurdle in ceramic-to-metal joining is the mismatch in coefficient of thermal expansion (CTE). When a ceramic and a metal cool from braze temperatures, they contract at significantly different rates. Without precise joint geometry, proper filler alloy selection, and engineered fixturing, these differential contraction stresses will fracture the ceramic body.

By engineering around material physics, C-Mac matches joint geometries and thermal profiles to the specific CTE characteristics of base materials. We routinely engineer, metallize, and braze the following material combinations:

Alumina (90%, 96%, and 99.5% purity). Primary choice for high-voltage insulators, RF feedthroughs, and vacuum windows.
Zirconia (MgO and Yttria stabilized). Engineered for applications requiring high fracture toughness and thermal shock resistance.
Silicon nitride. Joined via active metal braze alloys for demanding high-temperature power electronics packaging.
Mating metals. Material selection matched to ceramic CTEs, including Kovar, Invar, copper, stainless steel, molybdenum, and nickel alloys.

Typical end-uses include vacuum feedthroughs, dielectrically insulated standoffs, X-ray and electron tube components, RF and microwave packages, and sub-assemblies for electronics industry applications.

If your assembly needs to hold a vacuum, isolate a high-voltage path, and survive thermal cycling, that is the problem we solve every week.

Why Choose C-Mac for Custom Ceramic Manufacturing?

Procurement managers and design engineers require precision parts delivered on predictable timelines without sacrificing technical oversight. C-Mac provides agile manufacturing capabilities designed to shorten lead times and de-risk complex ceramic assemblies.

Key operational benefits of partnering with C-Mac include:

Rapid 24-hour quote response. Inquiries and prints receive immediate engineering evaluation within 24 hours to keep project schedules on track.
Compressed lead times. Lean operational overhead and strategic material stocking programs keep base ceramics moving directly to production.
Cost-effective precision. Save up to 25% compared to large-volume competitors while maintaining tight tolerances.
Certified quality management. Fully certified ISO 9001 and AS9100 quality systems ensuring complete traceability for aerospace, medical, and high-vacuum applications.
Direct engineering collaboration. Engineering support from quote through final qualification, identifying thermal mismatches prior to production.

Optimize Your Ceramic-to-Metal Assembly

Most ceramic-to-metal joint failures stem from unmitigated thermal expansion mismatches early in the design stage. Catch design flaws before production begins.

Submit your engineering prints to C-Mac today. Our technical team will return a quote within 24 hours, complete with a recommended metallizing & brazing process route and an actionable production schedule.