How Ceramic Strike Faces Are Made

Picking a ceramic — alumina, silicon carbide, or boron carbide — is only half the plate design decision. The other half is how the ceramic is formed: as pressed-and-sintered tiles arranged in an array, or as a monolithic slab. The choice drives cost, multi-hit behavior, and which supplier can actually make the plate at scale.

The two production paths

Tile array

Multiple smaller ceramic tiles (typically 1-2 inch squares or hexagons) bonded together in a matrix. The array is then integrated with the fiber backing and carrier assembly.

Advantages:

Multi-hit performance is better — one damaged tile doesn't compromise the whole plate
Easier to manufacture at volume — tile shape is simpler than curved monolithic slabs
Replaceable tile possible in some designs (rare in US LE armor; more common in European designs)

Disadvantages:

Seam between tiles is a weak point; bullet hits at the seam perform worse
Labor-intensive assembly; more material handling

Monolithic slab

A single large ceramic slab (shaped to match the plate's curvature) bonded to fiber backing as one unit.

Advantages:

No tile-seam weak points
Simpler stack — fewer interfaces to manage in design
Premium visual / marketing signal

Disadvantages:

Manufacturing is harder at scale — larger pressed-and-sintered ceramics have lower yield
Single damage point can compromise the whole slab
More expensive per unit at current manufacturing technology

Modern premium Level IV plates often go monolithic. Entry and mid-tier Level III plates typically use tile arrays.

The press-and-sinter process

Regardless of tile or slab, both are produced by the same fundamental ceramic process:

Raw material preparation — ceramic powder (alumina, SiC, B4C) milled to precise particle size; additives (sintering aids) mixed in
Forming — powder pressed into shape under high pressure (typically 20-100 tons/in²)
Sintering — pressed form heated in a furnace to just below melting point (1600-2200°C depending on ceramic) for hours to days; particles fuse into a dense ceramic body
Finishing — machining to final dimensions, surface prep

Each step matters for the ballistic performance of the output:

Inconsistent particle size → inconsistent hardness
Sub-optimal press pressure → porous ceramic → reduced fracture resistance
Wrong sintering temperature → incomplete densification → failure at threat levels

Why boron carbide stays expensive

B4C has three compounding cost drivers:

Raw material — boron carbide powder is intrinsically harder to produce than alumina or SiC
Sintering — B4C requires hot pressing (simultaneous pressure + heat) for best density, which is slower and uses more specialized equipment than standard sintering
Machining — B4C is second only to diamond in hardness; machining it to final shape requires diamond tooling and takes longer

Result: at equivalent plate-size and rating, B4C costs 4-8× alumina. Silicon carbide splits the difference.

Supplier capabilities

Not every ceramic supplier makes every ceramic:

3M Ceradyne — full range; the dominant US B4C producer (Costa Mesa, CA). Strong SiC capacity. Internal ballistic-ceramic program feeds both their own armor products and OEM customers.
Morgan Advanced Materials — full range; global scale. UK-primary with US operations.
CoorsTek — strong alumina + SiC capacity in Colorado. B4C is less central to their line.
Saint-Gobain NorPro — European primary; specialty SiC applications.
II-VI Performance Ceramics (Coherent) — SiC specialist, Pennsylvania.

Why supplier mix matters

A plate OEM typically sources ceramic from one or two suppliers, not all five. Lead times, minimum order quantities, and supply-chain contracts lock in sourcing for 12-24 month periods.

This has two procurement implications:

When a ceramic supplier has a production hiccup (furnace maintenance, raw-material shortage), affected OEMs lose plate-production capacity for weeks
Plate-level Berry Amendment compliance hinges on the specific ceramic lot's production facility — same problem as the fiber side

Curved vs flat plates

All of the above applies to both flat (single-curve) and multi-curve (triple-curve / SAPI-cut) plates. Multi-curve plates add manufacturing complexity:

Tiles must be pre-formed to the curve
Monolithic slabs require pressing dies matched to the curvature
Fiber backing must cure to the same curve

Multi-curve plates typically cost 20-40% more than flat equivalents at the same ceramic and rating.