# Technical Ceramics in Manufacturing
Technical ceramics are machined green before firing or ground hard after it, and which stage a feature is cut in governs its cost. Sintering shrinks the part by a stated percentage, so green dimensions are not finished dimensions.

# Technical Ceramics in Manufacturing

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Technical ceramics are machined green before firing or ground hard after it, and which stage a feature is cut in governs its cost. Sintering shrinks the part by a stated percentage, so green dimensions are not finished dimensions.

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Ceramics are the material where the process sequence rather than the geometry decides the price, and a buyer who does not know that reads the quote as arbitrary. The programme argument is in [manufacturing SEO](/manufacturing-seo).

## The materials and what selects them

**Alumina is the general-purpose technical ceramic**, insulating and wear resistant, and the majority of industrial ceramic parts are made from it.

**Zirconia carries higher toughness and resists cracking better**, which is why it appears where a ceramic part sees mechanical load. **Silicon carbide carries hardness and thermal conductivity** and is specified for seal faces and abrasive service.

**Macor and machinable glass-ceramics are a separate case**, cut with conventional tooling to final dimension without firing, and they trade properties for that convenience.

**Diamond grinding is the only practical way to cut a fired ceramic**, which is why the stage a feature is machined in matters more here than the feature itself.

## Green and hard machining are different jobs

**Green machining cuts the unfired body with conventional tooling** and is comparatively cheap. **Hard machining after sintering requires diamond grinding** and costs many times more per feature.

**Sintering shrinkage is a stated percentage of the green dimension**, and the part is machined oversize to land on size after firing. That shrinkage is predictable rather than exact, which is why an achievable [tolerance](/glossary/tolerance) on a green-machined feature is looser than on a ground one.

The commercial consequence is a single question: which features must be ground? **Every feature moved from green to hard machining multiplies its cost**, so a drawing that calls tight tolerances everywhere is quoting itself into hard machining throughout.

## What a capability page should state

**A capability page must state process, materials, tolerances, capacity, certifications, and industries served**, and ceramics belong there split by stage.

State whether the shop green machines, hard grinds, fires in-house, or subcontracts the kiln. Name the materials run and the achievable tolerance for each stage separately, since one number for both is meaningless.

The structure is at [capability page structure](/content/capability-page-structure) and the cluster reasoning at [materials](/materials).

## Common questions

**Why are ceramic parts quoted so differently between suppliers?**

Because suppliers assume different stages. One quotes green machining with as-fired tolerances, another quotes ground features, and the parts are not comparable.

**Can a ceramic part be machined conventionally?**

Green, yes. Fired, only by diamond grinding, except for machinable glass-ceramics which are designed for it.

**How much does a part shrink?**

A stated percentage that varies by material and process. It is predictable enough to design around and not exact enough to ignore.

**Which ceramic for a wear surface?**

Silicon carbide for hardness, zirconia where impact matters, alumina where cost matters and the service is moderate.
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Source: https://manufacturingseo.ai/materials/technical-ceramics/
Last reviewed: 2026-08-11
Author: ManufacturingSEO.ai