Custom Ceramic Machining: From Your Drawing to a Finished Part in Three Steps

Step 1: Design for Ceramic — What Your Drawing Should Say

Ceramics behave differently from metal, and a drawing that anticipates this saves iterations:

• Avoid sharp internal corners (radius ≥ 1 mm) — they are crack initiation points after sintering

• Keep wall thickness uniform; thick-to-thin transitions cause sintering distortion

• Note the operating temperature, atmosphere and applied load, not just the geometry

• Specify tolerance classes separately: as-sintered (±1%) vs ground (±0.02 mm or better)

Step 2: Green Machining and Sintering

Most custom alumina and zirconia parts are machined in the "green" (unsintered) state, when the body cuts like soft chalk but with 20–25% oversize to compensate for firing shrinkage. CNC green machining allows holes, threads, slots and complex profiles at modest cost; the part then sinters to full density at 1,500–1,700°C, shrinking precisely to nominal size.

Step 3: Diamond Grinding, Lapping and Laser Cutting

Where tolerances or surface finish matter — seal faces, plunger diameters, substrate flatness — parts are finished by diamond grinding and lapping to Ra < 0.1 µm and flatness within microns. For thin, intricate outlines such as custom substrate shapes, laser scribing and cutting produce burr-free edges without tooling cost, making it economical even at prototype volume.

Why Buyers Choose Freceramic for Custom Work

• 30+ years producing alumina, zirconia and cordierite components with in-house forming, sintering and grinding

• Tolerances to ±0.01 mm on ground diameters; laser-cut substrates and custom profiles

• ISO 9001-certified quality system; EU-tested, pollution-free materials

• Prototype-friendly sampling plus volume production on the same process line

About Freceramic

Yixing Furui'en Special Ceramics Co., Ltd. supplies custom ceramic rods, sheets, nozzles, tubes and substrates machined to drawing. Email your drawing through the contact page and receive a technical review, material recommendation and quotation — typically within one business day.