Metal Ceramic and Glasses Designation & Processes R. Lindeke ME 2105.
Chapter 37 Processes Used to Finish Ceramic Materials.
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Transcript of Chapter 37 Processes Used to Finish Ceramic Materials.
Chapter 37
Processes Used to Finish Ceramic Materials
Objectives
• Polishing and lapping to remove minor imperfections.
• Grinding to remove larger defects.• Glazing ceramics.• Decorating ceramics.
Grinding & Polishing
• Setters are solid masses of clay of the same composition as the part, placed under certain areas of the work piece for support.
• These setters cause imperfections that may require grinding.• Precision grinding: Silicon carbide grains provide extreme
hardness and are an ideal candidate for use in grinding, polishing, lapping, and pressure blasting applications on glass and ceramics.
• Flame polishing melts the thin surface layer of the product to reduce the size and quantity of surface defects.
Glazing• A glaze is a specially formulated glass that melts on the surface of the ceramic
work piece and adheres to the body after cooling.• Glazes are often applied to provide an impermeable surface on a porous product.• Glazes are also applied to improve the appearance of a product by giving it a
glossy surface.• A glaze is applied by curtain coating in recent years because it reduces the amount
of airborne contaminants produced.• Glaze additives: Colors can be applied before glazing or after glazing. • Gilding: The application of a gold gilt after glazing on products such as china, is
normally done by hand.• Banding: Banding is normally done with silver, or with a color complementing the
graphic design on the product.• Heat blocking ceramic finishes: A coating of ceramic paint can act like six inches of
fiberglass insulation when applied to any surface such as walls and roofs.
Summary• Precision grinding: Silicon carbide grains provide extreme hardness and
are an ideal candidate for use in grinding, polishing, lapping, and pressure blasting applications on glass and ceramics.
• Flame polishing melts the thin surface layer of the product to reduce the size and quantity of surface defects.
• A glaze is a specially formulated glass that melts on the surface of the ceramic work piece and adheres to the body after cooling.
• Gilding: The application of a gold gilt after glazing on products such as china, is normally done by hand.
• Banding: Banding is normally done with silver, or with a color complementing the graphic design on the product.
• Heat blocking ceramic finishes: A coating of ceramic paint can act like six inches of fiberglass insulation when applied to any surface such as walls and roofs.
Home Work
• 1. What material is used for precision grinding of ceramic products?
• 2. Give two reasons for applying glazes on ceramic products?