Ceramic Materials' Character

Ceramics and glasses are inorganic, nonmetallic materials consisting of metallic and nonmetallic elements bonded primarily with ionic and covalent bonds. These high strength bonds give rise to the special characteristics of these materials. They occupy a unique place in the spectrum of engineered materials offering many desirable alternatives to the metals and polymers in common usage.

General Characteristics of Structural Materials
Characteristic	Ceramics	Metals	Polymers
Density	Low to High	Low to High	Low
Hardness	High	Medium	Low
Tensile Strength	Low to Medium	High	Low
Compressive Strength	High	Medium to High	Low to Medium
Young’s Modulus	Medium to High	Low to High	Low
Melting Point	High	Low to High	Low
Dimensional Stability	High	Low to Medium	Low
Thermal Expansion	Low to Medium	Medium to High	High
Thermal Conductivity	Medium	Medium to High	Low
Thermal Shock	Low	Medium to High	High
Electrical Resistance	High	Low	High
Chemical Resistance	High	Low to Medium	Medium
Oxidation Resistance	Medium to High	Low	Low
Machinability	Medium	Low	Medium

. There are wide variations in the properties of ceramics and glasses due primarily to differences in bonding and wide variations in chemical composition. However, as a materials class, the following characteristics are typical.
	Low to moderate density compared to metals
	High modulus of elasticity (stiffness)
	Good strength retention at elevated temperatures
	Resistant to high temperature creep
	Dimensional stability
	High compressive strength
	Low to moderate tensile and shear strength
	High hardness
	Corrosion and oxidation resistant
	Good electrical insulation properties
	Wide range of thermal conductivity
	Wide range of thermal expansion coefficient
	Brittle
	Low impact strength
	Sensitive to thermal shock

Ceramics for engineering applications can be broadly broken into “traditional” and “new” materials. We define traditional materials as those produced from minerals mined directly from the earth. The newer ceramic materials, those with well defined and controlled properties are produced from nearly chemically and phase pure starting materials. Accuratus is capable of working with most of these material types.

An inventory of “new” ceramic materials is maintained at Accuratus for rapid fulfillment of your design requirements. We have a network of quality materials suppliers so that we can assure you of consistent quality materials for your applications.

Typical property characteristics for materials stocked at Accuratus are listed on each of the material pages. Personnel with extensive experience in ceramic manufacture, design and application are available for detailed discussions and consultation on the most appropriate ceramic available for your application conditions.

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