Oxide Ceramics｜Zirconia Toughened Alumina Ceramic (ZTA)

Although ceramic materials have many superior properties, such as high temperature mechanical properties, chemical corrosion resistance, electrical insulators, high hardness and wear resistance, etc., due to their structure, ceramic materials lack the ability to slip under stress and cause plastic deformation like metals do, it is prone to defects, cracks, and easily lead to high stress concentration, which determines the nature of the brittleness of ceramic materials.

Zirconia toughened alumina ceramics (referred to as composite ceramics, ZTA), white, corrosion resistance, good chemical stability. Alumina has high hardness and zirconia has good toughness. The two materials form an excellent composite with high strength and high toughness, and are more widely used. It has higher flexural strength and fracture toughness at room temperature, so zirconia toughened alumina ceramics have good wear resistance. The specific ratio of the two materials can be adjusted according to the actual use requirements of users. The performance of zirconia toughened alumina ceramics is better than that of 99% alumina ceramics, and the price is much lower than that of zirconia ceramics; many occasions where alumina ceramics are not competent, reflect a better cost performance than zirconia ceramics. This material is widely used in machinery, electronics, petroleum, chemical, aerospace and textile industries.

Material Properties of Zirconia Toughened Alumina Ceramic (ZTA)

Parameter	Unit	Value
Bulk Density	g/cm3	3.8 ~ 4.6
Rockwell hardness	HRA≥	86 ~88
Bending Strength	Mpa≥	172~450
Operating Temperature	℃	1400~1500
Linear Expansion Coefficient	×10-6/℃
Dielectric Constant	εr(20℃,1MHz)
Dielectric Loss	tanδ×10-4,1MHz
Volume Resistivity	Ω·cm(100℃)
DC Breakdown Strength	KV/mmDC≥
Acid Resistance	mg/cm2≤
Alkali Resistance	mg/cm2≤
Wear Resistance	g/cm2≤
Compressive Strength	Mpa≥	2300 ~2900
Rupture Strength	Mpa≥
Elastic Modulus	Gpa
Poisson's Ratio	/
Thermal Conductivity	W/m·K(20℃)