Zirconia Ceramic (ZrO2)

Zirconia Ceramic (ZrO2)
Zirconia ceramics, ZrO2 ceramics, are white, yellow or gray when they contain impurities, generally contain HfO2, and are not easy to separate. It has excellent properties such as high melting point and boiling point, high hardness, insulator at room temperature, and electrical conductivity at high temperature.
In terms of structural ceramics, zirconia ceramics are widely used in the field of structural ceramics due to their high toughness, high flexural strength and high wear resistance, excellent thermal insulation properties, and thermal expansion coefficient close to steel. Mainly include: Y-TZP grinding balls, dispersing and grinding media, nozzles, ball valve seats, zirconia molds, miniature fan shafts, fiber optic pins, fiber optic sleeves, drawing dies and cutting tools, wear-resistant knives, clothing buttons, cases and straps, bracelets and pendants, ball bearings, light bats for golf balls, and other room temperature wear-resistant parts.
In terms of functional ceramics, its excellent high temperature resistance is used as induction heating tubes, refractory materials, and heating elements. Zirconia ceramics have sensitive electrical performance parameters and are mainly used in oxygen sensors, solid oxide fuel cells (SOFC) and high temperature heating elements. ZrO2 has a high refractive index (N-21^22), adding certain coloring elements (V2O5, MoO3, Fe2O3, etc.) to the ultra-fine zirconia powder, it can be made into colorful translucent polycrystalline ZrO2 material , shining like a natural gemstone with brilliant and colorful light, it can be made into a variety of decorations. In addition, zirconia is being widely used in thermal barrier coatings, catalyst carriers, medical care, health care, refractories, textiles and other fields.
Among various metal oxide ceramic materials, zirconia has high temperature thermal stability, good thermal insulation performance and strong toughness, and is suitable for ceramic thermal insulation sleeves and high temperature refractory products. Zirconium-based ceramic pigments with zirconia ceramics as the main raw material are important components of glazes; the thermal conductivity of zirconia is low among common ceramic materials, and the thermal expansion coefficient is close to that of metal materials, making it an important structure. The special crystal structure of zirconia ceramics makes it an important electronic material.

The molding of zirconia ceramics includes dry pressing molding, isostatic pressing molding, injection molding, grouting molding, hot die casting molding, tape casting, plastic extrusion molding, colloidal solidification molding, etc. Among them, isostatic pressing, injection molding and dry pressing are widely used.

Material properties of Zirconia ceramic

Description	Unit	Value
Density	g/cm3	6.05
Water Absorption	%	0
Thermal expansion coefficient	10-6 /k	10.5
Young's modulus of elasticity	Gpa	210
Poisson's ratio	/	0.3
Hardness (HV)	MPa	1200
Bending strength (room temperature)	MPa	950
Bending Strength (700℃)	MPa	210
Compressive strength (room temperature)	MPa	2000
Fracture toughness	Mpa.m1/2	10
Thermal conductivity (room temperature)	W/m.k	2
Specific resistivity (room temperature)	Ω.mm2/m	＞1015
Operating temperature	℃	≤1350
Acid and alkali corrosion resistance	/	Strong

Zirconia ceramics are a new type of advanced technical ceramics, mainly divided into three types of magnesium-stabilized zirconia ceramics, cerium-stabilized zirconia and yttrium-stabilized zirconia. All three kinds of zirconia ceramics have excellent physical and chemical properties. They have not only become research hotspots in the field of scientific research, but also have been widely used in industrial production. They are important raw materials for refractory materials, high-temperature structural materials and electronic materials.