Nanostructured Zirconia – Types, Properties and Applications

By AZoNano

Table of Contents

Overview
Nanosized Zirconia
Classification of Zirconia Products
Nano Zirconia
3YSZ Partially Stabilized Zirconia
8YSZ and 10YSZ Stabilized Zirconia
About INNOVNANO

Overview

Tetragonal zirconia is a highly important structural ceramic material having superior mechanical characteristics, increased fracture toughness, hardness, strength and good chemical resistance. Other interesting characteristics of Tetragonal Zirconia have resulted in a variety of industrial applications that include medical prosthetics, cutting tools, dental reconstruction, synthetic jewels, high density grinding media, wear components, bearings, seals, valves, nose cones and tiles for space shuttles and missiles, cigarette filters and many more.

Nanosized Zirconia

Nano Tetragonal Zirconia with its superplastic deformation and high hardness levels makes an extremely promising candidate in the field of advanced ceramics. Property enhancements are also anticipated because of its superior sinter activity at low temperature offering easy to control grain growth.

The fully stabilized Zirconia powders are suited for evolving high temperature energy conversion systems, like solid oxide fuel cells (SOFC) and sensors (NOx and O2), due to its high oxygen ion transport capabilities and good long-term stability.

Non Transformable Tetragonal Zirconia (T'Z) is used broadly in thermal barrier coating applications due to its relatively high thermal expansion coefficient, low thermal conductivity and phase stability. Tetragonal Zirconia has been proved suitable for petrol and diesel engines, turbines and the most demanding aviation engines.

INNOVNANO offers a complete range of Zirconia Products:

Classification of Zirconia Products

Zirconia products can be widely classified into the following types:

3YSZ Partially Stabilized Zirconia

3YSZ grades are nano structured partially stabilized Zirconia, producing ceramic bodies with high density and small grain size.

Chemical Analysis
ZrO2 + Y2O3+ HfO2 (wt%) > 99.9
Y2O3 (wt%) 5.2± 0.2
SiO2 < 0.03
Fe2O3 < 0.025
Na2O < 0.01
Physical Analysis
BET (m2/g) 16± 3
Crystallite Size (nm) 12
Aggregate size (nm) 200
Granule (μm) 60
Primary Particle Size (nm) 50

8YSZ and 10YSZ Stabilized Zirconia

8YSZ and 10YSZ grades are nanostructured fully stabilized Zirconia, resulting in sintered bodies with high ionic conductivity and heat insulating properties.

Chemical Analysis
8YSZ 10YSZ
ZrO2 + Y2O3+ HfO2 (wt%) > 99.9 > 99.9
Y2O3 (wt%) 13.3 ± 0.2 15.5 ± 0.2
SiO2 0.02 0.02
Fe2O3 0.02 0.02
Al2O3 < 0.02 < 0.02
Na2O ≤ 0.01 ≤ 0.01
Physical Analysis
BET (m2/g) 16 ± 3 16 ± 3
Crystallite Size (nm) 18 15
Granule (μm) 60 60
Aggregate Size (nm) 200 200
Primary Particle Size (nm) 50 50
Mechanical Properties
Hardness (Hv 10) 1400 1400
Sintering Temperature (°C) 1400 1400
Grain Size (nm) <250 <400
Sintered Density (g/cm3) 5.90 5.80
Bending Strength (MPa) 400 250
Ionic Conductivity (S/m) >4.0 >3.0

About INNOVNANO

INNOVNANO (part of CUF, the largest Portuguese chemical group), with its corporate Headquarter located in Lisbon, has developed a unique and innovative proprietary patented process. The process is defined as high-pressure semi continuous process for the large-scale production of nanomaterials and advanced ceramic powders.

Using this technology INNOVNANO is able to produce commercial quantities of metal oxides, doped metal oxides, and composite nanoparticles in the range of 20 nm to 60 nm.

This information has been sourced, reviewed and adapted from materials provided by INNOVNANO.

For more information on this source, please visit INNOVNANO.

Date Added: Feb 10, 2012 | Updated: Jul 15, 2013
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