Magnesia stabilized zirconia ceramics, zirconia toughened ceramics prepared with magnesium oxide as a stabilizer. According to the different content of magnesium oxide stabilizer and the difference in preparation process, they can be prepared separately< font face="Microsoft Yahei">cubic zirconiaand metastable tetragonal zirconia ceramics. By controlling the nucleation growth of the tetragonal phase, magnesium oxide with the best flexural strength and fracture toughness can be obtainedPartially Stabilized Zirconia Ceramics . Its application is roughly the same as that of yttria-stabilized zirconia ceramics. And because of its unique thermal shock resistance, it is widely used in metallurgy, steel and petrochemical industries. It can also be used in manufacturing Special ceramic cutting tools and standard measuring tools for the machinery and textile industryMechanical seal, stamping dies and various wear-resistant parts, etc.
Yttria stabilized zirconia ceramics, English abbreviationY-TZP. Use yttrium oxide (Y2O3) as the stabilizer Zirconia toughened ceramics prepared under these conditions. Generally, when the molar fraction of yttria is 2% to 3%, it is called "yttria-stabilized tetragonal zirconia polycrystalline"; when the molar fraction of yttria is above 8%, It is called "yttria-stabilized cubic phase zirconia polycrystalline" with high strength, good fracture toughness, high hardness, high elastic modulus, linear expansion coefficient similar to metal, good wear resistance, non-magnetic, and resistant to acid and alkali media corrosion. Mainly used in oil extraction, communication equipment manufacturing, Chemical fiber, measuring tools, clocks and other industries.
Compared with magnesia-stabilized zirconia and yttria-stabilized zirconia, its outstanding advantage is that it is relatively It has excellent mechanical properties and creep resistance at high temperatures, but the research and development of magnesium-stabilized zirconia is restricted by two unfavorable factors: First, the solid solution temperature of magnesium oxide in the cubic zone of zirconia is very high, resulting in magnesium Stable and stable zirconia is not easy to be completely sintered; secondly, magnesium oxide is prone to crystal phase separation and a large amount of tetragonal phase instability when the zirconia temperature is higher than 1000°C, which causes the material performance to decline and seriously restricts its performance at high temperatures. area application. Therefore, the focus of future research on using magnesium oxide to stabilize zirconia is to reduce the sintering temperature and achieve low-temperature sintering; at the same time, it can improve its high-temperature mechanical properties and expand its application range.
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