Magnesium oxide (MgO) ceramic
Magnesium oxide ceramics are ceramic with magnesium oxide as the main component. It belongs to the cubic crystal system and the melting point of which is 2800 ℃. Magnesium oxide is volatile in temperature of higher than 2300 ℃, therefore, magnesium oxide products are generally restricted to use below 2200 ℃.
Mullite ceramic refers to the ceramic of the main crystal phase for mullite.
Due to the excellent thermal properties and mechanical properties while the not outstanding room temperature performance of mullite, high-purity mullite ceramics are mainly used in the high-temperature environment:
Zirconia toughened alumina （ZTA）
Zirconia toughened alumina ceramics is a kind of compound material which is used to induce phase change with the toughening of ZrO2 and to inhibit the growth of the grain of alumina body. Compared with a single alumina ceramic, it has the higher flexural strength and fracture toughness.
Zirconia toughened mullite ceramics（ZTM）
Zirconia toughened mullite ceramic is a kind of zirconia phase change toughened ceramics with mullite as the matrix.
Mullite has a high temperature, high strength, good fracture toughness, chemical stability and thermal shock resistance. Adding zirconium dioxide toughened mullite, there are two toughening mechanisms of stress-induced phase change and microcrack toughening.
Zirconia toughened mullite ceramics can be used to make tools and some parts of an adiabatic engine.
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