Properties Of Yttrium Oxide Ceramics

A change in lattice parameter of less than 0 007 a u.

Properties of yttrium oxide ceramics.

In severely anisotropic materials there can be great variation of properties. Yttria ceramics have been widely investigated and used due to their significant physical and chemical properties such as high melting temperature 2430 c low thermal expansion high thermal. Results indicated that a higher sintering temperature benefited the preparation of ceramic cores with excellent properties. The mechanical properties are generally superior to ssic but the high temperature properties and the corrosion resistance are not as good.

Chemical formula yba 2 cu 3 o 7 shown in figure 2d. In air as indicated by petrographic x ray and differential thermal analyses. These cases are illustrated by yttrium barium copper oxide ybco. Densification aids are yttrium oxide plus aluminum oxide.

The influences of yttrium oxide content and sintering temperature on properties of ceramic cores were studied carefully. Densification occurs above 2100ºc by a liquid phase reaction and results in a glassy second phase. Yttrium oxide also known as yttria is y 2 o 3. As the temperature was above 1400 c the reaction of al 2 o 3 and yttrium oxide occurred leading to the formation of yag phases.

It is an air stable white solid substance. Yttria is often used to stabilize other ceramic compositions like zirconia. Properties of yttrium oxide ceramics properties of yttrium oxide ceramics curtis c. Yttria overview yttria yttrium oxide y 2 o 3 is a rare earth ceramic which exhibits both exceptional plasma resistance and an aptitude for high temperature applications.

Ybco is a superconducting ceramic. Was observed on heating the oxide to 1800 c. The thermal conductivity of yttrium oxide is 27 w m k. The cubic structure of yttrium oxide is stable to 1800 c.

Its structure consists of three cubes with yttrium or barium at the centre copper at the corners and oxygen at the middle of each edge with the exception of the middle cube. The mean specific heat of y 2 o 3 to 1600 c. Two samples were prepared by hot pressing yttrium oxide doped and undoped 65 mol zro 2 35 mol sio 2 nanocrystalline. The distribution of dopant in glass ceramics may be totally different due to the existence of glass phase.