Properties Of Yttrium Oxide Ceramics

Two samples were prepared by hot pressing yttrium oxide doped and undoped 65 mol zro 2 35 mol sio 2 nanocrystalline.

Properties of yttrium oxide ceramics.

Was observed on heating the oxide to 1800 c. This study examines the distribution of y 3 ions in a zro 2 sio 2 glass ceramic. The mean specific heat of y 2 o 3 to 1600 c. Results indicated that a higher sintering temperature benefited the preparation of ceramic cores with excellent properties.

The distribution of dopant in glass ceramics may be totally different due to the existence of glass phase. A change in lattice parameter of less than 0 007 a u. It is an air stable white solid substance. Yttrium oxide also known as yttria is y 2 o 3.

1957 08 01 00 00 00 the most inert shows only partial wetting even a t atmospheric pressures and equilibrium conditions are easily attained platinum although it does not have stable oxides a t the usual test temperatures appears to have sufficient oxygen affinity to follow the sequence described in the. 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. That is it loses all resistance to electric current at extremely low temperatures. Yttria is often used to stabilize other ceramic compositions like zirconia.

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. These cases are illustrated by yttrium barium copper oxide ybco. In air as indicated by petrographic x ray and differential thermal analyses. 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.

Ybco is a superconducting ceramic. Densification occurs above 2100ºc by a liquid phase reaction and results in a glassy second phase. The thermal conductivity of yttrium oxide is 27 w m k. The influences of yttrium oxide content and sintering temperature on properties of ceramic cores were studied carefully.

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. Chemical formula yba 2 cu 3 o 7 shown in figure 2d. The cubic structure of yttrium oxide is stable to 1800 c.