Properties Of Yttrium Oxide Ceramics

The mean specific heat of y 2 o 3 to 1600 c.

Properties of yttrium oxide ceramics.

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 thermal conductivity of yttrium oxide is 27 w m k. The distribution of dopant in glass ceramics may be totally different due to the existence of glass phase.

The mechanical properties are generally superior to ssic but the high temperature properties and the corrosion resistance are not as good. It is an air stable white solid substance. 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.

A change in lattice parameter of less than 0 007 a u. In severely anisotropic materials there can be great variation of properties. Properties of yttrium oxide ceramics properties of yttrium oxide ceramics curtis c. 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. Results indicated that a higher sintering temperature benefited the preparation of ceramic cores with excellent properties. Was observed on heating the oxide to 1800 c. 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.

These cases are illustrated by yttrium barium copper oxide ybco. Densification aids are yttrium oxide plus aluminum oxide. Ybco is a superconducting ceramic. Two samples were prepared by hot pressing yttrium oxide doped and undoped 65 mol zro 2 35 mol sio 2 nanocrystalline.

In air as indicated by petrographic x ray and differential thermal analyses. 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. Yttrium oxide also known as yttria is y 2 o 3. Yttria is often used to stabilize other ceramic compositions like zirconia.