Strength Comparison of Zirconia Ceramics

Comparison of strength between zirconia ceramics and other materials

The specific strength of zirconia ceramic structural components. Generally, any material has a specific strength to represent the relationship between quality and strength. In order to choose a suitable zirconia ceramic structural component, let's better understand the specific strength of the product.

Pure zirconia is a white solid that appears gray or light yellow when containing impurities. Adding colorants can also display various other colors.

The molecular weight of pure zirconia is 123.22,

The theoretical density is 5.89g/cm3 and the melting point is 2715 ℃.

Usually contains a small amount of hafnium oxide, which is difficult to separate, but has no significant impact on the performance of zirconia.

Zirconia has three crystal forms: monoclinic, tetragonal, and cubic. At room temperature, zirconia only appears as a monoclinic phase, and when heated to around 1100 ℃, it transforms into a tetragonal phase. When heated to a higher temperature, it transforms into a cubic phase.

Due to the significant volume changes that occur during the transition from monoclinic to tetragonal phases, and during cooling, significant volume changes occur in the opposite direction, which can easily cause product cracking and limit the application of pure zirconia in the high-temperature field. However, after adding stabilizer (such as Yttrium(III) oxide), the tetragonal phase can be stabilized at room temperature, so no volume change will occur after heating, greatly expanding the application range of zirconia.

Performance parameters of zirconia ceramic (ZR02):

Volume density: 5.5~6.05g/cm ^ 3;

Melting point: Theoretically, zirconia ceramics have a high temperature resistance of 2715 ℃; The sintering temperature of commonly used zirconia ceramics in the second market is generally between 1500 ° C and 1550 ° C.

Flexural strength: 1100MPa;

Fracture toughness: 12MPam ^ (1/2);

Hardness: 88~90HRA;

Elastic modulus: 220GPa;

Linear expansion coefficient: (6.5~11.2) X10 ^ (-16)/K;

Minimum achievable residual imbalance:≤ 0.8Gmm/kg;

Imbalance reduction rate:≥ 85%

The specific strength of zirconia ceramic structural components is the strength of the zirconia ceramic structural component material, which is the force per unit area at the time of fracture divided by its apparent density. Also known as the strength to weight ratio. The ratio of the tensile strength of a material to its apparent density is called specific strength. The legal unit of specific strength is N/T, and it is customary to sometimes refer to specific strength as strength. The ratio of strength to density at the fracture point of zirconia ceramic structural material, expressed in centimeters.

A high-quality zirconia ceramic structural component material should have a high specific strength in order to meet the strength requirements with a smaller cross-section as much as possible, while significantly reducing the self weight of the structure itself. The higher the specific strength, the lighter the material used to achieve the corresponding strength.

Website: https://www.zhengtaifeng.com/