Good Insulation 95% Alumina Electrical Ceramic

 

95%Alumina Electrical Ceramic-the main component is Al2O3. People generally call ceramics with Al2O3 content greater than 75% high alumina porcelain. 95% alumina ceramics are the most widely use ceramics in structural ceramics. In general, the use of 95% alumina electrical ceramic is more economical and practical. However, for occasions with particularly high functional requirements, 99%~99.9% alumina ceramic select.

　First, 95% alumina electrical ceramic function:

1. The volume resistivity ρν of the volume resistivity insulation data refers to the ratio of the DC electric field strength in the direction of the sample volume current to the current density there. The formula used is ρν=EV/jv(Ωcm), where EV is the DC electric field strength and jv is the current density. Thus, 95% alumina electrical ceramic is an excellent electronic insulation material with high volume resistivity.
2. DC breakdown strengthElectrical insulation dataDC breakdown strength refers to the change of occurrence under the effect of external DC electric field. This change is mainly cause by an alteration of the internal structure. When the strength of the electric field reaches a certain value, it promotes further changes. This leads to insulation breakdown.
3. A parameter of the degree of dielectric polarization of the dielectric constant insulation material under an alternating current field is essential. In comparison, it is to the capacitance of a capacitor of the same electrode scale when vacuum use as the medium.

Second, 95% alumina thermal function:

1. The relative elongation of uniform linear expansion coefficient ceramics when increasing the unit temperature is crucial. It indicates the uniform linear expansion coefficient, one of the main functional indicators of 95% alumina ceramics.

2.Thermal shock resistance refers to the ability of ceramic materials to withstand rapid cold and heat. 95% alumina ceramic has good thermal shock resistance, and can withstand high temperature and rapid cold without damage detection.

Third, 95% alumina mechanical function:

Mechanical function refers to the ability of data to be under the effect of mechanical force without damage. Generally, according to the direction of the effect force and the force point, the tensile strength, flexural strength and compressive strength are different. The tensile strength of 95% alumina ceramic is generally above 160Mpa. This strength is generally greater than the best sealing strength.