Insulation principle and performance parameters of zirconia ceramic structural parts
There are many types of ceramic structural parts, but zirconia ceramic porcelain structural parts have better thermal insulation. Zirconia ceramic structural parts are widely used in daily life. The mechanical properties of zirconia ceramic structural parts are excellent, but when used under special conditions, the mechanical properties may decrease. In this article, the editor mainly introduces the insulation principle and performance parameters of zirconia ceramic structural parts.
1. The insulation principle of zirconia ceramic structural parts:
Zirconia ceramic structures have special optical properties that reflect high UV long-wave, mid-wave and infrared rays. Therefore, after the coating is dried, the nanoparticles will tightly fill the gaps between the coatings to form a complete air insulation layer and improve the thermal insulation performance of the coating.
Zirconia ceramic structural components have good heat insulation function and good mechanical properties, such as high strength, high fracture performance and wear resistance. But its long-term use at 100-400, especially in a humid environment, is prone to low-temperature aging, which affects the normal use of zirconia ceramic structural parts.
If this happens, different solutions should be selected according to the effects of aging and material application, usually divided into integral methods and surface methods. The overall method is to control the grain size of the zirconia ceramic component and the content of the stabilizer yttrium oxide, and at the same time add highly elastic second-phase dispersed particles to the product material. Because the low temperature aging of zirconia ceramic structural parts starts from the surface, it can also be solved by surface method.
In fact, the surface of the product material is treated to prevent the phenomenon of aging from spreading inside. The grain size and stabilizer content in zirconia ceramic component materials have a great influence on the stability of the tetragonal phase of the material, so it also has a great influence on the low temperature aging resistance of the material.
2. Zirconia ceramics are very important oxide structure ceramics second only to alumina ceramics, with high bending strength and fracture toughness. So what are the specific parameters of zirconia ceramics?
1. Zirconia ceramics are usually sintered without pressure. Pure zirconia is a white solid, and when it contains impurities, it will appear gray or light yellow. Adding a color developer can present a variety of different colors.
2. 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 does not have much effect on the properties of zirconia.
3. The sintering methods that can be used for zirconia ceramics generally include: pressureless, hot pressing and reactive hot pressing, hot isostatic pressing, microwave, ultra-high pressure, on-site pressure forming and sintering, etc.
4. The molding of zirconia ceramics includes dry pressing, isostatic pressing, grouting, hot die casting, flow, injection, plastic extrusion, colloid solidification molding, etc. The most widely used of these are injection molding and dry compression molding.