The basic classification of alumina ceramics

About the category of the alumina ceramic, there is still room for many need to discuss.
Alumina ceramics are divided into high purity type and ordinary type two kinds.
Alumina wear resistant ceramic
Type high purity alumina ceramic Al2O3 content in more than 99.9% of ceramic material, due to the sintering temperature up to 1650-1990 ℃, the transmission wavelength of 1 ~ 6 microns, usually made from molten glass to replace platinum crucible;Using alkali metal corrosion resistance is used as the transmission of light and sodium lamp tube;In the electronic industry can be used as a substrate integrated with high-frequency insulation.

Normal department of alumina ceramics by Al2O3 content is divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain, and other varieties, sometimes Al2O3 content in 80% or 75% are classified as ordinary alumina ceramic series.99 alumina ceramic materials used to make high temperature crucible, furnace pipe and special wear-resistant materials, such as ceramic bearings, seals and water valve, etc.;95 alumina ceramics is mainly used as corrosion resistant, wear resistant ceramic components;Because in 85 China often mixed with part of talc, improved the electric properties and the mechanical strength, with molybdenum, niobium, tantalum metal sealing, some used for electric vacuum devices.

评论

发表评论

此博客中的热门博文

What are the characteristics of abrasion-resistant ceramic tiles?

What are the characteristics of abrasion-resistant ceramic tiles?  Abrasion-resistant ceramic tiles are widely used in many projects, in the pit furnace is also built with a wear-resistant ceramic tiles, wear-resistant ceramic tiles not only to fire resistance, high temperature requirements, but also to wear requirements, Introduce the impact of wear-resistant ceramic tile wear-resistant factors which have! Abrasion resistance of  abrasion-resistant ceramic tiles  depends on the composition and structure of wear-resistant ceramic tiles. When the abrasion-resistant ceramic tiles are composed of dense polycrystals composed of single crystals, the wear resistance depends on the hardness of the mineral crystals. High hardness, high wear resistance of the material. When the mineral crystals are non-isotropic, the grain size is small and the wear resistance of the material is high. When the material from the multi-phase composition, the wear resistance of the material with the bulk
阅读全文

What are interlocking wear-resistant ceramic tile liner ?

图片
  The shape of ordinary wear-resistant ceramic tiles is a square sheet structure, and they are arranged in rows and columns. There are linear seams between the rows and columns of wear-resistant ceramic sheets. The linear seams along the direction of fluid flow are A smooth fluid scouring gap is formed.      In addition to the normal wear of the fluid on the surface of the wear-resistant ceramic sheet, the erosion gap becomes a breakthrough door for the fluid to wear the side of the ceramic sheet. Under the long-term erosion of the fluid, the seam will gradually widen and the degree of wear will become more and more serious. , the change of connection affects the service life of the wear-resistant ceramic sheet, which in turn affects the protection effect of the anti-wear parts. After this kind of wear-resistant ceramic sheets are pasted, the adjacent ceramic sheets do not have an interlocking effect with each other. The pasting is not strong during installation or they are easy to fal
阅读全文

Development of Ceramic Materials

图片
Ceramic is the oldest material, and it is the first chemical product made by human conquering nature. It appeared much earlier than metal materials. It is one of the symbols of human civilization and an important research object in the history of human civilization. For a long time, the development of ceramic materials relies on the teaching of craftsmanship. The products are mainly household utensils, building materials (such as bricks, glass), etc., usually called traditional ceramics. Due to the development of materials science, people have a deep understanding of the relationship between material structure and distribution. They can successfully control the chemical composition and micro - structure of lattice materials and successfully develop ceramic materials with different properties. For example, high-temperature structural ceramics and various functional ceramics (electronic materials, optical fibers, sensitive ceramic materials, etc.) have been more and more widely used, an
阅读全文