The alumina ceramic​ lining board above 99 is the best among the ceramic lining boards, and the unit price is extremely high, but its physical properties are also excellent, with high hardness and good toughness. It is especially suitable for parts with severe impact and wear.

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As a widely used material in ceramics, alumina ceramics presents the following development trends along with the development of the entire industry: (1) The level of technical equipment will be rapidly improved: the development of computer technology and digital control technology has promoted the technological progress and rapid development of the ceramic material industry, such as automatic control of continuous sintering kilns, high-power and large-capacity grinding equipment, and high-performance powder manufacturing Complete sets of equipment such as granular equipment and other net pressure forming equipment have beneficially promoted the improvement of the overall level of the industry, and at the same time, the production efficiency and product quality have also been significantly improved;

Alumina ceramics is an industrial ceramic with high hardness, which can only be processed by diamond grinding. It is made of bauxite and can be processed by injection molding, pressing, isostatic pressing, sliding castings and other methods.

High temperature resistance: Alumina ceramics can be used in the atmosphere up to 1650°C or 2900°F, and in the vacuum environment of 2000°C or 3600°F. At 1000 degrees Celsius, it maintains 50% of its tensile strength at room temperature. Although the strength of metals is weakened in high temperature environments, alumina ceramics retain their strength when they return to normal temperatures and remain unchanged. Alumina ceramics have high electrical resistivity and can reduce thermal shock, and increased purity will increase their electrical resistivity. Alumina ceramics become a perfect insulating material due to its dielectric level, etc., and current cannot pass through them.

1. In terms of machinery, the bending strength of Al2O3 porcelain sintered products can reach 250Mpa, and the hot-pressed products can reach 500Mpa. The Mohs hardness of Alumina ceramic can reach 9, and it has excellent wear resistance, so it is widely used in the manufacture of tools, ball valves, grinding wheels, ceramic nails, bearings, etc. Among them, Al2O3 ceramic tools and industrial valves are widely used.

Alumina ceramic parts are used in many industrial production occasions, which fully shows that ceramic parts have many superior properties compared to other materials, and they will become popular in the industry. At present, alumina ceramics can be mainly used for protection tubes and insulating tubes of temperature measuring instruments, thermocouple thermometers; at the same time, it can also be used in furnace tubes of industrial resistance furnaces, experimental electric furnaces, and heat treatment furnaces.

First of all, we want to introduce the crystal types of alumina. Alumina has three types of crystals, ionic crystals and atomic crystals, and one is somewhere in between. So, what does it have to do with alumina ceramics? Because there are atomic crystals in the crystals of alumina ceramics, the atomic crystals have the effect of not being afraid of alkalis and acids. Other alumina crystals, such as ionic crystals, will be converted into acid and alkali.

Grouting is actually an early molding method used for alumina ceramics. Because plaster molds are mainly used, the cost is relatively low, and it is also relatively easy to shape, even if the size and shape are more complex, it is easier to shape, but The key to grouting is the alumina slurry manufacturing equipment. Under normal circumstances, water is used as the main medium of the solvent. After that, the binder and debonding agent are added, and the exhaust is exhausted after sufficient grinding. It is poured into the plaster mold, because the capillary of the plaster mold will absorb the moisture, and the slurry will solidify in the plaster mold relatively quickly. If required, the excess material needs to be poured out, but in order to reduce the amount of shrinkage of the green body, we should try to use a relatively high-concentration slurry.

In fact, there are many types of alumina ceramics. If they are classified according to the main content of alumina, alumina ceramics can be divided into many types. Let’s learn about the characteristics and characteristics of the next several different alumina ceramics. Use it!