XTL sintryon 95 99alumina polishing china 96 alumina ceramic special part

Alumina ceramics are divided into two types: high purity type and ordinary type.

High-purity alumina ceramics are ceramic materials with an Al2O3 content of more than 99.9%. Since their sintering temperature is as high as 1650-1990°C and the transmission wavelength is 1-6 μm, they are generally made into molten glass to replace platinum crucibles; their light transmission is used It is used as sodium lamp tube due to its corrosion resistance and resistance to alkali metal corrosion; it can be used as integrated circuit substrate and high-frequency insulating material in the electronics industry.

Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the Al2O3 content. Sometimes those with an Al2O3 content of 80% or 75% are also classified as ordinary alumina ceramic series. Among them, 99 alumina porcelain is used to make high-temperature crucibles, refractory furnace tubes and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valves; 95 alumina porcelain is mainly used for corrosion-resistant and wear-resistant parts; 85 porcelain Because some talc is often incorporated into it, the electrical properties and mechanical strength are improved. It can be sealed with molybdenum, niobium, tantalum and other metals, and some are used as electronic vacuum device components.

Alumina ceramic parts Molding method：
Alumina ceramic products can be formed by dry pressing, grouting, extrusion, cold isostatic pressing, injection, casting, hot pressing and hot isostatic pressing. In recent years, molding technology methods such as filter press molding, direct solidification injection molding, gel injection molding, centrifugal grouting molding and solid free molding have been developed at home and abroad. Different product shapes, sizes, complex shapes and precision products require different molding methods.

1. Dry pressing molding: Alumina ceramic dry pressing molding technology is limited to objects with simple shapes, inner wall thickness exceeding 1 mm, and a length-to-diameter ratio of no more than 4:1. Forming methods are uniaxial or bidirectional. There are two types of presses: hydraulic and mechanical, and can be used in semi-automatic or fully automatic forming methods. The maximum pressure of the press is 200Mpa. The output can reach 15-50 pieces per minute. Since the stroke pressure of the hydraulic press is uniform, the height of the pressed parts is different when the powder filling is different. The pressure applied by a mechanical press changes depending on the amount of powder filled, which can easily lead to differences in dimensional shrinkage after sintering and affect product quality. Therefore, uniform distribution of powder particles during dry pressing is very important for mold filling. Whether the filling amount is accurate or not has a great impact on the dimensional accuracy control of manufactured alumina ceramic parts. Powder particles larger than 60 μm and between 60 and 200 mesh can achieve the maximum free flow effect and achieve the best pressure molding effect.

2. Slip casting method: Slip casting is the earliest molding method used for alumina ceramics. Due to the use of plaster molds, the cost is low and it is easy to mold large-sized and complex-shaped parts. The key to slip casting is the preparation of alumina slurry. Usually, water is used as the flux medium, and then the debonding agent and the binder are added. After sufficient grinding, the air is exhausted, and then poured into the plaster mold. Due to the adsorption of moisture by the capillaries of the gypsum mold, the slurry solidifies in the mold. During hollow grouting, when the mold wall absorbs the slurry and reaches the required thickness, the excess slurry needs to be poured out. In order to reduce the shrinkage of the green body, high-concentration slurry should be used as much as possible.

Alumina ceramic parts Firing technology：
The technical method of densifying the granular ceramic body and forming a solid material is called sintering. Sintering is a method of eliminating the cavities between particles in the green body, removing a small amount of gas and impurity organic matter, and allowing the particles to grow and combine with each other to form new substances.

The most widely used heating device for firing is an electric furnace. In addition to normal pressure sintering, which is pressureless sintering, there are also hot press sintering and hot isostatic pressing sintering. Although continuous hot-pressing sintering increases output, the cost of equipment and molds is too high. In addition, due to axial heating, the length of the product is limited. Hot isostatic pressing uses high-temperature and high-pressure gas as the pressure transmission medium, which has the advantage of uniform heating in all directions and is very suitable for sintering products with complex shapes. Due to the uniform structure, the material performance is 30 to 50% higher than that of cold press sintering. It is 10-15% higher than ordinary hot press sintering. Therefore, some high value-added alumina ceramic products or special parts required for national defense and military industries, such as ceramic bearings, reflectors, nuclear fuel, gun barrels and other products, use the hot isostatic pressing method.

Alumina ceramic parts strengthening process:

In order to strengthen alumina ceramics and significantly improve their mechanical strength, a new alumina ceramic strengthening process has been introduced abroad. The process is novel and simple. The technical method adopted is to use electron beam vacuum coating, sputtering vacuum coating or chemical vapor evaporation method to coat a layer of silicon compound film on the surface of alumina ceramics, and then heat it at 1200℃~1580℃. Processing to toughen alumina ceramics.

The mechanical strength of the strengthened alumina ceramics can be greatly increased on the original basis, and an alumina ceramic with ultra-high strength can be obtained.

FAQ

1.What is the MOQ?

No limit to the quantity. We can offer the best proposal and solutions according to your condition.

2.If products have some quality problem, how would you deal with?

We will responsible for all the quality problems.

3.What’s the delivery time ?

7 working days for standard products 30 days for customized products.

Advantages

1.Philosophy:With excellent quality, firt-class service, honest business

2.Equipment:We have complete production line and testing equipment, including automatic production line.

3.Quality:We have passed IS0 9001:2005. standard, stable,reliable

4.Group:We have our own team to research, design, produce and sell.

About XTL

Liling Xing Tai Long Special Ceramic Co., Ltd. was established in 1997, specializing in research and development, manufacturing fire assay crucible and cupel. The products are used for precious metal analysis, mining laboratory testing, mineral assaying, and gold assaying. Fire assay crucibles material is fireclay mixed with other refractory materials, they can withstand temperature up to 1300℃. They have excellent resistance against flux attack, erosion, cracking, and thermal shock. As a powerful professional manufacturer of fire assay crucible with cupel, we have 7000 square meters new factory building with the automatic production line. The company always adheres to quality survival, innovation, and development, the integrity of the brand, to protect and thoughtful after-sales service enterprises as the goal. Over the years, our products are sold well all over the country and exported to Germany, the United States, Brazil, Russia, Mexico...more than 20 countries, product quality, and service are highly praised by customers. “Superior quality, preferential price” is our management tenet. we sincerely expect to cooperate with the masses of domestic and foreign customers, common development! Welcome to visit and investigate of our company.

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