Materials & Products

The demands on kiln furnitures for high temperature loads have been ever increasing during the last years, due to progressive optimization of the application processes. Especially in the expanding segment of kiln furnitures for advanced ceramics, the requirements for application temperature, cycle time, number of firing cycles, energy consumption and general quality standards have been raised enormously. This causes the need for specific adaptations of materials and products.

At ALPHA CERAMICS we develop and optimize high quality kiln furnitures, but also materials and products for other industry applications. The products are manufactured and marketed directly by ourselves. On request the starting materials can be supplied also directly for customer´s production (on a limited scale).

Products

ALPHOXIT 82 WMA

ALPHOXIT 82 WMA is a mullite-corundum based material. Due to its optimized microstructure it shows an excellent thermal shock resistance at a service temperature up to 1600 °C. Its high resistance against chemical and oxidising influences qualifies ALPHOXID 82 WMA especially for firing of electrical ceramics, powder metallurgy products, and structural ceramics

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ALPHACORID

ALPHACORID A as well as ALPHACORID M are cordierite-mullite based materials featuring excellent thermal shock resistance and high mechanic stability. Due to the service temperature of up to 1350 °C they can be applied in the field of electrical ceramics and powder metallurgy as well as in other fields of the ceramic industry. Because of their low thermal expansion coefficient they are especially suited for fast firing of ceramic products. Due to the application of specifically high plastic clay it is possible to manufacture complex shaped products made of ALPHACORID

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ALPHACARBID 40

ALPHACARBID 40 has been developed to manufacture components featuring in particular a considerable thermal shock resistance and at the same time a high mechanic resistance. A mullite binding matrix is built up to form the continuous phase of the composite in which SiC grains are intercalated as disperse phase. The thermo-mechanical properties of both materials correspond to each other. The expansion coefficient of ≈ 4.7 x 10^-6/K is relatively low compared to conventional refractory zirconia or corundum based materials (8 x 10^-6/K)

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ALPHA-ZIRCOXID

When firing titanate based electronic components such as capacitors, resistors or piezoceramics, it is very important to avoid chemical interaction between material to be fired and kiln furniture. For this purpose ALPHA CERAMICS has developed the partly stabilized zirconia spray dried granulate ALPHA-ZIRCOXID. This material is extremely inert to chemical interactions and offers optimum conditions to sinter high quality electronic components without any problems. For this application kiln furniture made of ALPHOXIT 82 WMA with supporting plates made of ALPHA-ZIRCOXID make an excellent combination

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ALPHA-ZINKOXID

For the manufacture of varistors (overvoltage resistors) it is necessary to use kiln furniture plates which do not react in contact with the products, since this would have a negative influence on the electrical properties of the electronic components. For this special application ALPHA CERAMICS produces kiln furniture on the basis of highly pure zinc oxide. It is possible to manufacture components of different shapes up to a maximum size of 330 x 250 mm². Due to the high density of the zinc oxide (5.4 g/cm³) these products are usually combined with support boxes made of chemically resistant porous mullite / corundum material in order to reduce the weight proportion of the kiln furniture in the kiln

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ALPHOXIT 100

ALPHOXIT 100 is the result of a feasibility study for a world leading producer of electronics. The aim of the study was the development of a bright white body without firing shrinkage, allowing a surface treatment after bisque firing. This material can be applied as kiln furniture up to a temperature of 1600 °C without any problems in order to prevent the fired product from being contaminated by foreign elements. Due to the residual porosity of approx. 25 % it is possible to run a faster cooling curve when firing than usually

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ALPHA-MGO

When firing electronic components, it is most important to avoid chemical interaction between the product and the supporting kiln furniture. Due to its electrical and refractory properties, ALPHA CERAMICS’ newly developed MgO material is suitable for this application. Production trials have shown that these magnesium oxide setter plates and discs show an excellent performance, particularly in the development of electrical insulation at high temperatures (up to 1600°C!).
Such MgO setter plates will increase the quality of the product, because no diffusion into the setter plates and vice versa will occur. As another big advantage they will extend the lifetime of the supporting kiln furniture

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