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Thermansys is producing a broad range of analytical grade, dense Fully stabilized Zirconia crucibles in various sizes and
forms with max operating temperature 1800˚C
Fully Yttria Stabilized Zirconia (8YSZ, 8% by mole Yttria) ceramics are used when an application requires a crucible that is exceptionally strong, wear-resistant, and chemically inert even at extremely high temperatures. It is also the preferred material for biocompatible applications and is the strongest among the materials we offer. 8YSZ exhibits a flexural strength higher than nitrides and comparable to carbides, significantly extending the reliability and lifespan of crucibles made with stabilized zirconia.
Fully Stabilized Zirconia crucibles are highly sensitive to thermal shock.
Heat up: Warm up the furnace chamber gradually. A maximum heating rate of 5°C per minute is recommended but special precaution should be given for two temperature ranges where the heat up rate should be retained to 3°C per minute. The first “sensitive” temperature range is between 100-300 °C (especially in the presence of water molecules) and the second is between 1100-1250 °C. During these two temperature ranges it is strongly recommended to use a maximum heat up rate of 3°C per minute.
Cool down: Lower the temperature as gradually as possible. Recommended cooling down rate is more severe than corresponding heating rate and should be retained below 5 °C per minute. It is better to remove the crucibles from the hot zone only if the temperature drops below 100 °C. When taking the crucibles out of furnace and bring them into room temperature to pour the melted material try to make the process as gradual as possible. A better practice is after pouring the melted metal to restore the crucible back into the furnace and leave it cool down inside the furnace.
Fully Stabilized Zirconia can be used at high temperature under oxidizing (air), reduced, or inert (Nitrogen, Argon) conditions with no restriction. It is stable chemically in contact with acidic or metal fusions and has been used for containers for melting fused silica. It is not easily reduced except that it may form a carbide when in contact with carbon at 1800 to 1900°C in an inert atmosphere and at 1500°C in a vacuum. It is highly corrosion resistant against molten metals such Fe, Ni, Bi, Pt, Mo, Hf, V, Pu but attacked by Na, K, Be, Li, Si, Ti and Zr.
Fully Stabilized Zirconia crucibles have very good chemical resistance against diluted or concentrated Acids with the exception of HF. Fully Stabilized Zirconia is insoluble in water and has negligible solubility in HCl and HNO3. It is however soluble in concentrated boiling H2SO4 and alkali hydroxides. The low chemical solubility of YSZ ceramics components makes them highly resistant to chemical corrosion. The almost zero porosity and excellent smoothness of Thermansys crucibles surface prevents chemical attack.
Chemical erosion of ceramic materials is not easy to be measured and determined in a way that will lead to accurate and represented scientific data for all shapes and sizes.
Our ceramic materials, as they are delivered, do not contain substances dangerous to health, or create them during use. They are produced using natural inert raw materials. Any organic binder or other substances used during manufacturing are burned through production firing. Thermansys however cannot guarantee that ceramic crucibles exposed to conditions that could produce residual material or create material transformations retain their health and safety properties upon reuse.
The product at its final delivery form is fully dense and do not produce dust during normal handling and operation. However, if the customer desires to proceed with further product processes like cutting or drilling inert dust might be created. Workers therefor should be provided with suitable dust protection equipment.
Thermanys, a leading technology firm, is relied upon by prestigious technical universities, research centers, and private high-tech laboratories. Our objective is to develop exceptionally reliable and cutting-edge products, prioritizing user ease-of-use as a central strategy.
Thermanys, a leading technology firm, is relied upon by prestigious technical universities, research centers, and private high-tech laboratories. Our objective is to develop exceptionally reliable and cutting-edge products, prioritizing user ease-of-use as a central strategy.
