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Thermansys is producing a broad range of analytical grade, crystallized, dense Zirconia
Toughened Alumina crucibles in various sizes and forms with max operating temperature 1600˚C
Zirconia Toughened Alumina (ZTA) is a composite ceramic with excellent mechanical properties and a very attractive performance to price ratio. It is produced by the addition of Zirconia to the main Alumina matrix before sintering. The main advantages of Zirconia Toughened Alumina (ZTA) over Alumina are that provides additional strength, fracture toughness, elasticity, hardness, and wear resistance for temperatures below 1500 C, and has fairly improved thermal shock resistance.
Compared to Alumina:
for temperatures below 1500C
Recrystallized Alumina crucibles have moderate sensitivity to thermal shock.
Heat up: Warm up the furnace chamber gradually. Heating rate of 4-6 °C per minute is recommended for the first 1-2 hours
to reduce the impact of thermal shock. Maximum recommended heating rate 10 °C per minute.
Cool down: Lower the temperature as gradually as possible. Recommended cooling down rate should be retained below 10°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 thefurnace and leave it cool down inside the furnace.
Zirconia Toughened Alumina (ZTA) crucibles can be used at high temperature under oxidizing (air), reduced, or inert (Nitrogen, Argon) conditions with no restriction. Can also be used under vacuum conditions.
Zirconia Toughened Alumina crucibles have very good chemical resistance against diluted or concentrated Acids (with the exception of hydrofluoric acid and phosphoric acid), Alkalis, Melted Metals and Halogens. Like Alumina, ZTA is insoluble in water and has negligible solubility in strong acid and alkaline solutions. The low chemical solubility of ZTA ceramics components makes them highly resistant to chemical corrosion. The almost zero porosity and excellent smoothness of Thermansys crucibles surface prevents chemical attack. Generally, Zirconia Toughened Alumina crucibles have similar behavior with Alumina concerning chemical compatibility. It should be noted however that ZTA can, like the Yttria Stabilized Zirconia, be vulnerable to chemisorption in the presence of water molecules but this effect is much reduced compared with YSZ. However use in moist environments at temperatures above 250C also must be carefully considered.
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.
