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Machinable ZTA

Zirconia Toughened Alumina (ZTA) is essentially much similar material with Alumina. Their difference lies to the addition of a specific blend of Zirconia to the main Alumina matrix before sintering. The main advantages of Zirconia Toughened Alumina (ZTA) are that provides additional strength and toughness over Alumina for temperatures below 1500 C, and has fairly improved thermal shock resistance. Thermansys t-ceramics ZTA machinable forms are offered without significant additional cost compared to pure Alumina.
Thermansys t-ceramics machinable ZTA after full firing to 1600°C will became a totally dense material with all mechanical, chemical and electrical properties of commercial available ZTA.
Firing – Shrinkage: For full firing raise the temperature to 1100°C with a heating rate of 4°C/min and then to 1600°C with 2°C/min. Soak at this temperature for 6 to 12 hours. Cool down the furnace gradually with a rate of 5°C/min. The thicker the parts sections the longer the soak time. Typically for wall thickness 4-8mm 6 hours soaking time will be enough.  Parts with cross sectional thickness higher than 25mm will need 12 hours soaking time. A shrinkage of 18-19% must be expected. An almost proportionally lower degree of shrinkage should be expected with lower soaking temperature.
 
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