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[January 2001]
Machinable ceramic now availabale as a zirconia phosphate
AremcoloxTM 502-1550, a new low expansion zirconia phosphate machinable ceramic manufactured by Aremco Products Inc (Valley Cottage, NY, USA) is now used to produce high temperature fixtures and insulators for use in brazing, heat treating, optical and semiconductor applications to 1550°C.
The product is described as a highly unusual composition due its low coefficient of thermal expansion (CTE) of 0.5in/in/°F x 10-6. This feature is said to set it apart from conventional ceramics such as alumina and zirconia which demonstrate CTEs as high as 4.0ppm/°F. A low CTE ensures that as a part experiences thermal shock, the mechanical stress caused by its expansion and contraction does not cause the part to crack.
The product is available in both low (60%-70%) and medium (70%-80%) density compositions. Both forms are said to exhibit good mechanical strength and electrical and thermal insulation; with a compressive strength of greater than 25,000psi, dielectric strength of 80V/mil and thermal conductivity of 5.3Btu-in/hr-ft2-oF.
502-1550 is completely inert, will not outgas in ultra high vacuum and does not react with most molten metals, salts and acids.
It is typically machined using carbide or diamond tooling and no post firing is required. It is available in rods from 0.5 inch to 2.5 inch diameter and plates from 0.25 inch to 1.0 inch thick. Custom sizes and parts are also produced.
Web site: http://www.aremco.com/
ENDS