Heating – Work feeding – agitating – discharging or conveying... – Removable furnace bottom section or kiln cart
Patent
1995-01-27
1997-04-01
Bennett, Henry A.
Heating
Work feeding, agitating, discharging or conveying...
Removable furnace bottom section or kiln cart
432 5, 432 14, 432120, 432239, F27D 312
Patent
active
056160240
ABSTRACT:
A ceramic heater composed of a ceramic substrate and a resistant heating element embedded within the ceramic substrate along a predetermined planar pattern is obtained by holding a convolution of a spiral-coiled high melting metallic filament in the above predetermined planar pattern and heat-treating the convolution at a temperature not higher than a primary recrystallization commencement temperature of the high melting metal under a non-oxidative atmosphere to provide the resistant heating element, embedding the resulting resistant heating element within a ceramic shaped body, and then, sintering the ceramic shaped body. In a preferred embodiment, the resistant heating element is a convolution of a spiral coil, the number of coils per a unit length of said convolution is set at a predetermined value in each of defined domains of the ceramic heater, and when the number of coils per a unit length of the convolution is determined, the relation of the maximal value, the minimal value and the mean value, of all the determined numbers of coils in the above domains, satisfies the formula:
Murasato Masahiro
Niiori Yusuke
Nobori Kazuhiro
Sakon Atsushi
Umemoto Koichi
Bennett Henry A.
NGK Insulators Ltd.
Ohri Siddharth
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