Abstract:
A ceramic heater such that the remaining heat of the heating body can be cooled in a forced way, the resistance of the heating body can be easily controlled, and no cracks are produced when the ambient temperature lowers below a set value or when the temperature sharply rises or falls. The ceramic heater having a resistance heating body provided on a ceramic substrate is characterized in that the periphery of a resistance heating body forming area is within 35 mm from the edge of the ceramic substrate.
Abstract:
A shock-resistant refractory ceramic heater is provided. In producing a ceramic substrate (12), a green sheet made of slurry containing ceramic powder is provided with heater elements (14a, 14b) on its surfaces. The green sheet is sandwiched between other green sheets and sintered. The surface level (P1a) of the heater elements (14a) is deviated vertically from the surface level (P1b) of the heater elements (14b).
Abstract:
A ceramic heater capable of heating a heated object therearound to a uniform temperature because the heater has a sufficient heating value and the temperature of the heater in circumferential direction is uniform, comprising a resistance heating element buried between a core material formed of ceramic and an insulating layer formed of ceramic wrapping the core material, characterized in that a heating part of the resistance heating element forms a repeated pattern in circumferential direction with axial components in parallel with an axial direction and circumferential components perpendicular to an axial direction connected in order to each other at end parts, and the length of the axial components is equal to or longer than the length of the circumferential components and the axial components are arranged generally at equal intervals in circumferential direction.
Abstract:
The invention provides a ceramic heater capable of making uniform the temperature of a workpiece such as a silicon wafer, preventing damage to the silicon wafer, and recovering a set temperature in a short time if an unexpected temperature change occurs. The ceramic heater includes a heater formed on or under the surface of a ceramic substrate, temperature-measuring means for measuring the temperature of the ceramic substrate or an object to be heated, a controller for supplying electric power to the heater, a storage for storing the temperature data measured by the temperature-measuring means, and a processor for determining the electric power required for the heater based on the temperature data. The heater is divided into two or more circuits, which are supplied with different quantities of electric power.
Abstract:
A support assembly for use in semiconductor processing includes an application substrate, a heater layer disposed directly onto the application substrate, an insulation layer disposed onto the heater layer, and a second substrate disposed onto the insulation layer. The heater layer is directly disposed onto the application substrate by a layered process such that the heater layer is in direct contact with the application substrate. The application substrate defines a material having a relatively low coefficient of thermal expansion that is matched to a coefficient of thermal expansion of the heater layer.
Abstract:
Electrical resistance heater and heater assemblies are described. According to one embodiment, the heater comprises a sinusoidal heating element that provides substantially constant heating. According to another embodiment, the heater comprises a heating element and one or more press-fit coupled electrical adapters. Methods and systems are also disclosed.
Abstract:
A wafer processing device or apparatus, i.e., a heater or an electrostatic chuck, comprises a planar support platen, a support shaft having centrally located bore, and a pair of electrical conductors located in the shaft. In one embodiment, the electrical conductors are concentrically located within the bore of the shaft, with the first electrical lead being in the form of a pyrolytic graphite rod and separated from the outer second graphite electrical lead by means of a pyrolytic boron nitride (pBN) coating. In a second embodiment, the support platen and the support shaft are formed from a single unitary body of graphite. In yet another embodiment of the device of the invention, the connection posts comprise a carbon fiber composite and the exposed ends of the electrical connectors are coated with a protective ceramic paste for extended life in operations.