The Penn State Research Foundation

Dennis Tool Company

The Pennsylvania State Research Foundation

Dennis Tool Corporation

Jiping Cheng

Rustum N Roy

Dinesh K Agrawal

Mahlon D Dennis

Qiming Zhang

Paul D Gigl

Lee Gorny

Baojin Chu

Xinyu Li

Paul D Gigil

Sheng-Guo Lu

Bret P Neese

Cooling devices (i.e., refrigerators or heat pumps) based on polymers which exhibit a temperature change upon application or removal of an electrical field or voltage, (e.g., fluoropolymers or crosslinked fluoropolymers that exhibit electrocaloric effect).

Polymer-based electrocaloric cooling devices

An apparatus ( ) for the development of transparent alumina ceramics using microwave energy at the frequency between 0.915 and 2.45 GHz inclusive in hydrogen atmosphere at ambient pressure comprises an enclosed, insulated chamber ( ) to retain a workpiece ( ) for the application of microwave energy. The chamber comprises a TE single mode or a multimode microwave cavity into which is mounted a quartz tube ( ). An insulation material ( ), transparent to microwave energy, is positioned within the quartz tube. A port ( ) for the introduction of hydrogen penetrates the cavity so that the microwave sintering of the workpiece is performed in an ultra-pure hydrogen atmosphere. The workpiece is preferably mounted on a refractory ceramic such as alumina tube for the microwave sintering process. A method, preferably using the apparatus, develops transparent alumina ceramics and single crystal sapphire.

Method and apparatus for the preparation of transparent alumina ceramics by microwave sintering

A process for sintering green powder metal, metal alloy or metal composition parts employing microwave energy is described.

Process for sintering powder metal components

Embodiments include a process including providing a microwave radiation source and a processing chamber. The process includes generating a region of pure magnetic field from the microwave radiation in the processing chamber. A region of pure electric field from the microwave radiation is also generated. A material is positioned in the region of pure magnetic field while no portion of the material is positioned in the region of pure electric field, and the material is heated in the region of pure magnetic field. The heating may be conducted to sinter the material. The material may includes a metal.

Microwave processing in pure H fields and pure E fields

The present disclosure is directed to a method of converting green particles to form finished particles. The apparatus used for sintering incorporates an elongate hollow tube, an insulative sleeve there about to define an elevated temperature zone, and a microwave generator coupled through a wave guide into a microwave cavity incorporated the tube. The particles are moved through the tube at a controlled rate to assure adequate exposure to the microwave radiation. Another form sintered a solid part in a cavity or mold.

Process and apparatus for the preparation of particulate or solid parts

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State College, PA, United States of America

Jiping Cheng