Johns Hopkins University

Michael C Brupbacher

David B Shrekenhamer

Dajie Zhang

Adrian A Podpirka

Dennis Nagle

The present invention is directed to methods for formation of refractory carbide, nitride, and boride coatings without use of a binding agent. The present invention is directed to methods of creating refractory coatings with controlled porosity. Refractory coatings can be formed from refractory metal, metal oxide, or metal/metal oxide composite refractory coating precursor of the 9 refractory metals encompassed by groups 4-6 and periods 4-6 of the periodic table; non-metallic elements (e.g. Si & B) and their oxides (i.e. SiO& BO) are also pertinent. The conversion of the refractory coating precursor to refractory carbide, nitride or boride is achieved via carburization, nitridization, or boridization in the presence of carbon-containing (e.g. CH), nitrogen containing (e.g. NH), and boron-containing (e.g. BH) gaseous species. Any known technique of applying the refractory coating precursor can be used. The porosity of resultant refractory coatings is controlled through compositional manipulation of composite refractory coating precursors.

Method for forming binder-free refractory carbide, nitride and boride coatings with a controlled porosity

Methods and systems for growing thin films via molecular-beam epitaxy (MBE) on substrates are provided. The methods and systems utilize a thermally conductive backing plate including an infrared-absorbing coating (IAC) formed, for example, on one side of the thermally conductive backing plate to provide an asymmetric emissivity that absorbs infrared radiation (IR) on the side having the IRC and does not on the non-coated side of the thermally conductive backing plate (e.g., refractive metal or alloy). The asymmetric emissivity shields the thin film being deposited on a substrate from the IR during formation.

Molecular-beam epitaxy system comprising an infrared radiation emitting heater and a thermally conductive backing plate including an infrared-absorbing coating thereon

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Catonsville, MD, United States of America

Michael C Brupbacher