Martin Marietta Corporation

Johns Hopkins University

Sermatech International Inc.

Integument Technologies, Inc.

John M Brupbacher

Leontios Christodoulou

Dennis C Nagle

William C Moshier

Morgana M Trexler

Jennifer L Sample

Dajie Zhang

Stephen L Kampe

Lisa A Kelly

Terrence G Vargo

Larry G Boxall

Timothy S Koloski

William M Buchta

Russell N Bennett

Andrew W Dalgleish

James M Patton

Scott E Vogt

Garner S Holdsworth

Alvin F Bopp

A method includes producing an article having a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.

Method of producing nanoparticle taggants for explosive precursors

An article includes a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.

Nanoparticle taggants for explosive precursors

Novel appliqu&eacute;s comprising oxyhalopolymer-adhesive composites wherein the adhesive layer of the composite is chemically bonded to reactive sites on at least one side of the oxyhalopolymer layer, possess superior peel strengths, resistance to delamination and protective properties, including protection of surfaces from lightning strike to seamless protective liners for tanks. The appliques are suitable for printing architectural designs thereon. Multilayered specialty appliqu&eacute;s can be fabricated from the above fundamental oxyhalopolymer-adhesive composite structure, including layered adhesives for encapsulating tridimensional mechanical and electrical devices, such as RF, or microwave sensitive antennae for transmitting and receiving communications, providing protection from environmental electromagnetic effects (E ), shock and impact resistance, multidimensional deformable structures; housing for temperature control systems, etc. The properties of the appliqu&eacute;s can be modified by introducing various additives to the halopolymer and/or adhesive layers to customize electrical, and optical shielding, or reflectivity, corrosion resistance, and the like.

Oxyhalopolymer protective multifunctional appliqu&eacute;s and paint replacement films

A substrate protected by a polymeric lining wherein passageways are provided between the lining and the substrate for channeling of fluids which may penetrate through the lining to the substrate surface. In one embodiment the lining is formed to provide for passages between the lining and the substrate. Mesh attached to the substrate provides for securement of the lining to the substrate by at least partial embedment of the mesh within the lining. Wire spacers are positioned between the mesh and the substrate to separate portions of the lining from the substrate surface and form passageways for channeling fluid which may penetrate the lining. In another embodiment a vessel includes a network of spacers forming a generally parallel array of passageways and at least one passageway transverse to the parallel array of passageways.

Ducting passages for a polymeric lining

A method is taught for the in-situ precipitation of ceramic materials in a metal matrix. By means of the solvent assisted reaction, metal-ceramic composites having highly superior properties may be obtained. The invention involves the reaction of the ceramic forming constituents in a metal solvent medium to provide very finely-dispersed ceramic particles in the metal matrix. Exemplary materials include titanium diboride in an aluminum matrix.

Metal-ceramic composites

Devices and methods are disclosed for contacting a hot reaction mass with water to initiate an explosive reaction. The reaction mass comprises a ceramic or intermetallic material that is produced by exothermically reacting a mixture of reactive elements. Suitable reaction masses include borides and/or carbides that are formed by reacting a mixture comprising B and/or C in combination with an element selected from Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W. Additional metals such as Al, Li, Mg, Zn, Cu, Be, Na, K, Ca, Rb, Y, U and Cs may also be present in the reactive mixture. In operation, the hot reaction mass is contacted with water to initiate an explosive water reaction and to produce large volumes of hydrogen containing gas.

Water reactive method with delayed explosion

An arc-melting method is taught for the formation of metallic-second phase composite materials. The method involves the formation of an intermediate composite material comprising a relatively high loading of second phase particles dispersed in a metal matrix. This intermediate material is then combined with an additional amount of metal and arc-melted to form a final composite comprising a lower loading of the second phase particles dispersed in a final metallic matrix. The final metallic matrix may be comprised of a metal, metal alloy, or intermetallic, while the second phase particles may comprise ceramic materials such as borides, carbides, nitrides, silicides, oxides or sulfides.

Arc-melting process for forming metallic-second phase composites

The present invention relates to the formation of whisker reinforced metal matrix composites in which complex boride or carbide whiskers having an aspect ratio of greater than 10:1 are distributed throughout a metal, metal alloy, or intermetallic matrix. Exemplary complex boride whiskers include TiNbB, TiTaB, TiVB, NbHfB, and TiNbMoB. Exemplary complex carbide whiskers include TiNbC, TiVC, TiZrC, TiHfC, and TiTaC. A method for the in-situ formation of complex boride and complex carbide whiskers within metallic matrices is disclosed which involves reacting a mixture of individual complex ceramic-forming constituents in the presence of a metal to precipitate the desired complex ceramic whiskers in a metal matrix.

Metal-ceramic composites containing complex ceramic whiskers

This invention relates to a rapidly solidified product comprising a second phase in both a stable particulate form and a metastable flake form dispersed in an intermetallic matrix.

Rapidly solidified intermetallic-second phase composites

A method is taught for the in-situ precipitation of second phase materials, such as ceramic or intermetallic particles, in a substantial volume fraction of solvent metal matrix. The invention involves the propagating reaction of the second phase-forming constituents in a solvent metal medium to provide a porous composite of finely-dispersed second phase particles in the metal matrix. Exemplary materials include titanium carbide or titanium diboride in an aluminum matrix.

Process for forming porous metal-second phase composites

The present invention relates to a process for the production of fine powder materials and the products of that process. The process involves the in-situ precipitation of second phase particles, such as ceramic or intermetalics, within a metal matrix, followed by separation of the particles from the matrix to yield a powder comprising the second phase particles. Particles formed by this process are typically in the size range of 0.01 to 10 microns and have controlled morphology, narrow size distribution, well defined stoichiometery and relatively high purity. Exemplary of second phase particles formed by this process are metal borides, carbides, nitrides, oxides, silicides and beryllides, including TiB.sub.2, ZrB.sub.2, VB.sub.2, MoB.sub.2, TiC, WC, VC, TiN, ZrSi.sub.2, MoSi.sub.2, Ti.sub.5 Si.sub.3, and TiBe.sub.12.

Process for forming fine ceramic powders

Porous metal-second phase composites

The present invention relates to the formation of whisker reinforced metal matrix composites in which complex boride or carbide whiskers are distributed throughout a metal, metal alloy, or intermetallic matrix. Exemplary complex boride whiskers include TiNbB, TiTaB, TiVB, NbHfB, and TiNbMoB. Exemplary complex carbide whiskers include TiNbC, TiVC, TiZrC, TiHfC, and TiTaC. A method for the in-situ formation of complex boride and complex carbide whiskers within metallic matrices is disclosed which involves reacting a mixture of individual complex ceramic-forming constituents in the presence of a metal to precipitate the desired complex ceramic whiskers in a metal matrix.

Complex ceramic whisker formation in metal-ceramic composites

This invention relates to a composite material comprising an in-situ precipitated second phase in an intermetallic matrix, and to the process for making such a composite.

Composites having an intermetallic containing matrix

A method is taught for the introduction of in-situ precipitated second phase materials, such as ceramic or intermetallic particles in a metal matrix, to a host metal. When an initial solvent-assisted reaction is utilized, metal-second phase composites having highly superior properties may be obtained. The invention may utilize the reaction of the second phase-forming constituents in a solvent metal medium to provide an intermediate material of finely-dispersed second phase particles in an intermediate metal matrix, in the form of a porous mass or sponge. Any desired loading of second phase in the final composite may be achieved by the admixture of this preformed intermediate material having a relatively high content of particulate material, with a molten host metal. Exemplary materials include titanium diboride in an aluminum matrix and titanium carbide in an aluminum matrix.

Growing community of inventors

Baltimore, MD, United States of America

John M Brupbacher