초록 ▼

A composition having nanoparticles of a refractory-metal boride and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising a metal component, boron, and an organic component. The metal component is nanoparticles or particles of a refractory metal or a refract

A composition having nanoparticles of a refractory-metal boride and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising a metal component, boron, and an organic component. The metal component is nanoparticles or particles of a refractory metal or a refractory-metal compound capable of decomposing into refractory metal nanoparticles. The organic component is an organic compound having a char yield of at least 60% by weight or a thermoset made from the organic compound. A method of combining particles of a refractory metal or a refractory-metal compound capable of reacting or decomposing into refractory-metal nanoparticles, boron, and an organic compound having a char yield of at least 60% by weight to form a precursor mixture. A composition having nanoparticles of a refractory-metal boride that is not in the form of a powder.

대표청구항 ▼

1. A composition comprising: a metal component selected from: nanoparticles or particles of a refractory metal; anda refractory-metal compound capable of decomposing into refractory-metal particles;elemental boron; andan organic component selected from: an organic compound having a char yield of at

1. A composition comprising: a metal component selected from: nanoparticles or particles of a refractory metal; anda refractory-metal compound capable of decomposing into refractory-metal particles;elemental boron; andan organic component selected from: an organic compound having a char yield of at least 60% by weight; anda thermoset made from the organic compound. 2. The composition of claim 1, wherein the refractory metal is titanium. 3. The composition of claim 1, wherein the refractory metal is a group IV-VI transition metal. 4. The composition of claim 1, wherein the metal component is a salt of the refractory metal, a hydride of the refractory metal, a carbonyl compound of the refractory metal, a halide of the refractory metal, or particles of the refractory metal. 5. The composition of claim 1, wherein the organic compound: contains only carbon and hydrogen;contains aromatic and acetylene groups;contains only carbon, hydrogen, and nitrogen or oxygen;contains no oxygen; orcontains a heteroatom other than oxygen. 6. The composition of claim 1, wherein the organic compound is 1,2,4,5-tetrakis(phenylethynyl)benzene or a prepolymer thereof, 4,4′-diethynylbiphenyl, N, N′-(1,4-phenylenedimethylidyne)-bis-(3-ethynylaniline), dianilphthalonitrile, or resorcinol phthalonitrile or a prepolymer thereof. 7. The composition of claim 1, wherein the metal component and the organic component are the same compound. 8. The composition of claim 1, wherein the boron and the refractory-metal compound or particles of refractory metal are dispersed in the thermoset. 9. The composition of claim 1, wherein the composition comprises fibers. 10. The composition of claim 1, wherein the refractory metal is zirconium, hafnium, tungsten, niobium, molybdenum, chromium, tantalum, or vanadium. 11. The composition of claim 1, wherein the metal component is tungsten powder, tantalum powder, titanium hydride, zirconium hydride, or hafnium hydride. 12. The composition of claim 1, wherein the composition comprises carbon fibers, ceramic fibers, or metal fibers.