摘要:
A method of making a carbon-carbon composite part may comprise fabricating a fibrous preform comprising a fiber volume ratio of 25% or greater, heat treating the fibrous preform at a first temperature, infiltrating the fibrous preform with a first ceramic suspension, densifying the fibrous preform by chemical vapor infiltration (CVI) to form a densified fibrous preform, and heat treating the densified fibrous preform at a second temperature of 1600° C. or greater.
摘要:
A method for making a composite material includes disposing a quantity of liquid comprising at least 90 weight percent molten boron within pores of a porous preform, the preform comprising a preform material; and reacting at least a portion of the molten boron with a portion of the preform material to form a solid ceramic reaction product, thereby forming a ceramic matrix composite material. An article comprises a composite material; the composite material comprises a fibrous phase disposed within a matrix. The matrix comprises silicon carbide, boron carbide, and boron silicide.
摘要:
A polycrystalline diamond compact useful for wear, cutting, drilling, drawing and like applications is provided with a first diamond region remote from the working surface which has a metallic catalyzing material and a second diamond region adjacent to or including the working surface containing a non-metallic catalyst and the method of making such a compact is provided. This compact is particularly useful in high temperature operations, such as hard rock drilling because of the improved thermal stability at the working surface.
摘要:
A composition having nanoparticles of a boron carbide and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising boron and an organic component. 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 boron and an organic compound having a char yield of at least 60% by weight, and heating to form boron carbide or boron nitride nanoparticles.
摘要:
A pre-impregnated composite tape is provided that includes: a matrix material; a plurality of fibers forming unidirectional arrays of tows encased within the matrix material; and a plurality of filler particles dispersed between adjacent fibers in the tape. The fibers have a mean fiber diameter of about 5 microns and about 40 microns, and are included within the tape at a volume fraction of about 15% and about 40%. The plurality of filler particles have a log-normal volumetric median particle size, such that the tape has a ratio of the log-normal volumetric median particle size to the mean fiber diameter that is about 0.05:1 to about 1:1. A method is also provided for forming a ceramic matrix composite.
摘要:
To provide a lead-free piezoelectric material having a high and stable piezoelectric constant in a wide operating temperature range. The piezoelectric material contains a perovskite type metal oxide having the general formula (1), Mn, Mg, (Ba1-xCax)a(Ti1-y-zSnyZrz)O3 (1) (wherein x is in the range of 0.050≦x≦0.200, y is in the range of 0.010≦y≦0.040, and z is in the range of 0≦z≦0.040, provided that x≧0.375(y+z)+0.050, and a is in the range of 0.9925+b≦a≦1.0025+b) wherein the amount b (mol) of Mn on a metal basis per mole of the metal oxide is in the range of 0.0048≦b≦0.0400, and the Mg content on a metal basis per 100 parts by weight of the metal oxide is 0.100 parts by weight or less.
摘要:
A carbon composite contains a plurality of expanded graphite particles; and a second phase comprising a carbide, a carbonization product of a polymer, or a combination thereof; wherein the second phase bonds at least two adjacent basal planes of the same expanded graphite particle together. Methods of making the carbon composite and articles comprising the carbon composite are also disclosed.
摘要:
Methods for fabricating a ceramic matrix composite are disclosed. A fiber preform may be placed in a mold. An aqueous solution may be added to the fiber preform. The aqueous solution may include water, carbon nanotubes, and a binder. The preform may be frozen. Freezing the preform may cause the water to expand and separate fibers in the fiber preform. The carbon nanotubes may bond to the fibers. The preform may be freeze dried to remove the water. The preform may then be processed according to standard CMC process.
摘要:
A method of making a polycrystalline diamond cutter element includes forming a blend, comprising a first particle size of polycrystalline diamond particles and a second particle size of polycrystalline diamond particles; forming a suspension of nanocrystalline diamond particles suspended in a solvent; and mixing the blend into the suspension to form a polycrystalline diamond mixture comprising nanocrystalline diamond coated polycrystalline diamond particles. The mixture is sintered with a substrate at high temperature and high pressure to form the polycrystalline diamond cutter element.