摘要:
A particulate composite ceramic material may include: particles of at least one first ultra-high-temperature ceramic “UHTC,” the outer surface of the particles being at least partially covered by a porous layer made of at least one second UHTC in amorphous form; and the particles defining a space therebetween; optionally, porous clusters of the at least one second ultra-high-temperature ceramic in amorphous form, distributed in said space; a dense matrix and at least one third UHTC in crystallized form at least partially filling the space; optionally, a dense coating made of at least the third UHTC in crystallized form, covering the outer surface of the matrix, the matrix and the coating representing 5% to 90% by mass with respect to the total mass of the material. A part may include such a particulate ceramic composite material.
摘要:
A silicide-based composite material is disclosed, comprising a silicide of Mo, B, W, Nb, Ta, Ti, Cr, Co, Y, or a combination thereof, Si3N4, and at least an oxide, as well as and a process for producing the same.
摘要:
A ceramic matrix composite component for use in a gas turbine engine and method for making the same are described herein. The component includes a body and an outer region. The body includes a silicon containing ceramic composite. The outer region is on an outer surface of the body.
摘要:
An article includes a substrate, a substantially hermetic sealing layer disposed on the substrate, and a porous transition layer disposed on the substrate between the sealing layer and the substrate. The article also includes one or more openings extending through the substrate to the porous transition layer.
摘要:
A composite includes a porous matrix that includes a molybdenum-silicon-boron (Mo—Si—B) alloy that has a plurality of pores with a lubricant in contact with the Mo—Si—B alloy, a hydrophobic compound in contact with the Mo—Si—B alloy, or a combination thereof. A method for preparing a porous composite includes disposing a porous matrix comprising a Mo—Si—B alloy on a substrate, the Mo—Si—B alloy comprising a plurality of pores; disposing a lubricant on a surface of the porous matrix; and disposing a hydrophobic compound on a surface of the porous matrix to form the porous composite.
摘要:
To obtain a ceramic fiber-reinforced composite material, by melt-infiltrating a composite material substrate obtained by forming ceramic fibers into a composite with a matrix formed of an inorganic substance, with an alloy having a composition that is constituted by a disilicate of at least one or more transition metal among transition metals that belong to Group 3A, Group 4A or Group 5A of the Periodic Table and silicon as the remainder, and having the silicon content ratio of 66.7 at % or more.
摘要:
A bond layer may be applied to the substrate of an article and a first layer may be applied to the bond layer by thermal spray. A second layer may be applied above the first layer by slurry coating.
摘要:
Slurry and tape compositions and processes for producing CMC articles. The slurry composition contains particles of a precursor that converts to a ceramic material when heated to a firing temperature, at least one binder that is capable of adhering the particles of the ceramic precursor together to form a pliable prepreg tape, at least one liquid plasticizer, and a solvent in which the binder is dissolved. The solvent is sufficiently volatile to evaporate from the slurry composition during forming of the tape so that the tape contains less than ten weight percent of the solvent, yet the tape is also pliable as a result of the slurry composition containing a sufficient amount of the liquid plasticizer
摘要:
A molybdenum silicide type-heating element and a method of manufacturing a heating element of the molybdenum silicide type. The heating element contains substantially Mo(Si1-x Alx)2 and Al2O3 and is prepared by mixing a molybdenum aluminum silicide-type material Mo(Si1-yAly)2 with SiO2, wherein the SiO2 has a purity of at least 98%.