305 results about "Sic fiber" patented technology

The invention discloses a high-entropy alloy silicon carbide nanofiber composite material and a preparation method and application thereof, a high-entropy alloy is loaded on silicon carbide nanofibers, compared with a carbon fiber material carrier, SiC fibers can form a compact SiO2 protective layer in a high-temperature aerobic environment, further oxidation failure of the internal structure can be prevented, and the high-entropy alloy silicon carbide nanofiber composite material is prepared. And meanwhile, SiC also has relatively high high-temperature stability and weather resistance, so that the high-entropy alloy silicon carbide nanofiber composite material can stably work in an extreme high-temperature oxidation environment (such as a spacecraft thermal protection system and an engine tail gas pipeline) of over 1000 DEG C, and perfectly adapts to a high-temperature wave-absorbing scene.

The invention belongs to the technical field of radar stealth materials and high-temperature electromagnetic protection, and particularly relates to design and a preparation method of a high-temperature-resistant wave-absorbing material based on alumina fibers. According to the material, a high-temperature-resistant ceramic precursor serves as a base body, a reinforcing phase is formed by alternately stacking alumina fiber cloth and an alumina fiber web tire containing chopped silicon carbide fibers, and a three-dimensional reinforcing structure is formed through a needling technology; the chopped silicon carbide fibers are directionally distributed in the net tire in a non-uniform mode, an enhanced area array with the local geometric regular pattern is constructed, the size and the arrangement period change in a gradient mode in the thickness direction, a vertical dielectric gradient structure is formed in the material, and multi-path propagation, reflection and polarization loss of electromagnetic waves are improved; the surface of alumina fiber cloth is coated with a ceramic interface layer, so that the interface bonding strength and thermal stability are improved; the ceramic matrix is densified for multiple rounds, so that the structure is compact; the material has excellent electromagnetic absorption performance, heat resistance and mechanical strength, and is suitable for high-temperature electromagnetic environments such as aerospace, missile bay sections and the like.

The invention relates to the field of composite material ultrathin laminated plates, in particular to a preparation method of a SiC fiber reinforced Ti-based composite material ultrathin laminated plate. The method comprises the following steps: plating Ti alloy on the surface of SiC fiber by using a physical vapor deposition method; the titanium alloy foil is subjected to acid pickling to remove a surface oxide layer and impurities; the plated fibers are tightly arranged to form a SiCf / Ti alloy plate, the upper surface and the lower surface of the SiCf / Ti alloy plate are bonded to a titanium alloy foil through an adhesive, and a foil-plate-foil prefabricated body is manufactured; sealing the periphery of the prefabricated body, covering gaskets on the upper surface and the lower surface of the prefabricated body, removing the adhesive from the prefabricated body, and placing the prefabricated body in a vacuum hot-pressing mold; and a hot-pressing process is adopted to realize densification composite molding of the laminated plate. According to the method, uniform distribution of SiC fibers is achieved, the mechanical property of the material is effectively improved, the surface flatness is good after the laminated plate is prepared, and the method is suitable for weight reduction application of aerospace structural parts such as skins and reinforcing ribs.

The invention belongs to the field of continuous SiC fiber reinforced metal matrix composite materials, and particularly relates to a SiCf / TiMoNb-Ti2AlNb / Ti2AlNb laminated composite material and a preparation method of the SiCf / TiMoNb-Ti2AlNb laminated composite material. The composite material is of a hot isostatic pressing composite structure of a precursor wire and a Ti2AlNb sheath outside the precursor wire, the precursor wire is formed by uniformly distributing SiC fibers in a TiMoNb-Ti2AlNb laminated alloy matrix, the volume fraction of the SiC fibers accounts for 40-55% of the total volume fraction of the SiCf / TiMoNb-Ti2AlNb / Ti2AlNb laminated composite material, and the composite material is good in combination, compact and free of holes. Through the introduction of the TiMoNb-Ti2AlNb lamination layer, the composite material can be compact under a relatively low hot isostatic pressure parameter, and the effect of improving the performance can be achieved after process parameters are optimized.

The invention discloses a preparation method of a toughening environmental barrier coating, and relates to a preparation method of a coating. The invention aims to solve the problem of poor fracture toughness of the existing environmental barrier coating. The method comprises the following steps: 1, pretreating a base material; 2, preparing a bonding layer; and 3, preparing the environmental barrier layer. The high-melting-point metal silicide prepared on the surface of the base material or the bonding layer compounded by the high-melting-point metal silicide and the rare earth silicate has excellent temperature resistance and good interface bonding strength, and due to the addition of the rare earth silicate, the expansion coefficient of the bonding layer is highly matched with that of the base material; according to the prepared yttrium oxide stabilized zirconia fiber, mullite fiber or silicon carbide fiber reinforced rare earth silicate environmental barrier layer, the fracture toughness of pure Yb2SiO5 is improved to 6.5 MPa.m < 1 / 2 >-8.0 MPa.m < 1 / 2 > from about 1.85 MPa.m < 1 / 2 >. The strengthening and toughening environmental barrier coating prepared by the invention has very important significance on development of thermal protection coatings of hot end parts of aircrafts with high thrust-weight ratios in China.

The invention discloses a preparation method of a high-temperature-resistant wave-absorbing honeycomb sandwich structure in the technical field of wave-absorbing materials, which comprises the following steps: synthesizing a transition metal modified polycarbosilane precursor under the protection of inert gas, and performing high-temperature cracking to obtain a magnetic silicon carbide wave-absorbing agent; blending and grinding the wave-absorbing agent and high-temperature-resistant resin to prepare a wave-absorbing glue solution; after a honeycomb core material is formed by adopting inorganic fiber cloth, a wave-absorbing glue solution is loaded through a repeated dipping-drying process, and the high-temperature-resistant wave-absorbing honeycomb is obtained through gradient heat treatment. And finally, compounding and curing with the wave-transparent skin and the carbon fiber composite material through a high-temperature-resistant adhesive film. The sandwich structure is prepared on the basis of the composite material, and the magnetic silicon carbide wave-absorbing agent has the characteristics of high temperature resistance, low density, oxidation resistance and adjustable dielectric property; the phthalocyanine resin matrix is adopted, so that excellent formability and high-temperature stability are guaranteed; honeycomb nodes are sewn and reinforced by silicon carbide fibers, so that the problem of node cracking in a high-temperature environment is solved.

The invention relates to a modified silicon carbide fiber and a preparation method and application thereof, the modified silicon carbide fiber endows magnetic loss, and combines high strength and corrosion resistance of a geopolymer matrix to realize double improvement of mechanical properties and wave absorbing efficiency of concrete. Carbon fibers in conventional wave-absorbing concrete are replaced by modified silicon carbide fibers, so that on one hand, the wave-absorbing concrete has good oxidation resistance at high temperature, carbon emission is greatly reduced, and the wave-absorbing concrete has the advantages of energy conservation and environmental protection; and on the other hand, the defect that the performance is reduced at high temperature is overcome, and the modified silicon carbide fiber enables the magnetic loss of metal and the dielectric loss of a matrix to form a synergistic effect, so that the wave absorbing performance is greatly improved. The invention is suitable for green communication infrastructures, and has the characteristics of environmental protection, high durability and broadband wave absorption.

The invention provides a silicon carbide fiber-copper composite bonding wire and a preparation method thereof, and relates to the technical field of electronic materials. The preparation method of the silicon carbide fiber-copper composite bonding wire comprises the following steps: pre-plating copper on the surface of silicon carbide fiber to obtain copper-coated silicon carbide fiber; laying copper-coated silicon carbide fibers to obtain a copper-coated silicon carbide fiber layer, then constructing a copper alloy layer on the copper-coated silicon carbide fiber layer by using composite copper powder, then arranging the copper-coated silicon carbide fiber layer on the surface of the copper alloy layer again, and repeating the operation to obtain a composite wire blank in which the copper-coated silicon carbide fiber layers and the copper alloy layers are alternately arranged; and sequentially carrying out hot isostatic pressing treatment, drawing and aging treatment on the composite wire blank to obtain the silicon carbide fiber-copper composite bonding wire. The copper powder further comprises Ag, Hf and Sc, the metal elements can form fine and dispersed second-phase particles in the preparation process, and the strength of the copper bonding wire is remarkably improved through a precipitation strengthening mechanism.

The utility model discloses a high-performance high-temperature-resistant oil-stain-resistant anti-interference medium-voltage power cable, and the power cable comprises a cable core which is formed by twisting a plurality of insulated shielding wire cores. A gap of the cable core is filled with thermoplastic polyurethane elastomer rubber; the cable core is wrapped by a superconducting silicon carbide fiber tape shielding wrapping layer, and the superconducting silicon carbide fiber tape shielding wrapping layer is wrapped by an LCP high-molecular liquid crystal polymer high-temperature-resistant fireproof layer in an extruded mode. A graphene aerogel layer is extruded outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer, a polysulfonamide fiber braid layer is lapped outside the graphene aerogel layer, a polyphenylene sulfide fiber tape is coated outside the polysulfonamide fiber braid layer through a semi-conductive adhesive, an armor layer is arranged outside the polyphenylene sulfide fiber tape, and the armor layer is wrapped outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer. And a hydrogenated butadiene-acrylonitrile rubber outer sheath is extruded outside the armor layer. According to the utility model, normal operation of a line can be ensured in a complex and severe environment for a long time, and the service life of the cable is greatly prolonged.

The invention provides a high-strength winding thin-wall SiC composite cladding tube and a preparation method thereof. A preparation method of a high-strength winding thin-wall SiC composite cladding tube comprises the steps that silicon carbide fibers are wound and laid around a core mold, the winding pre-tightening force is smaller than or equal to 10 N. The winding mode comprises the first mode that one layer of annular winding is conducted firstly, then one layer of spiral winding is conducted, and the number of fiber intersection points in the whole annular direction at a certain position of the outer surface of the core mold is 1. One-layer annular winding is carried out firstly, then two-layer spiral winding is carried out, the number of fiber intersection points in the whole annular direction at a certain position of the outer surface of the core mold is 3, and a prefabricated body is obtained; carrying out a densification deposition process on the preform, wherein the densification deposition process comprises PyC pyrolytic carbon interface deposition, CVI chemical vapor infiltration and CVD chemical vapor deposition; and precise inner circle and outer circle machining is conducted, and the SiC composite cladding pipe is obtained. According to the preparation method disclosed by the invention, through a specific dry winding mode and a densification deposition process, the SiC composite material tube blank is higher in density and better in mechanical property.

The invention relates to the technical field of thermal insulation materials, in particular to a high-temperature-resistant aerogel composite material and a preparation method thereof. The high-temperature-resistant aerogel composite material is prepared from the following components in parts by weight: 15 to 35 parts of reinforced fiber matrix, 43 to 65 parts of silicon-aluminum-zirconium ternary aerogel network, 3 to 12 parts of functional nano filler, 2 to 8 parts of zinc borate flame-retardant component and 0.5 to 2 parts of surface hydrophobic modified layer. Wherein the reinforced fiber matrix is composed of aluminum silicate fibers, silicon carbide fibers and aluminum oxide nanofibers; the molar ratio of silicon to aluminum to zirconium in the silicon-aluminum-zirconium ternary aerogel network is 5: 2: 1; the functional nanofiller comprises aluminum oxide nanoparticles, titanium oxide nanoparticles, carbon nanotubes and boron nitride nanosheets; the zinc borate flame-retardant component is zinc borate; the surface hydrophobic modification layer comprises an inner methyltrimethoxysilane modification layer and an outer hexamethyldisilazane modification layer. The high temperature resistance and thermal shock resistance of the material are remarkably improved, a low-energy-consumption preparation process is adopted, and the material has excellent comprehensive performance.

The invention relates to a preparation method of a SiC fiber surface rare earth silicate anti-oxidation interface phase. The preparation method comprises the following steps: (1) carrying out pre-oxidation treatment on the surface of the SiC fiber; (2) carrying out hydroxylation on the surface of the pre-oxidized SiC fiber; (3) carrying out alkylation modification on the surface of the hydroxylated SiC fiber; (4) dipping the surface-modified SiC fiber in a precursor solution containing a soluble rare earth source, and heating to obtain the SiC fiber with a rare earth precursor deposited on the surface; and (5) carrying out heat treatment on the SiC fiber with the rare earth precursor deposited on the surface to obtain the SiC fiber surface rare earth silicate anti-oxidation interface phase.

The application relates to the field of fireproof bricks, and discloses a baking-free fireproof brick and a preparation method thereof. The baking-free fireproof brick comprises iron tailings, cement, fly ash, a functional additive, fine aggregate, quartz sand, a chromium aluminum phosphate binder, a water reducing agent and water. The functional additive is prepared by using aluminum chloride hexahydrate and alkaline silica sol as raw materials, ammonium molybdate tetrahydrate as a catalyst, growing mullite whiskers on the surface of silicon carbide fibers through vacuum impregnation and heat treatment, modifying the prepared composite silicon carbide fibers through 3-(methacryloxy) propyl trimethoxysilane, and then copolymerizing the modified composite silicon carbide fibers with acrylic acid and 4-hydroxybutyl vinyl ether. The chromium aluminum phosphate binder is prepared by using aluminum hydroxide, phosphoric acid and chromium trioxide as raw materials and calcium hydroxide as a curing agent. The baking-free fireproof brick prepared through the synergistic effect of the components has high compressive strength and bending strength, small water absorption and good baking-free fireproof and heat insulation performance.

The invention relates to a structural wave-absorbing integrated ceramic-based composite material prepared based on 3D printing and a preparation method of the structural wave-absorbing integrated ceramic-based composite material. The preparation method of the structural wave-absorbing integrated ceramic matrix composite material comprises the following steps: mixing chopped silicon carbide fibers, a dispersant, a binder, a catalyst and a solvent to obtain chopped silicon carbide fiber slurry; the slurry is subjected to periodic array arrangement, printing and forming through 3D printing, and a silicon carbide fiber preform of a periodic structure is obtained through drying and glue discharging; inducing in-situ growth of the silicon carbide nanowire on the surface of the preform by using a catalyst introduced into the slurry by adopting CVI, and depositing a BN interface phase on the surface of the silicon carbide nanowire by adopting CVI to form a SiC / BN core-shell structure nanowire; dipping the prefabricated body into a polysilazane precursor, curing and cracking, and introducing a Si3N4 ceramic matrix into the prefabricated body; and repeating dipping, curing and cracking for 5-10 times to densify the composite material, thereby obtaining the structural wave-absorbing integrated ceramic matrix composite material.

The invention relates to the technical field of functional materials, in particular to flexible wave-absorbing silicon carbide fiber cloth and a preparation method thereof. The fiber cloth takes modified silicon carbide fibers as a matrix, graphene nanosheets are uniformly dispersed in the fiber cloth, and the surface of the fiber cloth is coated with a wave-absorbing coating; the wave-absorbing coating comprises the following components in percentage by weight: 30-50% of epoxy resin, 20-35% of carbon nanotubes and the balance of cobalt ferrite nanoparticles; the diameter of the silicon carbide fibers is 5-10 [mu] m, the thickness of the graphene nanosheets is 5-10 nm, the particle size of the cobalt ferrite nanoparticles is 50-100 nm, the pipe diameter of the carbon nanotubes is 10-30 nm, and the length of the carbon nanotubes is 1-10 [mu] m; the silicon carbide fiber cloth prepared by the invention not only has excellent flexibility and mechanical property, but also has excellent wave-absorbing property, and can be widely applied to the fields of stealth clothing, automobile industry, aerospace and the like when being used for preparing stealth composite materials.

The present invention discloses a boron-containing, high-temperature-resistant, near-stoichiometric silicon carbide fiber and a preparation method thereof. The preparation method includes a spinning stage, an infusibility stage, a pre-sintering stage, a densification sintering stage, and a nitriding stage, and is characterized in that: in the infusibility stage, the metal-doped polycarbosilane precursor fiber obtained in the spinning stage is subjected to a boron-doping reaction in an atmosphere containing boron trichloride and a cross-linking reaction in an atmosphere of a gaseous hydrocarbon having a carbon-carbon double bond. The method is simple to operate, has high production efficiency, low production cost, and is easy to use for large-scale industrial production. The prepared boron-containing, high-temperature-resistant, near-stoichiometric silicon carbide fiber has the advantages of low oxygen content, high degree of densification, few defects, stable structure, high tensile strength modulus, large grain size, and good high-temperature resistance, oxidation resistance, and creep resistance.

A process of producing crystalline SiC fibers comprises dispensing amorphous glass fibers from one or more spools, and continuously moving the amorphous glass fibers through a deoxygenation tube furnace to convert the amorphous glass fibers to porous stoichiometric SiC fibers. The porous stoichiometric SiC fibers are continuously moved out the deoxygenation tube furnace. After exiting the deoxygenation tube furnace, the porous stoichiometric SiC fibers are contacted with a sintering aid to produce doped porous stoichiometric SiC fibers. The continuous process further comprises continuously moving the doped porous stoichiometric SiC fibers through a sintering tube furnace to convert the doped porous stoichiometric SiC fibers to densified stoichiometric crystalline SiC fibers. The densified stoichiometric crystalline SiC fibers are continuously moved out of the sintering tube furnace. Additional methods and stoichiometric crystalline SiC fibers are also disclosed.

The invention discloses a preparation method of an integrally-formed ceramic matrix composite hollow guide vane, the hollow guide vane comprises an upper margin plate, a vane body and a lower margin plate, a hollow guide vane preform is obtained by weaving carbon fibers or silicon carbide fibers, and the fiber interweaving density at the joint of the vane body and the lower margin plate is larger than that at other positions; the method comprises the following steps: preparing a mold based on a hollow guide blade preform, fastening and shaping to obtain a tool, impregnating, cracking and depositing a silicon carbide matrix through a precursor to fill pores among fiber bundles for a certain time, dismounting the tool, and continuously impregnating, cracking and depositing the silicon carbide matrix through the precursor; according to the manufacturing method, continuous and complete fibers at the junctions of the blade body and the upper and lower edge plates are achieved, matrix densification is achieved, the overall strength is effectively improved, the risks of cracking and gas leakage are reduced, tools do not need to be replaced in the manufacturing process, the manufacturing complexity can be greatly reduced, and the manufacturing cost is reduced. The processing period is shortened.

The invention relates to the technical field of aluminum alloy composite materials, in particular to a preparation method of a SiC fiber reinforced aluminum matrix composite material. Carrying out hot isostatic pressing treatment on the sheath and the precursor wire, heating the sheath and the precursor wire to 400-500 DEG C at a heating rate of 4-7 DEG C / min, and keeping the temperature and the pressure under the pressure of 80-130 MPa; then cooling to 200 DEG C along with the furnace, maintaining the pressure of 80-130 MPa, and keeping the temperature and pressure; continuously cooling to 100 DEG C along with the furnace, adjusting the pressure to 100 MPa, and keeping the temperature and the pressure; and finally, cooling to room temperature along with the furnace to obtain the SiC fiber reinforced aluminum-based composite material. According to the preparation method, the problems that fibers are broken in advance, interface reaction products are uneven, failure is prone to occurring, and fiber arrangement is uneven in the existing SiC fiber reinforced aluminum matrix composite material preparation process are solved, and the SiC fiber reinforced aluminum matrix composite material with high tensile strength and high compressive strength at room temperature and high compressive strength at 200 DEG C is obtained.

The application provides a preparation method of a Si-based multi-component alloy bonding layer in an environmental barrier coating, and steps are as follows: S1, substrate preparation: taking SiC fiber reinforced SiC composite material as a substrate; S2, preparation of the Si-based multi-component alloy bonding layer: S21, the preparation process is carried out in a directional solidification crystal growth furnace, the furnace comprises a quartz glass tube, a graphite crucible and a heating device; S22, adding silicon material and X metal material into the graphite crucible; S23, fixing the substrate above the graphite crucible; S24, vacuumizing the quartz glass tube; S25, introducing cooling water, turning on the power supply, heating the graphite crucible through the heating device, until the silicon material and the X metal material in the graphite crucible are completely melted into Si-based alloy melt with fluidity; S26, immersing the pre-grown coating composite material substrate into the melt, and then gradually separating the substrate from the Si-based alloy melt through slow downward pulling of the graphite crucible, growing the Si-based alloy on the surface of the composite material uniformly, and preparing the Si-based multi-component alloy bonding layer.

The invention relates to the technical field of aluminum alloy composite materials, in particular to a preparation method of a SiC fiber reinforced aluminum matrix composite material with high compressive strength. A SiCf / 2024Al precursor wire is used as a core material, the SiCf / 2024Al precursor wire is loaded into a 2024Al alloy sheath, sheath packaging, hot isostatic pressing, multi-stage heat treatment and the like are carried out, the high-performance SiCf / 2024Al composite material is prepared, the SiC fiber reinforced aluminum-based composite material is composed of SiC fibers, a carbon layer, a 2024Al alloy matrix and the 2024Al alloy sheath in sequence, the obtained composite material matrix is uniform in grain size and morphology, and the size of the composite material is larger than that of the 2024Al alloy sheath. And large-size second phase segregation is avoided. According to the preparation method, the composite material is processed and formed by coating fibers on the matrix and adopting a hot isostatic technology, and then the matrix and the sheath are subjected to strong plasticity regulation and control through a multi-stage heat treatment system, so that the room-temperature compressive strength of the finally obtained SiCf / 2024Al composite material is 3,500 MPa or above.

The present invention belongs to the technical field of ceramic composite material preparation, and specifically relates to a silicon carbide fiber reinforced carbon ceramic composite material and a preparation method thereof. The preparation method comprises the following steps: (1) laying long-fiber silicon carbide fiber cloth layer by layer, and covering the upper and lower surfaces with two layers of carbon fiber plain cloth, and finally performing a fiber stitching process on the entire body in the longitudinal direction; (2) placing a three-dimensional silicon carbide fiber preform in a precursor gas and densifying it to ≥1.8g / cm by pressure differential chemical vapor infiltration. 3 and peeling off the upper and lower carbon fiber layers; (3) subjecting the C / SIC composite to high-temperature heat treatment under protective gas; (4) placing the C / SIC composite material in silicon powder and subjecting it to high-temperature melt siliconization to produce a carbon-ceramic composite material. The carbon-ceramic material produced by the present invention does not require an impregnation step, and the finished product has high density, high strength, high temperature resistance and other good properties, as well as high tensile strength and low porosity.

The application relates to the field of environment-friendly ceramic technology, and particularly relates to a high-wear-resistance environment-friendly ceramic material and a preparation method thereof. The preparation method comprises the following steps: weighing raw materials according to weight parts: strontium titanate 10-15 parts, aluminum oxide 10-15 parts, mixed and adjusted silicon carbide fiber adjusting and connecting material 7-11 parts, and modified titanium oxide agent 5-8 parts. The environment-friendly ceramic material adopts the strontium titanate, the aluminum oxide, the mixed and adjusted silicon carbide fiber adjusting and connecting material and the modified titanium oxide agent, the raw materials are adjusted and matched, the raw materials are synergized, the environment-friendly ceramic material is prepared, the wear resistance, the heat conductivity and the dielectric loss of the environment-friendly ceramic material can be coordinately improved, and the alkali corrosion stability of the product is obviously improved.

This invention discloses a heat-resistant and corona-resistant enameled wire and its preparation method, relating to the field of cable conductor technology. Using an aluminum-copper alloy as the substrate, an atomic layer deposition technique is used to construct a nickel-copper gradient coating on the surface of silicon carbide fibers. Ultraviolet laser is then used to process gradient holes along the fiber axis. A dynamic rotating magnetic field is employed in response to the nickel layer on the fibers, and ultrasonic waves and pulsed pressure are simultaneously applied to promote the penetration of molten metal along directional channels, improving the conductor's heat resistance degradation caused by low liquid metal filling rate. Finally, in-situ reaction and hot isostatic pressing are used to complete interface strengthening and densification, resulting in a composite conductor. A composite of polyethylene terephthalate and nylon provides flexibility and basic insulation. Plasma-treated boron nitride fibers are exposed to dopamine to obtain aminated boron nitride fibers, which serve as inorganic fibers to construct a high-temperature skeleton and heat dissipation channels, further enhancing the interfacial bonding strength, thus preparing a heat-resistant and corona-resistant enameled wire.

The invention belongs to the field of interface structure characterization of a monofilament SiC fiber reinforced titanium / titanium aluminum-based composite material, and particularly relates to a quasi-in-situ measurement method for the thickness of an interface reaction layer of the monofilament SiC fiber reinforced titanium / titanium aluminum-based composite material. The monofilament SiC fiber reinforced titanium / titanium aluminum matrix composite is prepared by adopting a precursor wire method in combination with a hot pressing or hot isostatic pressing process, and an interface reaction layer can be formed on a fiber-matrix interface in the composite forming process of fibers and a titanium / titanium aluminum alloy matrix. And the thickness measurement positions and the number of measurement points of the composite material interface reaction layer in different states are specified, so that the accuracy and the consistency of measurement results are ensured. The method is suitable for measuring the thickness of the interface reaction layer of the monofilament SiC fiber reinforced titanium / titanium-aluminum-based composite material in a forming state and a heat treatment state, and a material data basis is provided for structural design and application of a monofilament SiC fiber reinforced titanium / titanium-aluminum-based composite material component.

The present invention belongs to the technical field of metal matrix composite materials, and specifically relates to a SiC f / Ti3Al composite material residual stress control and optimization method. The present invention introduces an interface stress release layer on the surface of SiC fiber, which significantly improves the interface adaptability between SiC fiber and Ti3Al matrix, and effectively reduces the residual stress induced by the difference in thermal expansion coefficient at the interface; matrix stress release layers with high plasticity are alternately introduced into the Ti3Al matrix to construct a laminated structure, which can effectively release the residual stress of SiC / Ti3Al composite material and prevent the material from failing due to stress accumulation during service. The preparation of composite materials using the SiC / Ti3Al pioneer wire provided by the present invention can achieve residual stress control and optimization, effectively solve the problem of high residual stress, and improve the stability of materials during processing and service, which is of great significance to the application research of SiC / Ti3Al composite materials.

The invention provides a ZrO2 (at) SiC (at) NiCo2O4 / NiO composite material with high temperature tolerance and a preparation method and application thereof, the composite material takes ZrO2 (at) SiC fibers as a three-dimensional conductive network framework, and NiCo2O4 / NiO nanosheets are anchored on the surfaces of the ZrO2 (at) SiC fibers. The composite material shows excellent electromagnetic wave absorption performance in a high-temperature environment.

The present invention belongs to the technical field of SiC / Cu-based precursor wires, and specifically relates to a SiC / Cu-based precursor wire, a preparation method, and applications thereof, and a SiC / Cu-based composite material, and a preparation method and applications thereof. The SiC / Cu-based precursor wire provided by the present invention deposits a transition layer on the surface of a SiC fiber. The multi-layer coating includes alternating TaN layers and Ta layers. The interaction between the Ta layer and the interface of the layers in the multilayer structure can significantly improve the toughness of the transition layer and improve the thermal residual stress in the SiC / Cu-based composite material, thereby improving the tensile strength of the SiC / Cu-based composite material while ensuring improved interface bonding. At the same time, it can hinder the corrosion of the Cu matrix on the SiC fiber matrix, improve the interface stability, and protect the fiber matrix.

The invention relates to the technical field of spaceflight protective clothing, and provides a spaceflight titanium alloy fiber composite protective clothing and a preparation method thereof.The preparation method comprises the steps that materials are pretreated, titanium alloy fibers are sequentially subjected to surface oil removal and acid pickling activation treatment, and then the titanium alloy fibers are immersed into a specific hydrothermal reaction solution to grow ceramic whisker reinforcements in situ; meanwhile, the TC4 titanium alloy powder, the SiC fibers, the Ni-Ti shape memory alloy microwires, the ZrO2-Y2O3 temperature-sensitive ceramic particles, the self-repairing microcapsules and the flexible graphene sensor array are subjected to pretreatment such as activation, annealing and dispersion. A three-dimensional interlocking microstructure is formed through in-situ growth of single crystal aluminum oxide whiskers on the surface of the titanium alloy fiber, the three-dimensional interlocking microstructure is cooperated with the shape memory fitting effect of SMA microwires and the thermal expansion matching effect of temperature-sensitive ceramic particles, the interlayer interface bonding strength is remarkably improved, the stable performance is maintained under an extreme temperature cycle, and the temperature-sensitive ceramic fiber composite material is prepared. And the layering defect of a traditional bonding process is thoroughly overcome.

The invention relates to the technical field of environment-friendly ceramics, in particular to a high-wear-resistance environment-friendly ceramic material and a preparation method thereof. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 10-15 parts of strontium titanate, 10-15 parts of aluminum oxide, 7-11 parts of a silicon carbide fiber-doped blending material and 5-8 parts of a modified titanium oxide agent; according to the environment-friendly ceramic material disclosed by the invention, strontium titanate is matched with aluminum oxide, the blending material blended with silicon carbide fiber and the modified titanium oxide agent as raw materials, and the raw materials are blended, coordinated and synergistic, so that the wear resistance, the thermal conductivity and the dielectric loss of the prepared environment-friendly ceramic material can be improved in a coordinated manner, and the alkali corrosion resistance stability effect of the product is remarkable.