20results about How to "Improve high temperature mechanical properties" patented technology

The invention further discloses a preparation method of the wide-temperature-range, high-performance and high-binding-force soft and hard composite coating. The preparation method comprises the steps of cleaning, ion implantation, preparation of a soft layer metal Ti, preparation of a hard layer TiZrAlCrSiMN, preparation of a soft layer metal Zr and preparation of the hard layer TiZrAlCrSiMN. The invention further discloses application of the wide-temperature-range, high-performance and high-binding-force soft and hard composite coating in a dry cutting tool. The invention discloses the wide-temperature-range high-performance high-binding-force soft and hard composite coating which is prepared through the preparation method, and the wide-temperature-range high-performance high-binding-force soft and hard composite coating solves the problems that an existing tool coating is low in high-temperature hardness, poor in abrasion resistance and poor in erosion resistance and cracking resistance.

The invention relates to an additive manufacturing high-temperature-bearing nickel-based superalloy and a preparation method thereof, and relates to the technical field of superalloy materials and additive manufacturing. According to the main technical scheme, the preparation method of the high-temperature-bearing nickel-based superalloy for additive manufacturing comprises the following steps: preparing alloy powder: preparing the alloy powder; wherein the alloy powder comprises the following chemical components in percentage by weight: 17.0 to 21.0 weight percent of Cr, 50 to 55 weight percent of Ni, 5.0 to 5.5 weight percent of Nb, 2.8 to 3.3 weight percent of Mo, 0.75 to 1.15 weight percent of Ti, 0.3 to 0.7 weight percent of Al, 0.2 to 0.5 weight percent of C, 0.1 to 0.3 weight percent of Mn, 0.1 to 0.3 weight percent of Si, less than or equal to 0.015 weight percent of S, less than or equal to 0.02 weight percent of O, 0.01 to 1.0 weight percent of Y and the balance of Fe; and the additive manufacturing step is conducted, specifically, the alloy powder with the set particle size range is screened out from the alloy powder to be subjected to additive manufacturing treatment, and the additive manufacturing high-temperature-bearing nickel-based high-temperature alloy is obtained. The method is mainly used for preparing the in-situ oxide dispersion strengthened additive manufacturing high-temperature-bearing nickel-based high-temperature alloy with excellent high-temperature performance.

The invention further discloses a preparation method of the low-cost titanium-zirconium-based superhard self-lubricating tool coating. The preparation method comprises the processes of cleaning, ion implantation, bonding layer deposition, functional layer deposition and lubricating layer deposition. The invention further discloses application of the low-cost titanium-zirconium-based superhard self-lubricating tool coating in a superhard tough high-temperature-resistant tool. The invention discloses the low-cost titanium-zirconium-based superhard self-lubricating tool coating, the low-cost titanium-zirconium-based superhard self-lubricating tool coating is prepared through the preparation method, and the low-cost titanium-zirconium-based superhard self-lubricating tool coating solves the problems that an existing tool coating is low in high-temperature hardness, poor in wear resistance, weak in cracking resistance and the like.

The invention discloses a microalloying material of a cast Al-Cu alloy for an engine and a heat treatment process and application, and belongs to the technical field of aluminum alloys. The microalloying material comprises the following components in percentage by weight: 3 to 6 percent of Cu, 0.4 to 0.8 percent of Mn, 0.1 to 0.5 percent of Ti, 0.1 to 0.5 percent of La, 0.1 to 0.3 percent of Zr, 0.1 to 0.3 percent of Sc, 0.1 to 0.3 percent of Er, less than or equal to 0.10 percent of Fe and the balance of Al. According to the microalloying material, the hardness is larger than 159 HV at the normal temperature, the yield strength is larger than 359 MPa, the tensile strength is larger than 469 MPa, the yield strength is larger than 109 MPa at the temperature of 400 DEG C, the tensile strength is larger than 128.6 MPa, the heat resistance is greatly improved, and the technical defects that a traditional Al-Cu alloy material is poor in mechanical property and heat resistance are overcome.

The invention relates to a preparation method of a high-temperature-resistant, radiation-resistant and stealth multifunctional integrated ceramic matrix composite material. The preparation method comprises the following steps: a, preparing coating slurry containing functional filling particles by ball milling and preparing silicon carbide (SiC) prefabricated cloth by a chemical vapor infiltration (CVI) process; b, uniformly coating the surface of the SiC prefabricated cloth with the mixed slurry, and neatly stacking and fixing; and c, depositing a silicon nitride (Si3N4) matrix on the laminated and fixed prefabricated body by a CVI (Chemical Vapor Infiltration) process for densifying. According to the preparation method provided by the invention, the integration of a high-temperature-resistant, radiation-resistant and stealth multifunctional structure of the ceramic-based composite material is realized, the mechanical property of the ceramic-based radiation shielding material in a high-temperature environment is enhanced, and the multifunctionality and high-temperature environment durability of the ceramic-based composite material are improved; meanwhile, the application range of the ceramic-based composite material is expanded.

The invention discloses an Ir-Rh-RE alloy and a preparation method thereof, and belongs to the technical field of alloy preparation. According to the alloy, Ir serves as a matrix, Rh with the mass fraction being 25%-30% and RE with the mass fraction being 0.05%-0.5% are contained, and RE is one or two of La and Ce which are added in a compounded mode. The mechanical property of the iridium-based alloy is improved by utilizing a composite strengthening means of solid solution strengthening of the Rh element and precipitation strengthening and grain refinement strengthening of a trace RE element compound. By optimizing the preparation process, the Ir-Rh-RE alloy material with excellent comprehensive performance such as high-temperature mechanics, oxidation resistance and corrosion resistance can be obtained, and the highest performance of the Ir-Rh-RE alloy material reaches that the room-temperature tensile strength is 1220 MPa; the tensile strength at 1500 DEG C is 49.5 MPa; after 10h at 1500 DEG C, the endurance strength is 12.6 MPa; the creep life is 65.5 h at the temperature of 1500 DEG C and the pressure of 5 MPa; the creep rate is 0.06% / h at the temperature of 1500 DEG C and the pressure of 5 MPa; under a static atmospheric condition, the alloy weightlessness is 50 mg / cm < 2 > within 10 hours at 1500 DEG C. The Ir-Rh-RE alloy disclosed by the invention can be used as an airspace engine jet pipe, a crucible, a glass fiber bushing and other structural materials needing comprehensive properties such as high temperature, high strength, oxidation resistance and corrosion resistance.

This invention discloses a refractory high-entropy alloy resistant to high-temperature molten aluminum corrosion and erosion-wear, its preparation method, and its applications. The refractory high-entropy alloy of this invention comprises, by atomic percentage: 40-50 at.% Nb, 35-40 at.% Ti, 4-10 at.% Mo, 4.5-5 at.% Cr, and no more than 10 at.% Al. This invention obtains the refractory high-entropy alloy by mixing and melting the raw materials under a protective atmosphere. The refractory high-entropy alloy ingot of this invention has a single-phase BCC microstructure, exhibiting stable structure, good mechanical properties, and excellent resistance to molten aluminum corrosion and erosion-wear. The Nb-Ti-Mo-Cr based refractory high-entropy alloy resistant to molten aluminum corrosion and erosion-wear prepared using this invention can significantly improve the service life of components, reduce replacement frequency, and has high economic benefits.

This invention relates to the field of high-purity aluminum and aluminum alloy production technology, and particularly to a porous alumina ceramic material, its preparation method, and its application. The material comprises a composite aggregate and an organic binder, wherein the mass ratio of the composite aggregate to the organic binder is 47:3. The composite aggregate comprises 9 wt%–17 wt% inorganic binder and 83 wt%–91 wt% aggregate particles. The inorganic binder comprises: 40 wt%–50 wt% B₂O₃, 20 wt%–29 wt% Al₂O₃, 10 wt%–15 wt% SiO₂, 9.4 wt%–14.4 wt% MgO, 0–0.5 wt% Na₂O, 0–0.5 wt% K₂O, and 0–10 wt% Re₂O₃, where Re is a rare earth element. This method uses corundum or α-Al₂O₃ as a framework and rare earth composite oxides as an inorganic binder. A high-temperature reaction forms sintering necks between the aggregate particles, resulting in a porous alumina ceramic with a bimodal pore distribution. Two different pore sizes are distributed in situ on the surface of the skeleton particles and the sintered neck, achieving a dual-capture filtration effect for aluminum molten inclusions. This solves the problem that filters with large pore sizes cannot simultaneously filter small-grain-sized impurities.

The invention provides a nickel-based high-temperature alloy for high-temperature oxidation-resistant additive manufacturing and a preparation method, and belongs to the technical field of nickel-based high-temperature alloys for additive manufacturing, the nickel-based high-temperature alloy for additive manufacturing is prepared from the following chemical components in percentage by weight: 5.5 to 6.0 weight percent of Al, 14.0 to 14.4 weight percent of Co, 7.0 to 7.5 weight percent of Cr, 0.01 to 0.05 weight percent of Mo, 0.4 to 1.0 weight percent of Ta, 0.01 to 0.03 weight percent of Ti, 2.1 to 2.5 weight percent of W, 0.1 to 0.3 weight percent of C, 0.01 to 0.03 weight percent of B, 2.0 to 2.5 weight percent of Nb and the balance of Ni. The nickel-based high-temperature alloy suitable for additive manufacturing, which has excellent high-temperature oxidation resistance, no crack defect and low hole defect, is prepared, that is, the crack-free alloy is prepared under the additive metallurgy condition, and meanwhile, the defects such as low-level holes are contained; and on the basis, the additive manufacturing nickel-based high-temperature alloy has excellent high-temperature oxidation resistance.

The application discloses a spray forming cold-rolled work roll blank and a preparation method thereof. By designing material components, the toughness of the base body is increased to meet the rolling requirement of ultra-high strength steel. Meanwhile, the spray forming technology is adopted, so that the prepared spray forming cold-rolled work roll blank has comprehensive improvement in normal temperature and high temperature mechanical properties, especially the high temperature toughness, wear resistance and heat crack resistance are greatly improved, so as to solve the peeling, uneven carbide and relatively insufficient wear resistance of the high-speed steel work roll prepared by ESR smelting and forging technology.

The invention discloses a refractory high-entropy alloy and a preparation method thereof, and belongs to the technical field of high-entropy alloys. The preparation method comprises the following steps: (1) pretreatment: removing surface oxide layers of metals Al, Cr, Ta and Ti, carrying out ultrasonic cleaning on the metals by using absolute ethyl alcohol, then drying the metals, carrying out acid pickling, then carrying out ultrasonic cleaning on the metals by using clear water, finally cleaning the metals by using absolute ethyl alcohol, and drying to obtain clean metals Al, Cr, Ta and Ti; (2) vacuum arc melting: weighing Al, Cr, Ta and Ti according to the molar ratio of refractory high-entropy alloy elements, sequentially putting Al, Cr, Ta and Ti into a water-cooling copper mold crucible from bottom to top, and carrying out vacuum arc melting on Al, Cr, Ta and Ti to obtain an alloy ingot; according to the AlxCrTaTi refractory high-entropy alloy prepared through the preparation method, on the basis that element composition is reduced, the alloy with the controllable Laves phase and good comprehensive mechanical performance is obtained, the use performance of the refractory high-entropy alloy is improved, and the application scene of the refractory high-entropy alloy is expanded.

The application discloses a preparation method and application of a liquid rocket engine thrust chamber copper alloy inner wall, and relates to the technical field of thin-walled component manufacturing of a rocket engine. The preparation method comprises the following steps: solid solution heat treatment, water quenching and surface pretreatment are performed on a copper alloy blank; after gradient preheating, the following steps are sequentially performed: first-pass coarse spinning, in-situ stress relief treatment, second-pass medium spinning, dynamic grain regulation and holding treatment and third-pass fine spinning; finally, the finished product is obtained through post-treatment, low-temperature aging heat treatment and detection. Through the cooperation of multi-pass variable-speed cross spinning and temperature control between passes, the application effectively eliminates interlayer delamination and microcracks, refines grains and releases residual stress, and significantly improves the high-temperature mechanical properties and service reliability of the thrust chamber inner wall.

The invention provides a high-entropy tantalum-zirconium-carbon ceramic precursor and a preparation method thereof, and belongs to the technical field of ceramic materials, and the preparation method comprises the following steps: in a nitrogen atmosphere, adding a metal ion strong coordination agent into a tantalum source solution, carrying out heating reaction, adding a metal ion weak coordination agent, and carrying out heating reaction; then adding a mixture of an organic solvent and water, and sequentially carrying out heating reflux and curing to obtain a tantalum carbide ceramic precursor in a nitrogen atmosphere; preparing a zirconium intermediate 1; preparing a zirconium intermediate 2; under anhydrous and anaerobic conditions, uniformly stirring an organic solvent, the zirconium intermediate 1 and the zirconium intermediate 2, and reacting to obtain a zirconium carbide ceramic precursor; uniformly stirring the tantalum carbide ceramic precursor, the zirconium carbide ceramic precursor and an organic solvent, and sequentially carrying out heat treatment and drying to obtain the high-entropy tantalum-zirconium-carbon ceramic precursor. The high-entropy tantalum-zirconium-carbon ceramic precursor with stable high-temperature mechanical properties can be prepared, the process is simple, the controllable degree is high, and the ceramic yield is high.

The invention belongs to the technical field of aluminum alloy materials, and particularly discloses a microalloyed aluminum-copper-cerium heat-resistant aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 7%-9.5% of Cu, 1.3%-2.3% of Ce, 0.1%-0.5% of Mn, 0.1%-0.4% of Sc, 0.1%-0.4% of Zr, 0.1%-0.5% of Mg, 0.1%-0.3% of Si and the balance Al and inevitable impurities, the content relation of Cu and Ce is that Cu is equal to 2Ce + 4%-5%, and the content relation of Mg and Si is that Mg is larger than 1.5 Si. The aluminum alloy has high yield strength and high tensile strength in a high-temperature environment, the yield strength and the tensile strength at the temperature of 300 DEG C are 235-248 MPa and 245-257 MPa respectively, the ductility is 4-5%, the yield strength and the tensile strength at the temperature of 400 DEG C are 100-106 MPa and 105-110 MPa respectively, the ductility is 9-10%, and the aluminum alloy is obviously superior to a traditional ZL206 alloy and a traditional ZL207 alloy.

The invention relates to the technical field of metal additive manufacturing, and provides a gamma'phase reinforced cobalt-based high-temperature alloy for an LPBF process and a preparation method of the gamma 'phase reinforced cobalt-based high-temperature alloy. The gamma'phase reinforced cobalt-based high-temperature alloy for the LPBF process comprises the following elements: 27-32% of Ni; 11%-13% of Ta; 4 to 6 percent of Al; 4-5% of V; 1-2% of Ti; and the balance of Co. The preparation method comprises the steps that alloy element materials are smelted and prepared into cobalt-based alloy spherical powder, the obtained cobalt-based alloy spherical powder is placed in a laser powder bed fusion printing device, and the cobalt-based alloy spherical powder is prepared into a workpiece in a set shape; a unique net-shaped gamma'precipitated phase is formed, the traditional square block-shaped L12 morphology structure is broken, and the structure has excellent room-temperature and high-temperature mechanical properties.

The invention provides a method for improving the high-temperature interface strength of a quartz fiber composite material. The method comprises the steps of fiber cleaning, fiber surface activating treatment, fiber surface grafting treatment and composite material forming. Taking the quartz fiber reinforced polyimide resin composite material as an example, the bending strength of the composite material prepared by the method is greater than or equal to 306Mpa under the test condition of 400 DEG C / 20min, and is improved by 43%; the interlayer shear strength is greater than or equal to 21.1 MPa and is improved by 35.2%, and the dielectric constant is less than or equal to 3.4. The method solves the problems of poor interface bonding strength, low mechanical strength and poor structural stability of the quartz fiber reinforced resin-based composite material under the long-time high-temperature working condition, and is simple, easy to operate and suitable for batch production and application.

The invention relates to the technical field of alloy coating materials, and particularly discloses an anti-oxidation coating for a high-pressure hot-pressing mold and a preparation method of the anti-oxidation coating. The high-pressure hot-pressing mold anti-oxidation coating comprises a transition layer and a functional layer which are sequentially arranged from a mold base body to the outside, the transition layer is a TiN-SiC gradient composite layer, the functional layer takes Al2O3-NiCrAlY as a base body, and nano ZrB2 and rare earth CeO2 which are subjected to double modification treatment are compositely doped; and the dual-modified nano ZrB2 is ZrB2 particles which are coated with a silane coupling agent KH-560 and a NiCr alloy. The anti-oxidation coating of the high-pressure hot-pressing mold has both oxidation resistance and wear resistance, and the high-temperature hardness stability and wear resistance of the anti-oxidation coating are effectively enhanced.

The invention provides a high-temperature-resistant GFRP wood composite board based on graphene oxide / MXene multi-dimensional hybrid interface modification and a preparation method and application of the high-temperature-resistant GFRP wood composite board. The composite board is formed by hot-pressing and bonding a wood base body and a modified GFRP reinforcement dispersed in the wood base body through an adhesive. Wherein the modified GFRP reinforcement body is a waste GFRP particle with a multilayer interface structure constructed on the surface, and the structure sequentially comprises a hydroxylation activation layer formed on the surface of the GFRP through alkali treatment, a surface modification layer formed on the surface of the GFRP through alkali treatment, and a surface modification layer formed on the surface of the GFRP through alkali treatment from inside to outside; the amino silane flexible buffer layer is grafted on the hydroxylation anchoring layer; the graphene oxide / MXene nano composite rigid protective layer is adsorbed on the amino silane flexible buffer layer through electrostatic self-assembly. The high-temperature mechanical property of the composite board is remarkably improved, the interface toughness is enhanced, and the utilization rate of MXene in the composite board is high.

The present invention discloses a microalloying material, a heat treatment process and an application of a cast Al-Cu alloy for an engine, and belongs to the technical field of aluminum alloys. The microalloying material comprises the following components: Cu: 3-6wt%, Mn: 0.4-0.8wt%, Ti: 0.1-0.5wt%, La: 0.1-0.5wt%, Zr: 0.1-0.3wt%, Sc: 0.1-0.3wt%, Er: 0.1-0.3wt%, Fe≤0.10wt%, and the balance is Al. The microalloying material of the present invention has a hardness greater than 159HV at room temperature, a yield strength greater than 359MPa, and a tensile strength greater than 469MPa. At a temperature of 400°C, the yield strength is greater than 109MPa, the tensile strength is greater than 128.6MPa, and the heat resistance is greatly improved, which solves the technical defects of poor mechanical properties and poor heat resistance of traditional Al-Cu alloy materials.

The application relates to the technical field of alloy coating materials, and particularly discloses a high-pressure hot-pressing die oxidation-resistant coating and a preparation method thereof. The high-pressure hot-pressing die oxidation-resistant coating comprises a transition layer and a functional layer arranged outward from a die base body, the transition layer is a TiN-SiC gradient composite layer, the functional layer takes Al2O3-NiCrAlY as a base body, and is compounded and doped with double-modified nano ZrB2 and rare earth CeO2; the double-modified nano ZrB2 is ZrB2 particles coated with a silane coupling agent KH-560 and a NiCr alloy. The high-pressure hot-pressing die oxidation-resistant coating has oxidation resistance and wear resistance, and effectively enhances the high-temperature hardness stability and wear resistance of the oxidation-resistant coating.