137 results about "Pressureless sintering" patented technology

The invention relates to a hard alloy micro-texture tool based on discharge plasma pressureless sintering and a preparation method. Comprising the following steps: preparing a micro-texture male die pressing head; wC-Co mixed powder is obtained; the pressure head in the step (1) is adopted to apply 150-180 MPa pressure to the WC-Co mixed powder, the pressure is maintained for 60 min, and a biscuit is obtained after demolding; putting the biscuit into a graphite mold, assembling the mold, carrying out vacuum pressureless sintering on the biscuit, heating to 1300-1400 DEG C at the heating rate of 90-110 DEG C / min, carrying out heat preservation for 10 + / -2 minutes, and then cooling to room temperature along with a furnace to obtain a hard alloy block with a micro-texture on the surface; and the micro-texture surface of the hard alloy block is only polished to be bright. According to the method, thermal damage and fusion edge collapse are thoroughly avoided, and high-precision, namely high geometric fidelity, high efficiency, namely short sintering period and low-cost preparation of the microstructure is realized.

The invention provides a method for preparing a zirconium boride ceramic material through pressureless sintering, and belongs to the technical field of zirconium boride ceramics. The method comprises the steps of preparing zirconium boride composite powder, modifying silicon carbide nanowires and mixing and sintering. The method for modifying the silicon carbide nanowire comprises the steps of acid treatment and modification, the modification step comprises the following steps: adding aluminum isopropoxide into absolute ethyl alcohol, adding a nitric acid solution, stirring for 1.5-2.0 hours at the temperature of 60-63 DEG C, adding the acid-treated silicon carbide nanowire, carrying out ultrasonic dispersion and water bath evaporation, then drying, putting into a muffle furnace, and carrying out heat preservation for 2.0-2.2 hours at the temperature of 490-500 DEG C to obtain a modified silicon carbide nanowire; the ceramic material prepared by adopting the method disclosed by the invention is high in density, good in mechanical property and excellent in high-temperature oxidation resistance and stability in a complex environment.

The invention relates to a method for preparing MgAlON ceramic with high infrared transmittance by utilizing coarse powder pressureless sintering, and belongs to the field of ceramic preparation. A method for preparing MgAlON ceramic with high infrared transmittance by utilizing pressureless sintering of coarse powder comprises the steps that pure-phase MgAlON powder and a sintering aid are subjected to ball-milling mixing, drying and granulation to obtain mixed powder of MgAlON and the sintering aid, the mixed powder is formed and subjected to pressureless sintering in the nitrogen atmosphere to obtain the MgAlON ceramic, the atomic ratio of Mg to Al to O to N in the pure-phase MgAlON powder is 1: (10-20): (15-25): (2-4), and the atomic ratio of Mg to Al to O to N in the sintering aid is 1: (10-20): (15-25): (2-4). The D50 of the mixed powder of the MgAlON and the sintering aid is 1.1-2.0 [mu] m, and the particle size distribution range is 0.2-10 [mu] m. According to the method, the difficulty of a ball-milling process is small, the risk that impurities are introduced due to particle refinement can be effectively reduced, sintering equipment is easy to obtain, the heat preservation time in the pressureless sintering process is short, the obtained ceramic is high in infrared transmittance, good in energy-saving effect, high in efficiency, low in cost and suitable for preparation of large-size and complex-shape sample pieces, and industrialization is easy to achieve.

The invention discloses Si-based MAX phase powder and a preparation method thereof, and belongs to the technical field of ceramic material preparation. The preparation method of the Si-based MAX phase powder comprises the following steps: mixing a transition metal source, polysiloxane, a solvent, a curing agent and a platinum catalyst to obtain a mixed solution; the curing agent is vinyl modified siloxane; heating and curing the mixed solution to obtain a solid precursor; and crushing the solid precursor into powder, and then carrying out pressureless sintering in a protective atmosphere, thereby obtaining the product. According to the method, subsequent ball milling and other procedures are omitted, and impurity introduction to the product is avoided. According to the invention, the operation difficulty is greatly reduced, the production efficiency is improved, the energy consumption is reduced, and large-scale and low-cost production is realized.

The application discloses a ZTA ceramic particle preform, preparation and application of realizing metallurgical interface combination between ZTA and high manganese steel matrix. The application adopts a ball milling process to prepare a slurry from high manganese steel powder, Zr-Fe powder, ZTA micro powder and ethanol, soaks ZTA particles in the slurry, takes out and dries and sinter, obtains ZTA particles with a single layer of coating, soaks the ZTA particles in high manganese steel powder slurry again, obtains ZTA particles with two layers of coating, obtains ZTA ceramic preform through pressureless sintering, realizes solidification of the double coating layers, and the ZTA ceramic porous preform can effectively promote high manganese steel melt infiltration and prevent the preform from collapsing under thermal shock during casting. Through the bridge effect of the FeZr-ZTA-high manganese steel powder double coating layers, a metallurgical combination interface is formed between the ZTA and the high manganese steel matrix, so that the prepared ZTA ceramic particle reinforced high manganese steel composite material has excellent three-body wear resistance.

Provided are an oxide sintered body mainly containing a molybdenum oxide, a sputtering target containing the sintered body, and an oxide thin film formed by the sintered body. In the present invention, by adding a specific (pseudo) metal oxide in a prescribed range to a molybdenum oxide and a niobium oxide which are difficult to sinter, the sinterability can be improved and high-density characteristics can be ensured even if pressureless sintering is performed.

The application provides a low-temperature sintering silicon nitride ceramic powder, a silicon nitride ceramic and a preparation method thereof, and uses beta silicon nitride powder as raw material and low-melting-point glass powder as a sintering aid. The beta silicon nitride powder with a content of 75-90wt% and a particle size range of 0.5-1um is selected, and the low-melting-point glass powder with a content of 10-25wt% is added. The mixed powder is ball milled, dried and pressed into a sheet, and then cold isostatic pressing is carried out, and pressureless sintering is carried out at 1400-1600 DEG C under a nitrogen atmosphere to obtain a silicon nitride ceramic material. The beta silicon nitride powder provided by the application can directly sinter the beta silicon nitride ceramic at low temperature. The preparation method of the silicon nitride ceramic provided by the application reduces the sintering temperature of the silicon nitride, improves the preparation efficiency of the silicon nitride ceramic, and is mainly applied to refractory fire-resistant materials.

DEPCT6720 / 08 / 2567 Zirconia powder containing 2% by mol or more and 8% by mol or Less than that of the stabilizing element and 50 ppm or less of titanium (Ti) and containing Activation energies of 225 kJ / mol or more, and 300 kJ / mol or less, are provided. There is at least one zirconia powder that can produce sintered objects with high transparency. By using pressureless sintering, a method suitable for industrial production, the following can be employed: Zirconia powder production: methods for manufacturing calcined objects using zirconia powder and techniques. For the production of sintered objects using zirconia powder, the powder is desirablely manufactured by: The method involves the following steps: adjusting the pH of the raw material solution containing the source. Zirconium and its stabilized sources are at 3.5% or higher and 5.5% or lower. Heating the raw material solution to produce zirconia sol solution; mixing the zirconia solution. And alkaline solutions for co-sludge production and heat treatment of the co-sludge;

The invention belongs to the field of boron carbide production equipment, and particularly relates to a pressureless sintered boron carbide powder conveying device with visual inspection, which comprises a base, a vacuum suction machine main body is arranged on one side of the upper end surface of the base, a hose is communicated with a feeding hole of the vacuum suction machine main body, one end of the hose is communicated and fixedly connected with a suction pipe, and the other end of the hose is communicated with a feeding hole of the vacuum suction machine main body. A lifting plate is fixedly connected to one side of the material suction pipe, a first guide rail plate is fixedly connected to one side of the upper end face of the base, one end of the lifting plate is slidably connected to the first guide rail plate, and a material suction auxiliary assembly is further arranged on the base. According to the boron carbide powder suction device, the material suction auxiliary assembly is utilized, in the whole material suction conveying process, boron carbide powder in the container is gathered through the enclosure structure, all the boron carbide powder in the container can gradually move into the suction range of the material suction pipe, and all the boron carbide powder in the container can be sucked only by descending the material suction pipe at a constant speed; therefore, the process that an operator holds the material suction pipe by hand to suck the boron carbide powder in the container is omitted.

The invention relates to the field of ultrahigh-temperature ceramic materials, and discloses rare earth element doped quinary high-entropy boride powder and a preparation method thereof. The preparation method of the rare earth element doped quinary high-entropy boride powder comprises the following steps: 1) taking metal oxide powder, boron carbide powder and graphite powder as raw materials, and performing wet mixing to prepare mixed powder, 2) briquetting the mixed powder to prepare a green body, putting the green body into a high-temperature carbon tube furnace into which protective gas is introduced, heating, and carrying out pressureless sintering to obtain clinker; and 3) grinding the clinker to obtain the rare earth element doped high-entropy boride powder. The rare earth element doped quinary high-entropy boride powder prepared by the method has the advantages of high purity, no impurity phase, uniform metal element distribution and high rare earth element content, the preparation process is simple, the cost is low, the reaction temperature is lower, and large-scale production is facilitated.

The application belongs to the technical field of ceramic matrix composite, and discloses a hypersonic aircraft hot end component and a preparation method and application thereof, and the method comprises the following steps: (1) printing a green body of the hypersonic aircraft hot end component to be prepared by taking ceramic-metal silicon-binder composite powder as raw materials; wherein the raw materials of the ceramic-metal silicon-binder composite powder comprise ceramic powder, metal silicon and organic binder; (2) after the green body is solidified, pressureless sintering is first carried out under the condition of nitrogen, then carbon precursor is infiltrated and reaction sintering is carried out, and then the hypersonic aircraft hot end component is obtained. By means of nitriding, uniformly distributed silicon nitride bonding phases and pyrolytic carbon are generated in the body, reaction sintering silicon infiltration converts the pyrolytic carbon into silicon carbide, the obtained material contains in-situ nitrided silicon nitride and secondary silicon carbide (beta-SiC) generated by reaction sintering silicon infiltration as bonding phases, and has more excellent mechanical properties.

The invention belongs to the technical field of ceramic tube preparation, and particularly relates to a pressureless sintered silicon carbide grinding medium and a preparation method thereof. The invention relates to a preparation method of a pressureless sintered silicon carbide grinding medium, which comprises the following specific steps: proportioning: preparing basic materials of the silicon carbide grinding medium according to the weight ratio: 98-99 wt% of submicron silicon carbide and 1-2 wt% of boron carbide; ball-milling and mixing; performing spray granulation; intensely stirring, mixing and granulating; drying the biscuit; dewaxing the biscuit; and sintering at high temperature to finish preparation. The preparation method is simple in technological process, use of large forming equipment such as a dry press and a cold isostatic press is avoided, the production input cost is greatly reduced, and the prepared pressureless sintered silicon carbide grinding medium is good in sphere sphericity degree, high in density, high in strength, high in toughness, ultrahigh in wear resistance, long in service life, resistant to high temperature and good in chemical stability.

The invention discloses a diamond string bead, a preparation method of the diamond string bead and a preparation method of a diamond wire saw. The preparation method of the diamond string bead comprises the following steps: adding cylindrical powder mixed with an organic binder into a die cavity of a main die; adding a plurality of diamonds into a die cavity of the main die according to a first rule, wherein the plurality of diamonds are positioned in the cylindrical powder; the lower pressing head is moved upwards, the upper pressing head is moved downwards, pressure is applied to the column powder and the diamonds in the die cavity from the upper side and the lower side, and a metal column containing multiple diamonds is formed through cold pressing; taking out and carrying out pressureless sintering on the metal cylinder; the carcass powder is added into a cold pressing die cavity; feeding the sintered metal cylinders into a cold pressing die cavity, arranging the metal cylinders in the cold pressing die cavity according to a second rule, and inserting the metal cylinders into the matrix powder; carrying out cold pressing treatment on the carcass powder and the metal cylinder to obtain a bead string working layer; and hot-pressing and sintering the bead working layer to obtain the diamond bead.

Provided is a zirconia sintered body with which both transparency and fracture toughness value can be achieved at high levels and which can be easily manufactured even by pressureless sintering. In this sintered body, the percentage content of Y2O3 in the whole composition is 1.7-2.9 mol%, the area average particle diameter of zirconia crystal particles is 0.6-1.1 μm, the area ratio of a first region composed of zirconia crystal particles having a particle diameter of 0.1 or more and less than 0.8 μm is 10-80%, the area ratio of a second region composed of zirconia crystal particles having a particle diameter of 0.8-3.2 μm is 20-90%, the average Y2O3 concentration C2 of zirconia crystal particles forming the second region is 2.0-3.2 mol%, the average Y2O3 concentration C1 of zirconia crystal particles forming the first region is 1.7-2.3 mol%, and when the difference in Y2O3 concentration is defined as ΔC≡C2-C1, the ΔC / C2 value is 0.1-0.5, the fracture toughness value of the sintered body measured by the IF method is 10.5 MPa·m0.5 or more, and the total light transmittance of the sintered body is 40% or more.

The application relates to the technical field of ceramic wave-transparent materials, in particular to a Si3N4 ceramic wave-transparent material and a preparation method thereof. The Si3N4 ceramic wave-transparent material is prepared by mixing alpha Si3N4 powder, a composite sintering aid, a DMAA gel system component and water to prepare Si3N4 slurry, carrying out gel solidification on the Si3N4 slurry to obtain a wet blank, and then carrying out segmented drying, degreasing and pressureless sintering to obtain the Si3N4 ceramic wave-transparent material. The Si3N4 ceramic wave-transparent material prepared by the application has high compactness, low dielectric constant (epsilon=2.8-3.5), low dielectric loss (tan delta <=5*10 ‑3 -6), excellent wave-transparent performance and high-temperature mechanical performance, and is suitable for large-scale preparation of high-temperature wave-transparent scenes such as aerospace and radar antenna covers.

This invention discloses a method for preparing and applying a top metal layer on a power semiconductor chip, relating to the field of power semiconductor interconnect technology. The method includes: coating a metal sintering material onto the top of a power semiconductor chip or wafer, followed by sintering; when the sintering is pressure sintering, baking the metal-coated power semiconductor chip or wafer at a first temperature; after baking, covering the surface of the baked metal sintering material with an insulating material, and then performing pressure sintering at a second temperature; when the sintering is pressureless sintering, performing pressureless sintering of the metal-coated power semiconductor chip or wafer at a third temperature; the first temperature is lower than the second and third temperatures; the thickness of the metal sintering material coating is 1~1000μm; the wafer is an uncut power semiconductor chip precursor. The technical solution provided by this invention is simple and low-cost.

According to the cerium oxide target material and the preparation method thereof provided by the invention, cerium oxide powder with the particle size of 10-500 m is placed in a mold and transferred into a pressureless sintering environment for pressureless sintering treatment, and the cerium oxide target material is obtained; wherein the pressureless sintering treatment adopts multi-stage stepped heating, and comprises the following steps: a low-temperature heating stage: heating from room temperature to 300-400 DEG C, and keeping the temperature for 2-4 hours; in the medium-temperature heating stage, the temperature is increased to 700-800 DEG C from 300-400 DEG C, and heat preservation is conducted for 2-4 hours; and in the high-temperature heating stage, the temperature is increased to 1100-1500 DEG C from 700-800 DEG C, and heat preservation is conducted for 2-7 hours. Cerium oxide powder with the particle size of 10-500 m is placed in a mold for pressureless sintering treatment, the pressureless sintering treatment adopts a multi-stage stepped heating mode, the cerium oxide target material with the high density of 80%-95% can be prepared, the target material is not prone to cracking, and the good large-scale application prospect is achieved.

This invention discloses a copper-based powder metallurgy friction plate for wind turbine torque limiters and its preparation method. The friction plate blank is first subjected to pressureless sintering to obtain a pre-sintered blank, and then the pre-sintered blank is re-pressed to obtain a re-pressed friction plate blank. The re-pressed friction plate blank is then assembled with a copper-plated steel backing to obtain a composite blank, which is then subjected to pressure limiting sintering to obtain the final product. The preparation method of this invention, through the synergy of pressureless pre-sintering, re-pressing, and pressure limiting sintering, obtains a copper-based powder metallurgy friction plate for wind turbine torque limiters with small deformation, high density, and excellent mechanical and tribological properties.

The utility model belongs to the technical field of sintering furnaces, and discloses a pressureless sintering furnace. The non-pressure sintering furnace comprises a furnace body, a heating rod, a baffle and a furnace door, a sintering cavity is formed in the furnace body, an opening communicated with the sintering cavity and the outside is further formed in one side of the furnace body, the heating rod is detachably arranged in the sintering cavity, the baffle is detachably installed in the sintering cavity and used for shielding the heating rod, and the furnace door is movably connected to one side of the opening of the furnace body. The cover is used for blocking or opening the opening. According to the non-pressure sintering furnace, the detachable baffle is arranged in the sintering cavity of the non-pressure sintering furnace and used for shielding and protecting the heating rod exposed in the sintering cavity, collision between a sintered product and the heating rod in the sintered product taking and placing process is avoided, and the heating rod is effectively prevented from being damaged in the sintered product taking and placing process; and when the heating rod is damaged due to other reasons and needs to be maintained or replaced, the baffle can be detached from the sintering cavity, and maintenance or replacement of the heating rod can be conveniently achieved.

The present application belongs to the technical field of processing silicon carbide ceramic material, and particularly relates to a gel connection method for pressureless sintering silicon carbide. The gel connection method for pressureless sintering silicon carbide uses a first mold and a second mold to prepare a silicon carbide product through pouring connection and pressureless sintering. According to the slurry solidification shrinkage-time curve, the method of the present application more scientifically and reasonably performs gel connection, uses gel injection molding to complete connection and re-induction during the reaction period, and eliminates the oxygen block polymerization layer. Meanwhile, the drying and pressureless sintering process of two-zone temperature control is adopted, according to the characteristics that the heat flow is always upward, a certain hysteresis is set for the upper zone temperature control than the lower zone, temperature uniformity is realized, stress is released, the shrinkage of each zone is consistent, the connection layer is uniform, the finished product is defect-free, and the method has the characteristics of easy operation and simple process. The method of the present application has high efficiency and simple operation, and has great application prospect in the connection of large-size silicon carbide ceramic parts.

This invention discloses a low-temperature pressureless sintering copper paste and its sintering process, relating to the field of copper paste sintering technology. By mass percentage, it comprises the following components: 30%–80% nano-silver-coated copper powder, 10%–60% flake-shaped submicron copper powder coated with an organic solderable protective agent, 3%–25% resin binder, and 0.5%–5% additives. The nano-silver-coated copper powder has a core-shell structure, with nano-copper particles as the core. Simultaneously, the nanoscale silver shell layer possesses extremely high surface energy and atomic mobility. Its sintering initiation temperature is as low as 150–200°C, far lower than the sintering temperature of copper, providing a low-temperature sintering driving force for the copper paste. This allows the copper paste to complete pressureless sintering in the low-temperature range of 250–400°C, avoiding damage to thermistor electronic components from high temperatures. The copper paste of this invention combines oxidation resistance, low-temperature sintering capability, high conductivity, and economy, making it suitable for the field of power electronics packaging.

This application discloses a method for preparing high-strength and high-toughness ZTA ceramics from multi-graded powder, relating to the field of structural ceramic preparation technology. The method includes: preparing raw materials by mixing four-particle-graded ZTA-based powder, yttrium oxide-cerium dioxide composite sintering aid, DMAA gel system, dispersant, initiator, and deionized water in parts by mass; followed by powder pretreatment, gel slurry preparation, casting and curing, degreasing treatment, and three-stage pressureless sintering to obtain the finished ZTA ceramic product. This application achieves close particle packing through a four-particle-graded structure based on the Dingle model, achieves uniform molding using a low-toxicity DMAA gel system, and controls grain growth through a three-stage sintering process, ultimately obtaining high-strength and high-toughness ZTA ceramics suitable for waste incineration power generation, biomedicine, semiconductor packaging, and other fields.

The application provides a low-temperature pressureless sintering type silver paste, a preparation method and application thereof, and comprises the following raw materials in percentage by mass: 87-94% of binder-coated silver particles, 4-11% of an organic solvent system, and 1-2% of resin; the binder is one or more of long-alkyl-chain organic substances or aromatic compounds. The binder is used to coat the silver particles to form a steric hindrance effect, which can improve the stability of the silver particles, make the silver paste have good fluidity and storage property, improve the activity of the silver particles, thereby reduce the sintering temperature, meet the need of low-temperature sintering, and avoid hidden dangers caused by pressure on the device in the sintering process without applying additional pressure; in addition, the crosslinking agent of the organic solvent system can crosslink with the binder-coated silver particles, connect linear or branched polymer molecules into a three-dimensional network structure, and further improve the stability and activity of the silver particles.

The application belongs to the technical field of high-entropy materials, and discloses a composite ceramic of Cr2O3-coated high-entropy pyrochlore and a preparation method and application thereof. 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Sc 0.2 )2Zr2O7, wherein x is 5-20 wt.%; the composite ceramic is prepared by the following steps: sintering lanthanum oxide, neodymium oxide, samarium oxide, gadolinium oxide and zirconium oxide at 1400-1700 DEG C to obtain high-entropy pyrochlore powder, stirring the high-entropy pyrochlore powder in a CrCl3 solution after ball milling, drying to obtain CrCl3-coated high-entropy pyrochlore powder, cold sintering the CrCl3-coated high-entropy pyrochlore powder at 200-400 DEG C and 200-500 MPa, then heat preservation at 800-900 DEG C, and then pressureless sintering at 1500-1700 DEG C. The composite ceramic has high density, excellent radiation resistance and leaching resistance, and can be applied in the field of nuclear waste solidification.

The application discloses two kinds of copper powder with micron copper sheet densely coated by nano-particle copper powder, a preparation method of the copper powder and application of the copper paste, and belongs to the technical field of copper powder. The two kinds of copper powder with micron copper sheet densely coated by nano-particle copper powder are composed of micron copper sheets with a length of 1-2 microns and nano copper particles with two particle diameters of 5-15 nm and 40-100 nm. The micron copper sheet is completely and tightly wrapped by the nano copper particles with the two particle diameters, and the nano copper particles with the particle diameter of 5-15 nm are tightly coated around the nano copper particles with the particle diameter of 40-100 nm. The copper powder is prepared by a two-step process one-time synthesis method, the copper powder is mixed with an organic solvent and stirred to prepare a copper paste, the obtained copper paste can promote copper particles to realize sintering and organization densification under low-temperature sintering and obtain a high-strength interconnection structure, and is suitable for low-temperature pressureless sintering interconnection packaging of power chips and power devices.

This invention discloses a zirconium boride dispersion-reinforced fine-grained tungsten sintered billet. The billet consists of a tungsten matrix and zirconium boride particles dispersed within the tungsten matrix, exhibiting a dual distribution state of intragranular and grain boundary dispersion. The average grain size of the tungsten matrix is ​​no greater than 40 μm, the average grain size of the zirconium boride particles is no greater than 2 μm, and the relative density of the sintered billet is no less than 94%. A semi-coherent metallurgical bonding transition layer with a thickness of no less than 1.5 nm is formed between the zirconium boride particles and the tungsten matrix. This invention also provides a method for preparing this sintered billet, which involves long-time wet ball milling, short-time dry ball milling, combined with cold isostatic pressing and pressureless sintering. The doped tungsten prepared by this invention achieves uniform dispersion of zirconium boride particles and grain refinement of the tungsten matrix. The process is controllable, the interfacial bonding is excellent, and the prepared sintered billet has a fine microstructure and uniform dispersion of the dispersed phase, overcoming the defects of uneven dispersion of the traditional tungsten reinforcing phase, coarsening of grains, and weak interfacial bonding.

The invention discloses a low-cost high-tungsten-high-entropy alloy armor-piercing bullet core material, the chemical formula is Wx. (HEA) y, x and y respectively correspond to molar percentage values of W and HEA, and x: y = (1.5-9): 1; the preparation method comprises the following steps: 1, carrying out suspension smelting and vacuum gas atomization to obtain high-entropy alloy spherical powder; 2, mixing with tungsten powder to obtain mixed powder; 3, performing cold isostatic pressing to form a compact green body after pre-pressing molding; 4, performing pressureless sintering to obtain a compact sintered body; and 5, solid solution and rotary swaging treatment. The ratio of tungsten to the high-entropy alloy is controlled to control the formation of a hot shear zone, and the armor-piercing shell core material with high penetration capacity is obtained; based on powder mixing, cold isostatic pressing, pressureless sintering and solid solution and rotary swaging treatment processes, densification and strengthening of the material are achieved step by step, the high-tungsten armor-piercing bullet core material with high density and uniform component tissue is obtained, the comprehensive performance is improved, and the high-tungsten armor-piercing bullet core material is suitable for batch production.

The invention belongs to the technical field of thermal protection materials, and discloses a lightweight ablation-resistant thermal protection material 3D Cf / (Hf, Zr) C-SiC and a preparation method thereof. The composite material is a 3D carbon fiber reinforced silicon carbide-hafnium zirconium carbide composite material, and hafnium zirconium carbide exists in the form of a solid solution. The preparation method comprises the following steps: (1) mixing ZrSi2 powder, HfSi2 powder, C powder, a dispersing agent, absolute ethyl alcohol and grinding balls, and carrying out ball milling; (2) putting a 3D carbon fiber preform into the ball-milled slurry, firstly performing vacuum impregnation, then performing pressure-maintaining impregnation in an inert atmosphere, taking out and drying, and performing cyclic impregnation for multiple times; and (3) carrying out low-temperature pressureless sintering on the impregnated 3D carbon fiber preform to obtain the 3D Cf / (Hf, Zr) C-SiC composite material. The low-density 3D Cf / (Hf, Zr) C-SiC composite material is prepared, and the technical problems that an ultra-high-temperature ceramic-based material is large in density and light-weight design is difficult are solved.