18 results about "Pressureless sintering" patented technology

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.

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 application discloses a SiC water-based granulation powder composite formula for high-activity pressureless sintering, and belongs to the technical field of silicon carbide ceramic powder formula. In view of the industry pain points of a large amount of traditional granulation formula additive doping, high impurity content, difficulty in densification of pressureless sintering, and easy cracking and powder dropping of granulation particles, the formula takes high-purity alpha-SiC as a matrix, is matched with amino sulfonic acid-PEG double-effect compound dispersant, PVA-acrylic acid composite toughness binder, rare earth-boron compound low-temperature sintering additive, and is supplemented with silane coupling agent and rare earth modified additive to optimize interface bonding. The formula component has excellent compatibility, the powder has excellent dispersibility in water phase and is not stratified for a long time; the sintering additive has low addition amount and does not introduce harmful impurities, can significantly reduce the activation energy of SiC pressureless sintering, promotes liquid phase migration and pore elimination of a crystal boundary, and the prepared granulation powder has high forming strength and good storage stability, and is suitable for mass production of pressureless sintering SiC semiconductor ceramics and high-temperature-resistant structural parts.

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.

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 discloses a kind of high expansion heat-conducting ultra-low temperature sintered glass composite material and preparation method thereof, belong to electronic packaging material technical field.The composite material is composed of titanium boron silicon glass (T-BS) matrix (93-100wt%) and flaky hexagonal boron nitride (h-BN) / flaky alumina filler (0-7wt%), T-BS glass chemical composition is 25-28%, 9-13%, 0.5%, 32-34.5%, 2.5%, 10-20%, 1-10%, 1%, 2-10%, 1.5%.Composite material thermal expansion coefficient 15-17× / ℃, thermal conductivity coefficient 1.04-1.12W / (m·K), bending strength 60-100MPa, can be sintered in ≤540℃ air without pressure, resistant to acidic electroplating liquid corrosion.Preparation method includes glass powder preparation, composite powder mixing, dry pressing / casting forming and low temperature sintering, process is simple, low in cost.The application solves the problems of insufficient expansion coefficient, poor thermal conductivity, high sintering temperature and poor corrosion resistance of existing high expansion inorganic substrate, and is suitable for semiconductor packaging adapter plate, high thermal conductivity substrate and ULTCC component manufacturing.

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 application discloses a preparation process of low-agglomeration SiC water-based granulation powder suitable for pressureless sintering, and belongs to the technical field of silicon carbide powder granulation. In view of the defects of the existing water-based granulation process, such as hydrophilic agglomeration of SiC powder, poor stability of slurry, insufficient sintering activity of granulation powder and inability to meet the densification requirement of pressureless sintering, the micron-sized SiC powder is first subjected to surface modification by using argon-oxygen mixed plasma to control the polarity of the surface hydrophilic group; then, an environmentally-friendly water-based system slurry is prepared, and full-component uniform dispersion is realized by combining graded variable-particle-size SiC grinding balls and intermittent temperature control ball milling; the spray granulation temperature field parameters are optimized, and screening classification and low-temperature inert calcination are matched to remove organic residues. The granulation powder prepared by the process has high sphericity, excellent fluidity and extremely low agglomeration rate, the uniformity of the mixture of the powder and sintering additives is greatly improved, the initial temperature of pressureless sintering is significantly reduced, and the holding time is shortened, and finally, the density of the pressureless sintered SiC ceramic is greater than or equal to 96%, and the process is suitable for large-scale production of semiconductor structure ceramics.

The present application relates to the field of environmental barrier coatings or integrated thermal environmental barrier coatings, and particularly relates to a yttrium-holmium-erbium-ytterbium non-equiatomic high-entropy rare earth monosilicate ceramic material and a preparation method thereof. x Ho (1‑x) / 3 Er (1‑x) / 3Yb (1‑x) / 3 )2SiO5, wherein the atomic molar amount x of Y ranges from 0.05 to 0.95. The yttria powder, holmia powder, erbium oxide powder, ytterbia powder and silica powder are used as raw materials, wet mixing is performed, pressureless sintering is performed in an air atmosphere, and then sintering is performed in a hot-pressing furnace with a protective atmosphere, so that the high-entropy rare earth monosilicate ceramic material with high purity and excellent high-temperature thermal physical properties is obtained.

The application provides a silicon nitride ceramic and a pressureless sintering method and application thereof, and belongs to the technical field of ceramic materials. The application uses yttrium aluminum garnet and magnesium oxide as sintering aids, controls the sintering temperature and time of the yttrium aluminum garnet, reduces the formation of the subcrystal phase YAP, can provide more sintering power for the pressureless sintering process of the silicon nitride ceramic, can promote the sintering densification of the silicon nitride ceramic at a lower liquid phase formation temperature, and simultaneously adds neodymium oxide, so that the silicon nitride ceramic prepared by pressureless sintering simultaneously has excellent hardness, strength and fracture toughness.

This invention relates to a method for preparing high infrared transmittance MgAlON ceramics, belonging to the field of ceramic preparation. The method for preparing high infrared transmittance MgAlON ceramics involves ball milling and mixing 86.2-86.6 wt.% γ-Al₂O₃, 8.6 wt.% MgO, and 4.8-5.2 wt.% carbon black, followed by carbothermic reduction nitriding to synthesize pure-phase MgAlON powder with an O / N value of 9.5-12.0. CaCO₃ is added to the pure-phase MgAlON powder as a sintering aid, and after ball milling, a MgAlON / CaCO₃ mixed powder is obtained, which is then dry-pressed to prepare a green body. Finally, high infrared transmittance MgAlON ceramics are prepared using a pressureless sintering method. This method designs the composition of raw material powder and controls the degree of nitridation of MgAlON powder. Then, using this powder as raw material, MgAlON transparent ceramics are prepared by pressureless sintering under short holding time conditions. The raw materials are readily available and inexpensive. The MgAlON powder prepared has good sintering performance, and the MgAlON transparent ceramics have high infrared transmittance, good energy-saving effect, and high efficiency. It is not only low in cost, but also simple and easy to implement, making it suitable for industrial production.

This invention relates to a rapid pressureless sintering preparation method for broadband high-transmittance AlON ceramics, belonging to the field of transparent ceramic material preparation. The invention involves ball milling and mixing Y₂O₃ raw material powder and AlON raw material powder to obtain an AlON / Y₂O₃ mixed powder; then, the AlON / Y₂O₃ mixed powder is pressurized to obtain a green body; finally, the green body is pressureless sintered to obtain broadband high-transmittance AlON transparent ceramics. In the AlON / Y₂O₃ mixed powder, Y₂O₃ powder is uniformly distributed in the mixed powder in the form of single particles and clusters composed of 2-5 and 6-60 single particles, with the mass of the Y₂O₃ powder in the form of clusters of 6-60 single particles being 50%-80% of the total Y₂O₃ raw material powder. This invention is simple to operate, has a short pressureless sintering holding time, high efficiency, good energy-saving effect, and low cost. Furthermore, the prepared AlON ceramics exhibit high transmittance in both the visible and infrared bands, making it suitable for industrial production.

The application discloses a preparation process optimization method and device of diamond reinforced metal matrix composite, and relates to the technical field of composite preparation.The method comprises the following steps: performing double-plating layer surface metallization modification treatment on diamond particles to form a composite plating layer; mixing to-be-mixed powder and to-be-mixed matrix powder according to a preset ratio to obtain a composite matrix powder, uniformly mixing the composite plating layer and the composite matrix powder to form mixed raw materials; performing real-time recording of pressureless sintering to generate a preparation record log, feeding back and optimizing sintering process parameters to generate sintering optimized process parameters; and reconfiguring alloying treatment parameters to adjust the sintering process parameters of subsequent batches of mixed raw materials, so that the diamond reinforced metal matrix composite is prepared.The technical problem that the material performance is unstable due to insufficient bonding strength of diamond and a metal matrix in the prior art is solved, and the technical effect of improving the performance of the diamond reinforced metal matrix composite is achieved.

This invention provides a titanium niobium oxide coating material, its preparation method, and its application. The preparation method includes the following steps: mixing titanium pentoxide, niobium pentoxide, a binder, a thickener, and a solvent to obtain a slurry; spray granulating the slurry to obtain powder with a particle size D50 of less than 45 μm; after debinding, the obtained powder is cold isostatically pressed into a green body, which is then crushed to obtain crushed particles; the crushed particles are then pressureless sintered to obtain the titanium niobium oxide coating material. The preparation method provided by this invention can obtain a titanium niobium oxide coating material with high purity, high density, uniform particle size, and high yield.

The application discloses a kind of high solid content low viscosity SiC ceramic double solidification slurry and low shrinkage green body preparation method, it is related to SiC ceramic additive manufacturing technical field.For solving the problem of existing slurry solid content low, viscosity high, green body shrinkage big, green body strength low, the modified SiC powder of surface in-situ growth SiO2 / phenolic resin composite core-shell is used in the present application, with photosensitive resin and thermal gel matrix, build double solidification slurry system;After photo-curing layering, thermal gel secondary reinforcement, ladder debinding and pressureless sintering, obtain low shrinkage, high strength SiC green body and dense ceramic.The application realizes slurry solid content 65~72vol%, viscosity≤1200mPa·s, green body linear shrinkage rate≤8%, green body strength≥8MPa, and is suitable for semiconductor precision ceramic component additive manufacturing.

The present invention provides a paste composition for pressureless sintering bonding that does not require pressurization and utilizes only thermal energy, a bonding method, and an electronic component manufactured by bonding. [Solution] A paste composition for pressureless sintering bonding comprising silver nanoparticles; silver nanoparticle aggregates; and a mixed solvent comprising an alcohol-based solvent and an ether-based solvent; a bonding method comprising the step of applying the pressureless sintering bonding paste composition of the present invention to a bonding surface and heating the objects to be bonded to the bonding surface at a pressure of 1 atm and a temperature of 150 to 300°C; and an electronic component manufactured by bonding using the pressureless sintering bonding paste composition of the present invention.