6 results about "Solid solubility" patented technology

This application discloses a perovskite-structured high-entropy ceramic material with excellent dielectric temperature stability. The chemical formula of the high-entropy ceramic material is (Ca... 0.2 Sr 0.2 Ba 0.2 Mg 0.2 Bi 0.1 Na 0.1 (Ti1) x Zr x O3, x=0.05~0.2. This application employs an A-site high-entropy material composition design that enables elements to break through the solid solution limit, achieving greater solid solubility in the material system. By using Zr 2+ Ti at the B site in ion-substituted ceramics 2+ The composition design approach successfully achieved B-site ion doping, resulting in well-grown, dense grains within the ceramic. The sample microstructure exhibited few pores, with elements uniformly distributed throughout the ceramic without agglomeration. By optimizing and controlling the ceramic's microstructure, the dielectric ceramic obtained in this application possesses a high dielectric constant and excellent temperature stability, with capacitance-temperature variations meeting both X7R and X6R capacitor standards.

Neutron shielding comprising a metal-hydride metal composite: the metal-hydride metal composite comprising: a metal matrix; and a plurality of metal-hydride particles dispersed within the metal matrix; wherein, the fraction of metal-hydride in the metal-hydride metal composite is at least 1 mol % and the volume fraction of metal-hydride in the metal hydride metal composite is no higher than the ratio of the solid solubility limit of hydrogen in the metal matrix and the molar fraction of hydrogen in the metal-hydride.

This invention discloses a long-life, ablation-resistant hafnium-zirconium-based multi-component boride high-solid-solution, low-oxidation coating for carbon materials and its preparation method, mainly addressing the problems of low solid solubility, easy oxidation, and poor ablation resistance of existing coatings. The method includes: 1) uniformly mixing HfB2, ZrB2, TaB2, and TiB2 powders at a specific molar ratio and processing to obtain mixed ceramic powder; 2) mixing the ceramic powder, deionized water, ethanol, and 2wt.% PVA solution at a certain mass ratio and ball milling to obtain a mixed slurry; 3) setting relevant parameters and spray granulating the slurry to obtain boride powder; 4) subjecting the powder to inductive plasma spheroidization to obtain a solid solution powder; 5) spraying the solid solution powder onto a carbon substrate via vacuum plasma to form an ablation-resistant coating with low oxygen content and high solid solubility. The coating of this invention exhibits good solid solubility and low oxidation, effectively improving the service life of the boride ceramic coating on carbon materials.

This application discloses a high corrosion-resistant, non-magnetic austenitic stainless steel, its preparation method, and a wearable device, relating to the field of metal powder metallurgy technology. The stainless steel, by mass percentage, comprises: Cr: 22%–27%, Mn: 5%–9%, ​​Ni: 5%–9%, ​​Mo: 3%–7%, N: ≥0.6%, with the balance being Fe and impurities; its matrix microstructure is a single-phase austenite with supersaturated dissolved nitrogen. The preparation method includes mixing and granulation, injection molding, degreasing, vacuum sintering for densification, and solid-phase nitriding in a nitrogen-containing atmosphere with a nitrogen partial pressure of 4080 kPa during the cooling stage after sintering (1250–1100 °C). This application solves the problems of low nitrogen solid solubility and easy precipitation of brittle phases leading to decreased corrosion resistance and excessive magnetic properties caused by atmospheric pressure smelting by using a high-chromium composition system combined with a high-pressure nitriding process in the cooling stage. It achieves excellent properties that combine high strength, high hardness, high corrosion resistance, and complete non-magnetism, while reducing the nickel content and minimizing the risk of allergies.

The application discloses an Al-Fe-Mn heat-resistant high-strength rare earth reinforced aluminum alloy and a preparation method thereof, and belongs to the field of additive manufacturing technology.The aluminum alloy comprises Fe, Mn, Y, Sm, Er, V and Si in a mass percentage of 0.5-3 wt%, 0.5-2 wt%, 0.01-0.3 wt%, 0.05-0.2 wt%, 0.01-0.1 wt%, 0.01-0.3 wt% and 0.02-0.5 wt% respectively, and the balance is Al.The Y, Sm and Er rare earth elements are added to maintain the high-temperature stability of Al-TM particles, and the Mn and Fe elements are added to form a large number of dispersed distribution and heat-stable precipitated phases under the condition of the rapid cooling of 3D printing, so that the heat-resistant performance of the aluminum alloy is improved, and the solid solution strengthening effect can be achieved, and the problem of low solid solubility of a traditional Al-TM alloy is solved.

The application discloses nitrogen-doped high-entropy alloy powder and a preparation method thereof. In order to solve the problems of low gap nitrogen solid solubility, easy precipitation of brittle metal nitride and uneven composition in the existing physical nitriding technology, the application adopts anhydrous metal halide, alkali metal amide and alkali metal azide as a reaction precursor. In the process of closed heating reaction, the amide is melted to provide a continuous liquid phase mass transfer medium; the azide is decomposed to release alkali metal and local high-pressure nitrogen gas; the alkali metal drives the metal halide to co-reduction; in the initial stage of nucleation and growth, the multi-component metal atoms are combined with the amino free radicals and high-pressure nitrogen gas in the system to directly embed nitrogen atoms into the lattice gap position, and high-concentration in-situ solid solution doping is completed. The application avoids the diffusion resistance of gas molecules in the traditional gas-solid nitriding, and realizes the preparation of alloy powder with high purity, uniform phase and no precipitation of brittle metal nitride.