7results about How to "Sintered dense" patented technology

The invention discloses nanoscale high-entropy A2B2O7 type oxide ceramic powder and a preparation method of a nano ceramic block of the nanoscale high-entropy A2B2O7 type oxide ceramic powder, and the preparation method comprises the following steps: S1, uniformly dispersing a rare earth element source and a transition metal source in deionized water, stirring at room temperature, and then adding a polymerizing agent and an inducer to obtain a mixed solution; s2, continuously stirring at room temperature to form a transparent clear solution; s3, heating the transparent clarified solution until milk white gel is gradually formed; and S4, drying the milk white gel into dry gel. According to the nanoscale high-entropy A2B2O7 type oxide ceramic powder and the preparation method of the nano ceramic block of the nanoscale high-entropy A2B2O7 type oxide ceramic powder, discharge plasma sintering is combined with a two-step preparation process, the efficiency is high, sintering is compact, the grain size of a ceramic block material can be controlled, and the nano ceramic block can be used for preparing the nano-scale high-entropy A2B2O7 type oxide ceramic powder. And the synthesized oxide has the characteristics of fine powder particle size, uniform distribution, few impurities and the like, and the method is low in synthesis temperature and relatively low in cost.

The invention discloses a method for simultaneously optimizing the squareness and the remanence temperature coefficient of a 2: 17 type samarium-cobalt sintered magnet, and belongs to the technical field of rare earth permanent magnet material preparation. A component Sm < 1-x > RE < x > (CobalFeaCubZrc) z is designed, RE is one or more of Dy, Er, Gd, Tm and other heavy rare earth elements, and a, b, c and x meet the following relations: 0 < = x < = 0.6, 0.1 < = a < = 0.2, 0.06 < = b < = 0.12, 0.02 < = c < = 0.03, and 6.9 < = z < = 7.9. On the basis of a conventional smelting and ingot casting-isothermal annealing-powder preparation-oriented profiling-sintering-solid solution-aging process, an isothermal annealing process is added after smelting and ingot casting: the temperature is raised to 1190-1210 DEG C in a tubular furnace, isothermal annealing is performed for 5-20 hours, heavy rare earth elements are eliminated, and the influence of the stability of a 2: 17H phase on the component uniformity and magnetic performance of a magnet is improved; and substitution sites of heavy rare earth can be increased, and the residual magnetism temperature coefficient is optimized.

The invention belongs to the field of ceramics, and particularly relates to a high-purity silicon carbide ceramic and a preparation method thereof. Comprising the following steps: adding powder into a ball mill, adding deionized water, stirring, and carrying out ball milling to form water-based slurry; the powder is prepared from micron-scale alpha-silicon carbide powder, nano-scale alpha-silicon carbide powder, polyethylene glycol and polyvinyl alcohol which are different in particle size; carrying out spray granulation on the obtained water-based slurry; and adding the obtained granulated powder into a graphite mold in an oscillating hot-pressing sintering furnace, pre-pressing, heating and boosting to a set sintering temperature and a set sintering pressure, and performing oscillating hot-pressing sintering to obtain the high-purity silicon carbide ceramic. By adopting the method, the mechanical property of the high-purity silicon carbide ceramic can be remarkably improved.

The preparation method of the high-performance aluminum oxide ceramic substrate comprises the following steps: S1, mixing and dispersing: carrying out ball milling and dispersing on polyacrylic acid, a sintered core material, a composite adhesive and aluminum oxide to obtain mixed slurry; s2, tape casting, sheet arranging and flattening treatment and rubber discharging are conducted; S3, sintering is conducted, specifically, materials obtained after rubber discharging are fed into a discharge plasma sintering furnace to be heated to the temperature of 1550-1650 DEG C, and heat preservation is conducted for 30-50 min; and S4, cooling: cooling the sintered body to normal temperature. According to the preparation method of the high-performance aluminum oxide ceramic substrate, the obtained ceramic substrate has good mechanical strength.

The application discloses high calcium expanded clinker which can be continuously produced on a rotary kiln and a preparation method thereof. The high calcium expanded clinker is prepared from raw meal powder of 70-90 parts of limestone, 8-24 parts of lapis lazuli and 2-6 parts of aluminum fluoride by calcining at 1200-1300 DEG C on a rotary kiln. The application uses lapis lazuli which is not easy to decompose and rich in sulfur minerals to replace gypsum commonly used in traditional expanded clinker as a sulfur component. With the aid of the mineralization component of aluminum fluoride, the application reduces the risk of ring formation in the kiln caused by the volatilization and condensation of SO3 generated by the decomposition of gypsum on the basis of providing a sulfur phase station, significantly improves the continuity of the calcination production of the expanded clinker on the rotary kiln, greatly ensures the production quality of the expanded clinker, reduces the sintering heat consumption of the expanded clinker, saves the production cost of the expanded clinker, improves the market competitiveness of the expanded clinker, and has a wide application prospect.

The application provides a full-spectrum complex-phase fluorescent ceramic and a preparation method and application thereof. 1‑x‑y Sr y AlSiN3:xEu (0 1‑x‑a‑b Y a Gd b )3(Al 1‑c Ga c )5O 12 :xCe (0 12 The short-time ceramic sintering and the faster temperature rising and falling rate in the application effectively slow down the grain growth in the ceramic sintering process, and in the short-time sintering process, the nitride powder forms the oxide phase in situ without causing large decomposition or sintering so as to make it invalid. In short, through the short-time high-temperature pulse sintering, the sintering densification of the complex-phase ceramic is promoted, and the nitride phase is avoided from being oxidized in the long-time high-temperature process to cause the sharp drop of the luminous efficiency.

The invention provides scintillation ceramic, a high-energy detection array, a detector and a preparation method. The chemical formula of the scintillation ceramic is Gd3Al2-x-yScxGa3O12: yCr < 3 + >. The preparation method comprises the following steps: S01, dissolving Gd2O3, Sc2O3, Ga2O3, NH4Al (SO4) 2.12 H2O and Cr (NO3) 3 in a hot acid solution, dropwise adding the acid solution into an alkali solution for coprecipitation, collecting a precipitate, and washing the precipitate; s02, drying and grinding the precipitate to obtain powder; s03, the powder is pre-sintered; s04, performing grinding, sieving, dry pressing and cold isostatic pressing treatment on the pre-sintered powder; and S05, carrying out primary sintering in an oxygen atmosphere, and carrying out isostatic pressing sintering in an inert atmosphere to obtain the compact ceramic. The garnet scintillation ceramic provided by the invention can realize high absorption intensity and luminous intensity of broadband, and shows good luminous performance and detection efficiency.