45 results about "Salt ceramic" patented technology

The invention relates to the technical field of high-entropy ceramic materials, and particularly provides high-entropy rare earth niobium / tantalum / molybdate ceramic and a preparation method thereof. The chemical formula of the high-entropy rare earth niobium / tantalum / molybdate ceramic is RE3(Nb1 / 3Ta1 / 3Mo1 / 3)O7, RE is any 3-7 different elements of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb and Lu. The preparation method comprises the following steps of (1) weighing rare earth oxide, niobium pentoxide, tantalum pentoxide, molybdenum trioxide and molybdenum dioxide according to a stoichiometric ratio, (2) adding a solvent and a ball-milling medium, ball-milling and mixing the raw materials by adopting a wet method, and carrying out vacuum drying and sieving to obtain uniformly mixed powder, (3) placing the uniformly mixed powder in a stainless steel mold for hydraulic compaction, and then carrying out cold isostatic pressing to obtain a densified green body, and (4) putting the green body into an alumina crucible, putting the alumina crucible into a high-temperature sintering furnace, and sintering in an air atmosphere. The prepared high-entropy ceramic is low in heat conductivity, the adopted preparation method has the advantages of being simple and rapid in process, low in equipment requirement, low in energy consumption, high in controllability and the like, and large-scale production is easy to achieve.

The invention discloses a soluble salt ceramic tile and a production method thereof. The method comprises the following steps: (1) preparing ceramic tile powder for later use by a conventional method; (2) preparing a water-soluble soluble salt ink for the soluble salt ceramic tile; (3) preparing surface paste of the soluble salt ceramic tile; (4) preparing a ceramic tile green compact; (5) drying; (6) applying the surface paste; (7) carrying out ink-jet printing; (8) drying and firing; (9) edging; and (10) sorting, packaging and warehousing. The invention solves the following problems in the soluble salt ceramic tile production process in the prior art: the pattern obtained by the soluble salt technique does not have bright and abundant colors; in the subsequent polishing process, the consumption of the grinding material, energy sources and industrial water is high, and abundant polishing waste is generated, thereby influencing and polluting the environment; and the soluble salt ceramic tile has high requirements for the green compact raw materials, thereby causing increase of production cost and great waste of resources. The production method disclosed by the invention is more environment-friendly and economic, and has more abundant decorative effects.

The invention relates to the technical field of thermal barrier coatings, and particularly discloses an A2B2O7 type rare earth tantalate ceramic and a preparation method thereof. The preparation method comprises the following steps: respectively dissolving RE2O3 and M2O3 into concentrated nitric acid according to the structural formula of RE2MTaO7 to react and adjusting the pH value to be not lessthan 1.5, dropwise adding a TaOCl3 solution, continuously stirring, adding ammonia water to stabilize the pH value of the system at 9-10, continuously stirring in a water bath environment, washing the precipitate with deionized water until the pH value is 7, drying the obtained filter cake in a drying oven, and screening for later use; and placing the powder in a graphite grinding tool, performing spark plasma sintering in a sintering furnace, then performing annealing and carbon removal on a sintered sample to obtain a compact RE2MTaO7 block. The material has the characteristics of low heatconductivity, high hardness, fracture toughness and the like.

The invention discloses a multiferroic titanium-iron-cobalt-nickel acid bismuth salt ceramic material having a six-layer structure and a preparation method thereof. The multiferroic titanium-iron-cobalt-nickel acid bismuth salt ceramic material having a six-layer structure has a chemical formula of Bi7FeCoNiTi3O21. The preparation method comprises that raw materials of Bi2O3, Fe2O3, Co2O3, Ni2O3 and TiO2 are subjected to ball milling, drying, pre-synthesis, further ball milling, drying, molding, binder removal and sintering to form Bi7FeCoNiTi3O21, wherein a mole ratio of Bi2O3, Fe2O3, Co2O3, Ni2O3 to TiO2 is (6 to 6.6): 1: 1: 1: 6. The preparation method provided by the invention adopts a conventional solid phase sintering method, has simple processes and good environmental harmony. Bi7FeCoNiTi3O21 has ferroelectric and ferromagnetic properties at a room temperature, wherein Bi7FeCoNiTi3O21 has remanent polarization (2Pr) of 43 muC / cm<2> when a measure electric field is 390kV / cm and remanent magnetization of 0.95 emu / g.

The invention discloses a method for preparing a porous wollastonite ceramic membrane for membrane distillation desalination through dry pressing by taking blast furnace slag as a main raw material, and belongs to the technical field of desalination. Blast furnace slag is taken as a main raw material, polymethyl methacrylate is taken as a pore-forming agent, the porous wollastonite ceramic membrane is prepared at low cost through dry-pressing solid-phase reaction, polymethylhydrosiloxane is taken as a modifier, hydrophobization treatment is performed on the porous wollastonite ceramic membrane by adopting a pyrolysis method, and the hydrophobic porous wollastonite ceramic membrane can be used for membrane distillation desalination. The method comprises the following steps: uniformly mixing the blast furnace slag with calcium oxide and silicon dioxide, adding a certain amount of polymethyl methacrylate, carrying out ball milling, drying and sieving to obtain a ceramic raw material, tabletting the ceramic raw material into a ceramic membrane blank, and calcining to obtain the wollastonite ceramic membrane with a good porous structure. The wollastonite porous ceramic membrane subjected to hydrophobization treatment can be used for membrane distillation desalination. The ceramic membrane has high water flux, and the desalination rate is close to 100%.

The invention belongs to the technical field of analysis and detection, and particularly discloses a silicate ceramic composition detection method. The method comprises the following steps: firstly, cutting a silicate ceramic sample into blocks, then carrying out epoxy resin embedding treatment on the block-shaped sample, and curing to obtain an epoxy resin polished section; carrying out polishing and carbon spraying on the epoxy resin polished section, and then carrying out measurement by adopting an MLA system to obtain a newly built X-ray energy spectrum list; and arranging and naming a newly-built X-ray energy spectrum list, then carrying out phase classification on measurement data, and then calculating to obtain the mass percent contents of crystalline phase minerals, amorphous phases and pores in the silicate ceramic sample. According to the method disclosed by the invention, the performance of the silicate ceramic can be evaluated by measuring the composition of the silicate ceramic, and a theoretical basis and support are provided for optimizing a ceramic processing technology.

The invention discloses in-situ-synthesized fake binary complex-phase rare earth niobate ceramic and a preparation method thereof. The preparation method comprises the following steps: 1), calcinatingrare earth oxide RE2O3, then mixing with niobium oxide (Nb2O5) by a wet ball milling method, performing rotary evaporative drying, sintering and sieving to obtain presintered powder, grinding the pre-sintered powder by the wet ball milling method, performing rotary evaporation and sieving to obtain fine powder; 2), placing the fine powder in a mould, hydraulically compacting, performing cold isostatic compacting and then secondarily sintering to obtain the fake binary complex-phase rare earth niobate ceramic. By the preparation method, a technology is simple, a product is low in preparation cost and high in purity and is suitable for batch production, and the prepared fake binary complex-phase rare earth niobate ceramic has relatively good thermal properties.

The invention relates to a method for preparing rare earth silicate ceramics by chemical vapor deposition of an oxygen-containing precursor. Rare earth oxides are used as reactants, and CH 3 SiCl 3 As a precursor, CO 2 As an oxygen source, hydrogen as a carrier gas and dilution gas, and argon as a protective gas, rare earth silicate ceramics are obtained through chemical vapor deposition. It can be used to prepare rare earth silicate ceramic powder, and can also be used to prepare rare earth silicate ceramic coating, and rare earth silicate ceramic modified structural ceramics and ceramic matrix composite materials. The preparation temperature of the rare earth silicate ceramics of the present invention is low, which solves the problem that the preparation temperature of the rare earth silicate ceramics is too high. Vapor deposition provides a new method for preparing rare earth silicate ceramics and rare earth silicate modified ceramic matrix composites.

The invention relates to high-temperature-resistant CMAS-corrosion-resistant rare earth silicate ceramic and a preparation method thereof. The ceramic is of a composite ceramic structure compounded by high-entropy rare earth monosilicate and high-entropy rare earth disilicate. The preparation method comprises the following steps: respectively synthesizing RE2O3 and SiO2 into single-phase (xRE1 / x) 2SiO5 powder and single-phase (xRE1 / x) 2Si2O7 powder through a solid-phase reaction method, then compounding the single-phase (xRE1 / x) 2SiO5 powder and the single-phase (xRE1 / x) 2Si2O7 powder according to a certain proportion to form (xRE1 / x) 2SiO5 / (xRE1 / x) 2Si2O7 complex-phase powder, tabletting the powder, and carrying out pressureless sintering to form (xRE1 / x) 2SiO5 / (xRE1 / x) 2Si2O7 complex-phase ceramic blocks; the high-entropy rare earth silicate ceramic with the structure has excellent performances such as good high-temperature CMAS corrosion resistance and the like.

The invention relates to a method for preparing a submicron order rare-earth zirconate ceramic bulk material and belongs to the technical field of inorganic nonmetallic materials. The method comprises the following steps: carrying out a chemical coprecipitation reaction between a nitric acid solution of rare-earth oxides and an aqueous solution of zirconium oxychloride in excessive ammonia water so as to obtain precursor powder; and performing precalcination on the obtained precursor powder, and sintering by utilizing a spark plasma sintering technology, thereby obtaining the rare-earth zirconate ceramic bulk material. According to the method disclosed by the invention, grain growth is inhibited by utilizing the advantages that the spark plasma sintering technology is low in sintering temperature and short in heating time, and the density reaches 92% or higher; and moreover, the method is simple in process and short in preparation cycle, sintering aids are not added, and the high-purity phase ceramic material can be obtained.