6 results about "Barium tetraborate" patented technology

The invention belongs to the technical field of special ceramic preparation, and particularly relates to high-strength special ceramic and a preparation method thereof. The high-strength special ceramic is prepared from the following raw materials: alumina powder, quartz powder, serpentine, phosphorus slag, eucryptite, barium borate, nano yttrium trifluoride, nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane. According to the high-strength special ceramic disclosed by the invention, the aluminum oxide powder, the quartz powder, the serpentine and the phosphorus slag are taken as matrix raw materials, eucryptite, barium borate and yttrium trifluoride are taken as fluxing agents, and nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane are taken as fillers, so that the prepared special ceramic has excellent bending strength and fracture toughness.

This invention discloses a barium borate crystal, its preparation method, and its applications. The barium borate crystal has the chemical formula Ba₂BeB₂O₆, a non-centrosymmetric structure, belongs to the orthorhombic crystal system, has the space group Pca₂₁, and its cell parameters are α = 90°, β = 90°, and γ = 90°. This barium borate crystal exhibits extremely low birefringence from the ultraviolet to the infrared band, and its extremely low birefringence supports its application on zero-order glass slides.

The application belongs to the field of composite materials, and provides a preparation method of a composite material of barium borate as a skeleton loaded with glycerol monostearate, GMS is dispersed in deionized water, heated and stirred, and then cooled to room temperature to form a suspension, barium nitrate and sodium tetraborate are dispersed in deionized water and stirred by a magnetic stirrer; the GMS suspension is added dropwise into the sodium tetraborate solution and stirred uniformly, the barium nitrate solution and the PEG-200 solution are added dropwise into the GMS and sodium tetraborate mixed solution in sequence and stirred uniformly, and then poured into a hydrothermal kettle for hydrothermal treatment; after hydrothermal treatment, the product is naturally cooled to room temperature, centrifuged or suction filtered, and the precipitate is washed with deionized water to obtain a BaB / GMS / PEG composite material. The product has excellent tribological properties. The preparation method of the composite material of barium borate as a skeleton loaded with glycerol monostearate has the advantages of simple synthesis process and green and environmentally-friendly reaction.

The invention belongs to the technical field of optical crystal materials, and particularly relates to a melamine fluorosulfonate nonlinear optical crystal and a growth method and application thereof. The preparation method comprises the following steps: taking C3N6H6 and HSO3F as raw materials to prepare a melamine fluorosulfonate compound; and enabling the melamine fluorosulfonate crystal to directionally grow on the surface of the seed crystal by adopting a top seed crystal method to obtain the melamine fluorosulfonate nonlinear optical crystal. The spatial arrangement and the group density of a pi-conjugated [C3N6H8] group are effectively adjusted by using a fluorosulfonic acid group, and meanwhile, the compound has a relatively large frequency-doubled effect, a short ultraviolet cut-off edge and proper birefringence (0.064 at-1064nm), and can realize direct frequency-doubled output of short-wavelength ultraviolet laser. Compared with beta-barium borate, the birefringence of the material is reduced by about 44%, the walk-off effect is effectively avoided, and the material has application prospects in all-solid-state 266 nm ultraviolet lasers.

The invention discloses dysprosium-doped barium borate yellow fluorescent powder as well as a preparation method and application thereof, and belongs to the technical field of luminescent materials. According to the invention, barium borate (Ba3B2O6) is taken as a substrate, and a series of Dy < 3 + >-doped yellow fluorescent powder Ba3B2O6: xDy < 3 + > with different concentrations are successfully prepared through a high-temperature solid-phase method, and x is 0.01-0.10. The prepared Dy < 3 + >-doped yellow fluorescent powder is combined with nitride red powder (CaAlSiN3: Eu < 2 + >, the main peak is 630 nm) and an ultraviolet LED chip (365-375 nm) to prepare a warm white LED with high color temperature and high color rendering index, and the defects that commercial yellow fluorescent powder lacks a cyan area under blue excitation and has blue light hazards can be overcome.

The invention discloses a preparation method of an advanced screen display ZnO-Al2O3-SiO2-based glass substrate, and belongs to the technical field of novel preparation processes of screen display glass materials. According to the technical scheme, the method is characterized in that ZnSiO3 and Al2 (SiO3) 3 are selected as glass melting raw materials, one or more of calcium borate or barium borate is selected as a cosolvent, the raw materials can be completely melted and reacted at 1260 DEG C, and the temperature of the raw materials is far lower than that of conventional oxide preparation; the clarifying agent is selected from one or more of cerium dioxide, barium sulfate, calcium sulfate or zirconium oxide, and the auxiliary materials not only serve as the clarifying agent, but also play a role of a nucleating agent in the glass crystallization process, so that sufficient use and compatible chemical effects of additives are formed, and excessive introduction of impurities is avoided. The clear glass clarification time and temperature treatment process are beneficial to regulation and control of crystallization degree and hardness, and the stability of the substrate in the process of preparing the TFT-LCD on the substrate glass in the later period is guaranteed.