6 results about "Barium glass" patented technology

The embodiment of the invention provides a composite resin disc and a preparation method and application thereof. The composite resin disc is prepared from the following raw materials in percentage by mass: 10 to 30 percent of resin matrix, 70 to 90 percent of filler and the balance of functional additive, the filler is a combination of silanized barium glass powder and modified fumed silica; the resin matrix is prepared from the following components in percentage by mass: 5 to 10 percent of bisphenol A-glycidyl methacrylate, 2 to 10 percent of dimethyl acrylic acid carbamate, 1 to 10 percent of dimethyl acrylic acid triethylene glycol ester, 0.1 to 1 percent of hydroxyethyl methylacrylate, 0.1 to 1 percent of methyl methacrylate and 0.1 to 1 percent of methacrylic acid. Through a resin and ceramic synergistic enhancement system and in combination with a gradient curing process, the flexural strength of the obtained composite resin disc reaches 310 MPa or above, the elastic modulus reaches 15 GPa, and nearly zero shrinkage is achieved.

The invention discloses lead-free and barium-free glass powder for PTC (Positive Temperature Coefficient) thermistor paste and a preparation method of the lead-free and barium-free glass powder, and relates to the technical field of electronic functional materials. According to the lead-free and barium-free glass powder for the PTC thermistor paste, CaO-B2O3-SiO2-Al2O3 is taken as a matrix, and Na2O, TiO2, K2O, Li2O, MgO and SrO are added to regulate and control the glass powder; the preparation method comprises the following steps: weighing the raw materials and uniformly mixing to obtain a mixture; the mixture is subjected to high-temperature smelting and heat preservation, a homogenized glass melt is obtained, the homogenized glass melt is poured into water to be subjected to water quenching, and a glass material is obtained; drying and crushing the glass material to obtain glass fragments; carrying out ball milling on the glass fragments to obtain glass powder slurry; and carrying out solid-liquid separation on the glass powder slurry to obtain solid glass powder, and drying and screening the solid glass powder to obtain the lead-free and barium-free glass powder for the PTC thermistor slurry. The glass powder provided by the invention can enhance the combination of conductive particles and the compactness of a film layer, significantly improve the tight combination between the resistive film layer and a 96% Al2O3 substrate, and improve the reliability of PTC thermistor paste.

The application discloses an antibacterial filler with pyroelectric and piezoelectric effects and a dental composite resin and a preparation method, relates to the technical field of dental repair materials, and adopts calcium-manganese co-doped barium titanate as a shell material to coat barium glass powder to form a core-shell structure. The calcium-manganese co-doping realizes the stabilization of the crystal structure of the barium titanate, significantly improves the pyroelectric response capability of the barium titanate at room temperature on the premise of maintaining the tetragonal phase, and makes the barium titanate have excellent pyroelectric and piezoelectric properties. The synergistic effect of the above-mentioned core-shell filler and a resin matrix makes the obtained composite resin be capable of inducing active oxygen under the stimulation of oral temperature cycle change or ultrasonic stimulation, so that a persistent antibacterial effect is realized. The composite material has excellent mechanical properties and good biocompatibility, and is suitable for application scenes with high requirements for antibacterial properties and functions in the field of oral repair.

The invention provides a continuous casting crystallizer function protection material for gear outer ring steel and a preparation method of the continuous casting crystallizer function protection material, and belongs to the technical field of metallurgical materials. The invention relates to a function protection material of a continuous casting crystallizer for gear outer ring steel, which is prepared from the following raw materials in percentage by weight: 32.2 to 35.0 percent of pre-melting material, 22.1 to 25.0 percent of wollastonite, 1.0 to 3.0 percent of imported carbon black, 5.2 to 7.9 percent of crystalline flake graphite, 3.9 to 6.0 percent of coke, 5.0 to 8.0 percent of sodium fluoride, 3.0 to 5.0 percent of barium carbonate, 12.9 to 15.5 percent of glass powder, 1.8 to 3.8 percent of sodium metaaluminate and 2.5 to 5 percent of binder, and the sum of the contents of the raw materials is 100 percent. The method is used for improving the surface and subcutaneous quality of the casting blank and ensuring the safe and smooth operation of the continuous casting process.

The invention discloses a ceramic-based low-temperature co-fired ceramic material and a preparation method thereof, and belongs to the field of low-temperature co-fired ceramics. The ceramic-based low-temperature co-fired ceramic material is prepared from the following raw materials: ceramic-based composite powder and a processing aid, the ceramic-based composite powder is prepared from the following components in percentage by mass: 90 to 98 percent of CaAl2B2O7 powder and 2 to 10 percent of lithium borosilicate barium glass powder. The low-intrinsic-loss CaAl2B2O7 powder crystal phase serves as a base material, has a low dielectric constant and can promote rearrangement and densification of particles in the sintering process in cooperation with the lithium borosilicate barium glass powder, the formed liquid glass phase wraps crystal grains, it is ensured that the crystal grains of the CaAl2B2O7 powder form a continuous skeleton structure, and dielectric loss is reduced. And barium ions in the lithium borosilicate barium glass powder can inhibit migration of lithium ions, reduce dielectric loss and improve overall heat-resistant stability, so that the low-temperature co-fired ceramic material with low dielectric constant and low dielectric loss is obtained.

The purpose of the present invention is to provide a lithium ion secondary battery negative electrode active material capable of suppressing deterioration of a discharge capacity retention rate (cycle characteristics) even if charge and discharge are repeated by suppressing collapse of silicon particles due to expansion and contraction of the silicon particles accompanying storage and release of lithium. In this lithium ion secondary battery negative electrode active material in which silicon particles are dispersed in a lithium silicate phase, the lithium silicate phase is a composite having a barium-containing glass material as a main phase.