60results about How to "High insulation resistivity" patented technology

A nanometer ceramic material dopant, medium material of ceramic capacitor and their production are disclosed. The formula of the dopant consists of aA.bB.cC.dR2 O3.eSiO2; A contains Na2O; B contains one or multiple of MgO and CaO; C contains one or multiple of MnO2 and Co3O4; R contains one of multiple of Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, among them a, b, c, d and e are coefficient, by computing mol%, 0<=a<=10%, 0<=b<=25%, 0<=c<=15%, 20%<=d<=60%, 10%<=e<=50% and b and c can't be zero at same time. Its advantages include large capacity, adjustable material formula, low sintering temperature, less medium loss, high dielectric constant and better reliability.

The invention relates to a high dielectric constant X8R type MLCC medium material and a preparation method, the high dielectric constant X8R type MLCC medium material takes 100 weight parts of barium titanate as a base material, and the medium material comprises the following components by weight: 1.6-2.5 parts of niobium cobalt compound, 0.722-1.805 parts of titanium bismuth sodium compound, 1.25-2.0 parts of zirconium calcium compound, 1-3 parts of glass powder, 0.369-1.2 parts of one or a plurality of oxides of Ce, Yb, Dy and Ho and 0.1-0.25 part of manganese carbonate. The key and core of the present invention are characterized in that a proper amount of manganese carbonate, rare earth elements and a zirconium calcium compound are added, the rare earth element can be taken as a donor or an acceptor in the barium titanate dielectric ceramic material for doping and modifying, the movement of the intrinsic oxygen vacancy and the oxygen vacancy brought by other B site donor doping can be inhibited, the insulation resistivity of a material system, the ageing resistance and the reduction resistance of a material system can be increased, and the method provided by the invention can be used for making silver-palladium electrodes and nickel electrodes MLCC.

The invention discloses resin paint special for epoxy phenol-formaldehyde silicon steel sheet and the preparation method thereof. The resin paint comprises, by weight, polymer 609 epoxy resin 98 to 102 parts, 214 phenol-formaldehyde resin 18 parts, Z-11 epoxy toughener 5 parts, L-12 leveling agent 7.8 parts, and diluting agent 2 to 5 parts. The diluting agent is toluene or ethanol or ethyl acetate. The resin paint has the advantage of excellent performance in resisting heat, moisture, oil, and chemical corrosion, and can be applied at normal temperature and dried rapidly. The resin has good uniformity and arbitrarily adjustable viscosity, and can be uniformly mixed with inorganic filler to achieve good manufacturability. The resin paint has good adhesion with the surface coating of silicon steel sheet, and the coating has good mechanical strength, high heat resistant grade and high insulation resistance coefficient, and can be used for F-grade (155 DEG C) electric products to achieve long storage life.

The invention belongs to the technical field of ceramic materials, and discloses a giant dielectric constant strontium titanate dielectric ceramic and a preparation method thereof. The chemical formula of the ceramic is Sr1-xEuxTiO3, wherein x is more than or equal to 0.01 and less than or equal to 0.015. The preparation method comprises the following steps: proportioning SrCO3, Eu2O3 and TiO2, mixing, and carrying out ball milling; drying the ball-milled raw materials, sieving, pre-sintering at 1000 DEG C for 3 hours, and mixing and ball-milling the pre-sintered powder; drying and sieving the ball-milled raw materials, adding a binder into the obtained powder, sieving, granulating, pressing into a green body, and discharging glue; and sintering the blank body after complete glue removal at 1400 DEG C in N2 atmosphere, and preserving heat for 6 hours to obtain the final sample. According to the invention, the Sr1-xEuxTiO3 dielectric ceramic is prepared through doping modification by adopting a traditional solid-phase method, the dielectric constant is improved, the lower dielectric loss is kept, and the dielectric property of the ceramic material is further improved, so that the actual application requirements are better met.

The object of the present invention is to provide a dielectric ceramic composition having even improved insulation specific resistance and highly accelerated lifetime. A dielectric ceramic composition comprising a dielectric particle having a core-shell structure including a main component expressed by a general formula ABO₃ (A is Ba and the like; and B is Ti and the like) and a rare earth element component R, in which

• • a shell part of the core-shell structure has an average rare earth element concentration C of 0.3 atom % or more, and
  • a rare earth element concentration gradient S is −0.010 atom %/nm≤S≤0.009 atom %/nm or a rare earth element concentration variation satisfies σ/C≤0.15 (a is a standard deviation of a rare earth element concentration and C is an average rare earth element concentration).

The invention relates to an anti-reduction BaTiO3-based dielectric ceramic and a preparation method thereof. The chemical formula of the dielectric ceramic is (1-x) BaTiO3-xBi (Zn1/2Y1/2) O2.75, wherein x= 0.05-0.25. The preparation method comprises the following steps: (1) taking BaTiO3, Bi2O3, ZnO and Y2O3 as raw materials, and proportioning the raw materials according to the stoichiometric ratio of metal atoms in the chemical formula; (2) uniformly ball-milling and mixing the raw materials, drying, and presintering the raw materials in a muffle furnace to obtain ceramic powder; (3) carryingout secondary ball milling on the ceramic powder obtained by presintering, drying, then granulating and pressing to obtain a ceramic green body; and (4) after adhesive discharge of the ceramic greenbody, introducing reducing gas into a tube furnace for sintering to obtain the anti-reduction BaTiO3-based dielectric ceramic. The dielectric ceramic is sintered in a reducing atmosphere and has the characteristics of excellent insulating property and dielectric property, low production cost, stable dielectric property in a wide temperature range and the like, particularly when x = 0.15, the dielectric ceramic has the insulation resistivity which reaches up to 5.5* 1012 omega.cm, and the dielectric temperature stability meets the X8R standard.

The invention provides silicon resin powder which is prepared from the following components in parts by weight: 15-35 parts of methyl vinyl polysiloxane, 10-15 parts of diphenyl trichlorosilane, 5-10 parts of acrylic polymer powder, 5-10 parts of calcium oxide, 10-20 parts of silicon carbide, 5-15 parts of water-based amino resin, 5-10 parts of novolac epoxy resin, 10-20 parts of nitrile-butadiene rubber and 2-5 parts of molybdenum disulfide. The silicon resin powder provided by the invention has favorable adhesive force, solvent resistance, heat-resistance temperature and storage stability.

A dielectric ceramic which is suitable for use in a laminated ceramic capacitor under a high-temperature environment, such as encountered in, for example, automobile use has a composition represented by the composition formula: (1−x) (Ba_1-yCa_y)_mTiO₃+xCaTiO₃+aRe₂O₃+bMgO+cMnO+dV₂O₃+eSiO₂ in which Re is Gd, Dy, Y, Ho, and/or Er), 0.001≦x≦0.02, 0.08≦y≦0.20, 0.99≦m≦1.05, 0.01≦a≦0.04, 0.005≦b≦0.035, 0≦c≦0.01, 0≦d≦0.01, 0.01≦e≦0.04 when a, b, c, d, and e are each expressed in terms of parts by mol with respect to 1 mol of (1−x) (Ba,Ca)TiO₃+xCaTiO₃. This dielectric ceramic can constitute the dielectric ceramic layers of a laminated ceramic capacitor.