220 results about "Magnesium titanate" patented technology

Lepidocrocite potassium magnesium titanate having a composition represented by the formula K0.2-0.7Mg0.4Ti1.6O3.7-4 and obtainable by subjecting an aqueous slurry of lepidocrocite potassium magnesium titanate having a composition represented by the formula K0.8Mg0.4Ti1.6O4 to an acid treatment and subsequent calcination. <IMAGE>

Disclosed are ceramic bodies comprised of composite cordierite aluminum magnesium titanate ceramic compositions and methods for the manufacture of the same.

The present invention provides a process for preparing a sintered body comprising as a basic component aluminum magnesium titanate represented by the composition formula: MgxAl2(1−x)Ti(1+x)O5 wherein the value of x is 0.1≦x<1. The process comprises a step of sintering a formed product from a raw material mixture comprising 100 parts by weight, calculated on an oxide basis, of a mixture comprising a Mg-containing compound, an Al-containing compound and a Ti-containing compound at the same metal component ratio as the metal component ratio of Mg, Al and Ti in the above composition formula, and 1–10 parts by weight of an alkali feldspar represented by the composition formula: (NayK1−y)AlSi3O8 wherein the value of y is 0≦y≦1.According to the process of the present invention, a sintered body of aluminum magnesium titanate having stability in continuous use at high temperatures and excellent mechanical strength, while maintaining inherently low thermal expansibility of a sintered body of aluminum magnesium titanate, can be obtained.

Disclosed are ceramic bodies comprised of composite cordierite aluminum magnesium titanate ceramic compositions and methods for the manufacture of same.

The invention discloses a magnesium titanate bismuth-lead titanate piezoelectric ceramics suitable for a high-temperature field, belonging to perovskite structure piezoelectric ceramics. The invention can be represented by the general formula: (1-x)Bi(Mg1 / 2Ti1 / 2)O3-xPbTiO3+alphaMnO2(mol%), wherein x=0.32-0.42, x represents the molar percent of PbTiO3, alpha=0-2 mol%, and the alpha is the molar percent for MnO2 to account for the raw material total amount; MnO2 is a doped metallic oxide and can lower the loss factor of the piezoelectric ceramics. The piezoelectric ceramics is prepared by the traditional piezoelectric ceramics preparation technology, lead tolerance is lower than 42 mol%; d33 can be kept at 170 pC / N at the temperature of 350 DEG C; and after MnO2 is doped, Curie temperature Tc can be 520 DEG C, d33 is 120 pC / N, and the loss factor tan delta is lowered to 0.018. The invention has huge high-temperature application potential and practical application value.

There is provided an insulation material having a dielectric constant of 10 or more, comprising a filler having a dielectric constant of 50 or more and having two peaks in different particle size ranges in a particle size distribution and an insulating resin combined with each other; an insulation material having a dielectric constant of 10 or more comprising, as essential components, 1) at least one filler selected from the group consisting of barium titanate, strontium titanate, potassium titanate, magnesium titanate, lead titanate, titanium dioxide, barium zirconate, calcium zirconate and lead zirconate, 2) an insulating resin and 3) a dispersant containing a carboxylic group; or an insulation material comprising a filler having a dielectric constant of 50 or more, a dispersant for dispersing the filler and an insulating resin as essential components, wherein an extract of a cured product of the insulation material obtained by extraction with water at 120° C. for 20 hours using a pressure vessel has a pH of 6 or higher.

The invention relates to a hollow structure potassium magnesium titanate whisker material and a method for preparing the same. The technical scheme is that the method comprises evenly mixing a titanium-containing raw material, a magnesium-containing raw material and a binding agent, performing forming, performing heat treatment and then grinding the mixture to obtain a material A with the particle size of 0.088-1 mm and a material B with the particle size smaller than 0.088 mm; evenly mixing a potassium-containing raw material, a titanium-containing raw material and a binding agent, performing forming, performing heat treatment and then grinding the mixture to obtain a material C with the particle size smaller than 0.088 mm; evenly mixing the material A, the material B, the material C and a potassium-containing raw material, performing heat treatment and then grinding the mixture to obtain a ground material; finally adding the material C, the potassium-containing raw material and water to the ground material, mixing the mixture, pressing the mixture into green bodies, drying the green bodies, performing heat treatment, and then performing washing, filtration and drying to obtain the hollow structure potassium magnesium titanate whisker material. The external diameters of whiskers of the prepared hollow structure potassium magnesium titanate whisker material are 0.1-5 microns, the internal diameters of the whiskers are 0.05-1 micron, and the lengths of the whiskers are 3-30 microns. The hollow structure potassium magnesium titanate whisker material is high in crystallinity and uniform in size.

A magnesium titanate oxide film implant, and a method for preparing the same. The magnesium titanate oxide film implant is prepared by forming a titanium oxide film (a magnesium titanate oxide film) in which magnesium is incorporated into the surface of titanium or a titanium alloy. A magnesium titanate oxide film implant is prepared by irradiating UV light on an implant body made of titanium or a titanium alloy in distilled water, dipping the UV light-irradiated implant body in an electrolyte solution containing magnesium, and coating a magnesium titanate oxide film on the dipped implant body by anodic oxidation. Therefore, the present invention can provide an implant having increased bioactivity of a titanium oxide film formed by anodic oxidation, and provides an optimum magnesium titanate oxide (TixMgyOz) thickness for successful osseointegration of the magnesium titanate (TixMgyOz) implant.

The invention discloses an ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material and a preparation method thereof. A chemical component of the ceramic material is Li2Mg3TiO6; the dielectric loss is 0.000037-0.000048; Q*f is 123,000-152,000GHz; the dielectric constant is 14.5-15.5; the temperature coefficient of the resonance frequency is -42ppm / DEG C to -36ppm / DEG C; and the ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material is prepared by a high-temperature solid reaction method. The microwave dielectric ceramic material is simple in preparation method, abundant in used raw material, low in cost, and beneficial to industrialized production; and the prepared microwave dielectric ceramic is stable in performance, can be used as a manufacturing material for an electronic circuit substrate, a dielectric resonator, a filter, a high-frequency satellite microwave device substrate and a microstrip line, and has important application prospect and economic value in the fields of electronic circuits, microwave mobile communication, satellite communication and radar systems.

Disclosed are ceramic bodies comprised of composite cordierite aluminum magnesium titanate ceramic compositions and methods for the manufacture of same.