33 results about "Ceramic chemistry" patented technology

The invention relates to a large-opening wine jar packaging anti-theft device. A ceramic wine jar is sealed through a ceramic jar cover, the ceramic jar cover is jacked through a closely-packaging screw or a closely-compression cover, so that the ceramic jar cover and an opening of the ceramic wine jar at kept in the good sealing effect. A sealing screw is used for extrusion sealing, as the chemical property of ceramics is stable, cannot age, cannot separate out hazardous substance when being in contact with wine, and is suitable for long-term storage; and the longer the storage time is, the better the quality of the wine is.

The invention discloses a polycrystalline YAG ceramic chemical mechanical polishing fluid, which belongs to the technical field of precision / ultraprecision processing. The polycrystalline YAG ceramic chemical mechanical polishing fluid has a pH of 7 and contains two parts: a solute and a solvent: the solvent is deionized water. Based on 100% of the total mass fraction of the polishing liquid, its components and mass percentages are as follows: 10-30 wt% silica sol, 1-5 wt% alumina abrasive grains, 0.1-0.5 wt% abrasive grain dispersant, appropriate pH Regulator, each substance is mixed uniformly by ultrasonic in deionized water. The ultra-smooth polishing of polycrystalline YAG ceramics can be realized by using the polishing liquid. The grain boundary height difference of the polished polycrystalline YAG crystal surface is significantly reduced, and an ultra-smooth and non-damaged polycrystalline YAG crystal surface can be obtained; In addition, the polishing liquid of the present invention has high material removal efficiency, which is significantly improved compared with the polishing liquid containing only silica sol or alumina.

A microwave dielectric ceramic with near-zero frequency temperature coefficient and a preparation method thereof belong to the technical field of microwave dielectric materials and its manufacture. Ceramic chemical formula: Ca 1-x Zn x La 4 Ti 5 o 17 , x=0.005~0.4. CaCO 3 , ZnO, La 2 o 3 、TiO 2 As raw materials, wet grinding and mixing, drying to make powder, calcining at 1100-1200°C, wet grinding, drying, adding polyvinyl alcohol (PVA), pressing and molding, and sintering in a high-temperature furnace for 2-4 hours. Microwave dielectric ceramics. The dielectric constant of the microwave dielectric ceramic of the present invention is between 56 and 58, the Q×f value is between 8200 and 18500 GHz, and the temperature coefficient of resonance frequency is less than 15%; it can be widely used in microwave devices such as various dielectric resonators and filters Manufacture to meet the technical requirements of mobile communication, satellite communication and other systems, and increase the types of medium dielectric constant microwave dielectric ceramic materials.

The invention provides a tin-doped lead lanthanum zirconate titanate thick film ceramic and its preparation and application, belonging to the technical field of energy storage ceramic materials. The tin-doped lead lanthanum zirconate titanate thick-film ceramic has a chemical composition conforming to the general chemical formula Pb 0.94 La 0.06 (Zr 0.95～x Sn x Ti 0.05 ) 0.985 O 3 , where 0.05≦x≦0.15. The preparation method includes the following steps: (1) weighing each raw material in proportion, mixing, ball milling, drying, sieving and calcining to obtain a sintered product; (2) subjecting the sintered product to high-energy ball milling, drying and sieving to obtain fine particles Powder; (3) Mixing the fine powder with dispersant and solvent, tumbling, adding binder and tumbling, then adding dispersant, binder, solvent and plasticizer, and tumbling to obtain casting slurry ; (4) Casting the casting slurry to obtain a thick film green body, sintering, that is, obtained. The tin-doped lead lanthanum titanate ceramic thick film can withstand an electric field strength of 400 kv / cm, significantly improves the energy storage density and energy storage efficiency of the ceramic thick film, and has wide application prospects.

The present invention disclosed a modified nickel nickel -leading leader -titanic acid lead and voltage ceramics. The chemical group is divided into: PB 1‑x Me x Ni 1 / 3 NB 2 / 3 Cure 0.326 (ZR y TI 1‑y Cure 0.674 O 3 +3 % PBO+3 % NIO+ZWT % A; ME in the formula is any or two types in 锶 and 钕, A is any type of metal oxide of 锑 and 钇.The invention piezoelectric ceramics can form a solid -soluble solid solid -soluble through the mix of 锶 and 钕, 锑 or 钇, and obtain a 0.326pnn‑0.647pzt piezoelectric ceramics with good comprehensive performance.Highly rested temperature and electromechanical coupling coefficients; at the same time, the preparation method is simple, the raw materials are easy to obtain, and the practicality of industrial is.

The invention discloses a degradable low-temperature co-fired ceramic, which is a ceramic material mainly composed of borosilicate inorganic polymer molecular structure, and its composition chemical formula is xB 2 o 3 ·ySiO 2 · zAl 2 o 3 ·wMO, where MO is MgO, CaO, SrO, BaO, Na 2 O, Al 2 o 3 、K 2 At least one of O, ZnO or rare earth element oxides, x, y, z, w are mass percentages, 20wt%≤x≤65%, 15%≤y≤65%, 0%≤z≤30%, 0 %≤w≤30%. The preparation method of the ceramic is based on SiO 2 , SiO 2 ·nH 2 O, H 3 BO 3 , B 2 o 3 , NaOH, KOH, Ba(OH) 2 ·8H 2 O, Al(OH) 3 , MgO, CaO, SrO, ZnO and rare earth oxides as raw materials, through ball milling, drying, grinding, calcination, granulation, molding and sintering process steps. The degradable ceramic can not only be co-fired with electrode materials such as silver, copper and gold, but also can be co-fired with low-melting-point metal electrodes such as aluminum. Based on its unique borosilicate-rich inorganic polymeric structure as the hydrolysis trigger phase, through the control of the chemical composition of the ceramic and the design of the dispersion distribution of the hydrolysis trigger phase in the structure, the ceramic can degrade itself in humid conditions, water and salt solutions.

The invention discloses a composite phosphate-based microwave dielectric ceramic, the chemical formula of which is Ca 4 (La 4 ‑xBi x PR 2 ) (SiO 4 ) 4 (PO 4 ) 2 o 2 (0.2≤x≤0.8)+ywt%Li 2 CO 3 (0.5≤y≤1.0)+zwt%C(0 <z≤1)。本发明还公开一种复合磷酸盐系微波介质陶瓷的制备方法，具体制备步骤如下：(1)将化学原料将化学原料将caco3. La 2 o 3 , SiO 2 、 Bi 2 o 3 、Pr 2 o 3 and NH 4 h 2 PO 4 stoichiometric Ca 4 (La 4 ‑xBi x PR 2 ) (SiO 4 ) 4 (PO 4 ) 2 o 2 (0.2≤x≤0.8) The stoichiometric composition weighs the ingredients into pre-ground ingredients; (2) puts the pre-ground ingredients into a ball mill tank for ball milling, and after ball milling, puts them in a drying oven to dry them into powder; (3) puts the powder (4) weigh the calcined powder and put it into a ball mill jar, add 0.5-1.0wt% Li 2 CO 3 , 0~1.0wt% C, zirconia balls and deionized water, ball milling and drying to obtain drying powder; add binder to the drying powder to granulate, and press into embryo body; (5) embryo body Carry out middle temperature sintering into microwave dielectric ceramics; (6) test the microwave dielectric properties of microwave dielectric ceramics.

The present invention relates to a kind of high-entropy ceramics with high hardness and high conductivity and its preparation method and application. The chemical formula of the high-entropy ceramics is (A a B b C c D. d E. e )B 12 . The dodecaboride high-entropy ceramic provided by the present invention has high hardness and high electrical conductivity at the same time, enriches the boride high-entropy ceramic material system, has the advantages of low cost, simple operation, wide application range, etc., and can withstand high stress and high Electrical conductivity has great application potential in the field of electrical equipment.

The present invention relates to flashing luminescent material technology, and is especially flashing luminescent material with relatively high light output under the excitation of X-ray or other high energy ray and slow attenuation and its preparation process. The flashing luminescent material is trivalent RE ion activated RE tungstate in the chemical composition of RE2(1-x)Eu2xWO6, where, RE is at least one of Y, La, Gd and Lu, x is the content of activator Eu3+, and 0.05 C09K 11 / 78 2 5 2 2006 / 6 / 9 1858150 2006 / 11 / 8 100412157 2008 / 8 / 20 2008 / 8 / 20 2008 / 8 / 20 Shanghai Inst. of Ceramic Chemistry and Technology, CAS Shanghai 200050 Zhang Zhijun Zhao Jingtai Duan Chengjun Yuan Junlin Wang Xiaojun Chen Haohong Yang Xinxin pan zhen 31002 Shanghai Patent Agency of the Chinese Academy of Sciences No.319 Yueyang Road, Shanghai 200031

The present invention relates to a high pressure-resistant energy-storing medium ceramic and its preparation method. The chemical composition of said ceramic is Sr(Ti0.95 Zr0.05) O3+Xmol% CaTiSiO5, in which X is greater than O and less than or equal to 20. Its preparation method includes the following steps: adopting solid-phase method, using SrCO3 and TiO2 to synthesize SrTiO3; using SrCO3 and ZrO2 to synthesize SrZrO3; using CaCO3 SiO2 and TiO2 to synthesize CaTiSiO5 powder body; mixing materials according to the above-mentioned chemical composition formula; ball-grinding according to the ratio of material; ball: water=1:1:1-1.2, drying; adding polyvinyl alcohol solution as binding agent, granulating, sieving with 40 meshes, press-forming, slowly heating to 600-650deg.C to remove binding agent, sintering at 1260-1420deg.C, heat-insulating for 2-6hr, so as to obtain the invented product.