33results about How to "Improve sintering stability" patented technology

The present invention provides for lithium ion secondary batteries that use Ni-based lithium transition metal oxide cathode active materials. The cathode active materials are substantially free of Li2CO3 impurity and soluble bases.

The present invention provides for a process of making a Ni-based lithium transition metal oxide cathode active materials used in lithium ion secondary batteries. The cathode active materials are substantially free of Li2CO3 impurity and soluble bases.

The present invention provides for Ni-based lithium transition metal oxide cathode active materials used in lithium ion secondary batteries. The cathode active materials are substantially free of Li2CO3 impurity and soluble bases.

The invention provides a nano-microwave dielectric ceramic material prepared from a mixture comprising a composite oxide and a sintering aid; the composite oxide has a general formula shown in formula (I): xLn 2 o 3 ‑yBaO‑zAl 2 o 3 ‑wTiO 2 ; In formula (I), 0<x≤10, 0≤y≤10, 0≤z≤1, 0<w≤20. Compared with the prior art, the nano-microwave dielectric ceramic material provided by the present invention takes the composite oxide of the above-mentioned specific general formula as the main component, and its crystal structure changes from the perovskite structure as the ratio of x, y, z, and w changes. Transforming to the composite perovskite structure and then to the black bronze structure, the BaO‑Ln 2 o 3 -TiO 2 (Ln: La\Sm\Nd) system microwave dielectric ceramic material is effectively improved; the nano-microwave dielectric ceramic material also has a high dielectric constant, extremely low dielectric loss and good sintering stability, and at the same time resonant The frequency temperature coefficient is adjustable, and it has very broad application prospects in the field of microwave communication.

A low dielectric constant microwave dielectric ceramic material, characterized in that it includes the following components by mass: main material, the content of the main material is 75-85wt%, and the main material is R-doped Zn 2 SiO 4 , wherein R includes one or more of Nb, Sm, La, and Nd, and the content of R is 0.01-0.1 times the molar content of Si; the auxiliary material is TiO 2 , the content of the auxiliary materials is 10-17wt%; the sintering aids, the sintering aids include SiO 2 , Na 2 O and B 2 O 3 One or more of the above, the content of the sintering aid is 1-10wt%. The low dielectric constant microwave dielectric ceramic material has a dielectric constant of 8‑11, a quality factor greater than 40000, and a resonant frequency temperature coefficient τf of ‑35 to 0ppm / ℃, which can be widely used in dielectric resonant antennas, filters, duplexers, etc. in ceramic components.

The invention discloses an anti-battery effect isolation medium slurry for a thick film circuit. The medium slurry comprises the following components in mass percentages: 60%-75% of glass powder, 3%-12% of additives, and 1% of inorganic pigments ~5%, organic vehicle 20%~35%, among which the glass powder is composed of ZnO, CaO, Al 2 o 3 , SiO 2 , B 2 o 3 , TeO 2 Composition, the additives are composed of micron-sized anorthite, α-type nano-alumina, nano-ZrO 2 Composition, the micron grade anorthite ore is made by crushing anorthite ore, sieving through an 80-mesh sieve, and then roasting at 750-800°C for 1-3 hours, and then ball milling to a particle size of 1-2 μm after natural cooling. to make. The anti-battery effect isolation medium paste for thick film circuits of the present invention has the characteristics of excellent anti-battery effect, good printability, dense firing film layer, high breakdown voltage resistance, high insulation resistance and small dielectric constant.

The invention discloses a carbon block fixing method used for a continuous prebaked anode. The carbon block fixing method is characterized in that a new anode carbon block (4) is arranged on an anode carbon block (4) which is in electrolysis, and the part between the upper anode carbon block (4) and the lower anode carbon block (4) is coated with a bonding layer (5); and through heat conduction of the lower anode carbon block (4) in the electrolytic process, the anode carbon blocks (4) are sintered together. By means of the carbon block fixing method used for the continuous prebaked anode, the new anode carbon block is arranged on the anode carbon block which is in electrolysis, coating of the bonding layer is conducted, and the upper anode carbon block and the lower anode carbon block are sintered together through electrolysis heat transfer.

The present application relates to a red colorant for zirconia ceramics, a preparation method and application thereof. The red pigment for zirconia ceramics of the present application has the formula of xABO 3 +yR 2 O 3 +zC, this pigment does not contain toxic heavy metals and has bright color. The present application provides a method for producing a red colorant for zirconia ceramics, including the steps of pretreatment, batching, ball milling and mixing, drying, powder pretreatment, heterogeneous coating, and powder posttreatment. One of the cores of the method is to use Heterogeneous encapsulation technology to improve the stability of red pigments under high temperature sintering conditions. The present application provides a red yttrium-stabilized zirconia granulated powder, which is prepared by mixing the aforementioned red pigment and yttrium-stabilized zirconia. The present application also provides red zirconia ceramics obtained by sintering the aforementioned granulated powder and ceramic products obtained by processing.

The invention discloses a resistance paste for a high-performance thick-film resistor. The resistance paste comprises the following components in mass percentage: 20%-45% of conductive powder, 25%-40% of calcium borosilicate glass powder, nanometer yttrium Aluminum garnet powder 1%~3%, inorganic additive 0.5%~10%, organic carrier 25%~35%, among them, the conductive powder is a composite material produced by ruthenium dioxide and porous silicon carbide, and the specific surface area is 75~95m 2 After mixing and granulating ruthenium dioxide per g and porous silicon carbide with a particle size of 1-2 μm, it is isostatically pressed at 100-150 MPa for 4-6 hours, vacuum heat-treated at 400-500 °C for 1-2 hours, crushed and ball-milled to 1~2μm powder. The resistance slurry of the present invention has the characteristics of lead-free environmental protection, high resistance precision, strong power resistance, good electrostatic discharge, and good stability when placed at a constant temperature.

The invention discloses a high-temperature-resistant grinding-resistant diamond grinding block. The high-temperature-resistant grinding-resistant diamond grinding block is prepared from, by weight, 90-100 parts of diamond, 40-50 parts of aluminum isopropoxide, 2-3 parts of tin powder, 1-2 parts of polyvinylpyrrolidone, 20-30 parts of ferric chloride hexahydrate, 17-21 parts of ferric chloride tetrachloride, 10-15 parts of toluene diisocynate, 14-20 parts of polyadipic acid-1,4-butanediol ester diol, 3-4 parts of acetone and 0.4-1 part of 2,6-butylated hydroxytoluene. According to the high-temperature-resistant grinding-resistant diamond grinding block, the colloidal sol-coated ferric oxides, diamond and tin powder are added, and therefore the sintering stability of a finished product can be effectively improved; and the added prepolymers have the very good bonding effect, therefore, the coating stability can be improved, and the high temperature resistance and the grinding resistance of a finished product module can be enhanced.

The invention discloses a graphene modified hard alloy and a preparation method thereof. The preparation method includes: uniformly mixing graphite, dispersant, hard alloy and solvent, and performing high-energy ball milling treatment to exfoliate the graphite into graphene to obtain a cemented carbide composite powder comprising graphene and hard alloy, and then carry out Drying, granulation, press molding, degumming, sintering and other treatments to obtain graphene modified hard alloy. The invention utilizes the cemented carbide powder ball milling process, which can realize the exfoliation and dispersion of graphene and the ball milling refinement of cemented carbide powder at the same time, avoid the cumbersome process of exfoliating graphene alone, and precisely combine the powder metallurgy process without changing the existing process conditions. At the same time, the graphene exfoliated in situ by mechanical ball milling has the advantages of complete structure and low defect level, which can significantly improve its sintering stability, and has a significant effect on the performance of cemented carbide and grain refinement. effect and has important industrial application prospects.