37results about How to "Uniform and dense grain" patented technology

The invention provides a high-frequency low-loss MnZn ferrite material, which comprises main components and auxiliary components, wherein the main components are 53-56 mol percent of ferric oxide, 34-41 mol percent of manganese oxide and 6-10 mol percent of zinc oxide, the content of manganese oxide is measured by Mn; the auxiliary components are at least three selected from CaCO3, SiO2, Nb2O5, CoO, V2O5, SnO2 and TiO2, and based on the total weight of the main components, the auxiliary components comprise: 0.02-0.08 weight percent of CaCO3, 0.002-0.01 weight percent of SiO2, 0.02-0.06 weightpercent of Nb2O5, 0.03-0.20 weight percent of CoO, 0.01-0.05 weight percent of V2O5, 0-0.20 weight percent of SnO2 and 0-0.10 weight percent of TiO2. The invention also provides a manufacturing method of the high-frequency low-loss MnZn ferrite material.

A samarium-containing rare earth polishing powder, the composition of which is calculated by molar ratio: Sm 2 o 3 / TREO=1.4×10 ‑4 ~0.014, La 2 o 3 / TREO=0.06~0.12, Pr 7 o 11 / TREO=8.6×10 ‑6 ~0.0047, Nd 2 o 3 / TREO=2.97×10 ‑5 ~0.0074, the balance is CeO 2 / TREO=0.27~0.46. The rare earth polishing powder uses samarium-containing rare earth salt solution as the main raw material, adds fluorine-containing precipitant solution to the raw material, controls the fluorine content in the product by adjusting the fluoride ion concentration in the precipitant, and then washes, dries and calcines , crushing and grading processes. The main difference between this process and other production processes is that samarium element is introduced into the rare earth raw material, and fluorine element is introduced into the precipitant, which has the advantages of simple preparation process and wide source of raw materials. The prepared rare earth polishing powder has uniform crystal grains, obvious edges and corners, and fast cutting speed.

The invention discloses a boron-doped diamond electrode with high conductivity, long service life and high specific surface area. The boron-doped diamond electrode uses an etched substrate as an electrode base; or on the surface of an etched substrate After the transition layer is set as the electrode base, a boron-doped diamond layer is set on the surface of the electrode base. The boron-doped diamond layer includes a boron-doped diamond bottom layer with different boron content, a boron-doped diamond middle layer, and a boron-doped diamond layer. Top layer; wherein, the boron-doped diamond bottom layer in contact with the substrate is used as a conductive layer, the boron-doped diamond middle layer is used as a corrosion-resistant layer, the boron-doped diamond top layer is used as a strong electrocatalytic active layer, and the substrate is a metal phase and A composite material composed of ceramic phases, the metal phase is continuously distributed in the composite material; the boron-doped diamond electrode obtained in the present invention has high electrical conductivity, low residual stress, long life, and high specific surface area, and when it is applied to degrade wastewater, the degradation efficiency is greatly improved promote.

The invention relates to a metal oxide electrode used for the treatment of organic wastewater and a production method thereof. The technical proposal the following steps of: sequentially boiling and etching the industrially pure titanium sheet that is ground and washed in an alkali solution, acid solution and saturated oxalic acid solution respectively, then taking out and washing with a distilledwater to obtain a pre-treated metallic matrix of titanium; placing cathode titanium plates at two dies of the metallic matrix of titanium symmetrically and placing the both into a mixture of MnSO4 and H2SO4, then calcining after deposited by the anode electro-deposition process to obtain Ti / MnO2 electrode; the titanium plate cathode and the Ti / MnO2 electrode are placed in the mixture of Pb(No3)2,Cu(NO3)2, NaF and HNO3, then power is supplied by two stage during the anode electro-deposition process to obtain the Ti / MnO2 / PbO2 composite electrode. The production method provided by the inventionis simple and the manufacturing cost is low; the metal oxide electrode produced by the invention can be used for the treatment of organic wastewater and is characterized by high activity, good conductivity, strong anodic oxidation resistance and long service life.

The invention discloses a special-shaped cable and a preparation method thereof. The guide core of the special-shaped cable is formed by connecting at least two guide core sections with different cross-sectional shapes end to end. The outside of the core segment is covered with an insulating layer, and the contour of the insulating layer fits the core segment. The cable has good bending performance, can better fit the vehicle body, saves consumables, and greatly improves its safety performance. The cable uses an aluminum or aluminum alloy guide core, which can reduce the weight of the vehicle body and reduce the production cost of the motor vehicle. The preparation method of the special-shaped cable includes the steps of making core segments, connecting core segments and making insulating layers, which can effectively improve production efficiency and production volume and reduce production costs according to different production requirements.