32results about How to "Isolation erosion" patented technology

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a porous silicon negative electrode material for lithium ion batteries and a preparation method thereof. The porous silicon negative electrode material includes nanoporous silicon, conductive carbon and amorphous carbon, and the nanoporous silicon contains Contains oxygen, the oxygen content is 10-40wt.%, the proportion of nanoporous silicon in the negative electrode material is 30%-80wt.%; the proportion of conductive carbon is 5%-30wt.%; the proportion of amorphous carbon %, the median particle size D50 of the nanoporous silicon is below 110nm, and the maximum particle size D100 is below 260nm. The nanoporous silicon is prepared by a wet grinding process, and the raw material is porous silicon powder. The porous silicon powder disclosed by the present invention Silicon anode materials have excellent electrochemical properties, high specific capacity, excellent cycle performance, and high initial efficiency.

The invention relates to a boric oxide fiber damp-proof coating material and the production method thereof, and belongs to the technical field of special ceramic. The invention comprises the steps as follows: liquid paraffin and paradichlorobenzene are mixed in the ratio of 100ml: (5 to 30) g. The liquid paraffin is mixed with the paradichlorobenzene to be heated and mixed by a magnetism mixing device with the heating temperature of 40 to 80 DEG C till the paradichlorobenzene unfreezes completely and the solution is cooled to the room temperature, then the damp-proof coating material for the boric oxide fiber is obtained. The coating material of the invention has the functions of drawing lubrication, and preventing the boric oxide fiber from pulverization. The material is coated at the surface of the front boric oxide fiber and can form a layer of thick protective films at the boric oxide fiber surface, and separates the corrosion of water to the boric oxide fiber, improves the intensity of the boric oxide fiber obviously, thereby improving the integrative performance of the boric oxide fiber and having good basis for research of the fiber reinforcing ceramics composite material. The invention which has simple and reasonable production method is convenient and practical.

In order to fill in the gaps in the prior art, the present invention discloses a method for in-situ construction of a superhydrophobic coating on the surface of a copper alloy for the first time: introduce divalent and trivalent elements (such as Zn, Al) into the copper alloy, and the copper alloy Immersed in sodium chloride solution, the layered double metal hydroxide / oxide multi-level structure film can be obtained in situ; determine the microscopic morphology and phase type of the synthesized multi-level structure, and adjust the temperature for preparing the coating. A multi-level structure with different densities was built; the static contact angle of the surface modified by perfluorooctyl triethoxysilane was determined; and the corrosion resistance of copper alloys with superhydrophobic coatings was characterized by electrochemical tests, thereby Demonstration of corrosion resistance of superhydrophobic coatings. The present invention is the first proposed method for constructing a superhydrophobic coating on the surface of copper alloy in situ, which is simple, convenient, energy-saving, environmentally friendly, low in cost, strong in controllability, strong in binding force with copper alloy substrate, stable in structure and relatively practical. Strong, can be widely used in industrial production.

The invention relates to an alkali resistant ceramic coating material and a preparation method thereof which are mainly applied in lithium battery production. The alkali resistant ceramic coating material is characterized by being formed by mixing the raw materials including composite powder, a binding agent and an additive, and the raw materials comprise, by mass, 50 parts of the composite powder, 10-40 parts of the binding agent and 15-40 parts of the additive. The alkali resistant ceramic coating material has the advantages that the coating is good in alkali resistance, capable of being fired in a wide temperature range and low in preparation cost.

The invention discloses a PVC sheet shield tunnel segment inner corrosion prevention system with linings. The system comprises a plurality of lining segments and the corrosion prevention linings embedded in the inner walls of the lining segments. The lining segments and the corrosion prevention linings are spliced together and constructed into the tubular shape in a lining mode. Joints are formed between the lining segments. The corrosion prevention linings are connected into a whole in a lap joint mode through hot melting and embedded in the inner walls of the lining segments. The corrosion resistance of the segment structure is greatly enhanced. After the lining segments are spliced, hot melting and lap joint processing is conducted on local parts without corrosion prevention linings such as the seams between the corrosion prevention linings and holes in the corrosion prevention linings, and it is ensured that the shield tunnel has the reliable overall leakproofness. Materials of the segment structure are convenient to take, the construction process is mature, and the construction cost is not high; for a water drainage pipeline formed by the lining segments under the sewage environment, corrosion of corrosive substances to the segment structure is isolated, the defect that the shield tunnel is prone to leakage at the seams of the segments is eliminated, and good application prospects are achieved.

The invention relates to a method for processing a porous material by hydrogenated silicon oil, which comprises the following steps: taking 0.1-0.8% of hydrogen amount-containing hydrogenated silicon oil and cooperating with a silane coupling agent and an aqueous solvent to prepare a water-dilutable hydrogenated silicon oil processing agent, performing heat treatment, performing pumping filtration and drying on the surface of the porous material, and on internal porosity. The hole of the processed porous material is not sealed, the processed porous material has super-hydrophobicity, can effectively isolate the erosion of corrosion mediums such as aqueous vapor and pollutants on the material, can be used for surface treatment on the porous materials such as metals, inorganic silicate and an organic polymer, and can ensure the stabilization of the performances of porosity and machinery intensity in various environment. The processing method can be used for protecting porous materials such as heat insulation materials, sound-insulation sound-absorption materials and low-density structure materials.

The invention provides a gas turbine without a main shaft. The gas turbine is characterized by comprising a housing, a rotor assembly, a stator assembly and a bearing assembly, wherein the rotor assembly and the bearing assembly are mounted in the housing, the bearing assembly supports the rotor assembly, and the stator assembly is connected with the housing; the rotor assembly comprises a rotor ring and a plurality of rotor blades, the rotor blades are arranged on the rotor ring, and the rotor ring is arranged on the housing; and the stator assembly comprises a rim and a plurality of guide blades, the guide blades are arranged on the rim, and the rim is arranged on the housing. The gas turbine has the advantages of being small in occupied space, high in energy conversion efficiency, largein output mechanical power, small in vibration and the like, and is particularly suitable for being applied to the engine technology of a new generation of advanced aerospace vehicles and modern civil airliners.

A downhole quartz resonant pressure sensor, which includes a cylindrical housing, a quartz crystal resonator and a bracket arranged in the housing, the quartz crystal resonator is embedded in the bracket, and the bracket is fixedly installed in the housing; the housing There is a screw hole in the center of one end of the housing, and a fine-tuning screw is inserted into the screw hole. The other end of the housing is provided with a pressure detection window. The pressure detection window is sealed with an elastic metal diaphragm. Corresponding to the center of one side of the shell, there is a convex column; the quartz crystal resonator is an open ring sheet-shaped 4.992MHz quartz crystal resonator with a fifth-order overtone thickness shear vibration mode, and a quartz crystal resonator is welded on it. For the sealed lead-out ends of the electrodes passing through the shell; the corresponding ends of the fine-tuning screw and the protruding post are respectively inserted into the bracket, and the force-sensitive points of the quartz crystal resonator are in contact with the corresponding end faces of the fine-tuning screw and the protruding post respectively.

The invention discloses a preparation method of a super-high temperature antioxidation graphite die. The method comprises the following steps: 1) cleaning a processed graphite die blank sample, dryingthe processed graphite die blank sample, and performing calcinations; 2) employing a graphite die antioxidation pretreatment agent for dipping the graphite die blank sample; 3) performing high-temperature solidification on the graphite die blank sample, 4) coating the surface of the graphite die blank sample with a silicon carbide slurry, after air drying, performing heat treatment on the graphite die blank sample, and cooling the graphite die blank sample to room temperature to prepare the graphite die blank sample having a silicon carbide transition layer; and 5) coating the surface of thegraphite die blank sample having the silicon carbide transition layer with a high-temperature ceramic paint, after air drying, performing heat treatment on the graphite die blank sample, and cooling the graphite die blank sample to room temperature to obtain the super-high temperature antioxidation graphite die. The super-high temperature antioxidation graphite die has the advantages of good thermal shock stability, high temperature resistance and antioxidation performance, and after usage for 200 h at the temperature of 2000 DEG C, the graphite die sample is intact.