35results about How to "No need to break" patented technology

The invention discloses a method for preparing an Al2O3 / TiC coated hard alloy based on a liquid phase sintering process, which is characterized in that the Al(OH)3 / Ti(OH)4 core / shell structure sol is firstly prepared by a liquid phase method , and then spin-coated on the surface of the solid-phase sintered cemented carbide blank with a density of 85% to 95% to form an Al2O3 / TiO2 layer, and then use the CO atmosphere in the liquid-phase sintering process to undergo a carbothermal reduction reaction with the surface layer to make TiO2 Converted to TiC, and finally produced Al2O3 / TiC coated cemented carbide. The process of the invention is simple, easy to control, and avoids the problem of step-by-step vapor deposition of two coatings in the manufacturing process of Al2O3 / TiC coated hard alloy, and the step-by-step problem of coating treatment and substrate preparation, based on liquid phase sintering The process prepares Al2O3 / TiC coated cemented carbide in one step.

The invention discloses a copper-containing sludge sintering method, comprising: igniting a primer layer and moving the primer layer from a first end to a second end; during the movement of the primer layer, at least Two feeding points, the material to be sintered is added in layers and layers; and the oxygen-containing gas flow is fed from the bottom of the primer layer to realize combustion support; wherein, the material to be sintered is added to the bottom fire layer at the first charging point near the first end After that, each feeding point is sequentially fed to the previous feeding layer to form a multi-layer feeding layer; the material to be sintered is a mixture of copper-containing sludge and fuel, or a pellet made of the mixture; the first feeding point is charged or before each subsequent feeding point, the primer layer or the previous feeding layer has been fully ignited; The temperature of the upper part of the layer is determined; the oxygen-containing gas stream is formed by mixing a part of the flue gas passing through the material layer with the new oxygen-containing gas stream.

Provided are a coated magnetic abrasive particle and a preparation method thereof. The iron ion based molar ratio of iron dichloride to ferric chloride of the coated magnetic abrasive particle is 1 to 1-3, the molar ratio of Fe ions to ammonia water ammonia ions is 1 to 2-7, the mass ratio of ferroferric oxide to a modifying agent is 1 to 5, an ethyl alcohol-water solution is prepared according to the ethyl alcohol-water proportion of 1 to 5, and the volume ratio of tetraethoxysilane to the solution is 1 to 20-30. Preparation is performed according to the volume ratio of ammonia water to the solution. The preparation method comprises the preparation steps that 1, the iron dichloride, the ferric chloride, the ammonia water, the modifying agent, ethyl alcohol, the tetraethoxysilane and distilled water are weighed; 2, the distilled water and the ferric chloride and the iron dichloride are mixed and prepared into a solution; 3, the ammonia water is added for stirring; 4, drying is performed; 5, a drying product, an activator and distilled water are prepared into a solution, and dispersion is performed; 6, the alcohol-water solution is added for stirring; 7, the tetraethoxysilane is dropwise added; 8, the ammonia water is dropwise added and is stirred; 9, drying is performed after product suction filtration. The coated magnetic abrasive particle is low in cost and easy to recover.

The invention discloses a device and method for simulating influences of underground water on coalbed methane. The device comprises a sample bin and a high pressure gas bottle. The sample bin is mainly composed of a pressure tank. The whole pressure tank is in a cylindrical shape and formed by separably combining two semicylinders. The pressure tank is provided with a pressure meter and a gas-water separator. The pressure tank and the high pressure gas bottle are communicated. The device and method are simple, effective, applicable to large-size coal samples without breaking and capable of adapting to inspecting influences of different pressure, water qualities, coal qualities and coal-water ratios on coalbed methane storage.

The invention discloses a retractable segment for being removed in a tunnel and a construction method. The problems of difficult removal and unrepeatable use of a shield segment are solved, and by arranging telescoping members and moving wing plates at the positions of top sealing blocks, the segment can be removed in the tunnel without breaking and can be reused. According to the technical scheme, the retractable segment comprises a plurality of standard blocks which are connected to form an arc-shaped structure in an adjacent surrounding mode, adjacent-connecting blocks are closely attachedto both ends of the arc-shaped structure, the top sealing blocks are arranged between the adjacent-connecting blocks, and the standard blocks, the adjacent-connecting blocks and the top sealing blocksconstitute a cylindrical structure; and the moving wing plates are arranged on the two sides of the top sealing blocks, the telescoping members are arranged in the top sealing blocks, the telescopingmembers are connected with the moving wing plates, and the telescoping members can drive the moving wing plates to rotate or move to abut against the adjacent-connecting blocks.