10results about How to "Uniform and dense microstructure" patented technology

The invention relates to a high-etching-resistance yttrium-magnesium complex-phase transparent ceramic and a preparation method and application thereof.The preparation method comprises the following steps that magnesium oxide and yttrium oxide are mixed according to a preset proportion to obtain a base material, yttrium-containing fluoride is added to serve as a sintering aid, the adding mass of the yttrium-containing fluoride accounts for 1-10% of the mass of the base material, and the base material is sintered to obtain the high-etching-resistance yttrium-magnesium complex-phase transparent ceramic; forming a multiphase ceramic green body; and sintering the multiphase ceramic green body in an inert oxygen-free atmosphere to obtain the yttrium-magnesium multiphase transparent ceramic with high etching resistance, the etching depth of the yttrium-magnesium multiphase transparent ceramic with high etching resistance is 300 to 500 nm / h. Compared with the prior art, the yttrium-containing fluoride is adopted as the sintering aid, a stable protective fluorinated layer is formed on the surface of the ceramic, the etching resistance of the ceramic is improved, meanwhile, the risk of decomposition and impurity introduction in an etching environment is avoided, and the high-etching-resistance yttrium-magnesium complex-phase transparent ceramic is particularly suitable for etching equipment in semiconductor manufacturing.

The invention belongs to the technical field of optical fibers, and particularly discloses application of microcrystalline glass in an optical fiber ferrule and an optical fiber connector. The glass ceramic comprises the following components in percentage by weight: 50 to 80 percent of SiO2 (silicon dioxide), 5 to 40 percent of Al2O3 (aluminum oxide), 8 to 30 percent of Li2O (lithium oxide) and 0.1 to 3 percent of a strength additive, the strength additive is one or more of a rare earth metal compound, a transition metal compound, organic fibers, borate, phosphate, magnesium oxide or magnesium fluoride. According to the invention, the microcrystalline glass added with the strength additive is used as an insertion core material of the optical fiber connector, so that the optical fiber connector can show higher environmental stability and higher thermal shock resistance in an extremely high temperature environment, and performance fluctuation caused by high temperature thermal expansion and thermal cycle impact is reduced; and the method can be applied to high-temperature fields such as high-power laser and the like and fields with large environment temperature change.

The invention discloses a self-adaptive control system and method for neodymium-iron-boron sheet production, and relates to the technical field of material preparation and processing.The self-adaptive control system comprises a smelting analysis module, a rotating speed analysis module, an iron-boron alloy powder particle analysis module, a sintering temperature and duration analysis module, a neodymium-iron-boron sheet quality analysis module and a database; according to the method, various historical customer orders are combined, the appropriate smelting temperature and duration of the customer orders and the viscosity of neodymium iron boron alloy liquid based on the customer orders are obtained through analysis, the rotating speed of a melt-spinning machine is analyzed, parameters such as pressing pressure, sintering temperature and duration are determined according to the granularity of neodymium iron boron alloy powder, and finally the quality of the neodymium iron boron sheet is analyzed. And due to high intelligence and automation, the production efficiency is greatly improved, and the quality and consistency of products are ensured.

The invention belongs to the technical field of stainless steel smelting, and particularly discloses a cooling structure based on automobile part die-casting and a cooling method thereof.The cooling structure based on automobile part die-casting and the cooling method thereof.The cooling structure based on automobile part die-casting and the cooling method thereof comprise the following steps that S1, a cooling cavity is designed; s2, mounting a cooling pipeline; s3, configuring a cooling medium circulating system; s4, preparation before die casting; s5, cooling in the die casting process; s6, treatment before demolding; s7, a cooling system is maintained and maintained; according to the invention, the temperature of the die-cast automobile part can be rapidly reduced, and the cooling time is shortened, so that the production takt is accelerated, the overall production efficiency is improved, the rapid cooling effect is achieved, the formation of a more compact and uniform microstructure is facilitated, the strength, hardness, wear resistance and other performance indexes of the part are enhanced, and the production cost is reduced; and meanwhile, the thermal fatigue damage of the mold is reduced, the service life of the mold is prolonged, the mold replacement and maintenance cost is reduced, high adaptability is achieved, and the requirements under different production conditions are met.

The W5Si3-WSi2 / WC composite material comprises the following components in parts by weight: a W5Si3 intermetallic compound and a WSi2 intermetallic compound are used as reinforcing and toughening phases; wC is used as a matrix; al2O3 powder; y2O3 powder; a phenolic resin binder; the spark plasma sintering preparation method comprises the following steps: step 1, preparing W-Si intermetallic compound powder A; secondly, the W-Si intermetallic compound powder A is subjected to heat treatment, and then W5Si3 intermetallic compound powder is obtained; step 3, preparing W-Si intermetallic compound powder B; 4, the W-Si intermetallic compound powder B is subjected to a heat treatment process, and WSi2 intermetallic compound powder is obtained; fifthly, W5Si3-WSi2 / WC composite powder is prepared; step 6, preparing a W5Si3-WSi2 / WC composite powder prefabricated blank wafer sample; step 7, putting the W5Si3-WSi2 / WC composite powder prefabricated blank wafer sample into a discharge plasma sintering furnace, and carrying out vacuum discharge plasma sintering on the W5Si3-WSi2 / WC composite powder prefabricated blank wafer sample; the W5Si3-WSi2 / WC composite material has the advantages of high preparation efficiency and simple process, and the W5Si3-WSi2 / WC composite material has high density and high mechanical properties.

The invention provides a laser vibration cladding device and a method thereof.The device comprises an annular heating cover and an infrared focal plane detector which are arranged in a working cabin with a laser cladding head, and a plurality of independently-controlled infrared heating units evenly distributed in the circumferential direction of the annular heating cover are arranged on the annular heating cover; a workpiece clamping position is arranged below the circle center of the annular heating cover, and the infrared heating units all point to the workpiece clamping position. A multi-channel coaxial powder feeder is further arranged in the working cabin, a plurality of independently-controlled powder bins are integrated in the multi-channel coaxial powder feeder, a powder feeding pipe of the multi-channel coaxial powder feeder is integrated with the laser cladding head, and powder in all channels is converged before entering the powder feeding pipe and conveyed to the laser cladding head through inert gas flow; and an ultrasonic generator, a piezoelectric transducer and a vibration transmission rod are also arranged in the working cabin.

The invention belongs to the field of preparation of inorganic non-metallic materials, and particularly relates to a preparation method of high-strength silicon carbide hollow spheres. The preparation method comprises the following steps: mixing silicon carbide powder, a binder, a curing agent and other raw materials to form precursor slurry, coating the surface of a polymer sphere by adopting a coating spraying method, and carrying out drying curing, degreasing treatment and high-temperature sintering to prepare the SiC ceramic hollow sphere. Key processes such as raw material component proportioning and sphere dispersity optimization are broken through, and the SiC ceramic hollow sphere with good sphericity and controllable particle size is successfully prepared. The SiC hollow spheres prepared by a'spray coating method 'not only have lower envelope density, but also have the maximum analogy strength up to 13.61 MPa.cm < 3 > / g which is obviously superior to that of commercially available Al2O3 hollow spheres, and the SiC hollow spheres prepared by the method are used as filler particles to hopefully prepare light and high-strength aluminum-based composite foam.

The invention relates to a Ti5Si3 / ZrB2 composite material which comprises Ti5Si3 intermetallic compound powder, and a Ti5Si3 intermetallic compound is used as a reinforcing and toughening phase; zrB2 is used as a matrix of the ZrB2 powder; al2O3 powder and Y2O3 powder are added as sintering aids; adding fine silicon powder as a sintering aid; the hot pressing sintering method comprises the following steps: preparing Ti-Si intermetallic compound powder by adopting a mechanical alloying process; the Ti-Si intermetallic compound powder prepared in the first step is subjected to heat treatment to prepare Ti5Si3 powder, and the Ti5Si3 powder and ZrB2 powder are mixed; the preparation method comprises the following steps: preparing Ti5Si3 / ZrB2 composite powder; preparing a compact Ti5Si3 / ZrB2 composite powder prefabricated blank through a pressure forming process; a Ti5Si3 / ZrB2 composite material is prepared through a hot pressed sintering process; the hot pressing sintering method has the advantages that the preparation efficiency is high, the preparation process is simple, the Ti5Si3 / ZrB2 composite material product can be rapidly sintered and manufactured, and the prepared Ti5Si3 / ZrB2 composite material has high density and high mechanical property.

The application provides a kind of anti-freezing high-performance concrete for building 3D printing and a preparation method thereof, the concrete contains cement 80-100 parts by mass, fly ash 80-100 parts, slag powder 220-270 parts, silica fume 15-30 parts, fine aggregate 1200-1500 parts, and polycarboxylic acid high-performance water reducing agent, thickening agent, polypropylene fiber and / or modified cellulose ether, water-binder ratio 0.55~0.67, fine aggregate is natural sand, granite waste sand or mixture thereof, replacement rate 0%~100%. During preparation, accurate measurement, dry mixing, solution preparation, wet mixing fluidization, high-speed slurry, printing forming and moisture curing are carried out. The application adopts microstructure self-optimization active anti-freezing design, without coarse aggregate, which greatly reduces carbon emission, the anti-freezing grade of concrete reaches F125-F150, with excellent printability and mechanical properties, without printing head blockage problem, the preparation process is controllable, and is suitable for building 3D printing engineering in cold and seasonal freeze-thaw areas.

The application discloses a kind of high stability alkali erosion resistant low-grade bauxite-coal gangue based corundum-mullite system of preparation application technology of complex refractory material.Electrofusion magnesia is innovatively introduced into low-grade bauxite-based corundum-mullite system in the application, effectively improving the overall structural stability of the composite material, and a high-performance erosion-resistant composite material with a compressive strength of 89.88 MPa and a bulk density of 3.16 g / cm³ is obtained. And through the modification of zirconium silicate and yttrium oxide, the alkali erosion resistance of the composite material can be greatly improved, so that the material can adapt to the strong alkali working environment of sodium ion battery positive electrode material synthesis, and has excellent comprehensive performance. The application realizes the efficient utilization of low-grade bauxite and coal gangue resources, and the prepared composite material has structural stability and alkali erosion resistance, and can be widely used in high-performance kiln car, furnace lining, crucible and furnace lining, etc. Refractory scene, has good practical value and industrial application prospect.