43results about How to "Change microstructure" patented technology

The invention relates to a synthesis method of an MOR (Mordenite)-BEA (Beta Zeolite) core-shell zeolite and mainly aims to solve the problem of low coverage rate of shell phase zeolites on core phase zeolites in the prior art. The problem is better solved by using the technical scheme that the synthesis method comprises the following steps of: (1) treating MOR serving as core phase zeolite by using acid, and then, filtering to obtain MOR I; (2) adding the MOR I into a modifying agent solution with the concentration of 0.1-20wt%, treating the MOR I for 0.5-24h, filtering and drying to obtain MOR II; (3) adding the MOR II into a solution containing nano BEA to obtain MOR III; and (4) adding the MOR III into a solution containing a silicon source, an aluminum source and a template R, crystallizing, and then, filtering, cleaning, carrying out ammonium exchange and drying to obtain the MOR-BEA core-shell zeolite. The synthesis method can be used for industrial production of the MOR-BEA core-shell zeolite.

A method and application for controlling Co-based amorphous fibers to form a core-shell structure, belonging to the technical field of functional materials. In order to obtain a Co-based amorphous fiber with a multiphase composite structure of nanocrystalline core-amorphous shell, so that it has better mechanical and giant magnetoresistance properties, the present invention provides a controlled Co-based amorphous fiber The method for forming the core-shell structure is to prepare raw materials according to the element content of each component in the Co-based amorphous fiber, and to prepare the Co-based amorphous fiber by using the melt drawing method, and to carry out a step-by-step DC current on the Co-based amorphous fiber. Annealed to obtain composite structure amorphous fibers with core-shell structure. The Co-based amorphous fiber with a core-shell structure prepared by the invention can be used to prepare a magnetic sensor.

The invention relates to a slide plate refractory with silicon nitride added and a production method thereof. The slide plate is prepared by the following raw materials in percentage by weight: 45-65% of corundum, 10-25% of zirconia-mullite and / or zirconia-corundum, 2-8% of silicon nitride, 6-18% of alumina fine powder and the balance one or more of silicon metal, carbon black and graphite powderand a phenolic resin binder accounting for 4-6% of the total above raw materials. The production method is characterized by proportionally weighing the raw materials, uniformly mixing the raw materials, obtaining the mixture through mixing, press-forming the mixture, drying the formed mixture at 190-210 DEG C for 6-10h and then carrying out nitridation firing on the dried mixture at1200-1400 DEG C. The invention has the following benefits: by adding silicon nitride and reasonably adding other components according to the amount and ratios, the slide plate composite material with structure of Al2O3-ZrO2-Si3N4-C is formed, and the oxidation resistance of the slide plate is improved; and the apparent porosity of the refractory is 1-4%, the cold compression strength is 150-220MPa, the high temperature rupture strength is 28-33MPa and such performance indexes as the oxidation resistance, the scouring resistance, the thermal shock resistance and the like are all excellent or good.

A water-soluble phosphate rock powder and a preparation method thereof. The water-soluble phosphate rock powder is a porous hydrophilic particle that can be quickly dispersed in water, and phosphorus and trace elements therein can be well dissolved in water, and can be used as A water-soluble phosphate fertilizer. After the water-soluble phosphate rock powder is applied to the soil, its porous structure can increase the contact area with the microorganisms in the soil, significantly shorten the release time of phosphorus in the phosphate rock powder in the soil, provide nutrients for crops, and promote crop growth. The trace elements in it can improve the quality of crops; the preparation method of the present invention adopts the laser drilling method, the production process is simple, and there is no pollution to the environment. The utilization rate of ore powder is improved, which has a broad market prospect.

The invention relates to a preparation method of core-shell molecular sieve MOR / BEA (mordenite / bromoethylamine) and mainly solves the problem that a core-shell molecular sieve layer is low in coverage in the prior art. The preparation method includes: firstly, pre-processing mordenite to obtain mordenite I; secondly, adding the mordenite I into solution of nano beta-zeolite, and adhering nano beta-zeolite seed crystal to the surface of the mordenite I to obtain mordenite II; and thirdly, adding the mordenite II to solution containing silicon source, aluminum source and template R to allow for crystallization, and performing filtration, washing, ammonium exchange and drying after crystallization to obtain core-shell molecular sieve MOR / BEA. The problem is solved well by the application of the technical scheme. The preparation method is applicable to industrial production of core-shell molecular sieve MOR / BEA.

The invention discloses a method for improving low-carbon aluminum killed steel blank hot cracks by adopting low-voltage pulse current, belonging to the technical field of improving the steel blank hot cracks. According to the method disclosed by the invention, when a low-carbon aluminum killed steel blank is cut by a continuous casting machine, pulse current is applied to the low-carbon-aluminum killed steel blank; the pulse current parameters are as follows: the pulse voltage is 21-35 V, the pulse current is 35-100 A and the pulse frequency is 20-50 Hz; and low-carbon aluminum killed steel is the aluminum killed steel with omega[C] which is less than 0.25%, wherein omega[Al] is more than or equal to 0.01% and less than or equal to 0.40%. According to the method disclosed by the invention, the low-voltage pulse current is adopted, microcosmic tissues of the low-carbon aluminum killed steel blank are changed, and the high-temperature mechanical property of a casting blank is improved, so that the hot cracks of the casting blank are effectively reduced; and the normal production is not influenced by the method, the existing production process does not need to be changed, alloy elements do not need to be added, temperature-reduction treatment does not need to be carried out on the casting blank, no pollution to the casting blank and equipment is generated, and no harms on workers are formed, so that the method is an environment-friendly, safe and new technology for reducing defects of the casting blank.