34results about How to "Reduce or avoid the formation of" patented technology

The invention discloses a spring steel, which comprises the following components in percentage by mass: 0.3 to 0.5 percent of C, 1.0 to 2.5 percent of Si, 0.3 to 1.5 percent of Mn, 0.1 to 1.0 percent of Cr, 0.01 to 0.30 percent of Ni, less than or equal to 0.15 percent of Cu, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities, wherein the spring steel can be manufactured into high-speed railway rail buckles by a processing method of cold forming. The invention also discloses a manufacturing and thermal treatment method of the spring steel. By the method, the yield strength (Rm) of the spring steel is more than or equal to 1,000MPa, the tensile strength (Rp0.2) is more than or equal to 1,200MPa, the elongationrate (A) is more than or equal to 6 percent, the section shrinkage rate (Z) is more than or equal to 30 percent, and the buckle requirements of high-speed railway rails are met.

The invention provides an ultrasonic vibration assistance laser boring method and device. The device comprises a power source, an ultrasonic generator, an ultrasonic vibration auxiliary device clamping unit, an ultrasonic vibration generation unit, a workpiece clamping unit and a laser generation unit; the power source is connected with the ultrasonic generator through a first electric wire, the ultrasonic generator is connected with the ultrasonic vibration generation unit through a second electric wire, a workpiece is mounted on the workpiece clamping unit, and when laser boring is carried out, ultrasonic vibration generated by the ultrasonic vibration generation unit can act on the workpiece in the direction perpendicular to the machining surface of the workpiece. A melting material ina hole can be discharged while laser boring is carried out, through the ultrasonic vibration assistance effect, removal of slag can be accelerated, the removal rate of the slag can be improved, the phenomenon that melt is solidified on the hole wall again to form a re-casting layer is reduced or avoided, meanwhile, ultrasonic vibration can obviously improve the hole wall surface quality, the laserboring quality can be improved, and the boring efficiency is improved.

The invention provides a method for nitridation and crystallization of metastable-state samarium-iron alloy. The method comprises the steps of performing rapid cooling and sudden condensation on molten-state samarium-iron alloy to obtain the metastable-state samarium-iron alloy; performing nitridation and initial crystallization on the metastable-state samarium-iron alloy to obtain nitrided samarium-iron alloy; and performing annealing and crystallization on the nitrided samarium-iron alloy to obtain a samarium-iron nitrogen permanent-magnet material. During nitridation of a metastable-state material, a large amount of rheological units existing in the metastable-state alloy are beneficial for diffusion and homogenization of nitrogen atoms, the nitridation content of the alloy can be remarkably increased, and the nitrogen atoms are uniformly distributed; crystallization is completed before decomposition of Sm<2>Fe<17>N<x>, nitride formation is reduced or prevented, and the metastable-state samarium-iron alloy has a refined microstructure; and moreover, according to the method provided by the invention, the nitridation speed is fast, and the nitridation efficiency of improving a samarium-iron nitrogen magnetic material by the samarium-iron alloy is improved.

The invention discloses a method for preventing zinc flow lines from appearing in the surface of galvanized strip steel. The method comprises the steps that before strip steel enters a zinc pot, the temperature of zinc liquid in the zinc pot is adjusted; according to the thickness of the strip steel, the pot inlet temperature of the strip steel is adjusted; the strip steel is controlled to enter the zinc pot to be subject to galvanizing. According to the method for preventing zinc flow lines from appearing in surface of galvanized strip steel, the technical effects that the zinc flow lines areprevented from appearing in the surface of the galvanized strip steel, and the attractiveness of the galvanized strip steel is improved are achieved.

The invention relates to a dish-washing machine exhaust system, which comprises a first air duct, a second air duct and an air extractor, one end of the first air duct is connected with an inner container of a dish-washing machine, the other end of the first air duct is connected with the air extractor, and a water box used for containing water is arranged in a skirting board area of the dish-washing machine and provided with an air inlet part and an air outlet part. The other end of the second air duct is connected with the air inlet part. According to the dish-washing machine exhaust system, high-temperature water vapor exhausted in the drying stage is subjected to water bath through the water box, the water vapor is fully condensed, the exhaust temperature and humidity are reduced, exposed condensate water is reduced or prevented from being formed in the follow-up exhaust process, and meanwhile the water box is reasonable in design and convenient for a user to disassemble and assemble.

The invention discloses a light attenuation resistant PERC single crystalline silicon solar cell aluminum paste. The aluminum paste is prepared from the following components in parts by weight: 70 to86 parts of aluminum powder, 0.5 to 2.5 parts of an inorganic binder, 10 to 24 parts of an organic binder and 0.1 to 1.5 parts of an inorganic auxiliary agent. The invention also discloses a preparation method of the aluminum paste. The preparation method comprises the following steps: firstly uniformly stirring the organic binder and the inorganic auxiliary agent, then adding the inorganic binderand the aluminum powder in sequence to be stirred uniformly, and finally grinding to obtain the aluminum paste. An PERC single crystalline silicon solar cell obtained by using the aluminum paste hasthe characteristics of high photovoltaic conversion efficiency and light attenuation resistance.

The invention provides an air conditioner indoor unit. The air conditioner indoor unit comprises a shell, an airflow actuating device and an air treatment device; the shell is provided with an air return opening, an air outlet and an air treatment channel located between the air return opening and the air outlet; the airflow actuating device is arranged in the air treatment channel and is configured to promote indoor environment air to flow into the air treatment channel from the air return opening to form treatment airflow, and the treatment airflow is blown out from the air outlet after being treated; and the air treatment device is arranged in the air treatment channel and comprises a body part made of an MOF material, and the body part is configured to adsorb specific substance components in the treatment airflow flowing through the surface and/or the interior of the body part. According to the air conditioner indoor unit, the body part made of the MOF material can adsorb multiple substance components, and therefore multiple harmful substance components in the indoor environment air can be absorbed only by arranging the body part in the air conditioner indoor unit, the air treatment capacity of the air conditioner indoor unit can be improved easily, the structure of the air conditioner indoor unit can be simplified, and the manufacturing cost is saved.

The invention discloses an oxygen-enriched gasification process for a circulating fluidized bed gasifier, which comprises the following steps: introducing a mixed gas, namely a gasifying agent, formed by mixing oxygen, water vapor and carbon dioxide or air into the fluidized bed gasifier; raw material coal is added into a gasification furnace and is subjected to gasification reaction with a gasification agent; crude synthesis gas containing carbon monoxide and hydrogen generated in the reaction and gasified fly ash are introduced into a cyclone separator together, most of the fly ash settles to enter the bottom of the cyclone separator and returns to the gasifier to be gasified again, and a small amount of the fly ash and the crude synthesis gas enter the next treatment section. According to the oxygen-enriched gasification method of the circulating fluidized bed, the temperature in the gasification furnace can be effectively controlled, and the problem that the bottom of the gasification furnace is prone to slagging due to local overheating is solved. In addition, due to the fact that all the components of the gasifying agent are gas capable of participating in the gasification reaction, controllable components of the coal gasification product crude synthesis gas can be achieved by regulating and controlling the proportion of all the components of the gasifying agent, and the gasifying agents with different component proportions can be matched according to feed coal with different coal quality characteristics.