30results about How to "Excellent abnormal temperature mechanical properties" patented technology

The invention discloses a nano water-based functional ceramic composite coating which comprises raw materials in parts by weight as follows: 10-35 parts of silicate inorganic adhesives, 10-35 parts of main filler, 2-10 parts of stabilizing materials, 5-20 parts of toughness-enhancing emulsion type binding agents, 3-10 parts of film forming assistants and 5-25 parts of water. A preparation method comprises the steps as follows: the silicate inorganic adhesives and diluent are poured into a container and stirred at 350-400 r/min for 10-20 min, so that a mixed liquid is obtained; the main filler and the stabilizing materials are added to the mixed liquid, and the mixture is stirred at 350-400 r/min for 50-60 min; and the toughness-enhancing emulsion type binding agents and the film forming assistants are added sequentially, and the mixture is filtered by gauze with 400-600 meshes, so that the composite coating is obtained. A film of the coating is formed at the normal temperature, and the nano water-based functional ceramic composite coating has the characteristics of infiltration, large adhesive force, high density, stone hit resistance, impact resistance, high and low temperature resistance, superior abrasion resistance, washing resistance and good flexibility.

The invention provides a novel zinc alloy for a bearing and a corresponding pressure casting and heat treatment process. The pressure casting and heat treatment process comprises the steps of raw material preparation, melting, and pressure casting and heat treatment and the like. The zinc alloy is excellent in mechanical performance, especially the strength and the hardness suitable for a heavy-load and high-temperature environment. The pressure casting and heat treatment process of the zinc alloy specifically comprises the following steps: preparing raw materials through a proper amount of simple alloy elements; obtaining a casting through a proper melting process and subsequent pressure casting; and subjecting the casting to heat treatment and obtaining the zinc alloy, wherein the elements, the melting process, the pressure casting process parameters and the heat treatment process parameters of the alloy are all optimized to obtain a product with excellent performance.

The invention discloses high-strength alloy which is prepared from the following components in percentage by mass: 3.5-4.25 percent of iron, 8.2-10.39 percent of nickel, 2.5-3.7 percent of manganese, 1.12-1.38 percent of boron, 0.2-0.33 percent of tellurium, 2.5-3.8 percent of tungsten, 0.44-0.62 percent of platinum, 0.18-0.25 percent of scandium, 0.12-0.22 percent of holmium, 0.13-0.19 percent of rhenium and the rest of aluminum. The alloy is prepared by vacuum melting, refining, pressure casting, heat treatment and aging. Due to the reasonable preparation of components and contents, the aluminum alloy has enough mechanical property, particularly the mechanical property suitable for heavy load and high temperature usage environments; meanwhile, the process parameters of pressure casting and the pressure parameters of inert gases during refining are optimally selected, and the mechanical property of the alloy is improved.

The invention discloses a heat treatment method for improving the locking performance of a GH738 self-locking nut. The method comprises the steps that after solid and solution state raw materials areforged into a blank, high-temperature short-time annealing treatment is conducted, crystalline grains refined by forging of the surface layer of the blank are adjusted to the 2-6 level range of standard requirements, the deformation strengthening effect produced by forging is kept to the greatest extent at the same time, and after stabilization and aging treatment, the strength of the product is improved by one level compared with a conventional heat treatment method. In addition, the relatively fine crystalline grain size can be obtained through short-time heat treatment, and the coarse crystalline grain phenomenon caused by long-time heat preservation is avoided.

The invention relates to a preparation method of an alumina-based foamed ceramic spherical shell for civil air defense engineering. The preparation method comprises the following steps: preparing a pug by taking 67-80 wt% of alumina powder, 15-18 wt% of Guangxi white mud and 5-13 wt% of kaolin as raw materials, adding 10-15 wt% of a binder, 10-40 wt% of water and 40-80 wt% of a pore-forming agentand performing uniform mixing; filling the pug into a hemispherical shell mold with the outer diameter of 8-12 cm and the inner diameter of 4-6 cm, pressing the pug into a hemispherical shell green body under the pressure of 1-4 Mpa, butting and combining the side openings of hemispherical shells into a hollow sphere under the same pressure to form a hollow sphere, and demolding the hollow sphere;firstly curing the hollow sphere for 2-5 h at 25 DEG C, then drying the hollow sphere for 6-12 h at 60-110 DEG C, then putting the hollow sphere in an air atmosphere, heating the hollow sphere to 1100-1300 DEG C at a speed of 1-5 DEG C/min, keeping the temperature for 1-2 h, and performing sintering and sealing to obtain the alumina-based foamed ceramic spherical shell. The raw materials used inthe invention are cheap and easy to obtain, the production efficiency is high, no byproduct is produced in the production process, safety and environmental protection are achieved, automatic production can be achieved, and the alumina-based foamed ceramic spherical shell prepared in the invention is high in strength, uniform in wall thickness and controllable in density, wall thickness, sphere size and normal-temperature mechanical properties.

The invention relates to a preparation method of a forsterite-based foamed ceramic spherical shell for civil air defense engineering. According to the technical scheme, the preparation method comprises the following steps: uniformly mixing 67-85 wt% of forsterite powder, 5-10 wt% of sericite powder, 3-13 wt% of silicon micro-powder, 10-15 wt% of a binding agent, 10-30 wt% of water and 8-15 wt% ofa pore-forming agent to obtain a mud material; filling a hemispherical shell mold with an outer diameter of 6-10 cm and an inner diameter of 3-5 cm with the mud material, pressing into a hemisphericalshell billet under 5-10 Mpa, butting and combining the edge openings of the hemispherical shells into a hollow sphere under the same pressure, and demolding; and curing at 25 DEG C for 2-5 hours, then drying at 60-110 DEG C for 6-12 hours, then putting in an air atmosphere, heating to 800-1000 DEG C at a speed of 1-10 DEG C/min, keeping the temperature for 1-2 hours, and sintering and sealing toobtain the forsterite-based foamed ceramic spherical shell. According to the invention, the raw materials used in the method are cheap and easy to obtain, the sintering temperature is low, the production efficiency is high, and automatic production can be achieved; and the forsterite-based foamed ceramic spherical shell prepared through the method is uniform in wall thickness, high in strength andcontrollable in density, wall thickness and sphere size.

The invention discloses Cr-containing steel for wire line core drilling and a manufacturing method thereof, and the manufacturing method is characterized by controlling the content of C, Si, Mn, Cr, Mo, V, Ti and Cu reasonably, using nitrogen in the steel effectively, depending on precipitation strengthening of V and Ti, adopting an appropriate deoxidization method, enhancing the toughness and guaranteeing the purity of the steel at the same time of refining grains, adopting the heat treatment process of tempering after rolling and utilizing bainite as the main structure, which enables the steel to have the performance of resisting cracks and delaying crackling. The yield strength of the steel is greater than 740MPa, the tensile strength is greater than 880MPa, the elongation rate is greater than 13 percent, the performance meets the use requirements of DZ75 steel grade, the steel has the production advantage of saving procedures and the cost advantage of saving energy, the mechanical property at room temperature is superior to that of steel that does not contain Cr, and the comprehensive properties of the product can compete with the comprehensive properties of imported products of the same steel grade, therefore, the product has good application prospect.

The invention discloses an easy-to-use and energy-saving integrated silicon carbide ceramic pot, which is characterized in that 5-8 circles of uniformly distributed circular arc grooves are formed inthe upper end face of circular arc of the outer pot body, each circle of circular arc groove is provided with an annular heating wire therein, the upper half of each heating wire is arranged in a circular arc concave hole in the middle of the lower end surface of the circular arc of the inner pot body, the circular arc hole bottom surface of the circular arc concave hole is pressed together withthe upper end of each heating wire; the outer pot body and the inner pot body are made of black silicon carbide ceramic by hot pressing sintering, the right end of the outer pot body is provided withan integrated lower half pot handle, the lower end of the circular arc bottom surface of the outer pot body is provided with an integrated cylindrical pot holder, and a knob switch is arranged at theupper end of a round through hole in the middle in the longitudinal direction of an upper half pot handle on the right end of the inner pot. Food can be cooked directly by only using the easy-to-use and energy-saving integrated silicon carbide ceramic pot without the need for a stove, thereby not only saving the cost of buying the stove and the space occupied by the stove, but also saving electricity; besides, the easy-to-use and energy-saving integrated silicon carbide ceramic pot is lightweight and easy to use.

The invention discloses a heat-dissipation rear end cover for a servo motor, and the heat-dissipation rear end cover comprises a rear end cover, a seat, and a shaft hole. One side of the rear end cover is fixedly connected with a fixed lug, and the other side of the rear end cover is fixedly connected with a heat dissipation ring. The surface of the rear end cover is fixedly provided with heat dissipation holes, and one side of the heat dissipation holes is fixedly connected with a boss. One side of the box is fixedly connected with a carbonized ceramic layer, and one side of the carbonized ceramic layer is fixedly connected with a blocking shoulder. One end of the boss is fixedly connected with a blower fan, and one side surface of a fixed lug is fixedly connected with a rubber pad. The surfaces of the heat dissipation holes are fixedly connected with a filter screen. According to the invention, the heat dissipation ring is used for increasing the heat dissipation area, and the heat dissipation ring is made of copper, thereby speeding up the heat dissipation. The blower fan improves the heat dissipation effect of the motor, and the filter screen can effectively prevent a large amount of dust in the air from entering the inner cavity of the rear end cover, thereby enabling the motor to output power stability during operation.

The invention discloses a zinc alloy for pressure casting and a preparing method and application of the zinc alloy. The zinc alloy is prepared from, by mass, 4.15%-4.35% of iron, 11.1%-11.5% of zinc, 9.23%-9.45% of copper, 1.05%-1.20% of molybdenum, 0.36%-0.42% of selenium, 0.36%-0.39% of indium, 1.23%-1.28% of gallium and the balance aluminum. The zinc alloy for pressure casting is prepared through vacuum melting, refining, pressure casting, heat treatment, aging and the like. As all the ingredients and all the contents are reasonably set, it is guaranteed that the zinc alloy has the enough mechanical performance, and particularly has the mechanical performance suitable for the heavy-load and high-temperature use environment; and meanwhile the technological parameters of pressure casting and the pressure parameters of inert gas during refining are optimally selected, and the mechanical performance of the alloy is improved. The zinc alloy has the excellent normal-temperature mechanical performance, use requirements can be still met even under the condition that the temperature is higher than150 DEG C, and the zinc alloy is suitable for manufacturing pressure castings under the high-temperature and heavy-load working condition.

The invention discloses a convenient and hygienic integrated hot pot. The main features are: there are 3 to 6 circular arc grooves evenly distributed on the surface of the inner pot on the lower end of the outer pot body, and one ring-shaped heating wire is arranged in each round of arc grooves. The upper part of each heating wire is arranged in the arc concave hole in the middle of the arc inner pot bottom at the lower end of the inner pot body, and the arc hole bottom surface of the arc concave hole is pressed together with the upper end of each heating wire; The inner wall circle of the outer wall of the pot body and the outer wall circle of the inner pot wall of the inner pot body are firmly glued together with "instant adhesive 920", and the upper end circle of the outer pot wall is connected with the upper end of the inner pot wall. The circumference is riveted together with 4 to 8 evenly distributed copper rivets, and the outer pot body, inner pot body and heating wire are riveted into an integrated hot pot; the center of the inner pot cavity of the inner pot body is provided with a chopstick barrel with an integrated structure , The upper end of the chopsticks barrel is provided with a disc-shaped spoon holder with an integral structure. The invention is convenient and hygienic to use.

The invention discloses super-hard zinc alloy for die casing and a preparation method and application of the super-hard zinc alloy. The zinc alloy is prepared from, by mass, 18.1%-22.5% of zinc, 3.5%-5.5% of cobalt, 11.5%-15.5% of iron, 4.3%-7.4% of copper, 1.2%-3.6% of phosphorus, 3.3%-5.4% of chromium, 0.3%-2.5% of manganese, 0.2%-1.7% of silicon, 0.1%-0.9% of sulfur, 1.1%-2.2% of molybdenum, 0.3%-0.7% of selenium, 0.1%-0.6% of indium, 1.3%-2.3% of gallium and the balance aluminum. According to the super-hard zinc alloy for die casing and the preparation method and application of the super-hard zinc alloy, all the elements and the contents of all the elements are proportioned reasonably, and it is guaranteed that the zinc alloy has the sufficient mechanical property; the zinc alloy not only has the excellent normal-temperature mechanical property but also can still meet use requirements under the condition that the temperature is higher than 150 DEG C, and the zinc alloy can particularly meet the hardness requirement of die-case pieces under high-temperature and heavy-load working conditions.

The alloy rolling pipe of the present invention is widely used in the petrochemical industry and belongs to the field of metallurgical manufacturing. By adding an appropriate amount of alloy elements such as Mn, Cr, Ni, Ti, Al, and trace rare earth elements to the smelting raw materials, the alloy rolling pipe is greatly improved. The normal-temperature mechanical properties of the tubes, as well as the high-temperature short-term mechanical properties and high-temperature durable properties have also been newly improved, which can meet the urgent needs of the petrochemical industry for raw materials for heating tubes, furnace tubes and heat-resistant components, and at the same time save the country A lot of foreign exchange.