35results about How to "Overcoming the disadvantage of being fragile" patented technology

The invention discloses a manufacturing method of a carbon/carbon crucible. The method comprises: performing layer-by-layer winding molding on carbon fiber on the surface of a core mold to prepare a crucible preform, performing crucible solidification and crucible densification treatments on the crucible preform to finally prepare the carbon/carbon crucible finished product with a density of 1.70 g/cm<3> or more. When in the winding process of the crucible preform, the carbon fiber winding angle between the first layer and the last but one layer on the core mold is 0-45 DEG, and the carbon fiber winding angle of the last layer is 0-90 DEG, the filament bundle of carbon fiber is 1-350 K, and after winding, the winding directions of two adjacent layers of carbon fiber are stagger. The manufacturing method of the carbon/carbon crucible overcomes heavy and frangible shortcomings of conventional graphite; and the manufactured crucible is uniform in distribution of the internal filament bundle, uniform in thickness, close in fitting between layers, excellent in integral physical properties and long in service life.

The invention discloses a water lubrication composite thrust bearing of a nuclear main pump. The water lubrication composite thrust bearing comprises a stainless steel tile base and an engineering plastic layer. The stainless steel tile base is provided with a concave-convex face connected with the engineering plastic layer. The concave-convex face and the engineering plastic layer are compositely molded through thermoplastic mould pressing. The specific value of the area of the concave-convex face to the area of the orthographic projection of the concave-convex face on the stainless steel tile base ranges from 1.2 to 2. The concave-convex face and the engineering plastic layer are combined through a concave face and a convex face of the concave-convex face and the specific bonding property obtained after fusion of a rough face and the engineering plastic layer, and the composite thrust bearing capable of being physically connected into a whole is formed. Respective advantages of metal and nonmetal can be brought into play, so that the thickness of the engineering plastic layer can be greatly reduced, and the bearing capability is improved; the size of the bearing still has good stability under the effect of pressure and temperature during running; a stable safety lubrication water film can be easily built; and the water lubrication composite thrust bearing is a novel water lubrication composite thrust bearing resistant to nuclear radiation, safe and reliable.

The invention discloses a lightweight high-strength elastic ceramic and a preparation method thereof, and belongs to the technical field of porous ceramic preparation, the lightweight high-strength elastic ceramic is formed by bonding ceramic nanowires to form a continuous porous layered network, and the lightweight high-strength elastic ceramic is prepared by taking ceramic nanowire aerogel as a raw material, the preparation method comprises the following steps: forming a layered structure, placing ceramic nanowire aerogel in a mold, and carrying out axial compression; welding the ceramic nanowires, and performing heat preservation treatment in the high-temperature oxygen-free environment, wherein the ceramic nanowires making contact with one another can be welded together through oxide layers on the surfaces of the nanowires so that the lightweight high-strength elastic ceramic is obtained.

A preparation method of zirconium oxide ceramic products adopts zirconium oxide powder as a raw material to make the zirconium oxide ceramic products, and comprises the following steps: mixing high-density zirconium oxide powder with a stabilizer and a binder, carrying out injection molding on the above obtained mixture, carrying out injection molding in a mold at a certain temperature under a certain pressure, cooling for solidification, demolding, and sintering the above obtained green bodies at a high temperature under a high pressure to obtain the zirconium oxide ceramic products with high strength and high toughness. The zirconium oxide ceramic products have the advantages of high strength, good wear resistance, high toughness, and unlikely breaking.

The invention discloses a composite fiber cement board structure which is characterized by comprising a fiber cement board layer, a wood board layer and an adhesive layer arranged between the fiber cement board layer and the wood board layer and used for bonding the fiber cement board layer and the wood board layer. According to the invention, through bonding of the wood board layer on the fiber cement board layer, the disadvantages of weak stress resistance and breakability of the fiber cement board layer are overcome, and the composite fiber cement board structure provided by the invention has the advantages of a light weight and high hardness and thus has a wide market prospect.

The invention belongs to the technical field of vegetable planting, and particularly relates to a simple type outdoor vegetable stereoscopic cultivation device. The simple type outdoor vegetable stereoscopic cultivation device comprises a cultivation plate body, the middle of the cultivation plate body is provided with a communication pipeline from top to bottom to form a drip irrigation pipe groove, and the lower end of the drip irrigation pipe groove is communicated with a drainage trench arranged horizontally; inclined truncated cone-shaped through holes are distributed in the side portionof the cultivation plate body, and the through holes are communicated with the drip irrigation pipe groove; a rain-proof ceiling covers the upper portion of the cultivation plate body, a high-level cistern is arranged on the upper portion of the rain-proof ceiling, a blow-off pipe of the high-level cistern is tiled along a length direction of the top of the cultivation plate body and connected with a drip irrigation nozzle on the portion corresponding to the drip irrigation pipe groove, and a water outlet of the drip irrigation nozzle is directly opposite to an inlet at the upper end of the drip irrigation pipe groove. The simple type outdoor vegetable stereoscopic cultivation device has the advantages that the disadvantage that a polyurethane foam board adopted by a traditional vegetablestereoscopic cultivation device is broken easily is overcome, thereby being capable of achieving convenient and fast planting of vegetables; not only can the quality of the planted vegetables be ensured, but also the problem of the root rot and death of the planted vegetables can be avoided.

The invention relates to a heat-insulation flame-retardant lightweight wall tile and a preparation method thereof. The wall tile comprises a glass fiber body, a modified asphalt coating and a facing material layer; the modified asphalt coating adopts the following raw material formula in percentage by weight: 40 percent to 60 percent of 10# petroleum asphalt, 3 percent to 5 percent of 90# road asphalt, 1 percent to 3 percent of a polyolefin processing modifier, 15 percent to 25 percent of magnesium hydroxide, 6 percent to 12 percent of rubber powder and the balance of filling; and the facing material layer adopts the following raw material formula in percentage by weight: 30 percent to 40 percent of hollow ceramic microbeads, 2 percent to 5 percent of powder butadiene styrene rubber and the balance of color sand. The wall tile disclosed by the invention has excellent corrosion resistance, waterproofness and aging resistance, high tensile strength and excellent cutting processing performance, is simple to construct, is attractive and elegant, particularly has excellent heat insulation and flame retardance performance and implements environmental-friendliness, energy conservation, safety and reliability of an external wall decoration material.

The invention discloses a MnCoNi oxide ceramic infrared sensitive element densifying method. According to the method, firstly, an infrared sensitive element slice to be treated is fixed through a pressing plate; secondly, the infrared sensitive element slice to be treated is placed in a graphite furnace; a densified infrared sensitive element slice can be obtained by controlling pressure and the temperature increasing speed; through verification, the obtained infrared sensitive element slice is low in porosity, and the noise and resistance value yield is high.

The invention discloses a high-boron low-alloy high-speed steel base WC40 steel-bonded hard alloy guide and guard roller and a manufacturing method thereof. The roller adopts a high-boron low-alloy high-speed steel base WC40 steel-bonded hard alloy comprising the following chemical components in percentage by mass: 0.2-0.6% of C, 5.0-7.0% of Cr, 2.5-3.0% of W, 1.5-3.0% of Mo, 1.5-2.5% of V, 0.5-1.0% of Nb, 0.3-1.0% of Si, 0.3-1.0% of Mn, 1.4-2.5% of B, 0.3-1.0% of Cu, 0.8-2.0% of Ni, S not more than 0.02, P not more than 0.02, 0.3-0.8% of CeO2, 40% of WC, and the balance of Fe. Then, the alloy is forged, annealed, machined, heated, grinded and inspected to finally prepare the guide and guard roller. The prepared steel-bonded hard alloy guide and guard roller has such excellent physical and mechanical properties as high hardness, wear resistance, high-temperature oxidation resistance and heat shock resistance, prolongs the service life of a guide roller, improves the rolled steel production efficiency and the product quality, is low in production cost, is higher in cost performance, and is higher in economic benefit and social benefit.

The invention discloses a high nickel chromium molybdenum alloy cast iron-based WC50 steel bond hard alloy guide roller and a preparation method thereof. The high nickel chromium molybdenum alloy cast iron-based WC50 steel bond hard alloy comprising, by mass, 2.9-3.5% of C, 1.2-2.7% of Cr, 0.3-0.7% of Mo, 0.8-2.0% of Ni, 0.3-0.6% of V, 1.0-1.8% of Si, 0.5-1.0% of Mn, less than or equal to 0.02% of S, less than or equal to 0.02% of P, 0.2-0.5% of Ce, 50% of WC, and the balance Fe is adopted. The alloy is forged, annealed, machined, thermally treated, grinded, and tested, and finally the guide roller is manufactured. The prepared steel bond hard alloy guide roller has excellent physical and mechanical properties of high hardness, wear resistance, high-temperature oxidation resistance, heat shock resistance and the like, the service life of the guide roller, the production efficiency of steel rollings and the production equality are improved, the production cost is low, and the cost performance is extremely high. The guide roller has great economic benefits and social benefits.

The invention relates to a novel lightweight wall tile. The wall tile includes a glass fiber blank, a modified asphalt coating and a facing material layer. The modified asphalt coating is prepared from, by weight, 40-60% of 10# petroleum asphalt, 3-5% of 90# pavement asphalt, 1-3% of polyolefin processing modifier, 13-23% of magnesium hydroxide, 8-14% of desulfurized reclaimed rubber and the balance fillers. The facing material is prepared from 30-40% of hollow ceramic microbeads, 2-5% of powdery butadiene styrene rubber and the balance colored sand. The wall tile has excellent corrosion resistance, water resistance and aging resistance and is high in tensile strength, excellent in trimming and processing performance, simple in construction, attractive, elegant and especially superior in thermal insulation and flame retardation performance, and an environment-friendly, energy-saving, safe and reliable external wall decoration material is obtained.

The invention discloses an adsorption system and method for VOCs solid-phase micro-extraction. The system comprises a gas mixing bottle, an extraction chamber, a flow meter, a high-pressure gas bottle, a tail gas absorption device and a gas chromatography flame ionization detector, wherein each high-pressure gas bottle is communicated with a gas inlet of the gas mixing bottle through a pipeline, the flowmeter is arranged on the pipeline between the high-pressure gas bottle and the gas mixing bottle, a gas outlet of the gas mixing bottle is connected with a gas inlet of the extraction chamber through a pipeline, a gas outlet of the extraction chamber is communicated with the tail gas absorption device, and the tail gas absorption device is used for absorbing mixed gas. The adsorption systemcan realize mixing of small-flow gas, and is good in extraction and adsorption effect, short in time, relatively low in detection limit, relatively high in recovery rate and good in reproducibility.

The invention discloses a manganese-oxygen compound three-dimensional porous material for removing formaldehyde and a preparation method thereof. The three-dimensional porous material comprises a manganese-oxygen compound and plant fibers, the manganese-oxygen compound is loaded on the plant fibers, and the plant fibers are crosslinked to form the manganese-oxygen compound three-dimensional porousspherical material. The preparation method of the porous material comprises the following steps: preparing a manganese-oxygen compound through a neutral reaction, then adding large-particle bamboo fibers into the manganese-oxygen compound, fully stirring and mixing, aging by a gel method, washing and freeze-drying to obtain the spherical material. The prepared spherical material has high porosityand high formaldehyde removal activity, and can be used for indoor formaldehyde pollution treatment.

The present invention relates to the field of building materials, especially to an energy-saving and environmental-protection material, a preparation method and an application of the energy-saving and environmental-protection material in building systems. The energy-saving and environmental-protection material comprises the following raw materials by weight: 60-90% of a glass hollow body, 5-25% of a bonding material, and 3-8% of water, wherein the materials are uniformly stirred and mixed, the glass hollow body is made from waste glass and is a sphere, and the glass hollow body and the bonding material are completely mixed according to a ratio of 1:(0.05-0.25), and then are added with water and stirred to prepare the energy-saving and environmental-protection material, wherein the energy-saving and environmental-protection material is applied in the building system so as to provide advantages of fire resistance, thermal insulation, water resistance, sound resistance, light weight, high strength and the like.

The invention relates to a ramming hammer which comprises a base and a covering plate, wherein a sealed space is formed between the base and the covering plate; the ramming hammer further comprises a steel frame and a crane rib welded on a base plate of the base, and concrete poured into the gap of the sealed space; wherein the crane rib runs through the covering plate and is welded with the covering plate integrally; and the crane rib is provided with a crane piece. The ramming hammer provided by the invention is not only low in cost, but also resistant in throwing, and is applicable for a dynamic compactor with low ramming power.

The invention relates to a composite high-refractive spectacle lens. The composite high-refractive spectacle lens consists of a graphene fiber clad layer, a PMMA soft film layer, a chemical reinforcedaluminosilicate glass layer, a PMMA soft film layer, a zirconium dioxide clad layer, a titanium dioxide clad layer, a graphene fiber clad layer and an anti-fouling film which are arranged from insideto outside in sequence; the thickness of the PMMA soft film layer is 1/8 to 1/10 of the thickness of the chemical reinforced aluminosilicate glass layer; the thicknesses of the graphene fiber clad layer, the zirconium dioxide clad layer and the titanium dioxide clad layer are smaller than 50 nm respectively; and the thickness of the anti-fouling film is smaller than 0.5 microns. The spectacle lens takes glass with high pressure resistance and high strength as a substrate, the thickness of the lens can be greatly reduced under the premise of reaching same refractive index effect, and the disadvantage that the glass lens is fragile is overcome through the combination of the soft film layer and the graphene fiber layer, so that the spectacle lens has the advantages of resin lens and glass lens.