119results about How to "Not easy to segregate" patented technology

The invention discloses a shield synchronous grouting construction material including, by weight, 200-300 parts of composite Portland cement, 400-600 parts of fly ash, 50-80 parts of 200-mesh calcium based bentonite, 1200-1300 parts of grading river sand, 0.4-0.6 parts of hydroxypropylmethyl cellulose, 0.5-3 parts of a water reducer, 0.3-1 part of a retarder, 1-3 parts of an early strength agent and 16-24 parts of a volume stabilizing agent. Through reasonable adjustment of composition and content of the components, the compressive strength, bleeding ratio, setting time and flowability of the construction material are controlled, so that the construction material has long initial setting time, is quick in early strength development, is not liable to dissociation, has good volume stability, can effectively fill in gaps in buildings and prevent floatation and deformation of tunnel segments, has good flowability and anti-dispersing property, and is easy to transport and to store for a long period.

The invention discloses an ecological dustproof type seawater sea-sand anti-corrosion marine concrete and a preparation method thereof. The concrete comprises the following raw materials: cement, silica fume, coal ash beads, blast furnace slag powder, corroding ion inhibitors, sea sand, steel fibers, a water reducing agent and seawater. The preparation method comprises the following steps: mixingcement, silica fume, coal ash beads, blast furnace slag powder, corroding ion inhibitors and steel fibers and then uniformly stirring with a stirrer; adding sea sand and continuing to uniformly stir;adding seawater and the water reducing agent; mechanically stirring till uniformly stirring, thereby acquiring a concrete slurry; pouring and then removing a mold and maintaining for 48h at 80 DEG C under the condition of humidity of 95%, thereby acquiring the marine concrete. The concrete disclosed by the invention has the advantages of high curing rate of chloride ions, excellent working performances, high durability, lower cost, locally acquired raw materials, short construction period and suitability for popularization and application.

The invention discloses a petrol pump motor oil bearing manufacturing method based on powder metallurgy. The method comprises the steps of powder mixing, low-temperature diffusion, press molding, sintering, finishing and surface beating, and oil-impregnated treatment. In the powder mixing process, 70%-85% of Sn powder, 5%-10% of composite graphite powder and the balance copper powder are mixed by weight. In the low-temperature diffusion process, evenly mixed powder is subjected to low-temperature diffusion in a diffusion furnace under the protection of nitrogen. In the press molding process, powder subjected to low-temperature diffusion is placed in a die for press molding and pressed into a pressed blank. In the sintering process, the pressed blank is sintered into an alloy sintered body in the N and H reducing atmosphere. In the finishing and surface beating process, the alloy sintered body is pressed and shaped with a molding die. In the oil-impregnated treatment process, the pressed part is placed in a vacuum oil impregnation machine for oil-impregnated treatment. According to the method, the copper-coated graphite powder is added to serve as the solid lubricant to enable Cu-Sn alloy to be combined more easily at a low temperature; furthermore, graphite is evenly mixed and not prone to segregation.

The invention provides a regenerated sand powder green concrete. The regenerated sand powder green concrete comprises, by mass, 10 to 93% of regenerated sand powder, 5 to 83% of a regenerated composite admixture, 0 to 20% of Portland cement, 0 to 5% of an alkali-activator, and 1 to 2% of an additive; a coarse aggregate free lightweight concrete with a density smaller than 1900kg/m<3> is prepared from regenerated sand powder and regenerated composite admixture at a double component doping amount of 70% or larger. The invention also discloses a preparation method of the regenerated sand powder green concrete. According to the preparation method, waste concrete cement stone flour and brick-concrete regenerated sand powder are subjected to mixing grinding so as to obtain the regenerated composite admixture which is a multi-component composite gelling material and possesses composite gelling and superimposed effect. The regenerated sand powder green concrete possesses the filling effect andmicro-aggregate effect of regenerated sand powder, and the gelling performance of the regenerated composite admixture, the double component doping amount is higher than 70%, so that regenerated material large amount doping is realized, and it is beneficial for promotion of building waste resource utilization and green development of concrete industry.

The present invention relates to high-viscosity asphalt. The high-viscosity asphalt is composed of the following raw materials in percentages by weight: 3-8% of a styrene-butadiene-styrene block copolymer (SBS), 1-3% of styrene-butadiene rubber (SBR), 2-10% of a compatibilizer, 0.08-0.3% of a stabilizer, 0.5-2% of sodium dodecyl sulfate, 0.8%-1.5% of polyphosphoric acid (PPA) and the balance of matrix asphalt. At the same time, the present invention also discloses a preparation method of the high-viscosity asphalt. The high-viscosity asphalt provided by the present invention has excellent performance, can satisfy high-viscosity and high-elastic properties, can satisfy simplification of production and construction, and has low costs.

The invention discloses a high speed steel precursor powder mixture used for preparing a cBN-high speed steel composite material. The high speed steel precursor powder mixture comprises, by mass, 3%-15% of Co powder, 32%-75% of Fe powder, 20%-50% of carbide powder selected from Group 4 metal, Group 5 metal and Group 6 metal of the periodic table of the elements, and 0-2% of C powder. The cBN-high speed steel composite material comprises, by mass, 1%-30% of cBN, 2.7%-13.5% of Co, 1.7%-5.4% of C, 14%-45% of Group 4 metal, Group 5 metal and Group 6 metal selected from the periodic table of the elements, and 40.6%-67.5% of Fe. Non-atomized powder is adopted to replace atomized powder, a local eutectic liquid phase can be avoided, erosion to cBN by the local eutectic liquid phase is prevented, the cBN can be kept stable, and therefore usability of the final cBN-high speed steel composite material is improved.

The invention discloses a preparation method of an in-situ synthesized aluminum-based composite bar. The preparation method comprises the steps of preparing TiB2 reinforced aluminum-based composite billet by adopting a mixed salts method; installing and welding the aluminum-based composite billet to form a consumable electrode with the cross section of Phi 150-500mm; then, smelting to obtain a vacuum consumable ingot of Phi 200-600mm; feeding the vacuum consumable ingot into a resistance furnace, heating, preserving the heat, and forging the vacuum consumable ingot to obtain the aluminum-based composite bar with the cross section of Phi 150-500mm. Through microscopic and macroscopic metallographic inspection, the aluminum-based composite bar prepared by using the preparation method is very uniform in TiB2 reinforced phase distribution and very compact in tissue; and through ultrasonic inspection, the bar has no inclusion defect and has the tensile strength of 415MPa and the rupture elongation of 2.5%.

The invention discloses a container with an inner heating casing. A heating pipe consists of an inner casing and an outer casing which are coaxially sheathed, wherein heat conducting medium fills between the inner casing and the outer casing. Therefore, when the inner casing is heated, heat of the inner casing is transferred to the outer casing through the heat conducting medium layer, and then the outer casing transfers the heat to modified asphalt which is in direct contact with the outer casing; since the specific heat capacity of the heat conducting medium layer is higher and the temperature rise speed is lower than that of the outer casing, the temperature of the outer casing can be more easily controlled by controlling the temperature of the heat conducting medium layer; since the heat conducting medium layer is arranged and the temperature of the outer casing is stable, the temperature of the modified asphalt in a tank body can be stably controlled within a temperature interval in which the modified asphalt is not easily segregated, the fluidity is good and the asphalt is not solidified, the technical problems that the modified asphalt is segregated and decomposed at high temperature and is easily solidified at low temperature and the modified asphalt close to the heating pipe is easily aged are avoided, and the quality of the modified asphalt is guaranteed.

The invention belongs to the field of die steel materials, and particularly relates to a making method for an aluminum oxide-silicon carbide crystal whisker reinforced cold work die steel material. Aluminum oxide-silicon carbide crystal whisker reaction precursor powder is blown into WCrMoV melt in a vacuum melting furnace through nitrogen and carbon dioxide; during a blowing process, self-propagating combustion synthesis reaction is caused, so that nanometer aluminum oxide-silicon carbide crystal whiskers and a small amount of carbon and silicon are obtained; and then the aluminum oxide-silicon carbide crystal whisker reinforced cold work die steel material is obtained through mechanization mixing and blending, modification treating, refining and pouring. The reinforcing nanometer crystal whiskers are small in diameter size, uniform in distribution and high in texture stability, is contamination-free on the surface, and is well combined with the WCrMoV substrate. The room-temperature mechanical property and wear-resisting property of the material are obviously improved; and the material is especially suitable to application of cold work die alloy steel, drill bits, cutters and the like.

The invention relates to the technical field of building materials, in particular to super-retarding concrete. The formula comprises the following raw materials in parts by weight: 210-250 parts of cement, 30-50 parts of an admixture, 3-5 parts of basalt fiber, 8-10 parts of an additive, 805-810 parts of river sand, 985-1010 parts of stone and 165-170 parts of water. The additive comprises a waterreducing agent, a retarder, a water retaining agent and a defoaming agent, the weight ratio of the water reducing agent to the retarder to the water retaining agent to the defoaming agent is (6-8): (7-9): (3-5): (1-2), the admixture comprises phosphorus slag, coal ash and microbeads, and the weight ratio of the phosphorus slag to the coal ash to the hollow glass microbeads is (10-20) :(40-50) :(10-15). The super-retarding concrete with higher strength and longer setting time is obtained by reasonably proportioning the cement, the admixture, the basalt fibers, the additive, the river sand, thestone and the water and matching the raw materials, pumping construction can be carried out, segregation and layering are not likely to happen, and the super-retarding concrete has important significance on development of the concrete industry.

The invention discloses a rubber powder modified asphalt with high fatigue resistance and cracking resistance and a preparation method of the rubber powder modified asphalt. Firstly, nano-crystallinecellulose is grafted with an epoxy group, and then nano-crystalline cellulose is subjected to a reaction with white carbon black, and modified white carbon black is obtained; the surface of waste rubber powder is grafted with polystyrene, the waste rubber powder is modified with polyphenyl ether and hydrogenated styrene-ethylene-styrene terpolymer particles, and modified rubber powder is obtained;glass fibers are modified with a silane coupling agent, the modified glass fibers, the modified rubber powder and limestone are mixed into matrix asphalt, the modified rubber powder, the modified glass fibers and groups in asphalt raw materials are reacted mutually, a dense and stable network structure is formed, pores of an asphalt mixture are filled with the limestone, and the rubber powder modified asphalt is prepared. The principle is simple, reaction conditions are mild, waste rubber tire resources are utilized reasonably, environmental pressure is relieved, and the prepared asphalt mixture has good overall performance, is cheap and is quite practical.

The invention discloses a preparation method for ceramic fiber composite crumb rubber modified asphalt, and belongs to the technical field of modified asphalt. According to the method, barium acetate and tetrabutyl titanate are mixed to prepare a ceramic fiber, the ceramic fiber and a waste tyre are milled to prepare mixed crumb rubber, the crumb rubber is coupled to be mixed in a high-speed shear apparatus to prepare the modified asphalt, and by the coupling effect, the asphalt is connected with the crumb rubber more closely, the strength of the asphalt is strengthened and the performance of the asphalt is improved. The preparation method has the benefits that the preparation method is simple, and in a preparation process, the ceramic fiber, the crumb rubber and the asphalt are high in compatibility and dispersibility, unlikely to be separated and easy to load, unload and transport; the modified asphalt is easy to heat, high in stability and unlikely to be influenced by low temperature and high temperature.

The present invention relates to a fly-ash ceramsite concrete, which is characterized by that its composition comprises (by weight portion) 25-33 portions of fly-ash ceramsite, 17-26 portions of cementing material, 42-51 portions of light fine aggregate, and air-guiding agent whose content is 1X10 to the minus fourth % and high-effective water-reducing agent whose content is 0.6% of cementing material and water. It can improve workability of new-stirred concrete, its strength can be up to 45 Mpa, and its durability and after-strength are also can be raised.

The invention discloses a high-workability high-toughness concrete and a preparation method thereof, belonging to the technical field of construction materials. The invention aims to solve the problems of low toughness and poor workability in the existing ultrahigh-performance concrete. The high-workability high-toughness concrete is prepared from cement, high-strength fibers, a nano material, medium sand, an additive and water according a certain proportion at normal temperature. A calcium silicate hydrate gel solution water reducing agent introduced as the additive effectively increases the early strength of the high-workability high-toughness concrete, enhances the binding degree between the fibers and mortar matrix and enhances the binding effects, thereby effectively enhancing the concrete ductility. Besides, the high-toughness concrete has the characteristics of lower nano material doping amount and low water consumption, thereby being beneficial to enhancing the concrete strength. The additive has the advantages of controllable doping amount and favorable adaptability to the nano material, so the concrete has the advantages of low viscosity, low isolation tendency, favorable flowability, favorable stability and favorable plasticity.

The invention discloses a method for preparing copper-tungsten alloy from superfine tungsten powder. The method comprises the following steps of S1, tungsten powder pretreatment: ball milling, powder preparation through atomization, and alkali/acid pickling; S2, superfine tungsten powder surface copper coating: primary electroplating and secondary electroplating; S3, copper-coated tungsten powder reduction; S4, preforming and S5, vacuum hot pressed sintering. Compared with the copper-tungsten alloy prepared by other methods, the copper-tungsten alloy prepared by the preparation method has higher hardness, higher strength, higher wear resistance and higher arc ablation resistance, and the ultrafine-grained tungsten powder is used for coating, so that the coated particles are more stable and not easy to segregate, and the coating rate is higher, so that the uniformity of the product is ensured, and the service life of the copper-tungsten alloy is prolonged.

The invention relates to quick-freezing edible oil. The quick-freezing edible oil comprises the following raw material components in parts by weight: 45-75 parts of lard oil, 15-30 parts of palm oil, 15-25 parts of water, 0.1-0.3 part of monoglyceride and 0.1-0.3 part of lecithin. The quick-freezing edible oil has the advantages of moderate grease hardness and good taste.