65results about How to "Low expansibility" patented technology

The invention relates to an aluminum-base composite material, particularly a novel particle-reinforced aluminum-base composite material and a preparation method thereof. The preparation method comprises the following steps: adding micro/nano MgO and one or more of SiO2, TiO2 and ZrO2 into a pure aluminum or aluminum alloy base, and carrying out melt direct reaction to prepare the Al2O3/MgO.Al2O3 (magnesia alumina spinel) hybrid oxide particle-reinforced aluminum-base composite material. The Al2O3 particle size is on the nano level, and the magnesia alumina spinel particle size is on the micro/nano level, thereby implementing multi-scale hybrid oxide particle reinforcement. The particle volume percent is calculated according to the stoichiometric formula, and the proper particle total volume percent is 2-4 vol.%. The prepared composite material has the characteristics of low cost, high strength, high wear resistance, low thermal expansivity and low residual stress, and is a novel aluminum-base composite material system.

The invention discloses a urethane acrylate grouting material capable of repeatedly re-expanding when meeting water and a preparation method thereof. The preparation method comprises the following steps of: using diisocyanate and hydrophilic polyether binary alcohol or trihydric alcohol as polyalcohol raw materials to synthesize a polyurethane pre-polymer; performing a reaction on the polyurethane pre-polymer and an alkenyl compound with active hydrogen for end capping; and adding water, an accelerator, cross-linking agents and the like to prepare a component A of a double-component urethane acrylate grouting material capable of re-expanding when meeting water, wherein a component B matched with the component A consists of initiator aqueous solution. In order to further enhance the water meeting expandability of a system, other hydrophilic co-monomers can also be added into the component A. The prepared composite grouting material has certain elasticity and water meeting expandability, the water meeting free swelling ratio which can be adjusted to between 100 percent and 400 percent, a repeated water absorption expansion effect and fewer influences caused by the ion concentration and the pH value, and can solve the problems of repeated leakages in water blocking and preventing projects under various conditions.

The present invention provides a raw material composition for preparing a sintered body of aluminum titanate, the composition comprising (i) 100 parts by weight of a mixture comprising 40 to 50 mol % of TiO₂ and 60 to 50 mol % of Al₂O₃, (ii) 1 to 10 parts by weight of an alkali feldspar represented by the formula: (Na_xK_1−x)AlSi₃O₈ (0≦x≦1), and (iii) 1 to 10 parts by weight of at least one Mg-containing component selected from the group consisting of a Mg-containing oxide with spinel structure, MgCO₃ and MgO, and a process for preparing a sintered body of aluminum titanate comprising sintering a formed product prepared from the raw material composition at 1300 to 1700° C. According to the present invention, a sintered body of aluminum titanate having high mechanical strength and ability to be stably used at high temperatures, as well as its inherent properties of low coefficient of thermal expansion and high corrosion resistance, can be obtained.

The invention is a palmityl trimethyl ammonium bromide expansive soil modifier, characterized in comprising the preparing steps of: (1) at room temperature, preparing saturated lime water solution; (2) weighing the needed palmityl trimethyl ammonium bromide in the mass ratio of palmityl trimethyl ammonium bromide to dry soil = 0.5 : 99.5; (3) dissolving the palmityl trimethyl ammonium bromide in the saturated lime water solution, where it needs to notice that the dosage of the saturated lime water solution is able to completely dissolve the palmityl trimethyl ammonium bromide. And the advantages: making the soil property still able to reach the specified standard under the water influence; improving engineering property of expansive soil; unable to cause environmental pollution. And its construction method uses osmotic modification principle and fully uses multi-crack property of expansive soil and is simple and convenient.

The invention relates, inter alia, to a piezoelectric component (10) in the form of a multilayer structure, wherein a piezoelectric ceramic layer (11) and an electrode layer (12, 13) are always alternatingly superimposed to form a stack (18), wherein each electrode layer (12, 13) extends at least in certain areas to at least one side surface (19) of the stack (18). In order to protect the component (10) against short circuits and flashovers, a passivation (20) is provided on the at least one side surface (19). In order to ensure that bonding of said passivation (20) on the surface (19) of the component (10) always remains unaltered, especially when cracks emerge in the ceramic layers (11), the passivation (20) is formed by a passivation material having a tearing strength that is smaller than the bonding strength of the passivation material on the surface (19) of the component (10). The invention also relates to advantageous passivation materials, wherein said materials can be, for instance, a polyurethane, a fluorine-silicone rubber and the like.

The invention provides a modified polyol and a preparation method thereof, and a modified polyurethane material and preparation method and application thereof. The modified polyol includes a polyol matrix and micro-nano lignocellulose dispersed in the polyol matrix; the polyol matrix is selected from polyester polyol and/or polyester polyol. Micro-nano cellulose contained in the micro-nano lignocellulose provided herein has a large amount of hydroxyl radicals which may form binding sites with the polyol matrix; therefore, the micro-nano lignocellulose can be well dispersed in the polyol matrix, and the polyurethane material prepared with the polyol as a matrix is enhanced and toughened.

The invention relates to a software testing data analysis device and method which are mainly applied to software white-box testing, in particular to a software testing data analysis oscilloscope and method. The software testing data analysis oscilloscope comprises a code running monitoring device, a testing information transmission device, a running state analysis device and a running state display device. As a result, the software testing data analysis oscilloscope has the advantages that the software running state is displayed in the form of a waveform, and the real-time running state of software can be reflected; instrumentation operation is conducted through different probe implantation units, so each action in the execution process of the software can be monitored, and clearer and more accurate data support is provided for testing personnel; instrumentation is only conducted on a limited number of program structures, so that the expansibility of programs is reduced, and efficiency is improved.

The invention discloses a laser additive manufacturing method of an iron nickel-manganese copper dissimilar material metal part. The method comprises the following steps that firstly, an iron-nickel alloy is deposited on a substrate by adopting a laser additive manufacturing method; secondly, mixed powder composed of iron-nickel alloy powder with the iron-nickel alloy powder mass content larger than 70% or smaller than 50% and manganese-copper alloy powder serves as a raw material, and an iron nickel-manganese copper transition area is formed through deposition with the laser additive manufacturing method; and thirdly, manganese-copper alloy is deposited on the iron nickel-manganese copper transition area through the laser additive manufacturing method, the substrate is removed, and the iron nickel-manganese copper dissimilar material metal part is obtained. According to the method, by adjusting the deposition direction and controlling the transition path of the mixed powder, the defects of cracking, undissolved particles and the like of the iron nickel-manganese copper gradient material are overcome, and the obtained iron nickel-manganese copper dissimilar material metal part is compact in structure and small in transition area size, has the damping performance and low expansion performance and is wide in application range.

The invention discloses a Fe-Ni invar alloy welding wire. The Fe-Ni invar alloy welding wire comprises the following chemical components in proportion by weight: 0.04-0.10% of C, not greater than 0.25% of Si, 0.2-0.4% of Mn, not greater than 0.08% of P, not greater than 0.003% of S, 35-38% of Ni, 0.2-0.5% of Cr, 0.08-0.15% of V and the balance Fe and inevitable impurities, wherein the total of theinevitable impurities is less than 0.05wt%. The invention further provides a preparation method for the Fe-Ni invar alloy welding wire. The preparation method comprises the steps of smelting, die casting, rolling, solution treatment and production adopting a cold-drawing process. According to the preparation method disclosed by the invention, the strength and toughness of deposited metal is improved and low expansion performance is ensured through increasing the content of C and appropriately adding the elements of Cr, V and the like, and by virtue of carbide strengthening and solution strengthening; and the Fe-Ni invar alloy welding wire is low in manufacturing cost, excellent in welding process performance and wide in application.

The invention relates to an expansive soil modifying agent, which can reduce the swelling shrinkage, water sensitivity and dispersion of the swelling soil, falling into the technical field of geotechnical engineering. In the application of single-molecule biquaternary ammonium salt in expansive soil modification, the single-molecule biquaternary ammonium salt is composed of a first compound, and/or a second compound, wherein the first compound has the molecular formula of A1A2A3N<+>XnN<+>A4A5A6B<2->; and the second compound has the molecular formula of A1Py<+>XnPy<+>A2B<2->. The expansive soil modifying agent is formed by mixing the single-molecule biquaternary ammonium salt and water with the mass concentration of the single-molecule biquaternary ammonium salt as 0.001-0.5%. The inventive expansive soil modifying agent has good water solubility, convenient construction, and high durability, can effectively solve the swelling-shrinkage deformation problem of the expansive soil, and reduces or eliminates the bad effect of the expansive soil on the project to meet the project requirement.

The invention relates to a preparation method of a siliceous hot repairing material with low cost and low water demand, and belongs to the field of refractory materials. The siliceous hot repairing material is prepared from 30-65 wt% of fused quartz, 15-40 wt% of silica, 10-20 wt% of waste silica bricks, 6-15 wt% of silica micro-powder, 1-6 wt% of a mineralizing agent, 4-10 wt% of a binding agent,1-5 wt% of a sintering aid and 0.1-1 wt% of a superplasticizer. The waste silicon bricks are used as a raw material, so that the material cost is obviously reduced; the construction water demand is 7-11%, so the secondary damage degree to a furnace wall is reduced; the siliceous hot repairing material has a high bonding strength with the silicon bricks, and has small corrosivity, and the siliceous hot repairing material and the silicon bricks have thermal expansion synchronism; and the product provided by the invention has the characteristics of good wear resistance, high softening temperature under load, good thermal shock stability, high wall-climbing rate and the like.

The invention relates to the technical field of building materials, in particular to a material formula of an inorganic fireproof core layer. The material formula of the inorganic fireproof core layer comprises, by weight, 5%-15% of silicon dioxide, 5%-15% of magnesium oxide, 5%-15% of magnesium chloride, 25%-35% of flyash, 15%-25% of saw dust , 5%-10% of carbon fibers, 5%-10% of loess powder and 5%-15% of curing agents. The inorganic fireproof core layer prepared through the material formula is high in fireproof and water resistant capacity, the used materials can realize waste utilization, and the purposes of being green and environmentally friendly are achieved.

The invention provides a steaming-free and baking-free brick and a preparation method thereof, and belongs to the technical field of building materials. According to the method, reduction and recycling of the natural gas water-based drilling solid waste are realized; coal ash is fine ash in smoke generated after coal combustion, a large amount of cement and fine aggregate are saved by doping the coal ash, the water consumption is reduced, the workability of a mixed slurry is improved, the pumpability of the mixed slurry is enhanced, creep of the mixed slurry is reduced, hydration heat and heatenergy expansibility are reduced, and the impermeability of the steaming-free and baking-free brick is improved. The modifiability of the steaming-free and baking-free brick is improved; the cement is used as a cementing material, is powdery, and is mixed with a proper amount of water to form plastic slurry, the slurry can be changed into hard stone-like bodies through a physical and chemical process, the granular material can be cemented into a whole, and the cement can be better hardened in water to maintain and develop the strength; the desulfurized gypsum is used as a sulfate activator, plays a role of an accelerant, and can directly and indirectly enhance the strength of the steaming-free and baking-free brick.

The invention discloses a modified phosphogypsum material used for sea reclamation. The phosphogypsum is modified by raw material selection and proportioning so as to be suitable for sea reclamation. The materials comprise phosphogypsum and fly ash and/or cement, and the fly ash is above the third level and is generated during production of thermal power plants or heating boilers. With fill strength, good water resistance and high compressive strength, the modified phosphogypsum material not only can meet the compressive strength requirements of road building, wharf construction and the like, but also can make heavy use of phosphogypsum, fly ash and other solid waste, thus solving the constraint bottleneck problem of waste residue utilization during sustainable development of the phosphorus chemical industry. The modified phosphogypsum material provided by the invention is suitable for sea reclamation.

The invention relates to a low-pH ultrafine aluminophosphates cement-based grouting material, which is obtained by mixing and stirring raw materials and water. Raw materials of the product contain, by weight, 45-55% of aluminophosphates cement, 25-35% of fly ash, 5-15% of slag, 5% of a dispersant, 0.5-1.0% of a polycarboxylic acid type water-reducer, and 1% of an expanding agent. The pH value of the grouting material is less than or equal to 11. The grouting material of the invention has good fluidity and slight expansibility, has a good sealing effect when used for deep geological disposal of high-level waste, has good stability when in use, and has high fluidity, high groutability and high endurance. After slurry is hardened, anti-seismic property is excellent.

The invention relates to the field of environmental geotechnical engineering, in particular to a microbial ecological modification method for expansive soil. The method comprises the following steps: respectively obtaining to-be-modified expansive soil and a sporosarcina pasteurii bacterial solution; mixing urea and calcium salt to obtain a cementing liquid; mixing the sporosarcina pasteurii bacterial liquid and the cementing liquid according to a preset volume ratio, and then adding the mixture into to-be-modified expansive soil for mixing to obtain a sample; maintaining the sample to obtain the green and environment-friendly modified expansive soil. By adopting sporosarcina pasteurii, urea can be continuously hydrolyzed into NH4 < + > and CO3 < 2->, meanwhile, Ca < 2 + > in expansive soil and added CaCl2 is continuously attracted to the surfaces of thalli, and Ca < 2 + > and CO3 < 2-> are combined on the surfaces of the thalli to form calcium carbonate crystals, so that the soil body strength of the expansive soil is enhanced; meanwhile, residual NH4 < + > and Ca < 2 + > in the reaction system can reduce the expansibility of the expansive soil through the effects of neutralizing negative charges and replacing cations respectively.

An electric treating method for getting over the continuous cropping obstructions of soil, such as infectious diseases and pests, the harmful substances including organic acid and high pH value, features that two electrodes connected to the positive and negative ends of power supply respectively are parallelly and oppositely buried in the soil whose water content is 5-40% and a voltages is applied across them for electrolyzing the soil. Its apparatus features that the positive end of the second winding of a transformer is connected via diode to one electrode and its negative end is directly connected to another electrode.

The invention relates to an invar alloy for large scale integrated circuit manufacturing equipment and a preparation method of the invar alloy. The technical scheme adopted by the invention is that an existing conventional Fe-Ni invar alloy comprises Ni, Fe and allowable impurities, wherein the allowable impurities comprise C, the mass fraction of Ni is 34.0%-38.0%, the mass fraction of C is 0.001%-0.1%, and the balance is Fe; the invar alloy for large scale integrated circuit manufacturing equipment is characterized in that Ti is added on the basis of keeping the constituents of the conventional Fe-Ni invar alloy, and the mass fraction of Ti is 0.01%-0.5%; Ti reacts with C to generate a strengthening phase TiC in situ. The invar alloy and the preparation method solve the problems that the conventional Fe-Ni invar alloy is relatively low in tensile strength, and cannot meet the production and use requirements of the large scale integrated circuit manufacturing equipment.

The invention provides a method of adjusting the expanding property of black cotton soil. The method comprises the following steps: preprocessing black cotton soil to obtain a black cotton soil sample, wherein the pretreatment comprises an acidification treatment and a sodium pillaring treatment; subjecting silane to hydrolysis to obtain a silane hydrolysis solution; and using the silane hydrolysis solution to carry out silane grafting on preprocessed black cotton soil to obtain a silane grafted black cotton soil sample. According to the provided method, black cotton soil is subjected to an acidification or sodium modification pretreatment to obtain black cotton soil with certain activity; then the black cotton soil is grafted by silane with different concentrations, silane and hydroxyl groups in the black cotton soil carry out condensation reactions, the hydrophilic property of black cotton soil is converted into hydrophobic property, and the water absorbing expanding property of black cotton soil is changed.