83results about How to "Meet different performance requirements" patented technology

The invention relates to a gypsum-cement binding material and a production method thereof. The material contains gypsum binding material, active admixture, alkaline excitant, oagulation accelerator, lime, water-reducing agent, early-strength agent and gypsum hemihydrate. The weight proportions of the components are as follows: 40%-80% of gypsum binding material, 10%-45% of active admixture, 4%-15% of alkaline excitant, 0-6% of coagulation accelerator, 0-1% of early-strength agent, 0-1% of water-reducing agent, 0-5% of lime and 0-10% of gypsum hemihydrate. The production method comprises the following steps: weighing raw materials at the given ratio, mixing all raw materials, and packaging. The inventive gypsum-cement material has high strength, good water resistance and good volume stability; and can be used as masonry cement, cement mortar, gypsum plaster, jointing gypsum and heat-insulating mortar.

The invention provides a screw rotor end face profile pair and a construction method thereof. The screw rotor end face profile pair comprises a pair of conjugated male rotor profile and female rotor profile, wherein each tooth profile in the male rotor profile and the female rotor profile is formed by six curves in a smooth connection mode; segmented curves of the male and female rotors are first-order continuous, rotor profiles formed by the segmented curves and envelope curves of the segmented curves are not interfered each other; and each curve comprises four segments of elliptical arcs, two segments of arcs and envelope curves of the arcs. According to the invention, tooth crests of driven edges of the male and female rotors are in an elliptical arc transition, and the tooth root and the tooth crest of a driving edge of the male rotor are in an elliptical arc transition, so that the construction of the profile is flexible, the machinable performance of the rotor can be improved, more importantly, the torque generated by the gas pressure on the driven edge of the female rotor can be adjusted, thus the smooth mesh of the rotors can be ensured; no pin tooth arcs are used, thus the meshing stability can be improved; the adjustable construction parameters are more, thus different performance requirements can be satisfied; the combination of the rotor tooth profile pair is diversified, thus the tooth profile pair can be applied to different occasions.

The invention discloses a light high-alumina insulating firebrick and a preparation method thereof used for insulating layers of thermal equipment. The firebrick comprises the raw materials in percent by weight: 40% to 60% of high-alumina bauxite clinker and 40% to 60% of binder, polymeric light ball and sawdust respectively account 0.5% to 1.5% and10% to 15% of the total weight of the high-alumina bauxite clinker and the binder and are also added. The preparation method comprises the steps of: mixing the high-alumina bauxite clinker with the binder; then adding the polymeric light ball and the sawdust; adding water with the proportion of the dry mixed powder and the water of 1.0 to 1.75: 1; stirring into slurry-shaped materials; casting into brick blanks; drying; filling into a kiln; heating to 1270 DEG C to 1350 DEG C; and keeping the temperature for preparing the firebrick by burning. The firebrick has the advantages of simple formulation, easy acquirement of the raw materials, good compatibility, high compressive strength, low thermal conductivity, low change rate of high-temperature heavy firing line and the like, and achieves the national standards of relative products. The firebrick has simple preparation method and lower cost, can be used for the insulating layers and fireproof layers of all kinds of thermal equipment, and is beneficial to popularization and application.

The present invention discloses a manufacturing method of tarpaulin with high strength and direct coating knife scraping, and the method is performed as per the following steps: (1)a composition with a certain weight including PVC paste resin, plasticizer, stabilizer, filling, fire resistant agent and painting is mixed to form coating agent; (2)the mixed coating agent is grinded and filtrated; (3)1-5kg cross-linking agent is added into each 100kg coating agent, and are evenly coated on a base cloth, and drying is executed; (4)after plasticizing and forming, surface treatment agent is used for treating. The tarpaulin manufactured with the method in the present invention has the advantages of waterproof, oil resistance, dirt resistance, fireproof, aging resistance, stripping resistance, etc., which can be used for carriage tarpaulin, carriage side curtain cloth and cloth for a container with the top opened; train tarpaulin and ship tarpaulin; building material, applied for building material for soft roof, such as a supermarket, a stadium and a sightseeing building; for military use, for temporary rest of the field army, headquarters during wartime, etc.

The invention relates to a high-strength and high-aluminum light heat-insulation and fire-resistant brick, which is used in a heat-insulation layer in thermal equipment, and a production method thereof. The fire-resistant brick includes following basic raw materials: 30-35% of a high-aluminum alumina clinker, 10-20% of an expansion agent and 45-55% of a bonding agent and additionally includes 0.1-0.15% of engineering fibers and 0.15-0.2% of a water reducer on the basis of the total amount of the basic raw materials above. In addition, each ton of the basic raw materials is added with 0.7-2.0 m<3> of expandable polystyrene spheres. The bonding agent is kaolin or high-aluminum alumina cement and is 200-320 meshes in granularity. The production method includes the steps of stirring the raw materials to form a sludge material, preparing the sludge material into green bricks, drying the green bricks, and sintering the green bricks at 1350-1400 DEG C with heat insulation. The fire-resistant brick is high in pressure resistance strength, is low in heat conductivity and is low in change rate of a high temperature reburning curve. The normal-temperature pressure resistance strength of the fire-resistant brick is higher than that of a common fire-resistant brick by more than two times. The fire-resistant brick can be used in a heat insulation layer and a fireproof layer in all thermal equipment, achieves both energy-saving and fireproofing effects and is beneficial to popularization.

The invention relates to a large-swelling-amount welded tube and a manufacturing method thereof, belonging to the technical field of welded tube steel. The welded tube contains the following chemical components in percentage by mass: 0.02-0.10wt% of C, 2.0-6.0wt% of Mn, 0.2-1.0wt% of Si, less than 0.01wt% of S, less than 0.02wt% of P and the balance of Fe and inevitable impurities, and can also contain the following one or more chemical components: 0.1-0.6wt% of Ni, 0.1-0.6wt% of Cr, 0.1-0.5wt% of Cu, 0.01-0.1wt% of Nb, 0.01-0.1wt% of V and 0.01-0.02wt% of Ti. The manufacturing method comprises the following steps: performing converter steel making, controlled rolling and controlled cooling; then performing crimping plate processing on steel strips; forming a swollen blank tube through high frequency welding (HFW); and finally performing heat treatment to obtain residual austenite of which the volume fraction is larger than 5% in the structure. The invention ensures that the material has high strength level and simultaneously has high plasticity, the uniform elongation rate is up to 20% or above, and all the mechanical performance indices meet the requirements of API and other relevant standards.

The invention discloses a high-coercivity samarium-cobalt permanent magnet material and a preparation method thereof. The high-coercivity samarium-cobalt permanent magnet material comprises a main alloy and an auxiliary alloy, wherein a chemical formula of the main alloy is Sm<x>Co<y>Fe<z>Cu<w>Zr<bal>; x is smaller than or equal to 27% and greater than or equal to 24%; y is smaller than or equal to 55% and greater than or equal to 45%; z is smaller than or equal to 20% and greater than or equal to 15%; w is smaller than or equal to 10% and greater than or equal to 4%; the chemical formula of the auxiliary alloy is NMFe<c>; N represents one or a mixture of light rare earth elements Sm, Pr and Nd; M is one or the mixture of heavy rare earth elements Dy and Tb; a is smaller than or equal to 25% and greater than or equal to 20%; b is smaller than or equal to 65% and greater than or equal to 60%; c is smaller than or equal to 20% and greater than or equal to 15%; and meanwhile, Dy<2>O<3> powder which is equivalent to 0.1%-0.5% of the weight of the main alloy is added. According to the high-coercivity samarium-cobalt permanent magnet material, growth of crystal particles in a sintering process can be prevented; the crystal particles of a samarium-cobalt alloy are refined; and improvement of the coercivity is facilitated; and continuously adjustable coercivity can be achieved by proportioning the main alloy and the auxiliary alloy with different ratios.