763results about How to "Enhanced resistance to peeling" patented technology

Metal alkyl borohydrides are used as initiators of polymerisation, particularly in adhesive compositions for bonding a wide range of substrates including low surface energy substrates such as polyolefins. As described, the metal alkyl borohydrides are of the formula I or II.

wherein

• • R¹ is C₁-C₁₀ alkyl,
  • R² and R³, which may be the same or different, are H, D, C₁-C₁₀ alkyl or C₃-C₁₀ cycloalkyl, phenyl, or phenyl-substituted C₁-C₁₀ alkyl or C₃-C₁₀ cycloalkyl, provided that any two of R¹-R³ may optionally be part of a carbocyclic ring, and
  • M⁺ is a metal ion.

In particular, alkali metal trialkyl borohydrides are used, the alkali metal salt being selected from: Lithium triethylborohydride, Sodium triethylborohydride, Potassium triethylborohydride, Lithium tri-sec-butylborohydride, Sodium tri-sec-butylborohydride, Potassium tri-sec-butylborohydride, and Lithium triethylborodeuteride. Other exemplified compounds which are less effective on low surface energy substrates include Lithium 9-borabicyclo [3.3.1]-nonane (9BBN) hydride, Lithium thexylborohydride, Lithium trisiamylborohydride and Potassium trisiamylborohydride.

The invention relates to a composite bonding wear-resistant castable refractory, which can be used for high-temperature kiln engineering. The amorphous castable refractory which is normal in coagulation, quick in hardening, low in porosity, high in strength and high in abrasive resistance is prepared from silica sol serving as a bonding agent, aluminate cement serving as a curing agent, alumina micro powder and wollastonite which serve as a compact agent, heat resistant steel filters serving as a reinforcing agent and corundum and alumina which serve as an aggregate. The composite bonding wear-resistant castable refractory is suitable for positions such as air pipeline elbows for the cogeneration of cement kilns, cyclone cones and linings for triple air pipe gates which are easy to wear in high-temperature kilns.

The invention relates to a low-carbon corundum spinelle brick for refined steel ladles and a preparation method thereof for overcoming the defect of overhigh carbon content in the prior carbon-contained fireproof material technology. The low-carbon corundum spinelle brick for refined steel ladles comprises the following components in percentage by weight: 60-70 fused corundum particles, 2-6 fused magnesite particles, 10-20 fused corundum fine powder, 2-10 fused magnesite fine powder, 5-15 fused spinelle fine powder, 3-6 alpha-Al2O3 micro powder, 0-2.0 metal aluminum fine powder, 0-2.0 metal silicon fine powder, 2-6 bond, 1-2 superfine graphite and 2-6 titanium white powder. The invention has good thermal stability at high temperature, resists high temperature and the erosion of molten steel and slag and has high mechanical strength, good thermal shock stability and high under-load softening point, thereby being widely applied to various steel ladles, in particular to steel ladles of refined low-carbon steel and ultra-low-carbon steel.

The invention provides a laminated body (1) having a good workability during the production and an excellent peeling resistance, which is formed by joining a resin film layer (D) (2) comprising at least a layer composed of a resin composition (C) in which a soft resin (B) having a Young's modulus at 23° C. lower than that of a thermoplastic resin (A) is dispersed in a matrix made from the thermoplastic resin (A) and a rubbery elastomer layer (E) (3) through an adhesive layer (F) (4), wherein an adhesive composition (I) formed by compounding not less than 0.1 part by mass of at least one of a maleimide derivative (H) having not less than two reaction sites in a molecule thereof and poly-p-dinitrosobenzene based on 100 parts by mass of a rubber component (G) is applied to the adhesive layer (F) (4).

The invention relates to a preparation method for a deicing, antiskid and denoising asphalt pavement material. The method is characterized by comprising the following steps: 1) preparation of rubber modified asphalt with high viscosity and high elasticity; 2) preparation of an organic/inorganic ice inhibiting material; 3) selection of mineral aggregate gradation; 4) preparation of the deicing, antiskid and denoising asphalt pavement material, which is realized by preparing mineral aggregate, the rubber modified asphalt with high viscosity and high elasticity, the organic/inorganic ice inhibiting material and fibers according to a mass ratio of 100: 4.8-5.1: 1.05-2.1: 0.225-0.533, heating the rubber modified asphalt with high viscosity and high elasticity at a temperature of 165 to 175 DEGC, and mixing and stirring the mineral aggregate, the rubber modified asphalt with high viscosity and high elasticity, the organic/inorganic ice inhibiting material and the fibers at a temperature of180 to 190 DEG C for 60 to 90 s, with paving temperature being 165 to 180 DEG C, so as to obtain the deicing, antiskid and denoising asphalt pavement material. The asphalt pavement material prepared by using the method has the characteristics of ice removal, skid resistance and noise reduction.

The present invention relates to a kind of high crystal structure cordierite-mullite kiln furniture, kiln furnace refractory product and roasting process. Its raw material includes (by weight portion) 50-80 portions of main crystal phase material and 20-50 portions of combined compound matrix material, in the above-mentioned raw material a proper quantity of crystal nucleus formation agent can be added. Its roasting process includes two stages of high-temperature constant-temperature microcrystallization nucleation intensification treatment. Said invention also provides the concrete steps of every stage.

The invention discloses a manufacturing method for a high-vanadium high-speed steel composite roll suitable for a narrow strip rolling mill. The manufacturing method comprises the steps that an outer layer of a roll body is poured by adopting a centrifugal pouring method, and after the outer layer of the roll body is poured with high-vanadium high-speed liquid steel, inert gas is continuously pumped into a cavity of the outer layer of the roll body; a centrifuge stops rotating when the outer layer temperature of high-vanadium high-speed steel reaches 1220-1280 DEG C, the inert gas is stopped being blown in, and then liquid iron in the core of the roll body is poured through mould closing. According to the manufacturing method for the high-vanadium high-speed steel composite roll, the bonding rate of the high-vanadium high-speed steel of the outer layer and the liquid iron in the core is significantly improved, the binding rate is improved from 40 percent to 100 percent, the bonding strength is improved from about 350 Mpa in the past to about 450 Mpa, and therefore the anti-stripping performance of a roll body bonding layer of the high-vanadium high-speed steel roll is greatly improved; meanwhile, the element amount formed by carbide on the corrosion outer layer of the liquid iron of the core is removed, therefore, roll neck tissues are improved, the tensile strength of the roll neck is improved, and the roll breakage phenomenon in use is effectively and completely eradicated.

The invention relates to a high-performance magnesium-aluminum-chromium composite spinel brick for RH refining furnace dip pipes and non-ferrous smelting furnaces. The high-performance magnesium-aluminum-chromium composite spinel brick is characterized by comprising the following raw materials: 14.0-20.0 parts of low-chromium fused magnesium chromium sand (6-8% of Cr2O3, at least 78% of MgO), 71.6-82.0 parts of high-purity fused magnesite, 2.0-4.4 parts of nano Cr2O3 powder, 2.0-4.0 parts of uf-Al2O3 micropowder and 2-4 parts of binder. The manufacturing method comprises the following steps: mixing, molding, drying, firing and the like. The magnesium-aluminum-chromium composite spinel brick provided by the invention has the advantages of high sintering tendency, high crystal compactness, low porosity (at most 10%), high compressive strength (at least 100 MPa), high thermal shock stability (at least 18 times by 1100 DEG C water cooling) and the like. The Cr2O3 content of the product isat most 6%, thereby reducing the Cr2O3 content in the brick, lowering the production cost and finally effectively reducing the environmental pollution of waste magnesium-chromium bricks after use.

The invention relates to a stemming, and especially relates to a stemming used in a non-blast-furnace taphole, wherein the non-blast-furnace taphole is used in molten iron smelting with a smelting reduction method. The stemming comprises: corundum 30-48 wt%, silicon carbide 7-20 wt%, a carbonaceous material 15-24wt%, sialon 10-20wt%, magnesium aluminate spinel 3-9wt%, kaolin 8-14 wt%, silicon-aluminum alloy 2-7wt%, and a tar and resin composite binding agent accounting for 16-24% of the total weight of the above materials. The stemming has good opening performance and mud-making performance. The stemming can resist erosion and corrosion of high-temperature high-pressure molten iron and slag. Especially, the stemming can resist corrosions of high-sulfur high-silicon molten iron and FeO-rich slag. When in use, a taphole depth is stable. The stemming is applied on a taphole of a smelting reduction furnace used in iron making.

The invention discloses a titanium carbide ceramic-enhanced visible arc self-shielded flux-cored wire for high-chromium cast iron, and the flux-cored wire provided by the invention comprises the following chemical components in percentage by weight (wt%): 60 to 70% of high-carbon ferrochrome, 1 to 2% of high-carbon ferromanganese, 1 to 3% of ferrosilicon, 1 to 3% of ferrovanadium, 1 to 3% of ferromolybdenum, 2 to 8% of TiC, 15 to 25% of graphite, and 1 to 2% of aluminum/magnesium powders; and the flux-cored wire has a low-carbon steel strip serving as an outer wrapper. The flux-cored wire is made by use of flux-cored wire production equipment which has a flux powder filling rate of 37%to 45%, and drawn by a wire drawing machine 2 to 5 times until the outside diameter of the flux-cored wire reaches the level F4. The flux-cored wire disclosed by the invention can be applied to overlay-welding under the conditions of no preheating before welding and no heat treatment after welding, and is very convenient in on-site use. By virtue of overlay-welding using the flux-cored wire disclosed by the invention, deposited metals have a high hardness up to HRC63-67 and better wear resistance andare not liable to stripping, and the service lives of large-sized high-chromium cast iron wear-resistant parts are 2 to 4 times those of integrally-machined parts.

Belonging to the technical field of refractory materials, the invention relates to taphole stemming used for oversize blast furnaces over 4500m<3>. The taphole stemming used for oversize blast furnaces comprises by weight: 25-50% of brown corundum, 5-20% of silicon carbide, 7-25% of ferro-silicon nitride, 15-30% of a composite carbon material, 5-15% of kaolin, 3-7% of composite refractory material micropowder, and 1-5% of composite metal powder. The stemming is prepared by the steps of: conducting weighing and burdening according to the above ratio of various raw materials, mixing them well and adding a coal tar binder accounting for 15-25% of the total weight of the additionally added dry materials, then conducting rolling and mulling so as to obtain a mud material. The stemming of the invention has good comprehensive performance, stable taphole depth, long tapping time, good erosion and scouring resistance, as well as good construction performance.

The invention discloses a manufacturing method of a novel rock wool material. The manufacturing method comprises the following steps: blending the following materials in parts by weight: 70-80 parts of basalt, 5-8 parts of limestone, 8-10 parts of slag, 20-30 parts of coke and 3-5 parts of auxiliary materials into a mixed raw material, placing into a cupola furnace, and fusing into magma at temperature lower than 900 DEG C; then forming a fiber, collecting wool, and paving the wool; then pressing on a three-dimensional wool presser, and solidifying and modifying to form the novel rock wool material. The rock wool material manufactured through the method disclosed by the invention has the advantages of uniformity in distribution, good hydrophobic effect and good mechanical property.

A heat transfer tube for an LNG vaporizer in which damage in the surface of the Al alloy substrate by corrosion is effectively prevented even when it is used in the lower portion of the panel or in the lower header where the surface is vigorously cooled and formation of the oxide coating is less likely to take place. This heat transfer tube is used in an LNG vaporizer equipped with an Al alloy panel unit including a panel composed of a plurality of heat transfer tubes arranged in a row in the form of a curtain, and a lower header and an upper header respectively connected to the panel at its lower end portion and its upper end port ion; wherein the LNG is vaporized by heat exchange between seawater flowing down along the surface of the panel from the upper end portion of the panel unit and the LNG flowing through theheattransfertubes. In this LNG vaporizer, the outer surface of the heat transfer tube at least in the lower end portion of the panel and the outer surface of the lower head are subjected to surface roughening by blasting, and then, a coating of an Al-Mg alloy containing Mg at a content in the range of 1 to 80% by mass, and having a thickness of 100 to 1000 m was formed by thermal spraying to realize protection by sacrificial corrosion. Formation as the corrosion protective of an A1 alloy coating containing Zn and/or Mn at a content in the range of 0.3 to 3.0% by mass with the proviso that the content of (Zn + Mn) is in the range of 0.3 to 3.0% by mass and containing Mg at a content in the range of 0. 3 to 5% by mass is also effective.

The invention relates to a light-weight corundum-magnesium aluminate spinel castable and a preparation method thereof. The technical scheme of the invention is taking nano-aperture porous corundum-magnesium aluminate spinel ceramic particles with the partical sizes successively being 3-5mm, 1-2.5mm and 0.1-0.5mm as aggregates, taking nano-aperture porous corundum-magnesium aluminate spinel ceramic fine powder with the partical size being smaller than 0.074mm, magnesium aluminate spinel fine powder, corundum fine powder, magnesia fine powder and alpha-Al2O3 micro powder as matrixes and taking aluminate cement as a binding agent; the preparation method comprises the following steps: mixing the matrixes, the binding agent and sodium hexametaphosphate firstly, then adding the aggregates, uniformly mixing, then adding water, uniformly stirring, moulding by casting, carrying out maintenance, demoulding and drying, and keeping the temperature for 2-6h at the condition with the temperature being 1450-1600 DEG C to obtain the light-weight corundum-magnesium aluminate spinel castable. By adopting the light-weight corundum-magnesium aluminate spinel castable and the preparation method, the process is simple, and a prepared product has the average pore size in a nanoscale, is low in heat conductivity coefficient, good in medium erosion and penetrability resistance and high in thermal shock resistance, and is suitable for parts, including bottoms, walls and the like, of steel ladles.

The invention discloses high-speed steel. The high-speed steel comprises the following components in percentage by weight: 1.0 to 2.0 percent of C, 0.3 to 1.0 percent of Si, 0.3 to 1.0 percent of Mn, 2.0 to 5.0 percent of Cr, 0.5 to 1.0 percent of Ni, 2.0 to 4.0 percent of Mo, 1.0 to 3.0 percent of V, 0.5 to 1.5 percent of W, and the balance of Fe. The invention also discloses an extrusion rollercontaining the high-speed steel and a production method of the extrusion roller. The high-speed steel disclosed by the invention has low cost and good abrasion resistance; and according to the extrusion roller containing the high-speed steel and the production method of the extrusion roller, the problems of a surfacing extrusion roller in the prior art are solved.

A spark plug including: a ground electrode including a thick portion provided on a base end side, a thin portion provided on a distal end side, and a stepped portion provided on an inner peripheral surface between the thick portion and the thin portion; a noble metal tip partially embedded in an inner peripheral surface of the thin portion; and a bulge portion provided on the inner peripheral surface of the thin portion between the stepped portion and the noble metal tip. When viewed from a side surface of the ground electrode, a relationship [a protruding height of the noble metal tip from the inner peripheral surface of the thin portion]≧[a protruding height of the bulge portion from the inner peripheral surface of the thin portion].