512results about How to "Improve anti-friction performance" patented technology

This invention discloses a method for preparing carbon nanotube-reinforced aluminum-based composite by vacuum hot pressing. The composite, comprising carbon nanotubes 0.1-5 wt.% and aluminum alloy powders 95-99.9 wt.%, is prepared by: (1) immersing carbon nanotubes in mixed acids, and adding surfactant; (2) dispersing; (3) filtrating, and washing carbon nanotubes with distilled water to neutrality; (4) performing two-step ball milling; (5) vacuum drying; (6) hot pressing in vacuum; and (7) hot extruding to obtain carbon nanotube-reinforced aluminum-based composite. This invention improves the capacity of aluminum alloy matrix in resisting abrasion, reducing friction, self-lubricating, surface wettability and mechanical properties.

The invention relates to alloy steel for braking discs. Chemical compositions of the alloy steel comprise in percentage by weight: 0.21 to 0.26 percent of carbon, 0.8 to 1.0 percent of silicon, 0.5 to 1.0 percent of manganese, 1.2 to 1.55 percent of chromium, 1.95 to 1.99 percent of nickel, 0.34 to 0.41 percent of molybdenum, 0.1 to 0.2 percent of vanadium, 0.05 to 0.06 percent of niobium, less than 0.01 percent of tungsten, less than 0.02 percent of titanium, less than 0.02 percent of aluminum, 0.05 to 0.09 percent of copper, 0.02 to 0.03 percent of zirconium, and the balance of Fe and unavoidable impurities. The alloy steel provided by the invention is steel for casting, has higher mechanical strength and thermal fatigue resistance, also has better thermal cracking resistance, stable friction property and good thermal conductivity at the same time, and is particularly suitable for producing the braking discs used for rail transit vehicles such as city rail transit vehicles, railway locomotive vehicles, motor vehicles, high-speed trains, and the like.

The invention relates to a boiling bed coal tar hydrotreating-hydrocracking composite catalyst and a preparation method thereof. The boiling bed coal tar hydrotreating-hydrocracking composite catalystis prepared from the following components in percentage by mass: MoO3, WO3, NiO, aluminum oxide, silicon oxide molecular sieve and assistant. An acidized silicon-containing raw material and alkali gas react with each other, and the reaction product is cured to generate microsphere gel which has higher scale-accommodating capability and proper cracking performance. Active metal nickel, the assistant and a carrier raw material are prepared into slurry, the NiO is highly dispersed on the catalyst carrier, and nickel aluminum spinel is formed by a small amount of nickel and aluminum, so that thewater resistance and friction resistance of the catalyst are enhanced. Spray drying is performed, so that the grain distribution is concentrated, and high mechanical strength and abrasion resistance are achieved. A curing agent is added into the slurry, and the channel of the catalyst is enlarged in the escaping process of ammonia gas released in a drying process, so that the channel distributionis concentrated, and larger pore volume, larger specific surface area and higher abrasion resistance are achieved. The boiling bed coal tar hydrotreating-hydrocracking composite catalyst has higher hydrogenation activity, proper cracking activity and higher stability. The preparation method is simple and is low in cost.

The invention relates to lubricating grease containing carbon nanotubes and a preparation method of the lubricating grease. The lubricating grease comprises bentonite as a thickening agent, refined mineral oil or synthetic oil as base oil, padding of carbon nanotube, and a polarity disperse assisting agent. The preparation method includes the steps of adding the carbon nanotubes treated in all base oil, adding organic bentonite for pre-dispersing, adding propylene carbonate as the polarity disperse assisting agent until a black uniform paste-structured lubricating grease is formed in a reactor, and finally obtaining the lubricating grease product. Compared with conventional bentonite lubricating grease, abrasion resistance performance of the lubricating grease containing carbon nanotubes is remarkably improved, and stability performance of high-temperature rubber bodies of the bentonite lubricating grease can be improved. A new application field is developed in nano lubricating materials for the carbon nanotube.

The invention discloses a multilayer composite coating of a zirconium alloy cladding surface, and a preparation method thereof. According to the method, a multi-arc ion plating technology is adopted,and zirconium alloy materials are used as a base; high purity nitrogen is used as reaction gas, and high purity argon is used as protective gas; the vacuum degree, arc current, temperature, depositiontime, gas flow and other parameters of a vacuum chamber are regulated; and a three-layer composite coating, using Cr as a transition layer, a CrTiSiN as a working coating and Cr as a protective coating, are formed on the surface of the zirconium alloy materials through deposition. The coating is uniform and compact, and the binding force between the coating and the zirconium alloy base is strong;the cladding integrity is ensured, and generation of hydrogen is inhibited; and hydrogen explosion is avoided. The coating is extremely high in hardness, and the friction resistance of zirconium alloy can be improved effectively; the a cladding pipe is prevented from being failed due to fretting wear, and the safety and accident tolerance of a reactor are improved.

The invention discloses a process method of a seamless sintering bimetallic lining, mainly comprising the following steps: 1 performing contamination and oxidation layer removing treatment on the surface of a steel plate; 2 preparing copper alloy powder; 3 sintering; 4 performing precision rolling on the sintered bimetallic material, pressing the material into a round shape, and carrying out welding forming, wherein the process comprises rolling, crimping, mouth milling, groove welding and shape reforming; 5 performing the de-stressing and shaping through heat treatment; and 6 manufacturing the seamless sintering bimetallic lining through the rough machining and finish machining. The seamless sintering bimetallic lining has the following technical advantages: 1 the hardness of the copper alloy layer of the bimetallic lining is higher, and the friction coefficient is reduced, thereby greatly enhancing the combination properties and the service life of the lining; 2 the seamless sintering bimetallic lining has no shape limitation in the manufacture process; 3 the seamless sintering bimetallic lining has no size limitation, and is suitable for being used in various loads and severe environment; and 4 the method of the invention has the significant characteristic of seamless sintering, thereby solving the problem that the seam exists in the process of sintering the bimetallic material, greatly enhancing the accuracy, the stability and the bearing capacity of the lining.

The invention relates to a micro-pit array-processing method based on laser impact effect, belonging to the technical field of laser processing. The method comprises the following steps: attaching anabsorption layer on the surface of a working piece to be processed; mounting the working piece on a worktable; applying a restraint layer on the absorption layer; and starting a laser to output a beamto impact the working piece so as to generate a plurality of impact points on the surface of the working piece to be processed and realize the laser impact processing of a micro-pit array. The methodadopts the high-energy short-pulse laser to act on an energy source and has simple, reliable and easily automated technological method and strong controllability of a technological process. Comparedwith a traditional laser-boning process, the technological method does not thermally influence the surface of the working piece, generates residential stress on the surface of the working piece, ensures and improves the abrasion-resistant performance of the working piece and is especially suitable for processing a micro-pit array on a friction secondary surface.

The invention discloses a ferrotitanium-based oily antifriction material. The ferrotitanium-based oily antifriction material comprises, by weight, 1.5%-5% of titanium hydride powder, 84.5%-97.1% of reduced iron powder, 1%-5% of copper powder, 0.2%-2.0% of graphite powder, 0.1%-1.5% of ferrophosphorus powder and 0.1%-2% of zinc stearate, and is made through the steps of powder mixing, pressing, sintering, oil-impregnated treatment and the like. Compared with the prior art, by adding the titanium hydride powder into the material, on one hand, the open porosity of the material is improved, more lubricating oil can be stored inside the material, a dynamic pressure oil film formed on the surface of a friction pair can be separated out favorably, and the function of supplementing lubrication is achieved; on the other hand, elementary substance titanium produced by decomposing titanium hydride is reacted with graphite to generate titanium carbide hard particles, so the wear-resisting property of the material is improved. The tribological property of the ferrum-based powder metallurgy material is obviously improved due to the addition of the titanium hydride, and the ferrotitanium-based oily antifriction material has the advantages of being low in cost and wide in application range.

The invention discloses a high-damping and high-performance alloy cylinder sleeve and a preparation technology thereof. The high-damping and high-performance alloy cylinder sleeve comprises a cylinder sleeve body and a zinc-aluminum high-damping alloy coating sprayed to the outer wall of a cylinder sleeve body. The thickness of the zinc-aluminum alloy coating is 0.3-1 mm. The cylinder sleeve body comprises, by weight, 3.2-3.5% of C, 2.8-3.3% of Si, 0-0.02% of P, 0-0.01% of S, 3.0-4.0% of Cu, 1.5-2.0% of Mn, 0.4-0.6% of Ni, 0.04-0.08% of Mg, 0.02-0.05% of Ce, and the balance Fe. The nodular cast iron cylinder sleeve obtained through the formula and preparation technology has high damping characteristics, vibration and noise of the engine cylinder sleeve can be effectively reduced, and a wearing surface on the inner wall of the cylinder sleeve has good wear resistance and anti-attrition performance, and the outer wall of the cylinder sleeves has the advantages of being high in strength, good in plasticity, good in corrosion resistance and anti-cavitation ability, short in run-in period with pistons and the like.

The invention discloses an aluminum-based material. Aluminum nitride, zirconium oxide and tantalum oxide particles are uniformly distributed in an aluminum alloy substrate, MoS2, Al2O3 and SiC are distributed on part of a surface layer of the aluminum alloy substrate, the hardness of aluminum nitride, zirconium oxide and tantalum oxide is high, the hardness and wear-resisting performance of the substrate are significantly improved, and fluorinated graphite powder can improve the anti-friction property. The surface of the substrate is coated with a Mn-Cr coating in a fusion mode to effectivelyimprove the wear-resisting performance and corrosion resistance of the alloy surface. The dispersion strengthening of strengthening phases of Si, Cu, Cr, Ni, Hf, Fe, Ag, Ca, Li, Ba and other elementsin the alloy improves the mechanical properties of the material. A preparation method enables mixed powder to be located in the center of a master alloy solution during casting through a method by adhering the mixed powder to a pure aluminum metal wire, the rapid diffusion and homogenization of micro powder particles is facilitated, the production efficiency is improved, wear-resistant materials are locally added by friction stir machining, and the material utilization ratio is improved.

The invention discloses an antifriction and antiwear lubricant oil additive containing nano tungsten disulfide, and belongs to the technical field of lubricant oil. The lubricant oil additive comprises the following components in percentage by weight: 0.5-15% of nano tungsten disulfide, 0.1-5% of a carbon nano additive, 1-20% of a surface modifier and 60-98.4% of basic lubricant oil. The lubricant oil additive disclosed by the invention can remarkably improve antifriction and antiwear performances of the basic lubricant oil, has relatively good dispersion stability in the basic lubricant oil, can be widely applied to lubricant grease of various vehicles and large-sized mechanical equipment, and can contain an extreme-pressure antiwear agent, an antioxidant, a purification dispersant, a corrosion inhibitor and the like.