39results about How to "Reduce dry friction coefficient" patented technology

A wiper blade for a windshield wiper, in particular for a windshield wiper of a motor vehicle, is proposed, which has a wiper blade rubber with a wiper blade rubber lip (2). In order to achieve a low dry friction coefficient, the wiper blade rubber lip (2) is fabricated partially of polyethylene.

The invention relates to zirconium micro-alloyed nickel-aluminum bronze and a preparation method thereof. The zirconium micro-alloyed nickel-aluminum bronze is characterized in that the alloy mainly comprises nickel-aluminum bronze and zirconium (Zr) with mass percentage of 0.03 to 0.1%. The preparation process flow of alloy comprises the following steps of: firstly, after melting the nickel-aluminum bronze, and then adding Al-Zr intermediate alloy; after completely melting, adding a deslagging agent, and then introducing a high-purity nitrogen gas to refine for 3min; and finally, pouring into a ladle, keeping stand and keeping the temperature for 1-5min, deslagging and casting into ingots. Compared with the conventional nickel-aluminum bronze, the alloy provided by the invention has a fine microstructure, the hardness is increased by 8.1%, the uniform corrosion rate in 3.5% NaCl solution is reduced to 5.3%, and the coefficient of friction is obviously reduced; and the alloy has wide application prospects in fields such as marine ship propellers, seawater pumps, marine oil platforms, seawater piping systems, mechanical molds and bearings, bushings and turbines which work at high speed, high pressure and high temperature.

The invention discloses Sc-Zr-Sr compounded micro-alloyed high manganic aluminum bronze, which is characterized by mainly comprising the following components in percentage by mass: 0.015-0.058% of Sc, 0.028-0.074% of Zr, 0.012-0.057% of Sr and the balance of high manganic aluminum bronze, wherein the sum of mass percentages of all the components is 100%. The preparation process of the alloy comprises the following steps of: firstly, melting the high manganic aluminum bronze, and sequentially adding an Al-Sr intermediate alloy, an Al-Zr intermediate alloy and pure Sc; then, adding a slag cleaning agent for removing impurities after completely melting the added materials, and feeding high-purity nitrogen for refinement; and finally, pouring into a casting ladle, removing slag after standing, and casting to form ingots. Compared with the conventional high manganic aluminum bronze, the Sc-Zr-Sr compounded micro-alloyed high manganic aluminum bronze is fine and compact in structure, has the hardness which is increased by 46.3%, the uniform corrosion rate in a 3.5% NaCl solution is reduced by 8%, and the friction coefficient is reduced significantly. The Sc-Zr-Sr compounded micro-alloyed high manganic aluminum bronze effectively makes up the defect of insufficient performance of the existing high manganic aluminum bronze on the market, and can meet the requirements on high-performance high manganic aluminum bronze of the rapid development in fields including propellers, seawater pumps, valves, seawater desalination equipment and the like for large ships in our country.

The invention relates to the technical field of electroplating, and particularly relates to a preparation method of a nickel-polytetrafluoroethylene coating. According to the invention, nickel is combined with polytetrafluoroethylene, a fluorinated ethylene-propylene copolymer, a perfluoroalkoxy copolymer and other assistants to be used as an electroplating solution and used for electroplating under certain conditions. The invention can be widely applied to various base materials such as steel, copper alloys, wrought aluminum, cast iron, stainless steel and the like, and can be also perfectly used on various injection molding materials except pure rubber, such as silica gel, TPO0, PVC (polyvinyl chloride) and the like. The coating is favorable in wear resistance and non-corrosibility, has weldability and hardenability, and causes no negative effect on the surfaces of other molds.

The invention discloses a surface fatigue-resistant treatment process for a rotating bearing. The surface fatigue-resistant treatment process for the rotating bearing includes the first step of cleaning, the second step of primary pre-heating, the third step of primary salt bath nitriding, the fourth step of cleaning, the fifth step of primary carburizing treatment, the sixth step of secondary pre-heating, the seventh step of polishing, the eighth step of primary salt bath oxidizing, the ninth step of secondary carburizing treatment, the tenth step of secondary salt bath oxidizing and the eleventh step of rinsing. In the treatment process, salt bath nitriding is performed firstly, then crossed carburizing and salt bath oxidizing treatment is performed, the microhardness of the surface of a rotating bearing cladding layer is highest, the cladding layer is uniform in thickness, uniform in distribution, compact and complete, the combining capacity of the cladding layer and a base material is high, the salt corrosion resistance and the stress corrosion breakage resistance can be further improved, by using the rotating bearing treated through the process, the rotating bearing is stable in size and small in high temperature deformation, the surface hardness reaches HV2500 or above, the dry friction coefficient is reduced to 0.08-0.1, the abrasion resistance is improved by 450%, the fatigue service of the rotating bearing is 10-12 times that of conventional heat treatment, and the comprehensive performance meets the using requirement of an extremely severe environment.

The invention provides strontium, titanium and boron composite microalloying manganese brass which is mainly prepared from the following components in percentage by weight: 0.01 to 0.03% of strontium (Sr), 0.01 to 0.05% of titanium (Ti), 0.002 to 0.008% of boron (B), and the balance of the manganese brass, wherein sum of mass percentage of the components is of 100%. The preparation method of an alloy comprises the technical processes as follows: melting the manganese brass; adding an Al-Sr intermediate alloy and an Al-Ti-B intermediate alloy in sequence, wherein materials are added based on specified sequence, which means that a following intermediate alloy just can be added after a previous intermediate alloy is melted; transferring into a casting ladle after the ally is completely molten; standing; removing slag; and casting to obtain an ingot, thus obtaining the strontium, titanium and boron composite microalloying manganese brass. Compared with a conventional manganese brass, the strontium, titanium and boron composite microalloying manganese brass provided by the invention has the advantages that texture is small, hardness is improved by 21.6%, an uniform corrosion speed in 3.5% of NaCl solution is reduced by 9.9%, and a frictional coefficient is greatly reduced.

The invention discloses a steel ring car wheel surface treatment process. The steel ring car wheel surface treatment process comprises the following steps of (1) cleaning, (2) surface preheating, (3) surface modification treatment, (4) cleaning and cold standing and (5) quenching treatment. The steel ring car wheel surface treated through the process has the high abrasion resistance, high hardness, high toughness and high shock resistance, subsequent quenching treatment is matched, the optimal quenching time and quenching temperature are optimized, and the tempering time and tempering temperature are adjusted, so that the impact toughness and hardness of a steel ring car wheel are improved; and inner hardness and outer hardness are balanced, the microhardness of the surface of a steel ring car wheel coating is quite high, the salt corrosion resistance and stress corrosion cracking resistance can be further improved. In addition, the fatigue resistance of the steel ring car wheel is greatly improved, the service life of the steel ring car wheel is prolonged, and the service life of the steel ring car wheel is prolonged by three to four times compared with untreated steel ring car wheels.

The invention provides a wolframium (W) doped diamond-like coating and a preparation method thereof. The coating comprises a Cr bottom layer, a CrC transition layer and a W doped diamond-like layer, wherein the Cr bottom layer is deposited on the surface of a substrate, the CrC transition layer is prepared on the Cr bottom layer, and the W doped diamond-like layer is prepared on the CrC transition layer. The preparation method comprises the following steps: firstly carrying out plasma cleaning on the substrate, opening a column electric arc Cr target to prepare the Cr bottom layer on the surface of the substrate, opening a plane magnetron sputtering C target to prepare the CrC transition layer on the Cr bottom layer, and finally closing the column electric arc Cr target and opening a plane magnetron sputtering W target to prepare the W doped diamond-like layer on the CrC transition layer. According to the preparation method provided by the invention, the electric arc and magnetron sputtering composite coating technology is adopted, so that the prepared coating is smooth and compact in surface, high in hardness, high in film bonding strength, low in friction coefficient and good in oxidization resistance and chemical stability, and can meet relatively high requirements for oxidization resistance, wear resistance and antifriction performance, therefore the coating has wide application prospects.

The invention discloses a method of preparing biology activity composite thin film on surface of titanium alloy. Specifically, the titanium alloy which is processed before the convention is placed in a multi-sphere ion plating-magnetic control sputtering composite gas phase sedimentation vacuum system. A data link control (DLC) thin film with Ti as a transition layer is sedimentated. The composite thin film is composed of a titanium alloy base body, the DCL thin film and a casein phosphoric acid peptide activity egg white surface layer in sequence. A series of excellent qualities of the titanium alloy as the base body material are maintained by the thin film. The biology activity and the tribology performance are improved.

The invention discloses a fork truck steel ring surface treatment process, which comprises the following steps of (1) cleaning; (2) acid washing; (3) surface preheating; (4) surface deterioration treatment; (5) cleaning and cold placement; (6) quenching treatment; (7) surface treatment agent treatment. When being used for treating the surface of a fork truck steel ring, the fork truck steel ring surface treatment process has the advantages that the wear resistant performance is good; the hardness is high; the toughness is high; the anti-impact performance is high; the subsequent quenching treatment is matched; the best quenching time and quenching temperature are optimized; the tempering time and the tempering temperature are regulated, so that the impact toughness and hardness of the fork truck steel ring are improved; in addition, the inner hardness and the outer hardness are balanced; the micro hardness of the surface of the coating layer of the fork truck steel ring is very high; the slat corrosion resistance and the stress corrosion cracking resistant performance can be further improved; in addition, the anti-fatigue intensity of the fork truck steel ring is greatly improved; the service life is prolonged, and is prolonged by 3 to 4 times through being compared with the service life of the untreated fork truck steel ring.

The invention discloses a semi-solid die-casting and double fluorination joint manufacturing method of a magnesium alloy building formwork, comprising the following steps: step 1, preparing a magnesium alloy building formwork by using a semi-solid die-casting method; step 2, using the magnesium alloy building formwork prepared in step 1 Immerse in the double fluoride treatment solution to carry out double fluoride combined treatment to obtain a double fluoride combined treated magnesium alloy building formwork. The magnesium alloy formwork plate produced by the present invention is flat and free of defects, has high tensile strength, high elongation, high surface hardness, small friction coefficient, excellent scratch resistance and hydrophobicity, and can effectively reduce the risk of concrete aggregates. The friction damage and corrosion damage from the external erosive medium prevent the chemical reaction and physical adsorption caused by cement, and ensure the construction quality and demoulding effect of the building wall.

The invention relates to a lubricating oil additive containing ultrafine rare-earth powder. The additive consists of the following components in percentage by mass: natural serpentine mineral powder, ultrafine rare-earth powder, surfactant, a dispersing agent, a friction modifier, an auxiliary and base oil, wherein the ultrafine rare-earth powder is one of cerium hydroxide, neodymium oxide and cerium fluoride; the surfactant is borate, span-60 or oleic acid; the dispersing agent is either polyisobutene dibutyl succinimide or high molecular weight polyisobutene dibutyl succinimide; the friction modifier is one of melamine cyanurate, boron nitride and calciuym nitride; the auxiliary comprises 72% of dialkyl disulfo oxygen molybdenum phosphate sulfide, 18% of polymethyl tetradecyl acrylate and 10% of a vinyl-propylene copolymer; and the base oil is 500SN base oil. The additive has obvious corrosion resistance; and after an engine is treated technically by using the self-repairing additive, the dry friction coefficient of the machine is reduced from original 0.05 to be less than 0.005 and therefore the surface abrasion is reduced.

The invention discloses lifting type charging tray feeding and discharging equipment. The lifting type charging tray feeding and discharging equipment comprises an empty charging tray lifting mechanism, a discharge lifting mechanism and a moving mechanism. The empty charging tray lifting mechanism and the discharge lifting mechanism each comprise a lifting motor, a lead screw, a supporting plate and a guiding device, wherein the lead screw is connected with the lifting motor and vertically arranged; the supporting plate is in threaded connection with the lead screw and horizontally arranged; the guiding device is used for guiding ascending and descending of the supporting plate; a charging tray is borne by the supporting plate. The moving mechanism comprises a cross beam, a moving cylinder mounted on the cross beam and an unloading mechanism mounted on a piston of the moving cylinder. The moving cylinder drives the unloading mechanism to horizontally move between the empty charging tray lifting mechanism and the discharge lifting mechanism. According to the technical scheme, the lifting type charging tray feeding and discharging equipment has the beneficial effects that multiple empty charging trays can be placed at a time, and labor and time are saved; the charging trays can be taken at a time when all fully loaded with materials in the material taking process, and labor and time are saved.

The invention discloses an Mg-Sr-Ti-B composite micro-alloyed manganese brass and a preparation method thereof. The Mg-Sr-Ti-B composite micro-alloyed manganese brass is characterized by comprising 0.05 to 0.1% by mass of Mg, 0.005 to 0.03% by mass of Sr, 0.008 to 0.05% by mass of Ti, 0.002 to 0.0075% by mass of B and the balance manganese brass. The preparation method comprises the following steps of melting manganese brass, orderly adding an Al-Sr intermediate alloy, an Al-Ti-B intermediate alloy and pure Mg into the melted manganese brass, after full melting, pouring the fully-melted mixture into a casting ladle, standing, removing dregs, and carrying out casting to obtain a cast ingot of the Mg-Sr-Ti-B composite micro-alloyed manganese brass. Compared with the conventional manganese brass, the Mg-Sr-Ti-B composite micro-alloyed manganese brass has a fine microstructure, hardness improved by 11.6%, a uniform corrosion rate reduced by 7.6% in a NaCl solution having a concentration of 3.5%, and a friction coefficient greatly reduced.

The invention belongs to the technical field of composite materials and discloses a low-friction water lubricating macromolecular bearing composite material which is characterized by comprising ultra-high molecular weight polyethylene, polystyrene-ethylene-butylene triblock copolymer, polyvinyl alcohol, graphite and molybdenum disulfide, wherein each 100 parts of ultra-high molecular weight polyethylene is blended with 10-40 parts of polystyrene-ethylene-butylene triblock copolymer, 2-5 parts of polyvinyl alcohol, 2-10 parts of graphite and 1-5 parts of molybdenum disulfide. The low-friction water lubricating macromolecular bearing composite material provided by the invention is formed by adopting an effective material blending scheme.