31results about How to "Small dilution" patented technology

The invention belongs to the technical field of surface laser cladding of refractory metal, in particular to a method for preparing a MoSi2 (molybdenum disilicide) coating layer by surface laser cladding of molybdenum alloy. The method comprises the following steps of firstly, sputtering an Si (silicon) thin layer with thickness of 20 to 30mum at the surface of molybdenum alloy; then, presetting acarbon nitride alloy powder; combining the molybdenum alloy, the sputtered Si thin layer and the preset carbon nitride alloy powder together by laser scanning, so as to obtain the MoSi2 coating layerwith excellent mechanical property and good combining property with molybdenum alloy. The prepared MoSi2 coating layer at the surface of the molybdenum alloy has the advantages that by adopting the magnetron sputtering Si thin layer, and utilizing the laser cladding technology, the Mo-Si element transition layer can be formed, and the bonding strength between the molybdenum alloy and the MoSi2 coating layer is improved; the carbide coating layer is prepared at the surface of the molybdenum alloy sputtered with the Si thin layer, the tissues of the coating layer are uniform and dense, and thecombining is good; under the multi-element alloying function, the service property of the coating layer can be improved.

The invention aims to provide a method for carrying out liquid metal corrosion treatment on the surface of martensitic heat-resistant steel. The method comprises the following steps: after prearranging a layer of aluminum on a metal surface by virtue of electric arc ion plating, processing by using a laser cladding process, and controlling the surface aluminum activity to form compact and stable aluminum oxide. Therefore, the liquid metal corrosion resistance of metal is effectively improved, and the service life of the metal material is prolonged.

The invention discloses a manufacturing method of a wear-resistant alloy coating of an automobile brake disc. The manufacturing method of the wear-resistant alloy coating of the automobile brake disccomprises the following raw materials: 25%-70% of tungsten carbide, 15%-70% of chromium carbide and a brake disc base material, and hypersonic flame is utilized. Through axially feeding powder to theflame, spraying particles can be heated to a molten or semi-molten state and accelerated to be up to 300-500 m/s, so that the compact high-quality coating with high bonding strength is obtained. The hypersonic flame speed is very high, but the temperature is relatively low and is about 3000 DEG C. For WC-Co series hard alloys, decomposition of WC in the spraying process can be effectively inhibited, and the coating is high in bonding strength and compact. The wear resistance is excellent, greatly exceeds that of a plasma spraying layer, is equivalent to that of an explosion spraying layer, andalso exceeds that of an electroplated hard chromium layer and a spray melting layer. The surface hardness is increased and can reach HV900-1200. The temperature resistance can reach 600-900 DEG C, the emission of brake dust is reduced by 90%, and the effect of no rusting can be achieved forever.

The invention belongs to the technical field of the remanufacturing of refractory metals, and particularly relates to a preparation method of a surface silicide coating for a TZM (Titanium-Zirconium-Molybdenum) alloy sheet. A pure Al element layer with a thickness of 10 mum to 20 mum is sputtered on the surface of the TZM alloy sheet; and next, the TZM alloy sheet, the pure Al element layer and aMoSi2 powder coating are combined together through laser scanning, so as to obtain the silicide coating which is excellent in mechanical property and is further favorably combined with the TZM alloy sheet. The preparation method has the beneficial effects that the sputtered pure Al element layer in the preparation method is subjected to segregation between interfaces of the TZM alloy and the MoSi2coating; the combining power between the TZM alloy sheet and the MoSi2 coating can be improved; the exfoliation of the MoSi2 coating is reduced; on the other hand, the MoSi2 alloy coating is preparedon the TZM alloy sheet in a fusion covering manner by adopting lower laser power of 1.0 kW to 1.5 kW; the massive dissolution on the matrix TZM alloy can be avoided; and the overall performance of the MoSi2 coating is improved.

A process for the regeneration of an acid gas absorbent comprising an amine and heat stable salts by phase separation, comprising a) mixing the acid gas absorbent with an alkaline solution, to form a mixture with a pH above the pH equivalence point of the amine; b) cooling the mixture to a temperature below 500 C; c) separating the mixture into a regenerated acid gas absorbent and a waste stream; d) collecting the regenerated acid gas absorbent separate from the waste stream.

The invention provides a method for melt deposition of a composite cladding layer through double-cylinder synchronous powder feeding based on 30CrMnSiA steel. The method includes the steps that alloypowder which comprises 316 austenitic stainless steel metal spherical powder and WC metal spherical powder is selected; a to-be-cladded workpiece is preheated, wherein the preheating temperature is 500-690 DEG C; and laser cladding process parameters are set, laser cladding is conducted on the surface of the to-be-cladded workpiece, and the composite cladding layer is formed. According to the method, a high-energy density laser beam with better directivity, coherence and brightness is input as energy, so that rapid cooling and rapid heating in the whole processing process are realized, and micro-metallurgical cladding modification is realized on a 30CrMnSiA steel base material.

The present invention relates to a kind of method for removing carbonate in cyanide silver-plating bath solution, comprises a, confirms carbonate content: takes cyanide silver-plating bath solution, analyzes and determines wherein carbonate content; B, confirms precipitation agent adding Quantity: Calculate and prepare the carbonate precipitant that needs to be added according to the carbonate content in the cyanide silver plating bath; c. Carbonate precipitation: add the carbonate precipitant to the cyanide silver plating bath , stirred, allowed to stand, precipitated, filtered, and the filtrate was obtained. The invention has the advantages of high carbonate removal efficiency in cyanide silver plating bath liquid, short reaction time, more complete reaction and less potential safety hazard.

The invention discloses a high-precision venous drainage device. The device comprises an external panel, a negative pressure source access port, a pressure regulating airway, a negative pressure outlet, an airway control switch and a visible pressure display device; the pressure regulating airway can control the negative pressure in a high-precision mode; the pressure regulating airway then adjusts and controls the pressure through formed specific vortexes; the device has the positive and negative pressure protection function, that is, positive pressure protection and high negative pressure protection are provided, and risks in the use process are prevented. By means of the device, the venous blood drainage amount can be increased only by loading a stable negative pressure source to a closed blood storage device, and the method is simple and convenient to use. Except that small venous cannulas can be used and tissue injury is reduced, the pipeline of a cardiopulmonary bypass device (CPB) can be miniaturized, the priming volume of the CPB is thus reduced, the blood dilution degree is significantly reduced, and the platelet consumption is reduced.

The invention relates to a high-load gear hard surface carburized layer repairing technology, in particular to alloy powder and a method for repairing a hard surface of a heavy-duty gear by using the alloy powder. The alloy powder is prepared from the following raw materials: JY-F-1, JY-F-2 and JY-F-3, wherein the raw material ratio of the JY-F-1 to the JY-F-2 to the JY-F-3 is 1:1:1. The method for repairing the hard surface of the heavy-duty gear through the alloy powder comprises the following steps of S1, clamp repairing, S2, CMD welding, S3, laser welding, S4, heat treatment and S5, result detection. The method for repairing the hard surface of the heavy-duty gear has the characteristics of being short in repairing time, large in welding thickness, small in workpiece deformation, good in fusion performance, high in welding quality, easy to implement and the like. In addition, the method for repairing the hard surface of the heavy-duty gear can be used for effectively repairing a carburized layer of the hard surface of the heavy-duty gear to reach and be close to the hardness, the wear resistance and the pressure resistance of a hard surface body of the gear.