37results about How to "Play a role in reducing friction" patented technology

The invention relates to a titanium alloy surface multi-element laser alloyed layer and a preparation method thereof. The preparation method comprises the following steps: by using titanium alloy as a base material, applying mixed powder of B4C, graphite, Ti powder and rare-earth oxides Y2O3 used as a coating material onto the titanium alloy surface, and carrying out laser scanning while blowing nitrogen gas to perform alloying, wherein the coating material comprises the following components in percentage by mass: 10-90% of B4C, 10-90% of graphite powder, 0-50% of Ti powder and 0-4% of Y2O3.In an open N2 environment, the B4C and graphite powder are subjected to boron-carbon-nitrogen multi-element composite laser alloying on the titanium alloy surface to prepare the high-hardness wear-resistant composite ceramic coating. The simultaneous addition of the Ti powder and rare-earth oxides Y2O3 is beneficial to enhancing the microhardness and wear resistance of the alloyed layer; and the proper amount of Ti can promote the in-situ reaction in the alloyed layer, and the Y2O3 can refine the structure, thereby enhancing the comprehensive mechanical properties of the coating.

The invention discloses a nanometer B4C modified antifriction wear-resisting laser cladding layer and a preparation method thereof, and aims to solve the problems that in the prior art, a laser cladding layer of titanium alloy is low in surface hardness and poor in wear resistance, and cracks and air holes are prone to appearing in the cladding layer. The prepared cladding layer has good wear resistance, and the problem that the cracks and the air holes appear in the cladding layer can be greatly alleviated. According to the technical scheme, the preparation method comprises the following steps that the titanium alloy is taken to be a base material, ni-based self-fluxing alloy powder and nanometer B4C are taken as cladding materials, and the nanometer B4C modified antifriction wear-resisting laser cladding layer is prepared through laser cladding.

The invention relates to a carbon-based composite material for a sliding block of a current collector. The carbon-based composite material is characterized by using a mixture of 15 to 30 mass percent of graphite and 20 to 30 mass percent of active carbon as a matrix, using 15 to 35 mass percent of copper powder as a conductive component, using 10 to 20 mass percent of solid phenolic resin as a binder and using a mixture of 1 to 6 mass percent of silicon powder, 1 to 6 mass percent of glass powder, 1 to 6 mass percent of aluminium oxide powder, 2 to 8 mass percent of aluminium powder, 2 to 8 mass percent of tin powder, 1 to 2 mass percent of cobalt powder and 1 to 2 mass percent of molybdenum disulfide as a modifier. The carbon-based composite material has a metal conductive network structure and can effectively improve conductivity; the graphite serves as the matrix and has antifriction effect, so the prepared sliding block material has small friction coefficient; and the modified components can improve the interface combination of a metal matrix and a carbon matrix and improve the mechanical property of the carbon-based sliding block material.

The invention discloses a method for spraying the inner aperture wall with a novel plasma cored wire. The method comprises the following steps: 1, preprocessing the surface of a workpiece; 2, selecting an iron-based cored wire containing an antifriction wear-resistant powder core added with molybdenum (Mo), chromium (Cr), nickel (Ni), boron (B), silicon (Si), and iron (Fe) components and a stainless steel shell, and spraying the iron-based cored wire on the small inner aperture surface of the workpiece through a plasma transferred wire arc (PTWA) spraying technology to obtain a wear resistant coating; and 3, carrying out honing processing on the prepared wear resistant coating. The wear resistant coating prepared through the method of the invention has the advantages of high strength of the combination with a matrix, difficult shedding, hardness higher than the hardness of traditional cast iron liners, substantially improved wear resistance, realization of the oil storage function of 1-5% of apertures formed through the coating technology, lubrication promotion to reduce antifriction, and the like, so problems of weight and dimension increase of the cast iron liner of an aluminum alloy engine cylinder and problems of oil consumption and discharge increase caused by the thermal expansion of the inner wall of the cylinder are solved.