33results about How to "Good anti-wear properties" patented technology

The present invention relates to iron base composite MoS2 plating solution for brush plating and its preparation process. The composite plating solution consists of FeSO4 270-330 g / L, MoS2 36-44 g / L, polyoxyethylene alkylphenol ether 1.5-2 g / L and polyglycol 1.5-2 g / L, and has pH value of 1.5-2.0. The preparation process includes the technological steps of: dissolving MoS2 grain in absolute ethanol, adding polyoxyethylene alkylphenol ether as non-ionic surfactant while intense stirring, adding proper main salt and polyglycol while stirring, and setting non-woven fabric bag holding iron powder in 1 g / L inside the plating solution. The present invention has stable iron solution and homogeneously dispersed MoS2, and the plating solution may be used in forming excellent coating.

The invention discloses a preparation method of a resin based powder metallurgy composite friction material for vehicles, wherein the preparation method comprises the following steps: 1) preparing a powder metallurgy friction material: mixing evenly a base material and a forming agent, pouring the mixture into a mold, pressing to slender rods, separating the slender rod-shaped pressed blanks, and sintering, to obtain a powder metallurgy friction material; 2) shearing, crushing and screening; 3) mixing: according to the mass percentage, evenly co-mixing 10-20% of high-temperature-resistant modified resin, 40-60% of the powder metallurgy friction material, 10-20% of a reinforcing fiber, 5-15% of an abrasive, 10-20% of a lubricating material and 5-20% of a filler; 4) producing and preparing a resin based composite friction material; 5) post-treating; and 6) carrying out mechanical processing. The resin based powder metallurgy composite friction material retains the stable friction coefficient and good anti-abrasion properties of the powder metallurgy friction material. The service life and the high-temperature stability of the friction material are improved.

The invention discloses an automotive iron-based powder metallurgy composite frictional material and a manufacturing method thereof. The manufacturing method includes that firstly, a basis powder material is mixed with a molding agent uniformly to obtain a mixture, the mixture is poured into a mold and is shaped into slender rods by pressing, the slender rods are compacted and separated and then charged into a sintering furnace, and the sintering furnace is heated up under protection of nitrogen gas or hydrogen gas so that an iron-based powder metallurgy friction material is obtained; secondly, the iron-based powder metallurgy friction material is subjected to processes of shearing, grinding and screening; thirdly, by mass percent, 10-20% of cashew nut oil modified phenolic resin, 30-60% of the iron-based powder metallurgy friction material, 10-20% of reinforced fibers, 5-15% of abrasives, 10-20% of lubricants and 5-20% of fillers are mixed uniformly to obtain a powder mixture, and the powder mixture is then subjected to hot press molding, is preserved at the temperature of 150-180 DEG C, cooled to the room temperature and then discharged from the furnace. The automotive iron-based powder metallurgy composite frictional material remains the stable friction coefficient and good abrasive resistance of the conventional powder metallurgy friction material, service life of the friction material is prolonged and its high-temperature stability is also improved.

The invention discloses an anti-wear fin tube and a heat exchanger, wherein the anti-wear fin tube includes a base tube and fins arranged on the outer surface of the base tube, and is characterized in that: There is a drainage groove with an upper end opening on the surface, the height of the drainage groove is 1 / 2 to 4 / 5 of the fin height, and the width of the drainage groove is 1 / 6~1 / 4 of the diameter of the base pipe; the fins are Parallel fins or helical fins arranged at intervals. Compared with the prior art, the present invention has little effect on the extended surface area of ​​the finned tube by slotting the fins on the upstream side of the spiral or circular finned tube, and retains the advantage of the large heat exchange area of ​​the finned tube. By adjusting the height and width of the drainage groove, the wear of traditional spiral finned tubes or circular finned tubes can be effectively improved, and the wear resistance is better than that of H-shaped finned tubes. At the same time, because the fins of the present invention are arc-shaped, the anti-wear performance of the fins is more obvious than that of the H-shaped fin tube.