325 results about "Sintered alloy" patented technology

A bearing for a motorized fuel pump is made of a Cu—Ni based sintered alloy, composed of: 21 to 35% by mass of Ni, 5 to 12% by mass of Sn, 3 to 7% by mass of C, 0.1 to 0.8% by mass of P, and the balance of Cu and inevitable impurities. A matrix of the bearing is formed with pores with a porosity of 8 to 18%, and the P component is predominantly included at the grain boundary, and free graphite is distributed along the insides of open pores that are open to the surface and extending into the bearing. In this bearing, a Sn rich alloy layer containing equal to or more than 50% by mass of Sn is formed on the insides of the open pores and near openings of the open pores.

The invention discloses a hard alloy mold material for a fastener formed through cold upsetting and a preparation method of the hard alloy mold material. The hard alloy mold material comprises 72.4%-77% of WC, 22%-25% of Co, 0.5%-0.8% of Ni, 0.3%-0.8% of Cr3C2 and 0.2%-1% of WC-TiC-NbC solid solution. The technique of the hard alloy mold material comprises the steps that WC, Co, Ni, Cr3C2 and the WC-TiC-NbC solid solution are placed in a ball mill, wet milling media, forming agents and additives are added under the matching of wet milling balls and mixtures, and ball milling is conducted; slurry obtained after wet milling is dried by means of a spray tower for granulation; dried alloy powder is subjected to press-forming and placed in a low-pressure sintering furnace for heat preservation, and a sintered alloy product is obtained after the sintering furnace is cooled to the indoor temperature; and the sintered alloy liquid nitrogen is subjected to subzero treatment, and finally, low-temperature tempering treatment is conducted. The hard alloy mold material has the advantages of being resistant to abrasion, oxidation and corrosion, high in strength, long in service life and the like.